WO2018117025A1 - Système optique d'observation et dispositif d'observation dudit système - Google Patents

Système optique d'observation et dispositif d'observation dudit système Download PDF

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Publication number
WO2018117025A1
WO2018117025A1 PCT/JP2017/045313 JP2017045313W WO2018117025A1 WO 2018117025 A1 WO2018117025 A1 WO 2018117025A1 JP 2017045313 W JP2017045313 W JP 2017045313W WO 2018117025 A1 WO2018117025 A1 WO 2018117025A1
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lens
fresnel lens
optical system
conditional expression
fresnel
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PCT/JP2017/045313
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English (en)
Japanese (ja)
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裕基 江部
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キヤノン株式会社
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Priority claimed from JP2017234844A external-priority patent/JP7086581B2/ja
Application filed by キヤノン株式会社 filed Critical キヤノン株式会社
Publication of WO2018117025A1 publication Critical patent/WO2018117025A1/fr
Priority to US16/445,526 priority Critical patent/US11487050B2/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
    • G02B25/00—Eyepieces; Magnifying glasses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/02—Viewing or reading apparatus

Definitions

  • the present invention relates to an observation optical system suitable for, for example, a head mounted display for displaying an enlarged original image displayed on an image display element such as liquid crystal and observing the same.
  • observation optical system Conventionally, an original image displayed using an image display element such as a CRT or an LCD is enlarged and displayed through the observation optical system, and a large screen image is given to the user, so that realistic observation can be performed.
  • An observation device such as a head mounted display has been proposed.
  • observation devices it has been desired that a higher sense of reality can be obtained, and for that reason, observation optical systems used in observation devices are required to be compatible with wide viewing angles and have high optical performance. ing.
  • the observation optical system when used in a head-mounted or hand-held type observation apparatus, it is required that the observation optical system be compact and lightweight.
  • an eyepiece image display apparatus in which a Fresnel lens is disposed in an optical path is known as an observation optical system which achieves a wide viewing angle and weight reduction (Patent Document 1).
  • a resin lens is used to reduce the weight of the observation optical system, and at this time, a diffractive lens structure is provided in the peripheral portion of the lens to suppress shift in focus due to temperature fluctuations of the resin lens.
  • An objective lens for a head is known (Patent Document 2).
  • a Fresnel lens having a sawtooth shape and having a concave surface directed to the observation side is disposed at a position closest to the eye (observation surface). And it is aiming at wide viewing angle and weight reduction of the whole system.
  • the Fresnel grating of the Fresnel lens according to Patent Document 1 has a tendency that the incident light becomes unnecessary light (ghost) when the light is incident on the molding defect (surface sag) or the like of the wall surface or the projection, and the image quality is deteriorated.
  • the Fresnel lens of Patent Document 1 forms a Fresnel surface from the central area of the Fresnel lens, the image quality of the observation image tends to be deteriorated in the central area of the observation screen where the observer can easily watch.
  • the objective lens of Patent Document 2 uses the central area of the lens as a lens surface of a continuous shape as a refractive action, and the peripheral part as a sawtooth-shaped diffractive lens configuration, utilizing a first-order diffraction action. In this way, it is intended to suppress the focus position shift due to the temperature change. Since the objective lens of Patent Document 2 is configured of a single lens, it tends to be difficult to obtain high optical performance.
  • the present invention is an observation optical system capable of observing image information displayed on an image display surface with high optical performance while having a wide viewing angle while achieving downsizing and weight reduction of the entire system, and observation having the same
  • the purpose is to provide a device.
  • the optical system according to the present invention has a Fresnel lens and a lens LP of positive refractive power provided on the light incident side or the light output side of the Fresnel lens, and the center annular zone from the vertex of the central annular zone of the Fresnel lens
  • h0 be the length in the optical axis direction to the end of the frame
  • h1 be the length in the optical axis direction of the grating wall surface of the first annular zone adjacent to the central annular zone, 0.01 ⁇ h1 / h0 ⁇ 0.80 It is characterized by satisfying the following conditional expression.
  • an observation optical system capable of observing image information displayed on an image display surface with high optical performance while having a wide viewing angle while achieving downsizing and weight reduction of the entire system, and the same An observation device is obtained.
  • FIG. 1 is a lens cross-sectional view of an observation apparatus having an observation optical system of Example 1 of the present invention.
  • the lens sectional view of the observation apparatus which has an observation optical system of Example 2 of this invention.
  • FIG. 7 is a longitudinal aberration diagram of the observation optical system of the second embodiment of the present invention at an eye relief of 20 mm.
  • the lens sectional view of the observation apparatus which has an observation optical system of Example 3 of this invention.
  • FIG. 7 is a longitudinal aberration diagram of the observation optical system of the Example 3 of the present invention at an eye relief of 10 mm.
  • FIG. 7 is a longitudinal aberration diagram of the observation optical system of Example 3 of the present invention at an eye relief of 20 mm.
  • the lens sectional view of the observation apparatus which has an observation optical system of Example 4 of this invention.
  • FIG. 7 is a longitudinal aberration diagram of the observation optical system of the fourth embodiment of the present invention at an eye relief of 10 mm.
  • FIG. 7 is a longitudinal aberration diagram of the observation optical system of the fourth embodiment of the present invention at an eye relief of 20 mm.
  • the lens sectional view of the observation apparatus which has an observation optical system of Example 5 of this invention.
  • FIG. 7 is a longitudinal aberration diagram at an eye relief of 10 mm of an observation optical system of Example 5 of the present invention.
  • FIG. 7 shows longitudinal aberration at eye relief of 20 mm of the observation optical system of Example 5 of the present invention.
  • the optical system of each embodiment is an observation optical system for observing an image displayed on the image display surface, and has a Fresnel lens LF and a lens (positive lens) LP of positive refractive power.
  • the Fresnel lens refers to an optical element having a Fresnel grating.
  • the surface shapes of the optical surface on the light incident side of the Fresnel lens and the optical surface on the light output side (when the optical surface has a Fresnel grating, it is a curved surface even if it is a flat surface) Also good.
  • the Fresnel lens has a curved optical surface
  • the curved optical surface is not limited to a spherical shape, and may be a free curved surface.
  • FIG. 1 is a lens cross-sectional view of an observation apparatus having an observation optical system of Example 1 of the present invention.
  • FIG. 2A and FIG. 2B are respectively longitudinal aberration diagrams at eye relief 10 mm and eye relief 20 mm of the observation optical system of Example 1 of the present invention.
  • FIG. 3 is a lens cross-sectional view of an observation apparatus having an observation optical system of Example 2 of the present invention.
  • FIG. 4A and FIG. 4B are respectively longitudinal aberration diagrams in eye relief 10 mm and eye relief 20 mm of the observation optical system of Example 2 of this invention.
  • FIG. 5 is a lens sectional view of an observation apparatus having an observation optical system according to a third embodiment of the present invention.
  • FIGS. 6A and 6B are respectively longitudinal aberration diagrams at an eye relief of 10 mm and an eye relief of 20 mm of the observation optical system of Example 3 of the present invention.
  • FIG. 7 is a lens cross-sectional view of an observation apparatus having an observation optical system of Example 4 of the present invention.
  • FIGS. 8A and 8B are respectively longitudinal aberration diagrams at an eye relief of 10 mm and an eye relief of 20 mm of the observation optical system of Example 4 of the present invention.
  • FIG. 9 is a lens cross-sectional view of an observation apparatus having an observation optical system of Example 5 of the present invention.
  • FIG. 10A and FIG. 10B are respectively longitudinal aberration diagrams in eye relief 10 mm and eye relief 20 mm of the observation optical system of Example 5 of this invention.
  • 11A and 11B illustrate the definition of the length in the optical axis direction from the surface vertex of the central ring zone of the Fresnel lens to the end of the central ring zone in the present specification and the length in the optical axis direction of the grating wall surface
  • FIG. 12A, 12B and 12C are explanatory views of a Fresnel lens.
  • L0 is an observation optical system, and has a lens (positive lens) LP of positive refractive power and a Fresnel lens LF.
  • Fre is a Fresnel surface of the Fresnel lens LF.
  • the positive lens LP is a positive lens having the largest refractive power when the observation optical system L0 has a plurality of positive lenses.
  • the positive lens LP is a curved surface having a curvature on the lens surface, and the curved surface is a refractive lens, and does not include a Fresnel lens.
  • ID is an image display surface, and, for example, a liquid crystal display element ID1 is disposed.
  • SP is a viewing plane, where the observer's pupil is located.
  • a stop (SP1) may be disposed on the observation surface SP.
  • the eye relief represents the distance between the eye point on the optical axis and the lens surface closest to the viewing surface SP.
  • Each aberration diagram shows, in order from the left, spherical aberration, astigmatism, distortion, and lateral chromatic aberration.
  • the spherical aberration diagrams show spherical aberration for d-line (wavelength 587.6 nm) and g-line (wavelength 435.8 nm).
  • S and M respectively indicate astigmatism on the sagittal image plane and the meridional image plane.
  • the distortion is shown for d-line.
  • the chromatic aberration diagram shows the chromatic aberration at the g-line.
  • the aberration on the viewing surface SP side where the light beam is blown from the image display surface ID and the aberration on the image display surface ID where the light beam is blown from the observation surface SP side correspond one to one.
  • the aberration at the image display surface ID is evaluated for convenience.
  • the aperture stop diameter of the stop SP1 of each embodiment is set to 3.5 mm as an example of the human pupil diameter.
  • the aberration diagrams typically show aberrations when the eye relief is 10 mm and the eye relief 20 mm.
  • Fre is a Fresnel surface, and a plurality of concentric Fresnel gratings FP are arranged at a predetermined grating pitch.
  • F0 is a central annular zone, is a continuous surface, and is formed of a spherical surface, an aspheric surface, and the like.
  • La is an optical axis.
  • ⁇ 1 is the effective diameter of the Fresnel lens LF.
  • ⁇ 0 is the effective diameter of the central annular zone F 0 of the Fresnel lens F 0. That is, it is the diameter from one end FL2 of the central annular zone F0 to the other end FL2.
  • Fr is a Fresnel ring zone in which a Fresnel grating is formed.
  • the nth Fresnel grating (a ring from the optical axis La in the direction of the optical axis La from the surface vertex FL1 to the end FL2 of the central annular zone F0 of the Fresnel lens LF)
  • the length of the wall of the band is hn.
  • the observation optical system L0 of the present invention has a positive lens LP and a Fresnel lens LF.
  • the observation optical system L0 is composed of a plurality of lenses.
  • the length in the optical axis direction from the surface vertex FL1 of the central annular zone F0 of the Fresnel lens LF to the end portion FL2 of the central annular zone F0 is h0.
  • Length in the optical axis direction of the grating wall surface of the first annular zone counted from the optical axis center of the Fresnel annular zone Fr of the Fresnel lens LF (optical axis of the grating wall surface of the first annular zone adjacent to the central annular zone F0
  • h1 be the length of the direction). At this time, 0.01 ⁇ h1 / h0 ⁇ 0.80 (1) Satisfy the following conditional expression.
  • the conditional expression (1) is the length h1 in the optical axis direction of the grating wall surface of the first annular zone of the Fresnel annular zone Fr of the Fresnel lens LF and the light from the surface vertex FL1 to the end FL2 of the central annular zone F0 of the Fresnel lens LF
  • the ratio of the axial length h0 is defined.
  • the length in the optical axis direction from the surface vertex FL1 to the end FL2 of the central annular zone F0 of the Fresnel lens LF is made larger than the length in the optical axis direction of the grating wall surface of the first annular zone of the Fresnel lens LF .
  • the ratio of the continuously shaped area (central annular zone) F0 in the radial direction of the Fresnel lens LF is increased, and the image quality deterioration factor due to the sawtooth shape of the Fresnel lens LF is reduced in the screen central area where the observer easily gazes To improve the optical performance.
  • the length in the optical axis direction from the surface vertex FL1 to the end FL2 of the central annular zone F0 becomes too long, and the weight increases.
  • the length in the optical axis direction of the grating wall surface of the first annular zone of the Fresnel lens LF becomes too short, flare due to diffraction increases, and optical performance deteriorates.
  • the refractive power of the Fresnel lens LF is strong, the length in the optical axis direction from the surface vertex FL1 to the end FL2 of the central annular zone F0 becomes too short. As a result, the sawtooth shape of the Fresnel lens LF is formed in the screen central area where the observer can easily gaze, and the optical performance is degraded. If the refractive power of the Fresnel lens LF is weak, the refractive powers of the other lenses that constitute it become too strong, and various off-axis aberrations increase.
  • the length in the optical axis direction of the grating wall surface of the first annular zone of the Fresnel lens LF becomes too long, the unnecessary light (ghost) reflected by the wall surface increases, and the optical performance is degraded.
  • the numerical range of the conditional expression (1) is set as follows. 0.02 ⁇ h1 / h0 ⁇ 0.65 (1a) More preferably, the numerical range of the conditional expression (1a) may be set as follows. 0.03 ⁇ h1 / h0 ⁇ 0.50 (1b) With the above configuration, an observation optical system having a wide field of view and high optical performance, and having a lightweight overall system is obtained.
  • the observation optical system L0 may satisfy the following conditional expression (2) instead of the above-mentioned conditional expression (1).
  • conditional expression (2) ⁇ 0 is the diameter of the central annular zone F0 of the Fresnel lens LF
  • ⁇ 1 is the effective diameter of the Fresnel lens LF.
  • Conditional expression (2) defines the ratio of the effective diameter (diameter) 0 0 of the central annular zone F 0 of the Fresnel lens LF to the effective diameter ⁇ 1 of the Fresnel lens LF.
  • the numerical range of the conditional expression (2) is set as follows. 0.32 ⁇ 0 / ⁇ 1 ⁇ 0.65 (2a) More preferably, the numerical range of the conditional expression (2a) may be set as follows. 0.34 ⁇ 0 / ⁇ 1 ⁇ 0.62 (2b)
  • the observation optical system L0 may satisfy both the conditional expression (1) and the conditional expression (2).
  • the focal length of the Fresnel lens LF is fh
  • the focal length of the observation optical system L0 is F.
  • the lens with the largest refractive power is a positive lens LP
  • the focal length of the positive lens LP is fp.
  • the distance on the optical axis from the lens surface on the observation surface side of the lens closest to the observation side to the lens surface on the image display surface side of the lens closest to the image display surface Let d be.
  • the distance on the optical axis from the lens surface on the observation surface side of the lens positioned closest to the observation surface side of the observation optical system L0 to the image display surface is L.
  • the curvature radius of the surface on the observation surface side of the Fresnel lens LF is Rp11
  • the curvature radius of the surface on the image display surface side of the Fresnel lens LF is Rp12.
  • the curvature radius of the surface on the observation surface side of the Fresnel lens LF is Rn11
  • the curvature radius of the surface on the image display surface side of the Fresnel lens LF is Rn12.
  • the curvature radius of the lens surface of the positive lens LP on the observation surface side is R21
  • the curvature radius of the lens surface of the positive lens LP on the image display surface side is R22.
  • the average value of the length in the optical axis direction of the grating wall surface in the effective surface of the Fresnel lens LF is set to have (mm), and the length of the wavelength of the d-line is set to ⁇ (mm).
  • the grating pitch of the first annular zone of the Fresnel lens LF is w1
  • the grating pitch of the outermost annular zone in the effective surface of the Fresnel lens LF is we.
  • the ideal image height of the image display surface at a half viewing angle of 45 degrees is 10 mm with an eye relief of 10 mm
  • the actual image height of the image display surface at a half viewing angle of 45 degrees is y with an eye relief of 10 mm.
  • the "actual image height y" is the height in the direction perpendicular to the optical axis at the paraxial imaging position of the chief ray incident on the observation optical system L0 at an eye relief of 10 mm and a half viewing angle of 45 degrees.
  • Conditional expression (3) defines the ratio of the focal length of the Fresnel lens LF to the focal length of the observation optical system L0. If the refractive power of the Fresnel lens LF is too strong (the absolute value of the refractive power is large) beyond the lower limit of the conditional expression (3), the grating pitch of each Fresnel grating forming the sawtooth shape becomes too fine. As a result, the angle at which diffracted light diffracts becomes too large, and flare increases.
  • conditional expression (3) if the upper limit of conditional expression (3) is exceeded, the refractive power of each lens becomes too strong when the number of other lenses being configured is small, and various off-axis aberrations increase. If the number of other lenses being configured is large, the weight of the entire system increases.
  • Condition (4) defines the ratio of the focal length of the positive lens LP to the focal length of the observation optical system L0. If the lower limit of the conditional expression (4) is exceeded, the refractive power of the positive lens LP becomes too strong, and mainly curvature of field and astigmatism increase. Conversely, if the upper limit of conditional expression (4) is exceeded, the refractive power of each lens becomes too strong when the number of other lenses being configured is small, and various off-axis aberrations increase. If the number of other lenses being configured is large, the weight of the entire system increases.
  • the conditional expression (5) is that of the positive lens LP and the Fresnel lens LF, from the lens surface on the observation surface side of the lens closest to the observation surface SP side to the image display surface side of the lens closest to the image display surface ID Assuming that the distance on the optical axis to the lens surface is d, the ratio of the distance from the lens surface on the viewing surface side of the lens closest to the viewing surface SP to the image display surface ID to the distance d is defined.
  • the distance between the lenses becomes too short, and it becomes difficult to mechanically hold each lens. Alternatively, the thickness of the lens is too thin, the lens surface is easily deformed, and the optical performance is easily reduced. Conversely, when the upper limit of conditional expression (5) is exceeded, the distance between lenses becomes too long, and the effective diameter of the lens positioned on the image display surface side becomes large, and the weight increases. Alternatively, the thickness of the lens becomes too thick and the weight increases.
  • Conditional expression (6) defines the form factor of the Fresnel lens LF when the Fresnel lens LF has positive refractive power. If the lower limit of the conditional expression (6) is exceeded, the curvature of the surface on the image display surface side of the Fresnel lens LF becomes too strong, and mainly the curvature of field and astigmatism increase. Conversely, when the upper limit of conditional expression (6) is exceeded, the curvature of the surface on the observation surface side of the Fresnel lens LF becomes too strong, and distortion mainly increases.
  • the conditional expression (7) defines the form factor of the Fresnel lens LF when the Fresnel lens LF has negative refractive power. If the lower limit of the conditional expression (7) is exceeded, the curvature of the surface on the image display surface side of the Fresnel lens LF becomes too strong, and field curvature and astigmatism mainly increase. On the contrary, when the upper limit of the conditional expression (7) is exceeded, the curvature of the surface on the observation surface side of the Fresnel lens LF becomes too strong, and mainly the field curvature and astigmatism increase.
  • Condition (8) defines the form factor of the positive lens LP. If the lower limit of the conditional expression (8) is exceeded, the curvature of the surface on the image display surface side of the positive lens LP becomes too strong, and field curvature and astigmatism mainly increase. Conversely, if the upper limit of conditional expression (8) is exceeded, the curvature of the surface on the observation surface side of the positive lens LP becomes too strong, and distortion mainly increases.
  • the conditional expression (9) defines the ratio of the average of the wall heights of the Fresnel grating in the effective system of the Fresnel lens LF to the length of the wavelength of the d-line. If the lower limit of the conditional expression (9) is exceeded, the wall height of the Fresnel grating in the effective system of the Fresnel lens LF becomes too small, the intensity of the diffracted light increases, and the optical performance decreases. Conversely, when the upper limit of conditional expression (9) is exceeded, the wall length of the Fresnel grating of the Fresnel lens LF becomes too long, unnecessary light (ghost) reflected by the wall increases, and the optical performance decreases. .
  • Conditional expression (10) defines the ratio of the grating pitch of the Fresnel grating in the first annular zone of the Fresnel lens LF to the grating pitch of the Fresnel grating in the outermost annular zone in the light beam effective diameter ⁇ 1 of the Fresnel lens LF ing. If the lower limit of conditional expression (10) is exceeded, the grating pitch of the Fresnel grating in the first orbicular zone becomes too small, the diffraction angle of light to be diffracted becomes too large, flare effects occur at the screen center, and optical performance It is falling.
  • Conditional expression (11) defines the distortion amount on the image display surface ID at an eye relief of 10 mm and a half viewing angle of 45 degrees. If the lower limit of the conditional expression (11) is exceeded, the positive refractive power is too strong, so light rays around the screen are strongly bent in the optical axis direction, and various off-axis aberrations increase. Conversely, if the upper limit of conditional expression (11) is exceeded, the positive refractive power is too small, so the incident height of the marginal rays at each lens position becomes too high, and the effective diameter increases, so the weight of the entire system increases. Do.
  • the conditional expression (12) is the actual image height of the chief ray at a half viewing angle of 45 degrees in the observation optical system L0 at an eye relief of 10 mm (the height in the direction perpendicular to the optical axis at the paraxial imaging position
  • the ratio of y) to the focal length F of the observation optical system L0 is defined. This represents the refractive power of the peripheral portion corresponding to the viewing angle of 45 degrees of the observation optical system L0. Since y becomes smaller as the refractive power of the peripheral portion becomes stronger, satisfying the conditional expression (12) makes it possible to widen the viewing angle while configuring the image display element in a small size.
  • the focal length F of the observation optical system L0 is too long beyond the lower limit of the conditional expression (12)
  • the total length of the observation optical system L0 is elongated and enlarged.
  • the refractive power at the periphery of the observation optical system becomes too strong, and in particular astigmatism and field curvature increase.
  • y exceeds the upper limit of the conditional expression (12) and y is too large, the image display surface becomes too large, and the image display element becomes large. According to the above-described configuration, it is possible to obtain an observation optical system which has high optical performance and a light whole system while having a wide field of view.
  • the numerical ranges of the conditional expressions (3) to (12) may be set as follows. 1.6 ⁇
  • the numerical ranges of the conditional expressions (3a) to (12a) may be set as follows. 1.7 ⁇
  • Example 1 of the observation optical system L0 of the present invention will be described below with reference to FIG.
  • the observation optical system L0 of Example 1 includes, in order from the observation surface side to the image display surface side, a Fresnel lens LF of positive refractive power and a lens (positive lens) LP of positive refractive power.
  • a Fresnel lens LF of positive refractive power By sharing the positive refractive power between the two lenses, the curvature on each surface is loosened, thereby reducing the occurrence of various aberrations.
  • the Fresnel lens LF of positive refractive power has the image display surface ID side as the Fresnel surface.
  • the length h0 in the optical axis direction from the surface vertex FL1 to the end portion FL2 of the central annular zone of the Fresnel lens LF is increased in an appropriate range that satisfies the conditional expression (1).
  • the ratio of the continuously shaped area in the radial direction of the Fresnel lens LF is increased, and the optical performance in the screen range in which the observer can easily gaze is improved.
  • the region of continuous shape is set within an appropriate range satisfying the conditional expression (2), and the optical performance is improved and the weight is reduced.
  • the focal length of the Fresnel lens LF is loosened in an appropriate range satisfying the conditional expression (3) to prevent the grating pitch of the Fresnel grating from becoming too small, and flare due to diffraction is reduced.
  • the focal length of the positive lens LP is reduced within an appropriate range that satisfies the conditional expression (4) to mainly reduce the occurrence of field curvature and astigmatism.
  • the weight reduction of the entire system is achieved by reducing the thickness of each of the Fresnel lens LF and the positive lens LP within an appropriate range that satisfies the conditional expression (5).
  • the curvature of the surface on the image display surface side is intensified relative to the curvature of the surface on the observation surface SP side of the Fresnel lens LF, and the convex shape is directed to the image display surface side.
  • the observation surface SP the incident angle of the off-axis light beam is relaxed, and the occurrence of various off-axis aberrations is reduced.
  • the curvature of the surface on the image display surface ID side is intensified with respect to the curvature of the surface on the observation surface SP side of the positive lens LP so as to satisfy the conditional expression (8), and the convex shape is directed to the image display surface ID.
  • the convex shape is directed to the image display surface ID.
  • it has a concentric shape with respect to the viewing surface SP.
  • the grating pitch of the Fresnel grating in the first annular zone of the Fresnel lens LF and the grating pitch of the Fresnel grating in the outermost annular zone in the light beam effective diameter 11 are set so as to satisfy the conditional expression (10) This prevents the generation of diffracted light on the entire screen and improves optical performance.
  • Example 2 of the observation optical system L0 of the present invention will be described below with reference to FIG.
  • the observation optical system L0 of Example 2 includes, in order from the observation surface side to the image display surface side, a lens of positive refractive power (positive lens) LP, a lens of negative refractive power (negative lens) L3, and positive refractive power. It comprises a Fresnel lens LF. By sharing the positive refractive power between the two lenses, the curvature on each surface is relaxed, thereby reducing the occurrence of various aberrations.
  • Example 3 of the observation optical system L0 of the present invention will be described below with reference to FIG.
  • the observation optical system L0 of Example 3 includes, in order from the observation surface side to the image display surface side, a parallel flat plate (optical member) Lt, a lens of positive refractive power (positive lens) LP, and a Fresnel lens LF of positive refractive power. It is configured. If the positive lens LP is in the exposed (exposed to the outside) state, the lens may be deformed or cracked if oil or the like is touched.
  • the flat lens Lt plays a role of protecting the positive lens LP.
  • the Fresnel lens LF of positive refractive power is arranged at the position closest to the image display surface, that is, the position where the effective diameter becomes large among the three lenses described above, weight reduction of the entire system is achieved. .
  • the other configuration is the same as that of the first embodiment.
  • Example 4 of the observation optical system L0 of the present invention will be described below with reference to FIG.
  • the observation optical system L0 of Example 4 includes, in order from the observation surface side to the image display surface side, a Fresnel lens LF of negative refractive power, a lens (positive lens) LP of positive refractive power, and a lens L3 of positive refractive power. It is configured. By sharing the positive refractive power between the two lenses, the curvature on each surface is relaxed, thereby reducing the occurrence of various aberrations. In addition, the chromatic aberration of magnification and the curvature of field are reduced by disposing the Fresnel lens LF of negative refractive power.
  • the curvature of the surface on the observation surface side is intensified with respect to the curvature of the surface on the image display surface side of the Fresnel lens LF, and the concave shape is directed to the observation surface SP.
  • the incident angle of the off-axis light beam is relaxed in a concentric form with respect to the observation surface SP, and the occurrence of various off-axis aberrations is reduced.
  • the other configuration is the same as that of the first embodiment.
  • Example 5 of the observation optical system L0 of the present invention will be described below with reference to FIG.
  • the observation optical system L0 of Example 5 includes, in order from the observation surface side to the image display surface side, a lens of positive refractive power (positive lens) LP, a Fresnel lens of negative refractive power LF, a lens of positive refractive power (positive
  • the lens L3 is composed of a lens (positive lens) L4 of positive refractive power.
  • the curvature of the surface on the observation surface side is increased relative to the curvature of the surface on the image display surface side of the Fresnel lens LF, and the concave shape is directed to the observation surface SP. It is in the form of a concentric form for the SP. As a result, the incident angle of the off-axis ray is relaxed and the occurrence of off-axis aberrations is reduced.
  • the other configuration is the same as that of the first embodiment.
  • a Fresnel lens has a shape in which a lens surface having a radius of curvature r is divided into a plurality of concentric regions.
  • the cross-sectional shape is a shape in which a Fresnel grating (prism) FP having a sawtooth shape is arranged concentrically on a plane.
  • the plurality of concentric Fresnel gratings have different or identical angles.
  • the grating pitch of the Fresnel grating is different or identical from the center (optical axis) to the periphery.
  • the radius of curvature r at the Fresnel lens surface Fre corresponds to the radius of curvature r of the lens surface shown in FIG. 12A.
  • One of the parameters for determining the focal length of the Fresnel lens surface uses the radius of curvature r as in the case of determining the focal length of a normal lens.
  • the focal length f of the Fresnel lens, the plate thickness (center thickness), the effective diameter 11, etc. are as shown in FIGS. 12B and 12C.
  • the radius of curvature of the Fresnel lens surface in the conditional expression to be described later uses the radius of curvature of the lens surface before forming the Fresnel shape (that is, the radius of curvature of the central annular zone).
  • i indicates the order of the surface from the observation surface
  • ri indicates the radius of curvature of the i-th optical surface
  • di indicates the lens thickness and air gap between the i-th surface and the (i + 1) -th surface
  • ni, ii Represents the refractive index and Abbe number of the optical member between the i-th surface and the (i + 1) -th surface with respect to the d-line, respectively.
  • K, A4, A6, A8, A10, etc. described on the aspheric surface are aspheric coefficients.
  • the aspheric surface shape is defined by the following equation when the displacement in the optical axis direction at the position of height h from the optical axis is x with respect to the surface vertex.
  • x (h 2 / R) / [1 + ⁇ 1-(1 + K) (h / R) 2 ⁇ 1/2 ] + A4h 4 + A6h 6 + A8h 8 + A10h 10
  • R is a curvature radius here.
  • the Fresnel surface represents an ideal thin-walled state having an aspheric effect, and the actual shape is a Fresnel shape within the written center thickness d.
  • the Fresnel surface is described as * Fre next to the surface number. In the surface numbers of each numerical data, 1 corresponds to the observation surface (aperture), and the image surface corresponds to the image display surface.
  • the surface numbers 2 and 3 correspond to the Fresnel lens LF, and the surface numbers 4 and 5 correspond to the positive lens LP.
  • the surface numbers 2 and 3 correspond to the positive lens LP
  • the surface numbers 6 and 7 correspond to the Fresnel lens LF.
  • the surface numbers 4 and 5 correspond to the positive lens LP
  • the surface numbers 6 and 7 correspond to the Fresnel lens LF.
  • the surface numbers 2 and 3 correspond to the Fresnel lens LF
  • the surface numbers 4 and 5 correspond to the positive lens LP.
  • the surface numbers 2 and 3 correspond to the positive lens LP
  • the surface numbers 4 and 5 correspond to the Fresnel lens LF.
  • the total lens length is the distance from the first lens surface on the viewing surface side to the image display surface ID.
  • BF is a distance from the surface of the image display surface ID to the image display surface.
  • Tables 1 and 2 show the relationship between parameters based on the above-mentioned numerical data and each conditional expression.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

Un système optique d'observation selon la présente invention comprend une lentille de Fresnel, et une lentille LP ayant une réfringence positive et disposée sur le côté d'incidence de lumière ou le côté d'émission de lumière de la lentille de Fresnel, la longueur dans une direction d'axe optique d'un sommet de surface d'une zone centrale de la lentille de Fresnel à une extrémité de la zone centrale de celle-ci étant désignée par h0, la longueur dans la direction de l'axe optique d'une surface de paroi de réseau d'une première zone adjacente à la zone centrale est désignée par h1, et les deux longueurs sont réglées de manière appropriée.
PCT/JP2017/045313 2016-12-21 2017-12-18 Système optique d'observation et dispositif d'observation dudit système WO2018117025A1 (fr)

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JP7285263B2 (ja) 2018-08-28 2023-06-01 株式会社ソニー・インタラクティブエンタテインメント 接眼光学系及び画像観察装置
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WO2020166390A1 (fr) * 2019-02-14 2020-08-20 キヤノン株式会社 Système optique d'observation et dispositif d'affichage d'image associé
JP7218202B2 (ja) 2019-02-14 2023-02-06 キヤノン株式会社 観察光学系およびそれを備えた画像表示装置
JP7474124B2 (ja) 2019-06-26 2024-04-24 中強光電股▲ふん▼有限公司 光学レンズアセンブリ及びヘッドマウント式表示装置

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