JP3385655B2 - Anti-sway device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shake prevention device suitable for use in a camera or the like to prevent image shake due to camera shake.

[0002]

2. Description of the Related Art Recent cameras are highly automated due to remarkable digitization in various parts such as an automatic exposure mechanism and an autofocus mechanism. However, in this type of camera, there is a countermeasure against image shake due to camera shake that is likely to occur during handheld shooting, etc., which is insufficient as an attempt for automation.

For this reason, in this type of camera, in order to prevent image shake caused by camera shake, particularly camera shake or tilt, the shake condition of the camera is detected by shake detecting means, and the detection result is detected. A shake prevention device having a structure in which the photographing lens system (main optical system) or a part of the optical system is used as a shake prevention optical system (shake prevention lens), and is shifted in a direction orthogonal to the optical axis. However, it is conventionally known.

That is, in a camera having such a shake prevention function, a shake prevention optical system (hereinafter referred to as a shake prevention lens) which constitutes at least a part of a photographing lens system is movably supported, and this shake prevention lens is used. By moving in a direction that absorbs shake in a plane orthogonal to the optical axis of the main optical system, the deviation of the image forming position due to shake is corrected,
It was to eliminate the image blur.

In such an anti-shake apparatus, as a drive mechanism for shifting the anti-shake lens, a mechanism portion such as disclosed in Japanese Patent Laid-Open No. 3-110530 is proposed.

In this conventional example, the lens frame of the shake prevention lens is held so as to be movable in the direction orthogonal to the optical axis, and the lens frame is provided with drive means (motor, gear train, lever or screw shaft, steel ball and V). The anti-vibration lens is directly driven and moved by causing the driving force from the groove portion) to act via the connecting means (by the rod member or the driving shaft) that transmits the pressing force and the pulling force.

[0007]

By the way, according to the above-mentioned conventional example, the regulation of the drive of the shake prevention lens in the x-axis direction is provided in the steel ball and the lens frame member provided in the drive member on the y-axis side. On the other hand, the drive in the y-axis direction is restricted by the steel ball portion provided on the drive member on the x-axis side and the V groove portion provided on the lens member.

However, in the above-mentioned conventional structure, for example, if each driving member is composed of one steel ball, resistance to displacement of the lens frame member accompanied by rotation about the optical axis is caused. The force is extremely weak, and the accurate driving force in the x-axis direction and the driving force in the y-axis direction of the lens frame member are entangled with each other, and the accurate driving force in the x-axis direction and y direction of the lens frame member
Driving in the axial direction becomes difficult.

In order to prevent such a problem, for example, two steel balls or a plurality of steel balls may be provided in each driving member, and each V groove may be supported with a certain width. . However, with such a structure, this time becomes a mechanism of excessive restraint having four or more restraint points, and it is difficult to secure smoothness in driving the lens and the mounting position accuracy of each part, which makes it difficult to manufacture. In consideration of such a point, it is desirable to take some measures so that the anti-shake lens can be driven in a desired direction smoothly and stably with high accuracy. .

In particular, when the lens frame is connected to the driving members on the x-axis side and the y-axis side by the above-mentioned four-point contact, the contact pressure is partially increased due to manufacturing error or assembly error of each part. This leads to excessive restraint, causing so-called one-sided contact, causing one-side wear and rolling force at each contact part, and unnecessary stress to each part due to imbalance in the driving force transmitting part. The problem that smooth and stable driving on the x-axis and y-axis cannot be obtained is unavoidable, and it is desired to take some measures to eliminate such problems.

The present invention has been made in view of the above circumstances, and the position of the shake-preventing lens can be detected with high accuracy by a simple and inexpensive structure, and the shake-preventing lens can be smoothly moved in a desired driving direction. It is an object of the present invention to obtain a shake prevention device that can perform stable driving with high accuracy.

[0012]

In order to meet such a demand, a shake preventing apparatus according to the present invention comprises a shake preventing optical system that is moved to prevent image shake, and an optical axis that prevents this shake preventing optical system. Urging means for urging the anti-shake optical system in the first and second directions, and first and second driving means for generating the amount of movement of the shake prevention optical system in the first and second directions. First and second transmission means for respectively transmitting the movement amount to the shake prevention optical system, and the shake prevention optical system in a state in which the movement amount in each direction is received from the transmission means and the movement amount can be moved to the other transmission means. A guide means for restricting the degree of freedom other than the movement in a predetermined direction in one of the first and second transmission means. Is provided and the other transmission means has a predetermined A guide means having a degree of freedom other than the movement toward the direction is provided, and the guide means has a guide function for giving the first transmitting means a degree of freedom in the second direction or the second transmitting means. It is provided with at least one of the guide functions for giving the degree of freedom in the first direction.

Further, in the shake preventing apparatus according to the present invention, a shake preventing optical system that is moved to prevent image shake, drive means that generates a movement amount in a predetermined direction, and the movement amount shakes. Transmission means for transmitting to the prevention optical system, and the shake prevention optical in a state of receiving a movement amount in a predetermined direction from the transmission means and being movable relative to the transmission means in a direction substantially perpendicular to the predetermined direction. The transmission means is provided on the system side, and the transmission means is provided with adjusting means capable of adjusting the mounting positional relationship with the transmission means. Here, the transmitted means is configured to receive the movement amount at two locations with respect to the transmission means, and the adjusting means is configured such that at least one of the two locations receiving the movement amount of the transmitted means is in the movement direction. It may be configured to be changeable along the line.

Further, according to the present invention, the adjusting means capable of adjusting the mounting positional relationship with the second transmitting means is attached only to the second transmitted means. here,
The second transmitted means is configured to receive the movement amount in the second direction at two places with respect to the second transmission means, and the adjusting means is provided at the two places to receive the movement amount of the second transmitted means. It is preferable that at least one of the positions can be changed along the second direction.

Further, according to the present invention, the first transmitted means and the first transmitted means are configured to transmit the movement amount at a plurality of points, and the second transmitted means and the second transmitted means. The transmission means is configured to transmit the movement amount at only one place.

[0016]

According to the present invention, by urging the anti-shake optical system in the optical axis direction, there is no problem that the anti-shake optical system tilts to deteriorate the optical properties. Further, when the shake prevention optical system is provided with the first and second driving means, the transmitting means and the transmitted means, one of the transmitting means is restricted from moving in a direction other than the predetermined direction, and the other is slightly moved. By giving the degree of freedom, the excessive restrained state between the transmitting means and the transmitted means is relaxed, thereby stabilizing the contact pressure at each abutting part, preventing one-sided contact, one-sided wear, and driving. It is possible to prevent unnecessary stress from being generated in each portion due to the imbalance of the force transmitting portion, and it is possible to drive the x-axis and the y-axis smoothly and stably. Further, by providing the guide having the degree of freedom in the second or first direction when driving the transmitting means in the first or second direction, it is possible to avoid an excessive restraint state in the transmitted means. .

Further, according to the present invention, by providing the adjusting means for adjusting the mounting positional relationship between the transmitted means and the transmitting means, the contact pressure at each part is stabilized,
Smooth and stable driving in each direction is possible.

Further, according to the present invention, a stable contact pressure can be obtained by adjusting the number of transmitting portions between the transmitted means and the transmitting means, so that a problem due to an excessively restrained state does not occur. Can be done.

[0019]

1 to 6 show an embodiment of a shake preventing device according to the present invention. In these drawings, first, a photographing lens system with a lens shutter to which the present invention is applied is provided. The schematic configuration of the camera will be briefly described with reference to FIG.

That is, the taking lens system 2 which is the main optical system in the camera indicated by reference numeral 1 as a whole has a first lens group 4 and a second lens group 9 consisting of front and rear lens groups 7 and 8.
And a third lens group 11, and is configured as a zoom lens.

Here, the first lens group 4 is constructed by holding three lenses 4a, 4b and 4c on the lens frame 3. The second lens group 9 is composed of a total of seven lenses by holding three lenses, four lenses 7a, 7b, 7c; 8a, 8b, 8c, 8d in the lens frames 5, 6. . The third lens group 11 is configured by holding three lenses 11a, 11b, 11c on the lens frame 10.

Reference numeral 12 in the drawing denotes a lens shutter, which is provided between the front and rear lens groups 7 and 8 of the above-mentioned second lens group 9, and is provided with shutter curtains 13 and 14 and a drive unit for driving the same. It is composed of 15 parts. The drive unit 1
5 is arranged in the second lens group 9 on the outer periphery of the lens frame 5 of the front lens group 7, and the shutter curtains 13 and 14 are provided.
Is disposed immediately before the rear lens group 8 that functions as an image blur prevention lens described later.

Further, reference numeral 16 in the drawing denotes the first, second and third lens groups 4, 9, which constitute the above-mentioned taking lens system 2.
An image forming surface of a film on which a subject image is formed by 11 and I in the drawing is an optical axis of the taking lens system 2.

According to this embodiment, the taking lens system 2 having the three lens groups 4, 9 and 11 as described above.
In FIG. 1, by shifting the rear lens group 8 of the second lens group 9 in the direction orthogonal to the optical axis I as an image blur prevention lens, the results are shown in FIGS. 1, 2A, 3 and 4. The image blur preventing mechanism 20 as described above is used to move the image formed on the image forming surface 16 in accordance with the image blur state.

Such an image blur preventing mechanism 20 is shown in FIG.
4 and 6, as is apparent from FIG. 6, the substrate 21 on the lens shutter 12 side is provided as a base member in the space on the outer peripheral side of the rear lens group 8 in the second lens group 9.

In such an image blur preventing mechanism 20, the rear lens group 8 (hereinafter referred to as the shake preventing lens 8) in the second lens group 9 has a lens frame, as is apparent from FIGS. It is fixedly held in the unit 6.
Further, the opening 21 of the substrate 21 is provided on the outer peripheral portion of the lens frame 6.
A flange portion 6a is provided at a portion facing the portion a.

Then, as is apparent from FIGS. 1 and 4, balls 70, 71, 72, which are positioned and held by the through holes of the retainer member 68, are provided at the opposing portions of the flange portion 6a and the substrate opening portion 21a. A receiving member 67 made of a high hardness material such as hardened steel for receiving 73,
69 is attached. The balls 70, 71, 72,
73 is held in a state of being sandwiched by these receiving members 67 and 69, whereby the lens frame 6 is provided with the substrate via the flange portion 6a, the receiving member 67, and balls 70 to 73 (transmitted means). 21 is movable with respect to the opening 21a.

That is, the retainer member 68 is formed with through holes in which the balls 70, 71, 72, 73 are rotatably held therein, which are arranged at equal intervals in the circumferential direction. Further, the lens frame 6 has arms 6f and 6g provided on a part of its outer peripheral portion.
The springs 51 and 52 are bridged between the base plate 21 and the base plate 21, so that the receiving members 67 and 69 are connected to the balls 70 to 70.
It is always in contact with 73.

With such a structure, the shake prevention lens 8
Is movably supported in a plane orthogonal to the optical axis I with a low load, and is constantly urged by the springs 51 and 52, so that there is no problem of tilting and degrading optical performance. In FIG. 4, the balls 70, 71
Although not shown in only two places, the opening 2 of the substrate 21
As shown in FIG. 1, the balls 72 and 73 are preferably arranged at four locations around the flange 1a around the periphery 1a.

In FIG. 1, reference numerals 30 and 31 denote x-axis and y-axis DC motors (Mx, in the figure) serving as driving means for moving the image blur prevention lens 8 in the x-axis direction and the y-axis direction.
My is attached), and is attached and fixed to the substrate 21 side. Further, 32 and 33 are those motors 30 and 31.
Gears 32a, 32b, 32c, 3 for transmitting driving force from
2d; 33a, 33b, 33c, 33d is a reduction gear train that serves as a rotation transmission means, and its rotation is transmitted to the first and second shafts 34, 35. These first and second shafts 3
Reference numerals 4, 35 denote bearing portions 21b, 21 provided on the substrate 21.
It is rotatably supported by c or 21d and 21e so as to extend in the x-axis direction or the y-axis direction.

Incidentally, the gears 32b constituting the gear trains 32, 33 for transmitting the rotations from the motors 30, 31 described above,
32c; 33b and 33c are rotatably fixed on the substrate 21, respectively, and the gears 32d and 33d are provided on the shaft 3 respectively.
It is configured to be rotatable integrally with 4, 35.

Reference numerals 36 and 37 denote movable members serving as transmission means on the x-axis side and the y-axis side, and female thread portions 36a and 37a provided on the movable members 36 and 37, respectively, are external thread portions 34 of the shafts 34 and 35.
a, 35a, and the feed screw mechanism by this, moves the lens frame 6 through the movable members 36, 37 to the x-axis,
A movement amount generation mechanism unit for moving in the y-axis direction is configured.

Further, the guide member 5 is provided on each of the movable members 36 and 37 adjacent to the female screw portions 36a and 37a.
5,56 are fixed. As shown in FIG. 2, the guide members 55, 56 are attached to the bearing portions 21b, 21d or 21c, 21e of the substrate 21 by the shaft 34,
It is guided by guide shafts 57 and 58 provided in parallel with 35. Therefore, the movable members 36 and 37 are moved in the x-axis direction and the y-axis direction by the motors 30 and 31, respectively.

Here, the guide shafts 57 and 58 are attached by different methods, as is apparent from FIG. 2A and FIGS. 2B and 2C. That is, the guide shaft 58 on one side (the guide means on the y-axis side in this embodiment) is securely fixed to the bearing portions 21d and 21e of the substrate 21 by the shaft holes 35c and 58a.

The other guide shaft 57 (on the x-axis side in this embodiment) has a shaft hole 34 for the bearing portion 21c of the substrate 21.
Although the mounting position is constrained by a, the shaft is supported, but the bearing 21b is not constrained by the elongated hole 57a and is mounted in a movable state in the circumferential direction.

These are rollers 59, 60; 61, 6 mounted on the flange portion 6a of the lens frame 6 as described later.
This is because the movable member 36 and the movable member 36 are brought into contact with the movable members 36 and 37 at four points so as to avoid an excessively restrained state.

If the guide shaft 57 is securely fixed to the substrate 21 and is axially supported similarly to the guide shaft 58, the angular relationship between the movable members 36 and 37 is fixed. In such a state, the movable members 36, 37
In consideration of the component dimensional tolerances of the rollers 59, 60; 61, 62 and the flange portion 6a of the lens frame 6, the contact portions of the rollers 59, 60; 61, 62 and the movable members 36, 37 at the four points are all familiar. There is no guarantee of good contact.

In other words, according to the present invention, such an excessively restrained state causes the movable members 36 and 37 and the rollers 59 and 60;
Prevents from being caused by the contact state between 1, 62,
As a result, in order to optimize the relationship between the lens frame 6 and the movable members 36 and 37, one of the movable members 36 is
The guide shaft 57 is mounted on the side in the rattling state described above.

Here, as is apparent from FIGS. 1 and 3, the roller 5 is provided on the flange portion 6a of the lens frame 6 described above.
9, 60, 61, 62 are roller shafts 63, 64, 65,
It is rotatably attached by 66. Further, as shown in FIGS. 1 and 4, between the spring hook portion 6b of the lens frame 6 on the opposite side of the rollers 59 and 60, the spring hook portion 6c on the opposite side of the rollers 61 and 62, and the substrate 21. , Each spring 5
3, 54 are bridged in substantially the same direction as the x-axis direction and the y-axis direction, which are the movable directions of the movable members 36, 37.
The rollers 59, 60 and 61, 62 are abutting portions 36b, 36c or 37b, 3 having a substantially L-shaped cross section at the tips of the movable members 36, 37, respectively.
7c is contacted by the biasing force of the springs 53 and 54.

Further, as described above, since the mounting portions of the guide shafts 57 and 58 are devised, the movable members 36 and 37 of the rollers 59, 60 and 61, 62 are made.
The contact pressure to the contact portions 36b, 36c and 37b, 37c of the roller is stable, preventing uneven contact, increasing the amount of rolling wear of each roller, unbalance of the driving force transmitting portion, and unnecessary use for each portion. It is possible to prevent generation of various stresses.

Therefore, according to the above-mentioned structure, smooth and stable high-precision driving in the x-axis and y-axis driving directions is possible. It should be noted that one guide shaft 58 is firmly fixed to the substrate 21, and the spring 54 is provided with a lens so that the rollers 61 and 62 can roll stably with respect to the contact portions 37b and 37c of the movable member 37. Since the frame 6 is biased, instability in the x-axis and y-axis driving directions does not occur.

Therefore, the shake prevention lens 8 described above is used.
Shifts following the moving direction of the movable member 36 (x-axis direction) by the motor 30 on the x-axis side, but is free in the y-axis direction. Further, this shake prevention lens 8 is
The movable direction of the movable member 37 (y
It shifts following the (axial direction), but is free in the x-axis direction. From this, the shake prevention lens 8 is
It is possible to shift in all directions inside one opening 21a.

Further, the lens frame 6 is provided by the springs 53 and 54.
The lens frame 6 and the movable members 36, 37 are always in contact with each other by urging the movable members 36, 37 in substantially the same directions as the x-axis direction and the y-axis direction, which are the movable directions.
As a result, the movements of the movable members 36 and 37 can be reliably transmitted to the lens frame 6.

Further, due to the urging force of the springs 53 and 54,
The rattling of the shafts 34 and 35 in the thrust direction is caused by the rattling of the male threads 34a and 35a of the shafts 34 and 35 and the female threads 36a and 37a of the movable members 36 and 37, respectively. You can always take in the direction. Therefore, the driving force of each of the motors 30 and 31 can be accurately and reliably transmitted to the shake prevention lens 8.

In this embodiment, instead of the movable support of the lens frame 6 by the movable members 36 and 37 via the above-mentioned four rollers 59 to 62, one of the guide shafts 57 is replaced by the guide shaft 57. Although the mounting position of the substrate 21 is constrained with respect to the bearing portion 21c, but the mounting position is restrained with respect to the bearing portion 21b, the following advantages are achieved.

That is, with such a structure, the movable member 3 supported by the guide shaft 58 in a completely fixed state.
Although the combination of 7 and the lens frame 6 via the rollers 61 and 62 is immovable, the other guide shaft 57 is movable and the rollers 59 and 60 on this side have a degree of freedom. The constraint condition by the four rollers 59 to 62 between the lens frame 6 and the movable members 36 and 37 can be relaxed. That is, since the movable member 36 can be swung to some extent by the guide shaft 57, the excessive restrained state is released, and the familiar four-point contact state is obtained.

In FIG. 1, reference numerals 80x and 80y denote limiting gears, which are used to move the motors 30 and 31 to the movable members 36 and 37.
In the driving force transmission means for moving the lens frame 6 via the gears 32d, a part of the reduction gear trains 32, 33,
33d is a portion that is meshed with and serves as a limiting means for limiting the transmission of the driving force in the transmission system within a certain range, and is rotatably supported by bearings 21f and 21h provided on the substrate 21. ing. Here, the rotation is limited to the gear 80.
A groove 80 having a substantially C-shape that is provided on the back side of x, 80y.
xa, 80ya and convex portions 21g, 21i projecting from the gear bearing portions 21f, 21h exposed in the grooves 80xa, 80ya. Therefore, according to such a configuration, each limiting gear 80x, 80
The rotation of y is mechanically limited where it does not rotate 180 degrees in both directions.

Further, in FIGS. 1 and 5, 40x, 40y
Are discs with holes 41x, 4 which are provided integrally with the gears 32a, 33a and have a large number of holes at equal intervals in their peripheral portions.
Reference numeral 1y denotes a photo interrupter provided on the substrate 21 side by sandwiching the peripheral portions of the discs 40x and 40y with holes. These photo interrupters 41x and 41y form discs 40x. Four
The number of holes on the 0y side is detected as a pulse signal, and by counting this, the movement of the motors 30, 31 and the position and speed of the shake prevention lens 8 are detected.

According to the image blur prevention mechanism section 20 having the above-mentioned structure, the rear lens group (anti-vibration lens) 8 of the second lens group 9 shown in FIG. 6 is arranged in the direction orthogonal to the lens optical axis I. By shifting, the image formed on the image forming surface 16 can be moved in a desired state, and as a result, image blur can be prevented.

Further, according to the image blur prevention mechanism section 20 described above, the DC motors 30 and 31 having a relatively large volume have a positional relationship in which the longitudinal direction thereof is orthogonal to the optical axis I of the photographing lens group 2. As can be seen from FIGS. 2 and 3, the DC motors 30 and 31 are connected to the lens shutter 12 and the third lens group 1 as shown in FIGS.
It is not necessary to project it to the first side, and it is possible to assemble the shake prevention lens 8 onto the outer peripheral side of the lens frame 6 in a high density and compact form, which is advantageous in terms of structure and assembly.

Therefore, according to such an image blur prevention mechanism section 20, the space of the lens shutter 12 and the distance between the second lens group 9 and the third lens group 11 are not damaged. In addition, since it can be easily unitized as described above, it is excellent in assembling, and is very effective even if it is arranged adjacent to the diaphragm mechanism in, for example, an interchangeable taking lens.

In the above-described structure, the first and second motors 30 and 31 are movably arranged in the annular space formed in the outer peripheral portion of the lens frame 6 of the shake prevention lens 8. The first and second movable members 36,
Since they are arranged at positions deviated in the circumferential direction from 37 in such a manner that their respective longitudinal directions have a positional relationship orthogonal to the optical axis I, despite the simple mechanical structure,
The DC motors 30 and 31 serving as drive means can be arranged without projecting to the outside, and the shake prevention mechanism portion 20 can be configured as a unit to reduce the space and cost of the mechanism portion 20. There are advantages.

Such an advantage is that the output shafts of the motors 30 and 31 are arranged so as to face the x-axis direction and the y-axis direction, respectively, and the rotational force of the output shafts of the motors 30 and 31 is first and First and second shafts 34, 35 serving as second converting means
Further, the first and second movable members 36 and 37 are configured to be converted into linear motions in the x-axis direction and the y-axis direction, respectively, so that they can be further exerted.

Further, in the above-described structure, the shake prevention mechanism section 20 uses the case member composed of the substrate 21 and the lid body 22 in the annular space formed on the outer peripheral side of the lens frame 6 of the shake prevention lens 8. It is configured as a unit and has a small size, so that other complicated mechanical parts such as the lens shutter 12 illustrated in FIG. 6 are required to be arranged adjacent to each other. It can be used to exert an effect.

7 (a) and 7 (b) show a second embodiment of the present invention, in which the same or corresponding parts as those of the above-mentioned embodiment are designated by the same reference numerals and detailed description thereof is omitted. To do.
Here, in this embodiment, although detailed illustration is omitted, the movable members 36 and 37 are provided with guide shafts 57 and 58 together with the shafts 34 and 35, thereby being configured to be movable in a predetermined direction. ing.

The guide shaft 57 and the other guide shaft 58 are the bearing portions 21b, 21d or 21c, 2 of the substrate 21 as in the case of FIG. 2B in the above-mentioned embodiment.
It is securely fixed to 1e. Further, rollers 59, 60, 61, 62 are rotatably attached to the flange portion 6a of the lens frame 6 by roller shafts 63, 64, 65, 66.

Among such rollers 59 to 62, at least one of the rollers 59 is shown in FIG.
As shown in (b), a roller position adjusting member 81, which is an eccentric cam that is configured to be rotatable and displaceable on a roller shaft 63 (by a screw member), is axially mounted as an adjusting means. The roller 59 is mounted on the shaft. Then, by adjusting the rotational position of the roller shaft 63, the mounting position of the roller 59 can be freely adjusted, as is clear from FIG.

In such a structure, the mounting position of the roller 59 with respect to the flange portion 6a is adjusted by the rotational position of the roller position adjusting member 81 accompanying the rotation of the roller shaft 63, whereby the four rollers 59, 60, 61,
62 can be brought into close contact with the movable members 36 and 37 at four points, which makes it possible to avoid an excessively restrained state as in the above-described embodiment, prevent uneven contact, and prevent the roller from rolling. It is possible to prevent unnecessary stress from being generated in each part due to the imbalance of the one-sided part.

That is, when the movable members 36 and 37 and the lens frame 6 are combined through the four rollers 59 to 62, the three parts come into contact with each other in a predetermined state, but the remaining one part is misaligned. It is easy to occur. Therefore, by using the adjusting means described above, the contact condition of the roller at the remaining one place is adjusted, and the contact state which is familiar by the four-point contact is secured as a whole, and the excessive restrained state described above is avoided. You can

Although the adjusting structure using the roller position adjusting member 81 of the roller 59 shown here is a fixed attachment position adjustment with respect to the flange portion 6a, a method of pressing with a spring may be used. Further, in FIG. 7A, reference numeral 36d is a roller shaft 6 formed by a screw member
It is a window portion for rotationally adjusting the 3 and is effective when the adjustment is performed after the assembly.

Furthermore, in the above-described embodiment, one of the rollers corresponding to the movable member 36 on the x-axis side is adjustable, but any of the four rollers may be adjustable. If the roller 59 is adjustable in the above-described embodiment position, the advantage that the adjustment stroke is small can be obtained.

FIG. 8 shows a third embodiment of the present invention. It should be noted that this drawing shows only the main parts, and in this drawing, the same parts as those shown in FIGS. Also in this embodiment, similarly to the second embodiment described above, the guide shaft 57 and the other guide shaft 58 are provided, and these guide shafts 5 are provided.
7, 58 are bearing portions 21b, 21d or 2 of the substrate 21.
It is securely fixed to 1c and 21e.

In FIG. 8, rollers 59 are provided on the x-axis side and the y-axis side of the flange portion 6a of the lens frame 6.
b and 61, 62 are roller shafts 63b and 65, 66
It is rotatably mounted by. The three rollers 59b; 61, 62 are connected to the movable members 36, 3
It comes into contact with 7 at three points.

That is, in this embodiment, instead of contacting the movable members 36, 37 on the x-axis side and the y-axis side with the lens frame 6 by four rollers, one roller 59b is provided on one side.
Contact only with the lens frame 6 with respect to the movable members 36 and 37.
Is contacted and supported at three points. Then, with such a configuration, it becomes possible to solve the problem relating to an excessively restrained state and the like due to the conventional contact of four rollers.

In other words, in such a structure, the movable member 3 can be contacted by three points via the rollers 59b; 61, 62.
Since 6 and 37 are supported by the lens frame 6, it is possible to prevent uneven contact, prevent partial contact, and prevent partial wear of the roller and increase in the amount of rolling.

In this embodiment, driving in the x-axis direction is performed by using the rollers 61 and 62 as a guide, and driving in the y-axis direction is performed by using the roller 59b as a guide. Therefore, the familiarity of the lens frame 6 with the movable members 36 and 37 is dominated by the stable contact of the rollers 61 and 62. Therefore, the force of the spring 54 may be made stronger than that of the spring 53.

Further, in the above-mentioned embodiment, the movable member 3
Of the 6, 37, the shape of one movable member 36 is changed,
Although the structure is such that only one roller 59b is engaged,
It is needless to say that the present invention is not limited to this, and the movable member 37 having the same shape as the other movable member 37 may be used and only the roller may not be interposed. Further, it is needless to say that the side having one roller described above is not limited to the x-axis side and may be the y-axis side. In short, in order to prevent an excessively restrained state, it is good to adopt a three-point contact structure instead of four points.

The present invention is not limited to the structure of the above-described embodiment, and the image blur prevention mechanism section 2 constituting the image blur prevention device.
It goes without saying that the shape, structure, etc. of each part including 0 can be appropriately modified and changed.

For example, in the above-mentioned embodiment, the structure of the transmission system on the x-axis side is improved to make the guide shaft 57 movable, and the position of at least one roller 59 is adjusted by the roller shaft position adjusting member 81 by the eccentric cam. Although the case where the roller is freely configured or one roller is eliminated is shown, the applicable point may be the y-axis side, and an appropriate modification may be considered.

Further, in the above-described embodiment, the case where the present invention is applied to the camera having the lens shutter 12 has been described, but the present invention is not limited to this, and image blur due to camera shake or the like is prevented in a conventionally known camera. In order to do
Needless to say, it can be applied to an anti-shake lens that shifts in a direction orthogonal to from, and is not limited to the structure on the camera side.

Further, the shake prevention device according to the present invention is not limited to the above-mentioned camera, but can be applied to various optical instruments, devices, etc. to exert its effect.

[0072]

As described above, according to the shake preventing apparatus of the present invention, the shake preventing optical system that is movable for preventing image shake and the shake preventing optical system are biased in the optical axis direction. Urging means, first and second driving means for generating a movement amount of the shake prevention optical system in the first and second directions,
First and second transmission means for transmitting the movement amounts of the first and second drive means to the shake prevention optical system, respectively,
The first and second transmitted means, which are provided on the shake prevention optical system side so as to be movable to the other transmitting means while receiving the moving amount in the respective directions from the respective transmitting means, One of the second transmission means and the second transmission means is provided with guide means for restricting the degree of freedom other than the movement in the predetermined direction, and the other transmission means has the degree of freedom other than the movement in the predetermined direction. Equipped with a guide means
The guide means has at least one of a guide function that gives the first transmission means a degree of freedom in the second direction and a guide function that gives the second transmission means a degree of freedom in the first direction. Therefore, despite the simple configuration,
It has various excellent effects as follows.

That is, by urging the shake prevention optical system in the optical axis direction, the shake in the optical axis direction is suppressed regardless of the driving of the shake prevention optical system. In addition, by optimizing the contact pressure of each part between the transmitted means and the transmitting means, it prevents uneven contact due to stable contact pressure, wear on one side of each part, an increase in rolling force amount, and an unbalance in the driving force transmitting part. It is possible to prevent unnecessary stress from being generated in each part due to the balance, so that smooth and stable driving in the x-axis direction and the y-axis direction can be performed with high accuracy, and quiet and stable driving can be obtained.

Further, according to the shake preventing apparatus of the present invention, the transmitted means is provided with the adjusting means capable of adjusting the mounting positional relationship with the transmitting means, and the transmitted means is further provided to the transmitting means. By configuring the adjusting means to receive the movement amount and changing the position of at least one of the two adjusting means to receive the movement amount of the transmitted means along the movement direction, The mounting position relationship with the transmission means is adjusted to stabilize the contact pressure at each part, and smooth and stable driving in each direction is possible.

Further, according to the present invention, the first transmitted means and the first transmitted means are configured to transmit the movement amount at a plurality of points, and the second transmitted means and the second transmitted means. Since the moving amount of the transmitting means is transmitted only at one place, a stable contact pressure can be obtained by adjusting the number of transmitting portions between the transmitted means and the transmitting means, which results in an excessive restrained state. It is possible to prevent problems caused by.

[Brief description of drawings]

FIG. 1 shows an embodiment of a shake prevention device according to the present invention,
FIG. 3 is a cross-sectional view of a main portion of a shake prevention mechanism portion that is a main portion in a lens barrel portion of a camera.

2A is a sectional view taken along line II-II in FIG. 1, FIG.
(C) is a schematic view seen from the direction of arrows IIb and IIc in FIG. 1.

3 is a sectional view taken along line III-III in FIG.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is an enlarged view of a main part for explaining a position detecting unit of a shake prevention lens.

FIG. 6 is a schematic configuration diagram for explaining a schematic configuration of a camera with a lens shutter that is suitable for applying the shake prevention device according to the present invention.

FIG. 7 is an enlarged view of a roller portion for explaining a second embodiment of the present invention, in which (a) is an enlarged cross-sectional view of a main part and (b) is a schematic side view thereof.

FIG. 8 is a schematic diagram showing a relationship between a lens frame and a movable member according to a third embodiment of the present invention.

[Explanation of symbols]

1 camera 2 Shooting lens 4 First lens group 6 Lens frame (lens frame member) 6a Flange part 7 front lens group 8 Rear lens group (anti-shake lens) 9 Second lens group 11 Third lens group 12 lens shutter 15 Shutter driver 16 Image plane 20 Image blur prevention mechanism 21 board 21a opening 30 x-axis DC motor (driving means) 31 y-axis DC motor (driving means) 32 Drive force transmission gear train (reduction gear train) 32d gear 33 Drive force transmission gear train (reduction gear train) 33d gear 34 First axis 34a Male thread 35 Second axis 35a male thread 35c shaft hole 36 x-axis side movable member 36a Female thread 36c shaft hole 37 Y-axis side movable member 37a Female thread 40x disc with holes 40y disc with hole 41x photo interrupter 41y photo interrupter 51 spring 52 spring 53 spring 54 spring 55 Guide member 56 Guide member 57 Guide shaft 57a Long hole as shaft hole 58 Guide shaft 58a shaft hole 59 Laura 59a roller 60 roller 61 Laura 62 Laura 63 roller shaft 64 roller shaft 65 roller shaft 66 roller shaft 67 Receiving member 68 Retainer member 69 Receiving member 70 balls 71 balls 80 limited gear 81 Roller position adjusting member by eccentric cam I Optical axis of shooting lens system

─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-63-49729 (JP, A) JP-A-4-68323 (JP, A) JP-A-3-110529 (JP, A) JP-A-3- 110530 (JP, A) JP-A-3-84506 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G03B 5/00 G02B 27/64

Claims (6)

(57) [Claims] And 1. A image blur blur prevention optical system movable in order to prevent, the vibration preventing optical system and the biasing means for biasing the optical axis direction, the first direction of the vibration preventing optical system Driving means for generating a movement amount of the first driving means, a second driving means for generating a movement amount of the shake prevention optical system in the second direction, and a movement amount of the first driving means for the shake prevention. First transmission means for transmitting to the optical system, second transmission means for transmitting the movement amount of the second driving means to the shake prevention optical system, and first transmission means in the first direction. A first transmitted member provided on the shake prevention optical system side in a state of receiving a movement amount and being relatively movable in the second direction with respect to the first transmitting unit; Means for receiving a movement amount in the second direction from the means, and Second transmission means provided on the shake prevention optical system side in a state of being relatively movable with respect to the second transmission means, and one of the first and second transmission means is provided. , provided with a guide means for restricting the freedom of non-movement in the predetermined direction, a guide means which gave freedom other than movement in the predetermined direction to the other transmission means, the guide means, the To the first transmission means in the second direction
A guide function that gives a degree of freedom or the second transmission means
At least a guide function that provides a degree of freedom in the first direction
Vibration preventing apparatus characterized by comprising one. 2. A image blur blur prevention optical system movable in order to prevent, and biasing means for biasing the vibration preventing optical system in the optical axis direction, to a predetermined direction of the vibration preventing optical system Drive means for generating a movement amount; transmission means for transmitting the movement amount of the drive means to the shake prevention optical system; and a movement amount in a predetermined direction from the transmission means, and a direction substantially perpendicular to the predetermined direction. And a transmitted means provided on the shake prevention optical system side so as to be relatively movable with respect to the transmitting means, and an adjustment capable of adjusting a mounting positional relationship with the transmitting means to the transmitted means. A shake prevention device characterized by being provided with means. 3. The shake prevention device according to claim 2, wherein the transmitted means is configured to receive the movement amount at two locations with respect to the transmission means, and the adjusting means adjusts the movement amount of the transmitted means. A shake prevention device, characterized in that at least one of two receiving positions is configured to be changeable along a moving direction. 4. A image blur blur prevention optical system movable in order to prevent, the vibration preventing optical system and the biasing means for biasing the optical axis direction, the first direction of the vibration preventing optical system Driving means for generating a movement amount of the first driving means, a second driving means for generating a movement amount of the shake prevention optical system in the second direction, and a movement amount of the first driving means for the shake prevention. First transmission means for transmitting to the optical system, second transmission means for transmitting the movement amount of the second driving means to the shake prevention optical system, and first transmission means in the first direction. A first transmitted member provided on the shake prevention optical system side in a state of receiving a movement amount and being relatively movable in the second direction with respect to the first transmitting unit; Means for receiving a movement amount in the second direction from the means, and Second transmission means provided on the shake prevention optical system side so as to be relatively movable with respect to the second transmission means, and one of the first and second transmission means is provided.
Guide that regulates the degree of freedom other than movement in a predetermined direction
Means is provided and the other transmission means has a degree of freedom other than movement in a predetermined direction.
A stiff guide means is provided, which guide means extends in a second direction to the first transmission means.
A guide function that gives a degree of freedom or the second transmission means
At least a guide function that provides a degree of freedom in the first direction
A shake prevention device comprising one of the above, and an adjusting means capable of adjusting a mounting positional relationship with the second transmitting means is attached only to the second transmitted means. 5. The shake prevention device according to claim 4, wherein the second transmitted means is configured to receive a movement amount in the second direction at two locations with respect to the second transmission means, and is adjusted. The shake preventing device is characterized in that at least one of the two means for receiving the movement amount of the second transmitted means is changeable along the second direction. 6. A image blur blur prevention optical system movable in order to prevent, the vibration preventing optical system and the biasing means for biasing the optical axis direction, the first direction of the vibration preventing optical system Driving means for generating a movement amount of the first driving means, a second driving means for generating a movement amount of the shake prevention optical system in the second direction, and a movement amount of the first driving means for the shake prevention. First transmission means for transmitting to the optical system, second transmission means for transmitting the movement amount of the second driving means to the shake prevention optical system, and first transmission means in the first direction. A first transmitted member provided on the shake prevention optical system side in a state of receiving a movement amount and being relatively movable in the second direction with respect to the first transmitting unit; Means for receiving a movement amount in the second direction from the means, and Second transmission means provided on the shake prevention optical system side so as to be relatively movable with respect to the second transmission means, and one of the first and second transmission means is provided.
Guide that regulates the degree of freedom other than movement in a predetermined direction
Means is provided and the other transmission means has a degree of freedom other than movement in a predetermined direction.
A stiff guide means is provided, which guide means extends in a second direction to the first transmission means.
A guide function that gives a degree of freedom or the second transmission means
At least a guide function that provides a degree of freedom in the first direction
One of the first transmitted means and the first transmitting means is configured to transmit the movement amount at a plurality of points, and the second transmitted means and the second transmitting means are The shake prevention device is characterized in that the movement amount is transmitted only in one place.