JP3477909B2 - Lens barrel - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing member whose base end is fixedly attached to a lens mounting portion of a camera body, and to this fixing member which is attached in the optical axis direction and is rotatably supported. Lens barrel having a rotating member.

[0002]

2. Description of the Related Art Conventionally, there is a lens barrel having a fixed barrel connected to a camera body, the fixed barrel, and a rotating ring fitted rotatably. In such a lens barrel, a retaining ring for preventing the rotating ring from moving in the optical axis direction is provided. Further, the rotary ring and the fixed cylinder are provided with members for limiting the rotation range of the rotary ring. That is, a projection protruding in the radial direction is provided at one end of the rotary ring, and a block member that locks the projection is provided in the fixed cylinder by being screwed in the radial direction.

As a lens barrel of this type, there is one disclosed in Japanese Utility Model Publication No. 5-31606. The one disclosed in the publication has a lens barrel main body, a focusing ring rotatably mounted on the lens barrel main body, and an exterior outer frame screwed to the lens barrel main body. Further, in this lens barrel, in order to limit the rotation of the focusing ring, the limiting screw mounted in the radial direction of the focusing ring and the limiting screw provided on the inner peripheral portion of the outer frame to lock the head portion of the limiting screw. The protrusion is provided as the limiting member.

[0004]

Generally, when assembling a product, other parts are sequentially attached to basic parts. At this time, simplification of assembly work,
Also, from the standpoint of simplification, it is desirable that the parts can be mounted and mounted in the same direction as much as possible. Specifically, in the case of the lens barrel, most of the tubular body, the annular body, and the like are attached from the optical axis direction.
Therefore, it is preferable that the related parts to be attached together with them also have a structure to be attached in the optical axis direction. Particularly, in consideration of automation of assembly, it is desired that the work machines be assembled from the same direction in order to simplify the operation of the work machine.

However, in the above-mentioned prior art, it is necessary to work from the radial direction when attaching a restricting member such as a restricting block member or a restricting screw.
Therefore, when assembling the lens barrel, it is difficult to make the assembly directions the same. That is, there is a problem that workability is poor and automation is difficult.

An object of the present invention is to make it possible to mount a member for limiting the turning range of the turning member in the direction of the optical axis, simplify the work, improve workability, and facilitate automation. To provide a lens barrel that does.

[0007]

In order to achieve the above-mentioned object, according to one aspect of the present invention, a fixing member having a base end side fixedly attached to a lens mounting portion of a camera body, and the fixing member. A lens barrel including a rotating member that is mounted in the optical axis direction and is rotatably supported, and a restricting member that restricts a rotating range of the rotating member.
It is composed of a first member provided on the fixed member side and a second member provided on the rotary member side, and at least one of the first member and the second member is a fixed member or a rotary member on which it is provided. The fixing member or the rotating member, which is detachably attached in the optical axis direction and in which the first member or the second member is detachably provided, has an attaching portion for attaching the first member or the second member, There is provided a lens barrel characterized in that the first member and the second member contact each other to restrict the rotation of the rotating member.

The fixing member has a slip-out preventing portion for preventing the attached rotating member from slipping out, and the rotating member avoids the slip-out preventing portion from slipping out and fixes the rotating member. A structure having an attaching / detaching portion for attaching / detaching to / from can be used. In this case, at least the rotating member may be configured as a tubular body and fitted to the outer periphery of the fixed member.

The slip-out preventing portion is formed by a projecting portion projecting in the radial direction on the tip side of the fixing member, and a radius of an imaginary circumference inscribed with the tip of the projecting portion is larger than the inner radius of the rotating member. Can be

The projecting portion has a second side surface in the circumferential direction.
It can be configured to be provided at a position where it abuts against a member and also function as the first member.

The mounting portion is provided, for example, on the rotating member and is arranged at an angular position different from that of the attaching / detaching portion. In this case, the mounting portion can be formed by a through hole that opens in the end surface of the rotating member and extends in the optical axis direction, and the through holes can be provided at a plurality of positions on the end surface of the rotating member.

The second member can be composed of, for example, a locking piece having an L-shaped cross section. In this case, one end of the locking piece is attached to the mounting portion with the other end extending inward.

A buffer member may be provided at a contact portion of at least one of the first member and the second member with the first member and the second member. Specifically, for example, a cushioning member can be attached to the other end side of the locking piece.

Further, of the first member and the second member, the other member which is not attached to the attaching portion is previously provided integrally with, for example, a fixed member or a rotating member on which it should be provided. be able to.

[0015]

In the present invention, the fixing member and the rotating member mounted on the fixing member in the optical axis direction and rotatably supported are provided with the restricting member for restricting the rotating range of the rotating member. . Specifically, the regulation member is provided with the first member on the fixed member side and the second member on the rotation member side. At least one of the first member and the second member is detachably attached to the fixed member or the rotating member on which the first member and the second member are to be provided in the optical axis direction. The attachment is provided on a fixed member or a rotating member to which the first member or the second member is detachably provided,
This is performed for the mounting portion for mounting the first member or the second member. The other members can be integrally provided on the fixed member or the rotating member to which the other members are to be attached beforehand. Therefore, the regulation member can be mounted from the optical axis direction like the rotating member, and the work can be performed in the same direction.

In the present invention, it is possible to perform the pushing operation without using the screw when mounting the mounting portion. In that case, since the screw is not used,
No rotational movement is required to rotate the screw. Therefore, workability is not deteriorated due to mounting.

Further, when the cushioning member is arranged at the contact portion of at least one of the first member and the second member with the first member and the second member, the rotating member is rotated to move the first member and the second member. 1
The shock when the member and the second member contact each other is buffered. Therefore, it is possible to suppress the generation of a collision sound that has been conventionally generated when the limiting member abuts.

[0018]

EXAMPLES Examples of the present invention will be described below. Before describing the embodiments, an outline of the structure of the lens barrel will be described first, followed by a description of the structure of the regulating member, and then the structure and operation of the lens barrel as a whole.

FIG. 1 is a sectional view of a lens barrel according to an embodiment of the present invention. As shown in FIG. 1, the lens barrel of the present invention includes a male fixed mount 1 for mounting on a female mount (not shown) of a camera body, a fixed portion 2 integrated with the fixed mount 1, and an optical axis. A zoom ring 3 for zooming by rotating the zoom ring 3 in the direction, an adjusting member 4 fixed to the zoom ring 3 so as to rotate integrally with the zoom ring 3 after assembly and adjustment, and a cam for controlling the movement of the lens groups L1 and L2. A cam ring 5 that constitutes the mechanism, a male helicoid member 6 that zooms the lens group L1 in conjunction with the cam ring 5, a holding frame 7 for the lens group L1, and a drive gear (not shown) rotate about the optical axis. Drive ring 8 and screw 1 on the fixed part 2
It has a linear movement interlocking key 10 which is positioned and fixed at 2, and a holding member 11 which holds the lens unit L2.

Next, other portions of the lens barrel will be described with reference to FIG.

In FIG. 1, the fixed mount 1 is provided with a bayonet 1a. The fixed portion 2 has three straight-moving keys 2a protruding from the inner diameter portion thereof, a guide groove 2b provided around the optical axis and functioning as an angular groove for covering the range of zooming, and a tip portion of the fixed portion 2. And a guide groove 2c provided in the.

The zoom ring 3 has pins 3a protruding at three positions on the inner diameter side thereof and engaged with the guide grooves 2b, respectively, and a straight key 3b protruding toward the inner diameter side of the front end portion of the zoom ring 3. Have. The adjusting member 4 is provided with a female helicoid screw 4a provided on the inner diameter side. Here, 15 is an adhesive tape for fixing the zoom ring 3 and the adjusting member 4 after the adjustment. Reference numeral 20 denotes a rubber ring which is fixed to the zoom ring 3 and the adjusting member 4 after being fixed with the adhesive tape 15.

The cam ring 5 has a straight guide groove 5a provided on the outer right side and a male helicoid screw 5b provided on the outer diameter side.
It has a cam protrusion 5c provided on the left outer peripheral portion of the cam ring 5 and a concave cam groove 5d provided on the inner diameter portion. The male helicoid member 6 includes a helicoid screw 6a provided on the outer diameter left portion and a cam follower 6 provided on the inner diameter portion.
b, 6c, and a straight guide groove 6 provided on the right side portion of the outer diameter
d and.

The holding frame 7 of the lens unit L1 has a female helicoid screw 7a provided on the inner diameter portion and an engaging key 7b provided on the outer diameter right portion. The drive ring 8 has an interlocking key 8a that extends integrally with the drive ring 8 in the optical axis direction, and a drive gear 8b provided in the inner diameter portion. Lens group L
A holding member 11 for holding 2 is provided on the outer diameter portion, and an interlocking protrusion 11a engaging with the cam groove 5d and a linearly moving interlocking key 1 are provided.
And a guide groove 11b that engages with 0.

According to the above structure, when the zoom ring 3 is rotated around the optical axis, the adjusting member 4 and the cam ring 5 which are fixed integrally with the zoom ring 3 rotate around the optical axis. Since the cam projection 5c rotates around the optical axis, the cam projection 5c
cam followers 6b and 6c that are engaged so as to sandwich c,
The male helicoid member 6 moves back and forth in the optical axis direction by the action of the rectilinear groove 6d that engages with the rectilinear key 2a of the fixed portion 2.
As a result, the holding frame 7 of the lens unit L1 that is screw-engaged with the male helicoid member 6 is also integrally zoomed in the optical axis direction. On the other hand, the holding member 11 for the lens unit L2
Is an interlocking protrusion 11 that engages with the inner diameter cam groove 5d of the cam ring 5.
When the cam ring 5 rotates due to the action of a and the guide groove 11b that engages with the straight-movement interlocking key 10, the cam ring 5 moves in the optical axis direction. Along with this, the lens unit L2 performs zooming movement in the optical axis direction.

The lens unit L1 is also a focusing lens unit,
When the holding frame 7 is rotated, the helicoid screws 7a and 6a are driven to move in the optical axis direction to perform a focusing operation. Since the engaging key portion 7b is rotationally interlocked with the interlocking key portion 8a of the drive ring 8, the drive ring 8 rotates when performing the focusing operation. The drive ring 8 is constrained by the guide groove 2c of the fixed portion 2 to be rotatable only around the optical axis. When driving with a motor and a gear for AF, the gear 8b provided on the drive ring 8 and a drive gear (not shown) rotate about the optical axis.

Next, a structure in which the drive ring 8 which is a rotating member is mounted on the fixed portion 2 which is a fixed member, and the regulating member is further mounted will be described with reference to FIGS.

FIG. 2 shows a state in which the drive ring 8 is fitted into the fixed portion 2 along the optical axis as viewed from the front side of the lens barrel. Further, FIG. 3 shows a state in which the drive ring 8 is rotated clockwise from the state of FIG. 2 and 3, the parts related to the mounting of the drive ring are mainly shown, and the other parts are omitted.

As shown in FIG. 1, the fixed portion 2 is integrally provided on the fixed mount 1 and rotatably supports the drive ring 8 at a substantially middle portion of the lens barrel. As shown in FIGS. 2 to 6, the fixed portion 2 has a tubular body portion 2g on the base end side connected to the mount 1. A drive ring support portion 2f protruding from the open end of the tubular body portion 2g toward the tip end side along the optical axis is provided on the tip end side of the tubular body portion 2g. Drive ring support 2
The f is arranged at three positions along the circumference of the opening end at 120 degrees. Further, a protrusion 2e is provided at the tip of the drive ring support portion 2f in the outer circumferential direction in the radial direction. When the drive ring 8 is mounted, the protruding portion 2e functions as a retaining portion and also constitutes a part of a regulating member for regulating the rotation range of the drive ring 8. In the present embodiment, the height of the tip of the protrusion 2e is the same as the wall thickness of the tubular body 2g. The drive ring 8 is supported by the projecting portion 2e and the tubular body portion 2g. Therefore, when the cross section of the cylindrical body portion 2g, the drive ring support portion 2f, and the protruding portion 2e is viewed, it has a concave shape as shown in FIG.

The drive ring 8 is made of, for example, plastic, and has a portion forming a ring in a plane orthogonal to the optical axis, as shown in FIG. As shown in FIG. 2 to FIG. 4 and FIG. 6, the protruding portion 2 is provided on the inner peripheral side of the tip end side end surface of the drive ring 8.
A step portion 8g supported by the front end surface of e is provided in an annular shape. The protruding portion 2e rotates while supporting the stepped portion 8g. As with the step portion 8g, the drive ring 8 is provided with a step portion 8h as shown in FIGS. 4 to 6. This step 8h
Are supported by the cylindrical body portion 2g. Further, rectilinear grooves 8f extending in the optical axis direction are provided at three positions on the inner circumference side of the drive ring 8 at angular intervals of 120 degrees. The rectilinear groove 8f is provided as an attachment / detachment portion for attaching / detaching to / from the fixed portion 2. As will be described later, the depth of the rectilinear groove 8f is equal to that of the fixed portion 2
The projecting portion 2e provided at is set to a size that can relatively pass through the rectilinear groove 8f. That is, as shown in FIG. 4, when the drive ring 8 is mounted on the fixed portion 2, the rectilinear groove 8f is provided in order to mount the drive ring 8 while avoiding the protruding portion 2e. That is, the protruding portion 2e and the rectilinear groove 8f have a relationship like a key and a key groove. Then, as shown in FIG. 3, when the drive ring 8 is rotated in the clockwise direction, for example, the protrusions 2e at three places of the drive ring 8 engage with the stepped portion 8g, so that the drive ring 8 is rotated. It is prevented from coming off.

Further, the end surface 8c is provided with through holes 8e, 8e which function as mounting portions for mounting the locking pieces 21 constituting the second member of the locking member described later.
The through holes 8e, 8e are provided at different angular positions from the straight groove 8f. Also, the through holes 8e, 8
The acute angle θ formed by e and the optical axis is set in correspondence with the movable angle range of the locking piece 21, that is, the rotation allowable angle range of the drive ring 8. Further, the through hole 8e has a rectangular opening cross section. As a result, the locking piece 21 can be formed thin as will be described later.

The locking piece 21 is, as shown in FIGS.
It is composed of a member having an L-shaped cross section. Specifically, for example, it can be formed by punching a metal piece into a desired shape and bending it into an L shape. Locking piece 2
Of course, 1 is not limited to a metal piece, but may be a plastic piece or a ceramic piece. Further, as shown in FIGS. 5 and 7, the locking piece 21 is divided into two at one end side. This is to have elasticity. The outer surfaces on both sides of the divided end portion are provided with slightly protruding locking portions 21d, respectively. This locking part 2
As shown in FIG. 5, 1d engages with the opening end of the through hole 8e and locks when the tip of the locking piece 21 is inserted into the through hole 8e and projected to the opening end on the opposite side. The piece 21 itself is prevented from coming off. Further, on the other end side of the locking piece 21, the recess 21c is formed.
Are provided on both outsides. This is a cushioning member 22 described later.
It is used as an engaging part to prevent the slipping off when the is attached.

The locking piece 21 includes the above-mentioned protrusion 2e,
It constitutes a regulating member. That is, the protruding portion 2e serves as a first member provided on the fixed portion 2 side that is a fixed member, and the locking piece 21 is provided on the drive ring 8 side that is a rotating member.
It becomes a member. By the way, in this embodiment, the protrusion 2e is
Although they are provided in three places, not all of them work as a regulating member. In this example, as shown in FIG. 3, the two protruding portions 2e (A) and 2e (B) function as a regulating member. That is, the protrusions 2e (A) and 2e (B) located at the positions sandwiching the through holes 8e, 8e provided as the attachments between the adjacent protrusions serve as the first member of the regulating member.

The buffer member 22 is provided in the shape of a rectangular tube as a whole, and the other end of the locking piece 21 is inserted inside the tube. The buffer member 22 is formed of an elastic material such as rubber. Inside the cushioning member 22, a convex portion 22a that engages with the concave portion 21c of the locking piece 21 is provided. When the locking piece 21 is inserted through the buffer member 22, the recess 2
The convex portion 22a is fitted in the 1c, and the protruding portion 21b that relatively projects with respect to the concave portion 21c locks the convex portion 22a,
Prevent it from coming off.

By attaching the buffer member 22 to the locking piece 21, it is possible to suppress the generation of impact noise when the locking piece 21 comes into contact with the side surface of the protrusion 2e. The attachment of the buffer member 22 may be omitted if the generation of impact noise between the locking piece 21 and the protrusion is not a concern.

Next, the mounting of the drive ring 8 on the fixed portion 2 and the operation of limiting the turning range by the regulating member will be described.

First, the drive ring 8 is attached to the fixed portion 2. As shown in FIG. 2, the protrusions 2e are positioned so that the protrusions 2e are fitted in the corresponding rectilinear grooves 8f, and the drive ring 8 is pushed toward the camera body along the optical axis. As a result, each protruding portion 2e is relatively displaced along the corresponding straight-moving groove 8f and moves to the tip side of the drive ring 8, and the step portion 8h of the drive ring 8 engages with the tubular body portion 2g. And then stop. In this state,
The drive ring 8 is rotatably supported by the protrusion 2e and the tubular body 2g. Here, the drive ring 8 is rotated clockwise, for example, as shown in FIG. In this state, the step portion 8g of the drive ring 8 is locked to the projecting portions 2e at three places, so that the drive ring 8 is prevented from coming off.

Next, in this state, the locking pieces 21 are attached to the through holes 8e (A), 8e (B) provided at two places, as shown by phantom lines in FIG. As described above, the elastic member 22 is attached to the locking piece 21 in advance. In order to attach such a locking piece 21 to the through hole 8e, the two divided tips 21a are slightly compressed in the directions toward each other while being inserted into the through hole 8e to penetrate the through hole 8e. The other end of the hole 8e is projected. This allows
As shown in FIGS. 5 and 6, the locking piece 21 includes the locking portion 2
1d engages with the open end of the through hole 8e to prevent the locking piece 21 itself from coming off.

In this way, the drive ring 8 and the regulating member are mounted on the fixed portion 2. As shown in FIG.
In this state, when the drive ring 8 rotates clockwise, the protrusion 2e (A) locks the locking piece 21 attached to the through hole 8e (A). On the other hand, when the drive ring 8 rotates counterclockwise, the protruding portion 2e (B) locks the locking piece 21 attached to the through hole 8e (B). That is, the movement of the locking piece 21, that is, the rotation of the drive ring 8 is allowed within the range of the angle θ formed by the through hole 8e (A) and the protrusion 2e (B).

At this time, when the elastic member 22 is attached to the locking piece 121, even if the locking piece 21 comes into contact with the protruding portion 2e, the elastic member 22 absorbs the impact at the time of contact. It is possible to suppress the generation of impact sound such as metallic sound.

The drive ring 8 can be removed by performing the procedure reverse to that of the above mounting.

Thus, in the above embodiment, the fixed portion 2
The drive ring 8 can be mounted by pushing it in the optical axis direction, and after the drive ring 8 is rotated, the locking piece 21 is inserted into the through hole 8
By pushing it into e, the drive ring and the regulating member can be easily attached. Moreover, the assembly operation at this time is
It can be done only in the optical axis direction. That is, continuous assembly can be performed by the pushing operation in the optical axis direction and the rotating operation around the optical axis. Therefore, the assembling process can be simplified, and automation can be facilitated accordingly.

In the above embodiment, the locking piece 21 is mounted on the drive ring 8 which is a rotating member, but it may be mounted on the fixed portion 2 side. In that case, a portion corresponding to the protruding portion 2e may be provided on the drive ring 8 side to configure the regulating member. Further, both the fixed side and the rotating side may have a structure in which locking pieces are mounted. However, if only one locking piece is provided and the other is integrally provided with the member,
This is preferable because the number of parts to be assembled can be reduced.

[0044]

According to the present invention, a member for limiting the turning range of the turning member can be mounted from the optical axis direction, so that the work is simplified and the workability is improved, and the automation is improved. Can be easy.

[Brief description of drawings]

FIG. 1 is a sectional view of a lens barrel showing an embodiment of the present invention.

FIG. 2 is a front view showing the state where the drive ring is fitted in the fixing member of the embodiment along the optical axis from the front side of the lens barrel.

[Fig. 3] After fitting a drive ring into the fixing member of the embodiment,
It is a front view which shows the state which rotated the drive ring so that it might not come off, from the front side of a lens barrel.

FIG. 4 is a partial cross-sectional view showing a state in which the drive ring of the embodiment is fitted in the fixed portion.

FIG. 5 is an enlarged plan view showing a state in which a locking piece is attached to a drive ring with a part broken away.

FIG. 6 is an enlarged plan view showing a state where the locking piece is attached to the drive ring.

FIG. 7 is a plan view showing an example of a locking piece used in the present invention.

FIG. 8 is a front view showing an example of a locking piece used in the present invention.

FIG. 9 is a side view showing an example of a locking piece used in the present invention.

FIG. 10 is a cross-sectional view showing an example of an elastic member attached to the locking piece.

[Explanation of symbols for main parts]

2 ... Fixed part 2e ... projection 2f ... Drive ring support 8 ... Drive ring 8c ... end face 8e ... through hole 8f ... Straight groove 8g ... Step 21 ... Locking piece 22 ... Buffer member

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-1-252911 (JP, A) JP-A-3-279929 (JP, A) Actually open 6-55140 (JP, U) Actually open 61- 4914 (JP, U) Actually open 61-38622 (JP, U) Actually open 55-169503 (JP, U) Actually open 3-31710 (JP, U) Actually Kohei 5-31606 (JP, Y2) (58) Fields surveyed (Int.Cl. ⁷ , DB name) G02B ⁷ /02-7/16

Claims (11)

(57) [Claims] 1. A fixing member, the base end side of which is fixedly attached to a lens mounting portion of a camera body, and a rotating member which is attached to the fixing member in the optical axis direction and is rotatably supported. In the lens barrel including a restriction member that restricts a rotation range of the rotation member, the restriction member includes a first member provided on the fixed member side,
A second member provided on the rotating member side, and at least one of the first member and the second member is detachably attached in the optical axis direction to a fixed member or a rotating member on which the first member and the second member are provided, The fixed member or the rotating member to which the first member or the second member is detachably provided has an attachment portion for attaching the first member or the second member, and the first member and the second member are A lens barrel characterized by restricting rotation of a rotating member by abutting against each other. 2. The fixing member according to claim 1, wherein the fixing member has a slip-out prevention portion for preventing the mounted rotation member from slipping off, and the rotation member avoids slipping-out prevention by the slip-out prevention portion, A lens barrel having an attachment / detachment portion for attaching / detaching the rotating member to / from a fixing member. 3. The lens barrel according to claim 2, wherein at least the rotating member is formed of a tubular body and is fitted on the outer periphery of the fixed member. 4. The pullout preventing portion according to claim 3, comprising a protruding portion that protrudes in a radial direction on the tip side of the fixing member, and a radius of an imaginary circle inscribed with the tip of the protruding portion is the rotating member. A lens barrel characterized by being larger than the inner radius of. 5. The lens barrel according to claim 4, wherein the projecting portion is provided at a position where a circumferential side surface of the projecting portion contacts the second member, and also functions as the first member. 6. The lens barrel according to claim 3, wherein the mounting portion is provided on the rotating member and is arranged at an angular position different from that of the attachment / detachment portion. 7. The mounting portion according to claim 6, wherein the mounting portion is a through hole that opens in an end surface of the rotating member and extends in the optical axis direction,
A lens barrel provided at a plurality of positions on an end face of a rotating member. 8. The locking member according to claim 7, wherein the second member is a locking piece having an L-shaped cross section, and one end of the locking piece is attached to the mounting portion with the other end extending inward. A lens barrel characterized by that. 9. The lens barrel according to claim 8, wherein a buffer member is attached to the other end side of the locking piece. 10. The first member and the second member according to claim 1.
The lens barrel is characterized in that the other member of the members is integrally provided in advance with a fixed member or a rotating member on which the member is to be provided. 11. The lens barrel according to claim 1 or 10, further comprising a buffer member at a contact portion of at least one of the first member and the second member with which the first member and the second member are in contact. .