CN107407820B - Lens barrels and optics - Google Patents

Abstract

A lens barrel and an associated optical apparatus having a reduced size are disclosed. The lens barrel includes a cylindrical fixed frame and a cylindrical movable frame. The cylindrical first frame includes an outer wall extending around the optical axis, and the cylindrical second frame is inserted into the first frame. The first frame includes a notch having first assembling portions at both side portions. The second frame includes a second assembly portion assembled to be fixed to the first assembly portion.

Description

Lens barrels and optics

technical field

Apparatus consistent with example embodiments relate to a lens barrel and optical apparatus.

Background technique

Recently, as the size of imaging devices such as cameras is reduced, the demand for small optical devices is increasing. An example of an optical device used as a component of a camera may be a so-called zoom lens, by which a user can freely change the focal length. The zoom lens may include a mechanism for moving the lens group and a mechanism for supporting and moving the movable group, which is usually arranged in the lens barrel. Specifically, the zoom lens may include a lens barrel (which may also be referred to as a zoom lens barrel or a zoom lens barrel), a fixed frame, and a movable frame, wherein the lens barrel includes a cam frame having a cam groove, and the fixed frame has A straight guide slot, the movable frame has a drive pin assembled to both the cam slot and the straight guide slot.

SUMMARY OF THE INVENTION

technical problem

Regarding the lens barrel, since the straight guide grooves in the fixed frame and the cam grooves in the cam frame are arranged to cross each other, and the drive pins of the movable frame are assembled to both the straight guide grooves and the cam grooves that cross each other, the drive pins need to be Have a certain size or more to ensure that the drive pin has enough strength to drive the cam frame and the fixed frame. Therefore, as the size of the drive pin increases, the width of the straight guide groove or cam groove must be increased. Therefore, additional space may be required at the outer wall of the fixed frame or cam frame.

Furthermore, the cylindrical outer wall including the straight guide groove, such as the fixed frame, may be integrated into a single element to ensure sufficient strength to prevent deformation of the straight guide groove when the lens barrel is dropped on the ground. In other words, if there is a cut portion formed by cutting a part of the outer wall in the lengthwise direction, it may be difficult for the lens barrel to have the necessary strength.

In addition, it is necessary to accommodate parts other than the straight guide grooves of the cylindrical outer wall. However, it may also be difficult to accommodate due to the reduced size of the lens barrel.

solution to the problem

Other aspects will be set forth in part in the following description, and in part will be apparent from the description, or may be learned by practice of the presented embodiments.

According to an aspect of the exemplary embodiments, there is provided a lens barrel including: a cylindrical fixed frame extending along an optical axis; and a cylindrical movable frame configured to move along the optical axis relative to the fixed frame. The cylindrical movable frame includes a cylindrical first frame and a cylindrical second frame, the notched first frame includes an outer wall extending about the optical axis, the second frame is configured to be inserted into the first frame, wherein the first frame includes the notches, The two side portions include a first assembly portion, and the second frame includes a second assembly portion configured to be assembled to be secured to the first assembly portion.

The lens barrel may further include: a first cam frame configured to rotate around the optical axis relative to the cylindrical fixed frame; and a cylindrical cam frame configured to rotate around the optical axis in conjunction with the rotation of the first cam frame and along the optical axis The optical axis moves, wherein the cylindrical first frame and the cylindrical second frame can move along the optical axis in combination with the rotation and movement of the cylindrical cam frame.

The lens barrel may further include: a manipulation ring configured to surround the optical axis by a user; and a zoom motor unit configured to drive the first cam frame to rotate according to a rotation amount of the manipulation ring.

Notches can accommodate certain components.

The hand shake compensation unit can be accommodated in the notch.

The first assembling unit may include an assembling groove extending along the optical axis, and the second assembling unit may include an assembling protrusion extending along the optical axis.

The lens barrel may further include a connecting portion configured to interconnect the portions of the notch.

A single lens or a plurality of lenses may be arranged at each of the first frame and the second frame.

According to an aspect of an exemplary embodiment, there is provided a lens barrel including: a cylindrical fixed frame extending along an optical axis; and a cylindrical movable frame configured to move along the optical axis relative to the cylindrical fixed frame. The cylindrical movable frame includes an outer wall extending around the optical axis, wherein the movable frame includes a gap including a first assembly portion on both sides, and the fixed frame includes a The second assembly part.

The lens barrel may further include a cylindrical cam frame configured to rotate about the optical axis relative to the cylindrical fixed frame, wherein the movable frame is configured to move along the optical axis in conjunction with the rotation of the cylindrical cam frame.

Notches can accommodate certain components.

The hand shake compensation unit can be accommodated in the notch.

The first assembling unit may include an assembling groove extending along the optical axis, and the second assembling unit may include an assembling protrusion extending along the optical axis.

According to an aspect of an exemplary embodiment, there is provided a lens barrel including: a cylindrical fixed frame extending along an optical axis; and a cylindrical movable frame configured to extend along the optical axis relative to the cylindrical fixed frame along the optical axis Moving along the optical axis, wherein the cylindrical movable frame includes a cylindrical first sub-frame, a second sub-frame and a third sub-frame, wherein the first sub-frame includes an outer wall extending around the optical axis, and the third sub-frame is arranged on the first sub-frame. A pair of spool supports between a sub-frame and a second sub-frame, the first sub-frame including a gap including a first assembly portion on both sides, and the second sub-frame including a pair of a pair of shaft holes into which the spool is inserted, and the third sub-frame includes a second assembly part configured to be assembled to be fixed to the first assembly part and a pair of connection parts, the pair of spools assembled to the pair of connecting parts.

The third sub-frame may include a first frame member disposed within the notch, and any one of the pair of connecting portions may be disposed at the first frame member.

The first assembling unit may include an assembling groove extending along the optical axis, and the second assembling unit may include an assembling protrusion extending along the optical axis.

The assembling protrusions may be arranged at both side end portions of the first frame member and slidably assembled to the assembling grooves.

A single lens or a plurality of lenses may be arranged at the third subframe.

The second sub-frame may include a second frame member disposed within the notch to overlap an outer peripheral surface of the first frame member, and the connecting portion disposed at the first frame member may be disposed at the outer peripheral surface of the first frame member and the spool may be arranged between the groove and the second frame member.

According to an aspect of the exemplary embodiments, there is provided an optical device including any one of the lens barrels.

beneficial effect

According to the exemplary embodiment, the space for accommodating movable parts can be reduced, and thus the size of the entire lens barrel and the optical device can be reduced. In addition, since the assembling between the first assembling unit and the second assembling unit can prevent separation of the notch, sufficient arrangement stability or impact resistance of the movable parts arranged at the notch can be ensured, and thus the movable parts can be prevented from moving Deformation or damage to parts.

Description of drawings

These and/or other aspects will be apparent and more readily understood from the following description of exemplary embodiments taken in conjunction with the accompanying drawings, in which:

1 is a cross-sectional view illustrating an internal structure of an interchangeable lens (optical device) according to an exemplary embodiment;

Figure 2 is a cross-sectional view taken along line A-A of Figure 1;

3 is an exploded perspective view of the lens barrel 2;

4 is a schematic diagram illustrating a lens barrel;

5 is a perspective view showing the internal structure of the fourth lens group movable frame (second frame);

6 is an exploded perspective view of a lens barrel according to an exemplary embodiment;

7 is a perspective view showing the internal structure of the fixing frame;

8 is a perspective view of a fifth lens group movable frame included in a lens barrel according to an exemplary embodiment;

Figure 9 is an exploded perspective view of the movable frame shown in Figure 8;

Figure 10 is a cross-sectional view of the movable frame shown in Figure 8;

FIG. 11 is a perspective view showing assembly of the first assembly part to the second assembly part; and

FIG. 12 is a cross-sectional view showing a portion of the movable frame shown in FIG. 10 in more detail.

Detailed ways

Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. In this regard, the presented embodiments may have different forms and should not be construed as limited to the descriptions set forth herein. Accordingly, the embodiments are merely described below, by referring to the figures, to explain various aspects.

Hereinafter, the lens barrel and the optical device according to the embodiments will be described in detail below with reference to assembly drawings. The optical apparatus according to the embodiment may include an imaging apparatus using an imaging apparatus such as a lens interchangeable system camera, a digital camera, a video camera, and a surveillance camera or an interchangeable lens used thereby. The lens barrel according to the embodiment may be included in an interchangeable lens used by an imaging apparatus.

1 is a cross-sectional view showing an internal structure of an interchangeable lens (optical device) according to an exemplary embodiment, and FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 . In FIGS. 1 and 2, reference numeral 1 denotes an interchangeable lens, and reference numeral C denotes an optical axis. As shown in FIG. 1 , the interchangeable lens 1 may include a lens barrel 2 in which a plurality of lens groups G1 to G6 are arranged along an optical axis C. As shown in FIG. The inner focus (IF) zoom lens can be realized by a plurality of lens groups G1 to G6 arranged in the lens barrel 2 .

The zoom lens may include a first lens group G1 , a second lens group G2 , a third lens group G3 , a fourth lens group G4 , a fifth lens group G5 and a third lens group G1 , a second lens group G2 , a fourth lens group G4 , a fifth lens group G5 , and a third lens group arranged in this order from the object side (the front side of the interchangeable lens 1 ). Six lens group G6. Each of the first to sixth lens groups G1 to G6 may include a single lens or a plurality of lenses.

For example, in the zoom lens, the zoom function can be realized by moving the first lens group G1 and the third lens group G3 to the sixth lens group G6 along the optical axis C, and the zoom function can be realized by moving the third lens group along the optical axis C G3 to achieve the focus function. Here, the second lens group G2 may be a fixed lens group that does not move. However, the configuration of the zoom lens according to the exemplary embodiment is not limited thereto. For example, the number of lenses or the combination of lenses may vary.

As shown in FIGS. 1 and 2 , in order to move the lens groups (particularly the fourth lens group G4 and the fifth lens group G5 ) in the zoom lens, the lens barrel 2 may include a lens barrel 2 that is arranged to be able to combine with the steering ring 3 around the optical axis C A rotating cylindrical first cam frame 4, a cylindrical fixed frame 5 arranged inside the first cam frame 4, a cylindrical second cam frame 6 arranged inside the fixed frame 5, a cylinder arranged inside the second cam frame 6 A fourth lens group movable frame (second frame) 7 and a fifth lens group movable frame 10 arranged inside the fourth lens group movable frame 7 and including the first frame 8 and the lens frame 9 are formed. In this exemplary embodiment, the first cam frame 4 and the second cam frame 6 may constitute the cam frame according to the exemplary embodiment, and the fourth lens group movable frame (second frame) 7 and the first frame 8 may A movable frame according to an exemplary embodiment is constituted.

The cylindrical operating ring 3 may be arranged on the outer peripheral surface at the rear side of the first cam frame 4 so as to be rotatable in clockwise and counterclockwise directions. In conjunction with the operation for rotating the manipulation unit including the manipulation ring 3 , the first cam frame 4 can be rotated in the direction in which the manipulation ring 3 rotates. FIG. 3 is an exploded perspective view of the lens barrel 2 . As shown in FIG. 3 , three cam frame straight guide grooves 11 extending along the optical axis C may be arranged at the outer wall of the first cam frame 4 . The cam frame straight guide grooves 11 may be arranged at different positions of the first cam frame 4 to divide the outer surface of the first cam frame 4 into three parts. The three parts of the divided outer surface are substantially equal and each correspond to an angle of 120 every 10°. Furthermore, three connecting pins 12 may be connected to the manipulation unit, such as the manipulation ring 3 , and may be arranged on the outer surface of the first cam frame 4 . In addition, the first cam frame 4 may further include a plurality of cam grooves.

The fixed frame 5 may be arranged to be fixed to another frame, and may be arranged so that the first cam frame 4 can rotate on the outer peripheral surface of the fixed frame 5 . The fixed frame 5 can be connected to the first cam frame 4 via the bayonet B1 as shown in FIG. 4 . Therefore, the first cam frame 4 cannot move relative to the fixed frame 5 along the optical axis C, but may be arranged to be rotatable around the optical axis C.

As shown in FIG. 3 , three fixed frame straight guide grooves 13 extending along the optical axis C may be arranged at the fixed frame 5 . Here, three fixed frame straight guide grooves 13 may be arranged on the cylindrical outer wall of the fixed frame 5 at different positions to divide the cylindrical outer wall of the fixed frame 5 into three substantially equal parts. Three fixed frame straight guide grooves 13 can be assembled to the second pins 14 of the fourth lens group movable frame 7 described below. Furthermore, in addition to the fixed frame straight guide grooves, three fixed frame cam grooves 15 extending around the optical axis C may be arranged on the outer wall of the fixed frame 5 . Here, the fixed frame cam grooves 15 may be arranged in the circumferential direction of the cylindrical outer wall of the fixed frame 5 to divide the cylindrical outer wall of the fixed frame 5 into three substantially equal parts.

Furthermore, the second cam frame 6 may be arranged to be movable along and rotatable about the optical axis C in the fixed frame 5 . In other words, the second cam frame 6 may be arranged to be helically movable relative to the fixed frame 5 . Three cam frame cam grooves 16 extending around the optical axis C may be arranged at the outer wall of the second cam frame 6 . In this exemplary embodiment, three cam frame cam grooves 16 may be arranged in the circumferential direction of the cylindrical outer wall of the second cam frame 6 to divide the cylindrical outer wall of the second cam frame 6 into three substantially equal part. Three cam frame cam grooves 16 can be assembled to the first pin 17 of the first frame 8 described below. Furthermore, three third pins 18 may be arranged at different positions of the cylindrical outer wall to divide the cylindrical outer wall of the second cam frame 6 into three substantially equal parts.

The third pin 18 may be movably assembled to both the cam frame straight guide groove 11 of the first cam frame 4 and the fixed frame cam groove 15 of the fixed frame 5 . Therefore, since the third pin 18 can be arranged to be assembled to both the cam frame straight guide groove 11 and the fixed frame cam groove 15 arranged to cross each other, the third pin 18 can be arranged to have a certain size or more than a certain size size to ensure that the third pin 18 has sufficient strength. Similar to the third pin 18, the first pin 17 and the second pin 14 according to the exemplary embodiment may also have a certain size or be larger than a certain size. As shown in FIGS. 1 and 2 , the fourth lens group movable frame 7 may be arranged inside the second cam frame 6 so as to be movable along the optical axis C. As shown in FIG. As shown in FIG. 1 , the toric portion 7 a may be arranged at the fourth lens group movable frame 7 in front of the interchangeable lens 1 . A cylindrical inner cylinder 7b may be arranged at an inner peripheral portion of the toric portion 7a. In this exemplary embodiment, the fourth lens group G4 including a plurality of lenses may be supported by the inner barrel 7b. Therefore, when the fourth lens group movable frame 7 moves linearly (forward or backward) along the optical axis C, the fourth lens group G4 can also move linearly (forward or backward) along the optical axis C.

As shown in FIG. 3, the fourth lens group movable frame 7 may include three second pins 14 protruding from the outer surface of the outer wall of the toric portion 7a, and the three second pins 14 may be arranged on the toric portion 7a where the outer wall is divided into three substantially equal parts. As shown in FIG. 4 , the second pin 14 may be movably assembled to the fixed frame straight guide groove 13 of the fixed frame 5 . As a result, the fourth lens group movable frame 7 can move linearly along the optical axis C relative to the fixed frame 5, but the fourth lens group movable frame 7 cannot rotate around the optical axis C. Furthermore, as shown in FIG. 3 , three movable frame straight guide grooves 19 extending along the optical axis C may be arranged at the outer wall of the fourth lens group movable frame 7 .

Furthermore, as shown in FIG. 4, the fourth lens group movable frame 7 may be connected to the second cam frame 6 via the bayonet B2. Therefore, the fourth lens group movable frame 7 cannot move along the optical axis C relative to the second cam frame 6 , but the fourth lens group movable frame 7 may be arranged to be rotatable around the optical axis C. Further, as shown in FIG. 5 , a pair of assembling protrusions (second assembling portions) 20 are arranged along the optical axis C between the inner surface of the toric portion 7 a and the inner surface of the fourth lens group movable frame 7 . The assembly protrusion 20 may be arranged to be assembled to an assembly groove (first assembly portion) 24 of the first frame 8 described below.

As shown in FIGS. 1 and 2 , the fifth lens group movable frame 10 including the first frame 8 and the cylindrical lens frame 9 may be arranged inside the fourth lens group movable frame 7 . As shown in FIG. 3 , the first frame 8 may include a notch 21 . Therefore, the outer wall of the first frame 8 may have a C-like shape. Furthermore, moving parts can be accommodated and arranged within the notches 21 .

Further, if the thickness of the components accommodated and arranged in the notch 21 is small in the direction parallel to the optical axis C, the two sides of the notch 21 can be connected to each other via the connecting portion at positions not disturbed by the components. For example, the notches 21 may be arranged in the longitudinal direction of the first frame 8 since the connecting portions having a certain thickness (eg, a small length in the direction parallel to the optical axis C) interconnect both sides of the notches 21 . Parts of the outer wall of the first frame 8 are interconnected in the longitudinal direction.

Furthermore, three first pins 17 may be arranged at the outer wall of the first frame 8, and the first pins 17 may be arranged at positions dividing the outer wall of the first frame 8 into three substantially equal parts. As shown in FIG. 4 , the first pin 17 may be movably assembled to the movable frame straight guide groove 19 arranged at the fourth lens group movable frame 7 and the cam frame cam groove 16 arranged at the second cam frame 6 both. Furthermore, a plurality of connecting pins 22 may be arranged at the first frame 8 close to the first pins 17 . A plurality of connection pins 22 may be inserted into the connection holes 23 of the lens frame 9, respectively.

Further, assembly grooves (first assembly units) 24 may be arranged along the optical axis C at both sides of the notch 21 arranged at the first frame 8 . As shown in FIG. 2 , a pair of assembling grooves 24 can be assembled to a pair of assembling protrusions 20 of the fourth lens group movable frame 7 as described above. The assembling protrusions 20 are assembled to the assembling grooves 24 arranged on both sides of the notch 21 . For example, the assembling protrusion can be slid into the assembling groove (first assembling unit) 24 . In this way, the two sides of the notch 21 can be prevented from being separated from each other due to an unexpected force applied thereto. In other words, even if the interchangeable lens 1 is accidentally dropped and an impact is applied, the assembling of the assembling protrusion 20 to the assembling groove 24 can prevent the separation of the notches 21, and thus can also prevent the assembling between the respective pins and grooves. deformed.

As shown in FIG. 1, the lens frame 9 is arranged at the rear of the first frame 8, and when the connecting pins 22 of the first frame 8 are inserted into the connecting holes 23 in the outer wall of the lens frame 9 as shown in FIG. 9 can be integrated with the first frame 8 . The fifth lens group G5 including a plurality of lenses may be supported by the lens frame 9 . Therefore, if the fifth lens group movable frame 10 moves linearly (forward or backward) along the optical axis C, the fifth lens group G5 can also move linearly (forward or backward) along the optical axis C.

Furthermore, as shown in FIGS. 2 and 3 , the hand shake compensation unit 25 may be assembled to the outer wall of the lens frame 9 . The camera shake compensation unit 25 is a movable member constituting a part of the moving group, and may protrude more than the outer peripheral surface of the lens frame 9 . Therefore, the hand shake compensation unit 25 can be accommodated and arranged in the notch 21 of the first frame 8 without disturbing the first frame 8 .

As mentioned above, since the camera shake compensation unit 25 protrudes more than the outer peripheral surface of the lens frame 9 , the first frame 8 generally needs to have a larger inner diameter to prevent the frame from interfering with the camera shake compensation unit 25 . However, since the first frame 8 according to the exemplary embodiment includes the notch 21 , the hand shake compensation unit 25 may be arranged within the notch 21 , and thus the inner diameter of the first frame 8 need not be larger than the outer diameter of the lens frame 9 . Therefore, the inner diameter of the first frame 8 may be almost the same as the outer diameter of the lens frame 9 . As a result, the size of the first frame 8 can be reduced.

In the above-described lens barrel 2 , each of the lens groups G1 and G3 to G6 can be moved forward or backward along the optical axis C according to the rotation of the steering ring 3 . In other words, if the manipulation ring 3 is rotated in one direction or the other, an electrical signal may be transmitted to the camera body, the zoom motor unit may be driven based on the manipulation amount of the manipulation ring 3, and the first cam frame 4 may be rotated .

For example, in the mechanical structure for moving the fourth lens group G4 and the fifth lens group G5 , the first cam frame 4 may be rotated according to the rotation of the manipulation ring 3 . Here, as shown in FIG. 4 , the first cam frame 4 may be arranged at the fixed frame 5 via the bayonet B1 so that the first cam frame 4 may not move linearly but may rotate. Further, since the third pins 18 assembled to the cam frame straight guide grooves 11 of the first cam frame 4 can be assembled to the fixed frame cam grooves 15 of the fixed frame 5, the second cam frame 6 including the third pins 18 can be relatively The fixed frame 5 rotates and moves linearly at the same time. In other words, the second cam frame 6 can move in the helical direction.

If the second cam frame 6 is moved in the helical direction, the rotation of the fourth lens group movable frame 7 connected to the second cam frame 6 via the bayonet B2 is restricted because the second pin 14 is assembled to the fixed frame 5 The fixed frame guides the groove 13 directly, and thus the fourth lens group movable frame 7 can move linearly relative to the fixed frame 5 . Therefore, the fourth lens group G4 mounted at the fourth lens group movable frame 7 can move linearly.

Further, if the second cam frame 6 is moved in the helical direction, the first frame 8 (the fifth lens group movable frame 10 ) including the first pins 17 assembled to the cam frame cam grooves 16 of the second cam frame 6 Rotation of the lens can be restricted because the first pin 17 is assembled to the movable frame straight guide groove 19 of the fourth lens group movable frame 7 , and thus the first frame 8 can be linearly moved relative to the fixed frame 5 . Therefore, the fifth lens group G5 arranged at the lens frame 9 included in the fifth lens group movable frame 10 can also move linearly.

Therefore, the zooming operation can be performed by rotating the first cam frame 4 by manipulating the manipulation ring 3 .

Since the lens barrel 2 according to the exemplary embodiment may include the notch 21 , the hand shake compensation unit 25 may be accommodated and arranged within the notch 21 . Therefore, the entire diameter of the lens barrel 2 can be reduced as much as the thickness of the outer wall of the first frame 8 . Furthermore, by using the lens barrel 2 according to the exemplary embodiment, the space for accommodating movable parts can be significantly increased, thereby saving space and reducing the size of the entire camera.

Further, since the first frame 8 includes the assembling grooves 24 arranged at both sides of the notch 21 and the fourth lens group movable frame (second frame) 7 includes the assembling protrusions 20 to be assembled to the assembling grooves 24, the Even if an unexpected force is applied, the two sides of the notch 21 can be prevented from being separated from each other. Therefore, the stability of the hand-shake compensation unit 25 disposed within the notch 21 is increased, and sufficient strength of the hand-shake compensation unit 25 against shock can be ensured. In addition, deformation or damage of the hand shake compensation unit 25 can be prevented, and deformation of the assembly between various pins and grooves can also be prevented.

Furthermore, in the interchangeable lens (optical device) 1 including the lens barrel 2 according to the exemplary embodiment, it is possible to save space by securing a space for accommodating the hand-shake compensation unit (internal part) 25 without additional expansion, so The size of the entire interchangeable lens 1 can be reduced. Furthermore, since the assembling groove 24 is assembled to the assembling protrusion 20, even if an unexpected force is applied, both sides of the notch 21 can be prevented from being separated from each other. Furthermore, it is possible to ensure the stability of the movable part arranged in the notch 21 and the sufficient strength of the movable part against impact. In addition, deformation or damage of movable parts can be prevented, and deformation of assembly between various pins and grooves can also be prevented.

Next, a lens barrel and an interchangeable lens (optical device) including the lens barrel according to exemplary embodiments will be described below.

In this exemplary embodiment, as described above, the interchangeable lens 1 may further include a lens barrel in which a plurality of lens groups are arranged along the optical axis, wherein the IF zoom lens may be composed of a plurality of lens groups arranged in the lens barrel to fulfill.

FIG. 6 is an exploded perspective view of a lens barrel according to an exemplary embodiment. In the lens barrel, reference numeral 30 denotes a cylindrical fixed frame, reference numeral 31 denotes a cylindrical cam frame into which the fixed frame 30 is inserted, and reference numeral 32 denotes a cylindrical movable frame inserted inside the fixed frame 30 . Furthermore, according to this exemplary embodiment, a single cam frame 31 is implemented, and the movable frame may be embodied by a single movable frame 32 . Furthermore, in this exemplary embodiment, the lens frame 9 shown in FIG. 3 may be integrated inside the movable frame 32 in the lens barrel.

The difference between the lens barrel according to the present embodiment and the lens barrel 2 according to the first embodiment is that since the movable frame 32 may be a single element, the first assembling unit (ie, the assembling groove arranged at the movable frame 32 33) is arranged to be assembled to the assembling protrusion 34 arranged at the fixing frame 30.

For example, in the lens barrel according to the present exemplary embodiment, the structure of the movable frame 32 is similar to that of the fourth lens group movable frame 7 shown in FIGS. 1 and 3 . In this exemplary embodiment, similar to the fourth lens group movable frame 7, the movable frame 32 may include a toric portion 32a on one side of the outer wall of the movable frame 32, and may include a toric portion 32a on the inner peripheral portion of the toric portion 7a A cylindrical inner barrel 32b is included. Further, since the lens group (lens frame 9) is supported inside the inner barrel 32b, when the movable frame 32 moves linearly (forward or backward), the supported lens group can move linearly (forward or backward) . The notches 35 may be arranged at the outer wall of the movable frame 32 . Therefore, the outer wall of the movable frame 32 may have a C-like shape due to the notch 35 . Similar to the notch 21 of the first frame 8 shown in FIG. 3 , the hand shake compensation unit 25 of the lens frame 9 shown in FIG. 3 can also be accommodated and arranged in the notch 35 .

The assembling grooves (first assembling units) 33 may be arranged along the optical axis C at both sides of the notch 35 arranged at the outer wall of the movable frame 32 . Further, as shown in FIG. 7 , a pair of assembling protrusions (second assembling units) 34 may be arranged along the optical axis C between the inner surface of the toric portion 30 a arranged at one side of the outer wall of the fixing frame 30 and the fixing frame 30 between the inner surfaces. The assembling protrusions 34 may be arranged to be assembled to the assembling grooves 33 of the movable frame 32 . As described above, since the assembling protrusions 34 are assembled to the assembling grooves 33 at both sides of the notch 35, even if an unexpected force is applied, the two sides of the notch 135 can be prevented from being separated from each other.

Furthermore, as shown in FIG. 6, three pins 36 may be arranged at the toric portion 32a of the movable frame 32 so as to protrude more than the outer peripheral surface of the outer wall of the movable frame 32, and the three pins 36 are located at the position where the movable frame 32 will move. Where the outer wall of the frame 32 is divided into three substantially equal parts. The pins 36 can be movably assembled to the cam grooves 37 of the cam frame 31 and can be movably assembled to the straight guide grooves 38 of the fixed frame 30 . Further, the cam grooves 37 and the straight guide grooves 38 may also be arranged at positions dividing the outer walls of the fixed frame 30 and the cam frame 31 into three substantially equal parts, respectively.

In the lens barrel according to this exemplary embodiment, similar to the lens barrel 2 shown in FIG. 1 , when the cam frame 31 rotates, the movable frame 32 can move forward or toward the optical axis C in conjunction with the rotation of the cam frame 31 . move after. In other words, if the cam frame 31 is rotated, the lens frame 9 arranged inside the movable frame 32 moves linearly with the movable frame 32 relative to the fixed frame 30, and thus the lens group supported by the lens frame 9 can also linearly move.

Since the lens barrel according to this exemplary embodiment may include the notch 35 (which is arranged to have a C-like lateral shape by removing a part of the outer wall of the movable frame 32 by an equal amount), the hand shake compensation unit 25 can accommodate and arranged in the notch 35 . Therefore, the entire diameter of the lens barrel can be reduced as much as the thickness of the outer wall of the movable frame 32 . Therefore, by using the lens barrel according to the present exemplary embodiment, it is possible to significantly increase the space for accommodating movable parts, thereby saving space and reducing the size of the entire camera.

Furthermore, since the assembling grooves 33 are arranged at both sides of the notch 35 arranged at the movable frame 32 and the assembling protrusions 34 to be assembled to the assembling grooves 33 are arranged at the fixed frame 30, even if an unexpected force is applied, The assembly of the assembly groove 33 to the assembly protrusion 34 can also prevent the two sides of the notch 35 from being separated. Therefore, the stability of the hand-shake compensation unit 25 disposed within the notch 35 and the sufficient strength of the hand-shake compensation unit 25 against shock caused by accidentally dropping the interchangeable lens can be ensured. In addition, deformation or damage of the hand shake compensation unit 25 can be prevented, and deformation of the assembly between various pins and grooves can also be prevented.

Furthermore, in the interchangeable lens (optical device) including the lens barrel according to the present exemplary embodiment, it is possible to save space by securing a space for accommodating the hand shake compensation unit (internal part) 25 without additional expansion, so it is possible to Reduce the size of the entire interchangeable lens. In addition, since the assembly groove 33 is assembled to the assembly protrusion 34, even if an unexpected force is applied, the two sides of the notch 35 can be prevented from being separated. Therefore, it is possible to ensure the stability of the movable member arranged in the notch 35 and the sufficient strength of the movable member against impact. As a result, deformation or damage of the movable parts can be prevented, and also deformation of the assembly between the various pins and grooves can be prevented.

Hereinafter, a lens barrel and an interchangeable lens (optical device) including the lens barrel according to exemplary embodiments will be described below. Similar to the interchangeable lens 1 shown in FIG. 1 , the interchangeable lens according to this exemplary embodiment may include a lens barrel in which a plurality of lens groups are arranged along the optical axis, wherein the IF zoom lens may be composed of lens elements arranged in the lens barrel. The plurality of lens groups are realized.

FIG. 8 is a perspective view of the fifth lens group movable frame 40 included in the lens barrel 2 according to the exemplary embodiment. FIG. 9 is an exploded perspective view of the fifth lens group movable frame 40 shown in FIG. 8 . FIG. 10 is a cross-sectional view of the fifth lens group movable frame 40 shown in FIG. 8 . In addition, for convenience of explanation, the following description of the same components as those of the interchangeable lens 1 and the lens barrel 2 will be omitted, and will be denoted by the same reference numerals.

Except that the interchangeable lens according to the third embodiment includes a fifth lens group movable frame 40 composed of a first subframe 41 , a second subframe 42 , a third subframe 43 and a lens frame 44 instead of the first frame The fifth lens group movable frame 10 composed of 8 and the lens frame 9 and arranged in the fourth lens group movable frame 7, the interchangeable lens according to the present exemplary embodiment and the interchangeable lens 1 including the lens barrel 2 same. Therefore, a detailed description of the components of the fifth lens group movable frame 40 will be given below.

As shown in FIGS. 8 to 10 , the fifth lens group movable frame 40 includes a cylindrical first sub-frame 41 , a cylindrical second sub-frame 42 , a space between the first sub-frame 41 and the second sub-frame 42 . An annular third subframe 43 supported by the bobbins 45a and 45b, and a cylindrical lens frame 44 arranged behind the second subframe 42. Further, the fifth lens group movable frame 40 may be arranged in the above-described fourth lens group movable frame 7 .

The first subframe 41 may include a notch 46 having a C-like shape. Furthermore, three first pins 17 may be arranged at the outer wall of the first subframe 41 , wherein the first pins 17 may be arranged at positions dividing the outer wall of the first subframe 41 into three substantially equal parts. The first pin 17 can be movably assembled to both the movable frame straight guide groove 19 arranged at the above-described fourth lens group movable frame 7 and the cam frame cam groove 16 arranged at the second cam frame 6 .

In addition, the first assembling parts 47 may be respectively arranged on both sides of the notch 46 . The pair of first assembling parts 47 may form assembling grooves extending along the optical axis C on both sides of the notch 46 .

The second sub-frame 42 may include a toric portion 42a arranged behind the interchangeable lens 1 and a cylindrical portion 42b arranged in front of the toric portion 42a. Additionally, the second subframe 42 may include a second frame member 48 that can be received and disposed within the indentation 46 . The second frame member 48 may be a part of the cylindrical portion 42b and may protrude forward corresponding to the shape of the notch 46 .

Further, a first protruding piece 48 a protruding inward in the radial direction may be arranged at the front end portion of the second frame piece 48 . Further, a second protruding piece 48b protruding inward in the radial direction may be arranged at a position of the cylindrical portion 42b opposite to the second frame piece 48 .

Shaft holes 49a and 49b into which the bobbins 45a and 45b are respectively inserted may be arranged at the protruding pieces 48a and 48b. Further, the shaft holes may be arranged at positions facing the toric portions 42a of the shaft holes 49a and 49b, respectively. The bobbins 45a and 45b can be inserted into the shaft holes 49a and 49b so that the bobbins 45a and 45b can be supported between the protrusions 48a and 48b and the toric portion 42a in a direction parallel to the optical axis C.

Since the second frame piece 48 arranged at the second subframe 42 is arranged in the notch 46 and the connecting pin 22 arranged at the outer wall of the first subframe 41 is inserted into the connection arranged at the outer wall of the second subframe 42 hole 23, so the first sub-frame 41 and the second sub-frame 42 can be assembled with each other.

The third subframe 43 may include a first frame member 50 that may be disposed within the indentation 46 . The first frame member 50 may protrude forward from the outer peripheral portion of the third sub-frame 43 corresponding to the shape of the notch 46 . The second frame member 48 may be disposed within the notch 46 while the second frame member 48 overlaps the outer peripheral surface of the first frame member 50 .

The third sub-frame 43 may include a pair of second assembling parts 51 assembled to the pair of first assembling parts (assembling grooves) 47 . The pair of second assembling parts 51 may include assembling protrusions extending along the optical axis C at both side end portions of the first frame member 50 .

As shown in FIGS. 11 and 12 , at the fifth lens group movable frame 40 , the second assembling parts (assembling protrusions) 51 on both sides of the first frame member 50 may be assembled to the cavities 46 at the notch 46 , respectively. The first assembly part (assembly groove) 47 of the two side parts. Further, at the fifth lens group movable frame 40 , the second assembling portion (assembling protrusion) 51 may be assembled so as to be slidable along the optical axis C in the first assembling portion (assembling groove) 47 . In addition, FIG. 11 is a perspective view showing the assembly of the first assembly portion (assembly groove) 47 to the second assembly portion (assembly protrusion) 51 . In addition, FIG. 12 is a cross-sectional view showing a part of the fifth lens group movable frame 40 shown in FIG. 10 in more detail.

As shown in FIGS. 8 to 12 , the third sub-frame 43 may include first and second connecting parts 52 a and 52 b for assembling the first and second spools 45 a and 45 b. The first connection part 52a may include a connection groove arranged on the outer peripheral surface of the first frame member 50 to extend along the optical axis C. As shown in FIG. The first spool 45a may be assembled between the first connecting portion (assembling groove) 52a and the second frame member 48 . The second connection part 52b may include a connection groove arranged on the outer peripheral surface of the third sub-frame 43 to extend along the optical axis C. As shown in FIG. The second spool 45b may be assembled between the second connecting portion (assembling groove) 52b and the second frame member 48 .

Therefore, the third subframe 43 can be moved along the optical axis C by using a pair of bobbins 45a and 45b arranged between the first subframe 41 and the second subframe 42 while the third subframe 43 supports the fifth lens group Some of the lenses included in the G5.

In addition, the third sub-frame 43 may be driven by the motor 53 to linearly move forward or backward. The motor 53 may be assembled to the second sub-frame 42 via screws 54 . In addition, the motor 53 may be arranged in the cutting portions 55a, 55b and 55c arranged at the first sub-frame 41, the second sub-frame 42 and the third sub-frame 43, respectively. The third sub-frame 43 may be assembled by a lead screw and a nut rotationally driven by the motor 53 . Therefore, the third sub-frame 43 can be driven straight forward or backward.

As shown in FIGS. 8 and 9 , the lens frame 44 may be inserted into the second sub-frame 42 from the rear of the second sub-frame 42 and integrated with the second sub-frame 42 while supporting the lens frame 44 included in the fifth lens group G5 other lenses in . Therefore, the first subframe 41 , the second subframe 42 , the third subframe 43 and the lens frame 44 may constitute the fifth lens group movable frame 40 . Therefore, if the fifth lens group movable frame 40 moves linearly (forward or backward) along the optical axis C, the fifth lens group G5 can also move linearly (forward or backward) along the optical axis C.

According to an exemplary embodiment, the first sub-frame 41 may include the notch 46, and thus the outer wall of the first sub-frame 41 may be arranged to have a C-like shape. Therefore, an accommodation space can be secured within the cutout 46 . Therefore, the entire diameter of the lens barrel 2 can be reduced as much as the thickness of the outer wall of the first sub-frame 41 .

In addition, the first sub-frame 41 may include first assembling parts (assembling grooves) 47 at both sides of the notch 46 , and the third sub-frame 43 may include second assembling parts ( Assembly protrusion) 51. Therefore, the assembly between the first assembly part 47 and the second assembly part 51 can maintain the distance between the two side parts to prevent narrowing due to unexpected force.

For example, if an unexpected shock is applied to the interchangeable lens 1, since the second assembly portion (assembly protrusion) 51 can be assembled to the first assembly portion (assembly groove) 47, the gap between the two sides of the notch 46 is maintained. distance between. As a result, deformation of the assembly between the various pins and slots can be prevented. Therefore, the components arranged within the notch 46 may have sufficient positional stability or shock resistance.

Further, in the fifth lens group movable frame 40 according to the present exemplary embodiment, the third sub-frame 43 may include the first frame member 50 disposed within the notch 46 , wherein the first connection portion 52a may be disposed in the first Frame member 50. Therefore, the first connection portion 52a can be arranged in the notch 46, thereby preventing the expansion of the entire diameter of the lens barrel 2. As shown in FIG.

In addition, the second subframe 42 may include a second frame member 48 assembled to the second subframe 42 to overlap the outer peripheral surface of the first frame member 50 and disposed within the notches 46 . The first connection part 52 a may be a connection groove arranged on the outer peripheral surface of the first frame member 50 , and the first bobbin 45 a may be arranged between the connection groove and the second frame member 48 . Therefore, even if the shaft hole for supporting the first bobbin 45 a is not arranged at the first frame member 50 , the first frame member 48 arranged between the connecting groove arranged on the outer peripheral surface of the first frame member 50 and the second frame member 48 The bobbin 45a can also be sufficiently supported so as to prevent the expansion of the entire diameter of the lens barrel 2 .

Although the embodiments of the inventive concept have been described above with reference to the assembly drawings, the inventive concept is not limited thereto. The shapes or combinations of components in the above-described embodiments are merely examples, and various modifications may be made according to design requirements without departing from the technical spirit of the inventive concept.

For example, although in the above-described exemplary embodiment, three pins or three grooves to be assembled are arranged at angular positions that divide the circumference around the optical axis C into three almost equal parts, the number of these pins or grooves Not limited to three. For example, the number of these pins or slots may be two or four or more. If the number of these pins or slots is not three, such pins or slots may be arranged at positions dividing the circumference into nearly equal parts of the same number.

Furthermore, although the first assembling unit includes the assembling groove and the second assembling unit includes the assembling protrusion in the above-described embodiment, the first assembling unit may include the assembling protrusion and the second assembling unit may include the assembling groove. Furthermore, the first and second assembling units are not limited to the assembling grooves and the assembling protrusions, as long as they have structures assembled with each other, but various assembling structures such as female assembling portions and male assembling portions may be employed.

Furthermore, although the first cam frame 4 or the cam frame 31 is arranged outside the fixed frame 5 or 30 in the above-described exemplary embodiment, the first cam frame 4 or the cam frame 31 may be arranged inside the fixed frame 5 or 30 .

It is to be understood that the exemplary embodiments described herein are to be regarded as illustrative and not restrictive. Descriptions of features or aspects in each exemplary embodiment should typically be considered as available for other similar features or aspects in other embodiments.

Although one or more embodiments have been described with reference to the accompanying drawings, workers of ordinary skill in the art will recognize that various changes in form and details may be made therein without departing from the spirit and scope as defined by the appended claims .

Claims (13)

1. A lens barrel, comprising:

a cylindrical fixed frame extending along an optical axis; and

a cylindrical movable frame configured to move along the optical axis with respect to the cylindrical fixed frame, the cylindrical movable frame including:

a cylindrical first frame including an outer wall extending about the optical axis; and

a cylindrical second frame configured to insert the cylindrical first frame into the cylindrical second frame,

wherein the cylindrical first frame includes a notch that forms an opening in the outer wall by cutting the outer wall in a lengthwise direction, and includes an assembly groove formed at each of both sides of the notch, and

wherein the cylindrical second frame includes an assembly protrusion configured to be inserted into the assembly groove.

2. The lens barrel according to claim 1, further comprising:

a first cam frame configured to rotate about the optical axis relative to the cylindrical fixed frame; and

a cylindrical cam frame configured to rotate about the optical axis in conjunction with rotation of the first cam frame and configured to move along the optical axis,

wherein the cylindrical first frame and the cylindrical second frame are further configured to move along the optical axis in conjunction with rotation and movement of the cylindrical cam frame.

3. The lens barrel according to claim 1, wherein the notch accommodates a specific part.

4. The lens barrel according to claim 3, wherein a handshake compensation unit is accommodated within the notch.

5. A lens barrel, comprising:

a cylindrical fixed frame extending along an optical axis; and

a cylindrical movable frame configured to move along the optical axis with respect to the cylindrical fixed frame, the cylindrical movable frame including:

an outer wall extending around the optical axis, the outer wall including a notch that forms an opening in the outer wall by cutting the outer wall in a lengthwise direction,

wherein the cylindrical movable frame further includes an assembly groove formed at each of both side portions of the notch, an

The fixing frame includes an assembly protrusion configured to be inserted into the assembly groove.

6. The lens barrel according to claim 5, further comprising:

a cylindrical cam frame configured to rotate about the optical axis relative to the cylindrical stationary frame,

wherein the movable frame is configured to move along the optical axis in conjunction with rotation of the cylindrical cam frame.

7. The lens barrel according to claim 5, wherein the notch accommodates a specific part.

8. The lens barrel according to claim 7, wherein a handshake compensation unit is accommodated within the notch.

9. A lens barrel, comprising:

a cylindrical fixed frame extending along an optical axis; and

a cylindrical movable frame configured to move along the optical axis with respect to the cylindrical fixed frame along the optical axis,

wherein the cylindrical movable frame comprises a cylindrical first sub-frame comprising an outer wall extending around the optical axis, a second sub-frame and a third sub-frame supported by a pair of bobbins arranged between the first sub-frame and the second sub-frame,

said first subframe comprises a notch cutting said outer wall in its longitudinal direction,

the notch comprises a first assembly portion at both side portions,

the second subframe includes a pair of shaft holes configured to allow the pair of bobbins to be inserted thereinto, and

the third subframe includes a second assembly portion configured to be assembled to be fixed to the first assembly portion, and a pair of connecting portions to which the pair of bobbins are assembled.

10. The lens barrel according to claim 9, wherein the third subframe includes a first frame member disposed within the notch, and either one of the pair of connecting portions is disposed at the first frame member.

11. The lens barrel according to claim 10, wherein the first assembling portion includes an assembling groove extending along the optical axis; and

the second assembling portion includes an assembling protrusion extending along the optical axis.

12. The lens barrel according to claim 11, wherein the assembling protrusions are disposed at both side ends of the first frame member, and are configured to be slidably assembled to the assembling grooves.

13. The lens barrel according to claim 10, wherein the second sub-frame includes a second frame member configured to be disposed within the notch so as to overlap with an outer peripheral surface of the first frame member,

the connecting portion arranged at the first frame member is a groove arranged in an outer peripheral surface of the first frame member, and

the spool is disposed between the groove and the second frame member.

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