WO2019054359A1 - Système optique à oculaire, dispositif optique et procédé de production de système optique à oculaire - Google Patents

Système optique à oculaire, dispositif optique et procédé de production de système optique à oculaire Download PDF

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Publication number
WO2019054359A1
WO2019054359A1 PCT/JP2018/033570 JP2018033570W WO2019054359A1 WO 2019054359 A1 WO2019054359 A1 WO 2019054359A1 JP 2018033570 W JP2018033570 W JP 2018033570W WO 2019054359 A1 WO2019054359 A1 WO 2019054359A1
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Prior art keywords
lens
optical system
lens component
eyepiece optical
refractive power
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PCT/JP2018/033570
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English (en)
Japanese (ja)
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歩 槇田
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株式会社ニコン
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Priority to JP2019542058A priority Critical patent/JP7037730B2/ja
Publication of WO2019054359A1 publication Critical patent/WO2019054359A1/fr
Priority to JP2022032904A priority patent/JP7280561B2/ja

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B25/00—Eyepieces; Magnifying glasses

Definitions

  • the present invention relates to an eyepiece optical system, an optical device, and a method of manufacturing the eyepiece optical system.
  • Patent Document 1 Conventionally, an eyepiece optical system having high imaging performance has been proposed (see, for example, Patent Document 1). However, Patent Document 1 has a problem that further improvement in optical performance is required.
  • the eyepiece optical system according to the first aspect of the present invention has a first lens component having a positive refractive power, a second lens component having a negative refractive power, and a positive refractive power in order from the observation object side.
  • a third lens component and a fourth lens component having a positive refractive power are satisfied, and the condition of the following expression is satisfied. 1.38 ⁇ fe / f1 ⁇ 3.00
  • fe focal length of the whole system of the eyepiece optical system
  • f1 focal length of the first lens component "lens component" means a single lens or a cemented lens.
  • a first lens component having a positive refractive power, a second lens component having a negative refractive power, and a positive refractive power are sequentially arranged from an observation object side.
  • a fourth lens component having a positive refractive power and the condition of the following equation is satisfied. 0.48 ⁇ fe / f12 ⁇ 3.00
  • fe focal length of the whole system of the eyepiece optical system
  • f12 combined focal length of the first lens component and the second lens component "lens component" means a single lens or a cemented lens.
  • the first lens component having positive refractive power, the second lens component having negative refractive power, and the positive lens component in order from the observation object side It is a manufacturing method of the eyepiece optical system which has the 3rd lens component which has the following, and the 4th lens component which has positive refractive power, and it arranges so that the conditions of a following formula may be satisfied. 1.38 ⁇ fe / f1 ⁇ 3.00
  • fe focal length of the whole system of the eyepiece optical system
  • f1 focal length of the first lens component "lens component" means a single lens or a cemented lens.
  • a first lens component having positive refractive power, a second lens component having negative refractive power, and a positive lens component in order from the observation object side It is a manufacturing method of the eyepiece optical system which has the 3rd lens component which has the following, and the 4th lens component which has positive refractive power, and it arranges so that the conditions of a following formula may be satisfied. 0.48 ⁇ fe / f12 ⁇ 3.00
  • fe focal length of the whole system of the eyepiece optical system
  • f12 combined focal length of the first lens component and the second lens component "lens component" means a single lens or a cemented lens.
  • FIG. 5 shows various aberrations of the eyepiece optical system according to the first example. It is sectional drawing which shows the lens structure of the eyepiece optical system which concerns on 2nd Example.
  • FIG. 7 shows various aberrations that occurred in the eyepiece optical system according to the second example. It is sectional drawing which shows the lens structure of the eyepiece optical system which concerns on 3rd Example.
  • FIG. 7 shows various aberrations that occurred in the eyepiece optical system according to the third example. It is sectional drawing which shows the lens structure of the eyepiece optical system which concerns on 4th Example.
  • FIG. 7 shows various aberrations that occurred in the eyepiece optical system according to the fourth example.
  • FIG. 21 shows various aberrations that occur in the eyepiece optical system according to the fifth example. It is sectional drawing which shows the lens structure of the eyepiece optical system which concerns on 6th Example. FIG. 21 shows various aberrations that occur in the eyepiece optical system according to the sixth example. It is sectional drawing which shows the lens structure of the eyepiece optical system which concerns on 7th Example. FIG. 21 shows various aberrations that occur in the eyepiece optical system according to the seventh example. It is sectional drawing which shows the lens structure of the eyepiece optical system which concerns on 8th Example. FIG. 21 shows various aberrations that occur in the eyepiece optical system according to the eighth example.
  • FIG. 21 shows various aberrations that occur in the eyepiece optical system according to the ninth example. It is sectional drawing which shows the lens structure of the eyepiece optical system which concerns on 10th Example. FIG. 21 shows various aberrations that occur in the eyepiece optical system according to the tenth example. It is sectional drawing which shows the lens structure of the eyepiece optical system which concerns on 11th Example. FIG. 21 shows various aberrations that occur in the eyepiece optical system according to the eleventh example. It is a sectional view of a camera which carries the above-mentioned eyepiece optical system. It is a flowchart for demonstrating the manufacturing method of the said eyepiece optical system.
  • the eyepiece optical system EL includes, in order from an observation object side (also simply referred to as “object”), a first lens component G1 having positive refractive power and negative refractive power. And a third lens component G3 having a positive refractive power, and a fourth lens component G4 having a positive refractive power.
  • lens component refers to a single lens or a cemented lens.
  • lens element refers to each lens constituting a single lens or a cemented lens.
  • the “reference diopter” refers to a diopter of ⁇ 1 [1 / m].
  • diopter X [1 / m] is a state in which the image by the eyepiece optical system EL can be positioned at 1 / X [m (meters)] on the optical axis from the eye point (The sign is positive when the image is formed closer to the observer (eye point side) than the eyepiece optical system EL).
  • Conditional expression (1) defines the refractive power of the first lens component G1 closest to the object to be observed, in order to intensify the total refractive power of the eyepiece optical system EL while maintaining good spherical aberration and coma aberration. It is.
  • the first lens component G1 closest to the observation object side has the least influence on spherical aberration and coma.
  • the first lens component G1 greatly affects the deterioration of the field curvature, the field curvature generated by the positive refractive power of the first lens component G1 may be corrected by the negative refractive power of the second lens component G2. It is possible.
  • the first lens component G1 closest to the observation object a strong positive refractive power.
  • the positive refractive power of the first lens component G1 closest to the observation object becomes weak
  • the refractive power of the entire eyepiece optical system EL becomes weak
  • the observation magnification is increased. Is not preferable because it becomes difficult.
  • the upper limit value of the conditional expression (1) If the upper limit value of the conditional expression (1) is exceeded, the positive refractive power of the first lens component G1 closest to the observation object becomes strong, and the curvature of field generated in the first lens component G1 becomes large. The curvature of field can not be completely corrected by the lens component G2, which is not preferable.
  • fe Focal length of the whole system of the eyepiece optical system
  • EL f12 Synthetic focal length of the first lens component G1 and the second lens component G2
  • Conditional expression (2) defines the combined refractive power of the first lens component G1 and the second lens component G2 in order to increase the observation magnification and correct the field curvature well.
  • the refractive power of the first lens component G1 and the refractive power of the second lens component G2 greatly affect correction and generation of curvature of field. In order not to generate field curvature, it is desirable to weaken the combined refractive power of the first lens component G1 and the second lens component G2. However, if the combined refractive power of the first lens component G1 and the second lens component G2 is weakened, the refractive power of the entire eyepiece optical system EL is weakened, and it becomes difficult to increase the observation magnification.
  • the combined refractive power of the first lens component G1 and the second lens component G2 is weak, and if the observation magnification is increased excessively, the refractive powers of the third lens component G3 and the fourth lens component G4 become strong, and spherical aberration , Worsen coma. If the lower limit value of the conditional expression (2) is not reached, the synthetic refractive power of the first lens component G1 and the second lens component G2 becomes weak, and the observation magnification can not be increased. In addition, if the observation magnification is increased while the value is below the lower limit value of the conditional expression (2), the spherical aberration and the coma aberration are unfavorably deteriorated.
  • conditional expression (2) it is more desirable to set the lower limit value of the conditional expression (2) to 0.48, further 0.50, and further 0.55. If the upper limit value of the conditional expression (2) is exceeded, the combined refractive power of the first lens component G1 and the second lens component G2 becomes strong, and curvature of field occurs, which is not preferable. In order to secure the effect of the conditional expression (2), it is more desirable to set the upper limit value of the conditional expression (2) to 1.00 and further to 0.70.
  • the eyepiece optical system EL when the lens surface on the eye point side of the lens closest to the eye point is made convex to the eye point side, the light ray near the center of the observation object is the most eye The emission angle from the lens surface on the eye point side of the lens on the point side becomes small, and the amount of generation of spherical aberration can be suppressed. On the other hand, the exit angle of the light beam in the peripheral portion of the screen can be increased, and the coma aberration can be corrected.
  • the eyepiece optical system EL it is desirable that at least one of the lens elements constituting the second lens component G2 satisfy the conditional expression (3) shown below.
  • d d 2 Abbe number for the d-line of the medium of the lens element constituting the second lens component G 2
  • Conditional expression (3) defines the Abbe number of the lens element having the strongest negative refractive power among the lens elements constituting the second lens component G2 in order to correct the lateral chromatic aberration well.
  • the negative refractive power of the second lens component G2 is The power is smaller. Therefore, by increasing the dispersion of the lens element having the most negative refractive power among the second lens component G2, the lateral chromatic aberration can be corrected well even with the negative refractive power of the weak second lens component G2.
  • conditional expression (3) If the lower limit value of the conditional expression (3) is not reached, overcorrection of magnification chromatic aberration occurs and the magnification chromatic aberration is deteriorated. In order to secure the effect of the conditional expression (3), it is more desirable to set the lower limit value of the conditional expression (3) to 20 and further to 30. If the upper limit value of the conditional expression (3) is exceeded, it is not preferable because lateral chromatic aberration can not be corrected. In order to secure the effect of the conditional expression (3), it is desirable to set the upper limit value of the conditional expression (3) to 22.
  • fe Focal length of the whole system of the eyepiece optical system
  • EL f4 Focal length of the fourth lens component G4
  • Conditional expression (4) defines the refractive power of the lens closest to the eye point in order to correct spherical aberration and coma aberration well.
  • the fourth lens component G4 closest to the eye point has the largest influence on spherical aberration and coma. Therefore, if the upper limit value of the conditional expression (4) is exceeded, the positive refractive power of the fourth lens component G4 becomes strong, and the spherical aberration and the coma aberration are largely deteriorated.
  • the lower limit value of the conditional expression (4) If the lower limit value of the conditional expression (4) is not reached, it is difficult to intensify the refractive power (power) of the entire eyepiece optical system EL, and it is not preferable because the observation magnification can not be increased. Assuming that the refractive power of the fourth lens component G4 falls below the lower limit value of the conditional expression (4) and the observation magnification is increased, the positive refractive powers of the first lens component G1 and the third lens component G3 become extreme. Correction of curvature of field becomes difficult as the second lens component G2 becomes stronger or the negative refractive power of the second lens component G2 becomes weaker. In order to secure the effect of the conditional expression (4), it is more desirable to set the lower limit value of the conditional expression (4) to 0.10, further preferably 0.15.
  • G2R2 curvature radius of lens surface of second lens component G2 closest to eye point
  • G3R1 curvature radius of lens surface of third lens component G3 closest to observation object
  • Conditional expression (5) defines the shape of the lens surface on the most eye point side of the second lens component G2 and the shape of the lens surface on the most observation object side of the third lens component G3 in order to correct coma aberration well. It is a thing.
  • the lens surface closest to the eye point of the second lens component G2 and the lens surface closest to the observation object of the third lens component G3 greatly affect the generation or correction of coma. In order to correct coma aberration favorably, it is preferable to correct coma aberration generated on the lens surface closest to the eye point of the second lens component G2 with the lens surface closest to the observation object of the third lens component G3.
  • the shape of the lens surface on the most eye point side of the second lens component G2 and the shape of the lens surface on the most observation object side of the third lens component G3 are made similar. It is desirable to make coma aberration generated on the lens surface closest to the eye point of the two lens component G2 similar to coma aberration corrected on the lens surface closest to the observation object on the third lens component G3 to cancel coma aberration. Below the lower limit value of the conditional expression (5), the similarity between the shape of the lens surface on the most eye point side of the second lens component G2 and the shape of the lens surface on the most observation object side of the third lens component G3 collapses. It is not preferable because coma aberration occurs.
  • conditional expression (5) In order to secure the effect of the conditional expression (5), it is desirable to set the lower limit value of the conditional expression (5) to ⁇ 0.25. Further, when the upper limit value of the conditional expression (5) is exceeded, the similarity between the shape of the lens surface on the most eye point side of the second lens component G2 and the shape of the lens surface on the most observation object side of the third lens component G3 It is not preferable because it collapses and coma aberration occurs. In order to secure the effect of the conditional expression (5), it is more desirable to set the upper limit value of the conditional expression (5) to 0.25, further to ⁇ 0.20.
  • G1R1 The radius of curvature of the lens surface of the first lens component G1 closest to the observation object
  • G1R2 The radius of curvature of the lens surface closest to the eye point of the first lens component
  • Conditional expression (6) defines the shape of the first lens component G1 in order to increase the observation magnification and correct the curvature of field and distortion well.
  • the positive refractive power of the first lens component G1 generates a curvature of field, but the curvature of field generated by the negative refractive power of the second lens component G2 is corrected. If the refractive power of the lens surface closest to the eye point of the first lens component G1 is increased, the field curvature generated by the first lens component G1 becomes large, and the negative refractive power of the second lens component G2 is sufficient to correct It disappears.
  • the positive refractive power of the lens surface closest to the observation object of the first lens component G1 should be You have to make it bigger. However, if the positive refracting power of the lens surface closest to the observation object of the first lens component G1 is increased too much, distortion will be aggravated. If the upper limit value of the conditional expression (6) is exceeded, the refractive power of the first lens component G1 becomes too large, and the distortion is aggravated, which is not preferable. In order to secure the effect of the conditional expression (6), it is more desirable to set the upper limit value of the conditional expression (6) to ⁇ 0.20, further preferably ⁇ 0.30.
  • the refractive power of the first lens component G1 becomes weak, and the observation magnification can not be increased.
  • the observation magnification is increased while the lower limit value of conditional expression (6) is exceeded, the refractive power of the lens surface closest to the eye point of the first lens component G1 increases, and the field curvature is degraded. Not desirable.
  • the eyepiece optical system EL can correct distortion by setting the lens surface closest to the observation object of the first lens component G1 to be rotationally symmetric aspheric, so that the first lens component G1 can be corrected. This makes it possible to strengthen the refractive power of the lens surface closest to the observation object, which is advantageous for increasing the observation magnification.
  • fe Focal length of the whole system of the eyepiece optical system EL: Entrance pupil position of the eyepiece optical system EL at a reference diopter (the code is positive on the eye point side with respect to the surface of the observation object)
  • Conditional expression (7) defines the entrance pupil position in order to increase the observation magnification while keeping the eye point long.
  • By increasing the passing height of the chief ray of high image height in a region close to the observation object plane it becomes easy to increase the observation magnification while keeping the eye point long.
  • In order to increase the passing height of the chief ray having a high image height in a region close to the observation object plane it is effective to set the entrance pupil distance to a near distance opposite to the eye point side from the observation object plane. If the upper limit value of the conditional expression (7) is exceeded, the entrance pupil position is separated from the observation object, and it is not possible to increase the passing height of the chief ray of high image height. It is not preferable because it becomes impossible.
  • conditional expression (7) In order to secure the effect of the conditional expression (7), it is desirable to set the upper limit value of the conditional expression (7) to ⁇ 0.50. If the lower limit value of conditional expression (7) is not reached, the entrance pupil position approaches the observation object too much, so the chief ray ray passing height of the first lens component G1 at the high image height becomes high, and a large field curvature occurs. It is not preferable because it In order to secure the effect of the conditional expression (7), it is more desirable to set the lower limit value of the conditional expression (7) to ⁇ 0.70, further preferably ⁇ 0.65.
  • fe Focal length of the whole system of the eyepiece optical system
  • EL f23 Synthetic focal length of the second lens component G2 and the third lens component G3
  • the conditional expression (8) reduces the deterioration of the aberration performance when the optical axes of the second lens component G2 and the third lens component G3 are shifted, so the second lens component G2 and the third lens component G3 It defines the ratio of the combined focal length of the above and the focal length of the entire eyepiece optical system EL.
  • the second lens component G2 and the third lens component G3 are made of an optical resin. If the lower limit value of the conditional expression (8) is not reached, the negative combined refractive power of the second lens component G2 and the third lens component G3 becomes strong, and the deterioration of aberration performance due to manufacturing errors becomes large, which is not preferable. In order to secure the effect of the conditional expression (8), it is desirable to set the lower limit value of the conditional expression (8) to ⁇ 0.35.
  • the upper limit value of the conditional expression (8) If the upper limit value of the conditional expression (8) is exceeded, the negative refractive power of the second lens component G2 decreases, which is not preferable because the correction of curvature of field becomes insufficient. In order to secure the effect of the conditional expression (8), it is more desirable to set the upper limit value of the conditional expression (8) to ⁇ 0.20, further preferably ⁇ 0.25.
  • the conditional expression (9) corrects coma aberration well, so the air conversion distance from the observation object at the reference diopter to the lens surface closest to the observation object of the first lens component G1 and the focal distance of the first lens component G1 Defines the ratio of When the air conversion distance from the observation object to the lens surface closest to the observation object of the first lens component G1 at the reference diopter becomes large, the luminous flux emitted from one point on the observation surface passes high on the first lens component G1. Changes greatly.
  • the air conversion distance D1 from the observation object to the lens surface closest to the observation object of the first lens component G1 becomes large, the positive refractive power of the first lens component G1 causes a large coma aberration, so the first lens component It is necessary to reduce the refractive power of G1.
  • the first lens component G1 in order to increase the refractive power of the first lens component G1, in order to reduce the coma aberration generated in the first lens component G1, from the observation object to the lens surface closest to the observation object on the first lens component G1.
  • the refractive power of the first lens component G1 becomes stronger than the air conversion distance D1 from the observation object to the lens surface closest to the observation object of the first lens component G1. It is not preferable because the aberration is aggravated.
  • the total length of the eyepiece optical system EL is the distance on the optical axis from the observation object O to the lens surface closest to the eye point of the eyepiece optical system EL.
  • Conditional expression (10) defines the ratio of the total length of the eyepiece optical system EL to the focal length of the entire system in order to correct the field curvature. If the lower limit value of the conditional expression (10) is not reached, it is not preferable because the refractive power of the entire eyepiece optical system EL becomes weak and the observation magnification can not be increased. In order to secure the effect of the conditional expression (10), it is more desirable to set the lower limit value of the conditional expression (10) to 1.55, further preferably 1.60. If the upper limit value of the conditional expression (10) is exceeded, the curvature of field is deteriorated. In order to secure the effect of the conditional expression (10), it is desirable to set the upper limit value of the conditional expression (10) to 1.70.
  • the eyepiece optical system EL which concerns on this embodiment, it is desirable to satisfy the conditional expression (11) shown below.
  • the first lens component G1 is configured of a cemented lens and has a plurality of lens elements, at least one of the lens elements satisfies the conditional expression (11).
  • nd1 the refractive index to the d-line of the medium of the lens element constituting the first lens component G1
  • the conditional expression (11) defines the refractive index to the d-line of the medium of the lens element constituting the first lens component G1 in order to correct distortion and field curvature well. If the lower limit value of the conditional expression (11) is not reached, it is not preferable because the first lens component G1 can not have refracting power and it is difficult to maintain performance and achieve high magnification. In order to secure the effect of the conditional expression (11), it is more desirable to set the lower limit value of the conditional expression (11) to 1.600, further preferably 1.700. If the upper limit value of the conditional expression (11) is exceeded, distortion will deteriorate, which is not preferable. In order to secure the effect of the conditional expression (11), it is desirable to set the upper limit value of the conditional expression (11) to 1.850.
  • the eyepiece optical system EL which concerns on this embodiment, it is desirable to satisfy the conditional expression (12) shown below.
  • the second lens component G2 is formed of a cemented lens and has a plurality of lens elements, at least one of those lens elements satisfies the conditional expression (12).
  • nd2 the refractive index to the d-line of the medium of the lens element constituting the second lens component G2
  • the conditional expression (12) defines the refractive index to the d-line of the medium of the lens element constituting the second lens component G2 in order to correct the astigmatism well. If the lower limit value of the conditional expression (12) is not reached, the optical performance is deteriorated due to the decentering of the second lens component G2, which is not preferable. In order to secure the effect of the conditional expression (12), it is desirable to set the lower limit value of the conditional expression (12) to 1.650. If the upper limit value of the conditional expression (12) is exceeded, correction of astigmatism becomes difficult, which is not preferable. In order to secure the effect of the conditional expression (12), it is desirable to set the upper limit value of the conditional expression (12) to 1.750.
  • the first lens component G1, the second lens component G2, the third lens component G3, and the fourth lens component G4 are configured as single lenses, and are configured by four single lenses. However, sufficiently good aberration performance can be achieved.
  • the eyepiece optical system EL according to this embodiment can easily adjust the diopter by moving the entire eyepiece optical system in the optical axis direction.
  • the camera 1 is a so-called mirrorless camera of an interchangeable lens type provided with an objective lens (shooting lens) OL.
  • an object (object) (not shown) is collected by the objective lens OL, and is taken on the imaging surface of the imaging unit C via an OLPF (Optical Low Pass Filter) (not shown).
  • OLPF Optical Low Pass Filter
  • the electronic view finder EVF includes an image display element DP such as a liquid crystal display element and an eyepiece optical system EL for magnifying and observing an image displayed on a display surface (the observation object O described above) of the image display element DP. And is configured.
  • the photographer can observe the image of the object (subject) formed by the objective lens OL through the eyepiece optical system EL by positioning the eye at the eye point EP.
  • the image photoelectrically converted by the imaging unit C is stored in a memory (not shown). In this way, the photographer can shoot a subject with the main camera 1.
  • the eyepiece optical system EL according to the present embodiment is a single-lens reflex camera having a quick return mirror in the camera body and observing a subject with a finder optical system. Even when mounted, the same effect as the camera 1 can be obtained.
  • the eyepiece optical system EL according to the present embodiment is an optical system (eyepiece lens) for magnifying and observing an image.
  • the image is an intermediate image by an objective lens, or a display surface of an image display element such as a liquid crystal display element or an organic EL display, and particularly preferably a display surface of an organic EL display. Therefore, the eyepiece optical system EL according to the present embodiment is used, for example, as an electronic binocular for observing an image displayed on a display surface, a head mounted display, or an eyepiece lens of an internal or external electronic viewfinder of a camera. Suitable for
  • an optical member such as a cover glass or a prism is provided between the observation object O (display surface of the image display element DP shown in FIG. 23) and the first lens component G1. It may be arranged. Also, an optical member such as a cover glass may be disposed between the fourth lens component G4 and the eyepoint EP.
  • each lens is disposed, and a first lens component G1 having positive refractive power, a second lens component G2 having negative refractive power, a third lens component G3 having positive refractive power, and positive refractive power
  • a fourth lens component having a force and G4 are prepared respectively (step S100). And it arranges so that the conditions by a predetermined conditional expression (for example, conditional expression (1) mentioned above and conditional expression (2)) may be satisfied (Step S200).
  • a predetermined conditional expression for example, conditional expression (1) mentioned above and conditional expression (2)
  • a biconvex positive lens shape in which the lens surface on the observation object side and the lens surface on the eye point side are formed in an aspheric shape in order from the observation object side.
  • Negative meniscus lens L11 is disposed as a first lens component G1, and a lens surface on the observation object side and a lens surface on the eye point side are formed in an aspheric shape, and a negative meniscus lens shape concave on the observation object side Is arranged as a second lens component G2, and the lens surface on the observation object side and the lens surface on the eye point side are formed in an aspheric shape, and a positive meniscus lens shape having a concave surface facing the object side
  • FIG.1, FIG.3, FIG.5, FIG.7, FIG.9, FIG.11, FIG.13, FIG.15, FIG.17, FIG.19 and FIG. 21 is eyepiece optical system EL (EL1-EL11) which concerns on each Example. And the distribution of refractive power.
  • the aspheric surface has a height in the direction perpendicular to the optical axis as y, and the distance along the optical axis from the tangent plane of the apex of each aspheric surface at height y to each aspheric surface (sag amount
  • S S
  • r the radius of curvature of the reference spherical surface (paraxial radius of curvature)
  • K the conic constant
  • K the nth-order aspheric coefficient
  • Ru the following equation (a) is Ru.
  • “E-n” indicates “ ⁇ 10 ⁇ n ”.
  • the second-order aspheric coefficient A2 is zero. Further, in the tables of the respective embodiments, the aspheric surface is marked with * on the right side of the surface number.
  • FIG. 1 is a view showing the arrangement of an eyepiece optical system EL1 according to the first embodiment.
  • the eyepiece optical system EL1 includes, in order from the observation object side, a first lens component G1 having positive refractive power, a second lens component G2 having negative refractive power, and a third lens component G3 having positive refractive power. And a fourth lens component G4 having a positive refractive power.
  • the first lens component G1 is composed of an aspheric positive lens L11 having a biconvex positive lens shape in which the lens surface on the observation object side and the lens surface on the eye point side are aspheric.
  • the second lens component G2 is formed of an aspheric negative lens L12 in the shape of a negative meniscus lens having a lens surface on the observation object side and a lens surface on the eye point side formed aspheric and having a concave surface facing the observation object It is done.
  • the lens surface on the observation object side and the lens surface on the eye point side are formed in an aspheric shape
  • the third lens component G3 is constituted by an aspheric positive lens L31 having a positive meniscus lens shape concave on the object side.
  • the fourth lens component G4 is formed of an aspheric positive lens L41 in the shape of a positive meniscus lens having a lens surface on the observation object side and a lens surface on the eye point side formed in an aspheric shape and having a concave surface facing the observation object It is done.
  • the diopter adjustment in the eyepiece optical system EL1 is performed by moving the entire eyepiece optical system EL1 in the optical axis direction.
  • Table 1 below presents values of specifications of the eyepiece optical system EL1.
  • fe shown in the overall specifications represents the focal length of the entire system
  • H represents the maximum object height
  • TL represents the value of the total length.
  • the first column m in the lens data shows the order (surface number) of the lens surface from the object side along the traveling direction of the light beam
  • the second column r shows the radius of curvature of each lens surface
  • the third column d is the distance on the optical axis from each optical surface to the next optical surface (spacing);
  • the radius of curvature ⁇ indicates a plane
  • the refractive index of air 0000 is omitted.
  • the object plane indicates the observation object O
  • the image plane indicates the eye point EP.
  • the focal length f (fOe, fEe, etc.), radius of curvature r, interplanar spacing d, and other units of length generally used in all the following specification values are generally "mm", but the optical system Is not limited to this, because the same optical performance can be obtained by proportional enlargement or reduction.
  • the explanation of these symbols and the explanation of the specification table are the same in the following embodiments.
  • the surface distance d is an air equivalent length.
  • the first surface, the second surface, the third surface, the fourth surface, the fifth surface, the sixth surface, the seventh surface, and the eighth surface are formed in an aspheric shape.
  • Table 2 below shows data of aspheric surfaces, that is, the values of the conical constant K and the respective aspheric constants A4 to A12.
  • the on-axis air gap D1 between the observation object and the first lens component G1 and the on-axis air gap D2 between the fourth lens component G4 and the eyepoint EP change during diopter adjustment.
  • the entrance pupil position EnP also changes with the change of these intervals.
  • Table 3 below shows variable intervals and dioptric pupil positions for each diopter.
  • the diopter represents -1 [1 / m] as "-1 dpt", +2 [1 / m] as "+2 dpt", and -4 [1 / m] as "-4 dpt". The same applies to the following embodiments.
  • Table 4 shows values corresponding to the respective conditional expressions of the eyepiece optical system EL1.
  • the eyepiece optical system EL1 satisfies the conditional expressions (1) to (11).
  • FIG. 2 shows a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a coma aberration diagram at a standard diopter ( ⁇ 1 dpt) of this eyepiece optical system EL1.
  • the unit of the horizontal axis of the spherical aberration diagram and the astigmatism diagram is “1 / m”, and is indicated by “D” in the diagram.
  • the coma aberration diagram and the magnification chromatic aberration diagram show the components in angle units, and d and g in the diagram show the aberration curve at the d-line and the g-line.
  • the coma aberration diagram shows an aberration curve for each object height.
  • FIG. 3 is a view showing the arrangement of an eyepiece optical system EL2 according to the second embodiment.
  • the eyepiece optical system EL2 includes, in order from the observation object side, a first lens component G1 having positive refractive power, a second lens component G2 having negative refractive power, and a third lens component G3 having positive refractive power. And a fourth lens component G4 having a positive refractive power.
  • the first lens component G1 is composed of an aspheric positive lens L11 having a biconvex positive lens shape in which the lens surface on the observation object side and the lens surface on the eye point side are formed aspheric.
  • the second lens component G2 is formed of an aspheric negative lens L12 in the shape of a negative meniscus lens having a lens surface on the observation object side and a lens surface on the eye point side formed aspheric and having a concave surface facing the observation object It is done.
  • the lens surface on the observation object side and the lens surface on the eye point side are formed in an aspheric shape
  • the third lens component G3 is constituted by an aspheric positive lens L31 having a positive meniscus lens shape concave on the object side.
  • the fourth lens component G4 is formed of an aspheric positive lens L41 in the shape of a positive meniscus lens having a lens surface on the observation object side and a lens surface on the eye point side formed in an aspheric shape and having a concave surface facing the observation object It is done.
  • the diopter adjustment in the eyepiece optical system EL2 is performed by moving the entire eyepiece optical system EL2 in the optical axis direction.
  • Table 5 below presents values of specifications of the eyepiece optical system EL2.
  • the first surface, the second surface, the third surface, the fourth surface, the fifth surface, the sixth surface, the seventh surface, and the eighth surface are formed in an aspheric shape.
  • Table 6 below shows data of aspheric surfaces, that is, the values of the conical constant K and the respective aspheric constants A4 to A12.
  • the on-axis air gap D1 between the observation object and the first lens component G1 and the on-axis air gap D2 between the fourth lens component G4 and the eyepoint EP change during diopter adjustment.
  • the entrance pupil position EnP also changes with the change of these intervals. Table 7 below shows variable intervals and dioptric pupil positions for each diopter.
  • Table 8 shows values corresponding to the respective conditional expressions of the eyepiece optical system EL2.
  • the eyepiece optical system EL2 satisfies the conditional expressions (1) to (10).
  • FIG. 4 shows a spherical aberration diagram, an astigmatism diagram, a distortion aberration diagram and a coma aberration diagram of the eyepiece optical system EL2 at a standard diopter (-1 dpt). From these aberration diagrams, it can be seen that this eyepiece optical system EL2 achieves good aberration within the diopter adjustment range.
  • FIG. 5 is a view showing the arrangement of an eyepiece optical system EL3 according to the third embodiment.
  • the eyepiece optical system EL3 includes, in order from the observation object side, a first lens component G1 having positive refractive power, a second lens component G2 having negative refractive power, and a third lens component G3 having positive refractive power. And a fourth lens component G4 having a positive refractive power.
  • the first lens component G1 is composed of an aspheric positive lens L11 having a biconvex positive lens shape in which the lens surface on the observation object side and the lens surface on the eye point side are aspheric.
  • the second lens component G2 is formed of a biconcave negative lens-shaped aspheric negative lens L12 in which the lens surface on the observation object side is formed in an aspheric shape.
  • the third lens component G3 is composed of an aspheric positive lens L31 having a biconvex positive lens shape in which the lens surface on the eye point side is formed in an aspheric shape.
  • the fourth lens component G4 is formed of an aspheric positive lens L41 in the shape of a positive meniscus lens having a lens surface on the observation object side and a lens surface on the eye point side formed in an aspheric shape and having a concave surface facing the observation object It is done.
  • the diopter adjustment in the eyepiece optical system EL3 is performed by moving the entire eyepiece optical system EL3 in the optical axis direction.
  • Table 9 presents values of specifications of the eyepiece optical system EL3.
  • the first surface, the second surface, the third surface, the sixth surface, the seventh surface, and the eighth surface are formed in an aspheric shape.
  • Table 10 below shows data of aspheric surfaces, that is, values of the conical constant K and the respective aspheric constants A4 to A12.
  • the on-axis air gap D1 between the observation object and the first lens component G1 and the on-axis air gap D2 between the fourth lens component G4 and the eyepoint EP change during diopter adjustment.
  • the entrance pupil position EnP also changes with the change of these intervals. Table 11 below shows variable intervals and dioptric pupil positions for each diopter.
  • Table 12 shows values corresponding to the respective conditional expressions of the eyepiece optical system EL3.
  • the eyepiece optical system EL3 satisfies the conditional expressions (1) to (11).
  • FIG. 6 shows a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a coma aberration diagram at a standard diopter ( ⁇ 1 dpt) of this eyepiece optical system EL3. From these aberration diagrams, it can be seen that this eyepiece optical system EL3 achieves good aberration within the diopter adjustment range.
  • FIG. 7 is a view showing the arrangement of an eyepiece optical system EL4 according to the fourth embodiment.
  • the eyepiece optical system EL4 includes, in order from the observation object side, a first lens component G1 having a positive refractive power, a second lens component G2 having a negative refractive power, and a third lens component G3 having a positive refractive power. And a fourth lens component G4 having a positive refractive power.
  • the first lens component G1 is composed of an aspheric positive lens L11 having a biconvex positive lens shape in which the lens surface on the observation object side and the lens surface on the eye point side are aspheric.
  • the second lens component G2 is formed of an aspheric negative lens L12 in the shape of a negative meniscus lens having a lens surface on the observation object side and a lens surface on the eye point side formed aspheric and having a concave surface facing the observation object It is done.
  • the third lens component G3 is formed of an aspheric positive lens L31 in the shape of a positive meniscus lens whose lens surface on the observation object side and the lens surface on the eye point side are aspheric and whose concave surface is directed to the observation object It is done.
  • the fourth lens component G4 is formed of an aspheric positive lens L41 in the shape of a positive meniscus lens having a lens surface on the observation object side and a lens surface on the eye point side formed in an aspheric shape and having a concave surface facing the observation object It is done.
  • the diopter adjustment in the eyepiece optical system EL4 is performed by moving the entire eyepiece optical system EL4 in the optical axis direction.
  • Table 13 below provides values of specifications of the eyepiece optical system EL4.
  • the first surface, the second surface, the third surface, the fourth surface, the fifth surface, the sixth surface, the seventh surface, and the eighth surface are formed in an aspheric shape.
  • Table 14 below shows data of aspheric surfaces, that is, the values of the conical constant K and the respective aspheric constants A4 to A12.
  • the on-axis air gap D1 between the observation object and the first lens component G1 and the on-axis air gap D2 between the fourth lens component G4 and the eyepoint EP change during diopter adjustment.
  • the entrance pupil position EnP also changes with the change of these intervals. Table 15 below shows variable intervals and dioptric pupil positions for each diopter.
  • Table 16 shows values corresponding to the respective conditional expressions of the eyepiece optical system EL4.
  • the eyepiece optical system EL4 satisfies the conditional expressions (1) to (11).
  • FIG. 8 shows a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a coma aberration diagram of the eyepiece optical system EL4 at a standard diopter (-1 dpt). From these aberration diagrams, it can be seen that this eyepiece optical system EL4 achieves good aberration within the diopter adjustment range.
  • FIG. 9 is a view showing the configuration of the eyepiece optical system EL5 according to the fifth example.
  • the eyepiece optical system EL5 includes, in order from the observation object side, a first lens component G1 having positive refractive power, a second lens component G2 having negative refractive power, and a third lens component G3 having positive refractive power. And a fourth lens component G4 having a positive refractive power.
  • the first lens component G1 is composed of an aspheric positive lens L11 having a biconvex positive lens shape in which the lens surface on the observation object side and the lens surface on the eye point side are aspheric.
  • the second lens component G2 is formed of an aspheric negative lens L12 in the shape of a negative meniscus lens having a lens surface on the observation object side and a lens surface on the eye point side formed aspheric and having a concave surface facing the observation object It is done.
  • the third lens component G3 is formed of an aspheric positive lens L31 in the shape of a positive meniscus lens whose lens surface on the observation object side and the lens surface on the eye point side are aspheric and whose concave surface is directed to the observation object It is done.
  • the fourth lens component G4 is formed of an aspheric positive lens L41 in the shape of a positive meniscus lens having a lens surface on the observation object side and a lens surface on the eye point side formed in an aspheric shape and having a concave surface facing the observation object It is done.
  • the diopter adjustment in the eyepiece optical system EL5 is performed by moving the entire eyepiece optical system EL5 in the optical axis direction.
  • Table 17 below provides values of specifications of the eyepiece optical system EL5.
  • the first surface, the second surface, the third surface, the fourth surface, the fifth surface, the sixth surface, the seventh surface, and the eighth surface are formed in an aspheric shape.
  • Table 18 below shows data of aspheric surfaces, that is, values of the conical constant K and the respective aspheric constants A4 to A12.
  • the on-axis air gap D1 between the observation object and the first lens component G1 and the on-axis air gap D2 between the fourth lens component G4 and the eyepoint EP change during diopter adjustment.
  • the entrance pupil position EnP also changes with the change of these intervals. Table 19 below shows variable intervals and dioptric pupil positions for each diopter.
  • Table 20 shows the corresponding values to the conditional expressions of the eyepiece optical system EL5.
  • the eyepiece optical system EL5 satisfies the conditional expressions (1) to (10).
  • FIG. 10 shows a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a coma aberration diagram of the eyepiece optical system EL5 at a standard diopter (-1 dpt). From these aberration diagrams, it can be seen that this eyepiece optical system EL5 achieves good aberration within the diopter adjustment range.
  • FIG. 11 is a diagram showing the configuration of an eyepiece optical system EL6 according to a sixth example.
  • the eyepiece optical system EL6 includes, in order from the observation object side, a first lens component G1 having positive refractive power, a second lens component G2 having negative refractive power, and a third lens component G3 having positive refractive power. And a fourth lens component G4 having a positive refractive power.
  • the first lens component G1 is composed of an aspheric positive lens L11 having a biconvex positive lens shape in which the lens surface on the observation object side and the lens surface on the eye point side are aspheric.
  • the second lens component G2 is formed of an aspheric negative lens L12 in the shape of a negative meniscus lens having a lens surface on the observation object side and a lens surface on the eye point side formed aspheric and having a concave surface facing the observation object It is done.
  • the third lens component G3 is formed of an aspheric positive lens L31 in the shape of a positive meniscus lens whose lens surface on the observation object side and the lens surface on the eye point side are aspheric and whose concave surface is directed to the observation object It is done.
  • the fourth lens component G4 is composed of an aspheric positive lens L41 having a biconvex positive lens shape in which the lens surface on the observation object side and the lens surface on the eye point side are aspheric.
  • the diopter adjustment in the eyepiece optical system EL6 is performed by moving the entire eyepiece optical system EL6 in the optical axis direction.
  • Table 21 below provides values of specifications of the eyepiece optical system EL6.
  • the first surface, the second surface, the third surface, the fourth surface, the fifth surface, the sixth surface, the seventh surface, and the eighth surface are formed in an aspheric shape.
  • the following Table 22 shows data of aspheric surfaces, that is, the values of the conical constant K and the respective aspheric constants A4 to A12.
  • the on-axis air gap D1 between the observation object and the first lens component G1 and the on-axis air gap D2 between the fourth lens component G4 and the eyepoint EP change during diopter adjustment.
  • the entrance pupil position EnP also changes with the change of these intervals. Table 23 below shows variable intervals and dioptric pupil positions for each diopter.
  • Table 24 shows the corresponding values to the conditional expressions of the eyepiece optical system EL6.
  • the eyepiece optical system EL6 satisfies the conditional expressions (1) to (10).
  • FIG. 12 shows a spherical aberration diagram, an astigmatism diagram, a distortion diagram, and a coma aberration diagram at a standard diopter ( ⁇ 1 dpt) of this eyepiece optical system EL6. From these aberration diagrams, it can be seen that this eyepiece optical system EL6 achieves good aberration within the diopter adjustment range.
  • FIG. 13 is a diagram showing the configuration of an eyepiece optical system EL7 according to a seventh example.
  • the eyepiece optical system EL7 includes, in order from the observation object side, a first lens component G1 having a positive refractive power, a second lens component G2 having a negative refractive power, and a third lens component G3 having a positive refractive power. And a fourth lens component G4 having a positive refractive power.
  • the first lens component G1 is composed of an aspheric positive lens L11 having a biconvex positive lens shape in which the lens surface on the observation object side and the lens surface on the eye point side are aspheric.
  • the second lens component G2 is formed of an aspheric negative lens L12 having a negative meniscus lens shape with a concave surface facing the observation object.
  • the third lens component G3 is formed of an aspheric positive lens L31 having a positive meniscus lens shape with a concave surface facing the observation object.
  • the fourth lens component G4 is composed of an aspheric positive lens L41 having a biconvex positive lens shape in which the lens surface on the observation object side and the lens surface on the eye point side are aspheric.
  • the diopter adjustment in the eyepiece optical system EL7 is performed by moving the entire eyepiece optical system EL7 in the optical axis direction.
  • Table 25 presents values of specifications of the eyepiece optical system EL7.
  • the first surface, the second surface, the third surface, the sixth surface, the seventh surface, and the eighth surface are formed in an aspheric shape.
  • the following Table 26 shows aspheric surface data, that is, the values of the conical constant K and the respective aspheric constants A4 to A12.
  • the on-axis air gap D1 between the observation object and the first lens component G1 and the on-axis air gap D2 between the fourth lens component G4 and the eyepoint EP change during diopter adjustment.
  • the entrance pupil position EnP also changes with the change of these intervals. Table 27 below shows variable intervals and dioptric pupil positions for each diopter.
  • Table 28 shows values corresponding to the respective conditional expressions of the eyepiece optical system EL7.
  • the eyepiece optical system EL7 satisfies the conditional expressions (1) to (11).
  • FIG. 14 shows a spherical aberration diagram, an astigmatism diagram, a distortion aberration diagram and a coma aberration diagram of the eyepiece optical system EL7 at a standard diopter ( ⁇ 1 dpt). From these aberration diagrams, it can be seen that this eyepiece optical system EL7 achieves good aberration within the diopter adjustment range.
  • FIG. 15 is a view showing the configuration of an eyepiece optical system EL8 according to an eighth example.
  • the eyepiece optical system EL8 includes, in order from the observation object side, a first lens component G1 having a positive refractive power, a second lens component G2 having a negative refractive power, and a third lens component G3 having a positive refractive power. And a fourth lens component G4 having a positive refractive power.
  • the first lens component G1 has an aspheric positive lens L11 having a biconvex positive lens shape in which the lens surface on the observation object side is aspheric, and an aspheric lens surface on the eye point side And a cemented lens obtained by cementing a positive meniscus lens-shaped aspheric positive lens L12 having a concave surface facing the observation object.
  • the second lens component G2 is formed of an aspheric negative lens L12 having a negative meniscus lens shape with a concave surface facing the observation object.
  • the third lens component G3 is formed of an aspheric positive lens L31 having a positive meniscus lens shape with a concave surface facing the observation object.
  • the fourth lens component G4 is formed of an aspheric positive lens L41 in the shape of a positive meniscus lens having a lens surface on the observation object side and a lens surface on the eye point side formed in an aspheric shape and having a concave surface facing the observation object It is done.
  • the diopter adjustment in the eyepiece optical system EL8 is performed by moving the entire eyepiece optical system EL8 in the optical axis direction.
  • Table 29 below provides values of specifications of the eyepiece optical system EL8.
  • the first surface, the third surface, the fourth surface, the seventh surface, the eighth surface and the ninth surface are formed in an aspheric shape.
  • the following Table 30 shows data of aspheric surfaces, that is, the values of the conical constant K and the respective aspheric constants A4 to A12.
  • the on-axis air gap D1 between the observation object and the first lens component G1 and the on-axis air gap D2 between the fourth lens component G4 and the eyepoint EP change during diopter adjustment.
  • the entrance pupil position EnP also changes with the change of these intervals. Table 31 below shows variable intervals for each diopter and entrance pupil positions.
  • Table 32 below shows the corresponding values to the conditional expressions of the eyepiece optical system EL8.
  • the eyepiece optical system EL8 satisfies the conditional expressions (1) to (11).
  • the spherical aberration view, the astigmatism view, the distortion view and the coma view of the eyepiece optical system EL8 at a standard diopter (-1 dpt) are shown in FIG. From these aberration diagrams, it can be seen that this eyepiece optical system EL8 achieves good aberration within the diopter adjustment range.
  • FIG. 17 is a view showing the configuration of an eyepiece optical system EL9 according to a ninth example.
  • the eyepiece optical system EL9 includes, in order from the observation object side, a first lens component G1 having positive refractive power, a second lens component G2 having negative refractive power, and a third lens component G3 having positive refractive power. And a fourth lens component G4 having a positive refractive power.
  • the first lens component G1 is composed of an aspheric positive lens L11 having a biconvex positive lens shape in which the lens surface on the observation object side and the lens surface on the eye point side are aspheric.
  • the second lens component G2 is formed of an aspheric negative lens L12 having a negative meniscus lens shape with a concave surface facing the observation object.
  • the third lens component G3 is formed of an aspheric positive lens L31 having a positive meniscus lens shape with a concave surface facing the observation object.
  • the fourth lens component G4 is formed of an aspheric positive lens L41 in the shape of a positive meniscus lens having a lens surface on the observation object side and a lens surface on the eye point side formed in an aspheric shape and having a concave surface facing the observation object It is done.
  • the diopter adjustment in the eyepiece optical system EL9 is performed by moving the entire eyepiece optical system EL9 in the optical axis direction.
  • Table 33 below provides values of specifications of the eyepiece optical system EL9.
  • the first surface, the second surface, the third surface, the sixth surface, the seventh surface, and the eighth surface are formed in an aspheric shape.
  • Table 34 below shows data of aspheric surfaces, that is, the values of the conical constant K and the respective aspheric constants A4 to A12.
  • the on-axis air gap D1 between the observation object and the first lens component G1 and the on-axis air gap D2 between the fourth lens component G4 and the eyepoint EP change during diopter adjustment.
  • the entrance pupil position EnP also changes with the change of these intervals. Table 35 below shows variable intervals and dioptric pupil positions for each diopter.
  • the eyepiece optical system EL9 satisfies the conditional expressions (1) to (12).
  • the spherical aberration view, the astigmatism view, the distortion view, and the coma view of the eyepiece optical system EL9 at a standard diopter (-1 dpt) are shown in FIG. From these aberration diagrams, it can be seen that this eyepiece optical system EL9 achieves good aberration within the diopter adjustment range.
  • FIG. 19 is a diagram showing the configuration of an eyepiece optical system EL10 according to a tenth example.
  • the eyepiece optical system EL10 includes, in order from the observation object side, a first lens component G1 having a positive refractive power, a second lens component G2 having a negative refractive power, and a third lens component G3 having a positive refractive power. And a fourth lens component G4 having a positive refractive power.
  • the first lens component G1 is composed of an aspheric positive lens L11 having a biconvex positive lens shape in which the lens surface on the observation object side and the lens surface on the eye point side are aspheric.
  • the second lens component G2 is configured of an aspheric negative lens L21 having a negative meniscus lens shape whose concave surface is directed to the observation object side, with the lens surface on the observation object side and the lens surface on the eye point side being aspheric. It is done.
  • the third lens component G3 is formed of an aspheric positive lens L31 in the shape of a positive meniscus lens whose lens surface on the observation object side and the lens surface on the eye point side are aspheric and whose concave surface is directed to the observation object It is done.
  • the fourth lens component G4 is formed of an aspheric positive lens L41 in the shape of a positive meniscus lens having a lens surface on the observation object side and a lens surface on the eye point side formed in an aspheric shape and having a concave surface facing the observation object It is done.
  • the diopter adjustment in the eyepiece optical system EL10 is performed by moving the entire eyepiece optical system EL10 in the optical axis direction.
  • Table 37 below provides values of specifications of the eyepiece optical system EL10.
  • the first surface, the second surface, the third surface, the fourth surface, the fifth surface, the sixth surface, the seventh surface, and the eighth surface are formed in an aspheric shape.
  • the following Table 38 shows aspheric surface data, that is, values of the conical constant K and the respective aspheric constants A4 to A12.
  • the on-axis air gap D1 between the observation object and the first lens component G1 and the on-axis air gap D2 between the fourth lens component G4 and the eyepoint EP change during diopter adjustment.
  • the entrance pupil position EnP also changes with the change of these intervals. Table 39 below shows variable intervals and dioptric pupil positions for each diopter.
  • the eyepiece optical system EL10 satisfies the conditional expressions (1) to (12).
  • the spherical aberration view, the astigmatism view, the distortion view and the coma view of the eyepiece optical system EL10 at a standard diopter (-1 dpt) are shown in FIG. From these aberration diagrams, it can be seen that in this eyepiece optical system EL10, good aberration is achieved within the diopter adjustment range.
  • FIG. 21 is a diagram showing the configuration of an eyepiece optical system EL11 according to an eleventh example.
  • the eyepiece optical system EL11 includes, in order from the observation object side, a first lens component G1 having positive refractive power, a second lens component G2 having negative refractive power, and a third lens component G3 having positive refractive power. And a fourth lens component G4 having a positive refractive power.
  • the first lens component G1 is composed of an aspheric positive lens L11 having a biconvex positive lens shape in which a lens surface on the observation object side is formed in an aspheric shape.
  • the second lens component G2 is a biconcave negative lens-shaped aspheric negative lens L21 in which the lens surface on the observation object side is aspheric, and a lens surface in the eyepoint side is aspheric. It is comprised with the cemented lens which joined the aspheric positive lens L22 of convex positive lens shape.
  • the third lens component G3 is formed of an aspheric positive lens L31 having a positive meniscus lens shape with a concave surface facing the observation object.
  • the fourth lens component G4 is formed of an aspheric positive lens L41 in the shape of a positive meniscus lens having a lens surface on the observation object side and a lens surface on the eye point side formed in an aspheric shape and having a concave surface facing the observation object It is done.
  • the diopter adjustment in the eyepiece optical system EL11 is performed by moving the entire eyepiece optical system EL11 in the optical axis direction.
  • Table 41 below provides values of specifications of the eyepiece optical system EL11.
  • the first surface, the third surface, the fifth surface, the seventh surface, the eighth surface and the ninth surface are formed in an aspheric shape.
  • the following Table 42 shows aspheric surface data, that is, the values of the conical constant K and the respective aspheric constants A4 to A12.
  • the on-axis air gap D1 between the observation object and the first lens component G1 and the on-axis air gap D2 between the fourth lens component G4 and the eyepoint EP change during diopter adjustment.
  • the entrance pupil position EnP also changes with the change of these intervals. Table 43 below shows variable intervals and dioptric pupil positions for each diopter.
  • the eyepiece optical system EL10 satisfies the conditional expressions (1) to (11).
  • the spherical aberration view, the astigmatism view, the distortion view, and the coma view of the eyepiece optical system EL11 at a standard diopter (-1 dpt) are shown in FIG. From these aberration diagrams, it can be seen that in this eyepiece optical system EL11, good aberration is achieved within the diopter adjustment range.
  • the thing of the composition of four lens components was shown as a numerical example of eyepiece optical system EL, it is applicable also to other lens composition, such as five lens components, for example. Further, the lens component may be added to the most object side or the lens component may be added to the most eye point side.
  • one or more lens components are moved so as to have a displacement component in the direction orthogonal to the optical axis, or rotationally moved (sway) in the in-plane direction including the optical axis to correct image blurring caused by camera shake. It is good also as an anti-vibration lens group.
  • the third lens component G3 it is preferable to use the third lens component G3 as a vibration reduction lens group.
  • the lens surface of the lens (lens component, lens element) constituting the eyepiece optical system EL of the present embodiment may be a spherical surface, a flat surface, or an aspheric surface.
  • the lens surface is spherical or flat, it is preferable because lens processing and assembly adjustment can be facilitated, and deterioration of optical performance due to lens processing and assembly adjustment errors can be prevented.
  • the image plane shifts it is preferable because there is little deterioration in the imaging performance.
  • the lens surface is aspheric, it is either aspheric by grinding, a glass mold aspheric obtained by molding glass into an aspheric shape, or a composite aspheric made by forming a resin provided on the surface of glass into an aspheric shape. May be.
  • the lens surface may be a diffractive surface, and the lens may be a gradient index lens (GRIN lens) or a plastic lens.
  • lens surface of the lens (lens component, lens element) constituting the eyepiece optical system EL of the present embodiment flare and ghost are reduced, and high contrast optical performance is achieved in a wide wavelength range.
  • An antireflective film having high transmittance may be provided.
  • the first lens component G1, the second lens component G2, the third lens component G3, and the fourth lens component G4 are integrated, or the entire eyepiece optical system EL is integrally moved.
  • the lens component on the eye point side is fixed most, and the entire lens component on the observation object side with respect to the lens component is integrally moved, or the first lens component G1 and the first lens component G1 are
  • the configuration may be such that at least a part of lens components of the two-lens component G2, the third lens component G3, and the fourth lens component G4 are moved.
  • the diopter adjustment lens group is preferably composed of a single lens.

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Abstract

L'invention concerne : un système optique à oculaire EL présentant des performances optiques avantageuses et une puissance de grossissement d'observation élevée ; un dispositif optique comprenant ce système optique à oculaire EL ; et un procédé de production d'un système optique à oculaire. Ce système optique à oculaire EL satisfait à l'expression conditionnelle suivante, et comprend, dans cet ordre à partir du côté de l'objet d'observation : un premier composant lentille ayant une réfringence positive ; un deuxième composant lentille ayant une réfringence négative ; un troisième composant lentille ayant une réfringence positive ; et un quatrième composant lentille ayant une réfringence positive. 1,38 < fe/f1 < 3,00 ; fe représente la distance focale de l'ensemble du système optique à oculaire EL ; f1 représente la distance focale du premier composant lentille G1 ; et un « composant lentille » désigne une lentille unique ou une lentille cimentée.
PCT/JP2018/033570 2017-09-15 2018-09-11 Système optique à oculaire, dispositif optique et procédé de production de système optique à oculaire WO2019054359A1 (fr)

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JP2019542058A JP7037730B2 (ja) 2017-09-15 2018-09-11 接眼光学系及び光学機器
JP2022032904A JP7280561B2 (ja) 2017-09-15 2022-03-03 接眼光学系及び撮像装置

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JP2022066386A (ja) * 2017-09-15 2022-04-28 株式会社ニコン 接眼光学系及び撮像装置

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JP2013088632A (ja) * 2011-10-18 2013-05-13 Ricoh Opt Ind Co Ltd 接眼レンズ系およびビューファインダおよび画像観察装置および画像撮影装置
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CN111694147A (zh) * 2020-06-24 2020-09-22 深圳珑璟光电技术有限公司 一种目镜镜头及目镜光学系统
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