WO2009118937A1 - 二次元走査型投影装置 - Google Patents
二次元走査型投影装置 Download PDFInfo
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- WO2009118937A1 WO2009118937A1 PCT/JP2008/068641 JP2008068641W WO2009118937A1 WO 2009118937 A1 WO2009118937 A1 WO 2009118937A1 JP 2008068641 W JP2008068641 W JP 2008068641W WO 2009118937 A1 WO2009118937 A1 WO 2009118937A1
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- deflector
- dimensional scanning
- projection apparatus
- optical system
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- 230000004907 flux Effects 0.000 claims abstract 4
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- 238000009795 derivation Methods 0.000 description 4
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- 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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/101—Scanning systems with both horizontal and vertical deflecting means, e.g. raster or XY scanners
Definitions
- the present invention relates to a two-dimensional scanning projection apparatus that enlarges and projects an image generated by two-dimensionally scanning a light beam emitted from a light source onto a predetermined surface to be scanned.
- a two-dimensional scanning projection apparatus that projects an image generated by two-dimensionally scanning a light beam emitted from a light source on a surface to be scanned such as a screen. Further, in this two-dimensional scanning projection apparatus, an apparatus configured so that the optical axis of the scanning optical system is inclined with respect to the screen is known.
- the two-dimensional scanning projection apparatus configured as described above enables so-called launch projection, in which an image is projected on the entire screen from an image generation unit disposed at the lower part of the screen.
- An apparatus capable of launch projection can achieve space saving compared to a conventional non-launch type projection apparatus in which the optical axis of the scanning optical system is substantially orthogonal to the screen.
- an image projected by the above-described apparatus capable of launch projection has a large TV distortion and trapezoidal distortion as compared with a non-launch type projection apparatus.
- the TV distortion here refers to distortion of an image projected on a screen. Specifically, TV distortion represents numerically the distortion of the long side of the projected image in the short side direction.
- a technique for reducing the TV distortion in the projection apparatus is disclosed in, for example, Japanese Patent Application Laid-Open No. 2004-138719.
- Japanese Patent Application Laid-Open No. 2004-138719 discloses a two-dimensional scanning projection apparatus in which a scanning optical system is disposed between a light source and a screen. In the projection apparatus, the scanning optical system is decentered. Thus, an attempt is made to correct the TV distortion and the like by giving an anamorphic action to the projected image.
- the present invention is a two-dimensional scanning projection apparatus capable of so-called launch projection, and does not employ a complicated and high-accuracy configuration, such as TV distortion and trapezoidal distortion. It is an object of the present invention to provide a two-dimensional scanning projection apparatus capable of effectively correcting the decrease in image quality.
- a two-dimensional scanning projection apparatus scans a light beam emitted from a light source in a first direction and a second direction orthogonal to the first direction, and on the surface to be scanned.
- a two-dimensional scanning projection apparatus that projects a two-dimensional image, a first deflector that deflects a light beam in a first direction, and a scanning optical system disposed between the first deflector and a surface to be scanned;
- the central axis of each optical member constituting the scanning optical system is located on the same straight line as the optical axis of the scanning optical system, and each optical member rotates with respect to the optical axis.
- the center of the scanned surface is shifted in the second direction from the intersection of the plane including the scanned surface and the optical axis, and the first deflector is The rotation axis of one deflector is inclined by a first angle with respect to the second direction in a plane including the optical axis and the second direction.
- the light beam emitted from the light source has a chief ray of the light beam that is incident on the center of the projected image within the plane including the optical axis and the second direction. It is characterized by oblique incidence so as to form two angles.
- the two-dimensional scanning projection apparatus is configured to satisfy the following two conditions.
- H is the distance from the intersection to the center of the lower edge of the scanned surface
- D is the distance from the intersection to one end of the lower edge of the scanned surface
- H ′′ is the distance from the intersection to the center of the upper edge of the scanned surface
- D ′′ is the distance from the intersection point to one end of the upper edge of the scanned surface
- f is the focal length of the scanning optical system
- ⁇ is the half angle of view in the first direction
- ⁇ is the first angle
- ⁇ represents the second angle
- ⁇ represents the half angle of view in the second direction.
- H ′ represents the distance from the intersection to the center of the scanned surface
- D ′ represents the distance from the intersection to the center of the side edge of the scanned surface.
- the second deflector disposed between the light source and the first deflector and deflecting the light beam in the second direction, and the first deflector.
- a relay optical system that is disposed between the second deflector and guides the light beam emitted from the second deflector to the first deflector.
- the light source has a plurality of light emitting units arranged in a direction corresponding to the second direction
- the two-dimensional scanning projection apparatus includes: A condensing optical system may be provided that is disposed between the light source and the first deflector and allows a plurality of light beams emitted from a plurality of light emitting units to simultaneously enter the first deflector.
- two-dimensional scanning is realized by simultaneously scanning a plurality of light beams in the first direction on the surface to be scanned.
- the principal ray incident on the first deflector and the rotation axis of the first deflector are orthogonal to each other in a plane including the optical axis and the second direction. It is desirable that both the first angle and the second angle have the same sign so that the angle formed by the plane is smaller than the second angle.
- the scanning optical system may have at least one reflecting surface that contributes to maintaining constant scanning speed on the surface to be scanned.
- the scanning optical system mounted on the two-dimensional scanning projector according to the present invention has a negative f ⁇ characteristic from f ⁇ characteristic satisfying f ( ⁇ + ⁇ ) ⁇ H ′′ ⁇ f tan ( ⁇ + ⁇ ) to ftan ⁇ characteristic. It is desirable to have distortion.
- the two-dimensional scanning projection apparatus of the present invention even a launch projection type projection apparatus can effectively prevent TV distortion and trapezoidal distortion without using a complicated and highly accurate scanning optical system as in the prior art. It becomes possible to suppress to.
- FIG. 1 is a sub-scanning sectional view schematically showing a configuration of a two-dimensional scanning projection apparatus according to an embodiment of the present invention. It is a figure which expand
- FIG. 1 is a diagram showing a schematic configuration of a launch projection type two-dimensional scanning projection apparatus 100 according to an embodiment of the present invention.
- the projection apparatus 100 includes a projection optical system 10, a first mirror M1, a second mirror M2, and a screen S in a housing 50.
- FIG. 2 is a diagram showing the optical path in the two-dimensional scanning projection apparatus 100 in an expanded manner.
- the reflected light path by the reflective surface of the 1st mirror M1 and the 2nd mirror M2 is developed and shown.
- the projection optical system 10 includes a light source unit 1, a second deflector 2, a relay optical system 3, a first deflector 4, and a scanning optical system 5.
- An axis AX indicated by a one-dot chain line is an optical axis of the scanning optical system 5.
- the normal direction of the optical axis of the scanning optical system 5 on the cross section including the optical axis AX of the scanning optical system 5 and the rotation axis of the first deflector 4 is the vertical direction
- the optical axis AX, A direction perpendicular to the normal is defined as a lateral direction.
- the horizontal direction is parallel to the horizontal plane on which the two-dimensional scanning projection apparatus 100 is placed.
- the vertical direction coincides with the first direction and coincides with the vertical direction and coincides with the second direction.
- the first deflector 4 is referred to as a lateral deflector 4 and the second deflector 2 is referred to as a longitudinal deflector 2.
- the horizontal direction is represented by the Y direction and the vertical direction is represented by the Z direction.
- the direction perpendicular to the Y and Z directions that is, the depth direction of the apparatus perpendicular to the screen S that is the surface to be scanned is defined as the X direction.
- the first mirror M1 and the second mirror M2 are provided depending on the shape of the housing 50 and the positional relationship with other members.
- the optical path may be bent. However, in the following, each member will be described on the assumption that the optical path is unfolded without considering the bending of the optical path by the mirrors.
- the light source unit 1 shown in FIG. 2 irradiates laser light that is on / off modulated in accordance with an image signal transmitted from the outside. Laser light emitted from the light source unit 1 enters the vertical deflector 2.
- the longitudinal deflector 2 is configured to be rotatable around a central axis orthogonal to the paper surface of FIG. That is, the vertical deflector 2 is a deflector for causing the incident laser beam to scan in the vertical direction on the screen S.
- the laser beam deflected by the deflecting surface of the longitudinal deflector 2 is incident on the lateral deflector 4 via the relay optical system 3.
- the relay optical system 3 of the present embodiment includes a front group of lenses L31 to L34 and a rear group of lenses L35 to L38.
- a broken line in the vicinity of the center of the relay optical system 3 in FIG. 2 indicates an intermediate image forming position.
- the axial light beam in the relay optical system 3 enters the approximate center of the screen S. That is, the axial light beam in the relay optical system 3 generates the central region of the projection image.
- the lateral deflector 4 is configured to be rotatable around a central axis parallel to the paper surface of FIG. That is, the lateral deflector 4 is a deflector for causing the incident laser light to scan in the lateral direction on the screen S.
- the scanning optical system 5 is composed of four lenses L51 to L54, and has an almost f ⁇ characteristic as a whole.
- the number of lenses constituting the scanning optical system 5 is merely an example.
- the lenses L51 to L54 of the scanning optical system 5 are not decentered. That is, the central axes of the lenses coincide with each other and form the optical axis AX of the scanning optical system 5.
- Each of the lenses L51 to L54 has a rotationally symmetric power with respect to the optical axis AX.
- each laser beam emitted from the scanning optical system 5 scans the screen S in the horizontal direction.
- the two-dimensional scanning projection apparatus 100 of the present embodiment is configured as a launch projection type. Therefore, as shown in FIG. 2, the center Sc of the screen S is in the vertical direction (that is, the Z direction) from the intersection P between the optical axis AX of the scanning optical system 5 and the plane including the screen S (YZ plane). It is in the shifted position.
- the two-dimensional scanning projector 100 is configured such that the vertical deflector 2 rotates by a predetermined amount for each horizontal scan performed by the horizontal deflector 4.
- the predetermined amount is defined as an amount corresponding to a length obtained by multiplying the number of laser beams simultaneously used for scanning the screen S by a spot size formed on the screen S by the laser beams.
- the lateral deflector 4 is configured such that the central axis 4a of the deflector 4 is inclined with respect to the Z direction in the XZ plane as shown in FIG. It is arranged as follows. In other words, the lateral deflector 4 is arranged so that an angle formed by its central axis and the Z direction (hereinafter referred to as a first angle ⁇ ) is a value other than 0 °. However, the case where it coincides with the Z direction is defined as 0 °, and the direction (counterclockwise direction) indicated by the arrow in FIG.
- FIG. 12 is an enlarged view showing the optical system around the lateral deflector 4 of FIG.
- the two-dimensional scanning projection apparatus 100 is configured such that the light beam via the relay optical system 3 is incident obliquely on the lateral deflector 4.
- the principal ray L of the light beam that passes through the center Sc of the screen S among the light beams incident on the lateral deflector 4 is the lateral deflector on the XZ plane. 4 is configured to form a second angle ⁇ with respect to the optical axis AX when incident on the optical axis AX.
- the second angle ⁇ takes a value other than 0 °.
- the case where the principal ray L incident on the lateral deflector 4 is included in the XY plane is 0 °, and the direction indicated by the arrow in FIG. 12 (counterclockwise direction) is positive.
- the lateral deflector 4 is inclined and the light beam is obliquely incident on the lateral deflector 4.
- a scanning line curve does not occur in a light beam scanned on a plane orthogonal to the central axis of the lateral deflector 4 (referred to as a rotational section for convenience).
- a rotational section for convenience.
- no vertical bending occurs in the case of a light beam scanned on a rotational section including the optical axis AX. Therefore, by tilting the lateral deflector 4, the rotation section and the image projected on the screen S are brought closer. That is, since the projection image is generated by the light beam scanned in the vicinity of the rotational section that is optically good, TV distortion can be suppressed satisfactorily.
- the incident angle of the principal ray L with respect to the lateral deflector 4 is increased by the amount of tilting the lateral deflector 4 in the positive direction (counterclockwise direction) in FIG. Since the second angle ⁇ can be reduced, the scanning line curvature is suppressed satisfactorily, and an image with a small TV distortion is projected onto the screen S.
- the trapezoidal distortion that occurs in the launch projection type projection apparatus can be satisfactorily suppressed to substantially the same level as the non-launch projection type.
- an image formed via the lateral deflector 4 also tilts.
- the apparent angle of view can be increased. Accordingly, it is possible to widen the scanning width on the screen S at a predetermined height as compared with the case where the lateral deflector 4 which is not inclined is used.
- the spot diameter is increased, beam rotation during reflection (a phenomenon in which the beam spot formed on the screen S rotates according to the deflection angle of the light beam deflected by the lateral deflector 4) occurs. Therefore, the incident angle of the light beam at the lateral deflector 4 can be borne by arranging the lateral deflector 4 at an angle. Thereby, said each phenomenon can be suppressed effectively.
- the two-dimensional scanning projection apparatus 100 of the present embodiment is configured such that the first angle ⁇ and the second angle ⁇ have the same sign in order to increase the effectiveness of the fourth effect.
- the two-dimensional scanning projection apparatus 100 is configured to satisfy the following condition (1) and condition (2).
- H is the distance from the intersection P to the center of the lower edge of the screen S
- D is the distance from the intersection P to one end of the lower edge of the screen S
- H ′′ is the distance from the intersection P to the center of the upper edge of the screen S
- D ′′ is the distance from the intersection P to one end of the upper edge of the screen S
- f is the focal length of the scanning optical system 5
- ⁇ is the half angle of view in the horizontal direction
- ⁇ is the first angle
- ⁇ represents the half angle of view in the vertical direction.
- FIG. 3 is a schematic diagram showing each parameter.
- the half angle of view ⁇ in the horizontal direction is obtained by the following equation.
- Ys represents the length of the screen S in the Y direction.
- ⁇ (Ys / f) / cos ( ⁇ + ⁇ )
- Zs represents the length of the screen S in the Z direction.
- ⁇ Zs / f
- Condition (1) is a condition for designing the scanning line located at the upper edge of the screen S so as to have a straight line or a curve that is convex toward the center Sc.
- the condition (2) is a condition for designing the scanning line located at the lower end of the screen S so as to have a straight line or a curve that is convex toward the center Sc. More specifically, when both conditions (1) and (2) have an equal sign relationship, the projected image has a rectangular shape. That is, both the scanning line located on the lower end side and the scanning line located on the upper end side are substantially linear. At other times, the projected image has a so-called pincushion shape. If the projected image is rectangular or pincushioned, a rectangular (rectangular) image corresponding to the screen S that does not generate a region where no scanning line exists, that is, a non-display region is projected on the screen. Can do.
- H ′ represents the distance from the intersection P to the center of the screen S
- D ′ represents the distance from the intersection P to the center of the side edge of the screen S.
- Condition (3) is a condition for reducing TV distortion at the center of the screen S. By satisfying the condition (3), even the launch projection type apparatus 100 can project a high-quality image close to the non-launch type. Furthermore, if the first angle ⁇ is made large within the range that satisfies the condition (3), it is possible to secure a larger angle of view and reduce the size and thickness of the device, or to enhance the trapezoidal distortion correction effect. Become.
- FIG. 4 shows the lateral deflector 4 which is arranged with the rotational section 4p parallel to the horizontal plane. That is, in FIG. 4, the lateral deflector 4 is disposed so that the central axis 4a is parallel to the Z direction.
- a state is assumed in which the light beam reflected by the lateral deflector 4 travels at an angle ( ⁇ + ⁇ ) with respect to the rotational section 4 p of the lateral deflector 4. It is assumed that the lateral deflector 4 is not rotating. That is, the light beam is not deflected by the lateral deflector 4 and travels on the XZ plane including the optical axis AX of the scanning optical system 5.
- a point A that is separated from the lateral deflector 4 by a certain distance (for example, 1) in the optical path of the light beam is assumed.
- the coordinates (X, Y, Z) of point A are X ... cos ( ⁇ + ⁇ ) Y ... 0 Z ... sin ( ⁇ + ⁇ ) It is expressed.
- FIG. 5 shows a state in which the lateral deflector 4 is rotated by a certain amount from the state shown in FIG. 4 and the light beam is deflected by an angle ⁇ (that is, a half angle of view in the lateral direction).
- ⁇ that is, a half angle of view in the lateral direction.
- the coordinates (X, Y, Z) of point A ′ are X ... cos ⁇ cos ( ⁇ + ⁇ ) Y ... sin ⁇ cos ( ⁇ + ⁇ ) Z ... sin ( ⁇ + ⁇ ) It is expressed.
- FIG. 6 shows a state in which the lateral deflector 4 is tilted by a predetermined amount while maintaining the state shown in FIG.
- the lateral deflector 4 shown in FIG. 6 is arranged such that the central axis 4a of the deflector 4 is inclined by the first angle ⁇ with respect to the Z direction in the XZ plane. Therefore, the rotational cross section 4p 'in the tilted lateral deflector 4 is tilted by ⁇ with respect to the rotational cross section (horizontal plane) 4p.
- directions corresponding to the X, Y, and Z directions are defined as x, y, and z directions, respectively.
- the coordinates (X, Y, Z) of the point A ′ are X ... cos ⁇ cos ⁇ cos ( ⁇ + ⁇ ) ⁇ sin ⁇ sin ( ⁇ + ⁇ ) Y ... sin ⁇ cos ( ⁇ + ⁇ ) Z ... sin ⁇ cos ⁇ sin ( ⁇ + ⁇ ) + cos ⁇ sin ( ⁇ + ⁇ ) It is expressed.
- FIG. 7 is an explanatory diagram for deriving the condition (1). In FIG. 7, it is assumed that the point A ′ is located near one end of the upper edge of the screen S.
- the angle ⁇ shown in FIG. 7 is defined as an angle formed by a normal line of the screen (that is, the optical axis AX) and a light ray directed to the point A ′.
- the distance between the intersection Q of the virtual line i1 extending in the Y direction from the intersection P and the virtual line i2 extending in the Z direction from the point A ′ is set to h.
- the distance h is obtained by the following equation (6).
- Equation (8) relating to h is obtained.
- the scanning line is linear. If the distance h is smaller than the distance H ′′, the upper edge of the screen S. One end of the scan line is not reachable. That is, a non-display area is generated at one end of the upper edge of the screen S. Therefore, in order to reduce the TV distortion and prevent the occurrence of the non-display area, the distance h and the distance H ′′ may be set so that the following relationship is established. h ⁇ H ”
- the conditions (2) and (3) can also be derived in the same manner as the condition (1) by changing the position of the point A ′ shown in FIG.
- the two-dimensional scanning projection apparatus 100 of each embodiment is shown in FIG.
- Table 1 shows specific numerical configurations of the relay optical system 3 constituting the projection optical system 10 of each of the first and second embodiments.
- r is a radius of curvature (unit: mm) of each surface of the optical member
- d is an optical member thickness or optical member interval (unit: mm)
- n is a refractive index.
- the vertical deflector 2 deflects the incident light beam in a range of ⁇ 30.2 ° in the vertical direction around the optical axis of the relay optical system 3.
- the lateral deflector 4 in the first embodiment is arranged so that the central axis 4a is inclined by 17 ° with respect to the reference axis when a reference axis orthogonal to the optical axis of the relay optical system 3 is assumed. Further, the lateral deflector 4 in the second embodiment is disposed such that the central axis 4a is inclined by 11 ° with respect to the reference axis.
- the central axis 4a is inclined by 8 ° with respect to the reference axis. It is arranged. Further, the lateral deflector 4 in the second embodiment is disposed so that the central axis 4a is inclined by 14 ° with respect to the reference axis.
- Table 3 shows parameters related to the above conditions in the two-dimensional scanning projection apparatus 100 of Example 1 configured as described above.
- Table 4 shows parameters relating to the above conditions in the two-dimensional scanning projection apparatus 100 according to the second embodiment.
- the two-dimensional scanning projection apparatus 100 of Example 1 satisfies both the conditions (1) and (2). Further, as shown in Table 4, the two-dimensional scanning projection apparatus 100 of Example 2 satisfies all the conditions (1) to (3).
- FIG. 8 A comparative two-dimensional scanning projection apparatus 300 is shown in FIG. In the two-dimensional scanning projection apparatus 300 of the comparative example, except that the central axis 4a of the lateral deflector 4 is orthogonal to the optical axis AX of the scanning optical system 5, that is, the lateral deflector 4 is not inclined.
- the configuration is the same as in the first and second embodiments. Therefore, in FIG. 8, the same members as those shown in FIG.
- Table 1 and Table 2 are referred to for specific numerical configurations of the projection optical system constituting the two-dimensional scanning projection apparatus 300 of the comparative example.
- the central axis 4a is inclined by 25 ° with respect to the reference axis. It is arranged. Further, the lateral deflector 4 in the comparative example is disposed so that the central axis 4 a is orthogonal to the optical axis AX of the scanning optical system 5.
- Table 5 shows the parameters related to the above conditions for the comparative example described above.
- the two-dimensional scanning projection apparatus 300 of the comparative example satisfies only one of the conditions (1) and (2) (condition (2)) that must be satisfied.
- FIGS. 9 to 11 are diagrams showing, in order, distortion states of images projected using the two-dimensional scanning projection apparatus 100 of each of the first and second embodiments and the two-dimensional scanning projection apparatus 300 of the comparative example.
- a solid line shows a distorted state of an image projected using the projection apparatuses 100 and 300 of each example.
- a broken line indicates a distorted state of an image projected using a non-launch type projection apparatus in which the optical axis of the projection optical system of each example is the center of the screen and substantially orthogonal to the screen.
- the above is the embodiment of the present invention.
- the two-dimensional scanning projection apparatus according to the present invention is not limited to the configuration of the above embodiment, and the same effects as described above can be obtained even if the following modifications are made.
- the scanning optical system 5 is entirely composed of lenses.
- the two-dimensional scanning projection apparatus according to the present invention may employ a scanning optical system including a reflecting surface that contributes to maintaining the constant velocity of the incident light beam, such as an f ⁇ mirror.
- a reflecting surface for turning back the optical path is essential. Therefore, by using a part of the scanning optical system as an f ⁇ mirror, it is possible to share parts and reduce the number of parts. Thereby, the productivity of the whole apparatus can be improved.
- the scanning optical system 5 is an optical system having a negative distortion smaller than the f ⁇ characteristic within the range of the correction effect.
- the scanning optical system 5 is f ( ⁇ + ⁇ ) ⁇ H ′′ ⁇ f tan ( ⁇ By having a configuration with negative distortion from f ⁇ characteristics to ftan ⁇ characteristics satisfying + ⁇ ), a large field angle peculiar to a scanning optical system having a large negative distortion lens is required while maintaining the TV distortion correction effect. Therefore, the entire scanning optical system can be reduced in size.
- FIG. 13 shows a modification of the two-dimensional scanning projection apparatus according to the present invention, and shows the configuration of a two-dimensional scanning projection apparatus 100z that realizes two-dimensional scanning with a single deflector.
- FIG. 13 shows an expanded optical path in the two-dimensional scanning projection apparatus 100z, as in FIG.
- the projection optical system 10 z included in the two-dimensional scanning projection apparatus 100 z includes an array light source 1 ′, a lateral deflector 4, a scanning optical system 5, and a condensing optical system 6.
- the array light source 1 ′ is a light source including a plurality of light emitting units arranged along a direction corresponding to the vertical direction on the screen S, for example. Further, the condensing optical system 6 is configured and arranged so that a plurality of light beams emitted from the array light source 1 ′ are incident on the lateral deflector 4 without exception.
- the light beams emitted from the light emitting units arrayed in the vertical direction are transmitted from the vicinity of the upper edge of the screen S on the screen S via the condensing optical system 6, the lateral deflector 4, and the scanning optical system 5.
- a vertical line of beam spots reaching the vicinity of the lower edge is formed. For this reason, the entire image to be projected is projected on the screen S only by the light beam irradiated from each light emitting unit being scanned once in the lateral direction by the lateral deflector 4. Even with such a configuration, two-dimensional scanning is possible.
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Abstract
Description
α=(Ys/f)/cos(β+ρ)
また、縦方向における半画角ωは、以下の式により求まる。但し、Zsは、スクリーンSのZ方向長さを表す。
ω=Zs/f
X…cos(β+ω)
Y…0
Z…sin(β+ω)
と表される。
X…cosαcos(β+ω)
Y…sinαcos(β+ω)
Z…sin(β+ω)
と表される。
X…cosρcosαcos(β+ω)-sinρsin(β+ω)
Y…sinαcos(β+ω)
Z…sinρcosαsin(β+ω)+cosρsin(β+ω)
と表される。
θ=D”/f…(4)
h≧H”
Claims (8)
- 光源から照射された光束を、第一方向および該第一方向に直交する第二方向に走査し、被走査面上に二次元像を投影する二次元走査型投影装置であって、
前記光束を第一方向に偏向する第一の偏向器と、
前記第一の偏向器と前記被走査面間に配設される走査光学系と、を有し、
前記走査光学系は、該走査光学系を構成する各光学部材の中心軸が該走査光学系の光軸として同一直線上に位置し、かつ各光学部材が前記光軸に対して回転対称なパワーを有するように構成され、
前記被走査面の中心は、該被走査面を含む平面と前記光軸との交点よりも前記第二方向にシフトしており、
前記第一の偏向器は、該第一の偏向器の回転軸が、前記光軸および前記第二方向を含む面内において、前記第二方向に対して第一の角度だけ傾いて配設され、
前記光源から照射された光束は、前記光軸および前記第二方向を含む面内において、前記投影画像中心に入射することになる光束の主光線が前記第一の偏向器に、前記光軸に対して第二の角度をなすように斜入射することを特徴とする二次元走査型投影装置。 - 前記光源と前記第一の偏向器の間に配設され、前記光束を第二方向に偏向する第二の偏向器と、
前記第一の偏向器と前記第二の偏向器の間に配設され、前記第二の偏向器から射出された光束を前記第一の偏向器に導くリレー光学系と、を有することを特徴とする請求項1から請求項3のいずれかに記載の二次元走査型投影装置。 - 前記光源は、前記第二方向に対応する方向に配設された複数の発光部を有しており、
前記二次元走査型投影装置は、前記光源と前記第一偏向器の間に配設され、前記複数の発光部から照射された複数の光束を同時に前記第一の偏向器に入射させる集光光学系を有しており、
前記被走査面上において、前記複数の光束を同時に第一方向に走査させることにより、二次元走査を実現することを特徴とする請求項1から請求項3のいずれかに記載の二次元走査型投影装置。 - 請求項1から請求項5のいずれかに記載の二次元走査型投影装置において、
前記光軸および前記第二方向を含む面内において、前記第一の偏向器に入射される前記主光線と前記第一の偏向器の回転軸に直交する平面とがなす角度が前記第二の角度よりも小さくなるように、前記第一の角度と該第二の角度が共に同符号であることを特徴とする二次元走査型投影装置。 - 請求項1から請求項6のいずれかに記載の二次元走査型投影装置において、
前記走査光学系は、前記被走査面上における走査の等速性の維持に寄与する少なくとも一枚の反射面を有することを特徴とする二次元走査型投影装置。 - 請求項1から請求項7のいずれかに記載の二次元走査型投影装置において、
前記走査光学系は、f(β+ω)≦H”≦ f tan(β+ω)を満足するfθ特性からftanθ特性までの負のディストーションを有することを特徴とする二次元走査型投影装置。
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JP2010505259A JP5492765B2 (ja) | 2008-03-26 | 2008-10-15 | 二次元走査型投影装置 |
GB1018022.2A GB2471431B (en) | 2008-03-26 | 2008-10-15 | Two-dimensional scanning projector |
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JPWO2018110448A1 (ja) * | 2016-12-12 | 2019-10-24 | ソニーセミコンダクタソリューションズ株式会社 | 投影光学系、画像投影装置、および画像投影システム |
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WO2018040017A1 (zh) * | 2016-08-31 | 2018-03-08 | 深圳大学 | 一种基于自适应条纹的投影仪镜头畸变校正方法及其系统 |
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CN101981486A (zh) | 2011-02-23 |
US20110013247A1 (en) | 2011-01-20 |
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GB201018022D0 (en) | 2010-12-08 |
CN101981486B (zh) | 2013-01-16 |
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US9772544B2 (en) | 2017-09-26 |
JP5492765B2 (ja) | 2014-05-14 |
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