JP4307634B2 - Mirror frame adjustment device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lens frame adjustment device that adjusts the position of a guide member that guides a frame member of a lens frame.
[0002]
[Prior art]
Conventionally, a method for fixing a guide member in a zoom lens barrel disclosed in Japanese Patent Application Laid-Open No. 62-150211, which has been proposed as a lens frame device having a guide member for moving the lens frame forward and backward, A method is adopted in which a bush, which is a rod sliding guide member, is inserted into the hole, and an adhesive is injected into the fitting gap for fixing.
[0003]
[Problems to be solved by the invention]
In the above-mentioned Japanese Patent Application Laid-Open No. 62-150211, there is no particular mention of a technique for adjusting the position of the bush (guide member) with respect to the lens frame. However, in order to improve the yield of the lens frame and the sliding characteristics of the lens frame, it is indispensable to adjust the relative position of the bush to the lens frame, and the lens frame can be finely adjusted with a simpler structure. There is a need for an adjustment device. A similar adjustment device is also desired for a mechanism having a movable member other than the lens frame.
[0004]
The present invention has been made in order to solve the above-described problems. The position of the shaft-shaped or tubular guide member with respect to the frame member can be finely adjusted with a simple mechanism, and the adjustment accuracy is high and low. An object of the present invention is to provide a cost-effective lens frame adjusting device.
[0005]
Lens frame adjustment device according to claim 1, wherein the present invention includes a frame member, provided in the frame member, a shaft-like or tube-like guiding member for guiding the upper Kiwaku member, in a plane perpendicular to the optical axis for causing the displacement of the guide member in two directions perpendicular to each other, a first parallel spring portion consisting of a deformable two parallel plates provided along the optical axis direction, the first of said guide member In addition to the displacement due to the deformation of the parallel spring portion, the guide member is further displaced in one of the two directions in the optical axis direction and the plane. And a second parallel spring portion composed of two parallel plates provided perpendicular to the optical axis.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view of a main part of a lens barrel incorporating a lens frame adjusting device according to a first embodiment of the present invention. 2 is an enlarged exploded perspective view of the first and second group lens frames built in the lens barrel. FIG. 3 is a longitudinal sectional view of the lens barrel as viewed from the optical axis direction. Note that the left-right direction orthogonal to the lens optical axis O is the X direction, and the left direction is the plus (+) side for position adjustment. The vertical direction is the Y direction, and the downward direction is the plus (+) side for position adjustment.
[0009]
The lens barrel of this embodiment is capable of fine adjustment of the position of a movement guide member (sleeve) attached to the lens frame, and its configuration is mainly fixed to the main body as shown in FIG. A linear guide frame 1 supported in this manner, a cam ring 2 that is rotatably supported on the outer periphery of the linear guide frame 1, and a linear lens that is inserted into the linear guide frame 1 so as to be linearly movable. It consists of a first group lens frame 3 and a second group lens frame 4 which are frame members (bases) for holding the eighth and second group lenses 9, respectively.
[0010]
The rectilinear guide frame 1 is provided with three rectilinear guide grooves 1a, 1b, 1c and a screw adjusting hole 1g. The cam ring 2 is provided with a first group lens cam groove 2b, second group lens cam grooves 2d, 2e, and 2f, and a screw adjusting hole 2g. By rotating the cam ring 2 with respect to the rectilinear guide frame 1, the first and second lens groups 8 and 9 are driven forward and backward.
[0011]
The first group lens frame 3 has a sleeve 7 as a tubular guide member (moving guide member) into which the main guide shaft 5 is slidably fitted, and the sleeve 7 is fixed, and the sleeve position adjustment for adjusting the position thereof Part (lens frame adjusting device) 20, a notch 3a into which the auxiliary guide shaft 6 for rotation prevention is slidably fitted, a cam follower 3b, and an annular recess 3d for centering between the lens frames. . The cam follower 3b is slidably fitted into the rectilinear guide groove 1b of the rectilinear guide frame 1, and is further slidably fitted into the cam groove 2b of the cam ring 2.
[0012]
Three cam followers 4a, 4b, 4c are fixed to the outer periphery of the second group lens frame 4, and a main guide shaft 5 and a sub guide shaft 6 are held in a direction parallel to the lens optical axis O. It is fixed. An annular convex part 4d for centering that is precisely fitted (fitting in a minute gap state) to the concave part 3d of the first group lens frame 3 is provided around the lens holding part.
[0013]
The main guide shaft 5 and the sub guide shaft 6 are slidably fitted into the sleeve 7 and the notch 3a of the first group lens frame 3. The cam followers 4a, 4b, and 4c are slidably fitted into the rectilinear guide grooves 1a, 1b, and 1c of the rectilinear guide frame 1, and are also slidable into the cam grooves 2d, 2e, and 2f of the cam ring 2. Inserted.
[0014]
As shown in FIGS. 2 and 3, the sleeve position adjusting unit 20 is provided integrally with the sleeve 7 as a guide member, the adjusting screws 11 and 12 as pressing means, and the upper part of the first group lens frame 3. It consists of a deformed part. The adjusting unit 20 adjusts the relative position of the sleeve 7 with respect to the first lens group frame 3 on a plane orthogonal to the main guide shaft 5.
[0015]
The deforming portion includes two parallel leaf spring portions (parallel spring mechanism) 3e that rise in the optical axis O direction and upward (Y direction), and a protruding portion that faces the parallel spring portion 3e. An adjustment screw threading screw portion 3g provided on the flat plate portion 3j for connecting the parallel leaf spring portion 3e, and an upper portion of the flat plate portion 3j along the X direction perpendicular to the optical axis O and upward (Y direction). 2) parallel leaf spring portions (parallel spring mechanism) 3f that rises in the upper part of the flat plate portion 3j, and an adjustment screw threading screw portion 3h that is provided on a projection portion facing the parallel leaf spring portion 3f above the flat plate portion 3j; It comprises the sleeve fixing hole 3i disposed on the parallel leaf spring 3f.
[0016]
Next, an assembling operation including sleeve position adjustment in the lens barrel of the present embodiment configured as described above will be described with reference to enlarged views of the sleeve position adjustment unit 20 in FIGS. . However, FIG. 4 (A) is an enlarged view of the sleeve position adjusting unit 20 as viewed from the optical axis direction, and FIG. 4 (B) is a view taken in the direction of arrow A in FIG. 4 (A). Prior to the adjustment and assembly, the sleeve 7 is fixed to the hole 3i of the first group lens frame 3 by adhesion or press fitting.
[0017]
First, each cam follower of the second group lens frame 4 is inserted into the rectilinear guide frame 1 while being fitted into the rectilinear guide groove of the rectilinear guide frame 1. Further, the first group lens frame 3 is inserted into the rectilinear guide frame 1 while the cam follower is fitted into the rectilinear guide groove, and at the same time, the main guide shaft 5 is fitted into the sleeve 7 and the sub guide shaft 6 is fitted into the notch 3a. .
[0018]
The second group lens frame 4 and the first group lens frame 3 are brought close to each other with the respective shafts inserted as described above, and the annular convex portion 4d is fitted with the annular concave portion 3d. At that time, if the fitting is not performed or the fitting is not easy, the X-direction adjusting screw 11 and the Y-direction adjusting screw 12 are screwed in to adjust the position of the sleeve 7 with respect to the first group lens frame 3.
[0019]
That is, when the adjustment screw 11 for X direction is screwed by a driver through the adjustment hole 1g by a certain angle, the parallel leaf spring portion 3e is deformed in the X direction, and the sleeve 7 is connected to the optical axis O as shown in FIG. It moves (displaces) in the X (+) direction with respect to the first group lens frame 3 while maintaining the parallel state. At the same time, a minute amount δy0 changes (displaces) in the Y (+) direction.
[0020]
Next, when the Y-direction adjusting screw 12 is screwed in at a certain angle from the optical axis O direction, the parallel leaf spring portion 3f is deformed in the optical axis O direction, and the sleeve 7 has the optical axis as shown in FIG. While maintaining a state parallel to O, the first group lens frame 3 is displaced in the direction of the optical axis O and simultaneously moved (displaced) in the Y (+) direction.
[0021]
As described above, the annular convex portion 4d is securely fitted to the annular concave portion 3d by displacing the sleeve 7 with respect to the first lens group frame 3 by the X-direction movement amount δx and the Y-direction movement amount δy0 + δy. If the state is obtained, it is assumed that the optical axes O of the first group lens frame 3 and the second group lens frame 4 coincide with each other and the position of the sleeve 7 is adjusted. Adhering and fixing to finish the adjustment.
[0022]
Note that the position of the hole 3i in which the sleeve 7 of the first group lens frame 3 fits in the state before the sleeve position adjustment is relative to the optical axis O, compared to the normal position, the X (−) direction is the same as the dimension of component variation. And it is offset in the Y (−) direction so that the position can always be adjusted in the direction in which the adjusting screws 11 and 12 are screwed.
[0023]
After the above adjustment, the cam ring 2 is fitted into the straight guide frame 1 to complete the assembly. However, the sleeve position can be adjusted through the screw adjustment holes 2g and 1g even when the cam ring 2 is fitted, and by adjusting the adjustment screws 11 and 12 from the optical axis direction. Alternatively, the adjustment can be made in the same manner even when only the first group lens frame 3 and the second group lens frame 4 are inserted into the straight guide frame 1.
[0024]
In the above-described embodiment, the annular concave and convex portions that are fitted to each other are applied in order to align the optical axes O of the first and second group lens frames. However, the present invention is not limited to this, and other fitting portions are used. In addition, the sleeve position may be adjusted while optically aligning the optical axis without using the fitting portion.
[0025]
As described above, according to the lens barrel of the first embodiment, it is possible to finely adjust the frame member at the position of the sleeve, which is a tubular guide member, by a mechanism having a simple structure, and the adjustment accuracy is high and low. A costly lens barrel adjustment device is obtained.
[0026]
Next, a description will be given of a lens barrel that incorporates a lens barrel adjustment device according to a second embodiment of the present invention.
FIG. 5 is an enlarged exploded perspective view of the first and second group lens frames incorporated in the lens barrel of the present embodiment.
[0027]
In the lens barrel of the present embodiment, the main guide shaft is fixed to the first group lens frame side with respect to the lens barrel of the first embodiment, and the main guide shaft slides to the second group lens frame side. Is fixed, and the position of the main guide shaft is finely adjusted with respect to the first group lens frame by the shaft position adjusting device. The structure other than the above has the same structure as that of the first embodiment, and only different parts will be described below. However, the same structural member is demonstrated using the same code | symbol.
[0028]
The first group lens frame 13 is provided with a main guide shaft 15 that is a shaft-shaped guide member, and a shaft position adjusting unit (lens frame adjusting device) 21 that fixes the main guide shaft 15 and adjusts its position. In addition, similarly to the first group lens frame 3, a notch 3a, a cam follower 3b, and an annular recess 3d for centering between the lens frames are provided.
[0029]
A sleeve 7 into which the main guide shaft 15 is slidably fitted is fixed to the second group lens frame 4, and in addition, as with the second group lens frame 4, three cam followers 4 a, 4 b, 4 c, The sub guide shafts 6 are fixed to each other, and a centering annular convex portion 4d is provided.
[0030]
As shown in FIG. 5, the shaft position adjusting unit 21 includes a main guide shaft 15 fixed to the shaft hole 3k, adjustment screws 11 and 12 as pressing means, and the same as the first group lens frame 3. It is comprised with the deformation | transformation part which has a shape. In the adjusting unit 21, the position of the main guide shaft 15 is adjusted on a plane orthogonal to the axis.
[0031]
Next, the position adjusting operation of the main guide shaft in the lens barrel of the present embodiment configured as described above will be described.
Similarly to the case of the sleeve 7 in the first embodiment, the position of the main guide shaft 15 is adjusted by screwing the adjusting screws 11 and 12 to deform the parallel spring portions 3e and 3f. While maintaining a state parallel to the optical axis O, the first group lens frame 13 is adjusted by being displaced in the X direction and the Y direction. In this state, as in the case of the first embodiment, if the first group lens frame 13 and the second group lens frame 4 are brought close to each other and a state where the annular convex portion 4d and the concave portion 3d are securely fitted is obtained, The optical axis O coincides and the adjustment is finished.
[0032]
As described above, according to the lens barrel of the second embodiment, it is possible to finely adjust the position of the main guide shaft, which is a shaft-shaped guide member, with respect to the first group lens frame by a mechanism having a simple structure. A lens frame adjustment device with high adjustment accuracy can be obtained at low cost.
[0033]
Each of the above embodiments is applied as a lens barrel adjusting device for a lens barrel, but is not limited thereto, and is a position adjusting device for a base of a moving guide member of a base that is relatively advanced and retracted. Also, the gist of the present invention can be applied, and the same effect can be obtained.
[0034]
Based on the above embodiment,
1. The base,
A member for relatively moving the base, a movement guide member capable of relative displacement with respect to the base;
A parallel spring mechanism for displacing the movement guide member relative to the base;
Pressing means for pressing the parallel spring mechanism;
Proposing an adjusting device characterized in that a displacement of the moving guide member in a direction perpendicular to at least one direction in which the parallel spring mechanism is pressed by the pressing means is an object to be adjusted. it can.
[0035]
According to the adjusting device, it is possible to finely adjust the position of the movement guide member with respect to the base by a mechanism having a simple structure, and it is possible to provide an adjusting device with high adjustment accuracy and low cost.
[0036]
【The invention's effect】
As described above, according to the present invention, the position of the shaft-shaped or tubular guide member with respect to the frame member can be finely adjusted by a mechanism having a simple structure, the adjustment accuracy is high, and the lens frame adjustment device is low in cost. Can be provided.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a main part of a lens barrel incorporating a lens barrel adjustment device according to a first embodiment of the present invention.
FIG. 2 is an enlarged exploded perspective view of a first and second group lens frame built in the lens barrel of the first embodiment.
FIG. 3 is a longitudinal sectional view of the lens barrel of the first embodiment viewed from the optical axis direction.
4 is an enlarged view of a sleeve position adjusting unit in the lens barrel of the first embodiment, and FIG. 4A is an enlarged view of the sleeve position adjusting unit viewed from the optical axis direction; (B) is an A arrow view of FIG. 4 (A).
FIG. 5 is an enlarged exploded perspective view of a first and second group lens frame built in a lens barrel according to a second embodiment of the present invention.
[Explanation of symbols]
3,13 ...... 1 group lens frame (frame member)
7 …… Sleeve (tubular guide member)
15 …… Main guide shaft (shaft-shaped guide member)
20 …… Sleeve position adjustment section (Adjustment mechanism)
21 …… Shaft position adjustment unit (adjustment mechanism)

Claims (1)

A frame member;
Provided in the frame member, a shaft-like or tube-like guiding member for guiding the upper Kiwaku member,
Order to displacement of the guide member in two mutually perpendicular directions in the plane orthogonal to the optical axis, a first parallel spring portion consisting of parallel plates two deformable provided along the optical axis direction ,
In addition to the displacement associated with the deformation of the first parallel spring portion of the guide member, the guide member is further displaced in one of the two directions in the optical axis direction and the plane. A second parallel spring portion comprising two parallel plates provided at an upper portion of the parallel spring portion and orthogonal to the optical axis;
A lens frame adjustment device comprising:

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