JP2535079B2 - Vibration device - Google Patents

Description

The present invention relates to a vibrating member, a contact member that comes into contact with the vibrating member and relatively moves due to vibration generated in the vibrating member, and a predetermined distance between the both members. The present invention relates to a vibrating device having a pressurizing member for applying the pressing force.

(Prior Art) In a vibration wave motor, a moving body is brought into pressure contact with a metallic elastic body, for example, formed in a ring shape, in which a progressive vibration wave is formed, and a traveling wave excited by the elastic body is generated. Generally, the moving body is driven by friction, and the pressure applied between the elastic body and the moving body affects the performance of the motor. Therefore, a pressure adjusting mechanism for applying a set pressure is provided. There is.

Conventionally, the force adjustment mechanism of a vibration wave motor normally uses an adjustment washer between a pressure member (disc spring) and a fixed member to keep the amount of deflection of the pressure member constant, thus achieving a set pressure value. I was adjusting. Further, as another pressurizing force adjusting mechanism, the amount of deflection of the pressurizing member is made constant by tightening the nut or the like to adjust to a set pressurizing force value.

[Problems to be Solved by the Invention]

However, in the above-mentioned conventional pressing force adjusting mechanism,
In the case of the former method using the adjustment washer, it is very troublesome to incorporate the adjustment washer, and this adjustment is supposed to be adjusted to the set pressure value by making the deflection amount of the pressure member constant. Since the individual spring characteristic values of the pressing member have variations, it is difficult to adjust the set pressing force value only by setting the deflection amount. In order to solve this problem, the spring characteristic of each pressure member is measured, the amount of deflection is determined by looking at the characteristic value, and the pressure is adjusted using the adjustment washer. However, measuring the spring characteristics of each pressure member is poor in mass productivity, and it is very troublesome to make adjustments, and there is a drawback in that adjustment time is considerably consumed.

Also, in the case of the latter method based on the tightening condition of the above-mentioned nuts and the like, it is a method of making the amount of deflection of the pressure member constant depending on the degree of tightening of the nuts, etc. The method described above does not change, and the problems described above occur. In order to solve this problem, it is conceivable to convert the pressing force of the pressing member into the tightening torque of the nut and adjust it to the set pressing force value.However, in this method, the friction generated when rotating the nut Since the adjustment needs to be performed in consideration of the torque, an error due to the variation of the friction torque is added, and it is considerably difficult to adjust the set pressure value.

An object of the present invention is to solve the above-mentioned conventional problems and to provide a vibrating device capable of setting a pressing force to a set value without variation.

[Means for solving the problem]

In order to achieve the above object, the vibration device according to the present invention comprises:
A vibrating device comprising: a vibrating member; a contact member that is in contact with the vibrating member and relatively moves due to vibration generated in the vibrating member; and a pressure member that applies a predetermined pressure force between the both members. A holding member for holding the pressure member in a pressed state,
In order to position the holding member so that the holding member can be pressed and adjusted, the holding member is provided with a plurality of locking positions when the holding member is moved in the pressing direction and then in a direction substantially orthogonal to the pressing direction. It is characterized in that a bayonet mechanism for locking the holding member by a portion is provided.

[Action]

The vibrating device having the above-described configuration can be a method of managing the applied pressure itself instead of the method of managing the applied pressure by the deflection amount of the conventional pressurizing member. The pressing force can be adjusted to a set value by adding a weight to bend the pressing member and then bringing the holding member into contact with the pressing force holding engagement surface.

〔Example〕

FIG. 1 is a longitudinal sectional view of an essential part showing an embodiment of a lens barrel which can effectively carry out the present invention, and FIG. 2 is a vibration wave motor detachably incorporated in the lens barrel of FIG. It is a longitudinal cross-sectional view of a driving force generation unit.

1 and 2, 1 is a fixed cylinder having an inward flange 1a, 2 is an outer cylinder having an inward flange 2a, 3
Is fastened with a screw 4 to an inward flange 7a of a tubular body 7 which will be described later, while a cam barrel 5 having a cam groove 3a formed in a cylindrical portion, a lens holder 5 fitted in an inner diameter portion of the cam barrel 3, 6 is a cam screw fitted into the cam groove 3a of the cam barrel 3 and fixed on the lens holder 5, and L is the lens holder 5
It is a lens fixed to. Reference numeral 7 denotes a tubular body which is a frame or a base plate of a driving force generating unit A described later, and an inward flange 2a of the outer tube 2 is fastened by an outward flange 7b of the tubular body 7 and a screw 8. The driving force generating unit is configured in this state (see FIG. 2). Further, the inward flange 1a of the fixed barrel 1 is fastened to the inward flange 7a of the tubular body 7 with a screw 9 to fix the fixed barrel 1. Reference numeral 10 denotes a manual operation ring which is formed on the outer peripheral surface of the fixed barrel 1 and is fitted in the circumferential groove and the outer periphery of a manual collar 25 described later and can be fixed about the central axis Z (that is, the optical axis) of the lens L. is there.

As shown in FIG. 2, on the outer peripheral surface of the tubular body 7, all the components of the vibration wave motor B, the motor bearing and output member C that comes into contact with the rotor portion of the vibration wave motor B, etc. are mounted. Has been done.

The components of the vibration wave motor B and the structure of the motor bearing / output member C will be described below.

The vibration wave motor B includes an annular vibration member 11 having a trapezoidal cross section, an electrostrictive element 12 physically bonded to one end surface of the vibration member 11, and a felt pressed against the surface of the electrostrictive element 12. A ring-shaped vibration absorber 13 composed of, etc., a ring-shaped additional spring 14 that pushes the vibration absorber 13 toward the vibrating member 11, and a ring-shaped ring that holds the pressing force of the disc spring 14 between the cylindrical body 7. Holding member 15,
An annular circumferential moving member that is the rotor of the vibration wave motor B
16, a rotary cylinder 1 which is rotatable integrally with the circumferential moving member 16
7. A rubber which is sandwiched between the rotary cylinder 17 and the circumferential moving member 16 so as not to transmit the axial movement (that is, chatter vibration) of the circumferential moving member 16 to the rotary barrel 17. A ring 18 is provided in the tubular body 7, and is a groove of the vibrating member 11.
It is composed of various members such as a vibrating member anti-rotation projection 7c which is inserted into 11a and prevents the vibrating member 11 itself from rotating.

In this vibration wave motor B, the circumferential moving member 16 and the rotary cylinder 17 and the rubber ring 18, which are configured to be integrally rotatable by the circumferential traveling wave vibration generated in the vibrating member 11, center around the optical axis Z. It has a rotating structure.

The motor shaft / output member C disposed adjacent to the end surface of the rotary cylinder 17 of the vibration wave motor B is disposed on the outer peripheral surface of the cylindrical body 7 as shown in FIGS. 2 and 3. A rotatably fitted ring 19 and the ring 19 at least at three points on the circumference of the ring 19 on a radial axis orthogonal to the axis Z of the ring 19 (the axis of the vibration wave motor, that is, the optical axis). A roller support shaft 19a provided so as to project from the outer peripheral surface of the
A roller 2 rotatably fitted to the roller support shaft 19a.
0 and a washer 21 that supports the roller 20 so as not to come off the roller support shaft 19a.

The ring 19 also serves as an output member of the driving force generation unit A, and is an L for rotating the lens holder 5.
A lens holder drive member 22 of the shape is fastened to the end surface of the ring by a screw 23. The lens holder drive member 22 is provided with a notch 22a, and the notch 22a
Since the cam screw 6 is fitted in the lens holder 5, the lens holder driving member 22 can be operated to rotate the lens holder 5. The outer peripheral surface 17a of the rotary cylinder 17 is engaged with the end surface of the roller 20 to prevent the rotary shaft of the rotary cylinder 17 from rattling in the radial direction. Further, on the outer peripheral surface of the roller 20, the end surface of the rotary cylinder 17 and the end surface of the manual operation force input ring 24 for inputting the rotational torque of the manual operation ring 10 are in contact with each other.
The mutual contact pressure between the outer peripheral surface of the roller 20, the end surface of the rotary cylinder 17, and the end surface of the manual operation force input ring 24 is determined by the pressing force of the disc spring 14 which is a component of the vibration wave motor B.

Reference numeral 25 is an annular manual collar that is a frictional force stabilizing member fixed to the cylindrical body 7. The manual color 25
Since the manual operation ring 10 is rotatably fitted to the above, the structure has a good manual operation feeling.
On the other hand, the manual operation force input ring 24 contacts the outer peripheral surface of the roller 20 at one end surface (the end surface on the right side in FIGS. 1 and 2), and contacts the end surface of the manual collar 25 at the other end surface. There is. Further, the outer peripheral edge portion of the manual operation force input ring 24 is engaged with the concave portion of the inner peripheral surface of the manual operation ring 10, and the manual operation force input ring 24 is adapted to be rotated by the manual operation ring 10. There is. The manual operation force input ring 24 can rotate only when a driving torque larger than frictional resistance with the manual collar 25 is transmitted from the manual operation ring 10, and does not rotate otherwise. Therefore, unless the user of the lens barrel operates the manual operation ring 10 with the rotational torque that overcomes the frictional resistance between the manual operation force input ring 24 and the manual collar 25, the manual operation force input ring 24 rotates. do not do.

A pulse plate holder 26 is sandwiched between the cylindrical body 7 and the outer cylinder 2 and rotatable about the optical axis Z. A pulse plate 27, which will be described later, is fixed to the left end, and a pulse plate holder 27 is fixed to the right end. Protrusion 26
Since the protrusion 26a has a and is engaged with the groove 19b of the ring 19 through the hole of the cylindrical body 7, the protrusion 26a can rotate integrally with the ring 19. 27 is a pulse plate having a large number of slits formed therein. 28 is a photoelectric transmission type for detecting rotation of the pulse plate 27 about the optical axis Z at the slit portion of the pulse plate 27 and sending a signal to a control circuit (not shown) to control and drive the vibration wave motor B. switch. 29
Is a switch holding plate to which the photoelectric transmissive switch 28 is fixed, and is fixed to the cylindrical body 7 by a known method.
Reference numeral 30 denotes a contact brush fixed to the ring 19, which slides on the flexible printed board 31 provided on the outer periphery of the tubular body 7 by the rotation of the ring 19. The role of the contact piece brush 30 is to transmit information about the distance between ∞ and the closest distance in focus and information at the ∞ end and the closest distance to a circuit (not shown).

 Next, the operation of the above structure will be described.

When the lens barrel user wants to drive the lens holder 5 with the force of a finger, the manual operation ring 10 is moved to the optical axis Z.
Rotate with your finger around. Then, the manual operation force input ring 4 overcomes the frictional resistance with the manual collar 25 and is rotated about the optical axis Z. At this time, however, since the vibration wave motor B is not driven, the rotation of the vibration wave motor B is performed. The cylinder 17 is stationary due to the frictional force between the vibrating member 11 and the circumferentially moving member 16, so that the roller 20 rolls along the end surface of the rotary cylinder 17 while being rotated by the manual operation force input ring 24. As a result, the ring 19 is rotated about the optical axis Z via the roller support shaft 19a, and the lens holder 5 is moved to the lens holder driving member 22.
While being rotated by the engagement of the cam screw 6 with the cam screw 6, the manual focusing is performed by axially moving along the cam groove 3a of the cam barrel 3.

On the other hand, when the lens barrel user wants to drive the lens holder 5 by the force of the vibration wave motor B, a walking switch (not shown) is operated. Then, a voltage is applied to the electrostrictive element 12 by the operation of a control circuit (not shown), and as a result, vibration that proceeds in the circumferential direction is generated in the vibrating member 11,
The vibration of the vibrating member 11 causes the circumferential moving member 16, the rubber ring 18, and the rotary cylinder 17 to rotate about the optical axis Z. Due to this rotation, the roller 20 receives a rotation torque from the rotary cylinder 17, but at this time, since the manual operation ring 10 is not rotated, the manual operation force input ring 24
Since the roller 20 does not rotate, the roller 20 has the roller support shaft 19
While rotating around a, it rolls along the end face of the manual operation force input ring 24, and the ring 19 is rotated about the optical axis Z via the roller support shaft 19a. Therefore, the lens holder 5 has the lens holder driving member 22.
While being rotated by the engagement of the cam screw 6 with the cam screw 6, the auto-focusing is performed by axially moving along the cam groove 3a of the cam barrel 3.

By the way, although a vibration wave motor is used as a drive source for autofocusing, one condition for stabilizing the motor performance of this vibration wave motor is that the pressing force value of the disc spring 14 must be stabilized. In this embodiment, the pressing force of the disc spring 14 is adjusted as follows.
This state is shown in FIGS. 4 and 5. Reference numerals are the same as those in FIGS. 1 to 3.

The cylindrical body 7 is provided with grooves (bayonet grooves) formed by the taper cam groove 7c and the straight groove 7d in three equal parts. The holding member 15 is provided with three protrusions 15a corresponding to the three grooves. Further, the holding member 15 is provided with three holes 15b which engage with three pins provided on a weight (not shown).

An example of the method for adjusting the pressing force in this structure will be described.

First, with the vibrating member 11, electrostrictive element 12, vibration absorber 13 and the like of the vibration wave motor incorporated in the tubular body 7, the disc spring 14 is inserted into the tubular body 7 and placed on the vibration absorber 13. . Then, the projections 15a at three positions of the holding member 15 are inserted from the above in alignment with the straight grooves 7d of the tubular body 7. In that state,
A weight (not shown) corresponding to the set pressurizing force value is placed on the holding member 15 with the three pins of the weight and the three holes 15b of the holding member 15 aligned. If this state is kept, it means that the set pressure value has been adjusted. That is, as a holding method, the holding member 15 on which a weight is mounted is rotated clockwise.
Rotate until the taper cam groove 7c of the cylindrical body 7 comes into contact with any point of the taper cam portion (see FIG. 5).
By adhering the projection 15a of the holding member 15 to the tapered cam groove 7c in this state, the pressing force can be held even if the weight is removed. With this method, the pressure adjustment does not take time, and the pressure values do not vary individually. The reason why the weight is provided with three pins and engaged with the hole 15b of the holding member 15 is that the taper cam groove 7c of the cylindrical body 7 is held until it comes into contact with any point of the taper cam part. This is because when the member 15 is rotated, the holding member 15 can be rotated by the engagement of the pin even if the weight itself is rotated.

As another structure, the weight according to the present invention can be used even if the weight is not directly placed on the holding member 15 and the weight is directly placed on the disc spring 14 to rotate the holding member 15.
It goes without saying that the present invention is established.

As described above, the pressurization adjustment of the vibration wave motor is very simple. However, as a method for holding the pressurization, the taper cam portion of the taper cam groove 7c and the holding member 15 are finally obtained. Although it has been described that the protrusion 15a is held by being adhered, a method of mechanically holding the protrusion 15a without adhering is shown in FIG. 6 and FIG. Reference numerals are the same as those in FIGS. 1 to 5. The assembling method is the same as that described with reference to FIG. 4 is different from that shown in FIG. 4 in that the holding member 15 is provided with a ratchet pawl 15c on the projection 15a, and the ratchet groove 7e is provided in the tapered cam groove 7c of the tubular body 7 which engages with the ratchet pawl 15c. That is the point. With this structure, the position of the holding member 15a is not displaced in the optical axis direction by the pressing force of the disc spring 14 but is held by ratchet coupling (see FIG. 7), and the pressing force can be kept. . still,
Although there are five ratchets in FIG. 7, it is a matter of course that further fine adjustment is possible by increasing the number of ratchets.

〔The invention's effect〕

As described above, according to the present invention, the vibrating member,
In a vibrating device having a contact member that comes into contact with the vibrating member and relatively moves due to the vibration generated in the outer vibrating member, and a pressure member that applies a predetermined pressing force between the both members, the pressure member is pressed. A holding member that holds the holding member in a state, and in order to position the holding member such that the holding member can be press-adjusted, a plurality of holding members are moved when the holding member is moved in the pressing direction and then in a direction substantially orthogonal to the pressing direction. Since the bayonet mechanism for locking the holding member by the locking portion having the locking position is provided, the following method can be used as the pressing force adjusting method. That is,
By applying a pressurizing force of a set value of the vibrating member and the contact member to the pressing member, and in that state by moving the holding member in a direction substantially orthogonal to the pressing direction and fixing the holding member at the locked position, It is a method that can be held by the applied pressure of the set value.

This method is not a conventional method of controlling the applied pressure by the amount of deflection of the pressing member, but a method of managing the applied pressure itself. Therefore, there is almost no variation in the pressing force, and the pressing force adjustment time is significantly shortened with a simple structure.
Furthermore, since adjustment washers are not necessary, it is advantageous in terms of space and cost, and its effect is enormous.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a lens barrel having a pressure mechanism according to an embodiment of the present invention, and FIG. 2 is a vertical cross-sectional view of a driving force generating unit A having the pressure mechanism. Is a front view of the motor bearing / output member C, FIG. 4 is a perspective view showing an embodiment of a pressurizing mechanism, FIG. 5 is a partial view of the pressurizing mechanism in FIG. 4, and FIG. A perspective view showing a pressing mechanism of the embodiment,
FIG. 7 is a partial view of the pressing mechanism in FIG. 7 ... Cylindrical body (fixed support member) 7c ... Tapered cam groove, 7d ... Straight groove 11 ... Vibration member, 12 ... Electrostrictive element 13 ... Drive absorber 14 ... Disc spring (pressurizing member) ) 15 …… Holding member, 15a …… Protrusion 16 …… Circular direction moving member, 17 …… Rotating cylinder 18 …… Rubber ring, 19 …… Ring 20 …… Roller 24 …… Manual operation force input ring 25 …… Manual Color

Claims (1)

(57) [Claims] 1. A vibration having a vibrating member, a contact member that comes into contact with the vibrating member and relatively moves due to vibration generated in the vibrating member, and a pressure member that applies a predetermined pressing force between the both members. In the apparatus, a holding member that holds the pressing member in a pressed state, and a direction that is substantially orthogonal to the pressing direction after moving the holding member in the pressing direction in order to position the holding member so that the pressing member can be pressed and adjusted. A vibrating device comprising a bayonet mechanism that locks the holding member by a locking portion having a plurality of locking positions when the vibrating device is moved to.