JP3380022B2 - Multi-stage extension zoom lens barrel - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a multi-stage extension zoom lens barrel.

[0002]

2. Description of the Related Art In recent years, compact cameras equipped with zoom lenses have a lens barrel which is extended from the camera body in some way in use in order to shorten the storage length. However, conventionally, two-stage feeding is generally used, and it has been difficult to simultaneously realize a short storage length (thinner camera body) and a demand for a high zoom ratio of the zoom lens.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a multi-stage feed zoom lens barrel which realizes a shortened storage length and facilitates downsizing of a camera.

The multistage repeat of the present invention for achieving the above object
The output zoom lens barrel includes a rotation barrel to which rotation is applied,
It is supported inside the rotating cylinder so that it can only move linearly in the optical axis direction.
The rotation force of the rotary cylinder is used as a drive source to generate light to the rotary cylinder.
Each has a straight advancing cylinder that moves relatively in the axial direction, and
A plurality of feeding cylinder units concentrically provided adjacent to each other;
Also supported by the feeding cylinder unit located on the inner diameter side,
Both front and rear movable zoom lens groups; and adjacent in the radial direction
On the inner peripheral surface of the pair of rotating barrels of the pair of feeding barrel units.
Each of the inner gear formed and the inner
At the center of rotation parallel to the optical axis
The pair of rotatable pinions and the pair of delivery cylinder units
Despite the change in the relative position in the optical axis direction, the rotation of one pinion
Rotation transmission having a rotation transmission shaft for transmitting rotation to the other
Equipped with a reaching mechanism; a pair of feeding by this rotation transmission mechanism
The rotational force of one rotary cylinder of the cylinder unit is transmitted to the other rotary cylinder.
It is characterized by reaching .

The present inventionMulti-stage zoom lens barrel
According to another aspect,When given rotation, in the optical axis direction
Go back and forthA first inner gear having an inner gearRevolving back and forth
Cylinder; Linear movement in the direction of the optical axis inside the first rotation advancing / retreating cylinder
Supported only possible, firstBy the rotation of the barrel
For the first rotation advancing / retreating cylinderAlong the optical axisRelative movementDoFirst
OneStraight barrelLocated inside this first straight barrel,
When given, it moves relative to the first rectilinear barrel in the optical axis direction.
Moving, second rotation forward / backward with inner gear on inner peripheral surface
Cylinder; linear movement in the optical axis direction inside this second rotation advancing / retreating cylinder
Supported only possible, secondBy the rotation of the barrel
For the second rotation advancing / retreating cylinderAlong the optical axisRelative movementDoFirst
2'sStraight barrel; And the first rotation advance / retreat cylinder and the second rotation advance / retreat
Rotate parallel to the optical axis by always meshing with the inner gear of the cylinder
A pair of pinions rotatable about the center, and the pair of pinions
First advance / retreat cylinder regardless of relative position change in the optical axis direction of
Rotate the pinion on the side to the pinion on the side of the second rotation advancing / retreating cylinder.
Rotation transmission shaft to transmitCharacterized by having;
There is.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to illustrated embodiments. First, a four-stage extension zoom lens barrel, which is a first embodiment of the present invention, will be described with reference to FIGS. 1 and 2. In this embodiment, the front lens group L1 and the rear lens group L2 constitute a zoom lens system, and the front lens group L1 is used for focusing.

A fixed lens barrel 5 fixed to the camera body 10.
2, the female helicoid 52a and the linear guide groove 52b parallel to the optical axis O are formed on the inner peripheral surface thereof. Fixed lens barrel 5
A drive gear 50 is provided on the outer peripheral side of 2 with a rotating shaft 51 rotatably supported. This drive gear 50 is
A plurality of pinions 50a having the same diameter and a predetermined width are provided at predetermined intervals in the axial direction of the rotating shaft 51. Each of these pinions 50a has a fixed lens barrel 52.
It is projected to the inner peripheral side of the fixed lens barrel 52 from a not-shown notch formed in the above.

At the inner circumference of the fixed lens barrel 52, a second rotary cylinder ( first
1 rotation advancing / retreating cylinder) 13 is fitted. The second rotary cylinder 13 is driven to rotate and advances and retreats in the optical axis direction when given rotation, and the male helicoid 13 that meshes with the female helicoid 52a of the fixed lens barrel 52 behind the optical axis on the outer peripheral surface thereof.
f and an outer peripheral gear 13e that meshes with the drive gear 50. The male helicoid 13f is formed so as to be inclined in the circumferential direction of the fixed barrel 52. The outer peripheral gear 13e is
In order to mesh with the pinions 50a provided at predetermined intervals without any hindrance during the movement in the optical axis direction, they are formed in parallel with the male helicoid 13f and inclined with respect to the circumferential direction. Further, the second rotary cylinder 13 has, on its inner peripheral surface, a lead groove 13c formed by being inclined in the circumferential direction, and an inclined inner gear 13d formed in parallel with the lead groove 13c.

A linear guide member 44 having a linear guide groove (not shown) is provided on the inner circumference of the second rotary cylinder 13. The second rotary cylinder 13 is provided at the rear of the straight guide member 44.
The straight guide plate 53 is fixed by fixing screws with the inner peripheral flange 13g formed on the rear inner periphery sandwiched. The straight-movement guide plate 53 has a straight-movement key 53a guided in a straight-movement guide groove 52b on the inner circumference of the fixed lens barrel 52. Therefore, the second rotary cylinder 13 is rotatable relative to the fixed lens barrel 52,
The straight guide member 44 and the straight guide plate 53 are the fixed lens barrel 52.
The relative rotation with is restricted. That is, when the second rotary cylinder 13 rotates, it moves in the optical axis direction while rotating due to the relationship between the male helicoid 13f and the female helicoid 52a, and the linear guide member 44 and the linear guide plate 53 do not rotate but do the second rotation. It moves in the optical axis direction together with the tube 13.

The inner circumference of the second rotary cylinder 13 also has this second
A second straight-moving barrel (first straight-moving barrel) 14 that is moved straight in the optical axis direction by the rotation of the rotary barrel 13 is fitted. On the outer circumference of the second rectilinear cylinder 14, there are provided rectilinear guide pins 14b which are simultaneously fitted into the lead grooves 13c on the inner circumference of the second rotary cylinder 13 and the rectilinear guide grooves of the rectilinear guide member 44.
A female helicoid 14c and a rectilinear guide groove 14d formed parallel to the optical axis O are formed on the inner circumference of the second rectilinear barrel 14.

A first rotary cylinder (second rotary advance / retreat cylinder) 15 which is supported by the second straight advance cylinder 14 and moves in the optical axis direction when rotated is fitted to the inner circumference of the second straight advance cylinder 14. Have been combined. A male helicoid 15a screwed into the female helicoid 14c of the second rectilinear barrel 14 is formed behind the optical axis of the outer peripheral surface of the first rotary barrel 15. A female helicoid 15c and a circumferential inner gear 15e are provided on the inner peripheral surface of the first rotary cylinder 15.
And a cam groove 15f inclined in the circumferential direction are formed. A rear lens group L2 is arranged on the inner circumference of the first rotary cylinder 15. The rear lens group frame 24 of the rear lens group L2
Has a linear guide protrusion 24a protruding in the radial direction and a guide pin 24b provided at the tip of the linear guide protrusion 24a. The straight-movement guide protrusion 24a is guided by a straight-movement key 16b of a straight-movement guide member 16 which will be described later, and also the guide pin 24.
b is fitted in the cam groove 15f on the inner circumference of the first rotary cylinder 15. Therefore, the rear lens group L2 moves straight in the optical axis direction without rotating when the first rotary cylinder 15 rotates, due to the relationship between the straight guide projection 24a and the straight key 16b and the relationship between the guide pin 24b and the cam groove 15f. .

The inner circumference of the first rotary cylinder 15 also has the first
A first straight-moving barrel (second straight-moving barrel) 22 that moves forward and backward in the optical axis direction by the rotation of the rotary barrel 15 is fitted. A male helicoid 22a that is screwed into the female helicoid 15c of the first rotary cylinder 15 is formed behind the optical axis of the outer peripheral surface of the first rectilinear cylinder 22. The straight guide member 16 is also located on the inner circumference of the first rotary cylinder 15, and the straight guide member 1 is provided.
A gear support / straight guide plate 17 is fixed to the rear end portion of 6 by a fixing screw. The first rotary cylinder 15 is formed with an inner flange 15b which is relatively rotatably sandwiched between the straight guide member 16 and the straight guide plate 17. Also,
The straight-movement key 17a formed on the straight-movement guide plate 17 is fitted in the straight-movement guide groove 14d of the second straight-movement barrel 14. Therefore,
The first rotary cylinder 15 is rotatable relative to the second rectilinear cylinder 14, and the rectilinear guide member 16 and the rectilinear guide plate 17 are the second rectilinear cylinder 14.
Relative rotation with is restricted. That is, when the first rotary cylinder 15 rotates, the first rotary cylinder 15 moves in the optical axis direction while rotating in accordance with the male helicoid 15a and the female helicoid 14c, and the straight guide member 16 and the straight guide plate 17 do not rotate. It moves in the optical axis direction together with 15.

The straight-movement guide member 16 is provided with the straight-movement key 16b in a direction parallel to the optical axis. The straight-movement key 16b has a straight-movement key 18a of the front group straight-movement guide member 18.
Are engaged. A shutter block 20 is fixed to the front group linear guide member 18 with a fixing screw. Since the shutter block 20 is fixed to the first rectilinear barrel 22, the shutter block 20 and the first rectilinear barrel 22 are restrained from rotating, and are allowed to move only in the optical axis direction.

The shutter block 20 has a female helicoid 20a on its shaft, and the female helicoid 20a is
The male helicoid 23a of the front lens group frame 23 to which the front lens group L1 is fixed is screwed. The shutter block 20
As is well known, the front lens group frame 23 is rotated according to the helicoids 20a and 23a via the drive pin 20b and the linking protrusion 23b based on the object distance signal from the distance measuring device to move to the in-focus position. Shutter block 20
Has a shutter blade 20c that opens and closes according to the subject brightness signal. This shutter block 20 has an F
A drive signal is given via the PC board 20d.

Next, a drive mechanism for giving rotation to the first rotary cylinder 15 will be described. This rotary drive mechanism basically transfers the rotation of the second rotary cylinder 13 to the first rotary cylinder 15. A pair of gear support plates 26 and 27 are fixed to the rear end of the second rectilinear barrel 14 with fixing screws. A pinion 30 meshing with the inclined inner gear 13d of the second rotary cylinder 13 is rotatably supported on the gear support plate 26. This pinion 30 has a second straight barrel 14
It is housed in a pinion housing space (not shown) formed in the rear end surface, and a part of its tooth surface projects from the outer surface of the second rectilinear cylinder 14. Inclined inner gear 13 of the second rotary cylinder 13
Since d is formed parallel to the lead groove 13c, the meshing relationship between the pinion 30 and the inclined inner gear 13d is maintained even if the second rectilinear barrel 14 moves in the optical axis direction by the rotation of the second rotary barrel 13. It A gear train 31 that receives the rotation of the pinion 30 is supported between the gear support plates 26 and 27, and a rotation transmission shaft 32 that extends forward is integrally fixed to the shaft portion of the final gear 31a. There is.
The rotation transmission shaft 32 has a non-circular uniform cross section.

On the other hand, the straight transmission guide plate 17 fixed to the rear end surface of the straight movement guide member 16 has the rotation transmitting shaft 3
A take-out pinion 33, which is freely movable in the axial direction with respect to 2, and rotates integrally with the shaft 32, is supported in a state in which the axial movement is restricted. In other words, take-out pinion 33
Always moves in the optical axis direction together with the linear guide plate 17 and the first rotary cylinder 15. And this take-out pinion 33 is
A circumferential inner gear 15 formed on the inner surface of the first rotary cylinder 15
It meshes with e. Therefore, the rotation of the second rotary cylinder 13 can be performed regardless of the position of the second rectilinear cylinder 14 in the optical axis direction.
Through the rotation transmission mechanism 48 including the inclined inner gear 13d, the pinion 30, the gear train 31, the rotation transmission shaft 32, the extraction pinion 33, and the circumferential inner gear 15e, the first
It is transmitted to the rotary cylinder 15.

In the present zoom lens barrel having the above structure, when the drive gear 50 is rotationally driven by the drive of the motor, the second
While the rotating cylinder 13 moves while rotating in the optical axis direction,
In the second straight-moving barrel 14, the straight-moving guide pin 14b is in the lead groove 1.
By being guided to 3c and linear guide grooves straight advancing guide member 44, moves straight in the optical axis direction without rotating.
At this time, the first rotary cylinder 15 is rotated by the rotation of the second rotary cylinder 13, and the male helicoid 15a and the female helicoid 1 are rotated.
Due to the relationship of 4c, it moves in the optical axis direction while rotating.
At the same time, the first rectilinear barrel 22 moves in the optical axis direction without rotating due to the relationship between the female helicoid 15c and the male helicoid 22a of the rotating first rotary cylinder 15 and the relationship between the rectilinear key 16b and the rectilinear key 18a. . The front lens group L1 is
It moves in the optical axis direction together with the first rectilinear barrel 22, and the rear lens group L
2 is the relationship between the straight-movement guide protrusion 24a and the straight-movement key 16b, and the guide pin 24b and the cam groove 15f on the inner circumference of the first rotary cylinder 15.
Due to the relationship with, it moves in the optical axis direction without rotating. Therefore, the front lens group L1 and the rear lens group L2, which are the movable variable power lens groups of the front and rear two groups, can move linearly while performing the zooming while changing the air gap between them.

Next, with reference to FIG. 3, description will be given of a five-stage extension zoom lens barrel which is a second embodiment of the present invention. In this embodiment, the first rectilinear barrel 22, the first rotary barrel 15
And a configuration relating to the second rectilinear barrel 14, and the second rotary barrel 13
Part of the configuration is similar to that of the first embodiment described above. That is, in the second embodiment, a fixed lens barrel 67 is provided in place of the fixed lens barrel 52 of the first embodiment, and a third rotatable barrel 69 that can rotate only is provided in the fixed lens barrel 67. The third rotary cylinder 69 supports the third rectilinear cylinder 60, and the third rectilinear cylinder 60 further supports the second rotary cylinder 13.

The second rotary cylinder 13 is driven to rotate and advances and retreats in the optical axis direction when given a rotation. The male helicoid that meshes with the female helicoid 60a of the third rectilinear cylinder 60 in the optical axis direction of its outer peripheral surface. It has 13f. Second rotary cylinder 1
3 has a lead groove 13c formed on the inner peripheral surface thereof so as to be inclined in the circumferential direction, and an inclined inner gear 13d formed parallel to the lead groove 13c. A linear guide member 44 having a linear guide groove (not shown) is provided on the inner circumference of the second rotary cylinder 13. A rectilinear guide plate 53 is fixed to the rear part of the rectilinear guide member 44 with a fixing screw with an inner peripheral flange (not shown) formed on the inner circumference of the rear part of the second rotary cylinder 13 interposed therebetween. This straight guide plate 53
Has a straight-movement key 53a guided in a straight-movement guide groove (not shown) on the inner circumference of the third straight-movement barrel 60. Therefore, the second rotary cylinder 13 is rotatable relative to the third rectilinear cylinder 60, and the rectilinear guide member 44 and the rectilinear guide plate 53 are restricted from rotating relative to the third rectilinear cylinder 60. That is, the second rotary cylinder 13
When rotated, male helicoid 13f and female helicoid 6
Due to the relationship of 0a, the linear guide member 44 and the linear guide plate 53 move in the optical axis direction while rotating, and do not rotate to the second
It moves in the optical axis direction together with the rotary cylinder 13. Third straight barrel 60
The straight guide pin 6 which is fitted into the lead groove 69c and the straight guide groove 67e on the inner circumference of the third rotary cylinder 69 at the same time
0b is provided.

The fixed barrel 67 integrated with the camera body 10 is provided with an inner barrel 67a and an outer barrel 67b.
The rear ends of the inner cylinder 67a and the outer cylinder 67b in the optical axis direction are connected to the connecting wall 6
7c, the front end is open, and the third rotary cylinder 69 is rotatably fitted from the open end to the outer circumference of the inner cylinder 67a . The inner cylinder 67a is provided with a straight guide groove 67e in a direction parallel to the optical axis O. A circumferential spur gear 69a is integrally provided on the outer periphery of the third rotary cylinder 69, and a fine screw 69b is integrally formed on the outer periphery of the tip end thereof. Further, on its inner surface, a lead groove 69c inclined in the circumferential direction and an inclined inner gear 69d parallel to the lead groove 69c and inclined with respect to the circumferential direction are formed.

The inner barrel 67a of the fixed barrel 67 and the front end open portion of the outer barrel 67b have a fitting portion 70a with the inner surface of the outer barrel 67b.
And a screw portion 70b screwed to the fine screw 69b, and the inner cylinder 6
A support ring 70 having a contact portion 70c that contacts the outer surface of 7a is fixed. The supporting ring 70 is pressed toward the fixed lens barrel 67 side by an urging means (not shown) and is held at a fixed position. The outer barrel 67b of the fixed barrel 67 is provided with a notch (not shown ) for a pinion (not shown) that meshes with the flat gear 69a, and the inner barrel 67a exposes the lead groove 69c and the inclined inner gear 69d. Similar notches (not shown) are provided.

Next, a drive mechanism for giving rotation to the second rotary cylinder 13 will be described. This rotary drive mechanism basically transfers the rotation of the third rotary cylinder 69 to the second rotary cylinder 13. A pair of gear support plates 64 and 63 are fixed to the rear end of the third rectilinear barrel 60 with fixing screws. The gear support plate 64 rotatably supports a pinion 66 that meshes with the inclined inner gear 69 d of the third rotary cylinder 69. The pinion 66 is provided on the third straight-moving barrel 60.
It is housed in a pinion housing space (not shown) formed in the rear end surface, and a part of its tooth surface projects from the outer surface of the third rectilinear barrel 60. Inclined inner gear 69 of the third rotary cylinder 69
Since d is formed in parallel with the lead groove 69c, the meshing relationship between the pinion and the inclined inner gear 69d is maintained even if the third rectilinear barrel 60 moves in the optical axis direction by the rotation of the third rotary barrel 69. . A gear train 65 that receives rotation of the pinion is supported between the gear support plates 64 and 63, and a rotation transmission shaft 61 extending forward is integrally fixed to the shaft portion of the final gear 65a. .

On the other hand, the rotation transmitting shaft 6 is attached to the straight guide plate 53 fixed to the rear end surface of the straight guide member 44.
A take-out pinion 62, which is freely movable in the axial direction relative to 1, and rotates integrally with the shaft 61, is supported in a state in which the axial movement is restricted. That is, the takeout pinion 62
Always moves in the optical axis direction together with the rectilinear guide plate 53 and the second rotary cylinder 13. And this take-out pinion 62 is
A circumferential inner gear 13 formed on the inner surface of the second rotary cylinder 13.
It meshes with e. Therefore, the rotation of the third rotary barrel 69 is performed regardless of the position of the third rectilinear barrel 60 in the optical axis direction.
The inclined inner gear 69d, the pinion 66, the gear train 65, the rotation transmission shaft 61, the take-out pinion 62, and the rotation transmission mechanism 68 including the circumferential inner gear 13e are used to drive the second
It is transmitted to the rotary cylinder 13.

In the present zoom lens barrel having the above structure, when the third rotary barrel 69 is rotationally driven by the driving of the motor, the third straight barrel 60, the straight guide pin 60b, and the lead groove 69.
By being guided by c and the straight-movement guide groove 67e, it moves straight in the optical axis direction without rotating. At this time, the second rotary cylinder 13 is rotated by transmitting the rotation of the third rotary cylinder 69 and moves in the optical axis direction while rotating due to the relationship between the male helicoid 13f and the female helicoid 60a. The cylinder 14 moves in the optical axis direction without rotating. At this time, the rotation of the second rotary cylinder 13 is transmitted to the first rotary cylinder 15, and the first rotary cylinder 15 moves in the optical axis direction while rotating.
The rectilinear barrel 22 moves in the optical axis direction without rotating.
The front group lens L1 moves in the optical axis direction together with the first rectilinear barrel 22, and the rear group lens L2 has a relationship between the rectilinear guide protrusion 24a and the rectilinear key 16b, and the guide pin 24b and the first rotary cylinder 15.
It moves in the optical axis direction without rotating due to the relationship with the cam groove 15f on the inner circumference. Therefore, the front lens group L1 and the rear lens group L2, which are the movable variable power lens groups of the front and rear two groups, can move linearly while performing the zooming while changing the air gap between them.

As described above, in the zoom lens barrels according to the first and second embodiments of the present invention, the first rotary barrel 15, the second rotary barrel 13, the third rotary barrel 69 to which rotation is applied, and the optical axis. The first straight-moving barrel 22 and the second straight-moving barrel 1 which can only move in the straight direction
4. By repeating the predetermined relationship by the third rectilinear barrel 60, the number of feeding stages can be increased infinitely.

[0026]

As described above, according to the present invention, in the multi-stage extension zoom lens barrel, the total length during storage can be greatly shortened, and the miniaturization of the camera can be easily realized. A zoom lens barrel can be obtained.

[Brief description of drawings]

FIG. 1 is an overall schematic longitudinal upper half view showing a first embodiment of a zoom lens barrel according to the present invention in its longest extended state.

FIG. 2 is a vertical cross-sectional view showing the zoom lens barrel in a housed state.

FIG. 3 is an overall schematic vertical upper half diagram showing a second embodiment of the zoom lens barrel according to the present invention in its longest extended state.

[Explanation of symbols]

13 2nd rotary cylinder (rotary cylinder, first rotary advance / retreat cylinder) 14 2nd straight advance cylinder (first straight advance cylinder) 15 1st rotary cylinder (rotary cylinder, second rotary advance / retreat cylinder) 22 1st straight advance cylinder ( 2nd rectilinear barrel) 48 68 Rotation transmission mechanism 60 3rd rectilinear barrel 69 3rd rotary barrel (rotary barrel) L1 Front group lens (movable variable lens group) L2 Rear group lens (movable variable lens group)

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G02B ⁷ /02-7/16 G03B 17/04

Claims (9)

(57) [Claims] 1. A rotary cylinder to which rotation is applied, and a rotary cylinder of the rotary cylinder.
It is supported inside so that it can only move straight in the direction of the optical axis.
The rotation force of the cylinder is used as a drive source in the optical axis direction with respect to the rotation cylinder.
Each has a straight-moving barrel that moves relative to each other and is adjacent in the radial direction.
Was a plurality of telescoping barrel unit provided coaxially; supported in movable barrel unit located on the most inner diameter side, small
At least two front and rear movable zoom lens groups; and adjacent in the radial direction
On the inner peripheral surface of the pair of rotating barrels of the pair of feeding barrel units.
Each of the inner gear formed and the inner
At the center of rotation parallel to the optical axis
A pair of rotatable pinions and the above-mentioned pair of delivery cylinder units.
Pinion regardless of the relative position change of the optical axis
With a rotation transmission shaft that transmits the rotation of the other to the other
A rotation transmission mechanism; and a pair of the delivery cylinder units by the rotation transmission mechanism.
Transmitting the rotational force of one rotary cylinder of the knit to the other rotary cylinder
Multistage feeding zoom lens barrel, characterized in that that. 2. The multi-stage feeding zoom lens mirror according to claim 1.
In the cylinder, one of the pair of delivery cylinder units goes straight
By restricting the movement in the optical axis direction with respect to the tube, the pair of pinion
It supports one of the
To maintain meshing with the one pinion when moving
In addition, the inner gear is spirally formed on the inner peripheral surface of the rotary cylinder.
This is a multi-stage zoom lens barrel. 3. The multi-stage feeding zoom according to claim 1 or 2.
In the lens barrel, the rotation transmission shaft is in the optical axis direction.
Has a uniform non-circular cross-sectional shape toward the, above Symbol pair Pini
One side is turned on in the optical axis direction on the outer surface of the rotation transmission shaft.
Multi-stage feeding zoom that is fitted so that it can move freely and cannot rotate relative to it
Mullens barrel. 4. The method according to any one of claims 1 to 3.
In the multi-stage feed zoom lens barrel , a plurality of the above feed barrels
At least one of the rotary barrels of the unit is a multi-stage feed zoom lens barrel which is a rotary forward / backward barrel that advances and retracts in the optical axis direction when given rotation. 5. The multi-stage feeding zoom lens mirror according to claim 4.
In the cylinder, the rotation advancing / retreating cylinder and the outside of the rotation advancing / retreating cylinder
The straight advancing barrel of another adjacent feeding barrel unit is Lycoid
A multi-stage extension zoom lens barrel that is connected via a lens. 6. The method according to any one of claims 1 to 5.
In the multi-stage extension zoom lens barrel, the above extension unit
Are rotatable relative to the above-mentioned rotary cylinder, and
Is a linear movement in the direction of the optical axis, which moves integrally with the rotary cylinder
A straight guide member capable of
The straight-ahead barrel of the outlet barrel unit is guided straight in the optical axis direction.
Multi-stage zoom lens barrel. 7. A multi-stage feeding zoom lens mirror according to claim 6.
In the cylinder, a pair of feeding cylinder units that are adjacent to each other in the radial direction are further provided.
Of the knit, the straight advance cylinder of the outside supply cylinder unit
Guide the linear guide member of the feeding cylinder unit in the optical axis direction.
Multi-stage zoom lens barrel that is used. 8. A first rotation advancing / retreating cylinder having an inner gear on its inner peripheral surface, which advances and retreats in the optical axis direction when given rotation; only linear movement in the optical axis direction inside said first rotation advancing / retreating cylinder.
Supported by the first rotation advancing / retreating cylinder .
A first straight- moving barrel that moves relative to the first rotating / retracting barrel in the optical axis direction; located inside the first straight- moving barrel and given rotation.
Inner circumference that moves relative to the first rectilinear barrel in the optical axis direction
Second rotation advancing / retreating cylinder having inner gear on its surface; only linear movement in the optical axis direction inside the second rotation advancing / retreating cylinder
Rotatably supported by the rotation of the second rotation advancing / retreating cylinder .
A second straight advance / retreat cylinder that moves relative to the second rotary advance / retreat cylinder in the optical axis direction ; and the first rotary advance / retreat cylinder and the second rotary advance / retreat cylinder.
Each of the inner gears always meshes with each other while rotating parallel to the optical axis.
A pair of pinions that can be rotated by the heart, and a pair of pinions
Despite the relative position change in the optical axis direction
Rotate the cylinder side pinion to the second rotation advance / retreat cylinder side pinion
A multi-stage extension zoom lens barrel, which is provided with a rotation transmission shaft for transmitting to a lens. 9. The multi-stage feeding zoom lens mirror according to claim 8.
In the cylinder, and a second retractable rotational cylinder and the second rectilinear tube, at least two front and rear groups multistage feeding zoom lens barrel movable lens groups is supported for.