WO2023218819A1 - 観察光学系および光学機器 - Google Patents

観察光学系および光学機器 Download PDF

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Publication number
WO2023218819A1
WO2023218819A1 PCT/JP2023/014333 JP2023014333W WO2023218819A1 WO 2023218819 A1 WO2023218819 A1 WO 2023218819A1 JP 2023014333 W JP2023014333 W JP 2023014333W WO 2023218819 A1 WO2023218819 A1 WO 2023218819A1
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Prior art keywords
optical system
prism
rotation
erecting
erecting prism
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English (en)
French (fr)
Japanese (ja)
Inventor
賢典 富田
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Nikon Vision Co Ltd
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Nikon Vision Co Ltd
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Priority to JP2024520302A priority Critical patent/JP7795621B2/ja
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/02—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B25/00—Eyepieces; Magnifying glasses
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing

Definitions

  • the present invention relates to an observation optical system and an optical instrument.
  • the necessary rotation angle of the prism is large relative to the image blur correction angle, and there is a problem in that the optical performance deteriorates due to eccentric aberrations caused by the rotation of the prism.
  • the observation optical system includes, in order from the object side, an objective optical system, an erecting prism for erecting an image formed by the objective optical system, and an erecting prism for erecting an image formed by the objective optical system.
  • an eyepiece optical system for observing an image formed by the objective optical system the observation optical system correcting the image by rotating the erecting prism from a predetermined position, , the rotation center for rotating the erecting prism is the intersection of the surface of the erecting prism closest to the objective optical system and the optical axis of the objective optical system when the erecting prism is located at the predetermined position. from the position of the erecting prism in the direction along the optical axis of the objective optical system.
  • the observation optical system includes, in order from the object side, an objective optical system, an erecting prism for erecting an image formed by the objective optical system, and an erecting prism for erecting an image formed by the objective optical system.
  • an eyepiece optical system for observing an image formed by the objective optical system the observation optical system correcting the image by rotating the erecting prism from a predetermined position, , the center of rotation for rotating the erecting prism is the surface of the erecting prism closest to the objective optical system and the surface of the objective lens closest to the erecting prism when the erecting prism is located at the predetermined position. It is located between the surface closest to the surface.
  • An optical instrument according to the present invention includes the observation optical system described above.
  • FIG. 3 is a side view showing the lens configuration of the observation optical system according to the first example.
  • FIG. 3 is a cross-sectional view showing the lens configuration of the observation optical system according to the first example.
  • FIG. 3 is an optical path diagram of the observation optical system according to the first example.
  • FIG. 2 is a perspective view showing the configuration of an erecting prism of the observation optical system according to the first example.
  • FIG. 3 is a diagram showing the prism rotation center position of the observation optical system according to the first example.
  • FIG. 4 is a diagram of various aberrations before the prism rotation of the observation optical system according to the first example.
  • FIG. 3 is a diagram of lateral aberration before prism rotation of the observation optical system according to the first example.
  • FIG. 3 is a diagram of lateral aberration after prism rotation of the observation optical system according to the first example.
  • FIG. 3 is a diagram showing a spot diagram before prism rotation of the observation optical system according to the first example.
  • FIG. 7 is a diagram showing a spot diagram after the prism rotation of the observation optical system according to the first example.
  • FIG. 7 is a lateral aberration diagram after the prism rotation of the observation optical system according to the second example.
  • FIG. 7 is a diagram showing a spot diagram after the prism rotation of the observation optical system according to the second example.
  • FIG. 7 is a diagram of transverse aberration after prism rotation of the observation optical system according to the third example.
  • FIG. 7 is a diagram showing a spot diagram after prism rotation of the observation optical system according to the third example.
  • FIG. 7 is a diagram of lateral aberration after prism rotation of the observation optical system according to the fourth example. It is a figure which shows the spot diagram after prism rotation of the observation optical system based on 4th Example.
  • FIG. 7 is a side view showing a lens configuration of an observation optical system according to a fifth example.
  • FIG. 7 is a cross-sectional view showing a lens configuration of an observation optical system according to a fifth example.
  • FIG. 7 is a diagram showing the prism rotation center position of the observation optical system according to the fifth example.
  • FIG. 7 is a diagram of various aberrations before the prism rotation of the observation optical system according to the fifth example.
  • FIG. 7 is a diagram of lateral aberration before prism rotation of the observation optical system according to the fifth example.
  • FIG. 7 is a diagram of lateral aberration after prism rotation of the observation optical system according to the fifth example. It is a figure which shows the spot diagram before prism rotation of the observation optical system based on 5th Example. It is a figure which shows the spot diagram after prism rotation of the observation optical system based on 5th Example.
  • FIG. 7 is a diagram of lateral aberration after prism rotation of the observation optical system according to the sixth example. It is a figure which shows the spot diagram after prism rotation of the observation optical system based on 6th Example.
  • FIG. 7 is a diagram of lateral aberration after prism rotation of the observation optical system according to the seventh example. It is a figure which shows the spot diagram after prism rotation of the observation optical system based on 7th Example.
  • FIG. 7 is a diagram of lateral aberration after prism rotation of the observation optical system according to the fifth example. It is a figure which shows the spot diagram before prism rotation of the observation optical system based on 5th Example. It is a figure which shows the spot diagram
  • FIG. 12 is a diagram of lateral aberration after prism rotation of the observation optical system according to the eighth example. It is a figure which shows the spot diagram after prism rotation of the observation optical system based on 8th Example.
  • FIG. 7 is a transverse aberration diagram after prism rotation of the observation optical system according to the first reference example. It is a figure which shows the spot diagram after prism rotation of the observation optical system based on 1st reference example.
  • FIG. 7 is a diagram of lateral aberration after prism rotation of the observation optical system according to the second reference example. It is a figure which shows the spot diagram after prism rotation of the observation optical system based on a 2nd reference example.
  • FIG. 7 is a diagram of lateral aberration after prism rotation of the observation optical system according to the third reference example.
  • FIG. 12 is a diagram of lateral aberration after prism rotation of the observation optical system according to the fourth reference example. It is a figure which shows the spot diagram after prism rotation of the observation optical system based on the 4th reference example. It is a transverse aberration diagram after prism rotation of the observation optical system according to the fifth reference example. It is a figure which shows the spot diagram after prism rotation of the observation optical system based on the 5th reference example.
  • FIG. 12 is a diagram of lateral aberration after prism rotation of the observation optical system according to the sixth reference example.
  • FIG. 7 is a table showing specification data of observation optical systems according to the first to fourth embodiments and the first to third reference examples. 7 is a graph showing the relationship between the image blur correction angle and the rotation angle of the prism at each rotation center position P0 to P6. FIG. 7 is a graph showing the relationship between image blur correction angle and angular deviation at each rotation center position P0 to P6. FIG. FIG. 7 is a table showing specification data of observation optical systems according to fifth to eighth embodiments and fourth to sixth reference examples. 7 is a graph showing the relationship between the image blur correction angle and the prism rotation angle at each rotation center position Q0 to Q6. FIG.
  • FIG. 7 is a graph showing the relationship between image blur correction angle and angular deviation at each rotation center position Q0 to Q6.
  • FIG. FIG. 3 is a diagram illustrating a rotation angle and an image blur correction angle of a prism in an observation optical system.
  • FIG. 3 is a diagram illustrating the coordinates of each point on an erecting prism before prism rotation in the observation optical system.
  • FIG. 6 is a diagram illustrating the coordinates of each point on the erecting prism after the prism rotation in the observation optical system.
  • FIG. 3 is a developed diagram of an erecting prism in the observation optical system.
  • FIG. 6 is a diagram showing an example of the arrangement of the objective optical system and the erecting prism after the prism rotation in the observation optical system.
  • FIG. 3 is a diagram showing the back focus of the objective optical system in the observation optical system. It is a sectional view of binoculars.
  • the binoculars BFG include two observation optical systems LS1, LS1 for observing objects, and a mirror body BD that holds the two observation optical systems LS1, LS1 arranged in parallel on the left and right. It consists of a main body.
  • the two observation optical systems LS1 and LS1 each include an objective optical system OBL1 that condenses an incident light beam to form an image, and an erecting prism PR1 that erects the image formed by the objective optical system OBL1.
  • an eyepiece optical system EPL1 for observing the image formed by the objective optical system OBL1.
  • light from an object is collected by the objective optical system OBL1 and reaches the erecting optical system PR1.
  • the light that has reached the erecting optical system PR1 is reflected multiple times by the erecting optical system PR1 and is guided to the eyepiece optical system EPL1. Thereby, the observer can observe the image of the object as an erect image via the eyepiece optical system EPL1.
  • the erecting prism PR1 in the two observation optical systems LS1 and LS1 rotates around a predetermined rotation center position (point P0 in the figure) when camera shake or the like occurs, and is formed by the objective optical system OBL1.
  • Image correction image blur correction
  • the erecting prism PR1 is rotationally driven by a rotating device (not shown) including a stepping motor, a rotary actuator, a voice coil motor, and the like.
  • observation optical system LS1 includes, in order from the object side, an objective optical system OBL1, an erecting prism PR1 for erecting an image formed by the objective optical system OBL1, and an image formed by the objective optical system OBL1.
  • the observation optical system includes an eyepiece optical system EPL1 for observation, and performs image correction by rotating an erecting prism PR1 from a predetermined position.
  • the center of rotation for rotating the erecting prism PR1 is the surface of the erecting prism PR1 closest to the objective optical system OBL1 (referred to as "front prism surface PR11a") when the erecting prism PR1 is located at a predetermined position. It is located within a distance range of one quarter or less of the length of the erecting prism PR1 in the direction along the optical axis Z11 of the objective optical system OBL1 from the position of the intersection with the optical axis Z11 of the objective optical system OBL1.
  • the predetermined position of the erecting prism PR1 refers to the position of the erecting prism PR1 when the front prism surface PR11a of the erecting prism PR1 is perpendicular to the optical axis Z11 of the objective optical system OBL1.
  • the prism reference position it is also referred to as the prism reference position.
  • the rotation angle of the erecting prism PR1 when it is at the prism reference position is 0 [°].
  • the center of rotation of the erecting prism PR1 is the surface of the erecting prism PR1 closest to the objective optical system OBL1 (front prism surface PR11a) and the objective optical system when the erecting prism PR1 is located at a predetermined position (prism reference position).
  • a straight line passing through the intersection of OBL1 with optical axis Z11 and the intersection of the surface of erecting prism PR1 closest to eyepiece optical system EPL1 (referred to as "rear prism surface PR12a") and optical axis Z12 of eyepiece optical system EPL1 Preferably located at the top.
  • the center of rotation of the erecting prism PR1 is preferably located within the erecting prism PR1. That is, the rotation center of the erecting prism PR1 is a length of 4 in the direction along the optical axis Z11 of the objective optical system OBL1 of the erecting prism PR1 from the intersection of the front prism surface PR11a and the optical axis Z11 of the objective optical system OBL1.
  • a virtual plane perpendicular to the optical axis Z11 is set at a position separated by 1/2, it is preferable that the prism be located within the erecting prism PR1 sandwiched between the virtual plane and the front prism surface PR11a.
  • observation optical system LS1 satisfies the following conditional expression (A1).
  • ⁇ the angular magnification of the objective optical system.
  • Conditional expression (A1) is a conditional expression regarding the angular magnification of observation optical system LS1. If the lower limit of conditional expression (A1) is not reached, a sufficient image blur correction angle cannot be obtained for the rotation angle of the erecting prism PR1. If the upper limit of conditional expression (A1) is exceeded, the image blur correction angle with respect to the rotation angle of the erecting prism PR1 becomes too large, and the fluctuation of the image due to the rotation of the erecting prism PR1 increases, making it difficult to obtain a good image. cannot be observed.
  • conditional expression (A1) when the observation optical system LS1 satisfies conditional expression (A1), it is possible to obtain a sufficient image blur correction angle with respect to the rotation angle of the erecting prism PR1, and a good image can be observed during image blur correction. can do.
  • observation optical system LS1 As the observation optical system according to the second embodiment, the observation optical system LS1 shown in FIG. 1 will be referred to.
  • This observation optical system LS1 includes, in order from the object side, an objective optical system OBL1, an erecting prism PR1 for erecting an image formed by the objective optical system OBL1, and an image formed by the objective optical system OBL1.
  • the observation optical system includes an eyepiece optical system EPL1 for observation, and performs image correction by rotating an erecting prism PR1 from a predetermined position.
  • the center of rotation for rotating the erecting prism PR1 is the surface of the erecting prism PR1 closest to the objective optical system OBL1 (front prism surface PR11a) when the erecting prism PR1 is located at a predetermined position (prism reference position). and the surface of the objective optical system OBL1 that is closest to the objective optical system OBL1.
  • observation optical system LS1 observation optical system according to the second embodiment
  • the center of rotation of the erecting prism PR1 is the surface of the erecting prism PR1 closest to the objective optical system OBL1 (front prism surface PR11a) and the objective optical system when the erecting prism PR1 is located at a predetermined position (prism reference position).
  • a predetermined position prism reference position
  • the objective optical system Preferably, it is located on the optical axis Z11 of the system OBL1.
  • observation optical system LS1 satisfies the above conditional expression (A1).
  • conditional expression (A1) it is possible to obtain a sufficient image blur correction angle for the rotation angle of the erecting prism PR1, and a good image can be observed during image blur correction. can do.
  • the observation optical system LS1 is an anti-vibration optical system having an anti-vibration function, and is used, for example, as an optical system for observation such as a telescope, binoculars, or a laser range finder.
  • a telescope optical system is configured by providing a single observation optical system LS1
  • a binocular optical system is configured by providing a pair of observation optical systems LS1 on the left and right (X-axis direction). be done.
  • the observation optical system LS1 includes, in order from the object side, an objective optical system OBL1, an erecting prism PR1, and an eyepiece optical system EPL1.
  • the subject light incident on the observation optical system LS1 passes through the objective optical system OBL1 and the erecting prism PR1, and forms a subject image (erecting image) as an intermediate image on the imaging plane IM.
  • the subject image formed on the imaging plane IM is magnified by the eyepiece optical system EPL1 and observed by an observer who places his eyes at the eyepoint EP.
  • the objective optical system OBL1 includes, in order from the object side, a first objective lens OL11 made of a cemented lens and having a positive refractive power, a second objective lens OL12 made of a single lens and having a positive refractive power, and a single lens. and a third objective lens OL13 having negative refractive power.
  • the erecting prism PR1 is composed of an auxiliary prism PR11 and a roof prism PR12 arranged with a predetermined gap (air interval) from the auxiliary prism PR11.
  • the auxiliary prism PR11 and the roof prism PR12 are arranged such that the front prism surface PR11a of the auxiliary prism PR11 and the rear prism surface PR12a of the roof prism PR12 are parallel to each other.
  • the light emitted from the objective optical system OBL enters the auxiliary prism PR11 from the front prism surface PR11a, is reflected multiple times within the auxiliary prism PR11, and then passes through the gap with the roof prism PR12. and enters the roof prism PR12.
  • the light that has entered the roof prism PR12 is reflected multiple times within the roof prism PR12, and then exits from the rear prism surface PR12a and heads toward the eyepiece optical system EPL1.
  • the erecting prism PR1 shown in FIG. 4 is different from its actual shape, and the gap between the auxiliary prism PR11 and the roof prism PR12 is also shown larger than it actually is.
  • the rotation center of the erecting prism PR1 is set as follows, for example.
  • FIG. 5 shows the erecting prism PR1 located at the reference position and seven rotation centers P0 to P6.
  • the rotation center P1 is located at the intersection of the front prism surface PR11a of the erecting prism PR1 and the optical axis Z11 of the objective optical system OBL1
  • the rotation center P5 is located at the rear prism surface PR12a of the erecting prism PR1.
  • the optical axis Z12 of the eyepiece optical system EPL1 is set as follows, for example.
  • FIG. 5 shows the erecting prism PR1 located at the reference position and seven rotation centers P0 to P6.
  • the rotation center P1 is located at the intersection of the front prism surface PR11a of the erecting prism PR1 and the optical axis Z11 of the objective optical system OBL1
  • the rotation center P5 is located at the rear prism surface PR12a of the erecting pris
  • the seven rotation centers P0 to P6 are the position of the rotation center P1 (the intersection of the front prism surface PR11a and the optical axis Z11) and the position of the rotation center P5 (the intersection of the rear prism surface PR12a and the optical axis Z12). position) on a virtual straight line (referred to as a "prism penetrating virtual straight line").
  • the rotation center P0 is located outside the erecting prism PR1 and between the front prism surface PR11a and the surface of the objective optical system OBL1 closest to the erecting prism PR1. Further, the rotation center P0 is a distance (L1 /4) away. Specifically, when a virtual plane perpendicular to the optical axis Z11 is set between the erecting prism PR1 and the objective optical system OBL1 at a distance of L1/4 from the position of the rotation center P1, the virtual plane The center of rotation P0 is located at the intersection of the virtual line passing through the prism and the virtual straight line passing through the prism.
  • the other four rotation centers P2, P3, P4, and P6 are located inside the erecting prism PR1.
  • the rotation center P2 is a distance (L1/4) from the position of the rotation center P1 (front prism surface PR11a) to the length L1 in the direction along the optical axis Z11 of the objective optical system OBL1 of the erecting prism PR1. ) located a distance away. Specifically, when a virtual plane perpendicular to the optical axis Z11 is set at a position L1/4 away from the rotation center P1 inside the erecting prism PR1, the virtual plane and the virtual straight line passing through the prism are The rotation center P2 is located at the intersection of .
  • the rotation center P4 is located at a distance of 3 ⁇ L1/2 from the position of the rotation center P1.
  • the rotation center P6 is located at a distance of L1/8 from the position of the rotation center P1.
  • the four rotation centers P0, P1, P2, and P6 out of the seven rotation centers P0 to P6 are located between the front prism surface PR11a of the erecting prism PR1 and the optical axis Z11 of the objective optical system OBL1, respectively. It is located within a distance range of one quarter or less of the length of the erecting prism PR1 in the direction along the optical axis Z11 of the objective optical system OBL1 from the position of the intersection. Note that the rotation center of the erecting prism PR1 does not have to be set on the virtual straight line passing through the prism.
  • the rotation center when setting the rotation center between the erecting prism PR1 and the objective optical system OBL1, the rotation center may be set on the optical axis Z11 of the objective optical system OBL1. Further, the length L1 may be the length between the position of the rotation center P1 and the position of the rotation center P5 on the virtual straight line passing through the prism.
  • the erecting prism PR1 rotate in all directions around the rotation center position.
  • the deflection in the pitch direction is important, so the erecting prism PR1 It may be configured to be rotatable only in the periphery.
  • the rotation axis in the yaw direction and the rotation axis in the pitch direction do not necessarily need to intersect at one point.
  • the eyepiece optical system EPL1 includes, in order from the object side, a first eyepiece EL11 made of a cemented lens and having a negative refractive power, a second eyepiece EL12 made of a cemented lens and having a positive refractive power, and a cemented lens.
  • the third eyepiece EL13 is made of a single lens and has a positive refractive power
  • the fourth eyepiece EL14 is made of a single lens and has a positive refractive power.
  • the erecting prism PR1 is rotated from the prism reference position around the rotation center position (for example, rotation center P1) (here, the X-axis passing through the rotation center position (the rotation angle is ⁇ ), and the image blur correction angle u is obtained.
  • the rotation angle ⁇ and the image blur correction angle u of the erecting prism PR1 have positive values when rotated clockwise in FIG. 49 and the like, and negative values when rotated counterclockwise.
  • the image blur correction angle u can be calculated as follows. The calculation procedure will be explained below with reference to FIGS. 50 to 54. As shown in FIGS. 50 and 51, the image blur correction angle with respect to the rotation angle of the erecting prism PR1 is calculated by tracing back the light ray from the eyepiece optical system EPL1 side.
  • FIG. 50 shows the coordinates of points A to D before rotation of the erecting prism PR1
  • FIG. 51 shows the coordinates of points E, G, and I after rotation of the erecting prism PR1.
  • Point A shown in FIG. 50 indicates a ray of light that is incident from the eyepiece optical system EPL1 side along its optical axis Z12 to the rear prism surface PR12a of the erecting prism PR1 located at the prism reference position ("reverse tracking before prism rotation”). This is the point of incidence (referred to as the "prism rotation anterior eye side entrance point") of the "incident ray", and its coordinates are (Za, Ya).
  • Point B is a point corresponding to the position of the corner of the roof prism PR12 before the prism rotation, and its coordinates are (Zb, Yb).
  • Point C is a ray of light ("before prism rotation” This is the exit point (referred to as the "object-side exit point before prism rotation") of the "reverse tracing exit ray", and its coordinates are (Zc, Yc).
  • Point D is a point corresponding to the position of the corner of the auxiliary prism PR11 before the prism rotation, and its coordinates are (Zd, Yd).
  • Point E shown in FIG. 51 indicates a ray incident from the eyepiece optical system EPL1 side along its optical axis Z12 to the rear prism surface PR12a of the erecting prism PR1 after rotation by the angle ⁇ ("reverse tracing after prism rotation").
  • the point of incidence (referred to as the "incoming ray") (referred to as the "eye-side entrance point after prism rotation"), and its coordinates are (Ze, Ye).
  • Point G is the ray that emerges from the front prism surface PR1 of the erecting prism PR1 when the back-traced incident ray after the prism rotation that entered the eye-side incident point (point E) after the prism rotation is further traced back.
  • Point I corresponds to the position of the intersection between the front prism surface PR11a of the auxiliary prism PR11 after the prism rotation and the optical axis Z11 of the objective optical system OBL1, and its coordinates are (Zi, Yi).
  • points and coordinates moved after the erecting prism PR1 rotates are marked with a dash (').
  • points A, B, C, and D move to points A', B', C', and D', respectively.
  • the coordinates (Za', Ya'), (Zb', Yb'), (Zc', Yc'), and (Zd', Yd') of each moved point are calculated by the following formulas (1) to (4), respectively. It can be found by
  • the distance dh3 (see FIG. 52) between the point A and the point B after the rotation of the erecting prism PR1 can be determined by the following equation (6).
  • the distance dh3' between the point E and the point B' after the rotation of the erecting prism PR1 can be determined by the following equation (7).
  • the amount of positional deviation ⁇ h (see FIG. 52) between the prism rotation anterior eye-side incidence point and the prism rotation post-eye side incidence point on the rear prism surface PR12a is calculated by the following formula. It can be obtained from (8).
  • FIG. 52 shows a developed view of the erecting prism PR1, which is considered to be a parallel flat plate.
  • a virtual line LN1 shown as a solid line in FIG. 52 is incident on the eye side incidence point (point E) after the prism rotation on the rear prism surface PR12a as a back-tracking incident ray after the prism rotation, and on the object side after the prism rotation on the front prism surface PR11a. It shows the optical path of the light ray that is emitted from the exit point (point G) as a back-tracing emitted light ray after the prism has rotated.
  • the light ray represented by the virtual line LN1 is refracted at the rear prism surface PR12a, the boundary between the roof prism PR12 and the auxiliary prism PR11, and the front prism surface PR11a.
  • the shift amount of the light beam at the roof prism PR12 is assumed to be ⁇ P1
  • the shift amount of the light beam at the auxiliary prism PR11 is assumed to be ⁇ P2.
  • the glass path lengths of the roof prism PR12 and the auxiliary prism PR11 are respectively d1 and d2
  • the refractive indices of the roof prism PR12 and the auxiliary prism PR11 are n1 and n2, respectively
  • the refraction angles of the roof prism PR12 and the auxiliary prism PR11 are ⁇ 1' and d2, respectively.
  • the glass path length dt of the entire erecting prism PR1 including the air gap (air gap) between the roof prism PR12 and the auxiliary prism PR12 is determined by the following equation (14). Furthermore, the amount of deviation ⁇ S (see FIG. 52) when the glass path length dt is tilted by ⁇ [°] is determined by the following equation (15).
  • the deviation amount ⁇ (see FIG. 52) of the light beam exit position on the front prism surface PR1 of the erecting prism PR1 before and after the rotation of the erecting prism PR1 is determined by the following equation (16).
  • the coordinate values Zg and Yg of point G are determined by the following equations (19) and (20), respectively.
  • the amount of deviation ⁇ Z in the Z-axis direction and ⁇ Y in the Y-axis direction between the object-side injection point (point C) before prism rotation and the object-side injection point (point G) after prism rotation of the erecting prism PR1 is calculated by the following formula (21). and (22), respectively.
  • FIG. 53 shows the distance dop between the final surface of the objective optical system OBL1 (the surface closest to the erecting prism PR1) and the front prism surface PR11a of the erecting prism PR1 before rotation.
  • FIG. 54 shows the back focus bf1 of the objective optical system OBL1.
  • the distance Zot (see FIG. 54) between the focal position F' of the objective optical system OBL1 and the object point Ot is determined by the following equation (24).
  • the lateral magnification ⁇ of the objective optical system OBL1 is determined by the following formula (25), and the angular magnification ⁇ is determined by the following formula (26).
  • the image blur correction angle u finally obtained is determined by changing the angle by twice the tilt angle ( ⁇ ) in the erecting prism PR1 with respect to the rotation angle ⁇ of the erecting prism PR1, and further increasing the angular magnification in the objective optical system OBL1. Since the angle changes depending on ⁇ , it is determined by the following equation (27).
  • FIGS. 1 to 10 and Table 1 show an observation optical system LS1 according to a first embodiment used in a telescope or binoculars.
  • the observation optical system LS1 includes, in order from the object side, an objective optical system OBL1, an erecting prism PR1 for erecting an image formed by the objective optical system OBL1, and an objective optical system OBL1. It has an eyepiece optical system EPL1 for observing the formed image, and corrects the image by rotating the erecting prism PR1 from a predetermined position (prism reference position).
  • the center of rotation for rotating the erecting prism PR1 is the surface of the erecting prism PR1 closest to the objective optical system OBL1 (front prism surface PR11a) and the light of the objective optical system OBL1 when the erecting prism PR1 is located at a predetermined position.
  • the center of rotation P0 is located at a distance of one quarter of the length of the objective optical system OBL1 of the erecting prism PR1 in the direction along the optical axis Z11 from the point of intersection with the axis Z11 (see FIG. 5). ) located in
  • the rotation center P0 is the surface of the erecting prism PR1 closest to the objective optical system OBL1 (front prism surface PR11a) and the objective optical system OBL1 when the erecting prism PR1 is located at a predetermined position (prism reference position). It is located between the surface closest to the erecting prism PR1. Furthermore, the rotation center P0 is the intersection position of the front prism surface PR11a of the erecting prism PR1 and the optical axis Z11 of the objective optical system OBL1, and the intersection position of the rear prism surface PR12a and the optical axis Z12 of the eyepiece optical system EPL1. It is located on a virtual straight line passing through the prism (virtual straight line passing through the prism).
  • the objective optical system OBL1 includes, in order from the object side, a first objective lens OL11 made of a cemented lens and having a positive refractive power, and a second objective lens OL11 made of a single lens and having a positive refractive power. It is composed of an objective lens OL12 and a third objective lens OL13 made of a single lens and having negative refractive power.
  • the first objective lens OL11 is a cemented lens of a negative meniscus lens with a convex surface facing the object side and a biconvex lens.
  • the second objective lens OL12 is a positive meniscus lens with a convex surface facing the object side
  • the third objective lens OL13 is a negative meniscus lens with a convex surface facing the object side.
  • the observation optical system LS1 emits the parallel light beam that has entered the objective optical system OBL1 from the object side as a parallel light beam toward the eyepoint EP via the erecting prism PR1 and the eyepiece optical system EPL1. It is afocal type.
  • the object light incident on the observation optical system LS1 passes through the objective optical system OBL1 and the erecting prism PR1, and forms an erect object image as an intermediate image on the imaging plane IM.
  • the subject image formed on the imaging plane IM is magnified by the eyepiece optical system EPL1 and observed by an observer who places his eyes at the eyepoint EP.
  • the erecting prism PR1 is composed of an auxiliary prism PR11 and a roof prism PR12 arranged with a predetermined gap (air interval) from the auxiliary prism PR11.
  • the auxiliary prism PR11 and the roof prism PR12 are arranged such that the front prism surface PR11a of the auxiliary prism PR11 and the rear prism surface PR12a of the roof prism PR12 are parallel to each other.
  • the light emitted from the objective optical system OBL1 enters the auxiliary prism PR11 from the front prism surface PR11a, is reflected multiple times within the auxiliary prism PR11, and then passes through the gap with the roof prism PR12. and enters the roof prism PR12.
  • the light that has entered the roof prism PR12 is reflected multiple times within the roof prism PR12, and then exits from the rear prism surface PR12a and heads toward the eyepiece optical system EPL1.
  • the eyepiece optical system EPL1 includes, in order from the object side, a first eyepiece EL11 made of a cemented lens and having a negative refractive power, a second eyepiece EL12 made of a cemented lens and having a positive refractive power, and a cemented lens.
  • the third eyepiece EL13 is made of a single lens and has a positive refractive power
  • the fourth eyepiece EL14 is made of a single lens and has a positive refractive power.
  • the first eyepiece lens EL11 is a cemented lens of a biconcave lens and a positive meniscus lens with a convex surface facing the object side.
  • the second eyepiece lens EL12 is a cemented lens of a biconcave lens and a biconvex lens.
  • the third eyepiece EL13 is a cemented lens of a biconvex lens and a negative meniscus lens with a concave surface facing the object side.
  • the fourth eyepiece EL14 is a positive meniscus lens with a convex surface facing the object side.
  • Tables 1 to 14 are shown below, which list the values of the specifications of the observation optical systems according to the first to eighth examples and the first to sixth reference examples, respectively.
  • the prism rotation angle is the rotation angle of the erecting prism required to obtain an image blur correction angle of 1.5°. The smaller this value is, the larger the image blur correction angle can be obtained with a smaller prism rotation angle.
  • the angular magnification ⁇ is the angular magnification of the objective optical system, and the larger the value, the larger the image blur correction angle can be obtained.
  • is the eye of the principal ray from an object point at infinity at the center of the field of view when the erecting prism is rotated around the rotation center to obtain an image stabilization angle of 1.5°.
  • the surface number is the number of each lens surface (including prism surfaces and virtual surfaces) counted from the object side
  • R is the radius of curvature of each lens surface
  • D is the distance between each lens surface
  • mm is generally used for the radius of curvature R, surface spacing D, and other lengths listed in all the specification values below, but the optical system can be expanded or reduced proportionally. Since equivalent optical performance can be obtained, it is not limited to this. Furthermore, the same symbols as in this example are used in the specification values of the second to eighth embodiments and the first to sixth reference examples, which will be described later.
  • Table 1 below shows each specification in the first example. Note that the radius of curvature R of the first to 24th surfaces in Table 1 corresponds to the symbols R1 to R24 assigned to the first to 24th surfaces in FIG. Further, the 15th surface is a virtual surface corresponding to the imaging plane IM on which an intermediate image (subject image) is formed, and the 24th surface is a virtual surface corresponding to the eyepoint EP. Further, the distance between the 23rd surface and the 24th surface is the distance (eye relief) from the final lens surface (23rd surface) to the eye point EP.
  • FIG. 6 shows various aberrations (spherical aberration, astigmatism, and distortion aberration) when the erecting prism is not rotated (when the image blur correction angle is 0.0°) in the observation optical system according to the first example. It is a diagram.
  • FIG. 7 is a diagram showing the lateral aberration when the erecting prism is not rotated (when the image blur correction angle is 0.0°) in the observation optical system according to the first example.
  • FIG. 8 shows the results when the erecting prism is rotated around the rotation center P0 (when the prism rotation angle is 1.82°) in order to obtain an image blur correction angle of 1.5° in the observation optical system according to the first embodiment. It is a figure showing transverse aberration.
  • g is g.
  • the vertical axis indicates a value normalized with the maximum value of the entrance pupil radius as 1, and the horizontal axis indicates the aberration in each ray in dioptres.
  • a solid line indicates a sagittal surface for each wavelength, and a broken line indicates a meridional surface for each wavelength.
  • the vertical axis indicates the angle of view [°]
  • the horizontal axis indicates the aberration in each light ray in dioptres.
  • the vertical axis indicates the angle of view [°]
  • the horizontal axis indicates the aberration ratio in percentage (% value).
  • Each lateral aberration diagram is displayed when the image height ratio RFH (Relative Field Height) is 1.00, 0.70, 0.50, 0.00, or 1.00, 0.70, 0.50, 0.00. , -0.50, -0.70, -1.00 (unit: ['] (minute)).
  • FIG. 9 is a diagram showing a spot diagram when the erecting prism is not rotated (when the image blur correction angle is 0.0°) in the observation optical system according to the first example.
  • FIG. 10 shows the results when the erecting prism is rotated around the rotation center P0 (when the prism rotation angle is 1.82°) in order to obtain an image blur correction angle of 1.5° in the observation optical system according to the first embodiment.
  • It is a figure which shows a spot diagram.
  • Each spot diagram shows how much the rays of each wavelength of d-line, C-line, F-line, and g-line are angularly shifted from the principal ray at the eyepoint position (unit: ['] (minutes)).
  • Each spot diagram also shows a value ['] calculated by the root mean square (RMS) of the degree of variation in angular deviation. This point is the same for each spot diagram shown below, and duplicate explanation will be omitted.
  • RMS root mean square
  • the spot diagram shown in Figure 10 shows that the RMS value when the erecting prism is rotated around the rotation center P0 is suppressed to 12.3 ['], and in this respect as well, it has excellent optical performance. I understand that. As a result, excellent optical performance can be ensured even in telescopes and binoculars by installing the observation optical system of the first embodiment.
  • FIGS. 1 to 5 showing the observation optical system LS1 according to the first embodiment will be used to explain the observation optical system according to the second embodiment, and [lens data] will be omitted in Table 2.
  • the rotation center P1 is located at the intersection of the front prism surface PR11a of the erecting prism PR1 and the optical axis Z11 of the objective optical system OBL1.
  • FIG. 11 shows the result when the erecting prism is rotated around the rotation center P1 (when the prism rotation angle is 2.05°) in order to obtain an image blur correction angle of 1.5° in the observation optical system according to the second embodiment. It is a figure showing transverse aberration.
  • FIG. 12 shows the result when the erecting prism is rotated around the rotation center P1 in order to obtain an image blur correction angle of 1.5° in the observation optical system according to the second embodiment (when the prism rotation angle is 2.05°). It is a figure which shows a spot diagram.
  • FIGS. 1 to 5 showing the observation optical system LS1 according to the first embodiment will be used to explain the observation optical system according to the third embodiment, and [lens data] will be omitted in Table 3. As shown in FIG.
  • the center of rotation P6 is located on the virtual straight line penetrating the prism in the erecting prism PR1, from the intersection position of the front prism surface PR11a of the erecting prism PR1 and the optical axis Z11 of the objective optical system OBL1 to L1/ Located at a distance of 8.
  • FIG. 13 shows the result when the erecting prism is rotated around the rotation center P6 (when the prism rotation angle is 2.19°) in order to obtain an image blur correction angle of 1.5° in the observation optical system according to the third embodiment. It is a figure showing transverse aberration.
  • FIG. 14 shows the results when the erecting prism is rotated around the rotation center P6 (when the prism rotation angle is 2.19°) in order to obtain an image blur correction angle of 1.5° in the observation optical system according to the third embodiment. It is a figure which shows a spot diagram.
  • FIGS. 1 to 5 showing the observation optical system LS1 according to the first embodiment will be used to explain the observation optical system according to the fourth embodiment, and [lens data] will be omitted in Table 4. As shown in FIG.
  • the center of rotation P2 is located on the virtual straight line penetrating the prism in the erecting prism PR1, from the intersection position of the front prism surface PR11a of the erecting prism PR1 and the optical axis Z11 of the objective optical system OBL1 to L1/ Located at a distance of 4.
  • FIG. 15 shows the results when the erecting prism is rotated around the rotation center P2 (when the prism rotation angle is 2.35°) in order to obtain an image blur correction angle of 1.5° in the observation optical system according to the fourth embodiment. It is a figure showing transverse aberration.
  • FIG. 16 shows the results when the erecting prism is rotated around the rotation center P2 (when the prism rotation angle is 2.35°) in order to obtain an image blur correction angle of 1.5° in the observation optical system according to the fourth embodiment. It is a figure which shows a spot diagram.
  • FIGS. 17 and 18 show an observation optical system LS2 according to a fifth embodiment used in a telescope or binoculars.
  • the observation optical system LS2 includes, in order from the object side, an objective optical system OBL2, an erecting prism PR2 for erecting an image formed by the objective optical system OBL2, and an objective optical system OBL2. It has an eyepiece optical system EPL2 for observing the formed image, and corrects the image by rotating the erecting prism PR2 from a predetermined position (prism reference position).
  • the center of rotation for rotating the erecting prism PR2 is the surface of the erecting prism PR2 closest to the objective optical system OBL2 (front prism surface PR21a) and the light of the objective optical system OBL2 when the erecting prism PR2 is located at a predetermined position.
  • the center of rotation Q0 is located at a distance of one quarter of the length of the objective optical system OBL2 of the erecting prism PR2 in the direction along the optical axis Z21 from the position of the intersection with the axis Z21 (see FIG. 19). ) located in
  • the rotation center Q0 is the surface of the erecting prism PR2 closest to the objective optical system OBL2 (front prism surface PR21a) and the objective optical system OBL2 when the erecting prism PR2 is located at a predetermined position (prism reference position). It is located between the surface closest to the erecting prism PR2. Furthermore, the rotation center Q0 is the intersection position of the front prism surface PR21a of the erecting prism PR2 and the optical axis Z21 of the objective optical system OBL2, and the intersection position of the rear prism surface PR22a and the optical axis Z22 of the eyepiece optical system EPL2. It is located on a virtual straight line passing through the prism (virtual straight line passing through the prism).
  • the objective optical system OBL2 includes, in order from the object side, a first objective lens OL21 made of a cemented lens and having a positive refractive power, and a second objective lens OL21 made of a single lens and having a positive refractive power. It is composed of an objective lens OL22 and a second objective lens OL23 made of a single lens and having positive refractive power.
  • the first objective lens OL21 is a cemented lens of a negative meniscus lens with a convex surface facing the object side and a biconvex lens.
  • the second objective lens OL22 is a positive meniscus lens with a convex surface facing the object side
  • the third objective lens OL23 is a negative meniscus lens with a convex surface facing the object side.
  • the observation optical system LS2 is an afocal system that emits the parallel light beam that has entered the objective optical system OBL2 from the object side as a parallel light beam toward the eyepoint EP via the erecting prism PR2 and the eyepiece optical system EPL2. .
  • the object light incident on the observation optical system LS1 passes through the objective optical system OBL2 and the erecting prism PR2, and forms an erect object image as an intermediate image on the imaging plane IM.
  • the subject image formed on the imaging plane IM is magnified by the eyepiece optical system EPL2 and observed by an observer who places his eyes at the eyepoint EP.
  • the erecting prism PR2 is composed of an auxiliary prism PR21 and a roof prism PR22 arranged with a predetermined gap (air interval) from the auxiliary prism PR21.
  • the auxiliary prism PR21 and the roof prism PR22 are arranged such that the front prism surface PR21a of the auxiliary prism PR21 and the rear prism surface PR22a of the roof prism PR22 are parallel to each other.
  • the light emitted from the objective optical system OBL2 enters the auxiliary prism PR21 from the front prism surface PR21a, is reflected multiple times within the auxiliary prism PR21, and then enters the roof prism PR22 through the gap with the roof prism PR22. .
  • the light that has entered the roof prism PR22 is reflected multiple times within the roof prism PR22, and then exits from the rear prism surface PR22a and heads toward the eyepiece optical system EPL2.
  • the rotation center of the erecting prism PR2 is set as follows, for example.
  • FIG. 19 shows the erecting prism PR2 located at the reference position and seven rotation centers Q0 to Q6.
  • the rotation center Q1 is located at the intersection of the front prism surface PR21a of the erecting prism PR2 and the optical axis Z21 of the objective optical system OBL2, and the rotation center Q5 is located at the rear prism surface PR22a of the erecting prism PR2. and the optical axis Z22 of the eyepiece optical system EPL2.
  • the seven rotation centers Q0 to Q6 are the position of the rotation center Q1 (the intersection of the front prism surface PR21a and the optical axis Z21) and the position of the rotation center Q5 (the intersection of the rear prism surface PR22a and the optical axis Z22). position) on a virtual straight line (virtual straight line passing through the prism).
  • the rotation center Q0 is located outside the erecting prism PR2 and between the front prism surface PR21a and the surface of the objective optical system OBL2 closest to the objective optical system OBL2. Moreover, the rotation center Q0 is a distance (L2 /4) away. Specifically, when a virtual plane perpendicular to the optical axis Z21 is set between the erecting prism PR2 and the objective optical system OBL2 at a distance of L2/4 from the position of the rotation center Q1, the virtual plane The center of rotation Q0 is located at the intersection of the virtual straight line passing through the prism.
  • the other four rotation centers Q2, Q3, Q4, and Q6 are located inside the erecting prism PR2.
  • the rotation center Q2 is a distance (L2/4) from the position of the rotation center Q1 (front prism surface PR21a) to a quarter of the length L2 in the direction along the optical axis Z21 of the objective optical system OBL2 of the erecting prism PR2. ) located a distance away. Specifically, when a virtual plane perpendicular to the optical axis Z21 is set at a position L2/4 away from the rotation center Q1 inside the erecting prism PR2, the virtual plane and the virtual straight line passing through the prism are The rotation center Q2 is located at the intersection of .
  • the rotation center Q4 is located at a distance of 3 x L2/4 from the position of the rotation center Q1.
  • the rotation center Q6 is located at a distance of L2/8 from the position of the rotation center P1.
  • the four rotation centers Q0, Q1, Q2, and Q6 out of the seven rotation centers Q0 to Q6 are located between the front prism surface PR21a of the erecting prism PR2 and the optical axis Z21 of the objective optical system OBL2, respectively. It is located within a distance range of one quarter or less of the length of the erecting prism PR2 in the direction along the optical axis Z21 of the objective optical system OBL2 from the position of the intersection.
  • the eyepiece optical system EPL2 includes, in order from the object side, a first eyepiece EL21 made of a single lens and having a negative refractive power, a second eyepiece EL22 made of a single lens and having a positive refractive power, and a cemented lens.
  • the third eyepiece EL23 is made of a single lens and has a positive refractive power
  • the fourth eyepiece EL24 is made of a single lens and has a positive refractive power.
  • the first eyepiece EL21 is a biconcave lens
  • the second eyepiece EL22 is a positive meniscus lens with a concave surface facing the object side.
  • the third eyepiece EL23 is a cemented lens of a biconcave lens and a biconvex lens
  • the fourth eyepiece EL24 is a positive meniscus lens with a convex surface facing the object side.
  • Table 5 below shows each specification in the fifth example.
  • the radius of curvature R of the first to 22nd surfaces in Table 5 corresponds to the symbols R1 to R22 assigned to the first to 22nd surfaces in FIG.
  • the 14th surface is a virtual surface corresponding to the imaging plane IM on which an intermediate image (subject image) is formed
  • the 22nd surface is a virtual surface corresponding to the eyepoint EP.
  • the distance between the 21st surface and the 22nd surface is the distance (eye relief) from the final lens surface (21st surface) to the eye point EP.
  • FIG. 20 shows various aberrations (spherical aberration, astigmatism, and distortion aberration) when the erecting prism is not rotated (when the image blur correction angle is 0.0°) in the observation optical system according to the fifth example. It is a diagram.
  • FIG. 21 is a diagram showing lateral aberration when the erecting prism is not rotated (when the image blur correction angle is 0.0°) in the observation optical system according to the fifth example.
  • FIG. 22 shows the result when the erecting prism is rotated around the rotation center Q0 (when the prism rotation angle is 1.52°) in order to obtain an image blur correction angle of 1.5° in the observation optical system according to the fifth embodiment. It is a figure showing transverse aberration.
  • FIG. 23 is a diagram showing a spot diagram when the erecting prism is not rotated (when the image blur correction angle is 0.0°) in the observation optical system according to the fifth example.
  • FIG. 24 shows the results when the erecting prism is rotated around the rotation center Q0 (when the prism rotation angle is 1.52°) in order to obtain an image blur correction angle of 1.5° in the observation optical system according to the fifth embodiment. It is a figure which shows a spot diagram.
  • the spot diagram shown in Figure 24 shows that the RMS value when the erecting prism is rotated around the rotation center Q0 is suppressed to 10.9['], and in this respect as well, it has excellent optical performance. I understand that. As a result, by installing the observation optical system of the fifth embodiment, excellent optical performance can be ensured even in telescopes and binoculars.
  • the observation optical system according to the sixth example has the same lens configuration and prism configuration as the observation optical system LS2 according to the fifth example, and the difference from the fifth example is that the rotation center of the erecting prism is Q1.
  • FIGS. 17 to 19 showing the observation optical system LS2 according to the fifth embodiment will be used to explain the observation optical system according to the sixth embodiment, and [lens data] will be omitted in Table 6.
  • the rotation center Q1 is located at the intersection of the front prism surface PR21a of the erecting prism PR2 and the optical axis Z21 of the objective optical system OBL1.
  • FIG. 25 shows the results when the erecting prism is rotated around the rotation center Q1 (when the prism rotation angle is 1.72°) in order to obtain an image blur correction angle of 1.5° in the observation optical system according to the sixth embodiment. It is a figure showing transverse aberration.
  • FIG. 26 shows the results when the erecting prism is rotated around the rotation center Q1 (when the prism rotation angle is 1.72°) in order to obtain an image blur correction angle of 1.5° in the observation optical system according to the sixth embodiment. It is a figure which shows a spot diagram.
  • FIGS. 17 to 19 showing the observation optical system LS2 according to the fifth embodiment will be used to explain the observation optical system according to the seventh embodiment, and [lens data] will be omitted in Table 7. As shown in FIG.
  • the center of rotation Q6 is located on the virtual straight line penetrating the prism in the erecting prism PR2, from the intersection position of the front prism surface PR21a of the erecting prism PR2 and the optical axis Z21 of the objective optical system OBL2 to L2/ Located at a distance of 8.
  • FIG. 27 shows the result when the erecting prism is rotated around the rotation center Q6 (when the prism rotation angle is 1.84°) in order to obtain an image blur correction angle of 1.5° in the observation optical system according to the seventh embodiment. It is a figure showing transverse aberration.
  • FIG. 28 shows the result when the erecting prism is rotated around the rotation center Q6 (when the prism rotation angle is 1.84°) in order to obtain an image blur correction angle of 1.5° in the observation optical system according to the seventh embodiment. It is a figure which shows a spot diagram.
  • FIGS. 17 to 19 showing the observation optical system LS2 according to the fifth embodiment will be used to explain the observation optical system according to the eighth embodiment, and [lens data] will be omitted in Table 8. As shown in FIG.
  • the center of rotation Q2 is located at L2/ from the intersection position of the front prism surface PR21a of the erecting prism PR2 and the optical axis Z21 of the objective optical system OBL2 on the virtual straight line penetrating the erecting prism PR2. Located at a distance of 4.
  • FIG. 29 shows the result when the erecting prism is rotated around the rotation center Q2 (when the prism rotation angle is 1.97°) in order to obtain an image blur correction angle of 1.5° in the observation optical system according to the eighth embodiment. It is a figure showing transverse aberration.
  • FIG. 30 shows the result when the erecting prism is rotated around the rotation center Q2 (when the prism rotation angle is 1.97°) in order to obtain an image blur correction angle of 1.5° in the observation optical system according to the eighth embodiment. It is a figure which shows a spot diagram.
  • FIGS. 1 to 5 showing the observation optical system LS1 according to the first embodiment will be used to explain the observation optical system according to the first reference example, and [lens data] will be omitted in Table 9. As shown in FIG.
  • the rotation center P3 is located on the virtual straight line passing through the prism in the erecting prism PR1, from the intersection position of the front prism surface PR11a of the erecting prism PR1 and the optical axis Z11 of the objective optical system OBL1 to L1/ Located at a distance of 2.
  • FIG. 31 shows the observation optical system according to the first reference example when the erecting prism is rotated around the rotation center P3 to obtain an image blur correction angle of 1.5° (when the prism rotation angle is 2.75°). It is a figure showing transverse aberration.
  • FIG. 32 shows the observation optical system according to the first reference example when the erecting prism is rotated around the rotation center P3 to obtain an image blur correction angle of 1.5° (when the prism rotation angle is 2.75°). It is a figure which shows a spot diagram.
  • when the erecting prism is rotated around the rotation center P3 is as large as 3.2 ['], compared to the first to fourth embodiments. It can be seen that the color separation is large and the optical performance is inferior.
  • FIGS. 1 to 5 showing the observation optical system LS1 according to the first embodiment will be used to explain the observation optical system according to the second reference example, and [lens data] will be omitted in Table 10. As shown in FIG.
  • the rotation center P4 is 3 ⁇ from the intersection position of the front prism surface PR11a of the erecting prism PR1 and the optical axis Z11 of the objective optical system OBL1 on the virtual straight line penetrating the erecting prism PR1. It is located at a distance of L1/4.
  • FIG. 33 shows the observation optical system according to the second reference example when the erecting prism is rotated around the rotation center P4 to obtain an image blur correction angle of 1.5° (when the prism rotation angle is 3.32°). It is a figure showing transverse aberration.
  • FIG. 34 shows the observation optical system according to the second reference example when the erecting prism is rotated around the rotation center P4 to obtain an image blur correction angle of 1.5° (when the prism rotation angle is 3.32°). It is a figure which shows a spot diagram.
  • when the erecting prism is rotated around the rotation center P4 is as large as 4.3['], compared to the first to fourth embodiments. It can be seen that the color separation is large and the optical performance is inferior.
  • FIGS. 1 to 5 showing the observation optical system LS1 according to the first embodiment will be used to explain the observation optical system according to the third reference example, and [lens data] will be omitted in Table 11.
  • the rotation center P5 is located at the intersection of the rear prism surface PR12a of the erecting prism PR1 and the optical axis Z12 of the eyepiece optical system EPL1.
  • FIG. 35 shows the observation optical system according to the third reference example when the erecting prism is rotated at the rotation center P5 to obtain an image blur correction angle of 1.5° (when the prism rotation angle is 4.19°). It is a figure showing transverse aberration.
  • FIG. 36 shows the observation optical system according to the third reference example when the erecting prism is rotated at the rotation center P5 to obtain an image blur correction angle of 1.5° (when the prism rotation angle is 4.19°). It is a figure which shows a spot diagram.
  • when the erecting prism is rotated around the rotation center P5 is as large as 5.9['], compared to the first to fourth embodiments. It can be seen that the color separation is large and the optical performance is inferior.
  • FIGS. 17 to 19 showing the observation optical system LS2 according to the fifth embodiment will be used to explain the observation optical system according to the fourth reference example, and [lens data] will be omitted in Table 12. As shown in FIG.
  • the center of rotation Q3 is located on the virtual straight line penetrating the prism in the erecting prism PR2, from the intersection position of the front prism surface PR21a of the erecting prism PR2 and the optical axis Z21 of the objective optical system OBL2 to L2/ Located at a distance of 2.
  • FIG. 37 shows the observation optical system according to the fourth reference example when the erecting prism is rotated around the rotation center Q3 to obtain an image blur correction angle of 1.5° (when the prism rotation angle is 2.32°). It is a figure showing transverse aberration.
  • FIG. 36 shows the result when the erecting prism is rotated around the rotation center Q3 (when the prism rotation angle is 2.32°) in order to obtain an image blur correction angle of 1.5° in the observation optical system according to the fourth reference example. It is a figure which shows a spot diagram.
  • when the erecting prism is rotated around the rotation center Q3 is as large as 3.4 ['], compared to the fifth to eighth embodiments. It can be seen that the color separation is large and the optical performance is inferior.
  • the observation optical system according to the fifth reference example has the same lens configuration and prism configuration as the observation optical system LS2 according to the fifth example, and the difference from the fifth example is that the rotation center of the erecting prism is Q4. The only point is that. Therefore, FIGS. 17 to 19 showing the observation optical system LS2 according to the fifth embodiment will be used to explain the observation optical system according to the fifth reference example, and [lens data] will be omitted in Table 13. As shown in FIG.
  • the rotation center Q4 is 3 ⁇ from the intersection position of the front prism surface PR21a of the erecting prism PR2 and the optical axis Z21 of the objective optical system OBL2 on the virtual straight line passing through the prism in the erecting prism PR2. It is located at a distance of L2/4.
  • FIG. 39 shows the observation optical system according to the fifth reference example when the erecting prism is rotated around the rotation center Q4 to obtain an image blur correction angle of 1.5° (when the prism rotation angle is 2.82°). It is a figure showing transverse aberration.
  • FIG. 40 shows the result when the erecting prism is rotated around the rotation center Q4 (when the prism rotation angle is 2.82°) in order to obtain an image blur correction angle of 1.5° in the observation optical system according to the fifth reference example. It is a figure which shows a spot diagram.
  • when the erecting prism is rotated around the rotation center Q4 is as large as 4.4['], compared to the fifth to eighth embodiments. It can be seen that the color separation is large and the optical performance is inferior.
  • FIGS. 17 to 19 showing the observation optical system LS2 according to the fifth embodiment will be used to explain the observation optical system according to the fifth reference example, and [lens data] will be omitted in Table 14.
  • the rotation center Q5 is located at the intersection of the rear prism surface PR22a of the erecting prism PR2 and the optical axis Z22 of the eyepiece optical system EPL2.
  • FIG. 41 shows the observation optical system according to the sixth reference example when the erecting prism is rotated at the rotation center Q5 to obtain an image blur correction angle of 1.5° (when the prism rotation angle is 3.58°). It is a figure showing transverse aberration.
  • FIG. 42 shows the observation optical system according to the sixth reference example when the erecting prism is rotated at the rotation center Q5 to obtain an image blur correction angle of 1.5° (when the prism rotation angle is 3.58°). It is a figure which shows a spot diagram.
  • when the erecting prism is rotated around the rotation center Q5 is as large as 6.1['], compared to the fifth to eighth embodiments. It can be seen that the color separation is large and the optical performance is inferior.
  • FIG. 43 shows the prism rotation center, the prism rotation angle necessary to obtain an image blur correction angle of 1.5°, the angular magnification, and the prism rotation time in the first to fourth embodiments and the first to third reference examples.
  • is collectively shown.
  • FIG. 44 is a graph showing the relationship between the image blur correction angle and the prism rotation angle for each rotation center P0 to P6.
  • FIG. 45 is a graph of the angular deviation
  • the prism rotation angle required to obtain an image blur correction angle of 1.5° is smaller in the first to fourth embodiments, and The magnification ⁇ is large. Therefore, it can be seen that a larger image blur correction angle can be obtained with a smaller prism rotation angle in the first to fourth embodiments than in the first to third reference examples.
  • is smaller in the first to fourth embodiments than in the first to third reference examples. Therefore, it can be seen that the color separation is smaller in the first to fourth examples than in the first to third reference examples, and the image appearance during image blur correction is better.
  • P0, P1, P6, and P2 in the graphs of FIGS. 44 and 45 are, as shown in FIG. It is a rotation center located within a distance range of one quarter or less of the length L1 of the objective optical system OBL1 of the vertical prism PR1 in the direction along the optical axis Z11.
  • P3, P4, and P5 are rotation centers located within a range whose distance from the intersection point exceeds one-fourth of the length L1. It can be seen from FIG. 44 that a larger image blur correction angle can be obtained with a smaller prism rotation angle at the rotation centers P0, P1, P6, and P2 than at the rotation centers P3, P4, and P5. Also, from FIG.
  • the rotation center P0 is located outside the erecting prism PR1 and between the erecting prism PR1 and the objective optical system OBL1. Even at the rotation center P0, a large image blur correction angle can be obtained with a small prism rotation angle, and the value of angular deviation
  • FIG. 46 shows the prism rotation center, the prism rotation angle necessary to obtain an image blur correction angle of 1.5°, the angular magnification, and the prism rotation time in the fifth to eighth embodiments and the fourth to sixth reference examples.
  • is collectively shown.
  • FIG. 47 is a graph showing the relationship between the image blur correction angle and the prism rotation angle for each rotation center Q0 to Q6.
  • FIG. 48 is a graph of the angular deviation
  • the prism rotation angle required to obtain an image blur correction angle of 1.5° is smaller in the fifth to eighth embodiments, and The magnification ⁇ is large. Therefore, it can be seen that a larger image blur correction angle can be obtained with a smaller prism rotation angle in the fifth to eighth embodiments than in the fourth to sixth reference examples.
  • is smaller in the fifth to eighth embodiments than in the fourth to sixth reference examples. Therefore, it can be seen that the color separation is smaller in the fifth to eighth examples than in the fourth to sixth reference examples, and the image appearance during image blur correction is better.
  • Q0, Q1, Q6, and Q2 in the graphs of FIGS. 47 and 48 are, as shown in FIG. It is a rotation center located within a distance range of one quarter or less of the length L2 of the objective optical system OBL2 of the vertical prism PR2 in the direction along the optical axis Z21.
  • Q3, Q4, and Q5 are rotation centers located within a range whose distance from the intersection point exceeds one-fourth of the length L2. It can be seen from FIG. 47 that a larger image blur correction angle can be obtained with a smaller prism rotation angle at rotation centers Q0, Q1, Q6, and Q2 than at rotation centers Q3, Q4, and Q5. Also, from FIG.
  • the rotation center Q0 is located outside the erecting prism PR2 and between the erecting prism PR2 and the objective optical system OBL2. Even when the rotation center is Q0, a large image blur correction angle can be obtained with a small prism rotation angle, and the value of angular deviation
  • the rotation center is set between the erecting prism PR2 and the objective optical system OBL2, the farther the rotation center is from the erecting prism PR2, the more the erecting prism PR2 changes when the erecting prism PR2 rotates. The amount of movement increases. From the above, it is preferable that the center of rotation of the erecting prism PR2 is located within a distance range from the intersection point that is one quarter or less of the length L2.
  • conditional expression (A1) 0.25 ⁇ 0.50
  • a zoom lens variable magnification optical system
  • an eyepiece zoom optical system may be provided in place of the above-mentioned eyepiece optical system.

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119960167A (zh) * 2025-03-20 2025-05-09 中国科学院长春光学精密机械与物理研究所 一种基于旋转里斯利棱镜的扫描式光学系统

Citations (3)

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Publication number Priority date Publication date Assignee Title
JPS5423554A (en) * 1977-07-22 1979-02-22 Fuji Photo Optical Co Ltd Image stabilizing optical device
JP2015143728A (ja) * 2014-01-31 2015-08-06 鎌倉光機株式会社 像安定化装置
US20160011433A1 (en) * 2012-01-13 2016-01-14 Carl Zeiss Sports Optics Gmbh Optical system for imaging an object

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5423554A (en) * 1977-07-22 1979-02-22 Fuji Photo Optical Co Ltd Image stabilizing optical device
US20160011433A1 (en) * 2012-01-13 2016-01-14 Carl Zeiss Sports Optics Gmbh Optical system for imaging an object
JP2015143728A (ja) * 2014-01-31 2015-08-06 鎌倉光機株式会社 像安定化装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119960167A (zh) * 2025-03-20 2025-05-09 中国科学院长春光学精密机械与物理研究所 一种基于旋转里斯利棱镜的扫描式光学系统

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