JP2002287004A - Lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel which can smoothly move the front group lens and rear group lens of a lens barrel at their storage positions forward along the optical axis even when the tilt angle of a cam groove is made small. SOLUTION: This lens barrel is equipped with a front lens frame which supports and is guided straight along the optical axis, a rear group lens frame which supports the rear group lens, follower pins which are formed on the front and rear lens frames respectively, and a cam ring which has the cam groove that the follower pins of the front and rear lens frames engage and is driven to rotate; and the cam groove of the cam ring has a movement section for moving the front and rear lens frames along the optical axis and storage positions to which the front and rear lens frames are moved behind the movement section, and a selective straight guide mechanism which allows the rear group lens frame to rotate relatively to the front group lens frame guided straight nearby the storage position and disallows the front group lens frame and rear group lens frame to rotate relatively, but allows them to move relatively along the optical axis in the movement section except the peripheries of the storage positions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a lens barrel.

[0002]

2. Description of the Related Art As an example of a lens barrel,
The cam ring that is driven to rotate is formed with a cam groove in which the follower pins of the front group lens and the rear group lens engage, and the front group lens and the rear group lens are moved only in the optical axis direction by rotating the cam ring. In some cases, the front lens group and the rear lens group are moved in the optical axis direction or are moved to a storage position.

However, when the diameter of the cam ring is small, if the inclination angle of the cam groove is made small in order to smoothly move the front lens group and the rear lens group, the cam grooves of the front lens group and the rear lens group will not move together. If the front lens and rear lens at the respective storage positions are moved forward in the optical axis direction, the front lens and rear lens interfere with each other, The rear lens group does not move.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a lens barrel having a front lens group and a rear lens group, in which the front lens group and the rear lens group located at the respective storage positions are moved along the optical axis even if the inclination angle of the cam groove is moderated. It is an object of the present invention to obtain a lens barrel that can be smoothly moved forward in the direction.

[0005]

SUMMARY OF THE INVENTION A lens barrel of the present invention supports a front lens group and is guided straight forward in the optical axis direction; a rear lens frame supporting a rear lens group; A follower pin formed respectively; a cam ring which has a cam groove for engaging the follower pins of the front and rear lens frames and is driven to rotate; and the cam groove of the cam ring moves the front and rear lens frames in the optical axis direction. A moving section, and a storage position for moving the front and rear lens groups behind the moving section,
Between the front lens frame and the rear lens frame, in the vicinity of the storage position, the relative movement of the rear lens frame relative to the front lens frame that is guided straight ahead is allowed, and the moving section excluding the vicinity of the storage position is In a region including the lens unit, a selection straight guide mechanism is provided which allows only relative movement in the optical axis direction without permitting relative rotation between the front lens frame and the rear lens frame.

A shutter block is mounted on the rear lens frame, and a flexible printed circuit board for transmitting an operation signal can be guided rearward from the shutter block.

It is preferable to provide an elastic ring which engages with the flexible printed board and urges the flexible printed board away from the optical axis.

Further, the front group lens frame guided straight ahead includes:
On its inner peripheral surface, a rectilinear guide groove parallel to the optical axis and a rotation permissible portion in which the width of the tip of the rectilinear guide groove is increased in the circumferential direction are formed. It is preferable that a straight guide key that fits in the straight guide groove is formed near the position in the rotation permitting portion of the front lens frame, and in a region including the moving section except near the storage position.

An inner flange for supporting the front lens group is formed integrally with the front lens frame. When the rear lens frame is in the vicinity of the storage position, It is preferable that a part of the front end of the rear lens group frame including the straight guide key is formed with a circumferential opening projecting forward.

[0010] The moving section may be a zoom section in which the front and rear lens frames are moved in a zoom photographing section.

It is preferable that the rear group lens frame is rotated in the vicinity of the storage position in conjunction with the rotation of the cam ring.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Overall Description of Zoom Lens Barrel] The illustrated embodiment is an embodiment in which the present invention is applied to a zoom lens barrel for a digital still camera. As is clear from FIGS. 5 to 7, the lens system of the present embodiment is a three-group type having a first lens unit L1, a second lens unit L2, and a third lens unit L3 in order from the object side. The first lens unit L1 and the second lens unit L2 move on the optical axis while changing the air gap to perform zooming, and the third lens unit L3 performs focusing.

In the present zoom lens barrel, an element fixed to the camera body (a member that does not move linearly or rotationally in the optical axis direction) is a housing 1 shown in FIGS.
1, a shaft retainer 12 and a fixed ring 13. The housing 11 and the fixed ring 13 have a fixed flange 13a coupled to each other (the fixed flange of the housing 11 is not shown).
Are formed. The housing 11 includes an outer cylindrical portion 11b partially cut away, and a filter holding portion 11c on the optical axis.
And a low-pass filter 11d is fixed to the filter holding unit 11c. The low-pass filter 11d is
It is located in front of the solid-state imaging device 10a on the substrate 10 fixed in the camera body.

The fixed ring 13 is located inside the outer cylindrical portion 11b of the housing 11. The rotating ring 14 is located on the outer peripheral side of the fixed ring 13 (between the stationary ring 13 and the outer cylindrical portion 11b), and the cam ring 15 is located on the inner peripheral side.
The fixed ring 13 is formed with cam ring regulating cam grooves 13b (three at equal angular intervals in the circumferential direction) as through grooves. Follower pin 1 fixed radially outward to meat portion 15a
5b is fitted. On the other hand, on the inner peripheral surface of the rotating ring 14,
A rotation transmitting groove 14a into which the follower pin 15b is fitted.
Are formed.

FIG. 11 shows a developed shape of the rotation transmitting groove 14a and the cam ring regulating cam groove 13b. The rotation transmitting groove 14a is formed of a linear groove 14a1 parallel to the optical axis except for a base (an end on the camera body side), and an inclined groove 14a2 is formed at the base following the linear groove 14a1.
And a circumferential groove 14a3. The circumferential groove 14a3 is a section for assembly. On the other hand, the cam ring regulating cam groove 13b has a straight groove 13 in a direction parallel to the optical axis of the base.
b1, a shooting state transition groove portion 13b2 including an optical axis direction component and a circumferential direction component, and a zoom section groove portion 13b3 including only a circumferential direction component. Zoom section groove 13b3
Is a section for assembling.

The rotary ring 14 rotates between the storage position shown in FIG. 11 and a preparation section and a zoom section. That is, FIG.
, The rotating ring 14 rotates with respect to the fixed ring 13 which is fixed, so that the follower pin 15b is
In a state where the base portion 4a2 and the straight groove portion 13b1 are fitted (in a storage position, a state where the cam ring 15 is most retracted),
When the rotary ring 14 rotates, the follower pin 15b (cam ring 15) is pushed by the inclined groove 14a2 and the linear groove 13
It advances and retreats in the optical axis direction without rotating according to b1. When the rotating ring 14 rotates in a state (preparation section) in which the follower pin 15b is fitted in the linear groove portion 14a1 and the shooting state transition groove portion 13b2, the follower pin 15b (cam ring 15).
Rotates while moving in the optical axis direction according to the shooting state transition groove 13b2. Follower pin 15b is straight groove 14
When the rotary ring 14 rotates in a state where the a1 is fitted in the zoom section groove 13b3 (zoom section), the follower pin 15b (cam ring 15) rotates without moving in the optical axis direction according to the zoom section groove 13b3.

A gear 14b is formed on the outer peripheral surface of the rotary ring 14, and the gear 14b meshes with a pinion (not shown). The pinion is driven by a forward / reverse drive motor in the forward / reverse direction, and the cam ring 15 moves in the optical axis direction while receiving the rotation of the rotary ring 14 while rotating in the relationship shown in FIG. The operation of the cam ring 15 accompanying the rotation of the rotary ring 14 described above is based on the state where the cam ring 15 is most retracted, first, only straight ahead (straight groove portion 13b1), and moves in the optical axis direction along with the rotation ( The shooting state transition groove 13b2, the preparation section), and finally only the rotation (the zoom section groove 13b)
3, zoom section).

In the zoom lens barrel according to the present embodiment,
The rotating members are the rotating ring 14, the cam ring 15, and a barrier opening / closing ring 31, which will be described later. The frame 19 rotates slightly). Next, these rectilinear members and their guide mechanisms will be described. An outer lens frame ring (straight guide ring) 16 and an inner lens frame ring (straight guide ring) 17 are located between the fixed ring 13 and the cam ring 15 in order from the outside. The thick portion 15a of the cam ring 15 secures an annular space between the cam ring 15 and the fixed ring 13 for sandwiching the thin outer lens frame ring 16 and the inner lens frame ring 17. 15a is rotatably engaged with the inner peripheral surface of the fixed ring 13 so as not to cause harmful fall.

The outer lens frame ring 16 located just inside the fixed ring 13 is composed of a lens frame ring body 16r made of synthetic resin and a metal reinforcing ring 16x, and a rear end portion of the lens frame ring body 16r. A straight guide key 16b (three at equal angular intervals in the circumferential direction) protruding outward in the radial direction is formed in the thick portion 16a. The straight guide key 16b is provided on the inner surface of the fixed ring 13.
Is formed slidably in parallel with the optical axis. The metal reinforcing annular body 16x is bonded and fixed to the front outer peripheral surface of the thick part 16a at the rear end of the lens barrel ring body 16r, thereby making the outer lens barrel ring 16 thinner, and thus the entire zoom lens barrel. (Reducing the diameter).

The inner lens frame ring 17, like the outer lens frame ring 16, comprises a lens frame ring main body 17r made of synthetic resin and a metal reinforcing ring 17x. Metal reinforced ring 17x
Is adhered and fixed to the front outer peripheral surface of the thick portion 17a at the rear end of the lens frame ring body 17r, and contributes to the thinning of the inner lens frame ring 17 and the thinning (small diameter) of the entire zoom lens barrel. I have.

On the inner surface of the outer lens frame ring 16 (the lens frame ring body 16r), there are formed straight guide grooves 16c (three at equal angular intervals in the circumferential direction) parallel to the optical axis. 16
A linear guide key 17b protruding from the thick portion 17a at the rear end of the lens barrel ring body 17r is slidably fitted in c. A plurality of bayonet claws 16d projecting radially inward are formed at the rear end of the outer lens frame ring 16 (the lens frame ring body 16r). In addition, an annular groove 15c is formed to rotatably hold the bayonet claw 16d at a specific angular position. Due to the relationship between the bayonet claw 16d and the annular groove 15c, the cam ring 15 and the outer lens frame ring 16 are coupled so that they can be freely rotated relative to each other and move together in the optical axis direction without being separated at the used rotation position. are doing.

Furthermore, the inner mirror frame ring 17 (mirror frame ring body 17)
In (r), an inner flange 17c is formed at the front, and a lens block 40 and a barrier opening / closing ring 31, which will be described later, are fixed to the inner flange. Further, on the back surface of the inner flange 17c, there are formed straight guide bosses 17d (three at equal angular intervals in the circumferential direction) directed in a direction parallel to the optical axis. On the other hand, the first-group moving frame 18 is located immediately inside the inner lens frame ring 17, and the straight-moving portion is located at a position avoiding the lens opening of the inner flange 18b and the female screw portion 18d (described later). Straight guide holes 18a (three at equal angular intervals in the circumferential direction) into which the guide boss 17d is slidably fitted are formed (FIG. 6). The rectilinear guide hole 18a is formed as an oval hole that is long in the radial direction. In the fitting gap between the rectilinear guide boss 17d and the rectilinear guide hole 18a, the first group moving frame 18 is fitted to the inner peripheral surface of the cam ring 15 (described later) even with a slight clearance (play). Therefore, it is possible to guide the vehicle straight ahead with sufficient accuracy. Also, the first group moving frame 1
8 has a straight guide groove 18c in a direction parallel to the optical axis.
(Three at equal angular intervals in the circumferential direction) are formed.

On the inner surface of the first group moving frame 18, the second group moving frame 1
9 is fitted. A linear guide key 19a that fits into the linear guide groove 18c of the first group moving frame 18 is formed on the outer periphery of the distal end portion of the second group moving frame 19.

The above-mentioned fitting relationship and straight traveling guide relationship are as follows: in order from the outer peripheral side, the outer lens frame ring 16 is linearly guided by the fixed ring 13, and the inner lens frame ring 17 is linearly guided by the outer lens frame ring 16.
It can be understood that the first group moving frame 18 is guided straight to the inner lens frame ring 17 and the second group moving frame 19 is linearly guided to the first group moving frame 18. The rectilinear guide relationship with the moving frame 18 is performed from the front by the relationship between the rectilinear guide boss 17d protruding rearward from the front of the inner lens frame ring 17 and the rectilinear guide hole 18a of the first group moving frame 18. ing. Therefore, inside and outside of the cam ring 15,
It is not necessary to interpose another linear guide member, and the annular space between the inner lens frame ring 17 and the first-group moving frame 18 can be reduced, and the diameter can be reduced.

The first group moving frame 18 is formed with a female screw portion 18d for screwing the first group fixing frame 20 to which the first lens group L1 is fixed. The screwing position of the first group fixing frame 20 with respect to the female screw portion 18d is adjusted at the time of assembling, and is adhesively fixed after the adjustment. A shutter block 21 is inserted into the annular concave portion 19b of the second group moving frame 19,
1 is fixed to the second group moving frame 19 by screws (not shown). The light-shielding ring (sliding sheet holding ring) 19 c is fitted and fixed to the second group moving frame 19. Second lens unit L2
Is fixed to the second group moving frame 19 via the lens holding frame 19d, located at the center of the shutter block 21. After adjusting the position of the second lens group L2 with respect to the second-group moving frame 19, the lens pressing frame 19d is fixed by bonding. The shutter block 21 opens and closes the shutter blade 21a according to subject brightness information. A flexible printed circuit board (FP) for supplying an operation signal to the shutter block 21
C board 21b, as shown in FIG.
After being guided to the rear from the housing 1, it is folded forward, and further adheres to the outer periphery of the fixed ring 13 from the guide portion 28 having a cutout in a part of the fixed ring 13, and is then turned back.
1 outside. And when it grows to the maximum,
An elastic ring (rubber rubber) 29 whose front end is located behind the front end of the guide portion 28 and is locked by the hook 11f
A folded portion of the FPC board 21b is passed forward, and the elastic ring 29 urges the FPC board 21b away from the optical axis.
1b is prevented from sagging into the optical path.

The third lens unit L3 is fixed to the third unit frame 22. As shown in FIG. 4, the third group frame 22 is movably held in the optical axis direction along a pair of linear guide rods 22 a having one end fixed to the shaft retainer 12 and the other end fixed to the housing 10. The movement is controlled in the optical axis direction according to the subject distance information by a feed screw 24 that is driven to rotate forward and backward by a stepping motor.

For zooming, the first lens unit L1 (first unit moving frame 18), the second lens unit L2 (second unit moving frame 19), and the third lens unit L3 (third unit frame 22) change the air gap between each other. It is performed by moving it forward and backward in the optical axis direction. On the inner surface of the cam ring 15, there are formed lens group cam grooves C1 (three at circumferentially equal angular intervals). The first-group moving frame 18 and the second-group moving frame 19, whose rotation is restricted by the above-described straight guide relationship and can only move in the optical axis direction, are provided with the lens group cam groove C1.
As a result, it moves in the optical axis direction with the rotation of the cam ring 15. 8 to 10 show the developed shape of the lens group cam groove C1. In FIG. 8, the lens group cam groove C1 on the inner surface of the cam ring 15 is drawn by a broken line as shown in FIG.
In FIG. 10, the shape is drawn by a solid line for clarity. The cam groove C1 for the lens group is formed by forming cam profiles for the first lens group L1 and the second lens group L2 in a continuous bottomed profile,
At the storage position of the lens unit L2, the first lens unit L1 and the second
It is characterized in that the lens unit L2 is made free and can be stored close to the position where the lens frames come into contact with each other.

That is, the first group follower pin 18f protrudingly formed on the outer surface of the first group moving frame 18 (first lens group L1).
The second group follower pin 19f protruding from the outer surface of the second group moving frame 19 (the second lens group L2) is fitted in the lens group cam groove C1. The lens group cam groove C1, which is a single continuous groove, has a function of moving the first lens group L1 and the second lens group L2 along independent trajectories.
In the conventional lens barrel, independent cam grooves are required by the number of lens groups to be moved along independent trajectories.

In the present embodiment, the lens group cam groove C1 is
The first group zoom section C1Z1, in order from the insertion end C1e of the second group follower pin 18f, and the second group follower pin 19f.
2nd group zoom section C1Z2, 1st group storage plaza C1A1,
It has a second group storage space C1A2. Both ends of the first group zoom section C1Z1 are the first group tele position Z1T and the first group wide position Z1W, and both ends of the second group zoom section C1Z2 are the second group tele position Z2T and the second group wide position Z2W. is there. Storage plaza C1A1 for first group and storage plaza C for second group
1A2, as shown in the figure, a groove width in a direction parallel to the optical axis (left-right direction in the figure) is formed wider than grooves in other sections, and the first group follower pin 18f and the second group follower pin 19f has a freely movable space.
That is, the first group storage plaza C1A1 has a shape that is long in the circumferential direction of the cam ring, and the first group follower pin 18f can move in the optical axis direction by the screwing adjustment dimension of the first group fixed frame 20 with respect to the first group moving frame 18. Has a good clearance. The second group storage plaza C1A2 has a substantially triangular shape,
The second group follower pin 19f has such a clearance that it can move largely in the circumferential direction of the cam ring and in the optical axis direction.

The first group follower pin 18 of the first group moving frame 18
f and the follower pin 19f for the second group of the second group moving frame 19 at the storage rotation position of the cam ring 15, the storage space C1A1 for the first group.
And to be located in the storage plaza C1A2 for the second group, respectively.
The circumferential phase is determined. Storage plaza C1A for 1st group
1st and 2nd group storage plaza C1A2 is 1st group follower pin 1
8f and the follower pin 19f for the second group are not restrained. That is, the first group follower pin 18f, the second group follower pin 1
9f is a storage plaza C1A1 for the first group and a storage plaza C1 for the second group.
It can move in the direction of the optical axis in A2, and the clearance can minimize the storage length. In addition, regarding the storage plaza C1A1 for the first group, the female screw portion 18 of the first group frame 20 is used.
A clearance is provided that can sufficiently absorb a change in position when the follower pin 18f is stored by adjusting the screwing position with respect to d.

A spring center projection 17g (FIGS. 5 and 7) is formed on the inner flange 17c of the inner lens frame ring 17 at a circumferential position different from that of the linear guide boss 17d. A spring housing recess 18g is formed on the inner flange 18b of the spring 18 so as to correspond to the spring center projection 17g. A compression spring 30 is inserted between the spring center protrusion 17g and the spring housing recess 18g, and the first group moving frame 1
8 to move backward. Therefore, the first group moving frame 1
The first group fixed frame 20 supported by the first group 8 is moved by the clearance existing between the first group follower pin 18f and the first group storage space C1A1.
It can be retracted to the mechanical position abutting c). This mechanical contact position is indicated by the symbol P in FIGS. The second-group moving frame 19 can be retracted to a mechanical position in contact with the third-group frame 22 by a clearance existing between the second-group follower pin 19f and the second-group storage plaza C1A2. This mechanical contact position is indicated by the symbol Q in FIGS. For this reason,
The storage length of the first lens unit L1 and the second lens unit L2 can be reduced as compared with a conventional device in which the storage positions of the first lens unit L1 and the second lens unit L2 are strictly defined by cam grooves. Furthermore, the third group frame 22
Spring 23 pressing against nut on feed screw
Can be retracted to a position where it contracts mechanically with the housing 11. This mechanical contact position is indicated by the symbol R in FIGS. The upper half of FIGS. 5, 6, and 7 shows the first group fixed frame 20, the second group moving frame 19 (light-shielding ring 19c), and the third group frame 22.
And a housing position where the housing 11 is in mechanical contact. Note that the position of the first-group fixed frame 20 with respect to the first-group fixed frame 20 is moved back and forth by adjustment at the time of assembling. At the time of storage, the adjustment amount is absorbed by the spring 30, and the lens barrel in which the contact position indicated by PQR can be stored can be stored.

When the cam ring 15 rotates from the storage rotation position to the photographing position, the first group follower pin 18f in the first group storage plaza C1A1 is moved to the second group zoom section C1Z.
2, the first group zoom section C1Z1 is reached, and the second group follower pin 19f passes from the second group storage plaza C1A2 through the first group storage plaza C1A1 to the second group zoom section C1Z2. As described above, the zoom section C1Z2 for the second group for the follower pin 19f for the second group (the first lens group L1) is 1
For the group follower pin 18f (first lens group L1), it is a mere passage section from the storage position to the photographing position (zoom section), which reduces the number of cam grooves, facilitates arrangement, and reduces the inclination. Useful for.

The inner lens frame ring 17 is independent of the first-group moving frame 18, but has a locus substantially similar to that of the first-group moving frame 18.
Move in the optical axis direction. For this reason, on the outer surface of the cam ring 15, there are provided lens frame ring cam grooves C2 (FIG. 8, three at equal angular intervals in the circumferential direction) for moving the inner lens frame ring 17 guided straight forward and backward in the optical axis direction. The cam groove C2 for the lens frame ring is formed.
A follower pin 17f (FIG. 8) projecting from the inner surface of the inner lens frame ring 17 is fitted into the cam groove C2, and the developed shape of the cam groove C2 is very similar to the cam groove C1 for the lens group. The first group zoom section corresponding section C2Z1, the second group zoom section corresponding section C2Z2, and the barrier opening / closing section C2B are arranged in order from the insertion end C2e of 17f. The barrier opening / closing section C2B is a circumferential groove, and the cam ring 15 and the inner lens frame ring 17 rotate only relative to each other. 8, the lens group cam groove C1 and the lens frame ring cam groove C2 of the cam ring 15 are slightly displaced in the optical axis direction.
The follower pin 17f of the inner lens frame ring 17 fitted into the lens frame ring cam groove C2 and the follower pin 18f of the first group moving frame 18 fitted into the lens group cam groove C1 are arranged in a direction parallel to the optical axis.

As described above, the inner lens frame ring 1 exposed to the exterior
7 is guided in the optical axis direction by a different cam mechanism as a member separate from the first-group moving frame 18 so that the external force applied to the inner lens frame ring 17 is transmitted from the first-group moving frame 18 to the first lens group L1. This prevents the optical performance of the zoom lens from deteriorating due to the shift of the optical axis of the first lens unit L1 and the like.
Further, since the cam groove C1 for the lens group and the cam groove C2 for the lens frame ring, in which the shapes of the cam ring 15 are very similar, are slightly shifted in the optical axis direction, the thickness of the cam ring 15 can be increased. In addition, a radially inward force applied to the inner lens frame ring 17 is applied to the first group moving frame 18 via the first group follower pin 18f.
Can be received at Furthermore, since the follower pin 17f fitted in the lens frame ring cam groove C2 and the follower pin 18f fitted in the lens group cam groove C1 are arranged in a direction parallel to the optical axis, the directions separated from each other by the compression spring 30. Group moving frame 18 and second group moving frame 19 that are biased to move
And the spring force acting between the cam ring 15 and the relative rotational position of the cam ring 15 hardly changes.

A barrier block 40 is inserted and fixed to the inner surface of the reinforcing ring 17x of the inner lens frame ring 17, and the barrier block 40 and the inner flange 17c of the inner lens frame ring 17 are fixed.
Between them, a barrier opening / closing ring 31 is rotatably supported. A notch 15k is formed in the cam ring 15,
When the cam ring 15 rotates in the barrier opening / closing section C2B, the end face of the notch 15k is in contact with the driven surface 31a of the barrier opening / closing ring 31 to rotate the rotation transmitting surface 15d in a direction parallel to the optical axis. Has become. This cutout 15k
8, the cam grooves C1, C2 of the cam ring 15 as shown in FIG.
Is formed in a region avoiding the formation region of.

As shown in FIGS. 2 and 14, the barrier block 40 is rotatable about a barrier support frame 41 having a photographing opening 41a in the center and a pair of rotation center bosses 41b formed in the barrier support frame 41. A pair of supported barrier plates 4
2. A barrier closing spring (torsion spring) 43 for urging the pair of barrier plates 42 in the closing direction, and a barrier support frame 41
And a barrier mounting plate 44 that supports the barrier closing spring 43, and is sub-assembled as a separate unit in advance. A barrier boss 42 a (FIG. 12, FIG. 13) provided on the pair of barrier plates 42
And protrudes toward the barrier opening / closing ring 31 side from the escape groove 44a formed in the groove. The barrier opening / closing ring 31 is formed with a pair of opening / closing projections 31c that engage with the pair of barrier bosses 42a. 12 and 13 show the barrier block 40 as a virtual line.
FIG. 13 is a view indicated by (broken line), and shows a state in which the barrier opening / closing ring 31 closes the barrier (FIG. 12) and a state in which the barrier opening / closing ring 31 is open (FIG. 13). FIG. 14 is a view when the barrier block is mounted without the barrier support frame 41.

The barrier opening / closing ring 31 is stretched between a spring hook projection 31b formed on itself and a spring hook projection 17h formed on the inner lens frame ring 17 by a tension spring 45 stronger than the barrier closing spring 43. It is urged to rotate in the opening direction. The opening / closing projection 31c of the barrier opening / closing ring 31 is
At the rotation urging end by No. 5, the barrier plate 42 is opened by contacting the barrier boss 42a (FIG. 13). On the other hand, barrier opening / closing ring 3
1 is rotated against the force of the tension spring 45, the opening / closing projection 31c separates from the barrier boss 42a, and the pair of barrier plates 4
2 is closed by the force of the barrier closing spring 43 (FIG. 1).
2).

The barrier ring 3 against the force of the tension spring 45
1 is rotated by a rotation transmitting surface 15 d formed on the cam ring 15. Notch 3 formed in barrier opening / closing ring 31
The end surface of 1k is a driven surface 31a. When the cam ring 15 is in the storage position, the rotation transmitting surface 15 d of the cam ring 15
The driven surface 31 of the barrier opening / closing ring 31 passes through an opening (not shown) formed in the inner flange 17 c of the inner lens frame ring 17.
a, the barrier opening / closing ring 31 is rotated against the force of the tension spring 45, the barrier plate 42 is closed, and the cam ring 15 is moved relative to the inner lens frame ring 17 in the barrier opening / closing section C2B (FIG. 8). When rotating relative to each other, the rotation transmitting surface 15d is not in contact, the barrier opening / closing ring 31 is urged by the force of the tension spring 45, and the barrier plate 42 is opened.

FIG. 16 shows the movement of the rotation transmitting surface 15d when the cam ring 15 reaches the preparation section from the storage position. The cam ring 15 is provided with a cam ring regulating cam groove 13 of the fixed ring 13.
b, follower pin 15b, rotation transmitting groove 14 of rotating ring 14
a while moving in the direction of the optical axis in accordance with the relationship of FIG.
6, positions 5, 4, 3, and 2) and then rotate only (2, 1). When the rotation transmitting surface 15d moves from the section 2 to 1, the rotation transmitting surface 15d separates from the driven surface 31a of the barrier opening / closing ring 31 and opens the barrier plate 42. When the cam ring 15 reaches the storage position from the preparation section, the barrier plate 42 is closed by the movement of the rotation transmission surface 15d from the section 1 to the section 2 in the opposite manner.

The pair of barrier plates 42 are basically made of a flat plate, and the inner surfaces thereof are formed as shown in FIGS.
The convex surface L1r of the lens surface closest to the object in the first lens unit L1
Relief recesses 42b corresponding to the curvatures are formed. The escape recess 42b allows the inner lens frame ring 17 to be retracted to the limit during storage. This escape recess 42b
Is formed by a mold for resin-forming the barrier plate 42.

The above-described barrier block 40 is formed by fitting the inner lens frame ring 17 inside the reinforcing ring 17x and bonding the same.
It is fitted into the distal end opening of the reinforcing annular body 17x, and is engaged with a hook (not shown) provided on the inner lens frame ring 17 to prevent the reinforcing annular body 17x from coming off. The barrier opening / closing ring 31 is rotatably supported between the barrier block 40 and the inner flange 17c of the inner lens frame ring 17. The inner mirror frame ring body 17r made of synthetic resin has an open barrier plate 42 corresponding to the position of the barrier plate 42.
A notch 17k (FIG. 14) into which the hole enters is formed, and a reinforcing annular body 17x covers the outside of the notch 17k.
By providing a metal reinforcing ring 17x separate from the lens frame ring body 17r made of synthetic resin, a cutout 17k can be formed in the body 17r. If the barrier plates 42 of the barrier block 40 are stacked in a four-sheet configuration during storage, the radial length required for storage when the barrier is opened can be shortened, but the axial length requires a large amount, and one or two barrier plates are required. If so, the axial length can be shortened, but there is an unavoidable problem that the radial length requires a large amount. By forming the notch 17k for barrier escape in the inner lens frame ring 17 as in this embodiment, the axial length of the two-barrier configuration can be shortened, and the radial direction of the inner lens frame ring 17 can be reduced. The effect that the increase in length can be suppressed is obtained.

As described above, the zoom section groove 13b3 of the fixed ring 13 is a circumferential groove having no optical axis component, and the follower pin 15b of the cam ring 15 moves in the zoom section groove 13b3 ( In the zoom range, the cam ring 15 rotates only. In this photographing area, the follower pin 15b of the cam ring 15 and the zoom section groove 13b3
To remove backlash (play) between
2 is fitted to the tip of the rotating ring 14. A spring hook projection 32a and a spring hook projection 14c are formed on the urging ring 32 and the rotary ring 14, respectively. A tension coil spring 33 is stretched between the spring hook projection 32a and the spring hook projection 14c. And biases the biasing ring 32 rearward. As shown in FIGS. 1 and 4, three (equally circumferentially spaced) projections 3 are provided at the rear end of the inner circumferential surface of the biasing ring 32.
2c, and the projection 32c is
The three through holes 14d provided at the front end of the
4 penetrates from outside to inside. The through hole 14d is provided immediately before the rotation transmitting groove 14a, and the projection 32c is located in front of the follower pin 15b fitted in the rotation transmitting groove 14a. Abutting end surface 32b forming the rear end surface of projection 32c
When the follower pin 15b of the cam ring 15 reaches the zoom section groove 13b3 of the fixed ring 13, the follower pin 15b is brought into contact with the follower pin 15b to urge the follower pin 15b rearward to move the follower pin 15b to the zoom section groove 13b3. Abut the rear side of

In the above description, a straight guide groove 18c is formed on the inner surface of the first group moving frame 18 in a direction parallel to the optical axis.
The straight guide groove 18 is provided on the outer surface of the leading end of the second group moving frame 19.
Although the rectilinear guide key 19a is formed to fit into the rectilinear guide groove 18c, the rectilinear guide groove 18c is enlarged in the circumferential direction at the tip of the rectilinear guide groove 18c as shown in FIG. The rotation permitting portion 18h is formed, and the straight guide key 19a (the second group moving frame 19) is connected to the rotation permitting portion 18h.
Can rotate within. The rotation area of the second group moving frame 19 is 2
This is when the group moving frame 19 reaches the vicinity of the storage position, and the reason for allowing the rotation in this way is as follows. In addition, when the straight guide key 19a of the second group moving frame 19 is located inside the rotation permitting portion 18h (when the second lens L2 is near the storage position), the second group is moved to the inner flange 18b of the first group moving frame 18. A circumferential opening 18j provided at a front end of the moving frame 19 and having a projecting piece 19e including a straight guide key 19a projecting forward.
(FIGS. 3 and 6) are formed. By making the straight guide key 19a protrude forward from the inner flange 18b, the storage length can be reduced.

When the cam ring 15 rotates in the lens extension direction (the direction indicated by the arrow x in FIG. 10) in a state where the lens is stored and the first group follower pin 18f is located in the first group storage plaza C1A1. Since the first group follower pin 18f enters the second group zoom section C1Z2,
The group moving frame 18 moves forward in the optical axis direction. The movement positions of the first group follower pins 18f are shown as reference positions 1, 2, 3, and 4 in FIG. On the other hand, the cam ring 15
Is rotated in the x direction, the follower pin 19f for the second group located in the storage space C1A2 for the second group is left behind with respect to the cam ring 15 and the slope edge β from 1 in the storage square C1A2 for the second group. Move to the position 2 and contact the slope xx. When the cam ring 15 further rotates in the x direction, the cam ring 15 follows the slope xx of the oblique side edge β of the second group storage plaza C1A2.
The following motion of the group follower pin 19f in which the optical axis direction component and the circumferential direction component are mixed occurs. 1 group moving frame 1
8 moves forward on the optical axis, the side wall of the rotation permitting portion 18h is in contact with the straight guide key 19a, and the second group moving frame 19 is moved by the force of moving the first group moving frame 18 in the optical axis direction. While being pushed forward, the cam follower 19f rotates as it moves from the position 2 to the position 3 along the slope XX. That is, the straight guide key 19a is
While sliding on the side wall 8h, it moves toward the straight guide groove 18c. As described above, when the second-group moving frame 19 is relatively rotated with respect to the first-group moving frame 18, the first-group moving frame 18 can smoothly move forward without interfering with the second-group moving frame 19.

Eventually, the cam follower 19f comes into contact with one wall of the rectilinear guide groove 18C and stops rotating, and the rectilinear guide groove 18c of the first group moving frame 18 which advances in the optical axis direction.
When the first group guide ring 18 is further advanced, the straight guide key 19a is moved to the straight guide groove 18c.
to go into. Then, the straight guide key 19a is moved to the straight guide groove 18.
c, the rotation of the second-group moving frame 19 is restricted, and the second-group follower pin 19f moves on the slope xx of the inclined edge β from the position of 3 to the position of 4 this time.
The group frame 19 moves straight in the direction opposite to the moving direction of the first group frame (position 4). When the cam ring 15 further rotates, the follower pin 19f for the second group enters the storage space C1A1 for the first group, and in the subsequent rotation of the cam ring 15 in the x direction, the first group moves according to each section of the cam groove C1 for the lens group. The frame 18 and the second group moving frame 19 move straight in the optical axis direction (the second group moving frame 19 is guided straight to the first group moving frame 18). As described above, the substantially triangular second-group storage plaza C1A2 not only secures clearance for releasing the position regulation of the follower pin 19f in the optical axis direction during storage, but also forms the oblique edge β. Rotate the second group moving frame 19 to move straight ahead guide key 19
a is guided to the rectilinear guide groove 18c to a position where it can be engaged, and the first group frame 18 and the second group frame 19 are moved in opposite directions in the optical axis direction to ensure the engagement between the two. Has the function of

On the other hand, when the cam ring 15 rotates in the storage direction (the direction opposite to the arrow x in FIG. 10) from the photographing state, the follower pin 18f and the follower pin 19f are moved to the first group storage space C1A.
Return to the first and second group storage plazas C1A2. Here, the movement of the follower pin 19f will be specifically described. After passing through the first group storage plaza C1A1, the follower pin 19f moves upward in FIG. 10 along the bottom edge α shown in FIG. 9 of the second group storage plaza C1A2. Eventually, when the follower pin 19f comes to a position slightly before the end point α1 of the bottom edge α, the straight guide key 19a comes off the straight guide groove 18c to reach the rotation permitting portion 18h, and the second group moving frame 19 is moved to the first group moving frame. 18 is rotatable. Thereafter, the follower pin 19f reaches the end point α1 and rotates integrally with the cam ring 15 around the optical axis of the lens, that is, the second group moving frame 19 relatively rotates with the first group moving frame 18.
The follower pin 15b of the cam ring 15 is
13b1, the cam ring 15 retreats in the optical axis direction (moves rightward in FIG. 9), so that the follower pin 19f is finally located at the end point α2 in FIG. In this way, the first group moving frame 18 and the second group moving frame 19 move smoothly to the respective storage positions. Assuming a configuration in which the second group moving frame 19 is moved to the storage position only by the straight-ahead guide in the same manner as the first group moving frame 18, the cam groove C1 is set in the circumferential direction of the cam ring 15 (that is, above the end point α1 in FIG. 9). Must be formed longer, but if it is left as it is, it interferes with other formed cam grooves. Therefore, in order to avoid interference, the diameter of the cam ring 15 must be increased. However, according to the above embodiment, the cam groove for storing the second group moving frame 19 can be set short in the circumferential direction of the cam ring as long as it does not interfere with the other cam grooves. it can.

The two-group storage plaza C1A2 is formed in a substantially triangular shape as shown in the drawing, so that if it is formed in a straight line, the lens group cam groove C1, which is longer, can be made shorter. Thus, the lens group cam groove C1
Makes it possible to form the three lens group cam grooves C1 at the cam ring 15 at a gentle inclination angle. Further, since the second group storage space C1A2 having such a shape is provided, when the first group follower pin 18f and the second group follower pin 19f move forward from the storage position in the optical axis direction, the second group follower pin 19f is stored in the second group. Plaza C1A2
10 in the order of 1, 2, 3, and 4 in FIG.
The group moving frame 19 rotates relative to the first group moving frame 18. The first group moving frame 18 is provided with a rotation permitting portion 18 h that can rotate the linear guide key 19 a of the second group moving frame 19. is there.

FIG. 15 shows how the second group moving frame 19 rotates with respect to the cam ring. The first group moving frame 18 has a correspondence with the rotational position of the cam ring due to the lens group cam groove, whereas the second group moving frame 19 has a relative rotation with respect to the cam ring in the section R in FIG. Move.

As described above, when the first-group moving frame 18 and the second-group moving frame 19 are relatively rotated at the storage position, the first-group fixed frame 20 and the second-group moving frame 19 (light-shielding ring) supported by the first-group moving frame 18 are rotated. 19c), since the storage position is in mechanical contact with the contact position P, frictional resistance becomes a problem. In particular, since the first-group fixed frame 20 is screwed to the female screw portion 18d of the first-group moving frame 18, there is a possibility that the first-group fixed frame 20 is rotated and the position in the optical axis direction is deviated. Therefore, a low friction sheet, for example, a sliding sheet 26 made of tetrafluoroethylene resin is supported on the light-shielding ring 19c, and the rear end face of the first-group fixed frame 20 is brought into contact with the sliding sheet 26 (FIG. 5, 6,
7).

The overall operation from the storage position of the present zoom lens barrel having the above configuration to the photographing position (zoom position) is as follows. In the storage position, the first-group moving frame 18 urged backward by the force of the compression spring 30 causes the second-group moving frame 18 to move due to the clearance existing between the first-group follower pin 18f and the first-group storage plaza C1A1. 19 (shade ring 19
c) is retracted to the mechanical position where it contacts the second group moving frame 19
Is the follower pin 19f for the second group and the storage space C1A for the second group
3 group frame 22
To the mechanical position where it comes into contact with
Is retracted to a position where the spring 23 pressing on the nut attached to the feed screw contracts and mechanically contacts the housing 11. Due to these mechanical contacts, the storage length is reduced. In this storage position, the rotation transmitting surface 15d of the cam ring 15 pushes the driven surface 31a to rotate the barrier opening / closing ring 31 in the barrier closing direction against the force of the tension spring 45, and the opening / closing projection 31c is moved from the barrier boss 42a. Since they are separated, the barrier plate 42 closes the photographing opening 41a (FIG. 12).

When the rotary ring 14 rotates in the lens extending direction (preparation section in FIG. 11) from the stored state, the cam ring 15 having the follower pin 15b
3b1 and the inclined groove 14a2 of the rotary ring 14 allow only linear movement. Then, the followers 18f, 1f located in the storage plazas C1A1, C1A2 of the lens group cam groove C1.
9f is pushed by the end of the cam groove and moves forward,
As a result, the first-group moving frame 18 and the second-group moving frame 19 (light-shielding ring 19c) that are in mechanical contact move straight and release their mechanical contact with each other, and the second-group moving frame 19 and the third-group frame 22 The mechanical contact with is released.

When the rotating ring 14 further rotates in the lens extending direction, the cam ring 15 moves to the photographing state transition groove 1 of the fixed ring 13.
By 3b2, it moves in the optical axis direction with rotation, and eventually reaches the zoom section groove 13b3. At the initial stage of rotation of the cam ring 15 by the photographing state transition groove 13b2, the rotation transmitting surface 15d of the cam ring 15 separates from the driven surface 31a of the barrier opening / closing ring 31, and the barrier opening / closing ring 31 is moved by the force of the tension spring 45. It turns in the opening direction and opens the barrier plate 42 against the force of the barrier closing spring 43. Further, before and after the barrier opening operation, the first group moving frame 18 relatively rotates with respect to the second group moving frame 19, and the first group fixed frame 20 slides on the sliding sheet 26.

Next, when the follower pin 15b of the cam ring 15 reaches the zoom section groove 13b3 by the rotation of the rotary ring 14 in the same direction, the contact end face 32 at the rear end of the biasing ring 32 is moved.
b comes into contact with the follower pin 15b. Since the urging ring 32 is urged rearward by the tension spring 32, the follower pin 15b is brought into contact with the rear surface of the zoom section groove 13b3 via the contact end surface 32b. Follower pin 1
This relationship is maintained while 5b is located in the zoom section groove 13b3. As long as the cam ring 15 is rotated through the rotating ring 14 in the zoom section of FIG.
The backlash for the fixed ring 13 of 5 is eliminated.

When the cam ring 15 rotates from the storage rotation position to the zoom section through the preparation section as described above, the cam ring 1
5, the first group follower pin 18f in the first group storage plaza C1A1 passes through the second group zoom section C1Z2 to the first group zoom section C1Z1, and the second group follower pin 19f reaches the second group zoom section C1Z2. . When the cam ring 15 rotates in the zoom sections C1Z1 and C2Z2, the first group moving frame 18 (first lens group L1) and the second group moving frame 19 (second
The lens group L2) moves in a predetermined positional relationship in the optical axis direction according to the cam profile, and the combined focal length with the third lens group L3 changes. This zooming is performed by a well-known zoom switch (not shown). When the shutter release button is pressed, the stepping motor rotates by an angle (the number of rotations) corresponding to the subject distance information, and moves the third lens group L3 (the third group frame 22), which is the focus lens group, in the optical axis direction. And focus on the subject. Further, the shutter block 21 opens and closes the shutter blade 21a according to the subject luminance information.

When the first group moving frame 18 moves straight, the inner lens frame ring 17 is moved by the cam groove C2 having a shape similar to the cam groove C1 for regulating the position of the first group moving frame 18. It moves in the optical axis direction without changing the relative position with respect to the frame 18. The outer lens frame ring 16 always moves together with the cam ring 15 in the optical axis direction due to the relationship between the bayonet claw 16d and the annular groove 15c. Both the frame rings 17 move straight in the optical axis direction.

When the cam ring 15 rotates from the zoom section to the storage position, the outer lens frame ring 16 and the inner lens frame ring 17 are both moved rearward in the optical axis direction by the reverse operation to move one group. The frame 18 (first lens group L1) and the second group moving frame 19 (second lens group L2) are located at the retracted ends of the compression springs 30 and come into contact with each other.
The filter holding portion 11c is mechanically in contact with the group frame 22 and is pressed by a spring 23 pressed against a nut attached to the feed screw.
Retreat until you hit. Further, the rotation transmitting surface 15d of the cam ring 15 pushes the driven surface 31a to rotate the barrier opening / closing ring 31 in the barrier closing direction against the force of the tension spring 45, and the barrier plate 42 closes the photographing opening 41a.

[0057]

DESCRIPTION OF THE FEATURES OF THE PRESENT INVENTION The features of the present invention include a front lens frame supporting the front lens group and guided straight in the optical axis direction, a rear lens frame supporting the rear lens group, and A follower pin formed on each of the front and rear lens frames, and a cam ring which has a cam groove for engaging the follower pins of the front and rear lens frames and is driven to rotate, and the cam groove of the cam ring,
It has a moving section for moving the front and rear lens frames in the optical axis direction, and a storage position for moving the front and rear lens groups behind this moving section, between the front group lens frame and the rear group lens frame, In the vicinity of the storage position, the relative rotation of the rear group lens frame with respect to the front group lens frame guided straight ahead is allowed. The point is that a selective straight guide mechanism that allows only relative movement in the optical axis direction without allowing movement is provided.

Further, a shutter block is mounted on the front lens group frame, and a flexible printed board for transmitting an operation signal is guided rearward from the shutter block. In addition, a point where an elastic ring is provided to urge the flexible printed circuit board in a direction away from the optical axis, the front group lens frame guided straight, the inner peripheral surface thereof has a A rotation permissible portion is formed in which the width of the front end portion of the rectilinear guide groove is widened in the circumferential direction. In a region including the moving section excluding the vicinity of the storage position, a linear guide key that fits into the linear guide groove is formed. The front lens frame includes an inner flange for supporting the front lens. When the rear lens group frame is in the vicinity of the storage position, a part of the front end of the rear lens group frame including the rectilinear guide key is formed on the inner flange so that a circumferential opening protrudes forward. Is formed, and the moving section can be a zoom section in which the front and rear lens frames are moved in the zoom photographing section, and the rear lens frame rotates the cam ring near the storage position. The feature of the present invention is that it rotates in conjunction with driving. Hereinafter, this characteristic portion will be described. Note that the selected straight guide mechanism of the present embodiment includes a straight guide groove 18c, a rotation permitting portion 18h, and a straight guide key 19a.

The fixed ring 13 is located inside the outer cylindrical portion 11b of the housing 11. The rotating ring 14 is located on the outer peripheral side of the fixed ring 13 (between the stationary ring 13 and the outer cylindrical portion 11b), and the cam ring 15 is located on the inner peripheral side.
The fixed ring 13 is provided with cam ring regulating cam grooves 13b (three at equal angular intervals in the circumferential direction) formed as through grooves. A follower pin 15a fixed outward is fitted. On the other hand, a rotation transmitting groove 14a for fitting the follower pin 15a is formed on the inner peripheral surface of the rotating ring 14.

A gear 14b is formed on the outer peripheral surface of the rotary ring 14, and the gear 14b is engaged with a pinion (not shown). The pinion is driven by a forward / reverse drive motor in the forward / reverse direction, and the cam ring 15 moves in the optical axis direction while receiving the rotation of the rotary ring 14 while rotating in the relationship shown in FIG.

Inside the cam ring 15, the first lens unit L1
The first group moving frame 18 to which the first group frame 20 is fixed is located, and an inner flange 18b of the first group moving frame 18 is provided.
The first group moving frame 18 is moved in the optical axis direction by a rectilinear guide mechanism (a rectilinear guide boss 17d and a rectilinear guide hole 18a) provided between the cam ring 15 and the inner lens frame ring 17 provided outside. Can be. On the inner surface of the first group moving frame 18, there are formed straight guide grooves 18c (three at equal angular intervals in the circumferential direction) in a direction parallel to the optical axis. As shown in FIG. 5, a rotation permissible portion 18h is formed by enlarging the rectilinear guide groove 18c in the circumferential direction. The inner flange 18b is provided with three circular openings 18e at equal angular intervals in the circumferential direction.

On the inner surface of the first group moving frame 18, the second group moving frame 1
9 is fitted. On the outer periphery of the leading end of the second group moving frame 19, the straight guide groove 18c of the first group moving frame 18 and the rotation permitting portion 1 are formed.
A straight guide key 19a that can fit into 8h is formed. Further, at the front end of the second group moving frame 19, three arc-shaped projecting pieces 19e including a straight guide key 19a are formed at equal angular intervals in the circumferential direction.

Behind the first group moving frame 18, the second group moving frame 19
Is located in the second group moving frame 19,
A shutter block 21 is inserted into 9b, and the shutter block 21 is fixed to the second group moving frame 19 by screws (not shown). Further, the light-shielding ring 19c is
And is fixed. The second lens unit L2 is located at the center of the shutter block 21, and is fixed to the second unit moving frame 19 via the lens pressing frame 19d. The lens holding frame 19d is the second group moving frame 19 of the second lens unit L2.
After adjusting the position with respect to, it is adhesively fixed. Flexible printed circuit board (FPC board) for shutter block 21
Is connected to the rear end of the housing 11, and opens and closes the shutter blade 21a in accordance with subject brightness information. Shutter block 21
As shown in FIG. 7, the FPC board 21 b that gives an operation signal to the shutter 28 is guided backward from the shutter block 21, then folded forward, and further has a guide portion 28 having a cutout in a part of the fixed ring 13. After being adhered to the outer periphery of the fixed ring 13 and folded back, it is guided to the outside of the housing 11. An elastic ring (a rubber band) whose front end is located rearward of the front end of the guide portion 28 when it is extended to the maximum.
A front folded portion of the FPC board 21b is passed through the FPC board 29b. The elastic ring 29 urges the FPC board 21b in a direction away from the optical axis, and the FP in the shooting state.
This prevents the C board 21b from sagging into the optical path.

The zooming is performed by moving the first lens unit L1 (first unit moving frame 18) and the second lens unit L2 (second unit moving frame 19) in the optical axis direction while changing the air gap between them. On the inner surface of the cam ring 15, there are formed lens group cam grooves C1 (three at circumferentially equal angular intervals). The first-group moving frame 18 and the second-group moving frame 19 whose rotation is restricted by the above-described rectilinear guide relation and can only move in the optical axis direction are moved by the lens group cam groove C1 along with the rotation of the cam ring 15 due to the rotation of the cam ring 15. Move in the direction. The cam groove C1 for the lens group forms a cam profile for the first lens group L1 and a cam profile for the second lens group L2 in a continuous profile.

That is, the first group follower pin 18f protrudingly formed on the outer surface of the first group moving frame 18 (first lens group L1).
The second group follower pin 19f protruding from the outer surface of the second group moving frame 19 (the second lens group L2) is fitted in the lens group cam groove C1. The lens group cam groove C1, which is a single continuous groove, has a function of moving the first lens group L1 and the second lens group L2 along independent trajectories.

In the present embodiment, the cam groove C1 for the lens group is 1
The first group zoom section (moving section) C1Z1 and the second group zoom section (moving section) C1Z in order from the insertion end C1e of the group follower pin 18f and the second group follower pin 19f.
2, 1st group storage plaza C1A1, 2nd group storage plaza C1A2
And Both ends of the first group zoom section C1Z1 are 1
Both ends of the group tele position Z1T, the first group wide position Z1W, and the second group zoom section C1Z2 are located at the second group tele position Z2T.
And the second group wide position Z2W. Storage plaza C1 for first group
As shown, the A1 and the second group storage plaza C1A2 are formed such that the groove width in the direction parallel to the optical axis (the left-right direction in the figure) is wider than the grooves in the other sections. The follower pin 18f has a space in which the second group follower pin 19f can freely move.

The follower pin 18 for the first group of the first frame moving frame 18
f and the follower pin 19f for the second group of the second group moving frame 19 at the storage rotation position of the cam ring 15, the storage space C1A1 for the first group.
And to be located in the storage plaza C1A2 for the second group, respectively.
The circumferential phase is determined. Storage plaza C1A for 1st group
1st and 2nd group storage plaza C1A2 is 1st group follower pin 1
8f and the follower pin 19f for the second group are not restrained. That is, the first group follower pin 18f, the second group follower pin 1
9f is a storage plaza C1A1 for the first group and a storage plaza C1 for the second group.
It can move in the optical axis direction and the circumferential direction within A2.

In this embodiment, the second group moving frame 1
When 9 reaches the vicinity of the storage position, the rectilinear guide key 19a can rotate in the rotation permitting portion 18h, and the reason for permitting the rotation is as follows.

When the cam ring 15 is rotated in the lens extension direction (the direction indicated by the arrow x in FIG. 10) when the first group follower pin 18f is located in the first group storage plaza C1A1 when the lens is stored. Since the first group follower pin 18f enters the second group zoom section C1Z2,
The group moving frame 18 moves forward in the optical axis direction. The movement positions of the first group follower pins 18f are shown as reference positions 1, 2, 3, and 4 in FIG. On the other hand, the cam ring 15
Is rotated in the x direction, the follower pin 19f for the second group located in the storage space C1A2 for the second group is left behind with respect to the cam ring 15 and moves from the position 1 to 2 in the storage space C1A2 for the second group. Then, it comes into contact with the slope xx. At this time, since the second-group moving frame 19 is relatively rotated with respect to the first-group moving frame 18 whose rotation is restricted, the straight-ahead guide key 19a rotates in the rotation permitting portion 18h, and the first-group moving frame 18 is moved along the optical axis. Move forward in the direction. As described above, when the second group moving frame 19 is relatively rotated with respect to the first group moving frame 18, the first group moving frame 18 is rotated.
Can smoothly move forward without interfering with the second group moving frame 19.

When the cam ring 15 further rotates in the x direction,
In accordance with the slope xx, a motion in which the optical axis direction component and the circumferential direction component are mixed occurs in the second group follower pin 19f (2, 3,
4) Eventually, the straight guide key 19a is turned into the straight guide groove 18c.
It fits inside. In this state, follower pin 1 for the second group
9f enters the storage plaza C1A1 for the first group and the cam ring 1
In the rotation in the x direction of 5, the first group moving frame 18 and the second group moving frame 19 move straight in the optical axis direction according to each section of the lens group cam groove C1.

On the other hand, when the cam ring 15 rotates in the storage direction (the direction opposite to the arrow x in FIG. 10) in the photographing state, the follower pin 18f and the follower pin 19f move to the storage space C for the first group.
Return to 1A1 and 2nd group storage plaza C1A2. Here, the movement of the follower pin 19f will be specifically described. The follower pin 19f, after passing through the first-group storage plaza C1A1, moves upward in FIG. 9 along the bottom edge α of the second-group storage plaza C1A2 shown in FIG. Eventually, when the follower pin 19f comes to a position slightly before the end point α1 of the bottom edge α (see the attached drawing), the rectilinear guide key 19a comes off the rectilinear guide groove 18c and reaches the rotation permitting portion 18h. Then, the second group moving frame 19 becomes rotatable relative to the first group moving frame 18. Thereafter, the follower pin 19f reaches the end point α1 and rotates integrally with the cam ring 15 around the optical axis of the lens.
It rotates relative to the group moving frame 18. Then, the follower pin 15b of the cam ring 15 is guided by 13b1 of the fixed ring 13, and the cam ring 15 retreats (moves rightward in FIG. 9). It is located at the middle end point α2. In this way, the first group moving frame 1
The 8th and 2nd group moving frames 19 move smoothly to the respective storage positions. Assuming a configuration in which the second group moving frame 19 is moved to the storage position only by the straight-ahead guide in the same manner as the first group moving frame 18, the cam groove C1 is set in the circumferential direction of the cam ring 15 (that is, above the end point α1 in FIG. 9). Must be formed longer, but if it is left as it is, it interferes with other formed cam grooves. Therefore, in order to avoid interference, the diameter of the cam ring 15 must be increased. However, according to the above embodiment, the cam groove for storing the second group moving frame 19 can be set short in the circumferential direction of the cam ring as long as it does not interfere with the other cam grooves. it can.

Further, since the FPC board 21b is connected to the shutter block 21 which rotates with the second group moving frame 19, when the second group moving frame 19 rotates, the FPC board 21b is twisted. Since the subject brightness information is not damaged even if it is touched, it is possible to reliably transmit the subject brightness information to the shutter block 21 and open and close the shutter blade 21a.

Further, as shown in FIG.
When the 8th and 2nd group moving frames 19 are stored in the storage positions, the projecting pieces 19e are loosely fitted into the openings 18e, and the projecting pieces 19e
Since the first-group moving frame 18 moves rearward until it protrudes forward of e, the first-group moving frame 18 and the second-group moving frame 19 can be stored as compactly as possible.

In this embodiment, the rectilinear guide groove 18c and the rotation permitting portion 18h are provided on the first group moving frame 18, and the rectilinear guide key 19a is provided on the second group moving frame 19.
And the rotation permitting section 18 h may be provided on the second group moving frame 19, and the straight guide key 19 a may be provided on the first group moving frame 18.

The elastic ring 29 is not limited to rubber bands, but may be any elastic ring.

Although the lens barrel of the illustrated embodiment is a zoom lens barrel, the present invention can be applied to a lens barrel of a single focus collapsible camera. In addition, the first group moving frame 1
The rectilinear guide mechanism of the 8 and 2 group moving frame 19 and the inner lens frame ring 17 is an example, and the present invention relates to a lens group and an inner mirror guided by the lens group cam groove C1 and the lens frame ring cam groove C2. The linear guide mechanism of the frame ring 17 does not matter. Also,
The cam groove C1 for the lens group and the cam groove C2 for the lens frame ring are formed three in the circumferential direction in the illustrated example, but theoretically one or more may be used.

[0077]

According to the present invention, in a lens barrel having a front lens group and a rear lens group, the front lens group and the rear lens group at the respective storage positions can be set even if the inclination angle of the cam groove is moderate. It can be moved smoothly forward in the optical axis direction.

[Brief description of the drawings]

FIG. 1 is an overall exploded perspective view showing an embodiment of a zoom lens barrel according to the present invention.

FIG. 2 is an enlarged perspective view of an upper portion of the zoom lens barrel of FIG. 1;

FIG. 3 is an enlarged perspective view of a middle portion of the zoom lens barrel shown in FIG. 1;

FIG. 4 is an enlarged perspective view of a lower portion of the zoom lens barrel in FIG. 1;

FIG. 5 is a longitudinal sectional view of the zoom lens barrel of the present invention in a housed state.

FIG. 6 is a longitudinal sectional view of a stored state of the zoom lens barrel of the present invention at a sectional position different from FIG. 5;

FIG. 7 shows a state in which the upper half of the zoom lens barrel according to the present invention is housed,
It is a longitudinal cross-sectional view showing a lower half as a shooting state.

FIG. 8 is a development view of a cam ring.

FIG. 9 is a developed view showing a shape of a lens group cam groove of a cam ring.

FIG. 10 is a development view showing a relationship between a lens group cam groove of a cam ring and a first group moving frame follower pin and a second group moving frame follower pin.

FIG. 11 is a development view of a cam ring regulating cam groove of a fixed ring and a rotation transmission groove of a rotating ring in which a follower pin of the cam ring is fitted.

FIG. 12 is a cross-sectional view of a barrier closed state around a barrier opening / closing ring for driving a barrier block.

FIG. 13 is a sectional view of the barrier in an open state.

FIG. 14 is a cross-sectional view showing the relationship between the barrier of the barrier block and the outer lens frame.

FIG. 15 is a graph illustrating optical axis positions of a first lens group (first group moving frame) and a second lens group (second group moving frame) in a zoom section and a storage section.

FIG. 16 is a development view showing a positional relationship between a cam ring and a barrier opening / closing ring.

FIG. 17 is an enlarged perspective view of a barrier plate.

[Explanation of symbols]

 L1 First lens group L2 Second lens group L3 Third lens group 10 Substrate 10a Solid-state imaging device 11 Housing 11b Outer cylindrical portion 11c Filter holding portion 11d Low-pass filter 12 Shaft retainer 13 Fixed ring 13a Fixed flange 13b Cam ring regulating cam groove 13b1 Straight groove 13b2 Shooting state transition groove 13b3 Zoom section groove 13b4 Assembly groove 13c Straight guide groove 14 Rotary ring 14a Rotation transmission groove 14a1 Linear groove 14a2 Inclined groove 14a3 Circumferential groove 14b Gear 14c Spring hooking hole 14d Ring 14a Thick portion 15b Follower pin 15c Annular groove 15d Rotation transmitting surface 15k Notch 16 Outer lens frame ring 16r Lens frame ring main body 16a Thick portion 16b Straight guide key 16c Straight guide groove 16d Bayonet claw 16f Escape groove 6x Reinforced annular body 17 Inner lens frame ring 17r Lens frame ring main body 17a Thick wall portion 17b Straight guide key 17c Inner flange 17d Straight guide boss 17f Follower pin 17g Spring center protrusion 17h Spring hook protrusion 17j Follower seat 17k Notch 17j Follower seat Annular body 18 1st group moving frame 18a Straight guide hole 18b Inner flange 18c Straight guide groove 18d Female screw portion 18f 1st group follower pin 18g Spring receiving recess 18h Rotation permissible portion 18j Opening 19 2nd group moving frame 19a Straight guide key 19b Annular recess 19c Shield ring 19f Follower pin for second group 20 First group fixed frame 21 Shutter block 21a Shutter blade 21b FPC board 22 Third group frame 22a Straight guide rod 23 Spring 24 Feed screw 26 Slide sheet 28 Guide plate 29 Elastic ring (ring) Rubber) 30 compression spring 31 barrier opening / closing ring 31a driven surface 31b spring hook projection 31c opening / closing projection 31k notch 32 urging ring 32a spring hook projection 32b contact end face 32c projection 33 tension spring 40 barrier block 41 barrier support frame 41a shooting opening 41b Rotation center boss 42 Barrier plate 43 Barrier closing spring 44 Barrier mounting plate 45 Tension spring C1 Lens group cam groove C1Z1 Group 1 zoom section C1Z2 Group 2 zoom section C1A1 Group 1 storage plaza C1A2 Group 2 storage plaza Z1T Group 1 Tele position for Z1W Wide position for 1st group Z2T Tele position for 2nd group Z2W Wide position for 2nd group C2 Lens frame cam groove C2Z1 1st group zoom section C2Z2 2nd group zoom section C2B Barrier opening / closing section

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[Procedure amendment]

[Submission date] April 5, 2002 (2002.4.5)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

Furthermore, the inner mirror frame ring 17 (mirror frame ring body 17)
r) has an inner flange 17c formed at the front thereof, and a barrier block 40 and a barrier opening / closing ring 31, which will be described later, are fixed to the inner flange 17c . Further, on the back surface of the inner flange 17c, there are formed straight guide bosses 17d (three at equal angular intervals in the circumferential direction) directed in a direction parallel to the optical axis. On the other hand, on the inner side of the inner lens frame ring 17 1
The group moving frame 18 is located and its inner flange 18b
A straight guide hole 18a (three at equal angular intervals in the circumferential direction) into which the straight guide boss 17d is slidably formed is formed at a position avoiding the lens opening and the female screw portion 18d (described later). (FIG. 6). The rectilinear guide hole 18a is formed as an oval hole that is long in the radial direction. In the fitting gap between the rectilinear guide boss 17d and the rectilinear guide hole 18a, the first group moving frame 18 is fitted to the inner peripheral surface of the cam ring 15 (described later) even with a slight clearance (play). Therefore, it is possible to guide the vehicle straight ahead with sufficient accuracy. In addition, on the inner surface of the first group moving frame 18, a straight guide groove 18c in a direction parallel to the optical axis is provided.
(Three at equal angular intervals in the circumferential direction) are formed.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0027

[Correction method] Change

[Correction contents]

For zooming, the first lens unit L1 (the first unit moving frame 18) and the second lens unit L2 (the second unit moving frame 19 ) are moved forward and backward in the optical axis direction while changing the air gap between each other. Do it. A cam groove C1 for the lens group is provided on the inner surface of the cam ring 15.
(Three at equal angular intervals in the circumferential direction) are formed. The first-group moving frame 18 and the second-group moving frame 19 whose rotation is restricted by the above-described rectilinear guide relation and can only move in the optical axis direction are moved by the lens group cam groove C1 along with the rotation of the cam ring 15 due to the rotation of the cam ring 15. Move in the direction. 8 to 10 show the developed shape of the lens group cam groove C1. In FIG. 8, the lens group cam groove C1 on the inner surface of the cam ring 15 is drawn by broken lines as shown in FIGS. Are drawn with solid lines for clarity. The cam groove C1 for the lens group is provided in the continuous profile having the bottom with the first lens group L1 and the second lens group.
At the point where the cam profile for the lens unit L2 is formed and at the storage position of the first lens unit L1 and the second lens unit L2, the first lens unit L1 and the second lens unit L2 are free, and the lens barrels come into contact with each other. It is characterized in that it can be stored close to the position.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction contents]

A spring center projection 17g (FIGS. 5 and 7) is formed on the inner flange 17c of the inner lens frame ring 17 at a circumferential position different from that of the linear guide boss 17d. A spring housing recess 18g is formed on the inner flange 18b of the spring 18 so as to correspond to the spring center projection 17g. A compression spring 30 is inserted between the spring center protrusion 17g and the spring housing recess 18g, and the first group moving frame 1
8 to move backward. Therefore, the first group moving frame 1
The first group fixed frame 20 supported by the first group 8 is moved by the clearance existing between the first group follower pin 18f and the first group storage space C1A1.
It can be retracted to the mechanical position abutting c). This mechanical contact position is indicated by the symbol P in FIGS. The second-group moving frame 19 can be retracted to a mechanical position in contact with the third-group frame 22 by a clearance existing between the second-group follower pin 19f and the second-group storage plaza C1A2. This mechanical contact position is indicated by the symbol Q in FIGS. For this reason,
The storage length of the first lens unit L1 and the second lens unit L2 can be reduced as compared with a conventional device in which the storage positions of the first lens unit L1 and the second lens unit L2 are strictly defined by cam grooves. Furthermore, the third group frame 22
The spring 23 pressing against the nut attached to the feed screw 24 can be retracted to a position where the spring 23 contracts mechanically with the housing 11. This mechanical contact position is shown by the symbol R in FIGS.
Indicated by The upper half of FIGS. 5, 6, and 7 shows the storage positions where the first group fixed frame 20, the second group moving frame 19 (light blocking ring 19c), the third group frame 22, and the housing 11 are in mechanical contact. I have. Note that the position of the first-group fixed frame 20 with respect to the first-group moving frame 18 is moved back and forth by adjustment at the time of assembly.
The amount of backward movement of the group moving frame 18 depends on the position of the first group fixed frame 20. At the time of storage, the adjustment amount is absorbed by the spring 30, and the lens barrel in which the contact position indicated by PQR can be stored can be stored.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0032

[Correction method] Change

[Correction contents]

When the cam ring 15 rotates from the storage rotation position to the photographing position, the first group follower pin 18f in the first group storage plaza C1A1 is moved to the second group zoom section C1Z.
2, the first group zoom section C1Z1 is reached, and the second group follower pin 19f passes from the second group storage plaza C1A2 through the first group storage plaza C1A1 to the second group zoom section C1Z2. Thus, the follower pin 19f for the second group (the second lens
Zoom zone C1Z2 for the zoom lens group L2) is 1
For the group follower pin 18f (first lens group L1), it is a mere passage section from the storage position to the photographing position (zoom section), which reduces the number of cam grooves, facilitates arrangement, and reduces the inclination. Useful for.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction contents]

The inner lens frame ring 17 is independent of the first-group moving frame 18, but has a locus substantially similar to that of the first-group moving frame 18.
Move in the optical axis direction. For this reason, on the outer surface of the cam ring 15, there are provided lens frame ring cam grooves C2 (FIG. 8, three at equal angular intervals in the circumferential direction) for moving the inner lens frame ring 17 guided straight forward and backward in the optical axis direction. The cam groove C2 for the lens frame ring is formed.
A follower pin 17f (FIG. 8) protrudingly formed on the inner surface of the inner lens frame ring 17 is fitted on the inner lens frame ring 17 . The developed shape of the cam groove C2 is similar to that of the lens group cam groove C1, and as shown in FIG.
It has a group zoom section corresponding section C2Z1, a second group zoom section corresponding section C2Z2, and a barrier opening / closing section C2B.
The barrier opening / closing section C2B is a circumferential groove, and the cam ring 1
5 and the inner lens frame ring 17 rotate only relative to each other. FIG.
As is apparent from FIG.
The cam groove C2 for the lens frame ring is slightly displaced in the optical axis direction.
The follower pins 18f of the group moving frame 18 are arranged in a direction parallel to the optical axis.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0034

[Correction method] Change

[Correction contents]

As described above, the inner lens frame ring 1 exposed to the exterior
7 is guided in the optical axis direction by a different cam mechanism as a member separate from the first-group moving frame 18 so that the external force applied to the inner lens frame ring 17 is transmitted from the first-group moving frame 18 to the first lens group L1. This prevents the optical performance of the zoom lens from deteriorating due to the shift of the optical axis of the first lens unit L1 and the like.
Further, a cam groove C for a lens group having a similar shape of the cam ring 15.
1 and the lens frame ring cam groove C2 are slightly displaced from each other in the optical axis direction. The force can be received by the first group moving frame 18 via the first group follower pin 18f. Furthermore, since the follower pin 17f fitted in the lens frame ring cam groove C2 and the follower pin 18f fitted in the lens group cam groove C1 are arranged in a direction parallel to the optical axis, the directions separated from each other by the compression spring 30. The spring force acting between the first-group moving frame 18 and the inner lens frame ring 17 that is urged to move is hardly changed by the relative rotation position of the cam ring 15.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Change

[Correction contents]

As shown in FIGS. 2 and 14, the barrier block 40 is rotatable about a barrier support frame 41 having a photographing opening 41a in the center and a pair of rotation center bosses 41b formed in the barrier support frame 41. A pair of supported barrier plates 4
2. A barrier closing spring (torsion spring) 43 for urging the pair of barrier plates 42 in the closing direction, and a barrier support frame 41
And a barrier mounting plate 44 that supports the barrier closing spring 43, and is sub-assembled as a separate unit in advance. A barrier boss 42 a (FIG. 12, FIG. 13) provided on the pair of barrier plates 42
And protrudes toward the barrier opening / closing ring 31 side from the escape groove 44a formed in the groove. The barrier opening / closing ring 31 is formed with a pair of opening / closing projections 31c that engage with the pair of barrier bosses 42a. FIGS. 12 and 13 show the barrier plate 42 as a virtual line ( one point).
FIG. 13 is a diagram indicated by a chain line ), and illustrates a state where the barrier opening / closing ring 31 closes the barrier (FIG. 12) and a state where the barrier opening / closing ring 31 is open (FIG. 13). FIG. 14 is a view when the barrier block is mounted without the barrier support frame 41.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0039

[Correction method] Change

[Correction contents]

FIG. 16 shows the movement of the rotation transmitting surface 15d when the cam ring 15 reaches the preparation section from the storage position. The cam ring 15 is provided with a cam ring regulating cam groove 13 of the fixed ring 13.
b, follower pin 15b, rotation transmitting groove 14 of rotating ring 14
a while moving in the direction of the optical axis in accordance with the relationship of FIG.
6, position 1 , 2 , 3 , 4 ), then rotate only (same position)
4, 5 ). When the rotation transmitting surface 15 d moves from the section 4 to the section 5 , the rotation transmitting surface 15 d separates from the driven surface 31 a of the barrier opening / closing ring 31 and opens the barrier plate 42. Conversely, when the cam ring 15 reaches the storage position from the preparation section, the section of the rotation transmission surface 15 d
The movement from 5 to 4 closes the barrier plate 42.

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0041

[Correction method] Change

[Correction contents]

The above-described barrier block 40 is fitted into the lens frame ring body 17r inside the reinforcing ring 17x and bonded thereto, and then fitted into the opening at the distal end of the reinforcing ring 17x. By engaging with a hook (not shown) provided, it is prevented from falling off from the reinforcing annular body 17x. The barrier opening / closing ring 31 is rotatably supported between the barrier block 40 and the inner flange 17c of the inner lens frame ring 17. The inner lens frame ring body 17r made of synthetic resin includes:
In accordance with the position of the barrier plate 42, the barrier plate 4 in the open state is
Notch 17k (FIG. 14) into which 2 enters is formed,
A reinforcing annular body 17x covers the outside of the notch 17k. By providing a metal reinforcing ring 17x separate from the lens frame ring body 17r made of synthetic resin, a cutout 17k can be formed in the body 17r. If the barrier plates 42 of the barrier block 40 are stacked in a four-sheet configuration during storage, the radial length required for storage when the barrier is opened can be shortened, but the axial length requires a large amount, and one or two barrier plates are required. If so, the axial length can be shortened, but there is an unavoidable problem that the radial length requires a large amount. By forming the notch 17k for barrier escape in the inner lens frame ring 17 as in this embodiment, the axial length of the two-barrier configuration can be shortened, and the radial direction of the inner lens frame ring 17 can be reduced. The effect that the increase in length can be suppressed is obtained.

[Procedure amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0045

[Correction method] Change

[Correction contents]

Eventually, the straight guide key 19a is moved to the straight guide groove.
The rotation stops when it comes into contact with one wall of the first group 18c, and the linear guide groove 18c of the first group moving frame 18 that moves forward along the optical axis direction.
When the first group guide ring 18 is further advanced, the straight guide key 19a is moved to the straight guide groove 18c.
to go into. Then, the straight guide key 19a is moved to the straight guide groove 18.
c, the rotation of the second-group moving frame 19 is restricted, and the second-group follower pin 19f moves on the slope xx of the inclined edge β from the position of 3 to the position of 4 this time.
The group frame 19 moves straight in the direction opposite to the moving direction of the first group frame (position 4). When the cam ring 15 further rotates, the follower pin 19f for the second group enters the storage space C1A1 for the first group, and in the subsequent rotation of the cam ring 15 in the x direction, the first group moves according to each section of the cam groove C1 for the lens group. The frame 18 and the second group moving frame 19 move straight in the optical axis direction (the second group moving frame 19 is guided straight to the first group moving frame 18). As described above, the substantially triangular second-group storage plaza C1A2 not only secures clearance for releasing the position regulation of the follower pin 19f in the optical axis direction during storage, but also forms the oblique edge β. Rotate the second group moving frame 19 to move straight ahead guide key 19
a is guided to the rectilinear guide groove 18c to a position where it can be engaged, and the first group frame 18 and the second group frame 19 are moved in opposite directions in the optical axis direction to ensure the engagement between the two. Has the function of

[Procedure amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0046

[Correction method] Change

[Correction contents]

On the other hand, when the cam ring 15 rotates in the storage direction (the direction opposite to the arrow x in FIG. 10) from the photographing state, the follower pin 18f and the follower pin 19f are moved to the first group storage space C1A.
Return to the first and second group storage plazas C1A2. Here, the movement of the follower pin 19f will be specifically described. After passing through the first-group storage plaza C1A1, the follower pin 19f moves rightward in FIG. 10 along the bottom edge α shown in FIG. 9 of the second-group storage plaza C1A2. Eventually, when the follower pin 19f comes to a position slightly before the end point α1 of the bottom edge α, the straight guide key 19a comes off the straight guide groove 18c to reach the rotation permitting portion 18h, and the second group moving frame 19 is moved to the first group moving frame. 18 is rotatable. Thereafter, the follower pin 19f reaches the end point α1 and rotates integrally with the cam ring 15 around the optical axis of the lens, that is, the second group moving frame 19 relatively rotates with the first group moving frame 18.
The follower pin 15b of the cam ring 15 is
The cam ring 15 is retracted in the optical axis direction (moves rightward in FIG. 9) by the linear groove portion 13b1, and the follower pin 19f is finally located at the end point α2 in FIG. Thus, the first group moving frame 18 and the second group moving frame 19
Move smoothly to the respective storage positions. 2nd group moving frame 1
Assuming a configuration in which the cam groove 9 is moved to the storage position only by the straight traveling guide as in the case of the first group moving frame 18, the cam groove C1 is
5 must be formed longer in the circumferential direction (that is, above the end point α1 in FIG. 9).
Since it interferes with other formed cam grooves, the diameter of the cam ring 15 must be increased in order to avoid interference. However, according to the above embodiment, the cam groove for storing the second group moving frame 19 can be set short in the circumferential direction of the cam ring as long as it does not interfere with the other cam grooves. it can.

[Procedure amendment 12]

[Document name to be amended] Statement

[Correction target item name] 0047

[Correction method] Change

[Correction contents]

The two-group storage plaza C1A2 is formed in a substantially triangular shape as shown in the drawing, so that if it is formed in a straight line, the lens group cam groove C1, which is longer, can be made shorter. Thus, the lens group cam groove C1
Makes it possible to form the three lens group cam grooves C1 at the cam ring 15 at a gentle inclination angle. Further, since the second group storage space C1A2 having such a shape is provided, when the first group follower pin 18f and the second group follower pin 19f move forward from the storage position in the optical axis direction, the second group follower pin 19f is stored in the second group. Plaza C1A2
10 in the order of 1, 2, 3, and 4 in FIG.
The group moving frame 19 rotates relative to the first group moving frame 18 .

[Procedure amendment 13]

[Document name to be amended] Statement

[Correction target item name] 0048

[Correction method] Change

[Correction contents]

FIG. 15 shows the cam ring 1 of the second group moving frame 19.
5 shows a state of rotation with respect to FIG. One group moving frame 18
The lens group cam groove C1 has a correspondence with the rotational position of the cam ring 15 , whereas the second group moving frame 1
Reference numeral 9 rotates relative to the cam ring in the section R of FIG.

[Procedure amendment 14]

[Document name to be amended] Statement

[Correction target item name] 0050

[Correction method] Change

[Correction contents]

The overall operation from the storage position of the present zoom lens barrel having the above configuration to the photographing position (zoom position) is as follows. In the retracted position, the first group moving frame 18 urged rearward by the force of the compression spring 30 supports the first group fixed frame.
Due to the clearance existing between the first group follower pin 18f and the first group storage plaza C1A1,
Mechanical position P in contact with group moving frame 19 (light-shielding ring 19c)
And the second group moving frame 19 is the follower pin 1 for the second group.
By the clearance existing between 9f and the second group storage space C1A2, the third group frame 22 is retracted to the mechanical position Q in contact with the third group frame 22, and the third group frame 22 is pressed against a nut attached to the feed screw. The spring 23 is contracted and the housing 1 is
It has retracted to the position R where it comes into mechanical contact with 1. Due to these mechanical contacts, the storage length is reduced. In this storage position, the rotation transmitting surface 15d of the cam ring 15 pushes the driven surface 31a to rotate the barrier opening / closing ring 31 in the barrier closing direction against the force of the tension spring 45, and the opening / closing projection 31c is moved from the barrier boss 42a. Since they are separated, the barrier plate 42 closes the photographing opening 41a (FIG. 12).

[Procedure amendment 15]

[Document name to be amended] Statement

[Correction target item name] 0051

[Correction method] Change

[Correction contents]

The rotating ring 14 extends the lens from the stored state.
When rotated in the direction, the cam ring 15 having the follower pin 15b moves only linearly by the straight groove portion 13b1 of the fixed ring 13 and the inclined groove portion 14a2 of the rotating ring 14. Then
The followers 18f and 19f located in the storage plazas C1A1 and C1A2 of the lens group cam groove C1 are provided with the cam grooves C1 .
The first-group fixed frame 20 and the second-group moving frame 19 (light-shielding ring 19c), which are mechanically in contact with each other, are moved forward by being pushed by the edge, thereby releasing the mechanical contact with each other. ,
The mechanical contact between the second group moving frame 19 and the third group frame 22 is also released.

[Procedure amendment 16]

[Document name to be amended] Statement

[Correction target item name] 0052

[Correction method] Change

[Correction contents]

When the rotating ring 14 further rotates in the lens extending direction, the cam ring 15 moves to the photographing state transition groove 1 of the fixed ring 13.
By 3b2, it moves in the optical axis direction with rotation, and eventually reaches the zoom section groove 13b3. At the initial stage of rotation of the cam ring 15 by the photographing state transition groove 13b2, the rotation transmitting surface 15d of the cam ring 15 separates from the driven surface 31a of the barrier opening / closing ring 31, and the barrier opening / closing ring 31 is moved by the force of the tension spring 45. It turns in the opening direction and opens the barrier plate 42 against the force of the barrier closing spring 43. Further, before and after the barrier opening operation, the second group moving frame 19 relatively rotates with respect to the first group moving frame 18 , and the first group fixed frame 20 slides on the sliding sheet 26.

[Procedure amendment 17]

[Document name to be amended] Statement

[Correction target item name] 0053

[Correction method] Change

[Correction contents]

Next, when the follower pin 15b of the cam ring 15 reaches the zoom section groove 13b3 by the rotation of the rotary ring 14 in the same direction, the contact end face 32b of the rear end of each projection 32c of the biasing ring 32 is moved to the follower pin. 15b. Since the urging ring 32 is urged rearward by the tension spring 33 , the follower pin 15 is moved through the contact end face 32b.
b is brought into contact with the rear surface of the zoom section groove 13b3.
This relationship is maintained while the follower pin 15b is located in the zoom section groove 13b3, and the cam ring 15 is fixed as long as the cam ring 15 is rotated through the rotary ring 14 in the zoom section of FIG. Backlash for the ring 13 is eliminated.

[Procedure amendment 18]

[Document name to be amended] Statement

[Correction target item name] 0056

[Correction method] Change

[Correction contents]

When the cam ring 15 rotates from the zoom section to the storage position, the outer lens frame ring 16 and the inner lens frame ring 17 are both moved rearward in the optical axis direction by the reverse operation to move one group. 1 supported by the frame 18 (first lens group L1)
The group fixed frame 20 and the second group moving frame 19 (the second lens group L2) are located at the retracted ends of the compression springs 30 and are in contact with each other, and the second group moving frame 19 is in mechanical contact with the third group frame 22. Spring 2 pressing against nut attached to feed screw 24
By 3 the third group frame 22 is retracted until it comes into contact with the filter holding portion 11c. Further, the rotation transmitting surface 15d of the cam ring 15 pushes the driven surface 31a to rotate the barrier opening / closing ring 31 in the barrier closing direction against the force of the tension spring 45, and the barrier plate 42 closes the photographing opening 41a.

[Procedure amendment 19]

[Document name to be amended] Statement

[Correction target item name] 0070

[Correction method] Change

[Correction contents]

When the cam ring 15 further rotates in the x direction,
In accordance with the slope xx, a motion in which the optical axis direction component and the circumferential direction component are mixed occurs in the second group follower pin 19f (2, 3,
4) Eventually, the straight guide key 19a is turned into the straight guide groove 18c.
Fits within. In this state, the second group follower pin 19f
Enters the first-group storage plaza C1A1, and in the subsequent rotation of the cam ring 15 in the x direction, the first-group moving frame 18 and the second-group moving frame 19 move straight in the optical axis direction according to each section of the lens group cam groove C1. Moving.

[Procedure amendment 20]

[Document name to be amended] Statement

[Correction target item name] 0071

[Correction method] Change

[Correction contents]

On the other hand, when the cam ring 15 rotates in the storage direction (the direction opposite to the arrow x in FIG. 10) in the photographing state, the follower pin 18f and the follower pin 19f move to the storage space C for the first group.
Return to 1A1 and 2nd group storage plaza C1A2. Here, the movement of the follower pin 19f will be specifically described. The follower pin 19f, after passing through the first-group storage plaza C1A1, moves upward in FIG. 9 along the bottom edge α of the second-group storage plaza C1A2 shown in FIG. Eventually when the follower pin 19f comes slightly before the position than the end point α 1 of the bottom edge α, linear guide key 19a is linear guide groove 1
8c to reach the rotation permitting portion 18h, and the second group moving frame 1
9 becomes rotatable relative to the first group moving frame 18. Thereafter, the follower pin 19f reaches the end point α1 and rotates integrally with the cam ring 15 around the optical axis of the lens, that is, the second group moving frame 19 relatively rotates with the first group moving frame 18.
The follower pin 15b of the cam ring 15 is
13b1, the cam ring 15 retreats in the optical axis direction (moves rightward in FIG. 9), so that the follower pin 19f is finally located at the end point α2 in FIG. In this way, the first group moving frame 18 and the second group moving frame 19 move smoothly to the respective storage positions. Assuming a configuration in which the second group moving frame 19 is moved to the storage position only by the straight-ahead guide in the same manner as the first group moving frame 18, the cam groove C1 is set in the circumferential direction of the cam ring 15 (that is, above the end point α1 in FIG. 9). Must be formed longer, but if it is left as it is, it interferes with other formed cam grooves. Therefore, in order to avoid interference, the diameter of the cam ring 15 must be increased. However, according to the above embodiment, the cam groove for storing the second group moving frame 19 can be set short in the circumferential direction of the cam ring 15 within a range that does not interfere with other cam grooves.
Can be reduced in diameter.

[Procedure amendment 21]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is an overall exploded perspective view showing an embodiment of a zoom lens barrel according to the present invention.

FIG. 2 is a top view of the zoom lens barrel shown in FIG. 1;
It is an expansion perspective view of a part.

FIG. 3 shows the zoom lens barrel in the middle part of FIG. 1;
It is an expansion perspective view of a part.

FIG. 4 is a bottom view of the zoom lens barrel shown in FIG. 1;
It is an expansion perspective view of a part.

FIG. 5 is a longitudinal sectional view of the zoom lens barrel of the present invention in a housed state.

FIG. 6 is a longitudinal sectional view of a stored state of the zoom lens barrel of the present invention at a sectional position different from FIG. 5;

FIG. 7 shows a state in which the upper half of the zoom lens barrel according to the present invention is housed,
It is a longitudinal cross-sectional view showing a lower half as a shooting state.

FIG. 8 is a development view of a cam ring.

FIG. 9 is a developed view showing a shape of a lens group cam groove of a cam ring.

FIG. 10 is a development view showing a relationship between a lens group cam groove of a cam ring and a first group moving frame follower pin and a second group moving frame follower pin.

FIG. 11 is a development view of a cam ring regulating cam groove of a fixed ring and a rotation transmission groove of a rotating ring in which a follower pin of the cam ring is fitted.

[12] The barrier mounting plate removed lens barrel Bali
It is a front view of a back closed state.

[13] which is also a front view of the barrier open state.

[14] which is also a front view showing the barrier and inner barrel ring <br/> relationship barrier blocks.

FIG. 15 is a graph illustrating optical axis positions of a first lens group (first group moving frame) and a second lens group (second group moving frame) in a zoom section and a storage section.

FIG. 16 is a development view showing a positional relationship between a cam ring and a barrier opening / closing ring.

FIG. 17 is an enlarged perspective view of a barrier plate.

[Description of Signs] L1 First lens group L2 Second lens group L3 Third lens group 10 Substrate 10a Solid-state imaging device 11 Housing 11b Outer peripheral cylindrical portion 11c Filter holding portion 11d Low-pass filter 12 Shaft retainer 13 Fixed ring 13a Fixed flange 13b Cam ring regulating cam groove 13b1 Straight groove 13b2 Shooting state transition groove 13b3 Zoom section groove 13b4 Assembly groove 13c Straight running guide groove 14 Rotary ring 14a Rotation transmission groove 14a1 Linear groove 14a2 Inclined groove 14a3 Circumferential groove 14b Gear 14c Spring projection Hole 15 Cam ring 15a Thick portion 15b Follower pin 15c Annular groove 15d Rotation transmitting surface 15k Notch 16 Outer mirror frame ring 16r Mirror frame ring body 16a Thick portion 16b Straight guide key 16c Straight guide groove 16d Bayonet claw 16f Escape groove 16x Reinforced annular body 17 Inner lens frame ring 17r Lens frame ring main body 17a Thick portion 17b Linear guide key 17c Inner flange 17d Linear guide boss 17f Follower pin 17g Spring center protrusion 17h Spring hook protrusion 17j Follower seat 17k Notch j Seat 17x Reinforced annular body 18 First group moving frame 18a Straight guide hole 18b Inner flange 18c Straight guide groove 18d Female screw portion 18f Follower pin for first group 18g Spring storage recess 18h Rotation permissible portion 18j Opening 19 Second group moving frame 19a Straight guide key 19b Annular concave portion 19c Light-shielding ring 19f Follower pin for second group 20 First group fixed frame 21 Shutter block 21a Shutter blade 21b FPC board 22 Third group frame 22a Straight guide rod 23 Spring 24 Feed screw 26 Slide sheet 28 Guide plate 29 Elastic ring (rubber rubber) 30 Compression spring 31 Barrier opening / closing ring 31a Driven surface 31b Spring hooking projection 31c Opening / closing projection 31k Notch 32 Energizing ring 32a Spring hooking projection 32b Contact end face 32c Projection 33 Tension spring 40 Barrier block 41 Barrier support frame 41a Shooting opening 41b Rotation center boss 42 Barrier plate 43 Barrier closing spring 44 Barrier mounting plate 45 Tension spring C1 Lens group cam groove C1Z1 Group 1 zoom section C1Z2 Group 2 zoom section C1A1 Group 1 storage square C1A2 Group 2 storage square Z1T 1st group tele position Z1W 1st group wide position Z2T 2nd group telephoto position Z2W 2nd group wide position C2 Lens frame ring cam groove C2Z1 1st group zoom section C2Z2 2nd group zoom section C2B Barrier opening / closing section

[Procedure amendment 22]

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[Correction target item name] Fig. 6

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FIG. 6

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[Correction target item name] Fig. 7

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FIG. 7

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[Correction target item name] Fig. 8

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FIG. 8

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FIG. 10

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FIG. 11

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FIG.

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FIG. 13

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FIG. 14

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FIG. 16

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──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03B 5/00 G03B 9/10 Z 9/10 H04N 5/225 D H04N 5/225 101: 00 // H04N 101: 00 G02B 7/04 DZ (72) Inventor Isao Okuda 2-36-9 Maenocho, Itabashi-ku, Tokyo Inside Asahiko Gaku Kogyo Co., Ltd. (72) Inventor Satoshi Nakamura 2-36 Maenocho, Itabashi-ku, Tokyo No. 9 Asahi Gaku Kogyo Co., Ltd. F term (reference) 2H044 AE01 BD08 BD10 BD14 BF03 BF05 DA01 DA02 DB02 DB03 EC01 EF02 EF07 2H081 EE04 5C022 AA00 AB66 AC54 AC78 CA00

Claims (7)

[Claims] 1. A front group lens frame that supports a front group lens and is guided in a straight line in the optical axis direction; a rear group lens frame that supports a rear group lens; follower pins formed respectively on the front and rear lens frames; A cam ring having a cam groove for engaging a follower pin of the lens frame and being driven to rotate; the cam groove of the cam ring includes: A storage position for moving the front and rear lens groups backward, between the front group lens frame and the rear group lens frame, and in the vicinity of the storage position, the rear group lens frame with respect to the front group lens frame that is guided straight ahead. A selective straight guide mechanism is provided that allows relative rotation and does not allow relative rotation between the front lens group frame and the rear group lens frame and allows only relative movement in the optical axis direction in an area including the moving section excluding the vicinity of the storage position. Characterized by the fact that The lens barrel. 2. The lens barrel according to claim 1, wherein a shutter block is mounted on the rear lens group frame, and a flexible printed circuit board for transmitting an operation signal is guided rearward from the shutter block. . 3. The lens barrel according to claim 2, further comprising an elastic ring that engages with the flexible printed board and urges the flexible printed board away from the optical axis. 4. The lens barrel according to claim 1, wherein the front group lens frame guided straight has a straight guide groove parallel to the optical axis on an inner peripheral surface thereof. A rotation permissible portion in which the width of the leading end portion of the rectilinear guide groove is increased in the circumferential direction is formed, and the rear group lens frame is located in the rotation permissible portion of the front group lens frame near the storage position. A lens barrel in which a straight guide key that fits in the straight guide groove is formed in an area including the moving section except for the vicinity of the storage position. 5. The lens barrel according to claim 4, wherein an inner flange for supporting the front group lens is formed integrally with the front lens group frame, and the rear lens group is formed on the inner flange. A lens barrel having a circumferential opening in which a part of a front end portion of a rear lens group frame including the rectilinear guide key projects forward when the frame is near the storage position. 6. The lens barrel according to claim 1, wherein the moving section is a zoom section in which the front and rear lens frames are moved in a zoom photographing section. 7. The lens barrel according to claim 1, wherein said rear lens group rotates near said storage position in conjunction with rotation of said cam ring. Tube.