JPS59129841A - Diaphragm device in camera or the like - Google Patents

Abstract

PURPOSE:To make a diaphragm mechanism part simple and compact, and also to make it excellent in its respectiveness by driving a diaphragm by a vibrating wave motor mechanism. CONSTITUTION:A titled device is provided with a diaphragm blade 6 for forming a diaphragm aperture, disphragm blade operating ring 5 for operating this blade 6, vibrating ring 10 vibrated electrostrictive elements 12a, 12b, and a turning ring 13 which is brought to friction and press contacting to this vibrating ring 10. Also, this device is provided with an elastic small roller 16 as an accelerating mechanism which accelerate a motion of the turning ring 13 driven by travelling vibrating wave generated in the vibrating ring 10 basing on a feed to the electrostrictive elements 12a, 12b, and transfers it to a stop-blade operating ring 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an aperture device used in lenses of cameras and other optical equipment, and particularly relates to the structure of an aperture device that uses a motor as a drive source to electrically control the aperture aperture. It is.

Control methods for determining exposure conditions, which are important conditions for projection, include an aperture priority method and a shank-second priority method. In both of these control methods, electrical control processing is performed by a photographic processing system based on various factors that constitute exposure conditions such as subject brightness, film sensitivity, shutter speed, and number of apertures.

In this way, it is believed that current and future camera control systems will incorporate electrical control as an essential requirement to meet the demands for faster and more accurate control. In order to respond to this kind of electrical control on the camera side, proposals have been made to incorporate automatic focusing devices into photographic lenses and zoom lenses driven by motors, but conventional photographic lenses with built-in motors are not available. The single motor is placed on the photographic lens, and the movable member of the photographic lens and the rotation shaft of the motor are connected via a gear train or the like, which makes it impossible to make the photographic lens compact.

There is also a device that incorporates an electromagnetic drive device into the aperture device and controls the entire drive of the aperture blades using electromagnetic force, for example, as disclosed in U.S. Pat. No. 3,813.
No. 7'042. However, in these aperture devices δ, the components of the aperture device and the electromagnetic mechanism are not made common, and the entire device becomes complicated and large.

Also, in recent years, it has been proposed that the diaphragm is operated by a hollow motor in the same way as the diaphragm body. This is because although the outer diameter of the lens can be made compact, the connection part between the motor and the aperture body is complicated and the response of the aperture blades is poor due to insufficient performance of the remoter, or from a price point of view, it is difficult to use a hollow morph. It had drawbacks such as being expensive in itself.

The present invention has been proposed in view of the above, and simplifies and simplifies the diaphragm mechanism by driving the diaphragm using a vibration wave motor mechanism.
It is an object of the present invention to provide a configuration of a diaphragm device using a new drive method, which is compact, has excellent responsiveness, and is low cost.

That is, the present invention provides an aperture blade that forms an aperture aperture, a first movable member that operates the aperture blade, a vibrating member that vibrates by an electrostrictive element (piezoelectric element), and a second movable member that is constantly friction-welded to the vibrating member. and a speed increasing mechanism that speeds up the interlocking movement of the second movable member, which is driven by progressive vibration waves generated in the vibrating member based on power supply to the electrostrictive element, and transmits the speed to the first movable member. The gist of this paper is a print device for a camera etc. which is characterized by the following.

A detailed explanation will be given below based on an embodiment shown in the drawings. In the figure, 1 is the back plate of the blade case, 2 is the entrance opening formed in the back plate, 3 is the front plate of the blade case, and 4 is the hole formed in the top plate.
This is the aperture that determines the open aperture. The blade case back plate 1 and the blade case front plate 3 are integrally joined with an appropriate gap between them.

Reference numeral 5 designates an aperture blade operating ring (windmill) as a first movable member, which is fitted exactly into the inner periphery of the peripheral wall of the blade case top plate 3 and is freely rotatable about the optical axis O-0. Further, a plurality of elongated holes 7 are formed on the surface of the actuating ring 5 at approximately equal intervals along the ring.

A plurality of aperture blades 6 are arranged at approximately equal intervals between the aperture blade operation ring 5 and the back surface of the blade case front plate 3 so as to surround the opening of the aperture blade operation ring 5. Each blade 6 is fitted into a pin 8 implanted in the front base of the blade or into a receiving hole 3a formed in the blade case front plate 3, and is freely rotatable around the pin 8. Reference numeral 9 denotes a pin implanted on the back side of each aperture blade 6, and the tip end of each pin is fitted into each corresponding elongated hole 7 of the aperture blade operating ring 5. Reference numeral 5a denotes elastic tongues formed by cutting at several locations at approximately equal intervals on the outer periphery of the aperture blade operating ring 5, and the free end of each elastic tongue is connected to the blade case top plate 3.
By contacting the back surface of the blade case, the aperture blade operating ring 5 is always urged in the thrust direction away from the blade case top plate 3. When the aperture blade operating ring 5, which is the first movable member, is rotated counterclockwise in FIG. 1, each aperture blade 6 is driven in the direction of reducing the aperture diameter. If the operating ring 5 is rotated clockwise in the opposite direction when the aperture diameter is reduced, each aperture blade 6 is driven in the direction in which the aperture diameter increases.

Reference numeral 10 denotes a vibration ring (stator) as a vibration member that is immovably disposed concentrically with the opening 2 on the inner surface of the blade case back plate 1 via a vibration absorbing member 11. The electrostrictive elements 12a and 12b are bonded and provided in an arrangement according to the operating principle described later.

Reference numeral 13 denotes a rotating ring (rotor) as a movable member of the node 2, and a friction member 13a made of rubber or the like is bonded to the back side of the rotating ring. Reference numeral 14 denotes a leaf spring piece inserted into the case through notch holes 3b formed at several locations on the circumferential wall of the blade case back plate 3 at approximately equal intervals, and the tip of the leaf spring piece is in contact with the surface of the rotation ring 13. The rotary ring 13 is thrust in the direction of the vibrating ring 10, and the friction member 13a bonded to the rotary ring 13 is always held in a state of frictional contact with the vibrating ring 10 surface.

Reference numeral 15 indicates a plurality of pin shafts whose bases are implanted on the inner circumference of the rotary ring 13 by caulking or the like, and which are arranged at approximately equal intervals with their tips facing in the radial direction of the ring, and reference numeral 16 indicates that each of the pin shafts is secured against removal. It is a small elastic roller that is held freely rotatable. Each of these elastic small rollers 16 has an opening 2 on the inner periphery of the blade case back plate l.
It is constantly pressed into contact with the ring-shaped square groove raceway 1a formed along the circumference of the ring 1a by the biasing force in the sliding direction of the rotation 1 nong 13 by the leaf spring piece 14. Also, each elastic small roller 1
The inner surface of the aperture blade operating ring 5 is constantly pressed against the surface opposite to the concave groove raceway pressure contact side of the aperture blade 6 by the biasing force of the elastic tongues 5a.

17aφ17b is a lead wire connecting the power supply terminals 17a' and 17b for the electrostrictive elements 12a and 12b and a power supply control circuit (not shown); 18a is a lead wire connecting the power supply terminal 17a and the electrostrictive element 1;
2a, and a lead wire connecting between the electrostrictive elements 12a and 12a,
18b is a lead wire connecting the power supply terminal 17b, the electrostrictive element 12b, and the electrostrictive elements 12b, 12b.

When frequency currents such as alternating current are applied from the power supply circuit to the electrostrictive elements 12a and 12b via the lead wires 17a and 17b→power supply terminals 17a*17b-+wirings 18a and 18b, respectively, they are arranged in a phase-shifted state. Electrostrictive element 12a.1
2b, out-of-phase strains occur one after another, resulting in progressive vibration waves on the surface of the vibrating ring 10. The progressive vibration wave energy is transmitted to the contact surface between the vibration ring 10 and the friction member 13a on the rotary ring 13 side.
The rotating ring 13 including the friction member 13a serving as the second movable member is driven to rotate about the optical axis 0-O. The direction of the progressive vibration wave generated in the vibration ring 10 can be controlled in both forward and reverse directions by switching the phase of the frequency voltage applied to the electrostrictive elements 12a and 12b. That is, the rotating direction of the rotating ring] 3 can be controlled by switching between forward and reverse directions.

When the rotating ring 13 is driven to rotate, the small elastic rollers 16 attached to the rotating ring move without rotating on the ring-shaped V-shaped concave groove track la. On the other hand, as described above, the aperture blade operating ring 5, which is the first movable member, is always in pressure contact with each of the elastic small rollers 16, so the operating ring 5 is interlocked with the rotation of each of the elastic small rollers 16. Rotationally driven. In this case, the rotation of the operating ring 5 is
The rotary ring 13, which is a movable member, is driven at a speed that is the sum of the rotational speed of the vibration ring 10 and the rotational speed of each small elastic roller 16. That is, since the aperture blade operating ring 13 rotates at twice the speed of the rotary ring 10, the aperture blades 6 open and close at high speed.

The principle of driving the movement of an object by the progressive vibration waves generated using the electrostrictive element described above will be briefly explained.

In FIG. 4, 100 and 200 are a movable body (rotor) and a vibrator (stator) which are brought into frictional contact with each other by an urging member or their own gravity. The X-axis indicates the traveling direction of surface waves occurring on the surface of the vibrator 200, and the Z-axis is the normal direction thereof.

When the surface of the vibrator 200 is vibrated by an electrostrictive element, vibration waves are generated and propagate on the surface of the vibrator. This vibration wave is a surface wave accompanied by a longitudinal wave and a transverse wave, and the motion of the mass point A is a vibration that describes an elliptical orbit.

Focusing on the mass point A, it is performing an elliptical motion with a vertical oscillation width U and a lateral oscillation width W, and when the vibration direction of the surface wave is set to the +X direction, the elliptical motion rotates counterclockwise. This surface wave has an apex A-A... for each wavelength, and its apex velocity ■
is only the X component and V = 2πfu (where f is the frequency)
It is. Therefore, when the surface of the moving body 100 is brought into pressure contact with this surface, since the surface of the moving body contacts only the vertices A-A, the moving body 100 moves in the direction of the arrow N due to the frictional force with the vibrator 200. It will drive in the direction.

The speed of the moving body 100 in the direction of arrow N is proportional to the frequency f. Furthermore, since frictional drive is performed by pressurized contact, it depends not only on the vertical oscillation width U but also on the lateral oscillation width W. That is, the speed of the moving body 100 is proportional to the size of the elliptical motion, and the larger the elliptical motion is, the faster the speed is. Therefore, the speed of the moving body is proportional to the voltage applied to the electrostrictive element.

FIG. 5 shows a vibrator 200, an arrangement of electrostrictive elements 12a and 12b, such as PzT, fixed to the vibrator by adhesive or the like in order to vibrate the vibrator, and generation of standing waves and progressive vibration waves. It shows the correlation between states.

The electrostrictive elements 12a and 12b are attached to the back surface of the vibrating body 200 at such intervals that elastic waves can be most efficiently obtained from the resonant frequency of the vibrating body 200. That is, the electrostrictive element 12
a1112b is arranged so that when only 12a or 12b is driven, the vibrator 200 resonates, that is, a standing wave exists, and the standing wavelength by the electrostrictive element 12a and the standing wave by the electrostrictive element 12b are arranged. The wavelengths are approximately equal and are 900 degrees out of phase with respect to each other's standing waves.
They are arranged at a physical position (pitch) of /4.

For convenience of explanation, the electrostrictive element 12a- in FIG.
12b is not an arrangement in which the elements 12a and 12b in FIG. The positional relationship satisfies the above relationship and is equivalent to each other.

Reference numeral 17 denotes a power source (power supply circuit) for driving this motor, which supplies a voltage of v-v0 sin ωt to the electrostrictive elements 12a and 12b. During driving, a voltage of v=05inωt is applied to the electrostrictive element 12a via the lead wire 18a. Further, a 90° phase shifter 1 is connected to the electrostrictive element 12b via a wiring 18b.
9, a voltage of V=VOsin(ωt±π/2) is applied via the lead wire 18b.

+ and - are switched depending on the moving direction of the moving body 100. That is 9
When the phase is shifted by +900 by the 00 phase shifter 19,
The moving direction of the moving body differs depending on the case where the phase is shifted by -90°.

The graph (a) in FIG. 5 shows that only the electrostrictive element 12a has V, =
When an AC voltage of v6 sin ωt is applied, the same (
b) is the electrostrictive element 12b (V=V, 5in(ωt-
When an AC voltage of π/2) is applied, each vibrator 200
This figure shows a 5-meter vibration caused by standing waves.

Graphs (c), (d), (e), and (f) are electrostrictive elements 12
The vibration state of the vibrator 200 (progressive vibration wave generation state) when the voltages V=V□sinω and V=V6sin(ωt-π/2) are simultaneously applied to a and 12b, respectively. The graph (c) is t=2nπ/
ω, same (d) is L=π/2ω+2nπ/ω, same (e) is t=π/ω+2nπ/ω, g, rough (he) is t=3π/
It shows the time of 2ω+2nπ/ω. The progressive vibration wave travels to the right, but any mass point A (FIG. 4) on the drive surface of the vibrator 200 performs an elliptical motion in the counterclockwise direction. Therefore, the movable body 100 pressed against the vibrator drive surface moves to the left.

In the standing wave state of graphs (a) and (b), the vibrator 200
At the mass point outside the component on the frictional drive transmission surface, there is only lateral vibration, that is, vertical movement as shown in FIG. The state of the friction surface between the movable body 100 pressed against the vibrator 200 is not a static friction state but a dynamic friction state, which reduces the contact area.

Therefore, when moving the moving body 200 in the movement direction by an external force, by generating a standing wave, it is possible to move the moving body 200 with a smaller force than when there is no standing wave.

In the embodiment shown in FIGS. 1 to 3, the vibration ring 10 corresponds to the vibrator 200 in the above principle, and the rotating ring 13 including the friction member 13a, which is the second movable member, corresponds to the moving body 100. .

Further, based on the above principle, an electrostrictive element is disposed on the movable body 100 side to serve as a vibrator and a movable body, and the movable body 100 moves even when the vibrator 200 is used as a mere fixed member. Therefore, 1st to 3rd
In the illustrated embodiment, an electrostrictive element 12aψ is provided on the rotating ring 13 side.
12b is arranged so that the ring serves as a vibrator and rotating ring,
The vibration link IO may be simply a fixed ring member.

In FIG. 3, the groups of electrostrictive elements 12a and 12b may be constructed by partially polarizing a single element instead of arranging a plurality of them.

Thus, in the present invention, the diaphragm drive, that is, the driving of the movable member that operates the diaphragm blades, is performed by the vibration wave motor mechanism using the electrostrictive element as described above. Compared to the source, the structure is simple, there is no winding, the effect is good, and there is no need for a speed reduction mechanism, and the overall aperture device δ configuration is simplified and combined (・
can be made into something. Since the driving force of the vibration wave motor mechanism is transmitted to the aperture blade actuating member via the speed increasing mechanism, it has high responsiveness, and it is possible to mass-produce a compact and high-performance electrically controlled aperture device at low cost. This makes it possible and the intended purpose is well achieved.

FIG. 6 shows an example of a control circuit for driving the diaphragm driving vibration wave motor forward and backward in relation to photometry of a TTL open photometry camera.

In this example, the camera release button is divided into two strokes, the first stroke performs photometry calculations and puts the rotating body 5 of the vibration wave motor into a standing wave vibration state, and the second stroke starts the projection sequence and progresses. The rotating body is driven by vibration waves.

Further, a DC power source is used as the power source, and the DC voltage is converted into a frequency voltage and applied to the electrostrictive element to drive the motor.

A circuit 19 consisting of a light receiving element SPC, an operational amplifier 20, etc. is a photometric circuit that converts subject brightness into an electric signal, and outputs an electric signal corresponding to brightness information (Bv value) to its output terminal. The variable resistors 21 and 22 form projection information input means,
A projection device (not shown) inputs settable film sensitivity information (Sv value) and set exposure information (for example, shutter time value Tv) from the outside, and outputs an electrical signal according to the set values.

23 is an amplifier that performs exposure calculation, and if the aperture value Av to be controlled is the open aperture value Avo, the aperture value △Av to be stopped down from the open position and 'ξ is △Av=Av-Avo, , , , , (1
), the light receiving element S'P
The amount of light incident on C, ie, the output value Bv of SPC.

If the subject brightness is By, then Bvo=Bv-Avo, (2). Here, if we transform the apex calculation formula % formula %, from formulas (1) and (2), (By-Avo)+5v-Tv+Av-Avo=ΔAv
This becomes the output value of the operational amplifier 23. This output value ΔA
The number of aperture stages of the automatic aperture unit is set by v. 24 is an analog-to-digital converter which converts the aperture stage number ΔAv calculated by the calculator 23 into a digital signal.

Reference numeral 25 denotes a pulse generation circuit, which is composed of a slider 25b that moves on the electrode 25a, a resistor 26, and the like. The slider 25a rotates integrally with the aperture blade operating ring 5, and generates a pulse every time the side 1 moves more than the comb tooth-shaped electrode 25a.

Reference numeral 27 denotes a chattering absorbing circuit for removing chattering components from the signal power 1 from the electrode 25a connected to the power source via the resistor 26.

28 is a circuit that controls the aperture operation using an aperture operation signal;
30 of them are made up of the flip-flop circuit power 1, which is set by the power signal C linked to the first stroke of the shirt release and outputs the aperture control start signal Q2. It is reset and outputs signal 2. 29 also includes a flip-flop circuit, and outputs an aperture control start signal A linked to the second stroke of the release.
It is set and turned on by the exposure control signal B and outputs the signal Q1, and is reset by the exposure control completion signal B and outputs the signal Q1. 31
is a monostable multi-by-break circuit which generates an extremely short single pulse in response to the Q1 output of the circuit 29.

32 is a brisettaburda, uncounter, and Q of circuit 29
1 output, and the analog-to-digital converter 24 is reset by the output signal of the monostable multi 31 by the Q1 output.
The output data of the chattering absorption circuit 27 is preset, the preset data is counted down based on the output of the chattering absorption circuit 27, and when the count is completed, a carry output is performed.

SW is a switch that is closed when the aperture is open and opened when the aperture blades are narrowed down even slightly.

34 is a pulse generation circuit, and the output of the oscillator 37 is inputted to the frequency divider 35 via the frequency divider 36 and the NOT circuit 43. The pulse generation circuit 34 is activated by the power signal C,
Such a circuit configuration generates pulse waves having phases different by 90° from each other.

Reference numeral 38 denotes a dry/total circuit for driving the electrostrictive element 12a@12b, and constitutes a push-pull circuit with a plurality of transistors, resistors, knot circuits, etc. 39 is a switching transistor that opens and closes a power source S (direct current) for applying voltage to the electrostrictive element 12a and 40 to apply voltage to the electrostrictive element 12b through a push-pull circuit.

In addition, ANDI.AND, 2.AND3 are respectively AND circuits, OR is an OR circuit, and EXOR is an exclusion-prior-or circuit, which are all well-known.

For projection with the camera configured as described above, the power is turned on at the first stroke of the shutter release, and various circuits such as the photometry and pulse generation circuits are activated.

In the circuit 19, the subject brightness and set projection information Tt value/S
Based on the v value, the aperture control stage number ΔAv is calculated by the arithmetic unit 23, and the ΔAv is converted into a digital value by the converter 24.

The circuit 30 is placed in the set state by the signal C of the first stage of release, and the output of the OR circuit OR is set to "H" by the Q2 output "H" signal, thereby closing the transistor 40. Furthermore, the AND3 outputs an "L" signal and opens the I transistor 39 due to the two outputs "L" and "Lo". Therefore, a voltage is applied to the electrostrictive element 12b, but not to the electrostrictive element 12a.

When the pulse generating circuit 34 is activated by the signal C, the output pulse of the frequency divider 36 is input to the push-pull circuit of the electrostrictive element 12b, so the electrostrictive element 12b vibrates, but the electrostrictive element 12a does not generate voltage as described above. It does not vibrate because no is applied. Therefore, the vibration ring 10 stores vibration energy only by generating standing waves.

Based on the diaphragm control start signal A generated by the second stroke operation of the Rayris, the circuit 30 is put into a reset state, the Q2 output becomes the ° "Lo" signal, Q2 becomes the ° "H" signal, and the circuit 29 becomes the ° "Lo" signal. In the set state, the Q+ ratio output becomes the H" signal and the Ql ratio output becomes the "L" signal. The counter 32 that was applied to the Ql ratio output reset terminal is released from reset, and at the same time the pie break circuit 31 outputs the Q+ ratio output. Based on the signal, the digital value of the converter 24 is preset using preset data manually.

Signal 1 is sent from the frequency divider 35 to the OR circuit EXOR, and when the Q1 output is input thereto, it outputs a pulse whose phase advances by 90 degrees to the frequency divider circuit 36. Since the output Q is also input to AND2, the output of AND2 becomes an "H" signal, and the OR output becomes an "H" signal, which is input to AND3 and keeps the transistor 40 closed. As for the input of AND3, since the Q2 output is a "H" signal, the output of AND3 becomes "H" and the transistor 39 is also closed.

Therefore, drive frequency voltages with 900 different phases are supplied to the electrostrictive elements 12a and 12b, and the vibrations generate progressive vibration waves in the vibration ring 10. This causes the rotation ring J3 to rotate, and the aperture blades The operating ring 5 rotates in the blade narrowing direction to narrow the aperture blades 6 from the open position.

This rotation of the aperture blade operating ring 5 opens the switch SW, and the rough comb-tooth switch 25aφ25b repeats on and off, and sends a number of pulses corresponding to the rotation angle of the aperture blade operating ring 5 through the chattering absorption circuit 27. The counter 32 sequentially counts down to the preset number of aperture control stages. When the count of the counter 32 reaches "0", a carry output ° "H" signal is output and the AN
The output of D2 becomes an "L" signal and is input to the OR. Since the input to the other terminal of the OR is also an "L" signal, the output of the OR becomes "L", and the output of AND3 also becomes "L".

Therefore, both transistors 39 and 4o are opened, and power supply is stopped.

Therefore, the aperture blade operating ring 5 stops at that position, and the aperture blade 6 is narrowed down to the optimum aperture diameter. The aperture value controlled by the aperture blades 6 at this time is an aperture value that is narrowed down by the number of aperture control steps ΔAy from the open aperture value Avo, that is, Avo+ΔAv=Av.

Next, when the exposure of the film surface is completed by the operation of the shutter, the exposure control completion signal B is generated, and the circuit 29 is reset and the Q1 output becomes the "'L" signal, while the Q+ output becomes the "H" signal. Enter AND1. Also, since the switch SW is open, the AND 1 output is
It becomes a signal and is input to OR.

Therefore, the output of the OR becomes ``H'', which is input to the AND3 and closes the transistor 40.Since both outputs of the circuit 30 are ``H'', the output is ANDed with the ``H'' output of the OR.
The output of the transistor 3 is set to ``H'', and the transistor 39 is also closed.

Therefore, power is supplied to both the electrostrictive elements 12a and 12b. Since the Q+ ratio output of the circuit 29 is "L", the output of the frequency divider 35 is E.
90 for the pulse of frequency divider 36 to invert with XOR
A signal with a delayed 0 phase is output.

Therefore, the diaphragm is opened again by the reversal of the rotary ring 10 and the diaphragm operating ring 5 due to the progressive vibration wave in the opposite direction to that described above caused by the vibration of the electrostrictive elements 12a and 12b. When rotated to the open position, the switch SW is closed and an "L" signal is input to ANDI. Then, all the inputs of the OR become "L" signals, so the output becomes °L, and the transistors 39-40
is opened to cut off the power supply to the electrostrictive elements 12a and 12b,
The aperture blades 6 stop at the open position jδ.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a partially cutaway front view, Fig. 2 is an enlarged sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a back plate of the blade case. and a back view with the vibration absorbing member removed, Figure 4 is a model diagram of the movement principle, Figure 5 is the correlation between the arrangement of the vibrator and electrostrictive element, and the generation state of standing waves and progressive vibration waves. Figure 6 shows an example of the control circuit. 1 is the back plate of the blade case, 3 is the front plate, 5 is the aperture blade operating ring, 6 is the aperture blade, 10 is the vibration ring, 12a and 12b are the electrostrictive elements, 13 is a rotating ring and 16 elastic small rollers. Fig. 5 ZOO Fig. 4

Claims (2)

[Claims] (1) Aperture blades that form an aperture diameter, a first movable member that operates the aperture blades, a vibrating member that vibrates by an electrostrictive element, a second movable member that is constantly friction-welded to the vibrating member, and an electrostrictive element. a speed increasing mechanism that increases the speed of the motion of the second movable member driven by progressive vibration waves generated in the vibrating member based on power supply to the first movable member, and transmits the motion to the first movable member. Squeezing device in etc. (2) The speed increasing mechanism includes a plurality of elastic rollers placed between the first and second movable members and arranged around the optical axis, and is fixed to the second movable member, and the rollers are fixed to the second movable member. Claim (1) consisting of a plurality of rotatably supported shafts
A diaphragm device in the camera etc. described in 2.