WO2022044675A1 - 観察光学系および光学装置 - Google Patents

観察光学系および光学装置 Download PDF

Info

Publication number
WO2022044675A1
WO2022044675A1 PCT/JP2021/027945 JP2021027945W WO2022044675A1 WO 2022044675 A1 WO2022044675 A1 WO 2022044675A1 JP 2021027945 W JP2021027945 W JP 2021027945W WO 2022044675 A1 WO2022044675 A1 WO 2022044675A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
display element
optical system
observation optical
diopter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/027945
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
広樹 斉藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Corp
Original Assignee
Fujifilm Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujifilm Corp filed Critical Fujifilm Corp
Priority to CN202180051935.0A priority Critical patent/CN116113863A/zh
Priority to JP2022545571A priority patent/JP7518177B2/ja
Publication of WO2022044675A1 publication Critical patent/WO2022044675A1/ja
Priority to US18/169,717 priority patent/US20230194852A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B25/00—Eyepieces; Magnifying glasses
    • G02B25/001—Eyepieces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/004—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having four lenses
    • 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
    • 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
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/017—Head mounted
    • G02B27/0172—Head mounted characterised by optical features

Definitions

  • This disclosure relates to an observation optical system and an optical device.
  • the present disclosure has been made in view of the above circumstances, and provides an observation optical system capable of observing with a wider viewing angle while having good performance, and an optical device provided with this observation optical system.
  • the purpose is to provide an observation optical system capable of observing with a wider viewing angle while having good performance, and an optical device provided with this observation optical system. The purpose.
  • the observation optical system includes a display element and an eyepiece lens arranged on the eyepoint side of the display element, and the eyepieces are continuously continuous from the display element side to the eyepoint side.
  • the first lens having a positive refractive power, the second lens having a negative refractive power, and the third lens are included, and the half value of the longest diameter of the display region in the display element is H, and the diopter is -1 diopter.
  • At least three lenses in the eyepiece move along the optical axis when adjusting the diopter.
  • the lens surface on the display element side of the first lens has a shape in which the negative refractive power becomes stronger as the distance from the optical axis increases, or a shape in which the positive refractive power becomes weaker as the distance from the optical axis increases.
  • the lens surface on the eye point side of the second lens has a shape in which the positive refractive power becomes stronger as the distance from the optical axis increases, or a shape in which the negative refractive power becomes weaker as the distance from the optical axis increases.
  • the eyepiece may be configured to consist of four or more lenses.
  • the eyepiece may be configured to consist of four lenses.
  • the observation optical system of the above aspect preferably satisfies at least one of the following conditional expressions (1) to (25) and (1-1) to (6-1). 0.35 ⁇ H / f ⁇ 0.6 (1) 0.03 ⁇ (R2r + R2f) / (R2r-R2f) ⁇ 0.9 (2) -0.13 ⁇ (R2f-R1r) / (R2f + R1r) ⁇ 0.2 (3) -5 ⁇ (R1r + R1f) / (R1r-R1f) ⁇ -0.2 (4) -2.5 ⁇ (R3r + R3f) / (R3r-R3f) ⁇ 8 (5) 1.61 ⁇ Nmax ⁇ 2.2 (6) -4 ⁇ f / f2 ⁇ -0.9 (7) -1 ⁇ f / f12 ⁇ 0.12 (8) 0.83 ⁇ f / fr ⁇ 2 (9) -2.2 ⁇ f1 / f2 ⁇ -0.73 (10) 0.66 ⁇ f1 / fr ⁇
  • Air conversion distance on the axis d12 Distance on the optical axis from the surface on the eye point side of the first lens to the surface on the display element side of the second lens in the state where the diopter is -1 diopter d2: Light of the second lens Axial thickness dL: Distance on the optical axis from the surface on the display element side of the first lens to the lens surface on the most eye point side of the eyepiece lens in the state of diopter -1 diopter dL12: Diopter -1 diopter Distance on the optical axis from the surface on the display element side of the first lens to the surface on the eye point side of the second lens in the state of T2: The first lens from the display surface of the display element in the state where the diopter is -1 diopter.
  • TL Diopter of the sum of the air conversion distance on the optical axis to the surface on the display element side of the first lens and the distance on the optical axis from the surface on the display element side of the first lens to the surface on the eye point side of the second lens. Is the air conversion distance on the optical axis from the display surface of the display element to the surface of the first lens on the display element side in the state of -1 diopter, and the most eye point of the eyepiece lens from the surface of the first lens on the display element side. Sum Nmax with the distance on the optical axis to the side lens surface: The maximum value of the refractive index of all the lenses included in the eyepiece lens with respect to the d-line.
  • the optical device includes the observation optical system of the above aspect.
  • Consisting of and “consisting of” in the present specification refer to lenses having substantially no refractive power other than the listed components, and lenses such as an aperture, a filter, and a cover glass. It is intended that optical elements other than the above, as well as a lens flange, a lens barrel, and the like may be included.
  • a lens having a positive refractive power and “a positive lens” are synonymous.
  • “Lens with negative refractive power” and “negative lens” are synonymous.
  • “Single lens” means a single lens that is not joined.
  • a compound aspherical lens a lens in which a spherical lens and an aspherical film formed on the spherical lens are integrally formed and function as one aspherical lens as a whole
  • a bonded lens is a bonded lens. Is not considered and is treated as a single lens.
  • the sign of refractive power, radius of curvature and surface shape of a lens including an aspherical surface will be considered in the paraxial region.
  • the sign of the radius of curvature of the surface having the convex surface facing the display element side is positive, and the sign of the radius of curvature of the surface having the convex surface facing the eye point side is negative.
  • the "focal length” used in the conditional expression is the paraxial focal length.
  • the value used in the conditional expression is a value when the d line is used as a reference.
  • the "d-line”, “C-line”, and “F-line” described herein are emission lines, with a d-line wavelength of 587.56 nm (nanometers) and a C-line wavelength of 656.27 nm (nanometers). ), The wavelength of the F line is 486.13 nm (nanometers).
  • an observation optical system capable of observing with a wider viewing angle while having good performance
  • an optical device provided with this observation optical system.
  • FIG. 3 is a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a chromatic aberration of magnification diagram of the observation optical system of the first embodiment. It is a lateral aberration diagram of the observation optical system of Example 1.
  • FIG. 2 is a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a chromatic aberration of magnification diagram of the observation optical system of the second embodiment.
  • FIG. 2 It is a lateral aberration diagram of the observation optical system of Example 2.
  • FIG. 3 is a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a chromatic aberration of magnification diagram of the observation optical system of the third embodiment.
  • FIG. 4 is a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a chromatic aberration of magnification diagram of the observation optical system of the fourth embodiment.
  • FIG. 4 is a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a chromatic aberration of magnification diagram of the observation optical system of the fourth embodiment.
  • FIG. 7 is a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a chromatic aberration of magnification diagram of the observation optical system of the seventh embodiment. It is a lateral aberration diagram of the observation optical system of Example 7. It is a perspective view of the back side of the optical apparatus which concerns on one Embodiment.
  • FIG. 1 shows the configuration of the observation optical system 5 according to the embodiment of the present disclosure.
  • FIG. 2 shows the configuration and the luminous flux of the observation optical system 5.
  • FIG. 2 illustrates an axial luminous flux and a luminous flux having a maximum viewing angle as the luminous flux.
  • the examples shown in FIGS. 1 and 2 correspond to the first embodiment described later.
  • the left side is shown as the display element side, and the right side is shown as the eye point side.
  • the EPs of FIGS. 1 and 2 do not show the shape but the position in the optical axis direction.
  • the observation optical system 5 includes a display element 1 and an eyepiece 3 arranged on the eye point side of the display element 1.
  • the display element 1 is an element that displays an image.
  • the display element 1 includes a display area 1a on which an image is displayed. Examples of the display element 1 include a liquid crystal display element, an organic EL (organic electroluminescence) display element, and the like.
  • the display element 1 and the eyepiece lens 3 are arranged with a predetermined air spacing. This makes it possible to secure an interval for diopter adjustment.
  • the display element 1 is an example of an observation object, and the eyepiece 3 is used for observing an image displayed in the display area 1a of the display element 1. That is, the observation optical system 5 is configured to observe the image displayed on the display element 1 via the eyepiece lens 3.
  • FIG. 1 shows an example in which the optical member 2 is arranged between the display element 1 and the eyepiece lens 3, and the optical member 4 is arranged between the eyepiece lens 3 and the eye point EP. Both the optical member 2 and the optical member 4 are parallel plate-shaped members having no refractive power, and are assumed to be a protective cover glass or various filters. In the technique of the present disclosure, a configuration in which at least one of the optical member 2 and the optical member 4 is excluded is also possible.
  • the eyepiece 3 has a first lens L1 having a positive refractive power, a second lens L2 having a negative refractive power, and a second lens L2 having a positive refractive power continuously in order from the display element side to the eye point side along the optical axis Z. It is configured to include the three lenses L3.
  • the eyepiece 3 is configured to be composed of three or more lenses, which is advantageous for good aberration correction. It is preferable that each of the above three lenses is a single lens. According to such a configuration, the degree of freedom in design can be increased, which is advantageous for correcting various aberrations and also for obtaining a wider viewing angle.
  • the eyepiece 3 is composed of four or more lenses. In this case, it is advantageous to satisfactorily correct the overall aberration.
  • the eyepiece 3 of FIG. 1 includes a first lens L1 having a positive refractive power, a second lens L2 having a negative refractive power, and a third lens L3 in order from the display element side to the eye point side. It consists of a fourth lens L4.
  • the eyepiece 3 is configured to be composed of four lenses, it is advantageous to reduce the number of lenses and to make the eyepiece compact while satisfactorily correcting the overall aberration. All four lenses constituting the eyepiece 3 of FIG. 1 are single lenses, and are arranged on the optical axis with an air gap from the adjacent lenses. With this configuration, the degree of freedom in design can be increased, which is advantageous for correcting various aberrations and also for obtaining a wider viewing angle.
  • At least three lenses in the eyepiece move along the optical axis Z when adjusting the diopter. In this case, it is advantageous to suppress aberration fluctuations during diopter adjustment.
  • the four lenses of the first lens L1 to the fourth lens L4 move integrally when the diopter is adjusted.
  • integral movement means moving in the same direction and the same amount at the same time.
  • the eyepiece 3 may be configured to include an aspherical lens.
  • the lens surface on the display element side of the first lens L1 may have a shape in which the negative refractive power becomes stronger as the distance from the optical axis Z increases, or a shape in which the positive refractive power becomes weaker as the distance from the optical axis Z increases. preferable. In this case, it is advantageous to correct the distortion.
  • the lens surface on the eye point side of the second lens L2 may have a shape in which the positive refractive power becomes stronger as the distance from the optical axis Z increases, or a shape in which the negative refractive power becomes weaker as the distance from the optical axis Z increases. preferable. In this case, it is advantageous to correct the chromatic aberration of magnification.
  • the observation optical system 5 preferably satisfies at least one of the following conditional expressions (1) to (25). 0.35 ⁇ H / f ⁇ 0.6 (1) 0.03 ⁇ (R2r + R2f) / (R2r-R2f) ⁇ 0.9 (2) -0.13 ⁇ (R2f-R1r) / (R2f + R1r) ⁇ 0.2 (3) -5 ⁇ (R1r + R1f) / (R1r-R1f) ⁇ -0.2 (4) -2.5 ⁇ (R3r + R3f) / (R3r-R3f) ⁇ 8 (5) 1.61 ⁇ Nmax ⁇ 2.2 (6) -4 ⁇ f / f2 ⁇ -0.9 (7) -1 ⁇ f / f12 ⁇ 0.12 (8) 0.83 ⁇ f / fr ⁇ 2 (9) -2.2 ⁇ f1 / f2 ⁇ -0.73 (10) 0.66 ⁇ f1 / fr ⁇ 1.6 (11)
  • Air conversion distance on the axis d12 Distance on the optical axis from the surface on the eye point side of the first lens to the surface on the display element side of the second lens in the state where the diopter is -1 diopter d2: Light of the second lens Axial thickness dL: Distance on the optical axis from the surface on the display element side of the first lens to the lens surface on the most eye point side of the eyepiece lens in the state of diopter -1 diopter dL12: Diopter -1 diopter Distance on the optical axis from the surface on the display element side of the first lens to the surface on the eye point side of the second lens in the state of T2: The first lens from the display surface of the display element in the state where the diopter is -1 diopter.
  • TL Diopter of the sum of the air conversion distance on the optical axis to the surface on the display element side of the first lens and the distance on the optical axis from the surface on the display element side of the first lens to the surface on the eye point side of the second lens. Is the air conversion distance on the optical axis from the display surface of the display element to the surface of the first lens on the display element side in the state of -1 diopter, and the most eye point of the eyepiece lens from the surface of the first lens on the display element side. Sum Nmax with the distance on the optical axis to the side lens surface: The maximum value of the refractive index of all the lenses included in the eyepiece lens with respect to the d-line.
  • the "longest diameter of the display region in the display element" with respect to H is the point in the display region 1a whose center of gravity coincides with the optical axis Z and the point farthest from the optical axis Z in the radial direction and the optical axis Z. It means a value that is twice the distance.
  • the length of half the diagonal line of the display area 1a can be H.
  • the radius of the display area 1a can be H, and when the display area 1a is an ellipse, the longest diameter (major diameter) of the diameter of the display area 1a.
  • Half can be H.
  • the display area 1a means an area where an image is actually displayed.
  • the display element 1 includes a display unit having an aspect ratio of 4: 3 in which a plurality of pixels are arranged and displays an image having an aspect ratio of 3: 2 in a part of the display unit
  • the display area 1a is , Refers to the area where an image with an aspect ratio of 3: 2 is displayed. Therefore, the diameter of the display element 1 and the longest diameter of the display area 1a do not always match.
  • conditional expression (1) It is advantageous to obtain a wide viewing angle by not falling below the lower limit of the conditional expression (1). By not exceeding the upper limit of the conditional expression (1), it is advantageous to suppress aberrations such as curvature of field.
  • the refraction of light rays on the surface of the second lens L2 on the eye point side does not become too strong, which is advantageous in suppressing chromatic aberration of magnification.
  • the refraction of light rays on the surface of the second lens L2 on the display element side does not become too strong, which is advantageous in suppressing curvature of field.
  • the refraction of the surface of the second lens L2 on the display element side becomes stronger than the refraction of the off-axis light rays on the surface of the first lens L1 on the eye point side. Since it does not go too far, it is possible to prevent the chromatic aberration of magnification from being overcorrected.
  • the refraction of the surface of the second lens L2 on the display element side becomes weaker than the refraction of the off-axis light rays on the surface of the first lens L1 on the eye point side. Since it does not go too far, it is possible to prevent the chromatic aberration of magnification from becoming insufficiently corrected.
  • the refraction of the off-axis light rays on the surface of the first lens L1 on the eye point side does not become too strong, which is advantageous for correcting coma aberration.
  • the positive refractive power of the surface of the first lens L1 on the display element side does not become too strong, or the surface of the first lens L1 on the display element side. Since the negative refractive power does not become too weak, it is advantageous to suppress barrel-shaped distortion.
  • the positive refractive power of the surface of the third lens L3 on the display element side does not become too strong, or the surface of the third lens L3 on the display element side. Since the negative refractive power does not become too weak, it is advantageous for correcting curvature of field.
  • conditional expression (6) By making sure that the value does not fall below the lower limit of the conditional expression (6), it is possible to suppress an increase in the Petzval sum, which is advantageous for correcting curvature of field. By not exceeding the upper limit of the conditional expression (6), it is possible to prevent the material that can be selected as the lens material from being limited to a material having a small Abbe number, which is advantageous for correcting chromatic aberration. Further, by not exceeding the upper limit of the conditional expression (6), it is possible to contribute to the improvement of productivity when processing the material.
  • conditional expressions (1) to (25) are in the range of the following conditional expressions (1-1) to (25-1), respectively. 0.37 ⁇ H / f ⁇ 0.5 (1-1) 0.06 ⁇ (R2r + R2f) / (R2r-R2f) ⁇ 0.65 (2-1) -0.09 ⁇ (R2f-R1r) / (R2f + R1r) ⁇ 0.14 (3-1) -3 ⁇ (R1r + R1f) / (R1r-R1f) ⁇ -0.4 (4-1) -1.5 ⁇ (R3r + R3f) / (R3r-R3f) ⁇ 5 (5-1) 1.66 ⁇ Nmax ⁇ 2 (6-1) -3 ⁇ f / f2 ⁇ -1.15 (7-1) -0.7 ⁇ f / f12 ⁇ 0.03 (8-1) 0.96 ⁇ f / fr ⁇ 1.75 (9-1) -1.9 ⁇ f1
  • conditional expressions (1) to (25) are in the range of the following conditional expressions (1-2) to (25-2), respectively. 0.38 ⁇ H / f ⁇ 0.45 (1-2) 0.08 ⁇ (R2r + R2f) / (R2r-R2f) ⁇ 0.45 (2-2) -0.06 ⁇ (R2f-R1r) / (R2f + R1r) ⁇ 0.09 (3-2) -1.85 ⁇ (R1r + R1f) / (R1r-R1f) ⁇ -0.55 (4-2) -0.87 ⁇ (R3r + R3f) / (R3r-R3f) ⁇ 2.5 (5-2) 1.7 ⁇ Nmax ⁇ 1.9 (6-2) -2.5 ⁇ f / f2 ⁇ -1.41 (7-2) -0.5 ⁇ f / f12 ⁇ -0.03 (8-2) 1.11 ⁇ f / fr ⁇ 1.6 (9-2)
  • an observation optical system of a preferred embodiment in which the above-described configurations are combined includes a display element 1 and an eyepiece 3 arranged on the eye point side of the display element 1, and the eyepiece 3 is located from the most display element side.
  • the condition equation (1) is satisfied by including the first lens L1 having a positive refractive power, the second lens L2 having a negative refractive power, and the third lens L3 continuously in order toward the eye point side.
  • observation optical systems for viewfinders such as digital cameras
  • the number of pixels in liquid crystal display elements has increased recently, so a wider viewing angle and higher resolution performance are required.
  • various aberrations such as curvature of field and chromatic aberration of magnification occur greatly, and it is difficult to achieve both high resolution performance. Therefore, by adopting the above-mentioned preferable aspect, it is possible to realize an observation optical system capable of observing with a wider viewing angle while suppressing various aberrations such as curvature of field and chromatic aberration of magnification.
  • the configuration of the observation optical system 5 of the first embodiment is shown in FIG. 1, and the method and configuration thereof are as described above. Therefore, some duplication will be omitted here.
  • the eyepiece 3 included in the observation optical system 5 of the first embodiment is composed of four lenses, a first lens L1 to a fourth lens L4, in order from the display element side to the eye point side.
  • the first lens L1 is a biconvex positive lens in the paraxial region
  • the second lens L2 is a biconcave negative lens in the paraxial region
  • the third lens L3 is concave on the display element side in the paraxial region.
  • the fourth lens L4 is a positive lens having a biconvex shape in the paraxial region. All of the first lens L1 to the fourth lens L4 are single lenses. Both sides of the first lens L1 to the fourth lens L4 are aspherical. At the time of diopter adjustment, the four lenses of the first lens L1 to the fourth lens L4 move integrally.
  • the surface of the display element 1 on the observation object side (the surface on which the display area 1a is arranged) is set as the first surface, and the numbers are increased one by one toward the eye point side.
  • the surface number of each surface of the case is shown.
  • the display element 1, the optical member 2, the optical member 4, and the eye point EP are also described, and the surface number and the phrase (EP) are described in the Sn column of the surface corresponding to the eye point EP. is doing.
  • the column of R indicates the radius of curvature of each surface, and the sign of the radius of curvature is positive for a surface shape with a convex surface facing the display element side and negative for a surface shape with a convex surface facing the eye point side.
  • the surface numbers of the aspherical surface are marked with *, and the numerical value of the radius of curvature of the near axis is described in the column of the radius of curvature of the aspherical surface.
  • the surface spacing on the optical axis between each surface and the surface adjacent to the eye point side is shown, and the variable surface spacing at the time of diopter adjustment is referred to as DD [].
  • the surface number on the display element side of this interval is added in [].
  • the column of Nd indicates the refractive index of each component with respect to the d line.
  • the Abbe number based on the d-line of each component is shown.
  • Table 2 shows the focal length f of the eyepiece 3 at each diopter and the values of the viewing angle at all angles of view. “Dpt” in Tables 2 and 3 means diopter. [°] in the viewing angle column means that the unit is degrees. Table 2 also shows the half value H of the longest diameter of the display region 1a in the display element 1.
  • Table 3 shows the values of the variable surface spacing at each diopter.
  • the observation optical system 5 of the first embodiment can adjust the diopter in the range of -4 dpt to +2 dpt by integrally moving the eyepiece 3 in the optical axis direction.
  • KA and Am are aspherical coefficients in the aspherical expression expressed by the following equation.
  • Zd C ⁇ h 2 / ⁇ 1 + (1-KA ⁇ C 2 ⁇ h 2 ) 1/2 ⁇ + ⁇ Am ⁇ h m
  • Zd Aspherical depth (length of a perpendicular line drawn from a point on the aspherical surface at height h to a plane perpendicular to the optical axis where the aspherical apex touches)
  • h Height (distance from the optical axis to the lens surface)
  • C The reciprocal of the radius of curvature of the near axis KA
  • Am the aspherical coefficient
  • the aspherical ⁇ means the sum with respect to m.
  • FIG. 3 and 4 show each aberration diagram of the observation optical system 5 of the first embodiment in the state where the diopter is ⁇ 1.00 diopter (diopter).
  • spherical aberration, astigmatism, distortion, and chromatic aberration of magnification are shown in order from the left.
  • the aberrations on the d-line, C-line, and F-line are shown by solid lines, long dashed lines, and short dashed lines, respectively.
  • the aberration on the d-line in the sagittal direction is shown by a solid line
  • the aberration on the d-line in the tangential direction is shown by a short dashed line.
  • the aberration on the d line is shown by a solid line.
  • the aberrations in the C line and the F line are shown by a long broken line and a short broken line, respectively.
  • the unit dpt on the horizontal axis of the spherical aberration diagram and the astigmatism diagram means diopter.
  • ⁇ in the spherical aberration diagram means the diameter of the eye point EP when the unit is mm (millimeter), and ⁇ in the other aberration diagrams means the viewing angle at a half angle of view.
  • FIG. 4 for each viewing angle, the lateral aberration in the tangential direction is shown in the left column, and the lateral aberration in the sagittal direction is shown in the right column.
  • the aberrations on the d-line, C-line, and F-line are shown by solid lines, long dashed lines, and short dashed lines, respectively.
  • ⁇ in FIG. 4 means a viewing angle at a half angle of view.
  • Example 2 The configuration of the observation optical system of Example 2 is shown in FIG.
  • the observation optical system of the second embodiment includes a display element 1, an optical member 2, an eyepiece 3, and an optical member 4 in this order from the display element side to the eye point side.
  • the eyepiece 3 is composed of four lenses, the first lens L1 to the fourth lens L4, in order from the display element side to the eye point side.
  • the first lens L1 is a meniscus-shaped positive lens with a concave surface facing the display element side in the paraxial region
  • the second lens L2 is a biconcave negative lens in the paraxial region
  • the third lens L3 is biconvex. It is a positive lens having a shape
  • the fourth lens L4 is a positive lens having a biconvex shape in the paraxial region. All of the first lens L1 to the fourth lens L4 are single lenses. Both sides of the first lens L1, the second lens L2, and the fourth lens L4 are aspherical surfaces. At the time of diopter adjustment, the four lenses of the first lens L1 to the fourth lens L4 move integrally.
  • the basic lens data is shown in Table 5
  • the specifications are shown in Table 6
  • the variable surface spacing is shown in Table 7
  • the aspherical coefficient is shown in Table 8
  • the aberration diagrams are shown in FIGS. 6 and 7. show.
  • Example 3 The configuration of the observation optical system of Example 3 is shown in FIG.
  • the observation optical system of the third embodiment includes a display element 1, an optical member 2, an eyepiece lens 3, and an optical member 4 in this order from the display element side to the eye point side.
  • the eyepiece 3 is composed of four lenses, the first lens L1 to the fourth lens L4, in order from the display element side to the eye point side.
  • the first lens L1 is a meniscus-shaped positive lens with a concave surface facing the display element side in the paraxial region
  • the second lens L2 is a negative lens having both concave shapes in the paraxial region
  • the third lens L3 is a paraxial region. It is a biconvex positive lens in the region
  • the fourth lens L4 is a meniscus-shaped positive lens with a concave surface facing the display element side in the paraxial region. All of the first lens L1 to the fourth lens L4 are single lenses. Both sides of the first lens L1 to the fourth lens L4 are aspherical. At the time of diopter adjustment, the three lenses of the first lens L1 to the third lens L3 move integrally, and the fourth lens L4 is immovable.
  • the basic lens data is shown in Table 9
  • the specifications are shown in Table 10
  • the variable surface spacing is shown in Table 11
  • the aspherical coefficient is shown in Table 12
  • the aberration diagrams are shown in FIGS. 9 and 10. show.
  • Example 4 The configuration of the observation optical system of Example 4 is shown in FIG.
  • the observation optical system of the fourth embodiment includes a display element 1, an optical member 2, an eyepiece 3, and an optical member 4 in this order from the display element side to the eye point side.
  • the eyepiece 3 is composed of three lenses, a first lens L1 to a third lens L3, in order from the display element side to the eye point side.
  • the first lens L1 is a biconvex positive lens in the paraxial region
  • the second lens L2 is a biconcave negative lens in the paraxial region
  • the third lens L3 is a biconvex positive in the paraxial region. It is a lens. All of the first lens L1 to the third lens L3 are single lenses. All sides of the first lens L1 to the third lens L3 are aspherical surfaces. At the time of diopter adjustment, the three lenses of the first lens L1 to the third lens L3 move integrally.
  • the basic lens data is shown in Table 13
  • the specifications are shown in Table 14
  • the variable surface spacing is shown in Table 15
  • the aspherical coefficient is shown in Table 16
  • the aberration diagrams are shown in FIGS. 12 and 13. show.
  • Example 5 The configuration of the observation optical system of Example 5 is shown in FIG.
  • the observation optical system of the fifth embodiment includes a display element 1, an optical member 2, an eyepiece 3, and an optical member 4 in this order from the display element side to the eye point side.
  • the eyepiece 3 is composed of five lenses, the first lens L1 to the fifth lens L5, in order from the display element side to the eye point side.
  • the first lens L1 is a meniscus-shaped positive lens with a concave surface facing the display element side in the near-axis region
  • the second lens L2 is a negative lens having both concave shapes in the near-axis region
  • the third lens L3 is a near-axis.
  • the fourth lens L4 is a positive lens with a biconvex shape in the region
  • the fourth lens L4 is a meniscus-shaped positive lens with the concave surface facing the display element side in the near-axis region
  • the fifth lens L5 is a concave surface toward the display element side in the near-axis region.
  • first lens L1 to the fifth lens L5 are aspherical surfaces. At the time of diopter adjustment, the four lenses of the first lens L1 to the fourth lens L4 move integrally, and the fifth lens L5 is immovable.
  • the basic lens data is shown in Table 17, the specifications are shown in Table 18, the variable surface spacing is shown in Table 19, the aspherical coefficient is shown in Table 20, and the aberration diagrams are shown in FIGS. 15 and 16. show.
  • Example 6 The configuration of the observation optical system of Example 6 is shown in FIG.
  • the observation optical system of the sixth embodiment includes a display element 1, an optical member 2, an eyepiece 3, and an optical member 4 in this order from the display element side to the eye point side.
  • the eyepiece 3 is composed of four lenses, the first lens L1 to the fourth lens L4, in order from the display element side to the eye point side.
  • the first lens L1 is a biconvex positive lens in the paraxial region
  • the second lens L2 is a biconcave negative lens in the paraxial region
  • the third lens L3 is concave on the display element side in the paraxial region.
  • the fourth lens L4 is a positive lens having a biconvex shape in the paraxial region. All of the first lens L1 to the fourth lens L4 are single lenses. Both sides of the first lens L1 to the fourth lens L4 are aspherical. At the time of diopter adjustment, the four lenses of the first lens L1 to the fourth lens L4 move integrally.
  • the basic lens data is shown in Table 21, the specifications are shown in Table 22, the variable surface spacing is shown in Table 23, the aspherical coefficient is shown in Table 24, and the aberration diagrams are shown in FIGS. 18 and 19. show.
  • Example 7 The configuration of the observation optical system of Example 7 is shown in FIG.
  • the observation optical system of the seventh embodiment includes a display element 1, an optical member 2, an eyepiece 3, and an optical member 4 in this order from the display element side to the eye point side.
  • the eyepiece 3 is composed of four lenses, the first lens L1 to the fourth lens L4, in order from the display element side to the eye point side.
  • the first lens L1 is a meniscus-shaped positive lens with a concave surface facing the display element side in the paraxial region
  • the second lens L2 is a negative lens having both concave shapes in the paraxial region
  • the third lens L3 is a paraxial region. It is a biconvex positive lens in the region
  • the fourth lens L4 is a meniscus-shaped positive lens with a concave surface facing the display element side in the paraxial region. All of the first lens L1 to the fourth lens L4 are single lenses. Both sides of the first lens L1 to the fourth lens L4 are aspherical. At the time of diopter adjustment, the four lenses of the first lens L1 to the fourth lens L4 move integrally.
  • the basic lens data is shown in Table 25
  • the specifications are shown in Table 26
  • the variable surface spacing is shown in Table 27
  • the aspherical coefficient is shown in Table 28, and the aberration diagrams are shown in FIGS. 21 and 22. show.
  • Tables 29 and 30 show the corresponding values of the conditional expressions (1) to (25) of the observation optical system of Examples 1 to 7.
  • Table 31 shows the focal lengths of the lenses of Examples 1 to 7.
  • F3, f4, and f5 in Table 31 are the focal length of the third lens L3, the focal length of the fourth lens L4, and the focal length of the fifth lens L5, respectively.
  • the values shown in Tables 29 to 31 are values based on the d-line.
  • the observation optical systems of Examples 1 to 7 have a viewing angle of 20 degrees or more at a half angle of view, more specifically, 21 degrees or more, and have a wide viewing angle. There is. Further, in the observation optical systems of Examples 1 to 7, various aberrations are satisfactorily corrected to realize high optical performance.
  • FIG. 23 is a perspective view showing a schematic configuration on the back side of the camera 100, which is an optical device according to an embodiment of the present disclosure.
  • the camera 100 is, for example, a digital camera.
  • the camera 100 includes a finder 101 according to an embodiment of the present disclosure on the upper part of the camera body 102.
  • the finder 101 is an example of an observation optical device, and includes an observation optical system according to an embodiment of the present disclosure.
  • the camera 100 includes an operation button 103 for performing various settings, a zoom lever 104 for performing scaling, and a monitor 106 for displaying images and various setting screens on the back surface of the camera body 102, and the camera body 102.
  • a shutter button 105 is provided on the upper surface of the above.
  • the camera 100 includes an image pickup lens (not shown) on the front surface of the camera body 102, and an image pickup element (not shown) for capturing a subject image formed by the image pickup lens inside the camera body 102. The user looks into the finder 101 from the back side and observes the subject image.
  • the techniques of the present disclosure have been described above with reference to embodiments and examples, the techniques of the present disclosure are not limited to the above embodiments and examples, and various modifications are possible.
  • the radius of curvature, the interplanar spacing, the refractive index, the Abbe number, the aspherical coefficient, and the like of each lens are not limited to the values shown in the above numerical examples, and may take other values.
  • the optical device according to the embodiment of the present disclosure is not limited to the above example, and the present disclosure can be applied to a film camera, a video camera, a head-mounted display, and the like.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
PCT/JP2021/027945 2020-08-27 2021-07-28 観察光学系および光学装置 Ceased WO2022044675A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN202180051935.0A CN116113863A (zh) 2020-08-27 2021-07-28 观察光学系统及光学装置
JP2022545571A JP7518177B2 (ja) 2020-08-27 2021-07-28 観察光学系および光学装置
US18/169,717 US20230194852A1 (en) 2020-08-27 2023-02-15 Observation optical system and optical apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020143525 2020-08-27
JP2020-143525 2020-08-27

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US18/169,717 Continuation US20230194852A1 (en) 2020-08-27 2023-02-15 Observation optical system and optical apparatus

Publications (1)

Publication Number Publication Date
WO2022044675A1 true WO2022044675A1 (ja) 2022-03-03

Family

ID=80353034

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/027945 Ceased WO2022044675A1 (ja) 2020-08-27 2021-07-28 観察光学系および光学装置

Country Status (4)

Country Link
US (1) US20230194852A1 (https=)
JP (1) JP7518177B2 (https=)
CN (1) CN116113863A (https=)
WO (1) WO2022044675A1 (https=)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023005104A (ja) * 2021-06-28 2023-01-18 キヤノン株式会社 観察装置、及びそれを有する撮像装置
US12210143B2 (en) 2022-09-30 2025-01-28 Largan Precision Co., Ltd. Image system lens assembly, image capturing unit and electronic device
US12306465B2 (en) 2021-08-25 2025-05-20 Largan Precision Co., Ltd. Optical lens assembly and head-mounted device
US12591120B2 (en) 2020-09-09 2026-03-31 Largan Precision Co., Ltd. Image capturing lens system, image capturing unit and electronic device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0954259A (ja) * 1995-08-10 1997-02-25 Nikon Corp 接眼レンズ
JP2016038521A (ja) * 2014-08-08 2016-03-22 キヤノン株式会社 ファインダー光学系及びそれを有する観察装置、撮像装置
JP2016051061A (ja) * 2014-08-29 2016-04-11 キヤノン株式会社 接眼レンズ及びそれを有する観察装置、撮像装置
WO2019054358A1 (ja) * 2017-09-15 2019-03-21 株式会社ニコン 接眼光学系、光学機器及び接眼光学系の製造方法

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3335199B2 (ja) * 1992-12-01 2002-10-15 旭光学工業株式会社 接眼レンズ
JPH06194583A (ja) * 1992-12-24 1994-07-15 Canon Inc 接眼レンズ及びそれを用いた付加光学系
JPH08254660A (ja) * 1995-01-17 1996-10-01 Asahi Optical Co Ltd 接眼レンズ
JP2000199866A (ja) * 1998-12-28 2000-07-18 Canon Inc 接眼レンズ及びそれを用いた観察光学系
JP6429538B2 (ja) * 2014-08-29 2018-11-28 キヤノン株式会社 接眼レンズ及びそれを有する観察装置、撮像装置
JP6701508B2 (ja) 2015-12-03 2020-05-27 株式会社ニコン 接眼レンズ及び光学機器
JP6548590B2 (ja) * 2016-02-18 2019-07-24 富士フイルム株式会社 撮像レンズおよび撮像装置
US11231531B2 (en) * 2018-02-20 2022-01-25 Fujifilm Corporation Finder optical system and imaging device
JP2020027113A (ja) * 2018-08-09 2020-02-20 キヤノン株式会社 観察光学系及びそれを有する観察装置
JP7179598B2 (ja) * 2018-12-04 2022-11-29 キヤノン株式会社 観察装置及びそれを有する撮像装置
JP2021117457A (ja) 2020-01-29 2021-08-10 キヤノン株式会社 接眼光学系およびそれを有する撮像装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0954259A (ja) * 1995-08-10 1997-02-25 Nikon Corp 接眼レンズ
JP2016038521A (ja) * 2014-08-08 2016-03-22 キヤノン株式会社 ファインダー光学系及びそれを有する観察装置、撮像装置
JP2016051061A (ja) * 2014-08-29 2016-04-11 キヤノン株式会社 接眼レンズ及びそれを有する観察装置、撮像装置
WO2019054358A1 (ja) * 2017-09-15 2019-03-21 株式会社ニコン 接眼光学系、光学機器及び接眼光学系の製造方法

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12591120B2 (en) 2020-09-09 2026-03-31 Largan Precision Co., Ltd. Image capturing lens system, image capturing unit and electronic device
JP2023005104A (ja) * 2021-06-28 2023-01-18 キヤノン株式会社 観察装置、及びそれを有する撮像装置
JP7730677B2 (ja) 2021-06-28 2025-08-28 キヤノン株式会社 観察装置、及びそれを有する撮像装置
US12306465B2 (en) 2021-08-25 2025-05-20 Largan Precision Co., Ltd. Optical lens assembly and head-mounted device
US12210143B2 (en) 2022-09-30 2025-01-28 Largan Precision Co., Ltd. Image system lens assembly, image capturing unit and electronic device

Also Published As

Publication number Publication date
JPWO2022044675A1 (https=) 2022-03-03
CN116113863A (zh) 2023-05-12
US20230194852A1 (en) 2023-06-22
JP7518177B2 (ja) 2024-07-17

Similar Documents

Publication Publication Date Title
JP6098838B2 (ja) 接眼光学系および撮像装置
JP6615068B2 (ja) 接眼レンズおよび撮像装置
JP6128607B2 (ja) ズームレンズおよび撮像装置
JP6129766B2 (ja) ズームレンズおよび撮像装置
JP2016001209A (ja) 接眼レンズおよび撮像装置
JP6533949B2 (ja) ズームレンズ系、撮像装置及びカメラ
JP7518177B2 (ja) 観察光学系および光学装置
JP6388851B2 (ja) 撮像レンズおよび撮像装置
JP5745186B2 (ja) 接眼レンズおよび撮像装置
JP2016012118A (ja) ズームレンズおよび撮像装置
JP7399113B2 (ja) 撮像レンズおよび撮像装置
JP2016164629A (ja) ズームレンズおよび撮像装置
JP2019060971A (ja) 結像レンズおよび光学装置
JP6453713B2 (ja) 撮像レンズおよび撮像装置
JP2017058589A (ja) ズームレンズおよび撮像装置
JP2016004192A (ja) ズームレンズおよび撮像装置
JP7191005B2 (ja) 接眼レンズ、観察光学系、および光学装置
JP6934901B2 (ja) ファインダー光学系及び撮像装置
JP2023046217A (ja) 観察光学系および光学装置
JP2018060003A (ja) 撮像レンズおよび撮像装置
JP2020181222A (ja) 接眼レンズおよび撮像装置
US12379584B2 (en) Observation optical system and optical apparatus
JP2018146869A (ja) ズームレンズおよび撮像装置
JP6750081B2 (ja) 接眼レンズおよび撮像装置
JP7146706B2 (ja) 接眼レンズおよび光学装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21861103

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2022545571

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 21861103

Country of ref document: EP

Kind code of ref document: A1