WO2013073190A1

WO2013073190A1 - Lens barrel

Info

Publication number: WO2013073190A1
Application number: PCT/JP2012/007346
Authority: WO
Inventors: 岩崎　真一; 広康藤中
Original assignee: パナソニック株式会社
Priority date: 2011-11-17
Filing date: 2012-11-15
Publication date: 2013-05-23
Also published as: JP2015025827A

Abstract

　A lens barrel (1), wherein a zoom lens group (L4) is a lens group having variable power. A zoom motor (300) (zoom coil (301) and zoom magnet (302)) is arranged on the same side as a focus motor (800) (focus coil (801) and focus magnet (802)), with respect to a second optical axis (AX2).

Description

Lens barrel

The technology disclosed herein relates to a lens barrel provided with an optical system.

2. Description of the Related Art Conventionally, a lens barrel is known in which a first zoom lens group, a shutter unit, an image blur correction unit, a second zoom lens group, and a focus lens group are sequentially arranged between a reflecting member that reflects incident light and an image sensor. (See Patent Document 1).

Japanese Patent Laid-Open No. 9-15475

However, in the configuration of the lens barrel described in Patent Document 1, in order to drive the first and second zoom lens groups with a common actuator, a zoom drive shaft is disposed on the side of the shutter unit and the image blur correction unit. ing. For this reason, since the shutter unit and the image blur correction unit protrude to the side of the lens barrel, it is difficult to make the width of the lens barrel compact.

Therefore, the technology disclosed herein has been made in view of the above situation, and an object thereof is to provide a lens barrel that can be made compact in width.

The lens barrel disclosed herein includes a reflecting member, an image sensor, a zoom lens group, a zoom coil and a zoom magnet, a focus lens group, a focus coil and a focus magnet, a shutter unit, and an image blur correction unit. And. The reflecting member reflects light incident along the first optical axis along a second optical axis that is substantially orthogonal to the first optical axis. The zoom lens group is disposed on the imaging element side of the reflecting member and has a zooming action. The zoom coil and the zoom magnet drive the movement of the zoom lens group along the second optical axis. The focus lens group is disposed on the zoom lens group side of the image sensor and has a focus adjustment function. The focus coil and the focus magnet drive the movement of the focus lens group along the optical axis, and are disposed on the same side as the zoom coil and the zoom magnet with respect to the second optical axis when viewed from the first optical axis direction. The The shutter unit is disposed between the zoom lens group and the focus lens group, and controls shielding and passage of light to the image sensor. The image blur correction unit is disposed between the zoom lens group and the focus lens group, and includes an image blur correction lens group that corrects a blur of a formed image on the imaging element.

(The invention's effect)
According to the technology disclosed herein, it is possible to provide a lens barrel that can be made compact in width.

1 is an exploded perspective view of a lens barrel according to an embodiment of the present invention. Sectional drawing of the lens-barrel of FIG. FIG. 2 is a front perspective view of the lens barrel in FIG. 1.

[1. Lens barrel configuration]
FIG. 1 is an exploded perspective view of a lens barrel 1 according to the present embodiment. FIG. 2 is a cross-sectional view of the lens barrel 1 according to the present embodiment. FIG. 2 is a cross-sectional view of the lens barrel 1 taken along a plane including the first optical axis AX1 and the second optical axis AX2.

In the following description, the direction along the first optical axis AX1 is the “first direction”, the direction along the second optical axis AX2 orthogonal to the first optical axis AX1 is the “second direction”, and the first light. A direction orthogonal to the axis AX1 and the second optical axis AX2 is referred to as a “third direction”.

As shown in FIGS. 1 and 2, the lens barrel 1 includes a first group frame 100, a second group frame 200, a zoom motor 300, a shutter unit 400, an image blur correction unit 500, a fixed frame 600, a fourth group frame 700, a focus. A motor 800 and an image sensor 900 are provided.

The first group frame 100 holds a front lens group L1, a prism (reflecting member) L2, and a fixed lens L3.

The front lens group L1 has a first optical axis AX1.
The prism L2 bends the light beam incident from the first direction along the first optical axis AX1 in the second direction along the second optical axis AX2 orthogonal to the first optical axis AX1.

The second group frame 200 holds the zoom lens group L4 having a zooming action. The second group frame 200 is held movably in the second direction inside the first group frame 100.

The zoom lens group L4 is disposed on the imaging element 900 side of the prism L2. The zoom lens group L4 is the only lens group having a zooming action in the lens barrel 1.

The zoom motor 300 is attached to the side surface of the first group frame 100. The zoom motor 300 moves the second group frame 200 in the second direction inside the first group frame 100. The configuration of the zoom motor 300 will be described later.

The shutter unit 400 adjusts the amount of light hitting the image sensor 900 by controlling the shielding and passage of light toward the image sensor 900. The shutter unit 400 is disposed on the image sensor 900 side in the first group frame 100.

As shown in FIG. 1, the shutter unit 400 includes shutter blades 401, a shutter coil 402, and a shutter magnet 403. The shutter coil 402 and the shutter magnet 403 constitute an actuator that drives the shutter blade 401 to open and close.

The image blur correction unit 500 corrects the blur of the image formed on the image sensor 900. The image blur correction unit 500 is disposed on the image sensor 900 side of the shutter unit 400. The image blur correction unit 500 includes a movable frame 510 and a third group frame 520.

The movable frame 510 is disposed on the image sensor 900 side of the shutter unit 400 and holds the image blur correction lens L5. The movable frame 510 is supported by the third group frame 520 so as to be movable in a plane perpendicular to the second optical axis AX2.

The third group frame 520 is connected to the first group frame 100. The third group frame 520 is supported by the fixed frame 600.

Here, the movable frame 510 has a first correction magnet 511 and a second correction magnet 512, as shown in FIG. As illustrated in FIG. 1, the third group frame 520 includes a first correction coil 521 and a second correction coil 522.

The first correction magnet 511 and the first correction coil 521 constitute an actuator that drives the movable frame 510 in the first direction. The second correction magnet 512 and the second correction coil 522 constitute an actuator that drives the movable frame 510 in the third direction.

The fixed frame 600 supports the third group frame 520 on the prism L2 side. The fixed frame 600 holds the fourth group frame 700 so as to be slidable in the second direction. The fixed lens group L7 is fixed to the lower end of the fixed frame 600 (the end on the image sensor 900 side). A focus motor 800 is attached to the side surface of the fixed frame 600.

The fourth group frame 700 holds a focus lens group L6 having a focus adjusting function. The fourth group frame 700 is slidably held in the second direction inside the fixed frame 600. The fourth group frame 700 is disposed on the image sensor 900 side of the image blur correction lens L5. The fourth group frame 700 is driven by the focus motor 800.

The focus motor 800 is attached to the side surface of the fixed frame 600. A shield plate 810 is attached to the lower end surface of the focus motor 800.

The shield plate 810 is made of a high permeability material. The shield plate 810 shields the lines of magnetic force generated from the focus motor 800 from going to the image sensor 900. The configuration of the focus motor 800 will be described later.

The image sensor 900 is bonded and fixed to the sheet metal 910. The sheet metal 910 is fixed to the lower end portion of the fixed frame 600 with the shielding member 930 interposed therebetween. The image sensor 900 is electrically connected to the flexible printed circuit board 920.

[2. Internal arrangement of lens barrel]
Next, the internal arrangement of the lens barrel 1 will be described with reference to FIG. FIG. 3 is a front perspective view of the lens barrel 1 when the lens barrel 1 is viewed from the first direction.

The zoom motor 300 includes a zoom coil 301, a zoom magnet 302, and a zoom drive shaft 303.

The zoom coil 301 and the zoom magnet 302 constitute an actuator that drives the zoom lens group L4 along the zoom drive shaft 303.

The focus motor 800 includes a focus coil 801, a focus magnet 802, and a focus drive shaft 803.

The focus coil 801 and the focus magnet 802 constitute an actuator that drives the focus lens group L6 along the focus drive shaft 803.

Here, as shown in FIG. 3, the zoom motor 300 is disposed on the same side as the focus motor 800 with the second optical axis AX2 as a reference. That is, the zoom motor 300 and the focus motor 800 are collectively arranged on the right side of the optical system as viewed from the subject side in FIG. The zoom motor 300 is disposed substantially symmetrically with the focus motor 800 with the shutter unit 400 and the image blur correction unit 500 interposed therebetween.

Further, as shown in FIG. 3, the shutter coil 402 and the shutter magnet 403 are disposed on the same side as the zoom motor 300 and the focus motor 800 with the second optical axis AX2 as a reference. Further, the shutter coil 402 and the shutter magnet 403 are sandwiched between the zoom motor 300 and the focus motor 800 when viewed from the first direction.

As shown in FIG. 3, all actuators (including the motor) included in the lens barrel 1 are arranged at the first end opposite to the zoom coil 402 and the zoom magnet 403 of the front lens group L1 in the third direction. The first reference line S indicating the extended line is arranged on the same side with reference to the first reference line S. That is, all the actuators do not protrude outward from the first end of the front lens group L1, that is, the side surface of the first group frame 100 in the third direction.

Further, as shown in FIG. 3, the midpoints in the third direction of all the actuators provided in the lens barrel 1 are arranged on the same side with respect to the first reference line S.

Specifically, in the third direction, the first midpoint T1 of the pair of zoom coil 301 and zoom magnet 302, the second midpoint T2 of the pair of focus coil 801 and focus magnet 802, shutter coil 402 and shutter magnet. The third middle point T3 of the pair 403, the fourth middle point T4 of the pair of the first correction magnet 511 and the first correction coil 521, and the pair of the second correction magnet 512 and the second correction coil 522 The fifth middle point T5 is collectively arranged on the second optical axis AX2 side of the first reference line S.

Further, as shown in FIG. 3, all the actuators are arranged on the second optical axis AX2 side with respect to the second reference line V indicating the extension line of the outer end of the zoom motor 300 in the third direction. That is, all the actuators do not protrude outward from the outer end of the zoom motor 300, that is, the side surface of the lens barrel 1 in the third direction.

Further, as shown in FIG. 3, the first to fifth middle points T1 to T5 are arranged on the second optical axis AX2 side with respect to the second reference line V. That is, the first to fifth middle points T1 to T5 are collectively arranged on the second optical axis AX2 side of the second reference line V.

From the above, the first to fifth midpoints T1 to T5 of each actuator are disposed inside the both side surfaces of the lens barrel 1 in the third direction orthogonal to the first and second optical axes AX1 and AX2. The

Thus, it is possible to avoid the configuration in which each actuator protrudes from both side surfaces of the lens barrel 1, and to suppress an increase in dimension in the third direction.

[3. Summary]
(1)
In the lens barrel 1 according to the present embodiment, the zoom lens group L4 is the only lens group having a zooming action. The zoom motor 300 (zoom coil 301 and zoom magnet 302) is disposed on the same side as the focus motor 800 (focus coil 801 and focus magnet 802) with respect to the second optical axis AX2.

Therefore, as shown in FIG. 3, the shutter unit 400 and the image blur correction unit 500 can be interposed between the zoom motor 300 and the focus motor 800. As a result, the shutter unit 400 and the image blur correction unit 500 can be prevented from projecting to the side of the lens barrel 1 in the third direction, and the width of the lens barrel 1 can be made compact.

In addition, since such a lens barrel 1 can reduce the dimension in the third direction as described above, the third direction of the plurality of lens barrels 1 is provided even when the plurality of lens barrels 1 are mounted. The arrangement dimension in can be made smaller than before. Therefore, for example, in order to take a three-dimensional image / video, the present invention can be used particularly suitably in a compound eye type imaging apparatus equipped with two or more lens barrels.

(2)
In the lens barrel 1 of the present embodiment, the shutter coil 402 and the shutter magnet 403 are disposed on the same side as the zoom motor 300 and the focus motor 800 with respect to the second optical axis AX2, as shown in FIG. .

Therefore, by disposing the shutter coil 402 and the shutter magnet 403 between the zoom motor 300 and the focus motor 800, it is easy to suppress the shutter unit 400 from protruding from the side surface of the lens barrel 1. Therefore, the width of the lens barrel 1 in the third direction can be easily made compact.

(3)
In the lens barrel 1 of the present embodiment, the midpoints (T1 to T5) in the third direction of all the actuators are based on the first reference line S indicating the first end of the front lens group L1 in the third direction. Are located on the same side.

Therefore, it is easy to suppress the actuators of the shutter unit 400 and the image blur correction unit 500 from protruding from the side surface of the lens barrel 1. Therefore, the width of the lens barrel 1 in the third direction can be easily made compact.

(4)
In the lens barrel 1 of the present embodiment, the midpoints (T1 to T5) in the third direction of all the actuators are the second reference lines V indicating the extension lines of the outer ends of the zoom motor 300 in the third direction. It is arranged on the optical axis side.

Therefore, it is possible to suppress the actuators of the shutter unit 400 and the image blur correction unit 500 from protruding to the other side of the lens barrel 1. Therefore, the width of the lens barrel 1 in the third direction can be further reduced.

[4. Other Embodiments]
(A)
In the above embodiment, the image blur correction unit 500 is disposed on the image pickup device 900 side of the shutter unit 400, but is not limited thereto.

For example, the shutter unit 400 and the image blur correction unit 500 may be disposed between the zoom lens group L4 and the focus lens group L6, and the shutter unit 400 is disposed on the image sensor 900 side of the image blur correction unit 500. It may be.

(B)
In the above embodiment, the position of each actuator is shown in FIG. 3, but the position of each actuator is not limited to the position shown in FIG.

For example, the position of each actuator may be shifted from the position of FIG. 3 in the first to third directions.

However, even in this case, it is preferable that a large number of actuators are collectively arranged on the same side with respect to the second optical axis AX2.

According to the technique disclosed herein, a lens barrel that can be made compact in width can be provided, and can be applied to, for example, a camera, a mobile phone with a camera, a portable terminal with a camera, and the like.

1 lens barrel 100 first group frame 200 second group frame 300 zoom motor 301 zoom coil 302 zoom magnet 303 zoom drive shaft 400 shutter unit 401 shutter blade 402 shutter coil 403 shutter magnet 500 image blur correction unit 510 movable frame 511 for first correction Magnet 512 Second correction magnet 520 Third group frame 521 First correction coil 522 Second correction coil 600 Fixed frame 700 Fourth group frame 800 Focus motor 801 Focus coil 802 Focus magnet 803 Focus drive shaft 810 Shield plate 900 Imaging element 910 Sheet metal 920 Flexible printed circuit board 930 Shield member AX1 First optical axis AX2 Second optical axis L1 Front lens group L2 Prism (reflective member)
L3 Fixed lens L4 Zoom lens group L5 Image blur correction lens L6 Focus lens group L7 Fixed lens group S First reference line T1 to T5 First to fifth middle point V Second reference line

Claims

A reflecting member that reflects light incident along the first optical axis along a second optical axis substantially orthogonal to the first optical axis;
An image sensor;
A zoom lens group disposed on the imaging element side of the reflecting member and having a zooming action;
A zoom coil and a zoom magnet for driving movement of the zoom lens group along the second optical axis;
A focus lens group disposed on the zoom lens group side of the image sensor and having a focus adjusting action;
Drives the movement of the focus lens group along the optical axis, and is disposed on the same side as the zoom coil and the zoom magnet with respect to the second optical axis when viewed from the first optical axis direction. A focus coil and a focus magnet;
A shutter unit that is disposed between the zoom lens group and the focus lens group and controls shielding and passage of light to the image sensor;
An image blur correction unit that is disposed between the zoom lens group and the focus lens group and has an image blur correction lens group that corrects a blur of a formed image in the imaging element;
Lens barrel with
The shutter unit includes a shutter blade, and a shutter coil and a shutter magnet for driving an opening / closing operation of the shutter blade,
The shutter coil and the shutter magnet are disposed on the same side as the zoom coil, the zoom magnet, the focus coil, and the focus magnet with respect to the second optical axis when viewed from the first optical axis direction. ,
The lens barrel according to claim 1.
A front lens in which light incident along the first optical axis is incident before the reflecting member;
The image blur correction unit corresponds to an extension line corresponding to an extension of an end portion of the front lens group opposite to the zoom coil and the zoom magnet in a direction orthogonal to the first optical axis and the second optical axis. Having a correction coil and a correction magnet arranged closer to the zoom coil and the zoom magnet than one reference line;
The lens barrel according to claim 1 or 2.
The first midpoint of the zoom coil and zoom magnet pair and the second midpoint of the focus coil and focus magnet pair are both sides in a direction orthogonal to the first optical axis and the second optical axis. Arranged inside the surface,
The lens barrel according to any one of claims 1 to 3.
The shutter unit includes a shutter blade, and a shutter coil and a shutter magnet for driving an opening / closing operation of the shutter blade,
A third midpoint of the shutter coil and shutter magnet pair is disposed inside both side surfaces in a direction orthogonal to the first optical axis and the second optical axis.
The lens barrel according to any one of claims 1 to 4.
An image blur correction unit that corrects blur of a formed image in the image sensor;
The image blur correction unit includes first and second correction magnets and first and second correction coils,
The fourth midpoint of the first correction magnet and first correction coil pair and the fifth midpoint of the second correction magnet and second correction coil pair are the first optical axis and the It is arranged inside both side surfaces in the direction orthogonal to the second optical axis,
The lens barrel according to any one of claims 1 to 5.
The zoom lens group is provided as the only lens group having a zooming action,
The lens barrel according to any one of claims 1 to 6.