JP3597291B2 - Moving mechanism - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a moving mechanism such as a lens moving mechanism built in a zoom lens barrel of a camera, and more particularly to a moving mechanism that facilitates assembly.
[0002]
[Prior art]
A moving mechanism provided with a cam on one of an operating member and a driven member and a cam follower on the other is used for mechanical operation parts requiring linear movement in various devices such as camera lenses.
[0003]
Conventionally, a zoom drive structure of a zoom lens barrel of a camera as an example thereof is provided on a fixed barrel 30, a zoom cam ring 31 fitted in the fixed barrel 30, and the outermost circumference of the barrel as shown in FIG. Each of the guide pins 34 provided on a plurality of lens moving frames 33 (only one moving frame is shown in the figure) having a zoom operation ring 32 and contributing to zooming is moved to a linear guide 35 provided on the fixed barrel 30. And a cam groove 36 provided in the zoom cam ring 31 and a zoom interlocking pin 37 extending from the zoom operation ring 32 is connected to the zoom cam ring 31 in general. Reference numeral 38 denotes a focus cam ring.
[0004]
In the above-described conventional configuration, when the zoom operation ring 32 is rotated, the movement is transmitted to the zoom cam ring 31 via the zoom interlocking pin 37. By the rotation of the cam ring 31, the guide pins 34 of the lens moving frames 33 are guided by the cam grooves 36 corresponding to the guide pins 34 and the rectilinear guides 35 of the fixed barrel 30. Move in the optical axis direction.
[0005]
By the way, in the above-mentioned conventional zoom drive structure, a bayonet structure 39 as shown in FIG. 10A is widely used as a coupling means between the fixed cylinder 30 and the cam ring 31. In the case of this bayonet structure 39, one of the fixed cylinder 30 and the cam ring 31 (the cam ring 31 in the figure) is provided with an L-shaped engagement groove 40, and the other is provided with a pin-shaped engagement piece 41, and assembled. In this state, the engagement piece 41 is slidably engaged within a certain range of the engagement groove 40, and by restricting the movement range of the engagement piece 41, the guide pin 34 serving as a cam follower is controlled. Is restricted within the cam groove 36.
[0006]
[Problems to be solved by the invention]
However, in the case of the above-described conventional combination structure of the fixed cylinder and the cam ring with the bayonet structure, as shown in FIG. 10B, when the cam ring 31 is mounted on the fixed cylinder 30 at the time of assembly, first, an L-shape is required. The engaging piece 41 is inserted from the vertical groove 40a of which one end of the engaging groove 40 is open, and then the engaging piece 41 is guided to the lateral groove 40b. When setting the movement area, the stoppers 42 must be mounted at two positions, that is, a corner portion continuous with the vertical groove portion 40a of the horizontal groove portion 40b and a moving end.
[0007]
For this reason, when assembling, it is necessary to incorporate both the bayonet structure, the cam and the guide pin at the same time, and a certain judgment is required to determine the installation position, and the number of assembling steps increases accordingly. In addition, since the bayonet structure is inevitably determined by the positions of the cams and the straight guides, there are problems that not only the degree of freedom in design is restricted but also that the structure cannot be complicated. Was. Note that the above problem can also occur in a moving mechanism applied to various devices other than the lens barrel of the camera.
[0008]
The present invention has been made to solve the above problems, and has as its object to provide a moving mechanism that can be simplified in structure and that is easy to assemble.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, in a moving mechanism having two or more sets of cams each including an operating member, each of the cam mechanisms including each of the cams has an over area not used after assembling at both ends. In addition, one driven member can be incorporated in the one end over region, and the operation of the operation member achieves movement to the other end over region, and another driven member in the other end over region. By being configured to be able to be incorporated, the assembling position can be easily understood at the time of assembling, and the number of assembling steps can be reduced.
[0010]
Further, in each of the plurality of cam mechanisms, a drive regulating member for regulating the drive region is provided in a range not including the over-end region at both ends, whereby it is possible to prevent the cam mechanism from moving to the over region during normal use.
[0011]
Further, as the above configuration applied to a lens barrel of a camera, two or more sets of cams each including a rotation operation ring and including a plurality of cams and a plurality of lens moving frames respectively engaged with the corresponding cams. In each of the moving mechanisms, each of the cam mechanisms has an over-wide area at one end and an over-tele area at the other end, so that one lens moving frame can be incorporated in the over-wide area. By achieving the movement to the over-telephoto area by the rotation of the rotation operation ring, and by being configured to be able to incorporate another lens moving frame in the over-telephoto area, the installation position is at both ends of the rotation operation ring, It is intended to make it easy to grasp the installation position, to assemble easily, and to reduce man-hours.
[0012]
Further, a rotation restricting means for restricting the driving area is provided in a range not including the over-wide area and the over-tele area of the cam, and the rotation restricting means is provided on a fixed cylinder fitted in a rotating operation ring. A restricting groove, and a rotation restricting member inserted from the rotation operation ring toward the rotation restriction groove. After assembling the rotation operation ring and the lens moving frame, inserting the rotation restriction member into the rotation restriction groove. By doing so, there are no restrictions on assembly and there are few restrictions on design.
[0013]
Further, by configuring the rotation restricting member to be fixed to the rotation restricting groove by a single screw, the member can be easily stopped with one screw. Since the restricting member is prevented from rotating in the rotation restricting groove, the force in the loosening direction applied to the screw is greatly reduced, and the screw is not easily loosened.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a zoom lens barrel according to the present invention will be described with reference to the drawings. FIG. 1 shows the outer appearance of a zoom lens barrel according to the present embodiment and a camera equipped with the same. A camera C shown in this figure is a single-lens reflex camera in which a plurality of types of photographing lenses are detachable, and has an AF (automatic focus adjustment) function and an AE (automatic exposure adjustment) function. At the center, a lens mounting mount M is formed. Although not shown, a power supply battery for supplying power to a drive system, a display system, a photometric system, and the like of the camera and lens is detachably mounted in the body B.
[0015]
2 and 3 show the zoom lens barrel L of the present embodiment. FIG. 2 shows each component, and FIG. 3 shows an assembled state. The zoom lens barrel L shown in these figures includes a first lens group G1 fixedly supported by the first group holding frame 1 and a second lens group G2 fixedly supported by the second group holding frame 2. The zooming is performed by the movement of the first and second lens groups G1 and G2 in the optical axis direction, and the focusing is mainly performed by the movement of the first lens group G1 in the optical axis direction. I have. Reference numeral 3 denotes a fixed cylinder, 4 denotes a zoom operation ring, 5 denotes a focus feeding cylinder, and 6 denotes a zoom feeding cylinder. FIG. 4A shows the zoom operation ring 4, FIG. 4B shows the zoom feeding cylinder 6, and FIG. 4C shows the fixed cylinder 3.
[0016]
The first group holding frame 1 is mounted on the focus feeding cylinder 5 so as to be movable in the optical axis direction. Moreover, although not shown, the first group holding frame 1 is provided with a gear which meshes with helicoid gears example, a focusing motor provided on the Bode I side via a helicoid gear, the drive transmission mechanism and coupler Are combined. At the time of focusing, the focusing motor is driven based on the data detected by the AF unit, and its output is transmitted to the helicoid gear via a coupler and a drive transmission mechanism, so that the first group holding frame 1 is optically driven. Driven in the axial direction.
[0017]
Further, by electrically connecting a distance ring (not shown) to the focusing motor or mechanically coupling the distance ring to the helicoid gear, the focusing motor is driven by manually operating the distance ring. Alternatively, the helicoid gear is driven to rotate, and manual focusing is performed.
[0018]
The focus feeding cylinder 5 is connected to the zoom feeding cylinder 6. In the zoom feeding cylinder 6, a first group cam follower 7 and a first group rectilinear projection 8 each formed of a curved ridge are formed at different positions on the outer peripheral surface, and the first group cam follower is formed. 7 engages with a first group cam 9 formed on the inner peripheral surface of the zoom operation ring 4, and a first group rectilinear projection 8 is formed on a first group rectilinear portion formed on the inner peripheral surface 3 of the fixed cylinder 3. It is engaged with the guide groove 10.
[0019]
The second group holding frame 2 is provided with three linear guide pieces 11 extending radially at three equally divided parts on the outer periphery. These straight guide pieces 11 are formed at three equally divided parts on the peripheral surface of the fixed cylinder 3. In addition to engaging with the second group straight guide groove 12, it also engages with the second group lead groove 13 formed on the inner circumferential surface 3 of the zoom operation ring 4. Each of the rectilinear guide pieces 11 is formed with a spring portion 11a whose central portion in the radial direction is formed in a U-shape. The elasticity of the rectilinear guide pieces 11 is imparted by the spring portions 11a. 11 comes into contact with the second group lead groove 13 with an optimal urging force.
[0020]
A rotation restricting groove 14 for restricting the rotation range of the zoom operation ring 4 is formed between each of the second group straight guide grooves 12 of the fixed barrel 3, while the peripheral surface 3 of the zoom operation ring 4 and the like are formed. An insertion hole 15 is formed in each of the minute portions. As will be described later, after the rotation restricting member 16 (see FIG. 7) is inserted into these insertion holes 15, the rotation restricting member 16 is fixed by screws 17, and the rotation restricting member 16 faces the rotation restricting groove 14. By contacting both ends, further rotation of the zoom operation ring 4 is restricted at the wide end and the telephoto end.
[0021]
In the zoom lens barrel L having the above-described configuration, unlike the related art, a cam or a cam follower of a cam mechanism is integrally formed on the zoom operation ring 4 itself, so that the zoom operation ring 4 functions as an operation ring and a zoom cam ring. Therefore, the number of parts can be reduced, and the lens barrel can be downsized. The components of the cam mechanism are exposed in the form of holes on the surface of the zoom operation ring 4 , and these holes are formed on the outer peripheral surface of the operation ring 4 as shown in FIG. It is covered by a non-slip member 18 that is fitted, so that it is not exposed to the outside.
[0022]
When performing the zooming operation, the rotation of the zoom operation ring 4 is transmitted to the first and second group holding frames 1 and 2 via the cam mechanism without passing through the cam ring. That is, when performing a zoom operation from the wide-angle side to the telephoto side or in the opposite direction, when the zoom operation ring 4 is manually rotated, the first group cam follower 7 follows the rotation of the first group cam 9, whereby the zooming is performed. The feeding cylinder 6 and the first group holding frame 1 are integrally moved in the optical axis direction by being guided by the first group straight guide groove 10 in the optical axis direction. At the same time, the second group linear guide piece 11 is driven by the rotation of the second group lead groove 13 of the zoom operation ring 4, whereby the second group holding frame 2 is guided by the second group linear guide groove 12 in the optical axis direction. Accordingly, the second group holding frame 2 is integrally guided in the optical axis direction, and zooming is performed.
[0023]
In the above configuration, the first group cam 9 is configured by a sandwiching cam. As shown in FIG. 2, the first group cam 9 composed of the sandwiching cam has a square hole 9a provided at one end of the zoom operation ring 4 at a predetermined position where the three holes are equally divided. A pair of sandwiching pieces 9b projecting toward the inner diameter side are integrally formed at the portion, and the first group cam follower 7 of the zoom feeding cylinder 6 formed of a curved ridge is sandwiched between the sandwiching pieces 9b on both sides. It is configured to lead.
[0024]
As described above, by using the sandwiching cam having the sandwiching pieces 9b that are opposed to each other in the axial direction of the zoom operation ring 4, it is possible to use a mold that is split in two in the axial direction at the stage of manufacturing the zoom operation ring 4. Therefore, there is an advantage that it can be manufactured by a simple and inexpensive mold. For convenience of explanation, the cam structure on the zoom feeding cylinder 6 side is referred to as a cam follower 7, and the cam structure on the zoom operation ring 4 side is referred to as a cam 9, but it can be said that the cam and the cam follower are relative names.
[0025]
Next, a configuration and an assembling procedure for assembling the zoom lens barrel L having the above configuration will be described. As shown in FIG. 4A, a driving area is provided in the second group lead groove 13 of the zoom operation ring 4. Has an over-telephoto area to which continues from the telephoto end and an over-wide area wo which continues from the wide end of the drive area. As shown in FIG. 4 (C), the first group cam follower 7 of the zoom feeding cylinder 6 is located between the second group straight guide grooves 12 of the fixed cylinder 3 so as to face the first group cam follower 7. A notch 19 is formed so that the cam 7 and the first group cam 9 can be exposed to the outside in a parallel state.
[0026]
When the zoom lens barrel 6 incorporating the first lens group G1, the first lens group holding frame 1, and the focus lens barrel 5 is incorporated into the fixed barrel 3 and the zoom operation ring 4, as shown in FIG. With the first group cam follower 7 of the feeding cylinder 6 facing the notch 19, the zoom feeding cylinder 6 is fitted into the fixed cylinder 3 and the zoom operation ring 4 fitted on the outer diameter side of the fixed cylinder 3 is moved to the tele side. By rotating, the over tele area to of the second group lead groove 13 coincides with the tele end of the first group cam follower 7 of the zoom feeding cylinder 6. In this state, the first group cam 9 is arranged in the notch 19 of the fixed barrel 3 on the extension of the wide end of the first group cam follower 7, and the zoom operation ring 4 is rotated to the wide side from here. Then, the first group cam follower 7 is sandwiched and engaged with the first group cam 9, whereby the structure of the first group is incorporated in the lens barrel.
[0027]
Next, when assembling the second group holding frame 2 for holding the second lens group G2 into the fixed barrel 3 and the zoom operation ring 4, as shown in FIG. The zoom operation ring 4 is further rotated to the wide side until the over-wide area wo of the second group lead groove 13 of the zoom operation ring 4 overlaps the end of the second group straight guide groove 12 of the cylinder, and then the overlap is made. By inserting the second group straight guide piece 11 from the portion, the configuration of the second group can be incorporated in the lens barrel.
[0028]
In this manner, the over-wide area wo and the over tele area to are provided in the cam mechanism, and in these areas wo and to, the configuration of the first and second groups is incorporated. Is easy to understand, and the number of assembly steps can be reduced.
[0029]
When the first group and the second group have been assembled into the lens barrel as described above, the rotation restricting member 16 is inserted into the insertion hole 15 of the zoom operation ring 4 as shown in FIGS. By screwing, the rotation of the zoom operation ring 4 is restricted within the range of the rotation restricting groove 14 of the fixed barrel 3, thereby preventing over-wide and over-television.
[0030]
The rotation restricting member 16 has, for example, an octagonal top shape as shown in the drawing, and has a screw hole 20 formed at the center thereof, and a rotation preventing projection 21 provided at an upper surface portion passing through the screw hole 20. It becomes. On the other hand, the insertion hole 15 of the zoom operation ring 4 is provided in a range not including the over-wide area and the over-tele area of the cam mechanism, and is formed in a square shape having a vertical and horizontal dimension capable of receiving the rotation regulating member 16. And a horizontal hole 15b having a height substantially equal to the thickness of the rotation restricting member 16. The upper surface of the horizontal hole 15b is opened to the fitting portion 15a, and the rotation preventing protrusion of the rotation restricting member 16 is formed. A detent groove 22 is formed to allow insertion of the insert 21.
[0031]
When fastening the rotation restricting member 16 to the insertion hole 15, the rotation restricting member 16 is inserted into the fitting portion 15a and then slid into the horizontal hole 15b. As a result, the rotation restricting member 16 enters the rotation restricting groove 14 of the fixed cylinder 3 and the detent protrusion 21 engages with the detent groove 22 to prevent the rotation. By fixing the screw 17 to the screw hole 20 of the rotation restricting member 16 from this state, the rotation restricting member 16 is prevented from rotating in the rotation restricting groove 14, so that the force in the loosening direction applied to the screw 17 is greatly reduced. , Less likely to loosen.
[0032]
It is needless to say that the present invention can be applied not only to the above-described zoom lens barrel, but also to mechanical operation parts and the like that require linear movement in various kinds of devices.
[0033]
【The invention's effect】
As described above, according to the first aspect of the present invention, in a moving mechanism having two or more sets of cams each including an operating member, the cam mechanisms including the respective cams are not used at both ends after assembly. It has a region, and one driven member can be incorporated in the one end over region, and by operating the operation member, movement to the other end over region is achieved, and another end member is moved in the other end over region. Since the driven member is configured to be able to be assembled, the assembling position can be easily understood at the time of assembling, so that the number of assembling steps can be reduced.
[0034]
According to the second aspect, in each of the plurality of cams, a drive regulating member for regulating the drive region is provided in a range not including the over-end region at both ends. You can do so.
[0035]
Claim 3 is applied to a lens barrel of a camera, wherein two or more sets of cams are provided with a rotating operation ring and include a plurality of cams and a plurality of lens moving frames respectively engaged with the corresponding cams. In the moving mechanism according to the above configuration, each of the cam mechanisms has an over-wide area at one end and an over-tele area at the other end, so that one lens moving frame can be incorporated in the over-wide area. At the same time, the rotation of the rotation operation ring achieves movement to the over-telephoto area, and another lens moving frame can be incorporated in the over-telephoto area so that the installation position is at both ends of the rotation operation ring. Therefore, the installation position can be easily grasped, the assembling work can be facilitated, and the number of steps can be greatly reduced.
[0036]
According to the fourth aspect, a rotation restricting means for restricting the driving area is provided in a range not including the over-wide area and the over-tele area of the cam, and the rotation restricting means is provided on a fixed cylinder fitted in the rotation operation ring. A rotation restricting groove provided, and a rotation restricting member inserted from the rotation operation ring toward the rotation restricting groove. After assembling the rotation operation ring and the lens moving frame, the rotation restricting member is moved to the rotation restricting groove. Since there is no restriction on assembly, there are few restrictions on design.
[0037]
According to the fifth aspect, since the rotation restricting member is configured to be fixed to the rotation restricting groove by a single screw, the rotation restricting member can be easily stopped by one screw. In addition, in the state where the screw is fixed by the screw, the rotation restricting member is prevented from rotating in the rotation restricting groove, so that the force in the loosening direction applied to the screw is greatly reduced, and the screw is not easily loosened.
[Brief description of the drawings]
FIG. 1 is an external perspective view showing an example of a zoom lens barrel and a camera equipped with the same according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view showing components of the zoom lens barrel.
FIG. 3 is a half sectional view schematically showing the assembled state.
FIG. 4 is a development view showing (A) a zoom operation ring, (B) a zoom feeding cylinder, and (C) a fixed cylinder.
FIG. 5 is a development view showing the first group incorporated.
FIG. 6 is a development view showing a state in which the second lens unit is incorporated.
FIG. 7 is an exploded perspective view showing a rotation restricting member and an insertion hole.
FIG. 8 is a sectional view showing the assembled state.
FIG. 9 is a sectional view showing a schematic configuration of a conventional example.
FIG. 10 is a schematic diagram showing a conventional bayonet structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st group holding frame 2 2nd group holding frame 3 Fixed cylinder 4 Zoom operation ring 5 Focus feeding cylinder 6 Zoom feeding cylinder 7 First group cam follower 8 First group straight protrusion 9 First group cam 10 First group straight guide groove 12 second group straight guide groove 13 second group lead groove 14 rotation restriction groove 15 insertion hole 16 rotation restriction member 17 screw G1 first lens group G2 second lens group L zoom lens barrel

Claims (5)

In a moving mechanism having two or more sets of cams each including an operating member, each of the cam mechanisms including each of the cams has an over area which is not used after assembling at both ends, and one driven area is formed in one over area. Movement characterized in that the member is configured to be able to be incorporated, and by operating the operation member, movement to the other end over region is achieved, and another driven member can be incorporated in the other end over region. mechanism. The moving mechanism according to claim 1, wherein in each of the plurality of cam mechanisms, a drive regulating member that regulates a drive region is provided in a range that does not include a region where both ends are over. In a moving mechanism having two or more sets of cams including a rotating operation ring and including a plurality of cams and a plurality of lens moving frames engaged with the corresponding cams, each of the cam mechanisms has an overwide end at one end. In addition to having an area, the other end has an over tele area, so that one lens moving frame can be incorporated in the over wide area, and movement to the over tele area is achieved by rotation of the rotary operation ring. A moving mechanism characterized in that another lens moving frame can be incorporated in the over-telephoto area. A rotation restricting means for restricting the driving area is provided in a range not including the over-wide area and the over-telescopic area of the cam mechanism, and the rotation restricting means includes a rotation restricting means provided on a fixed cylinder fitted in the rotation operation ring. The moving mechanism according to claim 3, further comprising a groove, and a rotation restricting member inserted from the rotation operation ring toward the rotation restriction groove. The moving mechanism according to claim 4, wherein the rotation restricting member is configured to be fixed to the rotation restricting groove by a single screw.

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