JPH0526169B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a Ziem lens barrel, more specifically,
The present invention relates to a zoom lens barrel having a means for correcting aberrations according to an object point distance.

The optical system of photographic lens barrels is generally designed based on a single focal point (usually at infinity), and aberrations tend to increase as the distance to the object point changes from the reference point. ing.
For this reason, in a normal single focus lens barrel,
A part of the lens system is moved based on the focusing operation to correct aberrations according to the object point distance.

However, in conventional zoom lens barrels, due to the relatively small aperture of the zoom lens barrel and the complicated frame structure itself for zooming, it is difficult to reduce aberrations depending on the object point distance. No correction was made, and the optical characteristics deteriorated due to increased aberrations.

For example, a well-known two-group zoom lens barrel has a cylindrical fixed frame 1 that is attached to the camera body at the rear end mount, and A zoom ring 2 is rotatably fitted on the outer periphery, a front group holding frame 3 is fitted to the tip of the fixed frame 1, and the front group holding frame 3 is helicoidally coupled to hold the front group lens. The main body is composed of a supporting focus ring 4 and a rear group holding frame 5 that is fitted in the middle of the fixed frame 1 and supports a rear group lens consisting of the second and third group lenses. However, there was no particular mechanism for correcting aberrations depending on the object point distance. That is, in this zoom lens barrel,
When the zoom ring 2 is rotated, the cam slots 2a and 2b formed in the ring 2, the cam pins 6 and 7 installed in the front group holding frame 3 and the rear group holding frame 5, and the fixed frame 1 are drilled. A long guide hole 1a in the optical axis direction provided,
1b, the front group holding frame 3 and the rear group holding frame 5 move independently of each other in the optical axis direction, and zooming is performed by changing the positions of the front group lens and the rear group lens. Ta. Furthermore, when the focus ring 4 is rotated, the focus ring 4 moves in the optical axis direction while rotating with respect to the front group holding frame 3 due to the action of the helicoid screws 4a and 3a, and only the front group lens changes its position. Focusing was beginning to take place. Therefore, aberrations have not been corrected in accordance with the object point distance.

In this way, in conventional zoom lens barrels, aberrations were not corrected according to the object point distance, so if you tried to increase the diameter of the zoom lens barrel with the conventional configuration, Distance-dependent aberrations become so large that they cannot be ignored at distances far from the reference, resulting in the inconvenience that only low-performance zoom lens barrels with limited usable distances can be obtained.

In view of the above-mentioned points, it is an object of the present invention to:
It is an object of the present invention to provide a zoom lens barrel in which a part or all of a lens system other than the above-mentioned focusing lens system is moved to correct aberrations according to an object point distance.

Hereinafter, the present invention will be explained based on illustrated embodiments.

FIG. 2 shows a zoom lens barrel showing one embodiment of the present invention. This zoom lens barrel is
A fixed frame 1 formed similarly to the corresponding member in the conventional zoom lens barrel shown in FIG. 1 above.
1. The zoom ring 12, the front group holding frame 13, the focus ring 14, and the rear holding frame 15 that is fitted in the middle of the fixed frame 11 and supports the second group lens.
and a third group holding frame 16 that is fitted into the rear part of the rear group holding frame 15 and supports the third group lens.
and an interlocking mechanism 17 that rotationally and integrally connects the focus ring 14 and the third group holding frame 16.

The zoom ring 12 is fitted onto the outer periphery of the fixed frame 11 so that it can rotate but cannot move forward or backward in the direction of the optical axis. Two cam elongated holes 12a and 12b are formed which form the shape of a letter "V" when viewed horizontally. In the cam elongated holes 12a and 12b, there are guide elongated holes 11a and 12b formed in the fixed frame 11 in the optical axis direction.
Cam pins 18 and 19, which are set up in the front group holding frame 13 and the rear group holding frame 15, are respectively fitted through the cam pins 11b. The focus ring 14 is formed of a double cylinder in which a large-diameter cylinder part and a small-diameter cylinder part are concentrically integrated by the front wall. A helicoid screw 14a is screwed into a helicoid screw 13a carved on the inner peripheral surface of the front group holding frame 13. and,
The large-diameter cylindrical portion covers the front part of the zoom ring 12 at its outer periphery and forms an operating section for focusing, and the front group lens is fitted and held on the inner peripheral surface of the small-diameter cylindrical portion. .

Further, one end of a driving arm interlocking member 17a forming the interlocking mechanism 17 is fixed to the rear end surface of the small diameter cylindrical portion of the focus ring 14 by means not shown. This drive link member 17a is
As shown in FIGS. 4 and 5, it is formed of a band-shaped plate whose other end is shaped like a fork,
In the intermediate long groove of the fork-shaped part, there is a connecting pin 1 which is caulked to one end of the driven arm interlocking member 17b.
7c is inserted. Driven side interlocking member 17
b is also formed of a band-shaped plate, and the other end is
It passes through an arc-shaped play slot 15a drilled in the intermediate wall of the rear group holding frame 15, is planted in the third group holding frame 16, and is drilled in the small cylindrical portion of the rear group holding frame 15. It is fixed to the head of the cam pin 20 passing through the cam elongated hole 15b by means not shown.

The rear group holding frame 15 is formed of a double cylindrical body in which a large-diameter cylindrical portion and a small-diameter cylindrical portion are integrated by an intermediate wall, and the cam pin 19 is attached to the outer peripheral surface of the large-diameter cylindrical portion. It is set up in the middle, and a second group lens is fitted and held at the front part of the small diameter cylindrical part.
Further, a third group holding frame 16 for fitting and holding the third group lens is fitted to the rear side of the small diameter cylindrical portion.
The cam elongated hole 1 of the rear group holding frame 15 into which the cam pin 20 planted on the outer peripheral surface of the third group holding frame 16 is fitted.
5b, as shown in FIG. 6, has a curved shape gently inclined with respect to the circumferential direction, and by moving the third group lens along the cam elongated hole 15b, This serves to correct the aberrations caused by the aberration.

As described above, the zoom lens barrel of this embodiment is configured.

Next, the operation of this zoom lens barrel will be explained.

First, when the zoom ring 12 is rotated, the action of the cam elongated holes 12a and 12b causes the cam pins 18 and 19 to move toward the guide elongated hole 11 when turning to the right when viewed from the front.
They move toward each other in the optical axis direction while being guided by a and 11b. This reduces the distance between the front group lens and the rear group lens, and increases the focal length of the zoom lens barrel. Also,
When the zoom ring 12 is rotated to the left when viewed from the front,
Due to the action of the cam elongated holes 12a, 12b, the cam pins 18, 19 move away from each other in the optical axis direction while being guided by the guide elongated holes 11a, 11b. As a result, the distance between the front group lens and the rear group lens increases, and the focal length of the zoom lens barrel becomes smaller. Therefore, when the zoom ring 12 is rotated, zooming is performed.

On the other hand, when the focus ring 14 is rotated, the helicoid screws 14a, 13
Due to the action of a, when turning to the right when viewed from the front, the lens rotates while retreating in the optical axis direction, for example. For this reason, the front group lens is retracted, and the object point distance in the in-focus state gradually becomes farther away. Also, at the same time,
As the focus ring 14 rotates, the driving arm interlocking member 17a is rotated, and the driven arm interlocking member 17b is also rotated via the connecting pin 17c. Then,
The cam pin 20 moves within the cam elongated hole 15b, and the third
The group lens rotates and retreats in the optical axis direction.
This movement of the third lens group corrects aberrations caused by the retraction of the front lens group. Further, when the focus ring 14 is rotated to the left when viewed from the front, the focus ring 14 rotates while moving forward in the optical axis direction, for example. For this reason, the front lens group is extended, and the object point distance in the focused state gradually becomes shorter. At the same time, due to the rotation of the focus ring 14, the driving arm interlocking member 17a, the connecting pin 17c, and the driven arm interlocking member 17b all rotate, and the cam pin 20 moves within the cam elongated hole 15b. The third group lens moves forward in the optical axis direction while rotating. Therefore, aberrations caused by the extension of the front lens group are corrected by movement of the third lens group. Note that the driving arm interlocking member 17a and the driven arm moving member 17b are connected to each other so that they can freely move in the optical axis direction.
Even if the amount of movement of the first group lens and the amount of movement of the third group lens during focusing are different, no problem occurs.

FIG. 7 shows a zoom lens barrel showing another embodiment of the present invention, in which the lens barrel of the embodiment shown in FIG. Whereas the holding frame 16 was arranged so as to be rotatable, the holding frame 16 is arranged so as not to be rotatable due to the arrangement position of the aperture, etc. That is,
The third group holding frame 16 is formed in the optical axis direction by fitting the cam pin 20 installed in the third group holding frame 16 into the guide elongated hole 15c formed in the rear group holding frame 15 in the optical axis direction. It is arranged so that it can slide but cannot rotate. The head of the cam pin 20 is a cam elongated hole 21a bored in a focus interlocking cam ring 21 which is arranged in the small diameter cylinder part of the rear group holding frame 15 so that it can rotate but cannot move forward or backward in the optical axis direction.
The other end of the driven gear interlocking member 17b is fixed to the focus interlocking cam ring 21.

Note that other members not specifically mentioned are constructed in the same way as the corresponding members in the lens barrel of the embodiment shown in FIG. The same applies to the lens barrels of each embodiment described later).

In the zoom lens barrel of this embodiment configured as described above, when the focus ring 14 is rotated for focusing, the focus interlocking cam ring 21 is rotated via the interlocking mechanism 17, and the cam elongated hole 21a is rotated. , the cam pin 20, and the guide elongated hole 15c, the third group holding frame 16 is moved forward and backward in the optical axis direction. Therefore, aberrations caused by movement of the front group lens are corrected by movement of the third group lens.

FIG. 8 shows still another embodiment of the present invention, in which the zoom lens barrel of this embodiment is different from the lens barrel of the embodiment shown in FIGS. 2 and 7 above due to focusing. Whereas only the third lens group was moved to correct aberrations, the second lens group and the third lens group are now moved independently. The rear group holding frame 15 in this zoom lens barrel is formed of a double barrel in which a large diameter barrel part and a small diameter head part are integrated at the front wall, and the inner peripheral surface of the small diameter barrel part is attached to the front surface of the inner circumferential surface of the small diameter barrel part. A second group holding frame 22 that holds a second group lens is fitted therein. A cam pin 23 is installed on the outer peripheral surface of the second group holding frame 22, and the cam pin 23 is fitted into a cam elongated hole 15d formed in the rear group holding frame 15. In addition, the head of the cam pin 23 has
A protrusion 23a for being driven is provided in a protruding manner, and this protrusion 23a is fitted into an elongated hole (not shown) in the optical axis direction formed in the driven arm interlocking member 17b. On the other hand, a helicoid screw 15e is carved on the rear side of the inner peripheral surface of the small diameter cylindrical portion of the rear group holding frame 15, and a helicoid screw 15e is carved on the outer peripheral surface of the third group holding frame 16. helicoid screw 1
6a are screwed together. The other end of the driven arm interlocking member 17b is once bent in the radial direction and then fixed to the rear end surface of the third group holding frame 16 by means not shown. Note that the front wall of the rear group holding frame 15 is provided with an elongated play hole 15f similar to the elongated play hole 15a (see FIGS. 2 and 7).

In the zoom lens barrel of this embodiment configured as described above, when the focus ring 14 is rotated for focusing, the drive arm interlocking member 17a rotates and the connecting pin 17c is rotated. The driven side interlocking member 17b is rotated through this. Then, the cam pin 23 is rotated through an elongated hole and a protrusion 23a (not shown), and the second group holding frame 22 rotates and moves back and forth in the optical axis direction due to the action of the cam elongated hole 15d. Further, due to the rotation of the driven side interlocking member 17b, the third group holding frame 16 moves forward and backward in the optical axis direction while rotating under the action of the helicoid screws 16a and 15e. Therefore, the aberration caused by the movement of the front group lens is
It is corrected by moving the lens group.

The zoom lens barrel of this embodiment can be applied only when the movement of the front group lens and the third group lens is linear, and the zoom lens barrel of this embodiment can be applied to a multi-type zoom lens barrel with two or more groups. It is extremely effective to employ an aberration correction mechanism similar to that of the lens barrel.

FIG. 9 shows another embodiment of the invention,
In the zoom lens barrel of this embodiment, the lens barrel of the embodiment shown in FIG.
While the group holding frame 16 was arranged so as to be rotatable, the holding frame 2
2 and 16 are arranged so that they cannot rotate. That is, the second group holding frame 22 and the third group holding frame 16 have cam pins 23 and 24 planted on their outer peripheral surfaces inside the guide elongated holes 15g and 15h drilled in the rear group holding frame 15 in the optical axis direction. It is fitted in the optical axis and is arranged so that it can slide in the optical axis direction but cannot rotate. The above cam pins 23 and 2
4 are located in elongated cam holes 25a and 25b formed in a focus interlocking cam ring 25, which is arranged in a small-diameter cylindrical portion of the rear group holding frame 15 so that it can rotate but cannot move forward or backward in the optical axis direction. The other end of the driven side interlocking member 17b is fixed to the focus interlocking cam ring 25.

In the zoom lens barrel of this embodiment configured as described above, when the focus ring 14 is rotated for focusing, the focus interlocking cam ring 25 is rotated via the interlocking mechanism 17, and the cam elongated hole 25a is rotated. , 25b, cam pin 23, 2
4. By the action of the guide slots 15g and 15h, the second group holding frame 22 and the third group holding frame 16 are moved back and forth in the optical axis direction independently of each other. Therefore, aberrations caused by movement of the front group lens are corrected by movement of the second group lens and the third group lens.

FIG. 10 shows still another embodiment of the present invention, in which the zoom lens barrel of this embodiment is different from the lens barrel of each of the embodiments already described in that the small diameter barrel portion of the focus ring 14 is able to generate driving force. While the driving force was transmitted to the aberration correction mechanism, the large-diameter cylindrical portion is now used to transmit the driving force. That is, the focus ring 14 in the zoom lens barrel of this embodiment
1 is an L-shaped interlocking member 1 in which a large-diameter cylindrical portion is formed into a long length and a band-shaped plate is bent on the rear end surface.
One end of 7d is fixed. This interlocking member 17
d passes in the radial direction through play holes 12c, 11c, and 15i in the circumferential direction, which are bored in the large-diameter cylinder portions of the zoom ring 12, the fixed frame 11, and the rear group holding frame 15, respectively, to hold the rear group. The frame 15 is bent toward the rear of the optical axis in the middle between the large-diameter cylindrical portion and the small-diameter cylindrical portion, and the other end, which is shaped like a fork, is connected to the cam pin 20.
It is engaged with a driven protrusion 20a protruding from the head of.

In the zoom lens barrel of this embodiment configured in this way, when the focus ring 14 is rotated for focusing, the cam pin 20 moves along the cam elongated hole 15b via the interlocking member 17d, and the third group The movement of the lens corrects aberrations caused by movement of the front group lens. Note that the fixing position of the interlocking member 17d and the installation location of the protrusion 20a can be set at the most advantageous location based on the frame structure of the zoom lens barrel, the movement of each lens group, etc.

FIG. 11 shows still another embodiment of the present invention, in which the zoom lens barrel of this embodiment has a zoom ring and a focus ring that are separately rotated in the lens barrel of each of the embodiments already described. In contrast to the two-ring type zoom lens barrel, which performs zooming and focusing using the same operating ring, it is a one-ring type zoom lens barrel, which performs zooming and focusing by sliding and rotating the same operating ring. be. That is, in the zoom lens barrel of this embodiment, the operating ring 30 is fitted so as to straddle the outer peripheral surfaces of the zoom ring 32 and the focus ring 34, and a hole is provided near the tip of the ring 30. Guide elongated hole 30 in the optical axis direction
A transmission pin 41 erected on the front outer peripheral surface of the focus ring 34 is fitted into the inside a (see FIG. 12). In addition, in the elongated hole 30b for rotation escape, which is bored in the circumferential direction in the middle of the operating ring 30, a guide in the optical axis direction is installed in the front group holding frame 33 and is bored in the fixed frame 31. The heads of the cam pins 38 are fitted through the long holes 31a and the long rotation holes 32a formed in the zoom ring 32 at an angle with respect to the optical axis direction (see FIG. 13). Further, the zoom ring 32 is provided with a cam elongated hole 32b that is gently inclined with respect to the circumferential direction, as shown in FIG.
The head of a cam pin 39 that passes through a guide elongated hole 31b in the optical axis direction formed in the fixed frame 31 is fitted inside.

Note that other members not specifically mentioned are constructed in the same way as the corresponding members in the lens barrel of the embodiment shown in FIG. Therefore, detailed explanation will be omitted.

In the zoom lens barrel of this embodiment configured in this way, when the operation ring 30 is slid along the optical axis direction, the cam pin 38 is pushed and moved by the side wall surface of the elongated hole 30b, and the guide elongated hole is moved. It advances and retreats in the optical axis direction while being guided by 31a. Then, the position of the cam pin 38 within the rotation elongated hole 32a changes, so the zoom ring 32 rotates accordingly, and the cam pin 39 rotates along the guide elongated hole 31b due to the action of the cam elongated hole 32b. Move forward and backward in the axial direction. Therefore, by moving the cam pins 38 and 39 together, the front group lens and the rear group lens,
move forward and backward in the optical axis direction with a predetermined relationship, and zooming is performed.

Moreover, when the operation ring 30 is rotated in the circumferential direction,
The focus ring 34 rotates via the transmission pin 41, and the front group lens rotates while moving back and forth in the optical axis direction by the action of the helicoid screws 34a and 33a. Focusing is thus performed. Furthermore, when the focus ring 34 rotates, the interlocking mechanism 3
The cam pin 40 rotates through the cam elongated hole 35.
The third group lens moves in the optical axis direction due to the action of b. Therefore, aberrations caused by focusing are corrected.

15 and 16 show other examples of the interlocking mechanism 17 shown in FIGS. 4 and 5 above. The interlocking mechanism 47 of this example does not use the connecting pin 17c (see FIGS. 4 and 5), but allows the fork-shaped portion of the driving arm interlocking member 47a and the driven arm interlocking member 47b to mutually slide. It is designed to allow direct occlusion freely.

It goes without saying that even if the interlocking mechanism 47 is configured in this way, the operation of the zoom lens barrel of the present invention will not change. Note that various other interlocking mechanisms that perform the same role have already been proposed, and it is of course possible to install the most suitable one from among these in terms of the mounting space, etc. be.

FIG. 17 shows still another example of a suitable interlocking mechanism applied to the zoom lens barrel of the present invention. This interlocking mechanism 57 includes a drive linking member 57
a is the focus ring 14, 34 (Fig. 2 and 1
(See Figure 1) is attached at a slight angle with respect to the optical axis direction, and the fork-shaped portion of the driving arm interlocking member 57a and the connecting pin 57c are attached during zooming.
By changing the engagement position with the driven arm interlocking member 57b, the driven arm interlocking member 57b is rotationally displaced in the circumferential direction, and the amount of aberration correction can be adjusted according to the focal length of the zoom lens barrel. . That is, the tilted driving arm interlocking member 57a and the connecting pin 57c
and the driven arm interlocking member 57b form a kind of cam mechanism, which displaces the initial position of the third group lens according to the focal length of the zoom lens barrel, and adjusts the amount of correction of aberrations during focusing. It was designed to change.

By applying the interlocking mechanism 57 having such a configuration, it becomes possible to more appropriately correct aberrations associated with focusing in the zoom lens barrel of the present invention.

FIG. 18 shows another example of the interlocking mechanism shown in FIG. 17 above for changing the aberration correction amount according to the focal length. The interlocking mechanism 67 of this example is
Interlocking member 67 formed similarly to the above-mentioned interlocking members 47a, 47b (see FIGS. 15 and 16)
a and 67b are fixed and interlocked with corresponding members so as to form the same inclination.

With the interlocking mechanism 67 of this example, the interlocking relationship between the driving arm interlocking member 67a and the driven arm interlocking member 67b changes with the zooming operation of the zoom lens barrel. The member 67b is rotationally displaced in the circumferential direction, and the position of the third lens group changes. Therefore, the amount of aberration correction is adjusted according to the focal length of the zoom lens barrel.

FIG. 19 shows still another example of the interlocking mechanism for changing the aberration correction amount according to the focal length. In the interlocking mechanism 77 of this example, whereas the adjustment of the aberration correction amount in the interlocking mechanisms 57 and 67 shown in FIG. 17 and FIG. An arc-shaped cam elongated hole 77a ₁ is bored, and a cam pin 77 is installed in the driven side interlocking member 77b in this cam elongated hole 77a ₁ .
By inserting the lens c, the amount of aberration correction can be changed non-linearly. That is, when the position of the cam pin 77c within the cam elongated hole _77a1 changes with the zooming operation of the zoom lens barrel, the driven side interlocking member 77b is rotationally displaced in the circumferential direction, and the third group lens is rotated. By changing the position, the amount of aberration correction changes depending on the focal length of the zoom lens barrel.

By using the interlocking mechanism 77 configured as in this example, aberrations associated with focusing of the zoom lens barrel can be minimized.

In addition, each interlocking mechanism 17, 37, 47,
57, 67 and 77, the driving side interlocking members 17a, 37a, 47a, 57a, 67a
and 77a, and the driven side interlocking members 17b, 3
It goes without saying that even if 7b, 47b, 57b, 67b and 77b are replaced, the same function will be achieved.

As described above, according to the present invention, in connection with the focusing operation of the zoom lens barrel, the focusing lens system is moved, and part or all of the other lens systems are moved, so that the object point Since the aberrations are corrected according to the distance, it is possible to provide a high-performance zoom lens barrel that has a large aperture, has little aberration, and is extremely convenient to use.

Note that in each of the above embodiments, the case where the zoom lens barrel is a two-group type is described;
It goes without saying that the present invention can be easily applied to a multi-group zoom lens barrel having more than one group.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the upper half of a zoom lens barrel showing an example of a conventional zoom lens barrel, FIG. 2 is a sectional view of the upper half of a zoom lens barrel showing an embodiment of the present invention, and FIG. 4th exploded view of the main parts showing the zooming cam mechanism in the zoom lens barrel shown in Fig. 2 above.
5 and 5 are an enlarged plan view and an enlarged perspective view of essential parts showing the interlocking mechanism in the zoom lens barrel shown in FIG. 2, and FIG. 6 is an enlarged perspective view of the zoom lens barrel shown in FIG. 2 above. FIGS. 7 to 10 are exploded views of the main parts showing the aberration correction cam mechanism in the barrel, and FIGS. FIG. 12 is a sectional view of the upper half of a zoom lens barrel showing another embodiment of the invention, and FIG. 13 is a developed view of the main parts showing the focusing transmission mechanism in the zoom lens barrel shown in FIG. 11 above. 14 is a developed view of the main parts showing the zooming transmission mechanism in the zoom lens barrel shown in FIG. 11 above, and FIG. 14 is a main part showing the zooming cam mechanism in the zoom lens barrel shown in FIG. 11 above. Developed view, Figure 15 and 1
6 is an enlarged plan view and an enlarged perspective view of essential parts showing another example of the interlocking mechanism shown in FIGS. 4 and 5 above, and FIGS. 17 to 19 are FIG. 6 is an enlarged plan view of a main part of still another example of the interlocking mechanism shown in FIG. 5; 11, 31... Fixed frame, 12, 32... Zoom ring, 12a, 12b, 32a, 32b... Cam slot, 13, 33... Front group holding frame, 14, 34...
Focus ring, 15, 35... Rear group holding frame, 15
b, 15d, 35b...Cam long hole, 16, 36...
...Third group holding frame, 17, 37, 47, 57, 6
7, 77... Interlocking mechanism, 17a, 37a, 47
a, 57a, 67a, 77a... Drive linkage member, 17b, 37b, 47b, 57b, 67b,
77b...Driven side interlocking member, 17c, 37
c, 57c, 77c...Connecting pin, 17d...Interlocking member, 18, 19, 20, 23, 24, 38,
39, 40...Cam pin, 21, 25...Focus interlocking cam ring, 21a, 25a, 25b...
...Cam slot, 22...Second group holding frame, 30...Operation ring, 41...Transmission pin,...Front group lens,
{...2nd group lens,...3rd group lens} Rear group lens.

Claims (1)

[Scope of Claims] 1. In a zoom lens barrel having at least a focusing lens group and a variable magnification lens group, the zoom lens barrel is guided in a straight line with respect to a fixed frame, and moves forward and backward only in the optical axis direction independently of each other in conjunction with the zoom operation. First and second lens holding frames move the focusing lens group and variable power lens group back and forth in the optical axis direction, and hold the focusing lens group, and move the optical axis in conjunction with the focusing operation. a focusing frame that is rotated around the circumference and is screwed or cam-coupled to the first lens holding frame so as to change the relative position in the optical axis direction with the first lens holding frame by the rotating operation; holding at least a portion of the variable power lens group;
A correction frame is screwed or cam-coupled to the second lens holding frame so as to change the relative position of the second lens holding frame in the optical axis direction by being rotated around the optical axis. , a rotation transmission mechanism that transmits only the rotation of the focusing frame to the correction frame, and a rotation transmission mechanism that moves the correction frame forward and backward in the optical axis direction by rotation of the focusing frame during a focusing operation. , a zoom lens barrel characterized by correcting aberrations.