Lens unit and lens barrel

Abstract

To improve optical performance without an increase in size.SOLUTION: A second lens unit 20 of the present invention has: a second lens holding frame 22 that holds a reference lens 211 of a plurality of lenses; a first adjustment frame 23 that holds a first adjustment lens 212 of the plurality of lenses, and is adjustable in an optical axis orthogonal direction relative to the second lens holding frame 22; and a second adjustment frame 24 that holds a second adjustment lens 213 of the plurality of lenses, and is adjustable in the optical axis orthogonal direction relative to the second lens holding frame 22. The first adjustment frame 23 is arranged on an object side in an optical axis direction relative to the second lens holding frame 22, and the second adjustment frame 24 is arranged on an image side in the optical axis direction relative to the second lens holding frame 22.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a lens unit and the like. In particular, it relates to a lens unit and the like used in an imaging device.

Background Art

[0002] In a lens barrel, an optical adjustment mechanism such as eccentricity adjustment and lens interval adjustment is provided to correct positional deviations such as lens tilt and eccentricity generated during the manufacturing process. Eccentricity adjustment is an adjustment in which a lens to be adjusted is moved in a direction perpendicular to the optical axis with respect to a reference lens.

[0003] Patent Document 1 discloses a lens barrel having two adjustment mechanisms, namely eccentricity adjustment and tilting adjustment, for a second lens holding frame that holds a second optical element with respect to a first lens holding frame that holds a first optical element.

[0004] Patent Document 2 discloses a lens barrel having a plurality of lenses and lens holding frames, wherein the lens holding frames are held by a housing via intermediate cylinders, and the intermediate cylinders are provided with centering means for eccentrically displacing the lens holding frames in a direction perpendicular to the optical axis.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] In recent years, the image quality and pixel count of photographed images have been improving, and stricter positional accuracy has been required for lens misalignment generated during the manufacturing process of lens barrels. In response to such requirements, independent optical adjustments may be performed on a plurality of lenses included in a lens group.

[0007] However, in the technology disclosed in Patent Document 1, the configuration is not such that a plurality of lenses are independently optically adjusted with respect to the reference lens. Further, when adjustment mechanisms for different optical elements are provided, there is a risk that the lens frame will become large.

[0008] In the technology disclosed in Patent Document 2, although adjustment mechanisms for a plurality of lenses are provided with respect to the reference lens, since the adjustment mechanisms are arranged so as to be close to each other, it is necessary to provide a space such that the adjustment mechanisms do not interfere with each other, and thus there is a risk that the entire device will become large.

[0009] The present invention has been made in view of the above-described problems, and an object thereof is to improve optical performance without increasing the size.

Means for Solving the Problems

[0010] The present invention is a lens unit having a plurality of lenses, including a holding frame that holds a first lens among the plurality of lenses, a first adjustment frame that holds a first adjustment lens among the plurality of lenses and is adjustable in a direction orthogonal to the optical axis with respect to the holding frame, and a second adjustment frame that holds a second adjustment lens among the plurality of lenses and is adjustable in a direction orthogonal to the optical axis with respect to the holding frame, wherein the first adjustment frame is arranged on the object side in the optical axis direction with respect to the holding frame, and the second adjustment frame is arranged on the image side in the optical axis direction with respect to the holding frame.

Effects of the Invention

[0011] According to the present invention, it is possible to improve optical performance without increasing the size.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0013] Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings. <First Embodiment> FIG. 1 is an exploded perspective view of the imaging device 1. FIGS. 1(a) and 1(b) are perspective views seen from different directions. In each figure including FIG. 1, the optical axis O of the imaging device 1 is indicated by a dashed line. Among the optical axis directions, the side of the first lens unit 10 described later is referred to as the object side (or front side), and the side of the imaging element unit 300 described later is referred to as the image side (or rear side).

[0014] The imaging device 1 includes a lens barrel 100, an imaging element unit 300, and the like. The lens barrel 100 of the present embodiment is configured to include one fixed lens unit and three moving lens units. Specifically, the lens barrel 100 has a first lens unit 10, a second lens unit 20, a third lens unit 30, a fourth lens unit 40, a front housing member 60, and a rear housing member 70. The first lens unit 10 (a group of lens units) is a lens unit fixed in the optical axis direction. The second lens unit 20 (a second group of lens units) is a lens unit that moves in the optical axis direction to perform a zoom operation. The third lens unit 30 (a third group of lens units) is a lens unit that moves in the optical axis direction to perform a zoom operation. The fourth lens unit 40 (a fourth group of lens units) is a lens unit that moves in the optical axis direction to perform a focusing operation.

[0015] The first lens unit 10 includes a first lens group 11 and a first lens holding frame 12. The first lens group 11 is held by the first lens holding frame 12. The first lens holding frame 12 is fixed to the front housing member 60.

[0016] The front housing member 60 and the rear housing member 70 function as the housing of the lens barrel 100. Specifically, the front housing member 60 and the rear housing member 70 accommodate the first lens unit 10, the second lens unit 20, the third lens unit 30, and the fourth lens unit 40, and protect each lens unit from external shocks. The front housing member 60 and the rear housing member 70 are fixed integrally by screws or the like.

[0017] FIG. 2 is an exploded perspective view of the second lens unit 20 (optical adjustment group). The second lens unit 20 includes a second lens group 21. The second lens group 21 is a zoom lens group including a plurality of lenses. Specifically, the second lens group 21 includes a reference lens 211, a first adjustment lens 212, and a second adjustment lens 213.

[0018] The reference lens 211 is held by the second lens holding frame 22. The first adjustment lens 212 is held by the first adjustment frame 23. The first adjustment frame 23 is held by the second lens holding frame 22. The first adjustment frame 23 is located on the object side in the optical axis direction with respect to the second lens holding frame 22. Also, the first adjustment frame 23 is adjustable in the direction orthogonal to the optical axis with respect to the second lens holding frame 22. The second adjustment lens 213 is held by the second adjustment frame 24. The second adjustment frame 24 is held by the second lens holding frame 22 via a plurality of adjustment members 25. The second adjustment frame 24 is located on the image side in the optical axis direction with respect to the second lens holding frame 22. Also, the second adjustment frame 24 is adjustable in the direction orthogonal to the optical axis with respect to the second lens holding frame 22.

[0019] The second lens holding frame 22 is engaged with the shaft-shaped two-group guiding member 27 (see FIGS. 1 and 4) and is supported so as to be movable forward and backward (movable) in the optical axis direction. Further, the second lens holding frame 22 is also engaged with the shaft-shaped two-group rotation restricting member 28 and is supported so that the center of the second lens group 21 is located on the optical axis. The two-group guiding member 27 and the two-group rotation restricting member 28 are guide bars and guide the forward and backward movement of the second lens holding frame 22 in the optical axis direction.

[0020] The second lens holding frame 22 rotatably holds the two-group rack 26. The two-group rack 26 is engaged with the screw portion 29a of the two-group driving member 29 (see FIG. 1). Therefore, the second lens holding frame 22 moves forward and backward in the optical axis direction together with the two-group rack 26 by the driving of the two-group driving member 29.

[0021] The diaphragm unit 50 is fixed to the second lens holding frame 22 and adjusts the amount of incident light to the imaging element unit 300. The diaphragm unit 50 can change the aperture diameter by the driving of the diaphragm unit driving portion 501 and adjust the amount of light taken in from the subject. The diaphragm unit 50 is electrically connected to a lens driving portion (not shown). Note that the detailed configurations of the second lens holding frame 22, the first adjustment frame 23, the second adjustment frame 24, and the adjustment member 25, and the optical adjustment mechanism using them will be described later.

[0022] The third lens unit 30 has a third lens group 31 (see FIG. 1). The third lens group 31 is a zoom lens and is held by the third lens holding frame 32. The third lens holding frame 32 is engaged with the shaft-shaped two-group guiding member 27 (see FIGS. 1 and 5) and is supported so as to be movable forward and backward (movable) in the optical axis direction. Further, the third lens holding frame 32 is also engaged with the shaft-shaped two-group rotation restricting member 28 and is supported so that the center of the third lens group 31 is located on the optical axis. That is, the two-group guiding member 27 and the two-group rotation restricting member 28, together with the second lens holding frame 22 described above, also guide the forward and backward movement of the third lens holding frame 32 in the optical axis direction.

[0023] The third lens holding frame 32 rotatably holds the three-group rack 33 (see FIGS. 1, 4, and 5). The three-group rack 33 engages with the screw portion 34a of the three-group drive member 34 (see FIG. 1). Therefore, the third lens holding frame 32 moves forward and backward in the optical axis direction together with the three-group rack 33 by the drive of the three-group drive member 34.

[0024] The fourth lens unit 40 has a fourth lens group 41 (see FIG. 1). The fourth lens group 41 is a focus lens and is held by the fourth lens holding frame 42. The fourth lens holding frame 42 engages with the shaft-like four-group guide member 44 and is supported so as to be movable forward and backward in the optical axis direction. Further, the fourth lens holding frame 42 also engages with the shaft-like four-group rotation restricting member 45 and is supported so that the center of the fourth lens group 41 is located on the optical axis.

[0025] The fourth lens holding frame 42 rotatably holds the four-group rack 43. The four-group rack 43 engages with the screw portion 46a of the four-group drive member 46. Therefore, the fourth lens holding frame 42 moves forward and backward in the optical axis direction together with the four-group rack 43 by the drive of the four-group drive member 46.

[0026] The imaging element unit 300 is held by the rear housing member 70, receives the light beam guided by the first lens unit 10, the aperture unit 50, the second lens unit 20 to the fourth lens unit 40, and converts it into image information.

[0027] Next, the detailed configuration of the second lens unit 20 having the optical adjustment mechanism will be described with reference to FIGS. 2 to 6. Fig. 3(a) is a cross-sectional view of the second lens unit 20 (optical adjustment group) cut along the optical axis O and the line I-I shown in Fig. 4. Fig. 4 is a front view of the second lens unit 20 (optical adjustment group) and the third lens unit 30 as seen from the object side (front side). Fig. 5 is a rear view of the second lens unit 20 (optical adjustment group) and the third lens unit 30 as seen from the image side (rear side). Fig. 6 is a view showing the configuration around the adjustment member 25 of the second lens unit 20. Note that in Figs. 3 to 6, illustrations of configurations unnecessary for the description are omitted.

[0028] First, the relationship between the first adjustment frame 23 and the second lens holding frame 22 will be described. The first adjustment frame 23 that holds the first adjustment lens 212 is held by the second lens holding frame 22 such that the first adjustment lens 212 is disposed on the object side in the optical axis direction with respect to the reference lens 211. As shown in Fig. 3(a), a space is formed between the first adjustment frame 23 and the second lens holding frame 22. The space extends radially around the optical axis O.

[0029] The first adjustment frame 23 has a fastening portion 231 formed in the vicinity of the outer peripheral edge of the first adjustment frame 23. The fastening portion 231 is an example of the first fixing portion and is a portion for fixing the first adjustment frame 23 to the second lens holding frame 22. A through hole 232 for inserting a screw 233 as a fastening member in the optical axis direction is formed in the fastening portion 231. The fastening portions 231 are arranged at substantially equal intervals with spaces therebetween on the circumference centered on the optical axis O (here, three). The second lens holding frame 22 has a fastening portion 221 formed in the vicinity of the outer peripheral edge of the second lens holding frame 22. The fastening portion 221 extends in the optical axis direction from the second lens holding frame 22 toward the image side, and a female screw portion 222 into which the screw 233 is screwed is formed. Further, the fastening portion 221 has a certain length along the optical axis direction to ensure the length of the female screw portion 222. The fastening portions 221 are arranged at substantially equal intervals with spaces therebetween on the circumference centered on the optical axis O (here, three). The female screw portion 222 of the fastening portion 221 of the second lens holding frame 22 and the through hole 232 of the first adjustment frame 23 communicate with each other in the optical axis direction. Insert a screw 233 into the through-hole 232 of the fastening portion 231 of the first adjustment frame 23 from the object side in the optical axis direction. By fastening the screw 233 inserted through the through-hole 232 to the female screw portion 222 of the fastening portion 221 of the second lens holding frame 22, the first adjustment frame 23 can be fixed to the second lens holding frame 22.

[0030] In this embodiment, the first adjustment frame 23 is adjustable with respect to the second lens holding frame 22 in a direction orthogonal to the optical axis. That is, before fastening the first adjustment frame 23 to the second lens holding frame 22 with the screw 233, the first adjustment frame 23 can be translated in a direction orthogonal to the optical axis with respect to the second lens holding frame 22. By translating the first adjustment frame 23 with respect to the second lens holding frame 22 in a direction orthogonal to the optical axis, the eccentricity position of the first adjustment lens 212 held by the first adjustment frame 23 with respect to the reference lens 211 held by the second lens holding frame 22 can be adjusted. After adjusting the eccentricity position, access the screw 233 from the object side (front side) using a fastening tool and rotate the screw 233 to fasten the plurality of fastening portions 221 provided on the second lens holding frame 22 and the fastening portion 231 of the first adjustment frame 23.

[0031] FIG. 3(b) is an enlarged view of a portion A shown in FIG. 3(a). As shown in FIG. 3(b), the inner diameter D1 of the through-hole 232 of the first adjustment frame 23 is formed to be somewhat larger than the inner diameter D2 of the female screw portion 222 of the second lens holding frame 22. Therefore, even if the first adjustment frame 23 is translated in a direction orthogonal to the optical axis with respect to the second lens holding frame 22, the screw 233 can be fastened to the female screw portion 222 without interfering with the through-hole 232.

[0032] Next, the relationship between the second adjustment frame 24 and the second lens holding frame 22 will be described. The second adjustment frame 24 that holds the second adjustment lens 213 is held by the second lens holding frame 22 via an adjustment member 25 such that the second adjustment lens 213 is disposed on the image side in the optical axis direction with respect to the reference lens 211. Further, the adjustment member 25 is engaged with an adjustment member holding portion 223 provided on the outer periphery of the second lens holding frame 22. The adjustment member 25 and the adjustment member holding portion 223 are arranged at intervals on the circumference centered on the optical axis O, and a plurality (here, three) of them are arranged at substantially equal intervals. The adjustment member holding portion 223 extends in the optical axis direction toward the image side from the second lens holding frame 22 and has a certain length along the optical axis direction to hold the adjustment member 25. Here, the adjustment member holding portion 223 and the fastening portion 221 described above have a certain length along the optical axis direction, and are arranged such that their phases do not overlap on the circumference when viewed from the optical axis direction. Therefore, two adjustment mechanisms can be arranged without increasing the size of the second lens holding frame 22.

[0033] Further, the adjustment member 25 has a cylindrical head portion 251 centered on an axis extending in the radial direction in the direction orthogonal to the optical axis O around the optical axis O, and an eccentric shaft portion 252 centered on an axis eccentric from the central axis of the head portion 251. The head portion 251 is formed with an operation portion 251a into which an adjustment tool is inserted to rotate the adjustment member 25 on the outer surface (see FIG. 2). The head portion 251 is rotatably engaged in a press-fitted state with a groove parallel to the optical axis O formed by the regulating portions 223a and 223b of the adjustment member holding portion 223. The eccentric shaft portion 252 is eccentric with respect to the rotation center of the adjustment member 25. The eccentric shaft portion 252 is rotatably engaged in a press-fitted state with the adjustment member engaging portion 241 of the second adjustment frame 24.

[0034] Using an adjustment tool, access the operation portion 251a of the adjustment member 25 from the outside of the second lens unit 20 toward the optical axis O and rotate the adjustment member 25. When the adjustment member 25 is rotated, since the head portion 251 is regulated by the regulating portions 223a and 223b of the adjustment member holding portion 223, the dashed line C1 indicating the center of the eccentric shaft portion 252 in FIG. 6(a) moves in the direction perpendicular to the optical axis as shown by the solid line C2 in FIG. 6(b). Due to the movement of the eccentric shaft portion 252, the adjustment member engaging portion 241 engaged with the eccentric shaft portion 252 also moves in the same manner, so that the second adjustment frame 24 provided with the adjustment member engaging portion 241 moves in the direction perpendicular to the optical axis with respect to the second lens holding frame 22. Here, by operating two or more adjustment members 25, the second adjustment frame 24 is moved to a position in an arbitrary plane perpendicular to the optical axis. In this way, by translating the second adjustment frame 24 parallel to the second lens holding frame 22 in the direction perpendicular to the optical axis, the eccentric position of the second adjustment lens 213 held by the second adjustment frame 24 with respect to the reference lens 211 held by the second lens holding frame 22 can be adjusted.

[0035] Note that the adjustment member 25 has a screw 253 as a fastening member inside. The screw 253 penetrates the head portion 251 and the eccentric shaft portion 252 in the axial direction of the eccentric shaft portion 252 and can rotate independently of the head portion 251 and the eccentric shaft portion 252. A female screw portion 243 into which the screw 253 is screwed is formed in the adjustment member engaging portion 241 of the second adjustment frame 24. The adjustment member engaging portion 241 is an example of a second fixing portion and is a portion for fixing the second adjustment frame 24 to the second lens holding frame 22. After adjusting the eccentric position of the second adjustment frame 24, access the screw 253 from the outside using a fastening tool, rotate the screw 253, and fasten it to the female screw portion 243 of the adjustment member engaging portion 241. Therefore, the eccentric position adjusted by the adjustment member 25 is fixed, and the second adjustment frame 24 can be fixed to the second lens holding frame 22.

[0036] Further, since the second adjustment frame 24 is held by the second lens holding frame 22 via the adjustment member 25, the second adjustment frame 24 and the second lens holding frame 22 are not in direct contact. There is a space between the second adjustment frame 24 and the second lens holding frame 22 that allows the second adjustment frame 24 to translate. Further, the second adjustment frame 24 has a cylindrical extension portion 242 extending toward the object side around the optical axis O (see Fig. 3(a)). The extension portion 242 is positioned so as to annularly cover the holding portion 224 where the second lens holding frame 22 holds the reference lens 211 from the outside. That is, the extension portion 242 is arranged so as to overlap a part (holding portion 224) of the second lens holding frame 22 when viewed in the direction orthogonal to the optical axis. Therefore, even if the second lens holding frame 22 and the second adjustment frame 24 do not come into direct contact, it is possible to prevent the intrusion of unnecessary light and dust near the optical axis O.

[0037] Next, the operation of adjusting the eccentric position using the two adjustment mechanisms of the first adjustment frame 23 and the second adjustment frame 24 will be described. The adjustment operation is performed with the aperture unit 50 removed. Since the first adjustment frame 23 is arranged on the object side of the second lens holding frame 22, it is possible to perform the eccentric adjustment operation by inserting a tool from the object side. On the other hand, the second adjustment frame 24 performs the adjustment operation using an adjustment member 25 facing in the direction orthogonal to the optical axis around the optical axis O. Therefore, it is possible to perform the eccentric adjustment operation by inserting a tool from the direction orthogonal to the optical axis and rotating the adjustment member 25. Thus, the two adjustment mechanisms provided in the second lens unit 20 can both perform the adjustment operation in one posture as shown in Fig. 3.

[0038] As shown in Fig. 4, the second lens holding frame 22 is movably engaged in the optical axis direction with the two-group guide member 27 and the two-group rotation restricting member 28 by engaging portions 225, respectively. The engaging portions 225 are arranged at different phases on the circumference around the optical axis O from the adjustment member holding portion 223 of the second lens holding frame 22. Also, as shown in Fig. 5, the third lens holding frame 32 is movably engaged in the optical axis direction with the two-group guide member 27 and the two-group rotation restricting member 28 by engaging portions 321, respectively. The engaging portion 225 and the engaging portion 321 are both arranged in the same phase around the optical axis O with respect to the two-group guide members 27 and the two-group rotation restricting members 28. Therefore, the third lens holding frame 32 can move in the optical axis direction without interfering with the adjusting member 25 having a length in the optical axis direction and the adjusting member holding portion 223. Here, the second lens holding frame 22 and the third lens holding frame 32 can move independently and can approach each other to a position where a part of each other overlaps when viewed from a direction orthogonal to the optical axis. Also, the engaging portion 225 and the engaging portion 321 are arranged so as not to overlap the adjusting member 25 when viewed from the optical axis direction. Therefore, the first adjusting frame 23 and the second adjusting frame 24 can move in the optical axis direction without increasing the size of the lens barrel.

[0039] As described above, according to the present embodiment, the first adjusting frame 23 that is adjustable in a direction orthogonal to the optical axis with respect to the second lens holding frame 22 is arranged on the object side in the optical axis direction with respect to the second lens holding frame 22. On the other hand, the second adjusting frame 24 that is adjustable in a direction orthogonal to the optical axis with respect to the second lens holding frame 22 is arranged on the image side in the optical axis direction. In this way, by arranging the first adjusting frame 23 and the second adjusting frame 24 with the second lens holding frame 22 interposed therebetween, it is possible to arrange them so as to suppress interference between the two adjusting functions, and thus it is possible to suppress an increase in the size of the lens unit and the lens barrel.

[0040] Also, according to the present embodiment, the fastening portion 231 of the first adjusting frame 23 and the adjusting member engaging portion 241 of the second adjusting frame 24 are arranged so as not to overlap when viewed from the optical axis direction. Therefore, the first adjusting frame 23 and the second adjusting frame 24 can be fixed to the second lens holding frame 22 without increasing the size of the second lens holding frame 22.

[0041] Also, according to the present embodiment, the first adjusting frame 23 is held by the second lens holding frame 22 by being fastened to a plurality of fastening portions 221 extending in the optical axis direction provided on the second lens holding frame 22 with a plurality of screws 233, respectively. On the other hand, the second adjusting frame 24 is held by the second lens holding frame 22 via a plurality of adjusting members 25. Therefore, even with two adjusting mechanisms, adjustment work can be performed in one posture.

[0042] Further, according to the present embodiment, the screw 233 for fixing the first adjustment frame 23 to the second lens holding frame 22 and the screw 253 for fixing the second adjustment frame 24 to the second lens holding frame 22 can be accessed from different directions respectively. Therefore, since it is easy to arrange the screw 233 and the screw 253 so as not to interfere with each other, an increase in the size of the lens barrel can be suppressed.

[0043] Further, according to the present embodiment, the adjustment member 25 is rotatable about an axis along the direction orthogonal to the optical axis on the outer periphery of the second lens holding frame 22 and has a portion eccentric with respect to the axis. Therefore, by rotating the adjustment member 25, the eccentricity adjustment of the second adjustment frame 24 can be performed.

[0044] Further, according to the present embodiment, the second adjustment frame 24 has a cylindrical extension portion 242 extending toward the object side around the optical axis O, and the extension portion 242 is arranged so as to overlap a part of the second lens holding frame 22 when viewed from the direction orthogonal to the optical axis. Therefore, it is possible to prevent the intrusion of unnecessary light and dust into the vicinity of the optical axis with respect to the second lens holding frame 22 and the second adjustment frame 24.

[0045] As described above, the present invention has been described in detail based on its preferred embodiments. However, the present invention is not limited to specific embodiments, and various forms within the scope not departing from the gist of the present invention are also included in the present invention.

[0046] In the above-described embodiment, the case where the adjustment member 25 is used when the second adjustment frame 24 is translated in the direction orthogonal to the optical axis with respect to the second lens holding frame 22 has been described. However, the present invention is not limited to this case. The method of translating the second adjustment frame 24 in the direction orthogonal to the optical axis with respect to the second lens holding frame 22 may be the same as the method of translating the first adjustment frame 23 in the direction orthogonal to the optical axis with respect to the second lens holding frame 22.

[0047] In the above-described embodiment, the female screw portions 222 and 243 are not limited to the case where screws are formed in advance, and screws may be formed by screwing in the screws 233 and 253. Further, the fastening members are not limited to the screws 233 and 253, and may be rivets or the like.

[0048] Further, the disclosure of the present embodiment includes the following configurations. (Configuration 1) A lens unit having a plurality of lenses, a holding frame that holds a first lens among the plurality of lenses, a first adjustment frame that holds a first adjustment lens among the plurality of lenses and is adjustable in a direction orthogonal to the optical axis with respect to the holding frame, a second adjustment frame that holds a second adjustment lens among the plurality of lenses and is adjustable in a direction orthogonal to the optical axis with respect to the holding frame, and the first adjustment frame is disposed on the object side in the optical axis direction with respect to the holding frame, the second adjustment frame is disposed on the image side in the optical axis direction with respect to the holding frame. A lens unit characterized by this. (Configuration 2) a first fixing portion for fixing the first adjustment frame to the holding frame, a second fixing portion for fixing the second adjustment frame to the holding frame. The lens unit according to Configuration 1, characterized by having (Configuration 3) The first fixing portion and the second fixing portion are arranged so as not to overlap each other when viewed from the optical axis direction. The lens unit according to Configuration 2, characterized by this. (Configuration 4) a first fastening member for fixing the first adjustment frame adjusted in the direction orthogonal to the optical axis to the first fixing portion, a second fastening member for fixing the second adjustment frame adjusted in the direction orthogonal to the optical axis to the second fixing portion, and the first fastening member and the second fastening member are respectively accessible from different directions. The lens unit according to Configuration 2 or 3, characterized by this. (Configuration 5) The first adjustment frame is held by the holding frame by being fastened to a plurality of fastening parts provided on the holding frame and extending in the optical axis direction, respectively, with a plurality of fastening members. The lens unit according to Configuration 1, wherein the second adjustment frame is held by the holding frame via a plurality of adjustment members. (Configuration 6) The lens unit according to Configuration 5, wherein the adjustment member is rotatable with respect to an axis along the direction orthogonal to the optical axis on the outer periphery of the holding frame and has a portion eccentric with respect to the axis. (Configuration 7) The fastening parts and the adjustment members are respectively arranged at intervals on the circumference around the optical axis. The lens unit according to Configuration 5 or 6, wherein the fastening parts and the adjustment members are arranged so as not to overlap each other when viewed from the optical axis direction. (Configuration 8) The second adjustment frame has a cylindrical extension portion extending toward the object side around the optical axis. The lens unit according to any one of Configurations 1 to 7, wherein the extension portion is arranged so as to overlap a part of the holding frame when viewed from the direction orthogonal to the optical axis. (Configuration 9) The lens unit according to any one of Configurations 1 to 8, wherein the holding frame is movable in the optical axis direction by a guide bar. (Configuration 10) A lens unit according to any one of Claims 1 to 9, and a lens barrel having a second lens unit arranged on the image side of the first lens unit, where the first lens unit is the lens unit described above. The lens barrel, wherein the first lens unit and the second lens unit are movable in the optical axis direction by the same guide bar. (Configuration 11) having a plurality of guide bars, The second adjustment frame is held by the holding frame via a plurality of adjustment members. The first lens unit and the second lens unit each have a plurality of engaging portions guided by the plurality of guide bars. The lens barrel according to Configuration 10, wherein the plurality of engaging portions and the plurality of adjusting members are arranged so as not to overlap when viewed in the optical axis direction. (Configuration 12) The lens barrel according to Configuration 10 or 11, wherein the first lens unit and the second lens unit are movable independently in the optical axis direction and are movable to positions where a part of each other overlaps when viewed in a direction orthogonal to the optical axis.

Description of Reference Numerals

[0049] 100: Lens barrel 20: Second lens unit 22: Second lens holding frame 211: Reference lens 23: First adjustment frame 212: First adjustment lens 24: Second adjustment frame 213: Second adjustment lens

Claims

1. A lens unit having a plurality of lenses, a holding frame for holding a first lens among the plurality of lenses, a first adjustment frame for holding a first adjustment lens among the plurality of lenses and being adjustable in a direction orthogonal to the optical axis with respect to the holding frame, a second adjustment frame for holding a second adjustment lens among the plurality of lenses and being adjustable in a direction orthogonal to the optical axis with respect to the holding frame, and having the first adjustment frame is disposed on the object side in the optical axis direction with respect to the holding frame, the second adjustment frame is disposed on the image side in the optical axis direction with respect to the holding frame, and the lens unit is characterized in that.

2. a first fixing portion for fixing the first adjustment frame to the holding frame, a second fixing portion for fixing the second adjustment frame to the holding frame, and the lens unit according to claim 1, characterized in that it has.

3. The lens unit according to claim 2, characterized in that the first fixing portion and the second fixing portion are arranged so as not to overlap each other when viewed from the optical axis direction.

4. a first fastening member for fixing the first adjustment frame adjusted in the direction orthogonal to the optical axis to the first fixing portion, a second fastening member for fixing the second adjustment frame adjusted in the direction orthogonal to the optical axis to the second fixing portion, and having the lens unit according to claim 2 or 3, characterized in that the first fastening member and the second fastening member are respectively accessible from different directions.

5. the first adjustment frame is held by the holding frame by being fastened to a plurality of fastening portions extending in the optical axis direction provided on the holding frame with a plurality of fastening members respectively, the second adjustment frame is held by the holding frame via a plurality of adjustment members, and the lens unit according to claim 1, characterized in that.

6. The adjustment member is rotatable about an axis along the direction orthogonal to the optical axis on the outer periphery of the holding frame, and has a portion eccentric with respect to the axis, according to the lens unit of claim 5.

7. The fastening portion and the adjustment member are each arranged at intervals on a circumference around the optical axis, The fastening portion and the adjustment member are arranged so as not to overlap each other when viewed from the optical axis direction, according to the lens unit of claim 5 or 6.

8. The second adjustment frame has a cylindrical extension portion extending toward the object side around the optical axis, The extension portion is arranged so as to overlap a part of the holding frame when viewed from the direction orthogonal to the optical axis, according to the lens unit of claim 1 or 2.

9. The holding frame is movable in the optical axis direction by a guide bar, according to the lens unit of claim 1 or 2.

10. The lens unit according to claim 1, When the lens unit is a first lens unit, a second lens unit arranged on the image side of the first lens unit, a lens barrel having, The first lens unit and the second lens unit are movable in the optical axis direction by the same guide bar, characterized in that the lens barrel.

11. Having a plurality of the guide bars, The second adjustment frame is held by the holding frame via a plurality of adjustment members, The first lens unit and the second lens unit each have a plurality of engaging portions guided by the plurality of guide bars, The plurality of engaging portions and the plurality of adjustment members are arranged so as not to overlap each other when viewed from the optical axis direction, according to the lens barrel of claim 10.

12. The first lens unit and the second lens unit are movable independently in the optical axis direction, and are movable to positions where a part of each other overlaps when viewed from a direction orthogonal to the optical axis, according to claim 10 or 11, the lens barrel being characterized by this.

Images