JPH08251949A - Oscillation driver - Google Patents

Abstract

PURPOSE: To reduce the size of a lens driver while enhancing the performance and stabilizing the quality. CONSTITUTION: A moving member comprises a piezoelectric oscillator 2 for exciting an oscillation wave in longitudinal and lateral coupling mode, a frictional drive means for extraction driving the oscillation wave, and a sliding member having one end disposed oppositely to the frictional drive means and the other end coupled with the piezoelectric oscillator 2. The oscillation driver comprises a guide member 1 being driven frictionally utilizing the oscillation wave of the frictional drive means while being held between the frictional drive means and the sliding member. The guide member 1 comprises an external power supply means and an electrical loop is formed between the external power supply means and the piezoelectric oscillator 2 through contact between the guide member 1 and the sliding member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in, for example, a video camera, and more particularly to a vibration driving device for moving a variable power lens group, a focus lens group and the like in a lens barrel.

[0002]

2. Description of the Related Art As a lens driving device, for example, a bimorph type piezoelectric vibrator in which two piezoelectric ceramics are bonded together, a supporting member with a slide mechanism for supporting the piezoelectric vibrator, and a piezoelectric vibrator are attached. A plate-shaped pressing member for pressing the friction member against the guide bar that guides the movement of the lens frame, a magnetic sensitive element arranged in the vicinity of the guide bar magnetized in a predetermined pattern, and the above members A flexible printed circuit board with a U-turn shape that integrates the sleeve member and the stop member having a lens frame for housing the terminals of the piezoelectric vibrator and the magnetic sensitive element to make the movement of the lens frame smooth. Made of.

[0003]

However, in the above-mentioned conventional example, the flexible printed circuit board is attached to the sleeve portion of the movable lens holding member and has a U-turn shape so as not to hinder the movement of the movable lens holding member. , There were the following problems.

A space for making a U-turn of the flexible printed circuit board is required, and the lens driving device becomes large.

The flexible printed circuit board is considered as a kind of elastic member and becomes a load when the movable lens holding member is driven, and the load fluctuates depending on the position of the movable lens holding member, which adversely affects the control.

When the movable lens holding member is moved, a load is applied to the terminals of the piezoelectric vibrator and the magnetic sensitive element, and there is a risk that the terminals will be damaged by repeated movement.

An object of the first invention according to the present application is to provide a vibration driving device capable of miniaturizing a lens driving device and the like.

A second object of the present invention is to provide a vibration driving device capable of improving the performance of a lens driving device or the like.

A third object of the present invention is to provide a vibration driving device capable of stabilizing the quality of a lens driving device or the like.

[0010]

A first structure for realizing the first object of the invention according to the present application is, as described in claim 1, to excite a vibration wave by applying a frequency voltage from the outside. An electromechanical energy conversion element, a friction drive section attached to the main surface of the electromechanical energy conversion element to extract and drive the vibration wave, and one end of the friction drive section is opposed to the friction drive section and the other end is the electric machine. By a friction member using the vibration wave of the friction drive unit while being sandwiched between a moving member including a sliding member connected to an electrode of a mechanical energy conversion element and the friction drive unit and the sliding member. A vibration driving device having a guide member that is driven relatively in one direction, wherein the guide member has an external power feeding means, and the external power feeding is performed through electrical contact between the guide member and the sliding member. Means and the electromechanical device In the vibration driving apparatus is characterized in that electrically connect the Energy conversion element.

According to this structure, since it is not necessary to mount the flexible printed circuit board on the movable lens holding member of the lens driving device, for example, a space for making a U-turn of the flexible printed circuit board is not required, and the entire lens driving device is downsized. be able to. Further, unlike the conventional case, the flexible printed circuit board does not become a load when the movable lens holding member or the like is moved, so that a lens driving device which is easy to drive and is excellent in control can be obtained. Further, since there is no risk that a terminal portion such as a piezoelectric vibrating element or a magnetically sensitive element housed in the movable lens holding member is overloaded or damaged, maintenance problems can be solved.

According to a second aspect of the present invention, there is provided a structure according to the second aspect, wherein the sliding member is added so as to press the guide member toward the friction drive portion. It is characterized in that it is also used as a pressure means.

According to this structure, it is possible to efficiently obtain the pressure contact frictional force to the friction drive portion of the guide member, and obtain the proper propulsion force of the moving member.

The structure for realizing the third object of the invention according to the present application is, as described in claim 3, in claim 1 or 2, wherein the guide member has an electrode portion contacting the sliding member. And a ground connection portion that is in contact with the electromechanical energy conversion element side.

According to this structure, an effective elliptic motion is generated in the friction drive portion due to the excitation phenomenon of the electromechanical energy conversion element, for example, the piezoelectric vibrator due to the frequency voltage having the phase difference of 90 °, and for example, the movement. The movable lens holding member can be smoothly moved in one direction through the member,
Further, if the condition of energizing the piezoelectric vibrator, that is, the sign of the applied voltage is reversed, the movable lens holding member can be easily moved in the other direction. According to the fourth aspect, the configuration for achieving the second object of the invention according to the present application is as follows.
In 2 and 3, the guide member is a rod-shaped body having an arc surface in cross section, and has at least a flat surface portion that is in contact with the friction drive portion.

According to this structure, the thrust of the moving member along the guide member can be effectively obtained by ensuring the contact area of the guide member with the friction drive portion, and the surface regulation by the flat surface portion can be achieved. Therefore, it is possible to prevent the generation of the twisting torque around the center axis of the guide member.

According to a fifth aspect of the present invention, the electrode portion of the guide member is formed along the moving direction. It is characterized by

According to this structure, the load on the guide member of the moving member is reduced, and, for example, fluctuation due to the position of the movable lens holding member directly connected to the moving member is eliminated, and good movement drive for control can be obtained.

According to the sixth aspect of the present invention, the second configuration for achieving the first object of the invention of the present application,
In 3, 4, and 5, the moving member has a support made of an insulator that supports the electromechanical energy conversion element, and both sides of the support contact electrodes of the electromechanical energy conversion element. The vibration driving device is characterized in that it has a conductor, and each electrode of the electromechanical energy conversion element is electrically contacted with the sliding member through the conductor.

According to this structure, it is possible to supply power to, for example, the piezoelectric vibrator that constitutes the electromechanical energy conversion element through the support, the lead wiring to the piezoelectric vibrator can be eliminated, and the workability is improved.

[0021] According to another aspect of the present invention, the second object of the invention according to the present application is described.
In 3, 4, 5, and 6, the electromechanical energy conversion element is configured such that an upper piezoelectric vibrator and a lower piezoelectric vibrator are bonded to each other via a conductive thin film layer, and the friction drive unit is configured to include the upper piezoelectric vibrator. A rectangular hole formed in the vibrator, and a rectangular conductive friction member which is inserted into the rectangular hole without contact and is welded to the conductive thin film layer on the lower side and has a height higher than the height of the rectangular hole. And having.

According to this structure, the conductive thin film layer can be directly connected to the ground by using the friction drive unit, and the friction load and the generation of the friction noise when the moving member moves can be eliminated. For example, it is possible to reduce the frictional load on the guide member that slides the movable lens holding member of the lens driving device, and to provide a lens driving device that is easy to drive.

[0023] Another structure for realizing the third object of the invention according to the present application is, according to claim 8, claims 1, 2,
In 3, 4, 5, and 7, the sliding member is directly connected to the lower electrode of the electromechanical energy conversion element supported by the moving member to form a power feeding system.

According to this structure, it is not necessary to form the support by the conductor and the insulator, and the support can be manufactured very easily.

Another structure for achieving the object of the first invention according to the present application is, as described in claim 9, an electromechanical energy conversion element for exciting a vibration wave by applying a frequency voltage from the outside, A friction drive unit attached to the main surface of the electromechanical energy conversion element for extracting and driving a vibration wave;
In a vibration drive device having a conductive elastic member drawn out from the electrode of the electromechanical energy conversion element, and a conductive rail member attached to a fixing member near the electromechanical energy conversion element, The rail member has external power feeding means, and the external power feeding means and the electromechanical energy conversion element are electrically connected to each other through electrical contact between the rail member and the elastic member. .

With this structure, power can be supplied through the rail member.

[0027]

【Example】

(First Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with a lens driving device as an example.

First, the component structure of the lens driving device of the present invention will be described.

FIG. 1 is a view best showing the features of the present invention. In FIG. 1, 1 is a guide bar for guiding the moving direction of the movable lens holding member, and as shown in FIG. The insulating layer 12 and the two conductive layers 13 and 14 are uniformly attached to the predetermined positions on the surface with a thickness of about several μm. Reference numeral 2 is a piezoelectric vibrator, and two piezoelectric element plates 2a and 2a
With a thin metal plate 2c such as phosphor bronze sandwiched between b,
The two piezoelectric element plates 2a and 2b are divided into electrode regions at the central portions of the main surfaces, and have a total of four electrode portions. As shown in FIG. 11, the four electrode portions are electrodes A and D,
The electrodes C and B are connected by a lead wire or the like. Also,
At the center of the thin metal plate 2c (near the node of the piezoelectric vibrator),
It has clamping pieces 2c-1 and 2c-2 having elastic parts.

Friction materials 3a and 3b are attached to a mass point which makes an elliptical motion by energizing the piezoelectric vibrator 2 by adhesion or the like.

Reference numeral 4 denotes a support, which is adhered to a mass point (node) in a non-vibrating state when the piezoelectric vibrator 2 is energized, and 9a and 9b in FIG.
Are soldered to the positions indicated by and are attached to the electrodes C and D so as to be electrically connected to each other. The support 4 is constructed by sandwiching an insulator 4c between two conductors 4a and 4b.

Reference numerals 5a and 5b are pressure springs, and a perspective view of the pressure spring 5a is shown in FIG. The pressure springs 5a are all made of a conductive material, support the shaft portion of the roller 6 described later, and have elastic pieces 5a-1 having ring-shaped hooking pieces 5a-1 and 5a-2 that allow the roller 6 to rotate. Have three. Further, it has a hole 5a-8 for fitting with a protrusion 7a-1 of the case 7 described later and for positioning the pressure spring 5a. Further, holes 5a-4, 5a for engaging with the protrusion 7a-2 of the case 7
It has -5. Further, it has elastic pieces 5a-6 for contacting the support 4. In addition, guide bar 1
It has a hole 5a-7 for inserting the.

In FIG. 3, only one of the pressure springs 5a and 5b is shown, and the other pressure spring 5b has the same shape as one pressure spring and performs the same function. Therefore, only one pressure spring 5a will be described, and description of the other pressure spring 5b will be omitted.

Reference numerals 6a and 6b denote rollers, and roller pieces 6a-1 and 6b-1 made of an insulator and roller pieces 6a-2 and 6b-2 made of a conductor as shown in FIG. 5 (a). Consisting of roller shafts 6a-3, 6b-3 made of a conductor,
The roller shaft 6a-is provided in the hole provided in each roller piece.
3, 6b-3 are inserted by press fitting or the like (Fig. 5).
(B)). Reference numeral 7 denotes a case, which is made of an insulating material such as synthetic resin, and which fixes the protrusions 7a-1 and 7b-1 for fitting into the holes of the pressure springs 5a and 5b and the pressure springs 5a and 5b. It has projections 7a-2 and 7b-2 for holding it and a groove 7c for fixing and holding the support 4. Reference numeral 8 denotes a cap, which is made of an insulating material such as synthetic resin, and is provided with holding pieces 8a and 8b having locking claws as shown in FIG.

Next, the mutual relation of each component will be described.

Shaft portions 6a-3, 6b- of the rollers 6a, 6b
Both ends of 3 are hooking pieces 5 provided on the pressing springs 5a and 5b.
The rollers 6a and 6b hooked on a-1, 5a-2, 5b-1 and 5b-2 become rotatable about their axes. At that time, the rollers 6a, 6b are insulated roller pieces 6a-1, 6b.
b-1 tapered nipping surface and conductive roller piece 6a-2,
The tapered holding surfaces 6b-2 are attached so as to face each other in the opposite directions when viewed in the axial direction of the guide bar 1. Pressure spring 5 with rollers 6a and 6b attached
First, a and 5b are protrusions 7a-2 provided on the case 7,
7b-2. This is shown in FIG. The protrusion 5b-4 provided on the pressure spring 5b is the protrusion 7b.
-2, the pressure spring 5b reaches the bottom surface of the case 7 by inserting the protrusion 7b-2. Next, the pressure spring 5b is slid (right in FIG. 4). At that time, the protrusion 7b-2 has an elastic holding piece as shown in FIG. 4B, and a diameter slightly larger than the diameter of the hole 5b-5 of the pressure spring 5b on the bottom surface side of the tip of the holding piece. Since it has a hemispherical protrusion 7b-3, when the pressure spring 5b is slid, the holding piece of the protrusion 7b-2 bends upward, and when it is further slid, the protrusion 7b-3 is added. The pressure spring 5b falls into the hole 5b-5, the flexure is released with a slight holding force, and the pressure spring 5b is fixed. Further, the protrusion 7b provided on the case 7 during the slide
1 and the hole provided in the pressure spring 5b (the same hole as in FIGS. 3 and 5a-8) are fitted to position the pressure spring 5b. Since the attachment of the pressure spring 5a is similar to the above description, it is omitted.

Next, the support body 4 attached to the piezoelectric vibrator 2 is fixed to the groove portion 7c provided in the case 7 by press fitting or the like. At that time, as shown in FIGS. 6 and 7, the elastic pieces 5a-6 and 5b-6 provided on the pressure springs 5a and 5b are
When the support body 4 is attached, the support body 4 bends, and when the support body 4 is completely attached to the case 7, the elastic pieces 5a-6 and 5b-6 hold a force in the direction of sandwiching the support body 4, so that the elastic piece 5a-
6, 5b-6 and the conductors 4a, 4b of the support 4 are completely in contact with each other. The cap 8 is attached by a snap fit to the case 7 to which the above components are attached. FIG. 8 shows a state in which the above attachment is completed.

Next, the unit 25 obtained as described above has a movable lens holding member 21 as shown in FIG.
It is mounted in the hole portion 21a-1 provided in the sleeve portion 21a. At that time, projections 21a-2, 21a are formed on both end surfaces of the hole 21a-1 in a direction perpendicular to the axial direction of the guide bar 1.
-3 is provided, and the unit 25 has grooves 7d-1 and 7d.
Since -2, 8c-1 and 8c-2 (8c-2 is not shown) are provided, the protrusion 21a-2 and the grooves 7d-1 and 8c are provided.
-1, the protrusion 21a-3 and the grooves 7d-2, 8c-2 are engaged with each other, and the unit 25 is slid in the direction perpendicular to the axial direction of the guide bar 1 to be mounted.

The guide bar 1 is inserted into the guide hole portion 21b provided in the movable lens holding member 21, and then inserted into the hole portions 25a and 25b provided in the unit 25 slid on the sleeve portion 21a, and finally. Sleeve part 2
It is pulled out through a hole 21c provided in 1a. At that time, in the unit 25, as shown in FIG. 10, the tapered portions of the rollers 6a and 6b and the conductive layers 13 and 14 of the guide bar 1 are in contact with each other. In addition, the rollers 6a, 6
When the guide bar 1 is inserted, the pressure springs 5a and 5b to which b is attached are bent upward, so that the contact pressure between the rollers 6a and 6b and the guide bar 1 and between the friction members 3a and 3b and the guide bar 1 is reduced. Can be supplied.

Further, the elastic pieces 2c-1 and 2c-2 from the central portion (node portion) of the thin metal plate 2c bend laterally when the guide bar 1 is inserted, and supply a contact pressure with the guide bar 1. Like The elastic pieces 2c-1 and 2c-2 are in contact with the conductor 11 of the guide bar 1.

Next, the flow of power supply will be described.

The conductive layer 13 of the guide bar 1 is not electrically connected to the insulating roller piece 6a-1 and is a conductive roller piece 6a.
-2 is in a conductive state. Since the roller shaft is made of a conductor and the roller shaft 6a-3 is attached to the pressure spring 5a which is also made of a conductor, the roller piece 6a-2 and the pressure spring 5a are in a conductive state. is there. Since the pressure spring 5a is in contact with the support 4a as described above, it is in a conductive state with the support 4a.

As shown in FIG. 11, the support 4a is in contact with the electrode C and is connected from the electrode C to the electrode B by a lead wire or the like. Therefore, the electrode B and the electrode C are connected to each other by the support 4a.
It is in a conductive state with a.

Similarly, the conductive layer 14 of the guide bar 1 is in conduction with the roller piece 6b-2, the roller shaft 6b-3, the pressing spring 5b, the support 4 and the electrodes A and D.

The elastic piece 2c-1 or 2c-2 extends from the center of the piezoelectric vibrator 2 to the conductor 11 of the guide bar 1.
And the guide bar 1 is connected to the ground.

Now, the conductive layer 13 and the conductor 1 of the guide bar 1
During one period, V ₁₃ = v ₁₃ cosωt (where v _{13 is the} voltage amplitude, t:
When an alternating voltage of time, ω: angular frequency) is applied, vibration displacement 101 is excited in the x direction and applied in the y direction in the friction material 3a or 3b as shown in FIGS. 21 (a) and 21 (b). The vibration displacement 103 is excited. However, the phases of the vibration displacements of the friction materials 3a and 3b are shifted by about 180 degrees.

Next, between the conductive layer 14 and the conductor 11 of the guide bar 1, V ₁₄ = v ₁₄ sinωt (where v _{14 is the} voltage amplitude, t:
When an AC voltage of time, ω: angular frequency) is applied, the vibration displacement 102 is excited in the x direction and is applied in the y direction in the friction material 3a or 3b as shown in FIGS. 21 (a) and 21 (b). The vibration displacement 104 is excited. However, the phases of the vibration displacements of the friction materials 3a and 3b are shifted by about 180 degrees.

Next, V ₁₃ = v ₁₃ cosωt is simultaneously applied between the conductive layer 13 and the conductor 11 of the guide bar 1, and V ₁₄ = v ₁₄ sin ωt is simultaneously applied between the conductive layer 14 and the conductor 11 of the guide bar 1. Then, as shown in FIGS. 21 (a) and 21 (b), the friction material 3a or 3b has a vibration displacement 10 in the x direction.
5 is excited, and the vibration displacement 106 is excited in the y direction. However, the phase of the vibration displacement of the friction materials 3a and 3b is approximately 18
It is 0 degrees off.

When these vibration displacements 105 and 106 are combined over time, the result is as shown in FIG.
a and 3b will describe an elliptic motion. Note that the elliptical locus in the CCW direction is shown in FIG.

Since the friction members 3a, 3b and the guide bar 1 are pressed by the pressure springs 5a, 5b, when the friction members 3a, 3b make an elliptic motion as described above, a thrust is generated and the lens holding member. 21 can be driven in one direction along the guide bar 1.

When moving in the other direction, the phases of V ₁₃ and V ₁₄ may be reversed. For example, V ₁₃ = v ₁₃ s
By applying an AC voltage of inωt, V ₁₄ = v ₁₄ cosωt to the conductive layers 13 and 14, respectively, driving in the other direction becomes possible.

FIGS. 12A and 12B are enlarged perspective views of the terminal member for supplying power to the guide bar 1.

Reference numeral 31 is a terminal case made of an insulating material such as synthetic resin, and 32, 33, 34 are terminals made of a conductive material. Holes 31c, 31d, 3 of the terminal case 31
The terminals 32, 33, and 34 are inserted through 1e, and the projecting pieces 31a and 31b provided on the terminal case 31 are connected to the terminal 3
2, 33 are fitted in the holes provided in the protrusions 31a, 31
The terminals 32, 33, and 34 are fixed to b by heat welding or the like. In addition, the terminals 32, 33, and 34 have projections 32a and 33, respectively.
a is formed, and when the terminal case 31 is inserted into the guide bar 1, the guide bar 1 is attached to the protrusions 32a and 33a.
The conductive layers 13 and 14 are in contact with each other, and the protrusion 34a is in contact with the conductor 11, and power supply is possible by connecting to the respective terminals.

Further, FIG. 13 shows a state in which the guide bar 1 with the terminal case 31 is attached to the lens barrel 41. A hole 41a is opened in the lens barrel 41 so that the terminals 32, 33 and 34 can be projected outward from the hole 41a, and power can be easily supplied by an external flexible printed circuit board or the like. .

Next, the position detecting means of the movable lens holding member 21 will be described. In FIG. 9, a long groove is provided in the axial direction of the guide bar 1 on the upper surface of the sleeve portion 21a of the movable lens holding member 21, and the long groove is attached to a rectangular plate-shaped magnetic material with a predetermined pitch. The magnetized plate member 22 is fitted and fixed by adhesion or the like.

Further, the lens barrel 41 is provided with an elastic holding piece 41b and a groove portion 41c, and the groove portion 41 is formed.
The magnetically sensitive element 43 is housed in c and held by the holding piece 41b. The magnetically sensitive element 43 is arranged so as to face the plate member 22 at a constant interval, and the movable lens holding member 2 is provided.
When 1 moves, the magnetic field on the magnetic sensitive element 43 changes, so that the position can be detected.

As described above, according to the present invention, the space for making a U-turn of the flexible printed circuit board is not required, and the lens driving device can be miniaturized. In addition, since the load on the flexible printed circuit board is removed when the movable lens holding member 21 is driven, control is facilitated and performance is improved.

Further, since the load is not applied to each terminal, the quality can be stabilized.

(Second Embodiment) FIGS. 14 and 15 show a second embodiment of the present invention.

In the first embodiment, the connection from the piezoelectric vibrator 2 to the ground was made by bringing the sandwiching piece provided on the piezoelectric vibrator 2 into contact with the guide bar 1. However, the sandwiching piece and the guide bar 1 are connected to each other. When the movable lens holding member 21 moves, this contact causes a frictional load, which may adversely affect the control. It is also possible that frictional noise is generated. Therefore, the above problem can be solved by adopting the following configuration.

14 and 15 show the structure of the piezoelectric vibrator and the friction material of this embodiment.

In FIG. 14, the upper piezoelectric vibrator 52 of the two piezoelectric vibrators is provided with holes 52a and 52b. The friction members 51a and 51b are slightly smaller than the vertical width and the horizontal width of the holes 52a and 52b, and are formed in a rectangular shape that is high in the height direction. The friction materials 51a and 51b are inserted so as not to contact the outer peripheral surfaces of the holes 52a and 52b, respectively, and fixed to the thin metal plate 53 by soldering or the like.

In FIG. 15, the upper piezoelectric vibrator 52 is provided with an insulating portion 56 (thick line portion).
The electrically conductive portion 58 inside and the electrode portion of the piezoelectric vibrator 52 are completely insulated. The conductive members 58 have friction materials 55a, 55
b is fixed by soldering or the like. A projecting piece 53a is formed on the metal thin plate 53 and is fixed to the conductive portion 58 by soldering or the like.

According to the above structure, the piezoelectric vibrator body is provided with the sandwiching piece and brought into contact with the guide bar as shown in the first embodiment, whereas in the present embodiment, the friction material used for driving is used. Can be used to connect directly to ground.

(Third Embodiment) FIGS. 16 and 17 show a third embodiment.

FIG. 16 shows a structure in which the pressure springs 62a and 62b are bent in an L-shape in front of the supporting member 61 without contacting the supporting member 61, and the tips thereof are directly fixed to the electrodes C and D by soldering. is there. FIG. 17 shows pressure springs 63a, 6
3b is bent in a U-shape in front of the support body 61 without contacting the support body 61, and the elastic piece 6 is formed near the tips of the pressure springs 63a and 63b.
3a-1 and 63b-1 are formed, and the elastic piece 63a is formed.
-1, 63b-1 are brought into direct contact with the electrodes C and D with a pressing force.

According to the above-mentioned structure, it is not necessary to form the support body with the conductor and the insulator, and there is an advantage that the support body can be manufactured very easily.

(Fourth Embodiment) FIG. 18 shows a fourth embodiment.

In the first to third embodiments, power is supplied by the guide bar, but power may be supplied by another member. For example, power may be supplied by a rail member provided in the lens barrel. FIG. 18 is a diagram showing a fourth embodiment in which power is supplied by a rail member.

Reference numeral 78 is a movable lens holding member, 79 is a guide bar which is a driven object, 80 is a support member for the piezoelectric vibrator 2, and a movable lens holding member 78 is provided in the movable lens holding member 78. Slide members that slide in the direction perpendicular to the moving direction of 71, 72 are pressure springs, one end of which is connected to the electrode of the piezoelectric vibrator 2, and the other end has an elastic piece. Embedded rail member 7
5 and 76 are slid in the axial direction of the guide bar 79 with an appropriate pressing force. The rail members 75 and 76 are made of a conductive material, and by energizing the rail members 75 and 76, the piezoelectric vibrator 2 is excited to move the movable lens holding member 7.
8 is movable in the axial direction of the guide bar 79. In addition,
The connection to the ground may be any of the methods of the first and second embodiments.

According to the above-mentioned structure, it is not necessary to form the conductive layer and the insulating layer on the guide bar, and the guide bar 79 with higher accuracy can be formed. Therefore, the movable lens holding member 78 can be moved with high accuracy. It becomes possible.

(Fifth Embodiment) FIG. 19 shows a fifth embodiment.

There is an appropriate value for the pressing force of the elastic piece for supplying power and the pressing force of the friction material and the driven object, and they are not always the same. Therefore, in the fifth embodiment, if the pressing force of the elastic piece and the supply direction of the pressing force of the friction material and the driven object are set to have a relation of being at right angles to each other, the both work independently.

FIG. 19 is a diagram showing the structure. Reference numeral 80 denotes a fixed lens barrel, 81 denotes a movable lens holding member, 79 denotes a guide bar which is a driven object, 84 denotes the piezoelectric vibrator 2 supported via a support 61, and the movable lens holding member 81 has a movable lens. A slide member that slides in a direction perpendicular to the moving direction of the holding member 81, and 85 is a pressure spring, which is always connected to the end portion of the case 86 where the bearing bearing 27 for the roller is installed and the end portion of the slide member 84. Slide member 8
4 is urged to the upper guide bar 79 side. On the other hand, from the piezoelectric vibrator 2, elastic pieces 83a, 8
3b projects outward from the movable lens holding member 81 and presses rail members 82a and 82b provided on the fixed barrel 80.

According to the above-mentioned structure, since the pressing force of the elastic piece for supplying power and the pressing force of the friction material and the driven object can be supplied in the directions perpendicular to each other, when the appropriate values of both are different. Is perfect for.

(Sixth Embodiment) FIG. 20 shows a sixth embodiment.

When the appropriate value of the pressing force of the elastic piece for supplying power in the above-mentioned fourth embodiment is larger than the appropriate value of the pressing force of the friction material 3 to the guide bar 79 which is the driven object. The following configurations are valid for:

FIG. 20 is a diagram showing the structure thereof. In the structure of the fourth embodiment, an elastic piece 91 is provided to press the guide bar 79. Pressing force of the elastic pieces 71, 72 at that time> Elastic piece 91
If the pressure is set so that the pressing force of the friction material on the guide bar can be made smaller than the pressing force of the elastic pieces 71, 72 for supplying electric power, a drive device that can be adapted to the above conditions is provided. be able to.

[0079]

According to the first aspect of the present invention, since it is not necessary to mount the flexible printed circuit board on the movable lens holding member of the lens driving device or the like, a space for making a U-turn of the flexible printed circuit board becomes unnecessary, and the lens The entire driving device can be downsized. Further, unlike the conventional case, the flexible printed circuit board does not become a load when the movable lens holding member or the like is moved, so that a lens driving device which is easy to drive and is excellent in control can be obtained.
Further, since there is no risk that a terminal portion such as a piezoelectric vibrating element or a magnetically sensitive element housed in the movable lens holding member is overloaded or damaged, maintenance problems can be solved.

According to the second aspect of the present invention, it is possible to efficiently obtain the pressure contact frictional force to the friction drive portion of the guide member, and obtain the appropriate propulsive force of the moving member.

According to the third aspect of the present invention, an effective elliptic motion is generated in the friction drive section due to the excitation phenomenon of the electromechanical energy conversion element, for example, the piezoelectric vibrator by the frequency voltage having a phase difference of 90 °. Occurs, for example, the movable lens holding member is smoothly moved in one direction via the moving member, and if the condition of energizing the piezoelectric vibrator, that is, the sign of the applied voltage is reversed, the movable lens holding member is moved. It can be easily moved in the other direction. According to the invention described in claim 4, by securing the contact area of the guide member to the friction drive portion, the thrust of the moving member along the guide member can be effectively obtained, and the flat portion can be used. Due to the surface regulation, it is possible to prevent the generation of the twisting torque around the central axis of the guide member.

According to the fifth aspect of the present invention, the load on the guide member of the moving member is reduced, and, for example, there is no fluctuation due to the position of the movable lens holding member directly connected to the moving member, and good movement drive for control is obtained. .

According to the sixth aspect of the invention, it is possible to feed power to the electromechanical energy conversion element, for example, the piezoelectric vibrator through the support, the lead wiring to the piezoelectric vibrator can be eliminated, and the workability is improved. To do.

According to the invention described in claim 7, the conductive thin film layer can be directly connected to the ground by using the friction drive portion, and the friction load and the generation of the friction noise when the moving member is moved can be eliminated. You can For example, it is possible to reduce the frictional load on the guide member that slides the movable lens holding member of the lens driving device, and to provide a lens driving device that is easy to drive.

According to the invention described in claim 8, it is not necessary to form the support by the conductor and the insulator, and the production of the support becomes extremely easy.

According to the invention described in claim 9, power can be supplied through the rail member.

[Brief description of drawings]

FIG. 1 shows a vibration drive device showing a first embodiment of the invention according to the present application, (a) is a vertical plan view,
(B) is XX sectional drawing of (a).

FIG. 2 is a cross-sectional view of the guide bar of the vibration drive device showing the first embodiment of the invention according to the present application.

FIG. 3 is an overall perspective view of a pressure spring of the vibration drive device showing the first embodiment of the invention according to the present application.

4A and 4B show a mounting state of the pressure spring of the vibration driving device showing the first embodiment of the invention according to the present application, FIG. 4A is a plan view of the pressure spring, and FIG. Side view of (c)
Is a side view after installation

FIG. 5 shows a roller of the vibration driving device according to the first embodiment of the present invention, in which (a) is an exploded perspective view,
(B) is an overall perspective view after assembly

FIG. 6 is a cross-sectional view showing an assembled state of a case, a support and a pressure spring of the vibration drive device showing the first embodiment of the invention according to the present application.

FIG. 7 is a perspective view showing a contact state between a support body and a pressure spring of the vibration drive device showing the first embodiment of the invention according to the present application.

8A and 8B show a state before a guide bar is inserted into a moving member of the vibration driving device according to the first embodiment of the present invention, in which FIG. 8A is a vertical plan view and FIG. ) Y-Y
Cross section

FIG. 9 is a perspective view showing a housed state of the movable lens holding member of the vibration driving device showing the first embodiment of the invention according to the present application.

FIG. 10 is a cross-sectional view showing a conductor contact state of the vibration driving device according to the first embodiment of the present invention.

FIG. 11 is a side view showing the electrodes of the piezoelectric vibrator of the vibration driving device showing the first embodiment of the present invention.

FIG. 12 is a perspective view showing a terminal member of the vibration driving device showing the first embodiment of the invention according to the present application.

FIG. 13 is a perspective view showing a state of the terminal portion of the vibration driving device according to the first embodiment of the present invention, which is housed in the lens barrel.

FIG. 14 is a perspective view showing a state of a piezoelectric vibrator and a friction material of a vibration driving device showing a second embodiment of the invention according to the present application.

FIG. 15 is a perspective view showing a state of a piezoelectric vibrator and a friction material of a vibration driving device showing another example of the second embodiment of the present invention.

FIG. 16 is a side view showing a contact state between the piezoelectric vibrator and the pressure spring of the vibration drive device showing the third embodiment of the present invention.

FIG. 17 is a side view showing a contact state between a piezoelectric vibrator and a pressure spring of a vibration driving device showing another example of the third embodiment of the present invention.

FIG. 18 is a sectional view of a vibration drive device showing a fourth embodiment of the invention according to the present application.

FIG. 19 is a sectional view of a vibration drive device showing a fifth embodiment of the invention according to the present application.

FIG. 20 is a sectional view of a vibration drive device showing a sixth embodiment of the invention according to the present application.

FIG. 21 is a diagram showing the driving principle of the first embodiment.

[Explanation of symbols]

1, 79 ... Guide bar 2, 52 ... Piezoelectric vibrator 3, 51, 55 ... Friction material 4, 61 ... Support body 5, 85 ... Pressure spring 6 ... Roller 7 ... Case 8 ... Cap 11 ... Conductor 12 ... Insulation Layer 13, 14 ... Conductive layer 31 ... Terminal case 32, 33, 34 ... Terminal 62, 63, 7
1, 72, 91 ... Elastic pieces

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location G03B 7/10

Claims (9)

[Claims] 1. An electromechanical energy conversion element for exciting a vibration wave by applying a frequency voltage from the outside, and a friction drive unit attached to a main surface of the electromechanical energy conversion element for extracting and driving the vibration wave. And a sliding member having one end opposed to the friction drive section and the other end connected to the electrode of the electromechanical energy conversion element, and between the friction drive section and the sliding member. In a vibration drive device having a guide member that is relatively sandwiched and driven in one direction relatively by friction drive using the vibration wave of the friction drive unit, the guide member has an external power supply means, and the guide member The vibration driving device is characterized in that the external power feeding means and the electromechanical energy conversion element are electrically connected to each other through electrical contact between the external power supply means and the sliding member. 2. The vibration drive device according to claim 1, wherein the sliding member is also used as a pressing means for pressing the guide member toward the friction drive portion. 3. The guide member according to claim 1, wherein the guide member has an electrode portion that comes into contact with the sliding member and a ground connection portion that comes into contact with the electromechanical energy conversion element side. Vibration drive device. 4. The vibration drive device according to claim 1, 2, or 3, wherein the guide member is a rod-shaped member having an arc surface in cross section, and has at least a flat surface portion that abuts on the friction drive portion. 5. The vibration drive device according to claim 1, wherein the electrode portion of the guide member is formed along the moving direction. 6. The moving member according to claim 1, wherein the moving member has a support made of an insulator that supports the electromechanical energy conversion element, and both sides of the support are provided. Has a conductor in contact with the electrode of the electromechanical energy conversion element, and electrically contacts each electrode of the electromechanical energy conversion element with the sliding member through the conductor. Vibration drive device. 7. The electromechanical energy conversion element according to claim 1, wherein the upper piezoelectric vibrator and the lower piezoelectric vibrator are bonded together via a conductive thin film layer. The friction drive unit is inserted into the rectangular hole formed in the upper piezoelectric vibrator in a non-contact state with the rectangular hole, and the lower side is welded to the conductive thin film layer. A vibration drive device having a rectangular conductive friction member having a height higher than that of the vibration drive device. 8. The power feeding system according to claim 1, 2, 3, 4, 5, 7, wherein the sliding member is directly connected to the lower electrode of the electromechanical energy conversion element supported by the moving member. A vibration drive device characterized by the above. 9. An electromechanical energy conversion element that excites a vibration wave by applying a frequency voltage from the outside, and a friction drive unit attached to the main surface of the electromechanical energy conversion element to extract and drive the vibration wave. A vibration drive device having a conductive elastic member pulled out from an electrode of the electromechanical energy conversion element and a conductive rail member attached to a fixing member near the electromechanical energy conversion element The rail member has an external power feeding unit, and the external power feeding unit and the electromechanical energy conversion element are electrically connected to each other through electrical contact between the rail member and the elastic member. Vibration drive device.