WO2024257479A1 - 光学系、画像投写装置および撮像装置 - Google Patents

光学系、画像投写装置および撮像装置 Download PDF

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Publication number
WO2024257479A1
WO2024257479A1 PCT/JP2024/015387 JP2024015387W WO2024257479A1 WO 2024257479 A1 WO2024257479 A1 WO 2024257479A1 JP 2024015387 W JP2024015387 W JP 2024015387W WO 2024257479 A1 WO2024257479 A1 WO 2024257479A1
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Prior art keywords
optical system
attachment
distance
image
optical
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Ceased
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English (en)
French (fr)
Japanese (ja)
Inventor
卓也 今岡
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Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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Priority to JP2025527514A priority Critical patent/JPWO2024257479A1/ja
Publication of WO2024257479A1 publication Critical patent/WO2024257479A1/ja
Priority to US19/350,322 priority patent/US20260029697A1/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/16—Optical objectives specially designed for the purposes specified below for use in conjunction with image converters or intensifiers, or for use with projectors, e.g. objectives for projection TV
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/02—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective
    • G02B15/04—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective by changing a part
    • G02B15/06—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective by changing a part by changing the front part
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/02—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective
    • G02B15/04—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective by changing a part
    • G02B15/08—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective by changing a part by changing the rear part
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/02—Catoptric systems, e.g. image erecting and reversing system
    • G02B17/04—Catoptric systems, e.g. image erecting and reversing system using prisms only
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/08—Catadioptric systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/14—Mountings, adjusting means, or light-tight connections, for optical elements for lenses adapted to interchange lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
    • G02B7/1805—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for prisms
    • 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
    • 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
    • G03B21/28—Reflectors in projection beam

Definitions

  • This disclosure relates to an optical system using a prism. This disclosure also relates to an image projection device and an imaging device using such an optical system.
  • an attachment optical system is detachably attached to the enlarged side of the projection optical system 3 of the projector, and the image is projected onto an imaging surface (e.g., a dome-shaped screen or a diagonal wide-angle screen) different from the projection optical system.
  • an imaging surface e.g., a dome-shaped screen or a diagonal wide-angle screen
  • the present disclosure provides an optical system capable of short-focus, large-screen projection or imaging in an oblique direction, and capable of variably setting the amount of shift of the projection range or imaging range from the optical axis.
  • the present disclosure also provides an image projection device and imaging device that use such an optical system.
  • One aspect of the present disclosure is an optical system having a reduction conjugate point on a reduction side and a magnification conjugate point on a magnification side,
  • a base optical system having a plurality of lenses that are rotationally symmetric with respect to an optical axis and an aperture; a first attachment optical system disposed on the enlargement side of the base optical system, the first attachment optical system including a first reflecting surface group and having a first optical characteristic; a second attachment optical system that is disposed on the enlargement side of the base optical system, includes a second reflecting surface group, and has a second optical characteristic different from the first optical characteristic;
  • An image projection device includes the above optical system and an image forming element that generates an image to be projected onto a screen via the optical system.
  • An imaging device includes the above optical system and an imaging element that receives an optical image formed by the optical system and converts it into an electrical image signal.
  • the optical system disclosed herein allows the shift amount of the projection range or imaging range from the optical axis to be variably set by replacing the attachment optical system.
  • FIG. 1A to 1C are side views showing various configurations of an optical system according to the present disclosure
  • FIG. 1D to FIG. 1F are top views thereof.
  • Layout diagram showing an optical system 1 according to Example 1 Fig. 3A is a perspective view showing the three-dimensional shape of each optical surface of the prism PM, and Fig. 3B shows a part of a light ray traveling inside the prism PM.
  • Fig. 4A is a cross-sectional view of the prism PM along the YZ plane, and Fig. 4B shows a part of a light ray traveling inside the prism PM.
  • Fig. 5A is a top view of the prism PM as viewed from the Y direction, and Fig. 5B shows a part of a light beam traveling inside the prism PM.
  • Fig. 6A is a YZ cross-sectional view for explaining the definitions of the first point on the first transmitting surface T1, the second point on the second reflecting surface R2, and the angle of incidence of the light ray on the second reflecting surface R2.
  • Fig. 6B is a YZ cross-sectional view for explaining the definitions of the distances PL1 and PL2.
  • 4A to 4C are lateral aberration diagrams of the optical system 1 including the first attachment optical system 11 according to the first embodiment.
  • 4A to 4C are lateral aberration diagrams of the optical system 1 including the second attachment optical system 12 according to Example 1.
  • 4A to 4C are lateral aberration diagrams of the optical system 1 including the third attachment optical system 13 according to Example 1.
  • FIG. 11 is a layout diagram showing an optical system 1 according to a second embodiment.
  • 6A to 6C are lateral aberration diagrams of the optical system 1 including the first attachment optical system 11 according to Example 2.
  • 6A to 6C are lateral aberration diagrams of the optical system 1 including the second attachment optical system 12 according to Example 2.
  • 6A to 6C are lateral aberration diagrams of the optical system 1 including the third attachment optical system 13 according to Example 2.
  • Fig. 14A shows a state in which the image projection device 100 is installed on the lower surface of a ceiling CE
  • Fig. 14B shows a state in which the image projection device 100 is installed on the upper surface of a ceiling CE.
  • 15A and 15B are diagrams for explaining the definitions of variables in equation (1), and are a YZ cross-sectional view and a ZX cross-sectional view, respectively.
  • 1 is an explanatory diagram showing the relationship between the vertical position of an image forming element and the vertical position of an effective area onto which all light rays are projected on a screen.
  • 1 is a block diagram illustrating an example of an image projection device according to the present disclosure.
  • FIG. 1 is a block diagram illustrating an example of an imaging device according to the present disclosure.
  • the optical system disclosed herein can also be used to collect light emitted from an object located on the extension of the magnification side and form an optical image of the object on the imaging surface of an imaging element located on the reduction side.
  • FIG. 1 An optical system according to a first embodiment of the present disclosure will be described below with reference to Figures 1 to 15.
  • Figures 1(A) to 1(C) are side views showing various configurations of the optical system according to the present disclosure, and Figures 1(D) to 1(F) are top views thereof.
  • optical system 1 When optical system 1 is used in an image projection device, an effective area onto which all light rays are projected is set on screen SR, and the shift amount SF from optical axis OA of optical system 1 to the center of the vertical range of the effective area can be defined.
  • the change in the horizontal half angle of view of the light projected from the optical system 1 can be set small, for example to 2 degrees or less.
  • Example 1 Fig. 2 is a layout diagram showing an optical system 1 according to Example 1.
  • the optical system 1 includes a base optical system 10 including a plurality of lenses and an aperture stop ST, and first to third attachment optical systems 11 to 13 including a plurality of lenses and a prism PM.
  • a reduction conjugate point which is an imaging position on the reduction side, is located on the right side of the optical axis OA
  • a magnification conjugate point which is an imaging position on the magnification side, is located on the lower left side of the optical axis OA.
  • the base optical system 10 includes, in order from the reduction side to the enlargement side, an optical element PA and lens elements L1 to L5.
  • the optical element PA represents optical elements such as a TIR (total internal reflection) prism, a prism for color separation and color synthesis, an optical filter, parallel plate glass, a quartz low-pass filter, and an infrared cut filter.
  • a reduction conjugate point is set at a position a predetermined distance from the reduction side end face of the optical element PA, and the original image SA is placed here (surface 23).
  • surface 23 For the surface numbers, refer to the numerical examples described later.
  • Optical element PA has two parallel, flat transmitting surfaces (surfaces 21, 22).
  • Lens element L1 has a biconvex shape (surfaces 19, 20).
  • Lens element L2 has a biconvex shape (surfaces 17, 18).
  • Lens element L3 has a biconcave shape (surfaces 15, 16).
  • Lens element L4 has a biconvex shape (surfaces 13, 14).
  • Lens element L5 has a biconvex shape (surfaces 9, 10).
  • These lens elements L1 to L5 are rotationally symmetric lenses that have surface shapes that are rotationally symmetric around the optical axis OA of the base optical system 10, and portions through which light rays do not pass may be removed if necessary.
  • the aperture stop ST defines the range through which the light beam passes through the optical system 1, and is positioned between the reduction conjugate point and the intermediate image position described above.
  • the aperture stop ST (surface 12) is located between lens element L4 and lens element L5.
  • the first to third attachment optical systems 11 to 13 include lens elements L6 to L7 and a prism PM.
  • Lens elements L6 to L7 are rotationally symmetric lenses having a surface shape that is rotationally symmetric about the optical axis OA, and portions through which light rays do not pass may be removed if necessary.
  • Lens element L6 has a positive meniscus shape with the convex surface facing the reduction side (surfaces 7 and 8).
  • Lens element L7 has a biconcave shape (surfaces 5 and 6).
  • the prism PM is formed of a transparent medium, such as glass or synthetic resin.
  • the prism PM has a first transmitting surface T1 located on the reduction side, a second transmitting surface T2 located on the enlargement side, and two reflecting surfaces R1 and R2 located on the optical path between the first transmitting surface T1 and the second transmitting surface T2 as a plurality of optical surfaces.
  • the first transmitting surface T1 has a free-form shape with a convex surface facing the reduction side (surface 4).
  • the first reflecting surface R1 has a free-form shape with a concave surface (principal curvature) facing the direction in which the light ray incident on the first reflecting surface R1 is reflected (surface 3).
  • the second reflecting surface R2 has a free-form shape with a concave surface (principal curvature) facing the direction in which the light ray incident on the second reflecting surface R2 is reflected (surface 2).
  • the second transmitting surface T2 has a free-form shape with a convex surface facing the enlargement side (surface 1).
  • Figure 3(A) is a perspective view showing the three-dimensional shape of each optical surface of the prism PM, and Figure 3(B) shows a portion of the light rays traveling inside the prism PM.
  • Figure 4(A) is a cross-sectional view of the prism PM along the YZ plane, and Figure 4(B) shows a portion of the light rays traveling inside the prism PM.
  • Figure 5(A) is a top view of the prism PM as seen from the Y direction, and Figure 5(B) shows a portion of the light rays traveling inside the prism PM.
  • FIG. 6(A) is a YZ cross-sectional view explaining the definitions of the first point on the first transmitting surface T1, the second point on the second reflecting surface R2, and the angle of incidence of the light ray on the second reflecting surface R2.
  • FIG. 6(B) is a YZ cross-sectional view explaining the definitions of the distances PL1 and PL2. Details will be described later.
  • the solid line is a wavelength of 550.0000 nm
  • the dashed line is a wavelength of 610.0000 nm
  • the dashed line is a wavelength of 455.0000 nm. From these graphs, it can be seen that the optical system 1 according to Example 1 exhibits excellent optical performance.
  • Example 2 Fig. 10 is a layout diagram showing an optical system 1 according to Example 2.
  • the optical system 1 includes a base optical system 10 including a plurality of lenses and an aperture stop ST, and first to third attachment optical systems 11 to 13 including a plurality of lenses and a prism PM.
  • a reduction conjugate point which is an imaging position on the reduction side, is located on the right side of the optical axis OA
  • a magnification conjugate point which is an imaging position on the magnification side, is located on the lower left side of the optical axis OA.
  • the base optical system 10 includes, in order from the reduction side to the enlargement side, an optical element PA and lens elements L1 to L4.
  • a reduction conjugate point is set at a position a predetermined distance from the reduction side end face of the optical element PA, and the original image SA is placed here (surface 23).
  • surface 23 For the surface numbers, please refer to the numerical examples described later.
  • Optical element PA has two parallel, flat transmitting surfaces (surfaces 21, 22).
  • Lens element L1 has a positive meniscus shape with the convex surface facing the reduction side (surfaces 19, 20).
  • Lens element L2 has a biconvex shape (surfaces 17, 18).
  • Lens element L3 has a biconcave shape (surfaces 15, 16).
  • Lens element L4 has a biconvex shape (surfaces 13, 14).
  • These lens elements L1 to L4 are rotationally symmetric lenses that have surface shapes that are rotationally symmetric around the optical axis OA of the base optical system 10, and portions through which light rays do not pass may be removed if necessary.
  • the first to third attachment optical systems 11 to 13 include lens elements L5 to L7 and a prism PM.
  • Lens elements L5 to L7 are rotationally symmetric lenses having surface shapes that are rotationally symmetric around the optical axis OA, and portions through which light rays do not pass may be removed if necessary.
  • Lens element L5 has a positive meniscus shape with a convex surface facing the reduction side (surfaces 9 and 10).
  • Lens element L6 has a positive meniscus shape with a convex surface facing the reduction side (surfaces 7 and 8).
  • Lens element L7 has a biconcave shape (surfaces 5 and 6).
  • the prism PM has a plurality of optical surfaces, including a first transmitting surface T1 located on the reduction side, a second transmitting surface T2 located on the enlargement side, and two reflecting surfaces, a first reflecting surface R1 and a second reflecting surface R2, located on the optical path between the first transmitting surface T1 and the second transmitting surface T2.
  • the first transmitting surface T1 has a free-form shape with a convex surface facing the reduction side (surface 4).
  • the first reflecting surface R1 has a free-form shape with a concave surface (principal curvature) facing the direction in which the light ray incident on the first reflecting surface R1 is reflected (surface 3).
  • the second reflecting surface R2 has a free-form shape with a convex surface (principal curvature) facing the direction in which the light ray incident on the second reflecting surface R2 is reflected (surface 2).
  • the second transmitting surface T2 has a free-form shape with a convex surface facing the enlargement side (surface 1).
  • FIG. 11 is a lateral aberration diagram of the optical system 1 including the first attachment optical system 11 according to Example 2.
  • FIG. 12 is a lateral aberration diagram of the optical system 1 including the second attachment optical system 12 according to Example 2.
  • FIG. 13 is a lateral aberration diagram of the optical system 1 including the third attachment optical system 13 according to Example 2.
  • the optical system according to this embodiment is an optical system having a reduction conjugate point on the reduction side and a magnification conjugate point on the magnification side,
  • a base optical system 10 having a plurality of lenses that are rotationally symmetric with respect to an optical axis OA and an aperture;
  • a first attachment optical system 11 disposed on the enlargement side of the base optical system 10, including a first reflecting surface group and having a first optical characteristic;
  • a second attachment optical system (12) disposed on the enlargement side of the base optical system, including a second reflecting surface group, and having a second optical characteristic different from the first optical characteristic;
  • an intermediate imaging position that is conjugate to the magnification conjugate point and the reduction conjugate point, respectively, may be provided on the optical path of the first attachment optical system 11 attached to the base optical system 10 or the second attachment optical system 12 attached to the base optical system 10.
  • the first attachment optical system 11 includes a first prism PM having the first reflecting surface group
  • the second attachment optical system 12 includes a second prism PM having the second reflecting surface group
  • the intermediate imaging position may be provided on the optical path inside the first prism PM or the second prism PM.
  • the size of the light beam is small around the intermediate imaging position, making it possible to miniaturize the attachment optical system.
  • the first prism PM or the second prism PM has, in order from the reduction side to the enlargement side, a first transmitting surface T1, a first reflecting surface R1, a second reflecting surface R2, and a second transmitting surface T1, and the intermediate imaging position may be provided between the first transmitting surface T1 and the first reflecting surface R1.
  • the size of the light beam is small around the intermediate imaging position, making it possible to miniaturize the attachment optical system.
  • the vertical distance when the overall focal length fa of all the rotationally symmetric lenses included in the base optical system and each attachment optical system increases by replacing the first attachment optical system with the second attachment optical system, the vertical distance may increase.
  • This configuration allows the projection range to be changed while maintaining good optical performance of the entire optical system.
  • the vertical distance when the angle of incidence ⁇ i2m at which the chief ray of the light beam closest to the optical axis is incident on the second reflecting surface increases by replacing the first attachment optical system with the second attachment optical system, the vertical distance may also increase.
  • the chief ray PR of the light beam closest to the optical axis OA is reflected by the first reflecting surface R1 and then enters the second point (yr2, zr2) on the second reflecting surface R2.
  • the normal NA at the second point (yr2, zr2) can be defined.
  • the angle of incidence of the chief ray PR on the second reflecting surface R2 can be defined as the angle of incidence ⁇ i2m between the normal NA at the second point and the traveling direction of the chief ray PR. Therefore, when the angle of incidence ⁇ i2m incident on the second reflecting surface increases by replacing the attachment optical system, it is preferable that the vertical distance also increases, which allows the projection range to be changed while maintaining good optical performance of the entire optical system.
  • the first reflecting surface may have positive power.
  • This configuration allows for a more compact optical system and a reduced number of lenses.
  • the first reflecting surface may have a stronger positive power than the second reflecting surface.
  • This configuration allows the prism to be made smaller.
  • the optical system according to this embodiment may satisfy the following formula (1).
  • D Distance between the magnified conjugate point and the optical system
  • V Length in a first direction parallel to the vertical direction of the effective area onto which all light rays are projected or imaged on a conjugate plane including the magnified conjugate point
  • H Length in a second direction parallel to the vertical direction of the effective area onto which all light rays are projected or imaged on a conjugate plane including the magnified conjugate point
  • SF Vertical distance from the optical axis to the center of the first direction length of the effective area.
  • FIG. 14(A) when an optical system is mounted on an image projection device 100 and oblique projection is performed toward a screen SR (magnified conjugate point), the image projection device 100 is generally often installed on the underside of a ceiling CE. The audience views the image projected onto the screen SR, but is also aware of the presence of the image projection device 100.
  • FIG. 14(B) it is possible to imagine installing the image projection device 100 on the upper surface of the ceiling CE and performing oblique projection toward the screen SR. In this case, the image projection device 100 is hidden by the ceiling CE, making it difficult for the audience to recognize the presence of the image projection device 100, and they can immerse themselves in viewing the image.
  • an optical system capable of projection in a diagonal direction that is greatly inclined with respect to the screen SR is required.
  • FIGs 14(A) and 14(B) an example is shown in which the image projection device 100 is installed on the ceiling CE side and an image is projected downward, but alternatively, the image projection device 100 may be installed on the floor side and an image may be projected diagonally upward. Also, the image projection device 100 may be installed on the side wall of the room (the right or left wall) and an image may be projected diagonally horizontally (to the left or right).
  • FIG. 15 is a diagram for explaining the definition of variables in formula (1), with FIG. 15(A) showing a YZ cross section and FIG. 15(B) showing a ZX cross section.
  • the optical system can satisfy formula (1) when the distance between the screen SR and the optical system of the image projection device 100 is D, the length of the effective area on the screen SR onto which all light rays are projected in a second direction perpendicular to the direction perpendicular to the magnified conjugate point perpendicular to the optical axis OA is H, the length of the effective area on the screen SR onto which all light rays are projected in a first direction parallel to the vertical direction is V, and the vertical distance from the optical axis OA to the center of the length of the effective area in the first direction is SF.
  • a configuration can be realized in which the projection distance D to the screen SR is small (so-called short focus projection) and the vertical distance SF is large (so-called super shift projection).
  • z sag amount of a surface parallel to the z axis
  • c curvature at the vertex of the surface
  • k Conic coefficient
  • a to H 4th to 18th order coefficients of r.
  • the free-form surface shape is expressed as a local Cartesian coordinate system (x, y, z) with the vertex of the surface as the origin. It is defined by the following formula using
  • z Sag amount of the surface parallel to the z axis
  • c curvature at the surface vertex
  • k conic coefficient
  • C j coefficient of the monomial x my n .
  • the i-th term of x and the j-th term of y which are the free-form surface coefficients in the polynomial, are written as x**i*y**j.
  • "X**2*Y” indicates that the free-form surface coefficients are the quadratic term of x and the linear term of y in the polynomial.
  • lens data of the optical system including the first attachment optical system 11 is shown in Table 10
  • aspheric shape data of the lens is shown in Table 11
  • free-form surface shape data of the prism is shown in Table 12.
  • Lens data of the optical system including the second attachment optical system 12 is shown in Table 13
  • aspheric shape data of the lens is shown in Table 14
  • free-form surface shape data of the prism is shown in Table 15.
  • Lens data of the optical system including the third attachment optical system 13 is shown in Table 16 aspheric shape data of the lens is shown in Table 17, and free-form surface shape data of the prism is shown in Table 18.
  • Table 19 below shows the overall focal length fa of the rotationally symmetric lens in each of Numerical Examples 1 and 2, and the corresponding values of Equation (1).
  • the image-forming element is often also shifted in the Y direction from the optical axis PA as necessary.
  • the shift amounts of the image-forming element in the Y direction are -7.182 mm and -9.018 mm, respectively. That is, in FIG. 2, the center position of the original image SA of the image-forming element is shifted downward by 7.182 mm and 9.018 mm with respect to the optical axis OA.
  • FIG. 17 is a block diagram showing an example of an image projection device according to the present disclosure.
  • the image projection device 100 includes the optical system 1 disclosed in the first embodiment, an image forming element 101, a light source 102, a control unit 110, a moving unit 120, and the like.
  • the image forming element 101 is composed of a liquid crystal, a DMD, and the like, and generates an image to be projected on the screen SR via the optical system 1.
  • the light source 102 is composed of an LED (light emitting diode), a laser, and the like, and supplies light to the image forming element 101.
  • the control unit 110 is composed of a CPU or an MPU, and the like, and controls the entire device and each component.
  • the optical system 1 may be configured as an interchangeable lens that can be detachably attached to the image projection device 100, or may be configured as an integrated lens integrated into the image projection device 100.
  • the moving unit 120 moves and positions the image forming element 101 between multiple positions along a direction perpendicular to the optical axis of the optical system 1 according to commands from the control unit 110.
  • the image projection device includes the optical system according to embodiment 1 and an image forming element that generates an image to be projected onto a screen via the optical system.
  • This configuration makes it possible to use a small device to project a large screen at an angle perpendicular to the optical axis with a short focal length.
  • the image projection device 100 further includes a moving unit 120 that moves a position of the image forming element 101 between a first position along the vertical direction and a second position that is farther from the optical axis than the first position,
  • a moving unit 120 that moves a position of the image forming element 101 between a first position along the vertical direction and a second position that is farther from the optical axis than the first position
  • the first attachment optical system 11 is attached to the base optical system 10
  • the vertical distance is changed from the first distance to a second distance greater than the first distance
  • the second attachment optical system 12 is attached to the base optical system 10
  • the vertical distance is changed from a third distance to a fourth distance greater than the third distance
  • the third distance may be greater than the first distance
  • the fourth distance may be greater than the second distance.
  • Figures 16 (A) to (E) are explanatory diagrams showing the relationship between the vertical position of the image forming element 101 and the vertical position of the effective area on the screen SR onto which all light rays are projected.
  • the first attachment optical system 11 is attached to the base optical system 10, and the image forming element 101 is positioned at a first position by the moving unit 120.
  • the vertical distance SF from the optical axis OA to the center of the length of the effective area in the first direction is set to SF1a (corresponding to the first distance).
  • the first attachment optical system 11 is attached to the base optical system 10, and the image forming element 101 is positioned at a second position farther from the optical axis OA than the first position by the moving unit 120.
  • the vertical distance SF of the effective area is set to SF1b (corresponding to the second distance) which is larger than SF1a (SF1a ⁇ SF1b).
  • the second attachment optical system 12 is attached to the base optical system 10, and the image forming element 101 is positioned to a first position by the moving unit 120.
  • the vertical distance SF of the effective area is set to SF2a (corresponding to a third distance).
  • the second attachment optical system 12 is attached to the base optical system 10, and the image forming element 101 is positioned to a second position farther from the optical axis OA than the first position by the moving unit 120.
  • the vertical distance SF of the effective area is set to SF2b (corresponding to a fourth distance) that is greater than SF2a (SF2a ⁇ SF2b).
  • SF2a third distance
  • SF2b fourth distance
  • SF1b second distance
  • the third distance is smaller than the second distance
  • the range in which the vertical distance is changed when the first attachment optical system is attached to the optical system and the range in which the vertical distance is changed when the second attachment optical system is attached to the optical system may partially overlap.
  • the vertical distance SF1 of the effective area can be adjusted in the range of SF1a to SF1b by adjusting the position of the image forming element 101.
  • the vertical distance SF2 of the effective area can be adjusted in the range of SF2a to SF2b by adjusting the position of the image forming element 101.
  • SF2a (third distance) may be set smaller than SF1b (second distance).
  • the vertical distance SF3 of the effective area can be adjusted in the range of SF3a to SF3b by adjusting the position of the image forming element 101.
  • SF3a may be set smaller than SF2b (fourth distance). This configuration allows the vertical distance of the projection range to be changed seamlessly, resulting in greater freedom in the layout design of the screen and image projection device.
  • the vertical distance when the nth attachment optical system is used may be equal to or greater than a length of a projected image in a first direction parallel to the vertical direction.
  • the vertical distance SF3 of the effective area can be set to be greater than the length V of the effective area in the first direction by adjusting the position of the image forming element 101.
  • the vertical distance of the projected image can be increased, and as a result, the degree of freedom in the layout design of the screen and the image projection device is increased.
  • the vertical distance SF3 when the third attachment optical system 13 is used is greater than the length V of the first direction parallel to the vertical direction of the projected image, but the vertical distance SF2 when the second attachment optical system 12 is used, or the vertical distance when the fourth to nth attachment optical systems are used, may be greater than the length V of the first direction parallel to the vertical direction of the projected image.
  • the change in the horizontal half angle of view of the light projected from the image forming element due to the replacement of the first attachment optical system with the second attachment optical system may be less than 2 degrees.
  • the optical system is disposed between a display surface of an image forming element disposed at the reduction conjugate point and a screen disposed at the magnification conjugate point onto which an image is projected, and the display surface and the screen may be parallel.
  • FIG. 18 is a block diagram showing an example of an imaging device according to the present disclosure.
  • the imaging device 200 includes the optical system 1 disclosed in the first embodiment, an imaging element 201, a control unit 210, and the like.
  • the imaging element 201 is composed of a CCD (charge-coupled device) image sensor, a CMOS image sensor, and the like, and receives an optical image of an object OBJ formed by the optical system 1 and converts it into an electrical image signal.
  • the control unit 110 is composed of a CPU or an MPU, and controls the entire device and each component.
  • the optical system 1 may be configured as an interchangeable lens that can be detachably attached to the imaging device 200, or may be configured as a built-in lens integrated into the imaging device 200.
  • the imaging device 200 described above uses the optical system 1 according to embodiment 1, making it possible to capture images in a short focal length and in a large diagonal direction perpendicular to the optical axis using a small device.
  • the components shown in the attached drawings and detailed description may include not only components essential for solving the problem, but also components that are not essential for solving the problem in order to illustrate the above technology. Therefore, the fact that these non-essential components are shown in the attached drawings or detailed description should not be used to immediately conclude that these non-essential components are essential.
  • This disclosure is applicable to image projection devices such as projectors and head-up displays, as well as imaging devices such as digital still cameras, digital video cameras, surveillance cameras in surveillance systems, web cameras, and vehicle-mounted cameras.
  • this disclosure is applicable to imaging optical systems that require high image quality, such as projectors, digital still camera systems, and digital video camera systems.

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PCT/JP2024/015387 2023-06-13 2024-04-18 光学系、画像投写装置および撮像装置 Ceased WO2024257479A1 (ja)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015022099A (ja) * 2013-07-18 2015-02-02 セイコーエプソン株式会社 プロジェクター
WO2019146080A1 (ja) * 2018-01-26 2019-08-01 マクセル株式会社 投写型映像表示装置
WO2021005711A1 (ja) * 2019-07-09 2021-01-14 マクセル株式会社 投射型映像表示装置
JP2022156602A (ja) * 2021-03-31 2022-10-14 セイコーエプソン株式会社 アタッチメント光学系、および投写表示システム

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015022099A (ja) * 2013-07-18 2015-02-02 セイコーエプソン株式会社 プロジェクター
WO2019146080A1 (ja) * 2018-01-26 2019-08-01 マクセル株式会社 投写型映像表示装置
WO2021005711A1 (ja) * 2019-07-09 2021-01-14 マクセル株式会社 投射型映像表示装置
JP2022156602A (ja) * 2021-03-31 2022-10-14 セイコーエプソン株式会社 アタッチメント光学系、および投写表示システム

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