KR101659898B1 - Projector having a photodetector - Google Patents

Projector having a photodetector Download PDF

Info

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
Authority
KR
South Korea
Prior art keywords
light
optical system
illumination
relay lens
image
Prior art date
Application number
KR1020150172298A
Other languages
Korean (ko)
Inventor
김진호
홍승기
홍준표
김동근
남세영
Original Assignee
주식회사 세코닉스
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 세코닉스 filed Critical 주식회사 세코닉스
Priority to KR1020150172298A priority Critical patent/KR101659898B1/en
Application granted granted Critical
Publication of KR101659898B1 publication Critical patent/KR101659898B1/en

Links

Images

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

PROJECTOR HAVING A PHOTODETECTOR < RTI ID = 0.0 >

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector for enlarging and projecting a generated image to a screen or the like, and more particularly to a projector including a light detector capable of detecting illumination light transmitted from an illumination optical system in an projector to an image element.

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 optical system 10 of a conventional projector as shown in Fig. 1 comprises an illumination optical system 11 configured to provide light to a projector, Two pieces of TIRs for causing the light incident from the illumination optical system 11 to enter the DMD panel or the LCD panel into the same image element 13 and the light reflected from the image element 13 to enter the projection optical system 14, A reflecting structure made up of prisms 12a and 12b and a projection optical system 14 for projecting the light transmitted through the reflective structures 12a and 12b onto the screen 15. [

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 light beam detector 15 such as a photodiode is further disposed in the optical path from the illumination optical system 11 to the image sensor for improving the image quality. The light detector 15 receives the illumination light from the illumination optical system 11 and analyzes the received illumination light to measure the illuminance of a plurality of light sources constituting the illumination optical system 11, for example, a red LED, a blue LED, (Not shown) in the projector, and the controller compares the illuminance value of each measured LED with a reference value to increase or decrease the current or voltage to the LED to increase or decrease the brightness of the LED Adjust automatically.

However, in this case, the light detector 15 must be located in the incident path of the illumination light along the optical axis of the illumination optical system 11 or the projection path of the projection light along the optical axis of the projection optical system 14, as shown in Fig. The light beam detector 15 causes a problem that it must be accurately positioned so as not to disturb the image to be projected.

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 light beam detector 15 outside the optical axis of an illumination optical system .

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 projector 10 according to the present invention includes an illumination optical system 100 configured to provide illumination light, an illumination optical system 100 that causes the illumination light incident from the illumination optical system 100 to enter the image element 300, (Not shown) for projecting the image light from the image element 300 to a front screen (not shown), and a projection optical system 400 for projecting the image light from the image element 300 to a front screen (500) for receiving the illumination light from the illumination optical system (100), an illumination control unit (400) for receiving the illuminance of the illumination light, which is electrically connected to the light searing user (500) And a control unit for controlling the illuminance of the LEDs constituting the illumination optical system.

Hereinafter, the illumination optical system 100 includes at least three light sources, i.e., a red LED 111, a green LED 112, and a blue LED 113, in order to generate illumination light necessary for image generation from the projector. 3, the red LED 111 and the blue LED 113 are arranged such that their respective optical axes are perpendicular to the optical axis Z1 of the illumination optical system, and the green LED 112 has its optical axis aligned with the optical axis of the illumination optical system (Z1).

In front of each of the three LEDs 111, 112 and 113, collimation lens units 121, 122 and 123 for converging light emitted from the LEDs are disposed. Each of the collimation lens units 121, 122, and 123 collimates the illumination light emitted from each of the three LEDs to the dichroic filter unit 130 located at the rear end of the optical path.

The dichroic filter unit 130 is composed of at least two dichroic mirrors, for example, a first dichroic mirror 131 and a second dichroic mirror 132. The first dichroic mirror 131 and the second dichroic mirror 132 are arranged so as to intersect with each other. The first dichroic mirror 131 reflects the red light R, (B). The second dichroic mirror 132 disposed to intersect with the first dichroic mirror 131 is configured to reflect the blue light B and transmit the red light R and the green light G. [

According to the dichroic filter unit 130, a part of the light emitted from the red LED 111 is reflected by the first dichroic mirror 131 and then transmitted through the second dichroic mirror 132 And the remaining part of the light is transmitted through the second dichroic mirror 132 and then reflected by the first dichroic mirror 131 to be incident on the rear side of the illumination optical system 100 along the optical axis Z1 of the illumination optical system 100, And is incident on the rear end along the optical axis Z1.

On the other hand, the light emitted from the green LED 112 passes through the first dichroic mirror 131 and the second dichroic mirror 132, is incident on the rear end along the optical axis Z1 of the illumination optical system 100, 2 dichroic mirror 132 and the first dichroic mirror 131 and is incident on the rear end along the optical axis Z1 of the illumination optical system 100. [

A part of the light emitted from the blue LED 113 is reflected by the second dichroic mirror 132 and then transmitted through the first dichroic mirror 131 and is reflected along the optical axis Z1 of the illumination optical system 100 And the remaining part of the light is transmitted through the first dichroic mirror 131, reflected by the second dichroic mirror 132, and incident on the rear end along the optical axis Z1 of the illumination optical system 100. [

As described above, the illumination light emitted to the red LED 111, the green LED 112, and the blue LED 113 is synthesized through the dichroic filter unit 130, And is incident on the eye lens 140. The fly-eye lens 140 is formed of a plurality of microlens arrays and uniformizes illumination of the illumination light emitted from the plurality of LEDs. The microlenses of the fly-eye lens 140 are also configured to have a rectangular shape to provide a square-shaped light profile on a square mirror of a DMD used as an image element.

Next, the illumination light having a quadrangle-shaped optical profile passed through the fly-eye lens 140 passes through a relay lens positioned at the rear end of the optical path, and is incident on the optical path changing unit 200.

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 single relay lens 210 and a single triangular prism 220 having a total reflection surface 221. The illuminating light is first incident on the relay lens 210 along the optical axis Z1 of the illumination optical system 100 and passes through the relay lens 210 to the triangular prism 220 The incident image light reflected from the image element 300 is incident on the image light incident surface 222 of the triangular prism 220 and then incident on the reflective image element 300 through the total reflection surface 221 of the triangular prism 220 Is reflected by the total reflection surface 221 of the triangular prism 220 and is incident on the projection optical system 400 through the image light exit surface 223. Wherein the reflective image element preferably comprises one of an image element of the DMD type or a reflective LCD type.

3, in order to compensate for the optical path difference of the illumination light incident on the DMD element 300, the relay lens 210 is configured such that the distances of the paths passing through the illumination light from the light source side are different from each other do.

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 relay lens 210 is referred to as P1 and a light exit point located at one end (Hereinafter referred to as " light outgoing point ") is referred to as P1 ', and the other end light incidence point (hereinafter referred to as the light incidence point at the other end) of the illumination light incident on the lens 210 is referred to as P2, The distance between the paths P1 to P1 'and the paths P2 to P2' through which the illumination light passes in the relay lens 210 is set to be different, and at the same time, the positive power (the light output point) .

4, the relay lens 210 adjusts the angle of incidence of the illumination light incident on the total reflection surface 221 of the prism, so that the line segment a passing through the center of the relay lens 210 is a total reflection surface of the prism 221 with respect to a line segment b extending at an angle perpendicular to the line segment b.

If the angle &amp;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 total reflection plane 221 of the prism. And the light can not be incident on the total reflection surface 221 of the prism. Therefore, the angle θ is in the range of 0 ° <θ <45 °. As a result, the center line a of the relay lens 210 is inclined at 90 ° or more and less than 135 ° with respect to the total reflection surface 221 of the prism.

5 is a view showing a path of light that is generated by the DMD image element 300 and propagated to the projection optical system 400. FIG. 5, in order for the image light generated from the image element 300 to be incident parallel to the optical axis Z2 of the projection optical system 400, when the DMD image element 300 is in an on state at +12 degrees, The inclination θ of the relay lens 210 is adjusted in consideration of the refractive index depending on the material of the prism 220 so as to be incident on the DMD image element 300 maintained at 24 °. Although the DMD image device 300 is described as being turned on at +12 degrees in the present invention, the present invention is not limited thereto. The DMD image device 300 may be turned on at +12 degrees or more. In this case, As shown in FIG.

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 light detector 500 is disposed outside the optical axis of the illumination optical system 100 so as to prevent the illumination light from entering the image element 300.

In the present invention, since the light detector element 500 is disposed outside the optical path Z1 of the illumination optical system 100, preferably on the optical axis Z1 outside the path of the effective illumination light, A part of the first surface 210a and the second surface 210b of the relay lens 210 of the optical path changing unit 200 is moved in the direction of the optical axis .

Specifically, as shown in FIG. 6, the relay lens 210 has one or more internal reflection points, preferably three internal reflection points R1, R2, and R3, for redirecting a portion of the illumination light to the optical scepter 500. [ The light incident on the internal reflection point R1 of the illumination light incident from the illumination optical system 100 is totally reflected at the point R1 at the first surface and totally reflected at the points R2 and R3, And may be incident on the exiting party 500.

In the present embodiment, at least three internal reflection points R1, R2, and R3 are provided on the first surfaces 210a and 210b of the relay lens 210. However, the present invention is not limited to this, 210, and the number of internal reflection points may be varied by adjusting the inclination angle [theta] of the relay lens 210. [

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 image element 300 may be reduced, the brightness of the image projected on the screen may be reduced.

The optical detector 500 transmits the detection value of the RBG component of the illumination light transmitted from the relay lens 210 to the control unit 500. The control unit 500 analyzes the RGB intensity detected from the optical probe 500, The current value or the voltage value input to the green LED 111, the green LED 112, and the blue LED 113 can be adjusted and the quality of the projected image can be optimally maintained.

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 relay lens 210 may vary depending on the material of the relay lens 210, the position of the optical axis Z1, and the like, and thus the present invention is limited by the above- It is not.

FIG. 7 is an explanatory view for explaining the position of the optical detectors 500 in the second embodiment according to the present invention. As shown in FIG. 6, in the projector according to the present invention, the light detector 500 is disposed outside the optical axis of the illumination optical system 100 so as to prevent the illumination light from entering the image element 300.

In the present invention, since the light detector element 500 is disposed outside the optical path Z1 of the illumination optical system 100, preferably on the optical axis Z1 outside the path of the effective illumination light, A portion of the first surface 210a of the relay lens 210 of the optical path changing unit 200 may be further processed to direct a part of the illumination light entering the device 300 to the optical detector 500. [

7, a surface reflection point is formed on the first surface 210a of the relay lens 210 in order to change a part of the illumination light to the optical sifter 500, and is incident on the illumination optical system 100, The light incident on the surface reflection point of the illumination light is reflected and incident on the optical detector 500.

In the second embodiment, the light amount of the light detector device 500 is very small compared with the light amount provided to the light detector device 500 by the total reflection of the relay lens 210 in the first embodiment, It is necessary to be higher than the photosensitivity of the ex-

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 optical system 111, 112, 113: LED light source
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)

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 transmitting the image light to a projection optical system, and a light detection element for receiving illumination light from the illumination 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 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.
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 transmitting the image light to a projection optical system, and a light detection element for receiving illumination light from the illumination 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.
3. The method according to claim 1 or 2,
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.
The method of claim 3,
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.
KR1020150172298A 2015-12-04 2015-12-04 Projector having a photodetector KR101659898B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150172298A KR101659898B1 (en) 2015-12-04 2015-12-04 Projector having a photodetector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150172298A KR101659898B1 (en) 2015-12-04 2015-12-04 Projector having a photodetector

Publications (1)

Publication Number Publication Date
KR101659898B1 true KR101659898B1 (en) 2016-09-30

Family

ID=57079594

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150172298A KR101659898B1 (en) 2015-12-04 2015-12-04 Projector having a photodetector

Country Status (1)

Country Link
KR (1) KR101659898B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Similar Documents

Publication Publication Date Title
EP3598229B1 (en) Light source apparatus and projection system
EP3598230B1 (en) Light source device and projection system
US8573779B2 (en) Lighting device with plural light sources illuminating distinct regions of integrator
JP5954845B2 (en) Illumination optical system, method for improving color unevenness of illumination optical system, projector and projector system
US8740394B2 (en) Illumination optical system for a projector apparatus
WO2018214289A1 (en) Light source system and display device
US20200225570A1 (en) Projection system
KR20100053752A (en) Projection system
CA2751231A1 (en) Laser light source device and image display apparatus
CN104122741B (en) Optical unit and projection display device
KR101185297B1 (en) Projector
KR101659898B1 (en) Projector having a photodetector
US20140185017A1 (en) Projector
KR101352036B1 (en) Optical system for pico projector
US11405597B2 (en) Illumination system and projection device
KR101351351B1 (en) Optical system for pico projector
KR20130043975A (en) Beam projector with equalization lens
US20150281631A1 (en) Projection-type video display apparatus
KR20130066281A (en) Projection system
CN113138524A (en) Compound eye lens group, light source device and projection equipment
US20240201474A1 (en) Projection Device
JP2014206630A (en) Projection type display device
KR102069066B1 (en) Projection device
US20230224440A1 (en) Illumination system and projection apparatus
WO2021143445A1 (en) Light source device and projection apparatus

Legal Events

Date Code Title Description
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20190813

Year of fee payment: 4