JP2001183567A - Lens barrel device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel device having high accuracy 1 frame member forward and backward, having a good efficiency in terms of space, and which can be miniaturized and made compact. SOLUTION: The lens barrel device 1 is provided with a 1st group frame 4, a focus frame 5, a focus holding frame 6 and a 3rd group frame 7 which are supported by guide shafts 8, 9 and 11 so as to be freely moved forward and backward, and the guide shafts 8 and 9 are firmly fixed and supported in parallel to the focus holding frame 6, and the 1st group frame 4 and the 3rd group frame 7 are supported at both end part of the guide shafts so as to be made slidable. Accordingly, the occupied space due to the movement of the 1st group frame 4 and the 3rd group frame 7 is small, then, the distortion of the guide shaft is reduced as compared with the conventional lens barrel where a guide shaft for cantilever-supporting the end part is used, then, the accuracy in moving the frame member forward and backward is enhanced, besides, the guide shaft can be made narrower.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
Alternatively, the present invention relates to a structure of a lens barrel device having a movable frame member that is indirectly held.

[0002]

2. Description of the Related Art In recent years, compact cameras have tended to be further miniaturized or zoomed in at a high magnification, and various types of lens barrel moving frame advancing / retracting mechanisms have been proposed to cope with such trends. .

For example, in a lens barrel to which the moving frame positioning method disclosed in JP-A-4-52629 is applied, a guide member for slidably supporting one moving frame with respect to the other moving frame. A structure is employed in which one end or both ends of the (bar-shaped guide member) is fixed in a cantilevered state or both ends supported by the one moving frame.

[0004]

However, in the lens barrel disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 4-52629,
Since one end or both ends of the rod-shaped guide member is fixed to the movable frame, the space around the fixed portion becomes useless. At the same time, the arrangement space of other structural members is limited. Further, in the case of the cantilever structure in which the rod-shaped guide member supports one end, the span of the rod-shaped guide member is long, and the bending becomes large. This has been a hindrance to miniaturization.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a lens barrel apparatus capable of reducing the size and size of a frame member with good accuracy of forward and backward movement of a frame member, high space efficiency, and good space efficiency. The purpose is to provide.

[0006]

According to a first aspect of the present invention, there is provided a lens barrel apparatus comprising: a movable frame which can move forward and backward; and a rod-shaped guide member for guiding and supporting the movable frame. The guide member is attached so as to penetrate the moving frame, and both ends thereof are slidably supported relative to other frame members.

According to a second aspect of the present invention, there is provided a lens barrel device comprising: a first movable frame capable of moving forward and backward, a second movable frame capable of moving forward and backward, a third movable frame capable of moving forward and backward; It has both end faces, and has a guide member for guiding the first and third moving frames, and the guide member is fixed to the second moving member, and has both end faces of the guide member. The first moving frame and the third moving frame are provided to be slidable in each of the vicinity.

According to a third aspect of the present invention, there is provided a lens barrel device comprising: a first frame member movable forward and backward; a second frame member movable forward and backward; a third frame member movable forward and backward; It has both end surfaces, and has a guide member for guiding the relative movement between the second frame member and the first and third frame members, and the guide member includes the second frame member. Fixed to the member,
The first frame member and the third frame member are provided so as to be slidable in the vicinity of both end faces.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a lens barrel as a lens barrel device according to one embodiment. FIG.
FIG. 4 is a perspective view showing a state where a guide shaft and a focus holding frame of the lens barrel device are supported using a first assembly jig for positioning a guide shaft. FIG. 3 is a perspective view of a second assembly jig for positioning the lens / holding frame of the lens barrel, and FIG. 4 is a third assembly jig for positioning the lens / holding frame of the lens barrel. It is a perspective view of.
FIG. 5 is a longitudinal sectional view showing an assembled state of the lens barrel using the second and third assembling jigs for positioning the lens and the holding frame. FIG. 6 is an enlarged cross-sectional view showing the shape of the bonding portion between the lens group and the lens holding frame in the lens barrel. FIG. 6A shows a case where the lens holding frame projects more than the lens. 6B shows a case where the lens protrudes from the lens holding frame, and FIG.
(C) shows a case where the lens holding frame and the lens are substantially on the same plane. FIG. 7 shows a longitudinal sectional view after the lens barrel is assembled. FIG. 8 is a cross-sectional view taken along the line AA of FIG. 7 and shows a partial cross section around a guide axis in the lens barrel.
FIG. 9 is a development view of a cam groove of a cam ring applied to the lens barrel.

In the following description, the subject side of the lens barrel is referred to as a front side, and the image forming side is referred to as a rear side. Also,
The direction of rotation of the cam ring and the like is indicated by the direction of rotation viewed from the front side (subject side).

The lens barrel 1 of the present embodiment is built in a zoom camera or is applied as an interchangeable zoom lens barrel. The float key 3 (see FIG. 7), which is restricted in rotation as shown in FIG. 1 and the like and is supported so as to be able to move forward and backward, is supported so as to be able to move forward and backward together with the float key 3 and to be able to rotate. Cam ring (cam cylinder)
2, a first group frame 4 of a first frame member (moving frame) relatively moved forward and backward by the cam ring 2, a first group lens (optical element) 21 held by the first group frame 4, and the cam ring 2. The focus holding frame 6 of the second frame member (moving frame) relatively driven forward and backward, and the focus frame 5 of the frame member (moving frame) driven forward and backward with respect to the focus holding frame 6 by a focus driving mechanism (not shown). A second group lens (front) 22, a second group lens (middle) 23, and a second group lens (rear) 24, which are focus lenses held by the focus frame 5 and constitute a second group lens (optical element); Focus frame 5
And a shutter 15 to be incorporated in the camera. further,
The lens barrel 1 includes a third group frame 7 of a third frame member (moving frame) relatively driven by the cam ring 2 and a third group lens (optical element) held by the third group frame 7. Do 3
It has a group lens (front) 25 and a third group lens (rear) 26. Further, the lens barrel 1 is fixed to a focus holding frame 6 and is a guide shaft 8 and a guide shaft 9 which are guide members for slidably supporting the first group frame 4 and the third group frame 7.
And a guide shaft 11 which is a guide member supported by the first group frame 4 and the third group frame 7 and slidably supporting the focus frame 5 via the sleeve 10.

The cam ring 2 is provided with three rows and three sets of cam grooves, the longitudinal direction of which extends along the rotation direction, on the inner circumference as shown in the developed view of FIG. The three sets of cam grooves include a cam groove (first cam groove) 2a into which a cam follower 4i described later slidably fits, and a cam groove (second cam groove) into which a cam follower 6i described later slidably fits. 2), a cam groove (third cam groove) 2c into which a cam follower 7i described later is slidably fitted, and a connecting groove 2e and a cam follower introduction groove 2d used when the cam follower is assembled.

The cam ring 2 is extended from a retracted position to a photographable position, and further moved from a retracted position θc of the lens barrel to a wide end position θ via a zoom drive unit (not shown).
w. At the time of the zooming operation, it is rotated between the wide end position θw and the tele end position θt (see FIG. 9). With the rotation drive, the cam follower is driven via the cam groove, and each frame member such as the first group frame 4 is driven forward and backward. The position of the cam ring 2 indicated by the position (rotation angle) θ is determined by the cam followers 2a, 2b,
2c is shown as a relative rotation position with respect to the cam follower row (fixed).

The first group frame 4 has an outer peripheral portion 4j, a rear projecting lens holding portion 4a having a claw portion 4g protruding toward the optical axis, and two upper and lower portions of the frame portion. Bosses 4b and 4c extending to the front, a shaft hole 4f into which the tip of the guide shaft 11 is fitted, and a cam groove 2a fixed to the outer peripheral portion.
And three cam followers 4i that can be fitted into the cam follower 4i.

The inner peripheral dimension of the projection-shaped lens holding portion 4a has a loose fitting dimension with a gap with respect to the outer diameter of the first lens group 21 to be mounted. The dimensions are set so as to absorb variations and to provide a gap that can be filled with the adhesive. Also, a gap in the optical axis O direction is provided between the position of the claw portion 4g and the surface of the first lens group 21. The gap reduces variations in dimensions of the frame and lens member related to the optical axis O direction. It is a gap that can be absorbed and filled with an adhesive.

The boss portion 4b is provided with a shaft hole 4d into which the guide shaft 8 is slidably fitted in a precision fitting state. On the other hand, the boss portion 4c is provided with an elongated hole 4e into which the guide shaft 9 is slidably fitted around the optical axis O in a precision fitting state. The shaft hole 4f is a shaft hole having a relatively short length into which the guide shaft 11 is fitted in a precision fitting state.

The above-mentioned or later-described precise fitting state is a state in which the corresponding hole portion and the shaft portion have no backlash, or
It refers to a state in which it is fitted with extremely little backlash.

The focus holding frame 6 has shaft holes 6a and 6b, which are disposed above and below the frame portion and in which the guide shafts 8 and 9 are loosely fitted (fitted with a gap), and are located at lateral positions of the shaft hole 6a. Guide shaft 1
There are provided an escape hole 6c through which the through hole 1 penetrates, three cam followers 6i fixed to the outer peripheral portion and fittable in the cam groove 2b, and a fitting inner diameter portion 6e. Further, a focus driving unit including a feed screw mechanism and the like (not shown) for focusing driving of the focus frame 5 described later is separately incorporated into the focus holding frame 6.

Guide shafts 8 and 9 are adhesively fixed to the shaft holes 6a and 6b in a state where they are positioned by using a guide shaft positioning assembly jig 31 described later. The relief hole 6
c is an escape hole into which the sleeve 10 can enter together with the guide shaft 11. The fitting inner diameter portion 6e can be fitted in a fitting outer diameter portion 5f of the focus frame 5 described later in a sliding state (small gap state).

The focus frame 5 has a front inner peripheral portion 3
A divided lens holding portion 5d and a jig escape portion 5g,
Outer fitting diameter of the recess 5i for incorporating the shutter and the lens holding portion 5j at the center inner peripheral portion, three projecting lens holding portions 5e extending in the optical axis direction at the rear side, and the focus holding frame at the rear outer periphery. 5f is provided. Further, the focus frame 5 has a relief portion 5h of the guide shaft 8 disposed above the frame portion, a sleeve fitting hole 5a disposed at a position lateral to the relief portion 5h, and a lower portion disposed below the frame portion. 1 group frame 4
U that can be fitted and slid into contact with the boss 4c of the
A groove 5c is provided.

Lens holder 5d and lens holder 5e
The inner circumference of the lens unit is the second group lens (front) 2
It has a loose fitting dimension with a gap with respect to the outer diameter of the second and second group lenses (rear) 24, absorbs variations in the dimensions of the associated frame and lens member, and is sufficiently filled with an adhesive. Shall be given a gap.

A lens abutment surface 5k is provided behind the lens holding portion 5d in the direction of the optical axis O so as to abut the lens surface of the second lens group (front) 22 to be mounted. A lens contact surface 5m is provided in front of the lens holding portion 5e in the direction of the optical axis O with which the lens surface of the second lens group (rear) 24 to be attached comes into contact.

The lens holding portion 5j has an inner periphery where the outer diameter of the second group lens (middle) 23 is precisely fitted, and the second group lens (middle) 23 is directly adhered and fixed.

The diameter of the sleeve fitting hole 5a is such that the sleeve 10 can be fitted in a loosely fitted state,
The dimensions are set so as to absorb variations in the dimensions of the lens member and to provide a sufficient gap for bonding with an adhesive.

The third group frame 7 has a front end face portion 7h, an outer peripheral portion 7g, and a lens holding portion 7 divided into three front inner peripheral portions.
d, a jig escape portion 7e, a shaft hole 7a above the frame portion into which the guide shaft 8 is slidably fitted in a precision fitting state, and a guide shaft 9 below the frame portion in a precision fitting around the optical axis O. The guide shaft 1 is positioned at a side of the elongated hole 7b slidably fitted with the shaft hole 7a.
A shaft hole 7c having a relatively short length for precision fitting 1 is provided.

Further, the third group frame 7 has three cam followers 7i fixed on the outer peripheral portion 7g and can be fitted into the cam grooves 2c, and three straight-moving members disposed on the rear flange portion of the outer peripheral portion 7g. A guide projection 7f is provided.

The inner peripheral dimension of the lens holding portion 7d has a loose fitting dimension with a gap with respect to the outer diameter of the fitting portion of the third lens group (front) 25 to be mounted. The dimensions are set so as to absorb variations in the dimensions of the members and to provide a sufficient gap for bonding with an adhesive.

The inner end surface 7 of the lens holding portion 7d
The flange surface 25 of the third group lens (front) 25 to be mounted with k
a gap is provided in the direction of the optical axis, and the gap absorbs a variation in dimensions of the associated frame and lens member, and has a dimension that provides a sufficient gap for bonding with an adhesive. I do.

To assemble the lens barrel 1 of the present embodiment having the above-described structure, a first assembly jig 31 for positioning the guide shaft shown in FIG. 2 and a lens / holding frame positioning shown in FIGS. A second assembling jig 32 and a third assembling jig 33 are used.

As shown in FIG. 2, the first assembling jig 31 for positioning the guide shaft holds the guide shafts 8, 9 above and below the outer peripheral portion thereof at a predetermined separation distance and in a state parallel to the optical axis O. V-grooves 31a and 31b for positioning and a positioning outer diameter portion 3 that can be precisely fitted to the fitting inner diameter portion 6e of the focus holding frame 6.
1c.

As shown in FIG. 3, the second assembly jig 32 for positioning the lens / holding frame has a cylindrical shape whose front and rear are partitioned by a wall portion (the rear wall surface is 32 g), and has a front inner peripheral surface 32a. And a rear inner peripheral surface 32b. A stopper (not shown) for positioning the focus holding frame 6 in the optical axis O direction is provided on the front inner peripheral surface 32a.

The wall portion is divided into three parts on the front side, and a protruding lens support part (inner peripheral surface) protruding in the optical axis direction.
A lens abutting surface 32f is provided behind the supporting portion 32e and the supporting portion, and further divided into three on the rear surface side, and a protruding lens supporting portion (inner circumferential surface) 32h protruding in the optical axis direction and a lens in front of the inner circumferential portion. An abutment surface 32i is provided. further,
Escape holes 32c and 32d are provided in the wall.

The front inner peripheral surface 32a has an outer peripheral portion 4j of the first group frame 4 and an outer peripheral surface 33a of an assembling jig 33 described later.
Is an inner peripheral surface capable of precision fitting. The rear inner peripheral surface 32b
Is an inner peripheral surface on which the outer peripheral portion 7g of the third group frame 7 can be precisely fitted.

The lens support (inner peripheral surface) 32e, 32
h is an inner peripheral surface on which the outer periphery of the second group lens (rear) 24 and the outer periphery of the third group lens (front) 25 can be precisely fitted.

The second assembling jig 33 for positioning the lens and the holding frame is a substantially disc-shaped jig having an outer peripheral surface 33a as shown in FIG. A protruding lens supporting portion 33b protruding in the direction and a lens abutting surface 33c provided behind the inner peripheral portion of the protruding lens supporting portion 33b. A lens abutting surface 33e is provided at the rear of the inner peripheral portion thereof, and a relief portion 33 is provided above and below the outer frame portion.
f is provided.

The inner peripheral surfaces of the lens support portions 33b and 33d are inner peripheral surfaces to which the outer peripheries of the first group lens 21 and the second group lens (front) 22 can be precisely fitted.

In assembling the lens barrel 1, first,
To fix the guide shafts 8 and 9 to the focus holding frame 6, a first assembly jig 31 is applied as shown in FIG. The part 6e is fitted. Then, the guide shafts 8 and 9 inserted into the shaft holes 6 a and 6 b of the focus holding frame 6 are fixed to the V-grooves 31 a and 31 b of the assembly jig 31. Since the shaft holes 6a and 6b are spaced from the guide shafts 8 and 9, respectively, the guide shafts 8 and 9 are located at a predetermined distance between the axes and at predetermined positions in the optical axis direction, and the optical axis O Is kept in parallel.

In the above-mentioned supporting state, an adhesive (fixing material) is injected from the adhesive injection holes 6f, 6g of the focus holding frame 6, and the guide shafts 8, 9 are fixed to the shaft holes 6a, 6b.

Next, the above-mentioned assembling jigs 32 and 33 are used to assemble the respective lens barrel constituent members around the focus holding frame 6 to which the guide shafts 8 and 9 are attached. At the time of assembly, the assembly jig 32 shown in FIG.
The jig 33 shown in FIG. 4 is inserted between the insertion points a1 and a2 with respect to the lens barrel 1 shown in FIG. Shall be performed.

First, as shown in the vertical sectional view of FIG. 5, the assembly jig 32 has
The outer peripheral surface of the group lens (rear) 24 is fitted, and the second lens group surface is brought into contact with the lens abutting surface 32f.

On the other hand, the outer peripheral surface of the second lens group (front) 22 is fitted to the inner peripheral surface of the lens support portion 33d of the assembly jig 33, and the lens surface is brought into contact with the lens abutting surface 33e. .

An assembling jig 32 to which the above lens is mounted
Focus holding frame 6 to which the guide shaft is fixed
Is inserted from the front side to a reference position in the optical axis direction in contact with a stopper (not shown) of the jig. Further, the fitting outer diameter portion 5f of the focus frame 5 to which the second group lens (middle) 23 is bonded and fixed is fitted to the fitting inner diameter portion 6e of the focus holding frame 6, and the lens contact surface 5m of the focus frame 5 is formed. Is inserted until it comes into contact with the front lens surface of the second lens unit (rear) 24. At this time, the position of the stopper is set so that the focus holding frame 6 is, as a matter of course, floating with respect to the stopper of the jig in the optical axis direction, that is, in a state with a gap.

Then, the guide shafts 8 and 9 are
5h and the U groove 5c. Also, the sleeve 10 is fitted into the sleeve fitting hole 5a of the focus frame 5,
The focus holding frame 6 is attached while being inserted through the escape hole 6c.

Thereafter, the assembling jig 33 on which the lens is mounted is fitted into the front inner peripheral surface 32a of the assembling jig 32, and the rear lens surface of the second group lens (front) 22 is applied to the lens of the focus frame 5. Insert until it comes into contact with the surface 5k. At this time, the lens support portion 33d of the assembly jig 33
Of the focus frame 5 fit into the escape portion 5g of the focus frame 5.

Therefore, the first group frame 4 is assembled. Before the first group frame 4 is assembled, the guide shaft 11 is fitted and inserted into the shaft hole 4f of the first group frame 4, and the first group frame 4 is inserted into the E-ring groove 11a at the tip of the guide shaft.
The ring 12 is fitted (see FIG. 8). This E-ring 12
Accordingly, the guide shaft 11 moves forward and backward together with the first group frame 4.

The first group frame 4 with the guide shaft 11 is inserted in front of the assembling jig 33 to a reference position in the optical axis direction in contact with a stopper (not shown) of the assembling jig 32. At this time, the guide shaft 8 is simultaneously connected to the shaft hole 4 d of the first group frame 4.
And the guide shaft 9 is fitted into the long hole 4e of the first group frame 4. Further, the boss 4c of the first group frame 4 is
Into the U groove 5c. After the guide shaft 11 is fitted with the sleeve 10 on the focus frame 5, the guide shaft 11 is held in a state of being inserted through the relief hole 6 c of the focus holding frame 6.

Thereafter, when the first group lens 21 is inserted into the first group frame 4, the first group lens 21 comes into contact with the lens abutting surface 33 c of the jig 33 while floating with respect to the first group frame 4. The outer diameter of the first lens group 21 is precisely fitted by the lens support portion 33b and is supported by the jig 33.

Subsequently, the rear inner peripheral surface 3 of the assembly jig 32
The third group frame 7 is fitted to 2b, and the end face 7h is the wall face 32g.
To the optical axis direction reference position that abuts on. then,
The guide shafts 8, 9 and 11 are respectively connected to the shaft hole 7a, the long hole 7b,
Fit into the shaft hole 7c. Further, the projection of the lens support portion 32h of the jig 32 fits into the escape portion 7e of the third group frame 7.

With the third group frame 7 inserted, the third group lens (front) 25 is fitted into the inner peripheral portion of the lens support portion 32h of the assembly jig 32, and the lens end surface abuts against the lens abutting surface 32i. And position it.

In a state where each lens barrel constituting member is set on the above-mentioned assembling jigs 32 and 33, one group is formed through each fitting shaft hole by the guide shafts 8 and 9 fixedly supported by the focus holding frame 6. The frames 4 and 3 are positioned with a predetermined accuracy with respect to the optical axis O position and the position in the optical axis O direction (see FIG. 7). Further, the rotational phase positioning of the focus frame 5 around the optical axis O with a predetermined accuracy is also performed via the boss 4c of the first group frame 4 (see FIG. 7).

On the other hand, the first group lens 21 and the second group lens (front)
22, second group lens (rear) 24, third group lens (front) 25
Are inserted into the inner peripheral surfaces of the three divided lens support portions by the assembling jigs 32 and 33 in a centered state of precision fitting, and
The positioning in the optical axis O direction is performed by contacting the contact portion.

As described above, the position of the optical axis O and the optical axis O of the outer peripheral portion of the first group frame 4 and the third group frame 7 are controlled by the assembling jig 32.
Since the position in the direction is also accurately positioned, each of the lens groups is supported in a floating state at a relatively accurate position with respect to the outer peripheral portion of the frame member.

The outer circumferences of the first group frame 4 and the third group frame 7 may theoretically have loose fitting dimensions with reduced precision as dimensions to be fitted to the inner circumference of the jig 32. This is because the positional accuracy of the guide shafts 8 and 9 has already been determined.

The three-part lens holders of the first group frame 4, the focus frame 5, and the third group frame 7 are mounted on the assembly jig 3
Positioned along the circumference of the inner peripheral surface of each of the corresponding three divided lens support portions 2 and 33, and positioned with appropriate clearances for adjustment and adhesion with respect to the outer periphery of each lens. Will do.

Further, the claw portion 4g of the first group frame 4, the lens holding portion end surface 7k of the third group frame 7 and the lens flange surface (the third lens group 25)
The flange surface 25a) has a gap suitable for adjusting the position in the optical axis O direction and bonding.

A guide shaft 11 fitted and inserted into the focus frame 5 via a sleeve 10 supported in a loose state.
As described above, even if the positions of the shaft holes of the first group frame 4 and the third group frame 7 positioned by the guide shafts 8 and 9 vary, they are held in an appropriate state following the positions of the shaft holes.

Although not shown in each lens support of the assembling jigs 32 and 33 shown in FIGS.
Incorporating a leaf spring type lens holding mechanism or the like for preventing displacement or dropping of each lens attached to the lens support portion further improves the workability of assembly.

The sleeve and the lens of the lens barrel 1 are bonded and fixed by an adhesive (fixing material) under the positioning and set state by the above-mentioned assembling jigs 32 and 33.

First, the sleeve 11 is bonded and fixed by injecting an adhesive through an adhesive injection hole 5b provided on the outer peripheral portion of the focus frame 5 and communicating with the sleeve fitting hole 5a.

The first group lens 21 is bonded and fixed to the lens holder 4a, the claw 4g, and the outer diameter of the first group lens 21 through an opening (not shown) provided on the outer periphery of the first group frame 4. An adhesive is injected, filled, and fixed into the formed lens holding portion gap S1 (see FIG. 5). Instead of the injection of the adhesive, an adhesive may be applied to the lens holding portion 4a of the first group frame 4 in advance and bonded.

The second group lens (front) 22 is bonded and fixed through an opening (not shown) provided on the outer periphery of the assembly jig 32 through the lens holding portion 5d, the lens contact surface 5k, and the second group lens (front). An adhesive is injected, filled, and fixed in the lens holding portion gap S2 formed from the outer diameter of the lens 22. Instead of injecting the adhesive, an adhesive may be applied to the lens holding portion 5d of the focus frame 5 in advance and bonded.

The second group lens (rear) 24 is bonded and fixed through an opening (not shown) provided on the outer periphery of the assembling jig 32 through a lens holding portion 5e, a lens contact surface 5m, and a second group lens (rear). An adhesive is injected, filled, and fixed in the lens holding portion gap S3 formed from the outer diameter of the lens 24. Instead of injecting the adhesive, an adhesive may be applied to the lens holding portion 5e of the focus frame 5 in advance and bonded.

The third group lens (front) 25 is bonded and fixed through an opening (not shown) provided on the outer periphery of the assembly jig 32 through the lens holding portion 7d, the inner end face 7k, and the third group lens (front) 25. Lens holding portion gap S formed from outer diameter
Inject adhesive into 4, fill and fix. Instead of the injection of the adhesive, the adhesive is previously applied to the lens holding portion 7d of the third group frame 7.
May be applied and bonded.

Here, the third group lens (rear) 26 abuts on the rear side surface of the third group lens (front) 25, and the inner peripheral surface 7m formed on the third group frame 7 and the third group lens (rear). ) An adhesive is filled in the gap formed by the outer diameter of 26, and adhesively fixed.

When assembling the third group lens (rear) 26, the first group lens 21, the second group lenses 22, 23, 24, and the entire third group lens (front) 25 together with the core of the third group lens (rear) 26 are used. It may be assembled while observing and adjusting the condition. Alternatively, the third group lens (rear) 26 is aligned with the assembled part of the third group lens (front) 25 and the third group frame 7 without the third group lens (rear) 26 while observing and adjusting the centering state. It may be assembled (adhered).

When the lens holding portion is filled with an adhesive, there is a possibility that the adhesive flows out onto the lens surface to impair the optical performance. Therefore, FIGS. 6 (A), (B),
As shown in (C), a chamfered portion is provided on the lens end face and / or the lens holding section end face to prevent the adhesive from flowing out.

That is, in a state where the lens holding portion protrudes from the lens, for example, as shown in FIG. 6A, the end face 7h of the lens holding portion 7d of the third group frame 7 has the third group lens (front). 3) The third group lens 2
5 is provided with a chamfered portion 25a on the end face. By adopting this shape, the adhesive 44 filled in the gap S4 hardly flows out of the gap S4 to the lens surface side.

In the state where the lens protrudes from the lens holding portion, for example, as shown in FIG. 6B, the second group lens (front) 22 is located closer to the end surface of the lens holding portion 5d of the focus frame 5 than the end face. Projecting, the lens holding portion 5d
Is provided with a chamfered portion 5n on the end face of the. By adopting this shape, the adhesive 42 filled in the gap S2 becomes
Hardly flows out to the lens surface side.

The state where the lens holding portion and the lens are on the same surface is a state where the lens barrel 1 does not exist in the lens barrel 1 of the above-described embodiment. For example, as shown in FIG. Since the end face of the lens holding portion 13d and the lens 27 are on the same plane, the end face of the lens holding portion 13d and the lens 2
7 on both sides of the chamfers 13a and 27a
Is provided. By adopting this shape, the adhesive 45 filled in the gap S5 hardly flows out of the gap S5 to the lens surface side.

Now, the jigs 32, 3 shown in FIG.
When the assembly of the guide shaft and the lens by 3 and the bonding are completed, the jigs 32 and 33 are removed from the lens barrel 1. At this time, the third group frame 7 is pulled out rearward from the assembly jig 32, and the first group frame 4 is pulled out together with the guide shaft 11 from the front side. After the assembly jig 33 is also pulled out from the front side, the focus frame 5 and the focus holding frame 6 are pulled out from the assembly jig 32 together with the guide shafts 8 and 9. The lens barrel 1 with the assembly jigs 32 and 33 removed.
Is shown in FIG. Note that the reason why the lens barrel 1 can be extracted as described above even when the assembling jig 32 having the wall portion (the wall surface 32g) is used depends on the support structure of each guide shaft. That is, the guide shaft 11 is supported on the first group frame 4 side, slidably supported on other frame members, and further only on the focus holding frame 6 where the guide shafts 8 and 9 are disposed at the center. This is because a structure that is fixedly supported and slidably supported by other frame members is employed.

A cam ring 2 is incorporated in the lens barrel 1 which has been assembled by the jig, and three cam followers 4 of a first group frame 4, a focus holding frame 6, and a third group frame 7 are provided.
i, 6i, 7i to three sets of cam grooves 2a, 2 of the cam ring 2.
b and 2c must be fitted respectively.

The cam ring 2 is rotated during zoom driving in the range from the retracted position θC to the telephoto end position θT indicated by the rotation position with respect to the cam follower, but as shown in FIG. A cam follower introduction groove 2d is provided at an introduction position θA, which is a further outer rotation position, and a connecting groove 2e for cam follower movement is provided at a switching position θB, which is a rotation position further outside the collapsed position θC. Is provided. Each of the cam grooves is provided so that the longitudinal direction of the groove is along the circumferential direction around the optical axis O in a state where the cam groove is connected to the cam follower introduction groove 2d and the connection groove e. Groove 2
b and the cam groove 2c.

The cam follower introduction groove 2d is a groove in the direction of the optical axis O provided so as to be connected to the tele-side ends of the cam grooves 2b and 2c, and has an insertion opening opened rearward. ing. The connection groove 2e is a groove in the direction of the optical axis O connected to the collapsed end of the cam grooves 2a and 2b.

The cam follower is fitted into the cam groove by using the cam follower introduction groove 2d and the connecting groove 2e. First, the cam follower 4i of the first group frame 4 shown in FIG. 7 is pulled out to the position where the cam ring can be inserted, and the cam ring 2 is rotated to the introduction position θA and inserted into the lens barrel 1, and the cam follower 4i is fitted into the cam follower introduction groove 2d. I do. When the cam follower 4i reaches the end position of the cam groove 2b, the cam ring 2 is switched to the switching position θB.
When it is turned clockwise, the cam follower 4i
Passes through the cam groove 2b and reaches the position of the connection groove 2e. Then, the cam ring 2 is pushed toward the rear side of the lens barrel, and the cam follower 4i is fed to the front end of the cam groove 2a. Then, the cam ring 2 is rotated counterclockwise to return to the introduction position θA.

Next, the cam followers 6i and 7i of the focus holding frames 6 and the third group frame 7 are set at positions where the cam ring can be inserted, and the cam ring 2 is further pushed toward the rear side of the lens barrel. Fit into groove 2d. And the cam follower 6i is the cam groove 2
The cam ring 2 is rotated clockwise in a state where the cam follower 7i has reached the position of the cam groove 2c and the cam follower 7i has reached the position of the cam groove 2c. The cam follower 6i fits into the cam groove 2b, and the cam follower 7i fits into the cam groove 2c. The cam followers 4i are kept fitted in the cam grooves 2a as they are, and the fitting of the cam followers into the cam grooves of the cam ring 2 is completed.

Then, the guide projection 7f of the third group frame 7 is fitted into the straight guide groove 3a provided on the float key 3, and the third group frame 7 is supported by the float key 3 in a rotation-restricted state so as to be able to advance and retreat. Then, the assembly of the lens barrel 1 of the present embodiment is completed.

Next, the advancing and retreating operation of the lens barrel 1 assembled as described above with the zoom camera incorporated therein will be described. When the lens barrel 1 is in a collapsed state,
The cam ring 2 rotates to the retracted position θC shown in FIG. 9 and is further retracted to the retracted position in the optical axis O direction.

Then, the cam ring 2 is extended to the photographable position along the optical axis O direction, and the collapsed area A1 (see FIG. 9) is moved counterclockwise through the zoom drive unit to the wide end position θ.
Rotate to W. By this rotation, each cam follower 4
i, 6i, 7i are relatively advanced and retracted by the cam grooves 2a, 2b, 2c, and the first group frame 4, the focus holding frames 6, 3
The group frame 7 relatively moves to a zoom wide end position at which photographing is possible.

Further, when the cam ring 2 is driven to zoom in the zoom area A2 (see FIG. 9) up to the telephoto end position θT by the zoom drive section, the cam followers 4i, 6i,
7i is relatively advanced and retracted by the cam grooves 2a, 2b, 2c, and the first group frame 4, the focus holding frame 6, and the third group frame 7
It moves relatively from the zoom wide end position to the zoom tele end position.

The focusing driving of the lens barrel 1 is performed with respect to the focus holding frame 6 driven by the zoom driving by the focus driving unit (not shown).
In the direction of the optical axis O.

According to the lens barrel 1 of the above-described embodiment, the first group frame 4, the focus frame 5, the focus holding frame 6, and the third group frame are formed by the guide shafts 8, 9 and 11.
It is supported so that it can advance and retreat. The guide shafts 8 and 9 are fixed to a focus holding frame 6 located substantially at the center, and both ends of the guide shafts 8 and 9 are connected to the first group frame 4.
And the third group frame can be slid. Therefore,
Compared to a conventional lens barrel in which both ends of a guide shaft supporting the frame member are fixed to the frame member, the space occupied by the frame members of the first and third group frames is reduced, and the size is reduced. It is effective for conversion. Furthermore, compared with the conventional lens barrel, which has a cantilever structure in which the end of the guide shaft is fixedly supported, the shaft span is shorter and the deflection is less, and more accurate movement of the frame member can be realized. Becomes Further, the diameter of the guide shaft can be reduced, which is also effective in reducing the size of the lens barrel.

The guide shaft 11 slidably supports the focus frame 5, whose rotation about the guide shaft 11 is restricted by the boss 4 c of the first group frame 3, via the sleeve 10. 8, one end of the guide shaft 11 is supported by the shaft hole 4f of the first group frame 4, and the other end is slidably supported by the shaft hole 7c of the third group frame 7. The fitting lengths of the shaft holes 4f and 7c are both short, and the guide shafts 8,
Since there is a degree of freedom in the inclination of the guide shaft 11 so that it can be non-parallel to 9, the first group frame 4 or 3
Variations and errors in the size and shape of the group frame 7 can be absorbed, and the movements of the first group frame 4 and the third group frame 7 are not hindered.

When the diameter of the guide shaft 11 is small, a high load torque for driving the focus acts between the focus frame 5 and the focus holding frame 6 during the focusing drive, and the guide shaft 11 is moved. Even in a situation in which the focus frame 5 is largely bent, the position of the focus frame 5 greatly changes because the fitting inner diameter portion 5f of the focus frame and the fitting outer diameter portion 6e of the focus holding frame are fitted in a sliding state. Is prevented.

Based on the above-described embodiment, (1) the lens barrel device has a moving frame that moves within the lens barrel, and a rod-shaped guide member that guides and supports the moving frame. A guide member is provided so as to penetrate the moving frame, and both ends of the guide member are supported so as to be slidable relative to other frame members.

(2) In the lens barrel device, a first frame member that moves in the lens barrel device, a second frame member that moves in the lens barrel device, A third frame member that moves with, and two end faces,
A guide member that guides relative movement between the second frame member and the first frame member and the third frame member, and the guide member is fixed to the second frame member. A lens barrel device, wherein the first frame member and the third frame member are provided so as to be slidable in the vicinity of both end faces.

(3) In the lens barrel device, a first moving frame that moves in the lens barrel device, a second moving frame that moves in the lens barrel device, And a guide member having two end surfaces and guiding the first and third moving frames, wherein the guiding member is configured to move the second moving frame. A lens barrel device fixed to a member, wherein the first moving frame and the third moving frame are slidably provided in the vicinity of both end surfaces thereof.

[0087]

According to the lens barrel apparatus of the present invention described above, the guide member for supporting the frame member is attached to the second frame member, and the first and third frame members can slide. The guide member has a short span, the bending is reduced, the frame member can be advanced and retracted with high precision, and the guide member itself can use a thin member. The size of the cylinder device can also be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a lens barrel as a lens barrel device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which a guide shaft and a focus holding frame are supported by a first assembly jig for positioning a guide shaft in the lens barrel of the embodiment.

FIG. 3 is a perspective view of a second assembly jig for positioning a lens / frame member applied to the assembly of the lens barrel of the embodiment.

FIG. 4 is a perspective view of a third assembly jig for positioning a lens / frame member applied to the assembly of the lens barrel of the embodiment.

FIG. 5 is a longitudinal sectional view of the lens barrel according to the embodiment in an assembled state of the lens barrel using second and third assembling jigs;

FIG. 6 is an enlarged cross-sectional view showing a cross-sectional shape of a bonding portion between a lens group and a frame member in the lens barrel according to the embodiment, and FIG. 6A shows that the frame member protrudes more than the lens group. 6B shows the case where the lens group protrudes more than the frame member, and FIG. 6C shows the case where the frame member and the lens group are substantially on the same plane.

FIG. 7 is a longitudinal sectional view after assembling the lens barrel of the embodiment.

8 is a sectional view (partial sectional view) taken along the line AA of FIG. 7;

FIG. 9 is a development view of a cam groove of a cam ring applied to the lens barrel of the embodiment.

[Explanation of symbols]

4 ... 1 group frame (first moving frame, first frame member) 6 ... focus holding frame (second moving frame, second frame member) 7 ... 3 group frame (third moving frame) , Third moving frame) 8, 9 ... guide shaft (guide member, rod-shaped guide member)

Claims (3)

[Claims] 1. A moving frame that can move forward and backward, and a rod-shaped guide member that guides and supports the moving frame, wherein the rod-shaped guide member is attached so as to penetrate the moving frame. A lens barrel device supported slidably relative to another frame member. 2. A first moving frame that can move forward and backward, a second moving frame that can move forward and backward, a third moving frame that can move forward and backward, and both end faces, A guide member for guiding a third moving frame, wherein the guide member is fixed to the second moving member, and the first moving frame and the A lens barrel device, wherein a third moving frame is provided so as to be slidable. 3. A second frame member having a first frame member movable forward and backward, a second frame member movable forward and backward, a third frame member movable forward and backward, and both end portions. And a guide member for guiding the relative movement between the first frame member and the third frame member.The guide member is fixed to the second frame member, and is provided near each of the both end face portions. A lens barrel device, wherein the first frame member and the third frame member are slidably provided.