JP2007233130A - Imaging optical system, lens barrel and imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imaging apparatus capable of obtaining a satisfactory image by obtaining an imaging optical system and a lens barrel, which are designed such that image forming performance is further improved by reducing the comatic aberration of a peripheral image at a focal distance, especially, on the wide-angle side. <P>SOLUTION: In the imaging optical system and lens barrel, a diaphragm member is located in the crossing position nearer to the diaphragm that defines an F number than any other crossing positions. This crossing position is the one selected from a group of crossing positions where the outermost light of a luminous flux forming an image on the optical axis of the imaging optical system crosses the outermost light of a luminous flux forming the largest, highest image of the imaging optical system when the imaging optical system is in a wide angle state. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an image pickup optical system configured to be variable in magnification, a lens barrel used in the image pickup optical system, and an image pickup apparatus including the lens barrel.

  Conventionally, a so-called zoom lens has been known in which the interval between the lens groups is changeable and the focal length can be changed.

In such a zoom lens, a diaphragm member (flare cutter) having a variable aperture diameter is provided in the lens barrel to cut off light rays (unnecessary light) that do not contribute to image formation and adversely affect the captured image at the intermediate focal length and telephoto side. And a device that changes the aperture diameter while moving in conjunction with the focus lens group (see, for example, Patent Document 1).
JP 2000-81556 A

  However, in the flare cutter device described in Patent Document 1 and the conventional diaphragm device for cutting unnecessary light, the unnecessary light is reflected by a portion other than the imaging surface, and the reflected light is imaged. This is for preventing the influence of contrast and the like, and does not improve the imaging performance itself of the imaging optical system.

  The present invention obtains an imaging optical system and a lens barrel that can reduce coma aberration of a peripheral image, particularly at a focal length on the wide angle side, and further improve imaging performance, and obtain an imaging device that can obtain a good image. It is intended.

  The above object is achieved by the invention described below.

  1. In an imaging optical system configured with a plurality of lens groups and configured to move and vary at least two lens groups among the plurality of lens groups, an aperture formed between the moving lens groups When the member is disposed and at least the imaging optical system is in the wide-angle state, the outermost light beam forming the image on the optical axis of the imaging optical system and the maximum image height position of the imaging optical system An imaging optical system, characterized in that the diaphragm member is positioned at an intersection position closer to the diaphragm defining the F number among positions where the outermost rays of the light beams forming the image intersect.

  2. The shape of the aperture of the aperture member is the outermost light beam forming the image on the optical axis of the imaging optical system and the most light beam forming the image at the maximum image height position of the imaging optical system. 2. The imaging optical system according to 1, wherein the imaging optical system is formed on the basis of the height in the direction perpendicular to the optical axis at the intersection position closer to the diaphragm defining the F number among the positions where the outer light rays intersect. .

  3. An imaging optical system configured with a plurality of lens groups and configured to move and vary at least two lens groups among the plurality of lens groups, and is movable between the lens groups, and an opening is formed. A diaphragm member and an image sensor that photoelectrically converts subject light from the imaging optical system, and at least when the imaging optical system is in a wide-angle state, forms an image of the center of the imaging surface of the image sensor Out of the positions where the outermost ray of the luminous flux intersects the outermost ray of the luminous flux forming the image at the highest image height on the imaging surface of the image sensor, it is close to the aperture that defines the F number The lens barrel is characterized in that the diaphragm member is moved to the crossing position.

  4). The shape of the aperture of the diaphragm member forms the outermost light beam forming the image at the center of the imaging surface of the image sensor and the image at the highest image height on the image sensor surface of the image sensor. 3 of the present invention, which is formed on the basis of the height in the direction perpendicular to the optical axis of the intersection position closer to the stop defining the F number among the positions where the outermost rays intersect. The lens barrel described.

  5. 5. The lens barrel according to claim 3, wherein at least two lens groups that are moved by zooming in the imaging optical system and the diaphragm member are moved by engaging with a cam barrel.

  6). 5. The lens barrel according to claim 3, wherein the diaphragm member is moved by being engaged with one lens group that is moved by zooming.

  7). The lens barrel according to any one of 3 to 6, wherein the lens barrel is configured to be retractable.

  An imaging apparatus comprising the lens barrel according to any one of 8.3 to 7.

  According to the present invention, imaging capable of reducing the coma aberration of the peripheral image at the focal length on the wide angle side and further improving the imaging performance of the peripheral portion without reducing the amount of light at the position where the image height is 100%. An optical system and a lens barrel can be obtained. Further, by providing the lens barrel, an imaging apparatus capable of obtaining a good image can be obtained.

  Hereinafter, the present invention will be described in detail with reference to embodiments, but the present invention is not limited thereto.

  FIG. 1 is an external view showing a camera which is an example of an imaging apparatus equipped with a lens barrel 80 according to the present invention. 1A is a perspective view of the front side of the camera, and FIG. 1B is a perspective view of the back side of the camera.

  In FIG. 1A, reference numeral 80 denotes a retractable lens barrel according to the present invention. 82 is a finder window, 83 is a release button, 84 is a flash light emitting unit, 86 is a microphone, 87 is a strap attaching unit, and 88 is a USB terminal. Reference numeral 89 denotes a lens cover, and the lens barrel 80 is retracted when not photographing.

  In FIG. 1B, 91 is a viewfinder eyepiece, 92 is a red and green display lamp, and displays AF and AE information to the photographer by light emission or blinking when the release button 83 is pressed. It is. A zoom button 93 is a button for zooming up and down. Reference numeral 94 denotes a speaker, which reproduces sound recorded by the microphone 86, emits a release sound, and the like. Reference numeral 95 denotes a menu / set button, reference numeral 96 denotes a selection button, which is a four-way switch, and reference numeral 100 denotes an image or other character information on the monitor LCD. The menu / set button 95 has a function of displaying various menus on the monitor LCD 100, selecting with the selection button 96, and confirming with the menu / set button 95. Reference numeral 97 denotes a reproduction button, which is a button for reproducing a photographed image. A display button 98 is a button for selecting display or deletion of an image or other character information displayed on the monitor LCD 100. An erasure button 99 is a button for erasing the recorded image. 101 is a tripod hole, and 102 is a battery / card cover. The battery / card cover 102 is loaded with a battery for supplying power to the camera and a card-type removable memory for recording captured images.

  First, the schematic configuration and operation of the lens barrel 80 according to the present invention will be described.

  FIG. 2 is a schematic longitudinal sectional view of the lens barrel 80 according to the present embodiment at the wide-angle end.

  In the figure, 1 is a first lens group, 2 is a second lens group, 3 is a third lens group, and the imaging optical system included in the lens barrel 80 in this example has a three-group configuration. When performing zooming, focusing is performed by moving the first lens group 1 and the second lens group 2 in the optical axis direction and moving the third lens group 3 in the optical axis direction. An optical filter 4 includes an OLPF (optical low-pass filter) that removes high-frequency components of subject light and an infrared light cut filter in order to prevent false color and moire. Reference numeral 5 denotes an image sensor that photoelectrically converts imaged subject light. For example, a CCD (Charge Coupled Device) type image sensor or a CMOS (Complementary Metal-Oxide Semiconductor) type image sensor is used.

  The first lens group 1 is held by a first lens group lens frame 6, the second lens group 2 is held by a second lens group lens frame 7, and the third lens group 3 is held by a third lens group lens frame 8. ing.

  Reference numeral 11 denotes a fixed barrel, which is integrally fixed to a camera body (not shown) and has a cam groove 11a on the inner periphery. A base plate 12 is fixed to the rear portion of the fixed drum 11. An optical filter 4 and an image sensor 5 are mounted on the ground plane 12. The image sensor 5 is electrically connected to the printed circuit board 13.

  A cam cylinder 14 has a cam pin 14a that engages with the cam groove 11a of the fixed cylinder 11 formed on the outer periphery, and a partial gear 14b formed on a part of the rear part. A cam groove is formed on the inner periphery.

  Reference numeral 15 denotes a front cylinder, which holds the first lens group lens frame 6. Three metal cam pins 16 are erected on the outer periphery of the front cylinder 15 and are engaged with cam grooves of the cam cylinder 14.

  Although not shown, a cam pin is also erected on the second lens group frame 7 and is engaged with a cam groove different from the cam groove with which the front cylinder of the cam cylinder 14 is engaged.

  Reference numeral 20 denotes a diaphragm member according to the present invention, which has an opening 20 k and is disposed between the first lens group 1 and the second lens group 2. A cam pin is also erected on the diaphragm member 20 and is engaged with a cam groove different from the cam groove that engages with the front cylinder 15 of the cam cylinder 14 and the second lens group lens frame 7.

  The cam cylinder 14 is assembled so that the rectilinear movement member 17 and the rectilinear guide plate 18 are rotatable and can move as the cam cylinder 14 moves in the optical axis direction. The rectilinear guide plate 18 is engaged with a rectilinear guide portion 11m formed in the fixed cylinder 11 as shown in the figure, and a drive gear 21 meshed with the partial gear 14b is pivotally supported. The drive gear 21 meshes with the long gear 22. The long gear 22 is driven by a motor and a reduction gear train (not shown).

  As shown in the figure, the rectilinear guide plate 18 comes into contact with and slides on the annular surface of the cam cylinder 14 on the image pickup element 5 side, and the rectilinearly moving member 17 slides on the inner surface of the cam cylinder 14. ing. Further, the linear movement member 17 is engaged with the front cylinder 15, the diaphragm member 20, and the second lens group lens frame 7, and is linearly guided to guide the front cylinder 15, the diaphragm member 20, and the second lens group lens frame 7. A portion 17t is formed.

  Reference numeral 33 denotes an aperture shutter unit, which is fixed to the second lens group frame 7. The aperture shutter unit is provided with an aperture that defines the F number.

  Alternatively, the front tube 15 may be guided in a straight line by the straight guide portion 17t, and the second lens group frame 7 may be guided in a straight line by engaging the front tube 15 that moves straight and the second lens group frame 7.

  Reference numeral 41 denotes a focus motor, to which a feed screw 42 is connected. A rotation-controlled nut 43 is screwed onto the feed screw 42, and the arm portion of the third lens group frame 8 is pressed against the nut 43 by a spring 44. As a result, when the feed screw 42 is rotated by the focus motor 41, the nut 43 moves in the direction of the optical axis O. Accordingly, the third lens group frame 8 is moved in the direction of the optical axis O, and during focusing and collapsing. A move is made.

  FIG. 3 is a schematic longitudinal sectional view of the lens barrel 80 according to the present embodiment at the telephoto end. FIG. 4 is a schematic longitudinal sectional view of the lens barrel 80 according to the present embodiment in a retracted state. In addition, in the following figures, in order to avoid duplication of description, the same functional member will be given the same reference numeral.

  From the wide-angle end state shown in FIG. 2 to the telephoto end state shown in FIG. 3, when a motor (not shown) is driven to rotate in a predetermined direction, the cam barrel 14 is rotated by the long gear 22 and the drive gear 21. As a result, the front cylinder 15, the diaphragm member 20 and the second lens group lens frame 7 engaged with three different types of cam grooves formed on the inner circumference of the cam cylinder 14 are linearly guided by the linear guide section 17 t. The lens moves in the direction of the optical axis O, and zooming is performed.

  On the other hand, from the wide-angle end state shown in FIG. 2 to the retracted state shown in FIG. 4, first, the focus motor 41 is driven to move the third lens group frame 8 to the image sensor 5 side, and then a motor (not shown) is turned on. The cam cylinder 14 is reversely rotated by the long gear 22 and the drive gear 21. As a result, the cam cylinder 14 is guided to the cam groove 11 a formed in the fixed cylinder 11 and moves toward the image pickup device 5, and the front cylinder engaged with three different types of cam grooves formed on the inner periphery of the cam cylinder 14. 15, the diaphragm member 20 and the second lens group lens frame 7 are linearly guided by the linear guide portion 17t and moved in the direction of the image pickup device 5 to be in a retracted state as illustrated. At this time, the rectilinear movement member 17 and the rectilinear guide plate 18 move linearly with the cam cylinder 14.

  The above is the overall schematic configuration and operation outline of the lens barrel 80 according to the present embodiment.

  FIG. 5 is a cross-sectional view showing the position and opening diameter of the opening 20k of the diaphragm member 20 at the wide angle end of the imaging optical system according to the present embodiment.

  Two solid lines A in the figure indicate the outermost rays among the light beams forming the image on the imaging optical system optical axis O between the first lens group 1 and the second lens group 2, and the two solid lines B are The outermost light ray is shown among the light beams that form an image at the highest image height position (100% image height position) in the diagonal direction of the image sensor. A broken line indicates the outermost light beam among the light beams forming an image at a position where the image height of the image sensor is 70%.

  As shown in the figure, the diaphragm member 20 is close to the diaphragm 34 that defines the F number among the two positions where the solid line A and the solid line B intersect between the first lens group 1 and the second lens group 2. Is located at or near the intersection.

  Further, the diameter of the opening 20k of the aperture member 20 is as shown in the figure, a light beam (solid line A) that forms an image at the center of the image sensor and an image at the highest image height (100% image height) of the image sensor. Of the two points where the luminous fluxes forming the solid line (solid line B) intersect, it is preferable that the point is determined at the point that intersects closer to the diaphragm 34 that defines the F number.

  6 is a movement diagram showing the positional relationship of the first lens group 1, the second lens group 2, the third lens group 3 and the diaphragm member 20 of the lens barrel 80 shown in FIGS. It is.

  As shown in the figure, the diaphragm member 20 has, at the wide angle end, between the first lens group 1 and the second lens group 2, of the two positions where the solid line A and the solid line B intersect, on the image plane side intersecting position. Alternatively, it is positioned in the vicinity thereof (see FIG. 5) and moves from the wide-angle end to the telephoto end according to a cam groove formed on the inner periphery of the cam cylinder.

  FIG. 7 is a schematic longitudinal sectional view of another example of the lens barrel 80 according to the present embodiment at the wide-angle end. The lens barrel shown in the figure is different from the lens barrel shown in FIG. 2 in the way of moving the diaphragm member 20.

  The diaphragm member 20 shown in the figure is held by a frictional force with the linearly moving member 17. Further, as shown in the figure, the diaphragm member 20 is formed with an engaging portion 20h, the second lens group lens frame 7 is formed with an engaging portion 7h, and the diaphragm member 20 and the second lens group lens frame 7 are in contact with each other. It is possible to approach up to a predetermined distance, and it cannot be separated beyond a predetermined interval.

  With such a configuration, at the wide angle end, the second lens group lens frame 7 and the diaphragm member 20 are in the most separated state, and the diaphragm member 20 forms the image of the center of the image sensor and the highest image height of the image sensor. Of the two positions where light beams forming an image at a high position (image height 100% position) intersect, they are positioned at or near the position where the image plane side intersects.

  When the first lens group 1 and the second lens group 2 are moved from the wide-angle end state to the telephoto end, the second lens group 2, that is, the second lens group frame 7 moves in the direction of the first lens group 1. The second lens group lens frame 7 and the diaphragm member 20 are moved together after being brought into contact with the diaphragm member 20. On the other hand, the first lens group 1 moves in a direction approaching the second lens group 2 and is in the telephoto end state as shown in FIG.

  FIG. 8 is a movement diagram showing the positional relationship of the first lens group 1, the second lens group 2, the third lens group 3 and the diaphragm member 20 of the lens barrel 80 shown in FIG.

  As shown in the figure, the diaphragm member 20 has, at the wide angle end, between the first lens group 1 and the second lens group 2, of the two positions where the solid line A and the solid line B intersect, on the image plane side intersecting position. Or it is made to position in the vicinity (refer FIG. 5).

The movement of the aperture member 20 from the wide-angle end to the telephoto end follows the paths D ₁ and D _{2 in} the figure, and the movement from the telephoto end to the wide-angle end follows the paths D ₃ and D _{4 in} the figure. Further, in the reverse movement from the intermediate focal length, the inside of the rectangle surrounded by D ₁ , D ₂ , D ₃ , and D ₄ is moved in the illustrated horizontal direction.

  As described above, the diaphragm member 20 may be configured to move by being engaged with the second lens group 2 that is one lens group that moves by zooming.

  FIG. 9 is a cross-sectional view showing the position and opening diameter of the opening 20k of the diaphragm member 20 at the wide-angle end of another example of the imaging optical system according to the present embodiment.

  This figure shows an imaging optical system composed of a first lens group 51 having a positive power and a second lens group 52 having a negative power from the object side. Further, on the image plane side of the first lens group 51, a diaphragm 34 that defines the F number is disposed.

  The two solid lines A indicate the outermost rays among the light beams forming the image on the imaging optical system optical axis O between the first lens group 51 and the second lens group 52, and the two solid lines B indicate diagonal directions. The outermost light ray is shown among the light beams forming the image at the highest image height position (position where the image height is 100%).

  In the case of the optical system as shown in the figure, the diaphragm member 20 defines the F number among the two positions where the solid line A and the solid line B intersect between the first lens group 51 and the second lens group 52. It is located at or near the crossing position closer to the stop 34 to be operated.

  Further, the diameter of the aperture 20k of the diaphragm member 20 forms a light beam (solid line A) that forms an image on the optical axis O and an image at the highest image height (100% image height) as shown in the figure. Of the two points where the luminous flux (solid line B) intersects, it is determined by the point that intersects closer to the diaphragm 34 that defines the F number.

  In this imaging optical system, the first lens group 51 and the second lens group 52 are both moved toward the object side, and the distance is made closer to the focal length on the telephoto side.

  That is, as shown in FIGS. 5 and 9, the aperture member 20 disposed between the lens groups that move for zooming at a wide angle is used as the light beam that forms an image on the optical axis of the imaging optical system. Of the light beams forming the image at the maximum image height position of the imaging optical system, the outermost light beam intersects with the outermost light beam at the intersection position closer to the aperture that defines the F number. That's what it means.

  Examples of the positions of the imaging optical system and the diaphragm member of the present invention applied to the above embodiment will be described below. Symbols used in each example are as follows.

f: Focal length of the entire imaging lens system F: F number 2Y: Diagonal length of the imaging surface of the solid-state imaging device R: Radius of curvature D: Axial distance between top surfaces Nd: Refractive index of lens material with respect to d-line νd: Abbe number of lens material In the embodiment, the shape of the aspherical surface is expressed by the following (Equation 1), where the vertex of the surface is the origin, the X axis is the optical axis direction, and the height in the direction perpendicular to the optical axis is h.

However,
Ai: i-th order aspherical coefficient R: radius of curvature K: conical constant In the following (including the lens data in the table), a power of 10 (for example, 2.5 × 10 ⁻⁰² ) is changed to E (for example, 2. 5E-02). The surface number of the lens data was given in order with the object side of the first lens as one surface.

  Tables 1 and 2 show lens data of the imaging optical system of the example.

  The surface number 5 is the position of the diaphragm member 20 according to the present invention, and the surface number 6 is the position of the diaphragm that defines the F number provided in the diaphragm shutter unit 33.

  FIG. 10 is a cross-sectional view of the imaging optical system shown in the embodiment. FIG. 4A shows the wide-angle end, and FIG. 4B shows the telephoto end.

  The first lens group 1 shown in the figure corresponds to surface numbers 1 to 4 shown in Table 1, the second lens group 2 corresponds to surface numbers 7 to 13, and the third lens group 3 has surface numbers 14 and 15. It is equivalent to. Reference numeral 4 denotes a parallel plate that assumes at least one of an optical low-pass filter, an IR cut filter, a seal glass of a solid-state imaging device, and the like.

  FIG. 11 is a diagram illustrating a light beam path at the wide-angle end when the diaphragm member 20 is removed from the imaging optical system illustrated in the embodiment.

  That is, the light beam path shown in FIG. 10A is the outermost light beam among the light beams forming the image on the optical axis of the imaging optical system from the light beam path shown in FIG. 11 and the maximum image height position of the imaging optical system. Out of the positions where the outermost rays intersect among the light beams forming the image, the light beam passing outside the intersection position on the image plane side (the side farther from the optical axis) is cut by the diaphragm member 20.

  FIG. 12 is a diagram illustrating meridional coma aberration at the wide-angle end of the imaging optical system shown in the embodiment. FIG. 6A shows the meridional coma aberration at an image height of 2.52 mm when the aperture member 20 having an aperture diameter of 3.8 mm is arranged (see FIG. 10A), and FIG. The meridional coma aberration at an image height of 3.6 mm when the aperture member 20 having an aperture diameter of 3.8 mm is arranged is shown.

  For comparison, FIG. 6C shows the meridional coma aberration at the image height of 2.52 mm when the diaphragm member 20 is not provided (see FIG. 11), and FIG. In the absence, the meridional coma aberration at an image height of 3.6 mm is shown.

  As shown in the figure, it can be seen that the coma aberration at the intermediate image height position is reduced by arranging the diaphragm member 20.

  FIG. 13 is a diagram illustrating meridional coma aberration at the telephoto end of the imaging optical system shown in the embodiment.

  FIG. 14 is a diagram illustrating a peripheral light amount ratio at the wide-angle end of the imaging optical system shown in the embodiment.

  As described above, the outermost light beam among the light beams forming an image on the optical axis of the imaging optical system at the wide-angle end, and the outermost light beam among the light beams forming an image at the maximum image height position of the imaging optical system By positioning the diaphragm member at the intersection position closer to the diaphragm that defines the F number among the positions at which the F number intersects, a sufficient amount of light can be secured in the central portion and the outermost peripheral portion, and an intermediate image height portion image can be secured. Imaging optical system that can reduce coma at wide angle and improve imaging performance by cutting a part of the light beam that passes outside the intersection position with the aperture member. And a lens barrel can be obtained.

  In the above description, the diameter of the aperture of the aperture member is the outermost light beam among the light beams that form the image at the center of the image sensor and the light beam that forms the image at the highest image height of the image sensor. Although it demonstrated in the example formed based on the height of an optical axis orthogonal direction of the crossing position near the stop which prescribes F number among the positions where the outermost rays intersect, it is not restricted to this, Of course, it may be formed so as to cut a desired amount of the light flux forming the intermediate image height portion.

  Further, the lens barrel that can be retracted has been described as an example, but the present invention can also be applied to a fixed-length lens barrel that does not retract.

It is an external view which shows the camera which is an example of the imaging device carrying the lens barrel which concerns on this invention. It is a schematic longitudinal cross-sectional view of the state of the lens barrel according to the present embodiment at the wide-angle end. It is a schematic longitudinal cross-sectional view of the state at the telephoto end of the lens barrel according to the present embodiment. It is a schematic longitudinal cross-sectional view of the state at the time of retraction of the lens barrel which concerns on this Embodiment. It is sectional drawing which shows the position and opening diameter of the aperture part of the aperture member at the time of the wide angle end of the lens barrel which concerns on this Embodiment. 5 is a movement diagram showing a positional relationship in each state of a first lens group, a second lens group, a third lens group, and a diaphragm member of the lens barrel shown in FIGS. It is a schematic longitudinal cross-sectional view of the state at the time of the wide-angle end of the other example of the lens barrel which concerns on this Embodiment. FIG. 8 is a movement diagram showing a positional relationship in each state of the first lens group, the second lens group, the third lens group, and the diaphragm member of the lens barrel shown in FIG. 7. It is sectional drawing which shows the position and opening diameter of the aperture part of the aperture member at the time of the wide angle end of another example of the imaging optical system which concerns on this Embodiment. It is sectional drawing of the imaging optical system shown in the Example. It is a figure which shows the light beam path | route in a wide angle end at the time of removing a diaphragm member from the imaging optical system shown in the Example. It is a figure which shows the meridional coma aberration at the time of the wide angle end of the imaging optical system shown in an Example. It is a figure which shows the meridional coma aberration at the time of the telephoto end of the imaging optical system shown in the Example. It is a figure which shows the peripheral light amount ratio at the time of the wide angle end of the imaging optical system shown in the Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st lens group 2 2nd lens group 3 3rd lens group 4 Optical filter 5 Image pick-up element 6 1st lens group frame 7 2nd lens group frame 8 3rd lens group frame 11 Fixed cylinder 12 Ground plate 13 Printed circuit board 14 cam cylinder 15 front cylinder 17 rectilinearly moving member 18 rectilinear guide plate 20 aperture member 21 drive gear 22 long gear 33 aperture shutter unit 41 focus motor 80 lens barrel

Claims (8)

In an imaging optical system configured with a plurality of lens groups and configured to move and vary at least two lens groups among the plurality of lens groups,
A diaphragm member having an opening is disposed between the moving lens groups,
When at least the imaging optical system is in the wide-angle state, the outermost light beam forming the image on the optical axis of the imaging optical system and the light beam forming the image at the maximum image height position of the imaging optical system An imaging optical system, wherein the diaphragm member is located at an intersection position closer to the diaphragm that defines the F number among positions where the outermost rays intersect. The shape of the aperture of the aperture member is the outermost light beam forming the image on the optical axis of the imaging optical system and the most light beam forming the image at the maximum image height position of the imaging optical system. 2. The imaging according to claim 1, wherein the imaging is formed based on a height in a direction orthogonal to the optical axis of an intersection position closer to a diaphragm defining an F number among positions intersecting with an outer light beam. Optical system. An imaging optical system configured with a plurality of lens groups and configured to move and vary at least two lens groups among the plurality of lens groups, and is movable between the lens groups, and an opening is formed. A diaphragm member, and an image sensor that photoelectrically converts subject light by the imaging optical system,
When at least the imaging optical system is in the wide-angle state, the outermost light beam among the light beams forming the image at the center of the imaging surface of the imaging device and the image at the highest image height on the imaging surface of the imaging device The lens barrel is characterized in that the diaphragm member is moved to an intersection position closer to the diaphragm defining the F number among the positions where the outermost rays of the luminous fluxes forming the beam intersect. The shape of the aperture of the aperture member forms the outermost light beam among the light beams forming the image at the center of the imaging surface of the image sensor and the image at the highest image height on the imaging surface of the image sensor. 4. The light beam is formed on the basis of the height in the direction perpendicular to the optical axis at the intersection position closer to the stop defining the F number among the positions where the outermost rays of the light beams intersect. The lens barrel described in 1. 5. The lens barrel according to claim 3, wherein at least two lens groups that are moved by zooming in the imaging optical system and the diaphragm member are engaged with and moved by a cam barrel. 5. The lens barrel according to claim 3, wherein the diaphragm member is moved by being engaged with one lens group that is moved by zooming. 6. The lens barrel according to claim 3, wherein the lens barrel is configured to be retractable. An imaging apparatus comprising the lens barrel according to claim 3.

Images