JP3419214B2 - Lens barrel - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel, and more particularly to a lens barrel provided with a vibration-proof optical system for preventing camera shake.

[0002]

2. Description of the Related Art When a camera vibrates during shooting, a so-called camera shake occurs, in which an image forming position shifts and an image flows. In order to prevent this camera shake, conventionally, various photographing lenses have been proposed that correct the image forming position according to vibration.

For example, Japanese Patent Laid-Open No. 7-191361 discloses an afocal lens 3 including two lenses 3a and 3b as a vibration-proof optical system 3 in front of the main photographing optical system 5, as shown in FIG. Photographic lens 1 is disclosed. In general, an afocal lens is a lens system that is composed of at least two lenses each having a power, and the constituent lenses cancel each other's power and the afocal lens as a whole does not have a power. In this photographing lens 1, one lens 3a is perpendicular to the optical axis S and the vertical direction V, and the other lens group 3b is perpendicular to the optical axis S according to the detected direction and magnitude of vibration. By moving in the horizontal direction and the horizontal direction H, the deviation of the image forming position is corrected.

However, the anti-vibration optical system 3 of this taking lens 1
The lens supporting means for movably supporting the lenses 3a and 3b in parallel includes an engaging portion with a guide rod extending in the tangential direction, and therefore becomes large in the radial direction and the outer diameter of the lens barrel becomes large. There is a problem.

[0005]

Therefore, the technical problem to be solved by the present invention is to drive the vibration-proof afocal lens by a method other than parallel driving and to make the lens supporting means as small as possible. An object of the present invention is to provide a lens barrel having a small size and a simple structure.

[0006]

In order to solve the above technical problems, the present invention provides a lens barrel having the following configuration.

The lens barrel is provided with a lens supporting means for holding each lens group of the image stabilizing afocal lens composed of at least two lens groups. Each of the lens supporting means is rotatably supported in a plane perpendicular to the optical axis about a point on the periphery of the lens barrel. Of the lens groups of the vibration-proof afocal lens, the lens supporting means that holds the lens group having the smallest effective light flux range is driven substantially along the long side direction of the effective light flux range. The effective luminous flux range refers to a cross section in the direction perpendicular to the optical axis of the effective optical path through which the effective luminous flux reaching the light receiving portion such as the film photosensitive surface inside the image frame or the light receiving surface of the CCD light receiving element passes. In general, the size of the effective light flux range differs depending on the position in the optical axis direction depending on the degree of narrowing or widening of the light flux, and therefore the size of the effective light flux range of each lens group for image stabilization also differs.

In the above structure, the lens group includes a case where it is composed of one lens. The first and second lens supporting means are typically lens frames that surround the entire circumference of the lens, but even if they are configured so as to surround a part of the outer circumference of the lens, for example, a part of the lens can be moved forward and backward in the optical axis direction. It may be configured to be held between. At least two lens supporting means are rotationally driven in a plane perpendicular to the optical axis. Since the lens supporting means for holding the lens group having the smallest effective light flux range is driven to rotate substantially in the long side direction of the effective light flux range, that is, the long side direction of the aperture, the held lens group has an arc shape in the long side direction. Move to. On the other hand, other lens support means
The lens group that is rotationally driven in the plane perpendicular to the optical axis moves in a circular arc shape, but the moving direction of the lens group is the lens group of the lens supporting unit that supports the lens group having the smallest effective light flux range. A direction different from the moving direction, preferably a direction substantially orthogonal to the moving direction. That is, the plurality of lens groups of the vibration isolating afocal lens move in the directions intersecting each other in the plane perpendicular to the optical axis. Therefore,
The image formation position can be corrected two-dimensionally. Since the lens support means is configured to be driven to rotate, a member such as a guide rod extending in the tangential direction is not required and the size can be further reduced as compared with the case of driving in parallel.

In the above structure, the lens supporting means for holding the lens group having the smallest effective light beam range is configured to move in the long side direction of the effective light beam range, so that the lens group itself to be held is made the smallest. be able to.

In brief, each lens group needs to cover the effective light flux range even if it moves, and therefore, it is necessary to make it larger than the area S of the effective light flux range.
The extraly increased area ΔS corresponds approximately to the product of the length of the effective luminous flux range in the direction perpendicular to the moving direction and the maximum moving distance. However, since the maximum movement distance is usually constant regardless of the movement direction, the area to be increased excessively Δ
S is minimum when it is the product of the short side of the effective light flux range and the maximum movement distance. Therefore, when the lens group having the smallest area S of the effective light flux range moves in the long side direction of the effective light flux range, the lens group itself becomes the smallest.

The lens supporting means can be made smallest when the lens group itself to be held is the smallest. Therefore, the lens supporting unit that holds the lens group having the smallest effective light flux range can be made the smallest by moving in the long side direction of the effective light flux range.

By utilizing the space around the smaller lens support means, for example, the drive mechanism of the lens support means, the position detection mechanism, etc. can be arranged more radially inward, so that the outer diameter of the lens barrel is reduced. It is possible to have smaller dimensions.

Therefore, the lens barrel having the above-mentioned structure has a small and simple structure by driving the afocal lens of the vibration-proof optical system by a method other than parallel driving and making the lens supporting means as small as possible. It is possible.

In the above structure, since the aperture is usually rectangular, the effective luminous flux range is also rectangular. for that reason,
When a lens having a circular cross section perpendicular to the optical axis is used as the vibration-proof afocal lens, the lens supporting means is moved to the outside of the effective light flux range along each side of the effective light flux range, including the case where the lens support means is moved. However, there is a portion where the effective luminous flux does not pass and is not effectively used. Although there are a plurality of these portions, each of which has an approximately D-shaped arcuate shape when viewed from the optical axis direction, and there are a plurality of these portions, they are not effectively used, and there is no problem even if they are eliminated.

Preferably, each of the at least one lens group and the lens frame member of the lens supporting means for supporting the at least one lens group is part of an outer shape of which a cross section perpendicular to the optical axis is substantially circular. It has a shape with a string.

In the above structure, at least one lens group of the vibration isolating afocal lens whose cross section perpendicular to the optical axis is usually circular, is cut into one or two or more substantially D-shaped arcuate portions to form a substantially circular shape. The cross-sectional shape has a chord in a part of its outer shape. That is, so-called D cut is performed.
As a result, the portion of the lens group that is not effectively used, that is, the substantially D-shaped arcuate portion through which the effective light flux does not pass can be removed, and the lens group itself can be made smaller. The lens support means surrounds the lens group with a lens frame member. Normally, for a lens frame member having a substantially circular optical axis orthogonal cross section, one or more generally D-shaped arcuate portions are cut in accordance with the cross-sectional shape of the lens group having chords, and a substantially circular outer shape is obtained. The cross-sectional shape has a part of the string. That is,
A so-called D cut is applied. Thereby, the lens frame member of the lens supporting means can be made small.

Therefore, the lens supporting means can be made smaller and the lens barrel can be miniaturized.

Preferably, each of the strings, which is a part of the outer shape of each of the at least one lens group and the lens frame member of the lens supporting means that supports the at least one lens group, is an effective light beam. It is formed along at least the long side direction of the range.

In the above structure, at least one lens group and the lens frame member of the lens supporting means for supporting the lens group are each cut into a substantially D-shaped arcuate portion along the long side of the effective light flux range. To do. In this way, the cutting area is larger than that in the case of cutting along the short side of the effective light flux range. Therefore, the lens support means, and hence the lens barrel, can be efficiently miniaturized.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION The lens barrel according to each embodiment of the present invention shown in FIGS. 1 to 21 will be described in detail below.

First, the lens barrel 10 according to the first embodiment of the present invention will be described with reference to FIGS.

As shown in the sectional views of FIGS. 1 to 4, the lens barrel 10 has a fixed portion 20 in which first and second moving portions 30 and 50 are housed in a nested manner. , A retractable zoom lens barrel which is adapted to appear in and out of the camera body, and which is a three-component main photographing optical system 12
And an image stabilization optical system 14 for correcting camera shake.

That is, the lens barrel 10 basically has a fixed portion 20, a first moving portion 30, and a second moving portion 5.
0, the focus block 70, and the third lens holder 8
0 from the retracted state of FIG. 1 to the wide end state of FIG. 2 to the tele end state of FIGS. 3 and 4 as shown by an arrow 99 from the camera body side to the subject side. ing.

The fixed portion 20 has a fixed barrel 22 fixed inside the body of the camera. On the inner peripheral surface of the fixed cylinder 22, a spiral lead 24 and three linear guide grooves 26 extending in the axial direction are formed.

The first moving portion 30 is the fixed barrel 2 of the fixed portion 20.
It is stored in 2 so that it can appear and disappear. The first moving portion 30 is a pair of plastic cylinders that are relatively movable in the axial direction and are relatively rotatable, and are a cam ring 32 and a rectilinear barrel 40.
Have. The straight-moving barrel 40 is arranged inside the cam ring 32. The outer peripheral surface of the cam ring 32 is covered with a first thin cylinder 39 which is a thin metal cylinder.

The cam ring 32 is provided with a lead engaging portion 34 which engages with the lead 24 of the fixed barrel 22 at the end portion of the outer peripheral surface of the cam ring 32 on the camera body side. When the cam ring 32 is rotated by a driving device (not shown), the fixed cylinder 22 of the fixed portion 20 is rotated.
It is adapted to move in the axial direction along the lead 24. The cam ring 32, as shown in the development view of FIG.
As shown by 8, the first, second
Also, three third cams 36, 37, 38 are formed. The first cam 36 and the second cam 37 are arranged side by side in the optical axis direction shown by the arrow 96, and the first cam 36 is located ahead of the second cam 37, that is, on the subject side, and has a large pressure angle. . The third cam 38 is arranged at an intermediate position of the pair of the first and second cams 36, 37, that is, at a position displaced in the circumferential direction, and the pressure angle of the third cam 38 is the same as that of the first cam 3.
It is smaller than the pressure angle of 6 and larger than the pressure angle of the second cam 37. As will be described later, each cam 36, 37, 38 has a forward movement barrel 52 of a second moving unit 50 for supporting the first, second and third lens groups 12a, 12b, 12c of the main photographing optical system 12 and a focus. The cam followers 58, 76, 84 of the block 70 and the third lens holder 80 are engaged with each other, and the lens barrel 10 is zoom-driven by the rotation of the cam ring 32.

By the way, the conventional cam ring 2 has the first, second and third cams 6, 7, 8 as shown in the development view of FIG.
Were aligned in the direction of the optical axis shown by arrow 96.
On the other hand, the cam ring 32 of the present embodiment has the same diameter as the conventional cam ring 2, but basically has the same shape as the cams 6, 7, 8 of the conventional cam ring 2, that is, the same pressure angle and length. Cam 3
By changing the arrangement of 6,37,38, it is shorter in the axial direction length than the conventional cam ring 2. That is, as shown in FIG. 6, when the rear end 32s of the cam ring 32 of the present embodiment on the camera body side and the rear end 2s of the conventional cam ring 2 are shown in alignment, the subject of the cam ring 32 of the present embodiment is shown. Side tip 32
Since t is set back from the tip 2t of the conventional cam ring 2 on the object side, the axial length of the cam ring 32 of the present embodiment is shortened by X.

By the way, in order to make the axial length shorter than the conventional cam ring 2 with the same diameter, instead of the third cam 8, the first or second cams 6, 7 are arranged so as to be displaced in the circumferential direction. It is also possible. However, when the first cam 6 is arranged so as to be displaced in the circumferential direction with respect to the second and third cams 7 and 8, as shown in the development view of FIG.
s approaches the first cam 6, and the width between both cams 6 and 7 becomes too narrow, and the strength of the cam ring 2y becomes insufficient. Also, the second cam 7
In the cam ring 2x in which is arranged in the circumferential direction with respect to the first and third cams 6 and 8, as shown in the development view of FIG.
The tip portion 7s of the second cam 7 interferes with the first cam 6. Further, when the first, second and third cams 6, 7, 8 are all arranged so as to be offset from each other in the circumferential direction, the respective cams 6, 7, 8 are arranged.
Will further interfere with each other. By changing the inclination of the cams so that they do not interfere with each other, it is possible to eliminate the interference and closeness of the cams, but this will increase the pressure angle and will require a large driving force to ensure smooth movement of the lens barrel. It becomes difficult to drive the zoom. Therefore, in order to have the same diameter as the conventional cam ring 2 and shorten it in the axial direction, each cam 36,
The configuration in which 37 and 38 are arranged is optimal.

The straight-moving barrel 40 is arranged close to the inner peripheral surface of the cam ring 32. As shown in the main part exploded perspective view of FIG. 5, the rectilinear barrel 40 has three guide arms 46 extending from the cylindrical portion 44 on the camera body side toward the subject in the axial direction. On the outer peripheral surface of the cylindrical portion 44, a straight-movement engaging portion 42 that slidably contacts the straight-movement guide groove 26 of the fixed barrel 22 is provided.
It is designed to be guided straight in the axial direction without rotating.

The outer peripheral surface of the first thin-walled cylinder 39 is exposed when the first moving portion 30 is extended from the fixed portion 20.

Inside the first moving unit 30, the second moving unit 50, the focus block 70, and the third lens holder 80 are housed in order from the subject side to the camera body side.

The second moving portion 50 is disposed so as to be retractable from the first moving portion 30, and has a forward cylinder 52 which is a plastic cylinder, and a second thin wall which is a metal cylinder that covers the outer peripheral surface of the forward cylinder 52. And a tube 59.

The forward cylinder 52, as shown in FIGS.
It has a substantially cylindrical shape, and a part of its peripheral wall 54 is curved inward in the radial direction and forms a guide groove 56 extending in the axial direction. In the guide groove 56, the rectilinear barrel 4 of the first moving unit 30 is inserted.
The guide arm 46 of 0 enters and is guided straight in the axial direction without rotating relative to the straight-moving barrel 40. The guide arm 46 of the straight advancing cylinder 40 is sandwiched between the peripheral wall 54 that forms the guide groove 56 of the advancing cylinder 52 and the second thin-walled cylinder 59 that covers the outer peripheral surface of the advancing cylinder 52. Also, movement in the circumferential direction is restricted. Therefore, even if the guide arm 46 receives a force in the circumferential direction, the guide arm 46 does not come off from the guide groove 56 because it is surrounded. Therefore, the radial dimension of the guide arm 46 can be made smaller and thinner.

Further, as shown in FIGS. 1 and 4, on the outer peripheral surface of the forward movement barrel 52 on the camera body side, as shown in FIGS. 1 and 4, a cam follower 58 which projects radially outwardly and engages with the first cam 36 of the cam ring 32.
Is provided. Since the forward rotation cylinder 52 is prevented from rotating relatively by the guide arm 46 of the straight movement cylinder 40, when the cam ring 32 is rotated, the cam follower 58 is moved in the axial direction by the first cam 36 of the cam ring 32, and the forward movement cylinder 52. Ie the second
The moving unit 50 is extended from the cam ring 32, that is, the first moving unit 30.

An intermediate wall 60 extending in the circumferential direction is provided inside the forward movement barrel 52 on the object side, and the first lens group 1 is provided.
It is designed to support 2a. A front wall 66 is provided at the subject side end of the forward movement barrel 52. Between the front wall 66 and the intermediate wall 60, the first and second lenses 14a and 14b of the image stabilizing optical system 14 are rotatable by the first and second lens frames 110a and 110b, which will be described in detail later. It is supported.

The outer peripheral surface of the second thin-walled cylinder 59 has the second moving portion 5
When 0 is paid out from the first moving portion 30, it is exposed to the appearance like the first thin-walled cylinder 39.

The focus block 70 supports the second lens group 12b of the main photographing optical system 12 inside the subject side of the main body 72 having a substantially cylindrical shape. The second lens group 12b is the focus unit 1 fixed to the main body 72.
6 (see FIG. 1) is moved in the axial direction to adjust the focus. Inside the main body 72, the second
A shutter unit 18 is housed closer to the camera body than the lens group 12b. The main body 72 has, on the camera body side of the shutter unit 18, three linear guide grooves 74 that penetrate the peripheral wall of the main body 72 and extend in the axial direction.

A flange portion 73 is provided on the camera body side of the main body 72. Although not shown in FIG. 5, the flange portion 73 is provided with three cam followers 76 projecting radially outward, as shown in FIG.
The cam follower 76 engages with the second cam 37 of the cam ring 32. Further, a straight guide groove 75 penetrating in the axial direction is formed in the flange portion 73 as shown in FIG.
The linear movement tube 40 is guided by the engagement with the guide arm 46. Therefore, when the cam ring 32 rotates relative to the rectilinear barrel 40, the cam follower 76 is moved by the second cam 37 of the cam ring 32 and the focus block 70 is cam-fed.

The third lens holder 80 is arranged closer to the camera body than the focus block 70. The third lens holder 80 includes a substantially cylindrical main body 82 that supports the third lens group 12c, and three cam followers 84 that project radially outward from the outer peripheral surface of the main body 82. Each cam follower 84 penetrates while slidingly contacting the straight guide groove 74 of the focus block 70, and engages with the third cam 38 of the cam ring 32. The cam ring 32 is the straight advance cylinder 40.
When rotated relative to the cam follower 84, the cam follower 84 is moved by the third cam 38 of the cam ring 32 while being linearly guided by the linear guide groove 74 of the focus block 70.
The third lens holder 80 is adapted to be cam-fed. The straight guide groove that guides the cam follower 84 of the third lens holder 80 straightly is formed in the focus block 70.
It may be provided on the advancing cylinder 52 instead of on the. In addition, the straight guide groove for guiding the cam follower 84 of the third lens holder 80 straightly is formed in the forward movement barrel 52 and the focus block 70.
It may be provided, respectively Re both Niso with. In this case, the rectilinear guide groove of the advancing cylinder 52 restricts the relative rotation of the third lens holder 80 in one direction, and the rectilinear guide groove of the focus block 70 restricts the relative rotation of the third lens holder 80 in the other direction. It is possible to configure the third lens holder 80 to be guided straight by both straight guide grooves.

As described above, this lens barrel 10
When the cam ring 32 is rotated by a drive device (not shown), the first and second moving parts 30 and 50 are extended, and the three components of the main photographing optical system 12 housed inside the lens barrel 10 are The lens groups 12a, 12b, 12c are cam-fed in the axial direction to be zoom-driven. That is, when the cam ring 32 is rotated, the lens barrel 10 is extended from the retracted state (see FIG. 1) to the wide end state (see FIG. 2). That is, the advancing barrel 52 of the second moving unit 50, the focus block 70, and the cam followers 58, 76, 84 of the third lens holder 80 become the wide end positions 36a, 37a, 38a shown by the alternate long and short dash line in FIG. When the cam ring 32 is further rotated from this wide end state, the cam followers 58, 76 and 84 are moved to the respective cam 3
Tele end position 3 indicated by the alternate long and short dash line along 6, 37, 38
6b, 37b, 38b, the lens barrel 10 is in the tele end state (see FIGS. 3 and 4).

Next, the vibration-proof optical system 1 of this lens barrel 10 is used.
4 will be described with reference to FIGS. 9 to 15.

As already described, the vibration-proof optical system 14 is composed of the first and second lenses 14a and 14b, and is located at the end of the second moving section 50 on the object side of the advancing barrel 52, that is, the main photographing optical system 12. It is placed closer to the subject than the subject.

The first and second lenses 14a and 14b are afocal lenses, and cancel out the power of the other one, so that the image stabilizing optical system 14 as a whole has no power. The first and second lenses 14a and 14b of the image stabilizing optical system 14 are substantially orthogonal to each other in the direction perpendicular to the optical axis without moving in the optical axis direction in order to correct the shift of the image forming position due to camera shake. It is designed to be rotated in the direction. That is, when a camera shake, that is, a vibration is detected by a detection unit (not shown) such as a gyro sensor, the deviation of the imaging position due to the camera shake, that is, the position fluctuation is predicted, and the position fluctuation is canceled out, that is, there is the camera shake. Also the first and / or second lenses 14a, 14b so that the image is formed at the same position or in the vicinity of the image frame.
By controlling the position of, it is possible to reduce the influence of camera shake by keeping the fluctuation of the image forming position during exposure within a certain range that is acceptable as a photograph without causing a focus shift. .

Since the image stabilizing optical system 14 is an afocal lens arranged closer to the subject than the main photographing optical system 12,
Compared with the case where a part of the lenses of the main photographing optical system 12 is moved or the afocal vibration-proof optical system is arranged at an intermediate position of the main photographing optical system 12, the first and / or second lenses 14a, 14b Movement has little effect on optical performance,
Lens design is easy. Further, since the movement amount of the first and second lenses 14a and 14b, that is, the control amount does not become too small, the position control of the first and second lenses 14a and 14b is easy.

The specific structure of the image stabilizing optical system 14 will be described below.

First and second lenses 1 of the image stabilizing optical system 14
4a and 14b are shown in FIG. 1 when viewed in the optical axis direction from the subject side.
As shown in the front view of the assembly of No. 0 (showing the front wall 66 of the forward movement tube 52 in a see-through manner) and the front views of the main parts of FIGS.
It is supported by the first and second lens frames 110a and 110b, respectively. As shown in the cross-sectional views of the main parts of FIGS. 10 and 13, the first lens frame 110a is arranged closer to the subject than the second lens frame 110b. The first and second lens frames 110a,
110b is arranged between the front wall 66 and the intermediate wall 60 of the advancing barrel 52 extending in the direction perpendicular to the optical axis, and is rotatably supported by the support shafts 120a and 120b arranged parallel to the optical axis.

First and second lens frames 110a and 110b
As shown in FIGS. 11 and 12, are provided at positions substantially opposite to the frame main bodies 112a and 112b surrounding the first and second lenses 14a and 14b and the first and second lenses 14a and 14b, that is, the optical axis. Shaft support 114a, 114b
And input units 116a and 116b.

The frame main bodies 112a and 112b are configured to have a certain width or more along the outer shapes of the first and second lenses 14a and 14b. The first and second lenses 14a,
Although 14b is originally circular, as shown in FIGS. 10 to 12, the first lens 14a has its upper part and the second lens 14b has its upper part in order to secure a space in the lens barrel 10. The lower part and the lower part are each cut into a substantially D-shape, and the cross section perpendicular to the optical axis is a part of the outer shape of a substantially circular string 1
The shape has 4s, 14t, and 14u. Correspondingly, the first and second lens frames 110a and 110b also have an outer shape that is cut into a substantially D shape, and the cross section perpendicular to the optical axis has a substantially circular outer shape and part of the outer shape has chords 112s and 112t. Has become. Slits (not shown) penetrating in the optical axis direction are formed at appropriate positions of the frame bodies 112a and 112b, and the light emitting element, that is, the LED 102 is fixed to the subject side so as to face the slits. On the other hand, the lens barrel 1
A position detection element 104 that receives the slit transmitted light from the LED 102 is fixed to the 0 forward cylinder 52 at a position facing the slits of the frame bodies 112a and 112b.

First and second lens frames 110a and 110b
13, as shown in FIG.
In the shaft holes 115a and 115b of the first and second support shafts 120.
The a and 120b are respectively inserted and rotatably supported. As shown in FIGS. 10 and 11, when viewed in the optical axis direction from the subject side, since the first support shaft 120a is fixed to the right side of the optical axis, the first lens frame 110a is fixed to the first support shaft 12a.
It is designed to oscillate about 0a in an arc in a direction substantially vertical to the body of the camera, that is, in the vertical direction. Further, as shown in FIGS. 10 and 12, the second support shaft 120b is fixed to the upper side of the optical axis.
Is oscillated about the second support shaft 120b in an arc shape in a substantially horizontal direction, that is, a horizontal direction with respect to the camera body.

First and second lens frames 110a and 110b
Although it is possible to configure the combination of the swinging directions substantially orthogonal to the above-mentioned configuration in the opposite manner to the above, as can be seen from the schematic view of the lens frame in FIG. The lens frame 110b can be made the smallest.

That is, FIG. 9A is a schematic view seen from the optical axis direction when the first lens frame 92a on the subject side is swung in the left-right direction and the second lens frame 94a on the camera body side is swung in the vertical direction. FIG. 9B is a schematic view seen from the optical axis direction when the first lens frame 92b is vertically swung and the second lens frame 94b is horizontally swung. 9A and 9B, both the first lens frame 92a on the subject side,
The size of the effective light flux range 90s at the position of 92b is the same, and the size of the effective light flux range 90t at the positions of the second lens frames 94a and 94b on the camera body side is the same. The effective luminous flux ranges 90s and 90t are cross sections of the effective optical path through which the luminous flux reaching the image frame passes, and the subject side 90s is larger than the camera body side 90t. Further, the distances and swing angles of the rotation centers 91x and 91y of the first and second lens frames 92a, 92b, 94a, and 94b from the optical axis 91c, the lens opening 93,
Lens frames 92a, 92b, 94 from a, 93b, 95a, 95b
The widths of a and 94b are the same. Under the above conditions, FIG.
Within a certain swing range, the lens openings 93a, 93b, 95a, 9
First, 5b covers the effective luminous flux range 90s, 90t.
2A and 2B schematically show a case where the second lens frames 92a, 92b, 94a, 94b are configured.

Comparing FIGS. 9A and 9B, FIG.
The second lens frame 94b shown in (B) is smaller than the second lens frame 94a shown in FIG. 9 (A). As for the lens frame 94b, it is understood that it is time to swing the second lens frame 94b in the long side direction of the effective light flux range 90t. This is schematically explained as follows.

That is, the lens frame needs to be made larger than the area S required to cover the effective light flux range in a stationary state by the amount of swinging. The area S of the lens frame required to cover the effective luminous flux in a stationary state becomes smaller as the effective luminous flux range itself becomes smaller. Further, the area ΔS of the lens frame which needs to be increased excessively is approximately the product W × L of the one-amplitude distance W in the swing direction and the length L of the effective light beam range in the direction perpendicular to the swing direction. equal. However, the one-amplitude distance W in the swing direction is substantially constant as long as the swing angle is the same, and the length L of the effective light flux range has the shortest side. Therefore, when both S and ΔS are the smallest, that is, when the lens frame having the smaller effective light flux range is swung in the long side direction of the effective light flux, the area of the lens frame is the smallest.

If the second lens frame 110b is configured to be the smallest as described above, while securing a space around the second lens frame 110b for arranging the drive system and the detection system of the first lens frame 110a, The lens barrel 10 can be downsized as a whole.

The input sections 116a and 116b are shown in FIGS.
As shown in FIG. 3, it partially protrudes radially outward from the frame bodies 112a and 112b. Radial side surfaces 118a, 119a; 118b, 11 on both sides in the circumferential direction of the input portions 116a, 116b.
9b, facing the forward cylinder 52 to the contact surfaces 68a,
69a; 68b, 69b are formed, and the first and second
The swing range of the lens frames 110a and 110b is restricted. Input unit 116a of the first lens frame 110a
Has an internal gear 117a on its camera body side,
The input part 116b of the lens frame 110b has an external gear 117b on its outer peripheral surface. Each gear 1 of the input parts 116a and 116b
Drive gears 136 mesh with 17a and 117b, respectively, so that the first and second lens frames 110a and 110b are driven to rotate about the first and second support shafts 120a and 120b.

The drive gear 136, as shown in FIG.
It is directly fixed to an output shaft 134 of a drive motor 130 which is arranged at a substantially equal distance from the optical axis and parallel to the optical axis, and is driven without a reduction gear. Therefore, there is no delay in rotation transmission due to rattle of the reduction gear.

Next, the first and second lens frames 110a, 1a
The support structure of 10b will be described.

As shown in FIG. 13, the support shafts 120a and 120b are provided with shaft support portions 114a and 114a of the lens frames 110a and 110b.
The torsion coil spring 12 is provided adjacent to 114b on the subject side.
4 and the washer 122 are inserted, and the lens frames 110a, 1
10b is attached while being urged toward the camera body.

The torsion coil spring 124 is shown in FIGS.
As shown in, the coil portion 120c has a cylindrical shape and hooks 124a and 124b projecting radially outward from both ends thereof. The coil portion 120c is attached in a compressed state and urges the first and second lens frames 110a and 110b toward the body side of the camera, that is, the intermediate wall 60, so that the first and second lens frames 110a and 110b are moved in the optical axis direction. It is designed to prevent rattling. Therefore, the shift of the focus due to the movement of the first and second lenses 14a and 14b in the optical axis direction is prevented.

The torsion coil spring 124 is shown in FIG.
As shown in FIGS. 1 and 12, one hook 124a is attached to the advancing cylinder 52, and the other hook 124b is attached to the shaft supporting portions 114a and 114b of the lens frames 110a and 110b. As a result, the torsion coil spring 124 causes the first and second lens frames 110a, 110
Since b is twisted and urged in the clockwise direction indicated by arrows 128a and 128b in the figure, the first and second lens frames 110a, 110a,
Gears 117a and 117 of the input units 116a and 116b of 110b
Regardless of the rotation direction of the drive gear 136, b and the drive gear 136 always contact the tooth surfaces on the same side. Therefore,
A delay in rotation transmission due to backlash between the gears 117a, 117b, 136 at the time of meshing, that is, during reverse rotation of the drive gear 136 is prevented.

Further, the torsion coil spring 124 constantly urges the shaft support portions 114a and 114b of the lens frames 110a and 110b in one direction with respect to the support shafts 120a and 120b. Therefore, the shafts are not fitted, that is, the support shafts 120a and 120a.
Variations in the inclination of the lens frames 110a and 110b with respect to b are prevented.

As described above, the first and second lens frames 1
10a, 110b, using the torsion coil spring 124,
The support shafts 120a and 120b are attached so that rattling does not occur.

Next, the mounting structure of the drive motor 130 will be described.

The drive motor 130 used in this embodiment
Is a cylindrical DC motor, and this motor 130 is
The outer diameter is smaller than that of a general motor, and the front end surface 130a (see FIGS. 14 and 15) on the output shaft 134 side is not provided with a screw hole for fixing. Therefore, the exploded perspective view of FIG. 14 and FIG.
5, the drive motor 130 is once attached to the motor holder 140, and the motor holder 140 attached with the drive motor 130 is fixed to the intermediate wall 60 of the advancing barrel 52 of the lens barrel 10.

More specifically, the motor holder 140 is composed of a motor mounting wall 144 and a base portion 142 which are joined together in a generally L-shape.

The motor mounting wall 144 has the drive motor 130.
The outer wall, that is, the half-split cylindrical wall curved along the outer peripheral surface 130b. Lower inner peripheral surface 145b of the motor mounting wall 144
Is a curved surface that is approximately equal to the outer peripheral surface 130b of the drive motor 130. Upper inner peripheral surface 145a of the motor mounting wall 144
Of the positioning protrusion 146 that protrudes radially inward
Is formed. A rotation stopper protrusion 148 that protrudes downward is provided on the lower portion of the motor mounting wall 144.

The base portion 142 projects radially outward from the lower portion of the motor mounting wall 144 and has an elongated hole 143 penetrating in the vertical direction. Lower surface 142a of base portion 142
The lower inner peripheral surface 145b of the motor mounting wall 144 and the lower inner peripheral surface 145b of the motor mounting wall 144 are formed at right angles.

The intermediate wall 60 of the forward cylinder 52 is provided with a motor mounting hole 62. The motor mounting hole 62 has a motor insertion hole 62a that is slightly larger than the outer diameter of the drive motor 130.
And a positioning hole 62b having an inner diameter substantially equal to the outer diameter of the bearing portion 132 of the drive motor 130 are coaxially formed in a stepped cross section, and a part of the outer peripheral surface of the motor insertion hole 62a is
A cutout groove 62c is formed by cutting out in the axial direction from the motor insertion hole 62a side. Intermediate wall 60 of the moving cylinder 52
Is provided with a screw hole 64 at a position appropriately separated from the motor mounting hole 62.

The drive motor 130 is attached to the intermediate wall 60 of the advancing cylinder 52 by using the motor holder 140 having the above-described configuration as described below.

First, using the adhesive 138, for example, the double-sided adhesive tape 138, the outer peripheral surface 130 of the drive motor 130 is used.
b and the lower inner peripheral surface 145b of the motor mounting wall 144 of the motor holder 140 are bonded. At this time, the drive motor 13
The rear end surface 130c of the motor holder 140 opposite to the output shaft 134 is positioned by the positioning protrusion 1 of the motor mounting wall 144 of the motor holder 140.
The shoulder portion 146a of 46 abuts. As a result, the drive motor 130 is positioned and fixed in a direction perpendicular to the lower surface 142a of the base portion 142 of the motor holder 140 and in the axial direction with the lower surface 142a as a reference. The double-sided adhesive tape 138 is used for the motor mounting wall 14 of the motor holder 140.
Lower inner peripheral surface 145b and outer peripheral surface 1 of the drive motor 130
Since the variation in the distance between the drive motor 130 and the motor holder 1 can be absorbed to some extent by the change in thickness, the drive motor 130 can be mounted on the motor holder 1 even if the outer diameter of the drive motor 130 varies slightly.
It can be firmly fixed to 40. Drive motor 1
When 30 is fixed to the motor holder 140, the output shaft 134 and the bearing portion 132 of the drive motor 130 project below the lower surface 142a of the base portion 142 of the motor holder 140.

Next, the motor holder 140 to which the drive motor 130 is fixed is fixed to the intermediate wall 60. That is, the output shaft 134 side of the drive motor 130 is inserted into the motor mounting hole 62 of the intermediate wall 60, and the base portion 14 of the motor holder 140 is inserted.
The fixing screw 149 is inserted into the second long hole 143 to insert the intermediate wall 60.
By screwing into the screw hole 64 of the motor holder 1
40 is fixed to the intermediate wall 60. At this time, by engaging the rotation stop protrusion 148 of the motor holder 140 with the cutout groove 62c of the motor mounting hole 62 of the intermediate wall 60, positioning of the motor holder 140 is facilitated and the motor holder 140 is screwed. Motor holder 14
Prevents 0 from rotating. That is, the radially extending surface of the cutout groove 62c of the motor mounting hole 62 of the intermediate wall 60, that is, the rotation stop surface, and the radially extending surface of the rotation stop protrusion 148 of the motor holder 140, that is, the rotation stop engagement. The surface abuts on each other to facilitate positioning of the motor holder 140 and prevent rotation of the motor holder 140.

When the motor holder 140 is attached to the intermediate wall 60, the bearing portion 132 of the drive motor 130 fits into the positioning hole 62b of the intermediate wall 60, and the drive motor 13
Position 0. Since the bearing portion 132 of the drive motor 130 has less variation in outer diameter, the output shaft 134 of the drive motor 130 can be accurately positioned. Further, since the lower surface 142a of the base portion 142 of the motor holder 140 contacts the mounting surface 60a of the intermediate wall 60, the drive motor 130 fixed to the motor holder 140 moves in the direction perpendicular to the mounting surface 60a of the intermediate wall 60. Supported.

That is, the output shaft 134 of the drive motor 130.
The position within the mounting surface 60a is determined by fitting the bearing portion 132 of the drive motor 130 and the positioning hole 62b of the intermediate wall 60. Also, the output shaft 1 of the drive motor 130
The inclination of 34 with respect to the mounting surface 60a is
Motor mounting wall 144 of motor holder 140 for mounting
It is determined by the perpendicularity between the lower inner peripheral surface 145b and the lower surface 142a of the base portion 142.

The motor insertion hole 6 of the motor mounting hole 62
The inner diameter of 2a is made slightly larger than the outer diameter of the drive motor 130, and a radial gap is provided between the rotation stopper protrusion 148 of the motor holder 140 and the cutout groove 62c of the motor mounting hole 62, thereby providing a base for the motor holder 140. Slotted part 14 in part 142
By providing 3, the variation in the outer diameter of the drive motor 130 can be absorbed.

In the first embodiment described above, the motor holder 14
0 is used to mount the drive motor 130 at a right angle on the mounting surface 60a of the intermediate wall 60 extending in the direction perpendicular to the optical axis. Next, the drive motor 130 is mounted at a right angle to the vertical wall 180 corresponding to the intermediate wall 60. A lateral wall 1 provided with 184 and extending in the optical axis direction
A second embodiment in which the drive motor 130 is mounted in parallel with the mounting surface 184a of 84 will be described with reference to FIGS. Below, it demonstrates centering around a different point from 1st Embodiment, and uses the same code | symbol for the part comprised similarly to 1st Embodiment.

In the motor holder 150 of the second embodiment, as shown in the exploded perspective view of FIG. 16 and the assembly sectional view of FIG. 17, the motor mounting wall 154 and the base portion 152 are connected in a generally T-shape.

The motor mounting wall 154 has the drive motor 130.
The outer peripheral surface, that is, a semi-split cylindrical wall that curves along the outer peripheral surface 130b, and the inner peripheral surface 154a is a curved surface that is approximately equal to the outer peripheral surface 130b of the drive motor 130.

The base portion 152 has a long hole 153 which projects radially outward from the central portion of the outer peripheral surface 154b of the motor mounting wall 154 and penetrates in the substantially circumferential direction. Base portion 152
One side surface that extends in the circumferential direction, that is, the lower surface 152a,
The curved center axis of the inner peripheral surface 154a of the motor mounting wall 154 is included in the same plane.

The motor holder 150 includes the vertical walls 18 which are orthogonal to each other.
It is designed to be attached to the intersection of 0 and the lateral wall 184. That is, in the vertical wall 180, the motor mounting hole 18
Two are provided. The motor mounting hole 182 has an inner diameter substantially equal to the outer diameter of the bearing portion 132 of the drive motor 130.
It The mounting surface 184a of the lateral wall 184 for mounting the motor holder 150 is at the same height as the center of the motor mounting hole 182 of the vertical wall 180. The lateral wall 184 has a motor mounting hole 1
A groove portion 186 is formed by curving downward in the vicinity of 82. The mounting surface 184a of the lateral wall 184 is provided with screw holes 189 at appropriate positions.

Like the first embodiment, the drive motor 130 uses the double-sided adhesive tape 138 to drive the drive motor 130.
The outer peripheral surface 130b is adhered to the inner peripheral surface 154a of the motor mounting wall 154 of the motor holder 150. The double-sided adhesive tape 138 can firmly fix the drive motor 130 to the motor holder 150 even if the outer diameter of the drive motor 130 varies due to the change in thickness, and further, the bearing portion of the drive motor 130. 132 and output shaft 1
The central axis of 34 and the lower surface 152a of the base portion 152 are included in the same plane.

The motor holder 150 to which the drive motor 130 is fixed is fixed to the mounting surface 184a of the lateral wall 184. That is, the output shaft 134 and the bearing portion 132 of the drive motor 130 are inserted into the motor mounting hole 182 of the vertical wall 180, and the elongated hole 153 of the base portion 152 of the motor holder 150 is inserted.
The fixing screw 159 is inserted into the screw hole 189 of the lateral wall 184.
The motor holder 150 is fixed to the lateral wall 184 by screwing the lower surface 152a of the base portion 152 of the motor holder 150 and the mounting surface 184a of the lateral wall 184 by pressure.

The drive motor 130 attached in this manner can be installed in the vertical wall 18 as shown in the front view of FIG.
The position in the vertical wall 180 direction is accurately determined by the zero motor mounting hole 182. In addition, the vertical wall 1 of the drive motor 130
The inclination with respect to 80 is determined by the mounting surface 184a of the lateral wall 184. That is, as shown in the side view of FIG. 17 (B), the central axis of the drive motor 130 is included in the same plane as the mounting surface 184a of the lateral wall 184, and in the plane perpendicular to the vertical wall 180 and the lateral wall 184, It is perpendicular to the vertical wall 180 and parallel to the mounting surface 184a of the horizontal wall 184. Note that, as in the first embodiment, the motor holder 1
A positioning protrusion may be provided on the inner peripheral surface 154a of the motor mounting wall 154 of the motor 50 to position the drive motor 130 in the axial direction.

Next, a third embodiment in which the mounting structure of the lens support frames 110x and 110y of the image stabilizing optical system 14 is different from that of the first embodiment will be described with reference to FIGS. Below, it demonstrates centering around a different point from 1st Embodiment, and uses the same code | symbol for the part comprised similarly to 1st Embodiment.

First and second lens frames 1 of the third embodiment
10x and 110y, as shown in the exploded perspective view of the main part of FIG. 18 and the assembly view of FIG. 19 for the second lens support frame 110y, a part of the cylindrical wall 162 of the shaft support 160 is cut continuously in the axial direction. It is a half-cracked shape that is missing, and the outside and shaft hole 1
It has an opening 163 communicating with 61. This opening 1
A pair of upper contact surfaces 164a, 164b extending in the axial direction and forming an angle of about 120 degrees with each other are formed on the upper side of the inner peripheral surface of the cylindrical wall 162 so as to face 63. The bisector of the pair of upper contact surfaces 164a, 164b passes through the center of the shaft hole 161 of the shaft support 160 and the center of the opening 163. Similarly, a pair of lower contact surfaces 165a, 165b are formed on the lower side of the inner peripheral surface of the cylindrical wall 162. Further, spring engaging protrusions 166a and 166b protruding in the axial direction are formed on the upper and lower end surfaces of the cylindrical wall 162 of the shaft support 160, respectively.

The leaf spring member 170 is fitted and engaged with the upper and lower spring engaging protrusions 166a and 166b. The leaf spring member 170, as shown in FIG.
It is composed of one plate-shaped member, and has a central connecting portion 174 and engaging ring portions 172a and 172b at both ends bent at substantially right angles to the connecting portion 174.

The connecting portion 174 includes the engaging ring portions 172a, 172a.
On the same side as the bent side of 72b, it is curved in a dogleg shape so that its central portion 175 projects most. A substantially circular opening 173 is formed in each of the pair of engagement ring portions 172a and 172b, and the lens frame 110
Spring engaging projections 166a, 16 of the x, 110y shaft support 160
It is designed to fit onto 6b. The pair of engagement ring portions 172a, 172b are parallel to each other, and the distance between them is determined by the upper and lower step surfaces 168a, 1 of the cylindrical wall 162 of the shaft support portion 160.
Is approximately equal to the distance between 68b.

The lens frames 110x and 110y are provided with the shaft support 16
No. 0 spring engaging protrusions 166a, 166b are attached to the leaf spring member 170.
After attaching, is attached to the support shafts 120a and 120b.

That is, first, the gap between the pair of engaging ring portions 172a and 172b of the leaf spring member 170 is widened, and the spring engaging protrusion 16 of the shaft supporting portion 160 of the lens frames 110x and 110y is expanded.
6a and 166b, the engaging ring portion 172 of the leaf spring member 170
Insert a and 172b. Leaf spring member 170 fitted
Since the space between the engagement ring portions 172a and 172b is restored to the original state, it does not come out of the spring engagement protrusions 166a and 166b of the shaft support portion 160. At this time, the connecting portion 174 of the leaf spring member 170 faces the opening 163 of the shaft supporting portion 160, and the central portion 175 of the connecting portion 174 projects toward the shaft hole 161 side of the shaft supporting portion 160.

Next, as shown in FIG. 19 (B), the support shafts 120a and 120b are passed through the shaft holes 161 of the shaft support 160 with which the leaf spring member 170 is engaged, and the coil spring 178 is connected to the support shafts 120a and 120a. The front wall 6 of the forward cylinder 52 is passed through 120b.
Lens frames 110x and 110y are attached between 6 and the intermediate wall 60.

In the leaf spring member 170 thus mounted, the central portion 175 of the connecting portion 174 is the support shaft 12.
0a, 120b, and the engaging ring portions 172a, 172b pull the shaft support 160 toward the support shafts 120a, 120b, so that the pair of upper and lower contact surfaces 164a of the shaft support 160 of the lens support frames 110x, 110y, 164b, 165a, 165b
Are brought into contact with the support shafts 120a and 120b. And
When viewed from the axial direction as shown in FIG. 19 (A), two points with the pair of contact surfaces 164a, 164b or 165a, 165b and one point with the central portion 175 of the connecting portion 174 of the leaf spring member 170 are provided. 19 in total, and when viewed from the direction perpendicular to the axis as shown in FIG. 19B, the upper and lower contact surfaces 164a, 165a or 164b, 165b of the shaft support 160 and the leaf spring member. At a total of three points including one point with the central portion 175 of the connecting portion 174 of 170, more strictly speaking, with the pair of upper and lower abutment surfaces 164a, 164b, 165a, 165b of the shaft supporting portion 160.
The central portion 175 of the connecting portion 174 of the point and the leaf spring member 170
5 points in total, including 1 point, lens support frame 110x, 110y
The leaf spring member 170 contacts the support shafts 120a and 120b.

Therefore, the lens frames 110x and 110y
Are supported on the support shafts 120a and 120b without any shaft fitting.

By the way, in FIGS. 18 and 19, the second lens 1
Although only the main part of 10y is illustrated, the shaft support parts 160 of the first and second lens support frames 110x and 110y are
As shown in the main part plan views of FIGS. That is, as shown in FIG. 20, the first lens frame 110x is configured such that the opening 163 of the shaft support 160 is located on the input part 116a side of the first lens frame 110x, that is, the optical axis side. On the other hand, as for the second lens frame 110y, as shown in FIG.
Reference numeral 63 is configured so as to come to the side opposite to the input section 116b of the second lens frame 110y, that is, the side opposite to the optical axis.

The drive gear 136 is constructed as described above.
And the gears 117a and 117b of the input portions 116a and 116b mesh with each other, the force acting on the first and second lens frames 110x and 110y is applied to the pair of upper and lower contact surfaces 16 of the shaft support portion 160.
This is for receiving at 4a, 164b, 165a, 165b.

That is, as shown in FIG. 20, in the first lens frame 110x, the internal gear 117a of the input section 116a meshes with the drive gear 136, so that the drive gear 136 is moved from the support shaft 120a to the drive gear 136 as shown by an arrow 190a. Receive a force in the direction of. If the leaf spring member 170 is configured to receive this force, that is, unlike the configuration shown in FIG. 20, the opening 163 of the shaft support 160 is inserted into the input portion 116a.
If it is provided on the opposite side, the first lens frame 110x moves in the direction of the drive gear 136a and the first lens 14a moves in a direction substantially perpendicular to the control direction unless the spring biasing force of the leaf spring member 170 is increased. However, there is a possibility that the problem that the image forming position cannot be controlled due to moving to the position.

The second lens frame 110y has the input unit 1
By engaging the outer gear 117b of 16b with the drive gear 136, a force in the direction from the drive gear 136b to the support shaft 120b is received, as indicated by an arrow 190b in FIG. If the leaf spring member 170 is configured to receive this force, that is, if the opening 163 of the shaft support 160 is provided on the input portion 116b side, unlike the configuration shown in FIG. 21, the same problem occurs.

Therefore, with the structure shown in FIGS. 20 and 21, the force acting on the first and second lens frames 110x and 110y due to the meshing with the drive gear 136 is applied to the shaft supporting portion 160.
A pair of upper and lower contact surfaces 164a, 164b, 165a, 165
It was designed to be received at b.

Therefore, even if the spring biasing force of the leaf spring member 170 is not increased, the first and second lens frames 110 are
It can be configured so that x and 110y are stably rotated.

The present invention is not limited to the above embodiments, but can be implemented in various other modes.

[Brief description of drawings]

FIG. 1 is a sectional view of a lens barrel according to a first embodiment of the present invention. Indicates the collapsed state.

FIG. 2 is a cross-sectional view of the lens barrel of FIG. 1 in a wide end state.

3 is a sectional view of the lens barrel of FIG. 1 in a telephoto end state.

FIG. 4 is a sectional view of a lens barrel similar to FIG. The cross-sectional position is different from that in FIG.

5 is an exploded perspective view of a main part of the lens barrel of FIG.

FIG. 6 is a development view of a cam ring of the lens barrel of FIG.

FIG. 7 is a development view of a cam ring having a configuration different from that of FIG.

FIG. 8 is a development view of a cam ring having another configuration different from that of FIG.

FIG. 9 is a schematic diagram of a lens frame of the image stabilization optical system.

10 is an assembled front view of a vibration-proof optical system of the lens barrel of FIG.

11 is a front view of the main parts of the first lens of FIG.

12 is a front view of the main parts of the second lens of FIG.

13 (A) is a cross-sectional view of the main part taken along the line AA of FIG. FIG. 12B is a sectional view of the main part taken along the line BB of FIG.

FIG. 14 is an exploded perspective view of a mounting structure for a drive motor of a vibration isolation optical system.

FIG. 15 is an assembled sectional view of FIG.

FIG. 16 is an exploded perspective view of a drive motor mounting structure for the vibration-proof optical system of the lens barrel of the second embodiment of the present invention.

FIG. 17 is an assembled sectional view of FIG. 16.

FIG. 18 is an exploded perspective view of a main part of a lens frame of the image stabilizing optical system of the lens barrel of the third embodiment of the present invention.

FIG. 19 is an assembly diagram of a main part of FIG. 18. (A) is an assembly plan view of a main part, and (B) is a sectional view of the main part assembly.

20 is a plan view of relevant parts of the first lens of the image stabilization optical system in FIGS.

FIG. 21 is a plan view of a principal portion of a second lens of the image stabilization optical system shown in FIGS.

FIG. 22 is a development view of a conventional cam ring.

FIG. 23 is a perspective view of a photographic lens including a conventional image stabilization optical system.

[Explanation of symbols]

10 Lens barrel 12 Main photographing optical system 12a First lens group 12b Second lens group 12c Third lens group 14 Anti-vibration optical system 14a First lens (lens group) 14b Second lens (lens group) 14s, 14t, 14u String 16 Focus unit 18 Shutter unit 20 Fixed part 22 Fixed cylinder 24 Lead 26 Straight guide groove 30 First moving part 32 Cam ring 32s Rear end 32t Tip 34 Lead engaging part 36 First cam 36a Wide end position 36b Tele end position 37 Second cam 37a Wide end position 37b Tele end position 38 Third cam 38a Wide end position 38b Tele end position 39 First thin-walled cylinder 40 Straight advance cylinder 42 Straight advance engagement part 44 Cylindrical part 46 Guide arm 50 Second moving part 52 Advance cylinder 54 peripheral wall 56 guide groove 58 cam follower 59 second thin wall tube 60 intermediate wall 60a mounting surface 62 motor mounting hole 62a motor insertion hole 62b positioning Hole 62c Notched groove 64 Screw hole 66 Front wall 68a, 68b, 69a, 69b Abutment surface 70 Focus block 72 Main body 73 Flange 74 Straight guide groove 75 Straight guide groove 76 Cam follower 80 Third lens holder 82 Main body 84 Cam follower 90s, 90t Effective luminous flux range 91x, 91y Rotation center 91c Optical axis 92a, 92b First lens frame 93a, 93b Lens opening 94a, 94b Second lens frame 95a, 95b Lens opening 96 Optical axis direction 98 Circumferential direction 99 Front 102 Light emitting element 104 position Detection elements 110a, 110b, 110x, 110y Lens frames (lens supporting means) 112a, 112b Frame bodies (lens frame members) 112s, 112t Strings 114a, 114b Shaft supporting portions 115a, 115b Shaft holes 116a, 116b Input portions 117a, 117b Gears 118a , 118b, 119a, 119b Side surfaces 120a, 120b Support shaft 122 Washer 124 Screw Coil springs 124a, 124b hooks 124c coil portion 130 drive motor 130a front end surface 130b outer peripheral surface 130c rear end surface 132 bearing portion 134 output shaft 136 drive gear 138 adhesive 140 motor holder 142 base portion 142a lower surface 143 long hole 144 motor mounting wall 145a , 145b Inner peripheral surface 146 Positioning protrusion 146a Shoulder portion 148 Rotation stop protrusion 149 Fixing screw 150 Motor holder 152 Base portion 152a Lower surface 153 Slotted hole 154 Motor mounting wall 154a Inner peripheral surface 154b Outer peripheral surface 159 Fixing screw 160 Shaft supporting portion 161 Shaft hole 162 Cylindrical wall 163 Openings 164a, 164b Upper contact surfaces 165a, 165b Lower contact surfaces 166a, 166b Spring engagement protrusions 168a, 168b Step surface 170 Leaf spring members 172a, 172b Engagement ring portion 173 Opening portion 174 Connecting portion 175 Central portion 178 coil 180 vertical wall 182 motor mounting hole 184 transverse walls 184a mounting surface 186 in the groove 186a circumferential surface 189 threaded hole

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G03B 5/00 G02B 7/04

Claims (3)

(57) [Claims] 1. At least two lens groups (14a, 14)
Lens support means (1) for holding the respective lens groups (14a, 14b) of the image stabilizing afocal lens (14)
In the lens barrel (10) provided with 10a, 110b), each of the lens supporting means (110a, 110b) is rotatable in a plane perpendicular to the optical axis around a point in the lens barrel (10). Each lens group of the vibration-proof afocal lens (14) supported
The lens supporting means (110b) for holding the lens group ( 14b) having the smallest effective luminous flux range among (14a, 14b)
Is a lens barrel characterized by being driven along the long side direction of the effective light flux range. 2. At least one lens group (14a,
14b) and the at least one lens group (14a, 1)
4b) supporting the lens support means (110a, 110b)
The ball frame members (112a, 112b) are each a part of the outer shape of which the cross section perpendicular to the optical axis is substantially circular, and are formed by chords (14s, 14t, 14b).
The lens barrel according to claim 1, wherein the lens barrel has a shape of u; 112s, 112t). 3. At least one lens group (14a,
14b) and the at least one lens group (14a, 1)
4b) supporting the lens support means (110a, 110b)
Each of the chords (14s, 14t, 1
4u; 112s, 112t) is formed along at least the long side direction of the effective luminous flux range.
The lens barrel described.