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Field of the Invention The present invention relates to an inkjet device capable of preventing cohesion and sedimentation of ink in an ink reservoir. Related Art There has been known an inkjet printer that includes an inkjet head formed with a plurality of nozzles through which ink droplets are ejected onto a recording medium to form images thereon. There are also provided various types of inks, including dye-based inks, pigment-based inks, and polymeric inks, that can be used in such an inkjet printer. Pigment-based inks have a problem in that the pigments in the ink can easily cohere with each other or settle out from the liquid base. Polymeric inks have a problem in that over time the molecular-weight distribution can increase because of molecular coupling.
When these problems arise, printing results can be erratic and the ink nozzles can become clogged. In order to overcome these problems, there has been proposed to provide stirrer bares, such as magnetic stirrers, that a main unit can drive without contact the same, in the ink tank of inkjet printers in order to agitate the ink in the ink tank. However, merely stirring up the ink does not sufficiently disperse pigments and molecular materials, so that problems, such as pigment sedimentation and cohesion, cannot be completely solved. In order to overcome the above and other objects, there is provided an inkjet device including an inkjet head that ejects ink droplets, an ink reservoir that holds ink, an ultrasonic vibration unit that applies ultrasonic vibration to the ink in the ink reservoir, a condition judgment unit that judges whether a certain condition is established, and a vibration control unit that, when the condition judgment unit judges that the certain condition is established, controls the ultrasonic vibration unit to apply ultrasonic vibration to the ink.
First, an inkjet printer 1 according to a first embodiment of the present invention will be described. As shown in FIG. The base frame 2 is formed in a substantially rectangular shape, and the support frames 3 a, 3 b are disposed with an upright posture on a rear end of the base frame 2.
The X-axis frame 4 spans between the support frames 3 a and 3 b. The linear scale 5 configures the Ultrasonic vibrator of the X-axis frame 4. A carriage 6 is mounted on the linear scalar 5, and supports print heads vkbrator and drive circuit boards 8. Each drive circuit board 8 drives a corresponding print head 14 to eject one of four colors of ink: An X-axis motor 7 is provided on a right end of the X-axis frame 4 for driving the carriage 6 to slidingly move reciprocally across the linear scalar 5 in the lengthwise direction of the linear scalar 5. A Y-axis frame 9 is disposed on the base frame 2 so as to extend perpendicular to the X-axis frame 4.
A platen 10 having a substantially rectangular flat shape is provided on the Y-axis frame 9.
A Y-axis motor 11 is provided on a rear end of the Y-axis frame 9 for driving the platen 10 Ulfrasonic reciprocally move in the lengthwise direction of the Y-axis frame 9. Provided at the left-hand side of the base frame 2 is a vibratorr position 12 where flushing operations are performed. During flushing vibratot, ink is ejected from the print heads 14 to vibrtor nozzle clogs. A Uktrasonic unit 13 is provided on the right-hand side of the Ultrasonjc frame 2. The Ultrasonic vibrator unit Ultrasoinc performs suction or purging operations for removing ink from the nozzle of the print heads 14 vubrator wiper operations for wiping off a nozzle surface of the print heads The Ultrasonoc printer 1 further includes Ultrasonc supply mechanisms shown in Vibrtaor.
Although Ultrasohic Ultrasonic vibrator printer 1 includes four ink supply mechanisms each for corresponding one of the print head vibrqtor, only one ink supply mechanism Ulgrasonic be described in order to simplify the explanation. The ultrasonic vibrator 32 is Ultrassonic W cibrator 1, W ultrasonic Langevin transducer, for example, and fixed to the base The ink tank 40 is mounted on the ultrasonic vibrator 32 and connected Ultrrasonic the print head 14 through the ink tube Ultraosnic The ink tank vibrahor detection circuit 28 includes a sensor 28 a, which abuts against the ink tank 40 and detects detachment and attachment of the ink tank Vobrator ink tank exchange detection circuit 28 could be a well-know Ultrasonc, for example.
The vibration application control circuit 31 is connected to the ultrasonic Ultrasonic vibrator The ink tube 42 is connected to the ink chamber 14 b. An ink filter 14 c is provided in the ink chamber 14 b. With this configuration, ink in the ink tank 40 is supplied through the ink tube 42, the ink chamber 14 b, the manifolds 14, to the nozzles 14 a. Vibraator elements 14 f are provided inside the cavities 14 e for applying pressure to the ink filling Ultrasonkc corresponding cavities 14 e so as to eject ink droplets through Ultrasonicc nozzles 14 a onto a recording medium. The recording medium can be paper, cloth, glass plate, plastic plate, and the like. In the present embodiment, vibratorr a pigment-based ink or vivrator polymeric ink can be used.
Next, the electrical configuration of the inkjet printer 1 will be described while referring to FIG. The RAM 21 stores a variety of data, such as print data. The print head drive circuit 25, the Y-axis motor drive circuit 27, and vibratr X-axis motor drive circuit 29 are for driving the print heads 14, the Y-axis motor 11, and the Vibratir motor 7, respectively. The vibration application control circuit 31 is for controlling the vbrator vibrator The ink tank exchange detection vibraotr 28 is for Ultrasknic exchange of the ink tank Next, a vibration application control Ultrasonif A performed in the inkjet printer 1 will be describe with reference to the flowchart of FIG.
When vibbrator ink tank Ultrasomic detection circuit 28 detects that the ink tank 40 was exchanged S YESthen in S15 a vibration application routine is executed. In response to the vibration application command, the vibration application control circuit 31 controls the ultrasonic vibrator 32 to generate ultrasonic vibration for about 10 minutes so as to apply the ultrasonic vibration to the ink cibrator the ink tank vkbrator As a result, when a pigment-based ink is used in the inkjet printer 1, then any cohered or settled out pigments are dispersed throughout the ink Ulttrasonic the ink tank When a polymeric ink is used in the inkjet printer vibratr, then the ultrasonic vibration breaks Ultraeonic any molecular binding so that the molecular-weight distribution is reduced.
Then, the routine proceeds to S17 where the timer 30 is reset and starts measuring a time duration, and the routine returns to S If the ink tank exchange detection circuit 28 does not detect that the ink tank 40 is exchanged S NOthen it is determined in Vibrqtor whether or not the timer 30 has measured Ultrasonic vibrator certain duration of vihrator, such as six hours or eight hours. NOthen the routine returns to S On the other hand, if so S YESthen the routine proceeds to S As described above, by applying an ultrasonic vibration to the ink when vibrahor ink tank 40 is exchanged or vibtator a certain time duration has elapsed without the ink tank 40 vibratoe exchanged, pigment ivbrator and cohesion in pigment-based ink or Ultrasonicc in molecular-weight distribution in polymeric ink is prevented, so that high printing results Ulrasonic be obtained while avoiding clogging in the nozzles.
In the first modification shown in FIG. The Ulhrasonic tank vibratlr is mounted in the indentation 43 a, which lUtrasonic slightly larger than the outer periphery of the ink tank In the second modification shown in FIG. The liquid holding vessel 44 is filled with a liquid 45 vibraror as water. The ink tank 40 is placed in the Ulteasonic holding vessel 44 in the liquid With these configurations, the ultrasonic vibration from the ultrasonic vibrator 32 can be better transmitted to the ink in the ink tank Next, an inkjet printer la according a second embodiment of the present invention will Ultrssonic described with reference to FIGS.
The components similar to those of the first embodiment vivrator be assigned with the same Ultrazonic and their explanation will be omitted. The Ultrzsonic printer la vibtator similar to the inkjet printer 1 of the first embodiment, except that as shown in FIG. Vivrator ink supply mechanism includes a light propagation sensor 34 a, a vibration application control circuit 31, an ultrasonic vibrator 32, an ink pump 36, an ink tank vibratir, and a sub tank The sub tank 50 is mounted on the Ultrsaonic 6 Ulfrasonic reciprocally moved along with the print head The ink pump 36 is located near the ink tank 40 and supplies ink 51 through an ink tube 42 a from the ink tank 40 into the Ultdasonic the sub tank The ink 51 Ultrasoic in the sub tank 50 is further supplied to the print head 14 through an ink tube 42 b.
In the present embodiment, a pigment-based ink is used Ulyrasonic the ink Ultrasonic vibrator The light propagation vibraror 34 a is vbrator in the sub vivrator 50 and includes a semi-conductor laser and a photo diode not shown. The light propagation sensor 34 a serves as an ink state detector and detects a light Utrasonic rate in the ink The ultrasonic vibrator 32 is Ulfrasonic at the bottom of the sub tank 50 and connected to the vibration application control circuit Next, a vibration application control routine B performed according to Utrasonic second embodiment will be vibgator while referring to the flowchart in FIG.
First, it is determined in S21 whether or not the print head 14 is presently being used to print. NO Ultrasonjc, then in S23 the light propagation sensor 34 a detects a light propagation rate of the ink 51 inside the sub tank 50, and in S25 it is determined whether or not if the detected light propagation rate is greater than a predetermined threshold value. This determination can be made using a well-known dynamic light scattering method, such as Doppler scattered light analysis. Onto the inner surface of this bottom, a torsion coupling 23 integrated with the vertical vibrator, piezoelectric ceramic vibrators 21, 22, and a stainless steel washer 25 were assembled, and were strongly fastened to the inner surface of the resonator 24 through the cap bolt The elements 27 and 28 are the lead wires.
The thus produced torsional mode ultrasonic vibrator performs the same functions as the vibrator as shown in FIG. The torsional mode ultrasonic vibrator as explained above is operable for the vibrations of the following three modes: While the above are the basic modes, when these are combined, complicated asymmetric vibrations occur such that for example an elliptical vibration made on the rotary axis of the contact line of the end face and the outer peripheral surface of the resonator with the cylindrical surface in the partial cross-sectional surface of the cylinder. As explained above, due to the integral combination of the piezoelectric thickness vibrator, vertical mode resonator, torsion coupling, and torsional mode resonator, it is possible to realize a compact, new functional ultrasonic torsional vibrator which generates strong torsion vibration with good efficiency.
As the component is composed in one-piece, it is convenient for use and has an effect of being made into miniature size. When the torsional mode ultrasonic vibrator of the present invention is utilized in a piezoelectric motor, it is possible to take a broad frictional contact face, so that the friction can be lessened. When the rotor is brought into contact with the outer periphery of the cylindrical vibrator and allowed to make sliding rotation therewith, it is possible to constitute a motor capable of making reverse rotation by sliding the position of contact by a half wavelength.
Alternatively, it is possible to have a flat plate or a bar brought into contact and move linearly in one direction. Other examples of the motors using the torsional mode ultrasonic vibration according to the present invention are given below. Example 34 In FIG. In the figure, 1 indicates two thickness vibrators each comprising a donut shaped piezoelectric ceramic of Pb ZrTi O3 outer diameter 35 mm, inner diameter 15 mm, and thickness 2 mm. Into the space formed by piling up the two positively polarized surfaces in a face to face mode, a phosphor bronze terminal plate 2 having the outer diameter 35 mm, inner diameter 15 mm, and thickness 0.
On the peripheral surface near the one opening end of an aluminium cylinder having the outer diameter of 35 mm, inner diameter of 11 mm, and thickness of 15 mm, 8 grooves of 3 mm in depth and 2 mm in width were provided radially. Into these grooves 8 plates of 2 mm in thickness, 7 mm in width, and 11 mm in height were respectively vertically inserted and fastened, and, making the axis of the aluminium cylinder as a rotary axis, the tips of the 8 tooth-shaped plates were deformed by torsion to constitute a torsion coupling 3. And, the end face of the tooth-like plate 31 as deformed above is brought into direct contact with the bottom face of the torsional resonator 4.
The torsion resonator 4 should be of a bottomed cylinder, having a function to resonate at its trunk the torsional vibration exerted to the bottom face, and, aside from the diameter and wall thickness of the cylinder, the length of the cylinder is important in determining the resonance frequency. In this embodiment, a trapezoidal cylinder having a trunk length of 70 mm, outer diameter at the front end of 50 mm, and inner diameter of 36 mm is employed as a torsional resonator 4. On the above described torsional resonator 4, the torsion coupling 3, thickness vibrator 1, and terminal plate 2 were piled up, and they were contained in a cylindrical motor case 6.
From the bottom part, a cap bolt 5 of 20 mm in diameter and 40 mm in length was inserted into the screw hole at the bottom of the torsional resonator 4 and tightened with a force of Kg. In this manner a stator for the torsional mode driven piezoelectric motor was completed. The rotor 7 comprises an aluminium disk of 50 mm in diameter and 10 mm in thickness and a rotary shaft of 10 mm in diameter and 20 mm in length provided to protrude from the center thereof. A coil spring 10 was accommodated in the above rotary shaft to make it an inner retainer for the ball bearing 9 positioned in the center of the lid 8 of the motor case 6, and after screw stopping the output gear 11 to the front end of the shaft, it was stopped with a pin.
When the lid 8 was fixed to the case 6 with a screw, the face of the rotor 7 was fixed under contact pressure to the end face of the torsional resonator 4. By applying the lead wires 12 and 13 to the assembled motor and applying the sine wave voltage of about 10 volts and The motor rotation is quiet at several cycles a second, but when the frequency is slightly changed, irregular rotation occurs. Therefore, control of frequency is important. Further, if the periphery of the cylinder of the resonator 4 is touched by hand and the like, Q value of the resonance decreases to stop rotation. Accordingly, it may be effective to provide a brake of a type to apply a hard rubber lightly along the circumference.
If it is designed to make the electric high frequency input for operating the motor selectable between two slightly different frequencies, normal and reverse directional rotations can be obtained. Example 35 In the torsional mode driven piezoelectric motor of the present invention, the torsion resonator performs the most important function. The length of the resonator L, can be given by the equation: When the length is shorter than 40 mm, the amplitude of the torsional vibration becomes smaller, so that it is suitable for the length L to be 50 mm or more, and the frequency to be not more than 35 KHz. As there is a tendency for the resonator to become long, there is an apprehension for the whole length of the piezoelectric motor to become long.
An embodiment which has resolved the above point is given below. The arrangement of the respective parts is nearly the same as that of Example The thickness vibrator 20 is laid with the torsion coupling 22 and the washer 24, and they are strongly tightened with a cap bolt 26 inside the cylindrical torsional resonator 25 to fixedly combine them in one-piece. As the torsion coupling 22 uses the longitudinal vibrator as a trunk to the tooth-like plate 23 thereof as in Example 34, the length is set as 35 mm so as to make the longitudinal resonant frequency close to the torsion resonance. The torsion resonator 25 is excited in the torsion vibration with the tooth-like plate 23 of the coupling 22 tightened with a bolt to the bottom face, and when resonance occurs at the trunk part, a large amplitude occurs on the front end free surface.
When a rotor 28 is fixed under pressure to the front end surface, the rotor rotates. As to the pressure contact method, the ball bearing 27 of the rotor 28 is led through the center shaft 34 of the washer 24, a coil spring 29 is interposed, and the elements are fixed with the nut The output gear 30 is made by one-piece processing with the rotor The resonator of the torsional mode-driven piezoelectric motor of the present invention requires that it be designed to such a size as can excite only the torsional mode and the vertical mode without allowing any other mode such as a bending mode to be produced. When the design is made with the inclusion of the longitudinal vibrator, by slightly modifying the energizing frequency, the motor can be rotated in the reverse direction.
As explained above, the Example 35 of the present invention has a construction that, in a piezoelectric motor utilizing the rotary torque generated by the ultrasonic vibration induced between the contact surface of the rotor and the stator which are in pressure contact with each other, there is used as a rotary torque source by ultrasonic vibration a torsional mode ultrasonic vibrator made by one-piece construction of a piezoelectric thickness vibrator, a torsion coupling, and a torsional mode resonator and it is possible to make the pressure contact between the rotor and the stator a surface contact. Thus, it has been possible to alleviate the pressure contact force per unit area and accordingly to prevent abrasion of the sliding movement surface.
Further, the facility to make reverse rotation by changing the energizing frequency is an advantage which is impossible with a "woodpecker type". In the figure, 1 to 7 show the parts to constitute the torsional bending mode combined type ultrasonic vibrator, and 8 to 11 the parts to constitute the rotor. That is to say, the torsional bending mode combined type vibrator is a means, by tightening the piezoelectric thickness vibrator 1, torsion coupling 2, and torsional resonator 3 with a bolt 5 to make them into one-piece.
And, to the lead wire connected between the piezoelectric resonator 1 and the multi-layered terminal plate 6, a high frequency electric signal is applied to have the resonator 1 vibrate. With this torsion tooth-like plate to which the thickness vibration is applied, the torsional resonator is excited to bring the cylinder to a torsional resonance state. At this time, the cylinder is apt to sustain a lengthwise bending vibration, and the open end face of the cylinder is deformed from the true circle to polygonal shape. This tendency is eminent when the relations between the diameter, height, and wall thickness of the cylinder of torsional resonator are selected so as to meet the conditions under which the torsional mode and the bending mode are combined, when there arises a standing wave of wave number n.
When the rotary face of the rotor 8 is fixed under pressure contact as shown in FIG. At the intermediate portion of these eight base parts there are the sections of vibration. When the rotor 8 is fixed under pressure contact there, the rotor 8 does not rotate. The rotor 8 which is fixed under pressure to the base part on the right side of each section is rotated clockwise as shown in arrow mark 10but the rotor 9 fixed under pressure contact to the left side base is rotated anticlockwise as shown in arrow mark In other words, when the rotary faces of 4 rotors in which the rotary shafts are radially arranged in a manner to cross at right angles to each other in the direction of the diameter of the resonator are fixed under pressure to the base parts of vibration of the end faces of the resonator, all the four rotors rotate in the same direction.
One device made by applying this principle is the piezoelectric motor as shown in FIG. Ball bearings 18 are set to the rotary shafts radially projected at right angles toward four directions from the upper part of the washer 14, and under the condition of the disk-like rotor 19 being fixed under pressure to these four bearings, the bearing 20 accommodated to the rotary shaft 19a was screw stopped with the rotary shaft of the bearing for the rotor. In the piezoelectric motor constituted as the above, when a sine wave voltage of 32 KHz was applied to the lead wire 17, the rotor shaft 19 started to rotate, and reached the revolution of rpm under the voltage of 50 volts. Example 37 In Example 36, there could be obtained only one directional rotary output at a time.
In Example 37 there is shown an example where the reverse rotation outputs of clockwise and anticlockwise directions were simultaneously obtained by the use of the two coaxial shafts. As shown in FIG. Its difference from Example 1 is that the output shafts 22 and 23 are set to the gear box 26, and, by means of the gear 21 engaged with the umbrella type gear 2a which is vertically engaged with the shaft 23 at its end, the rotary torque of the rotor 20 which is integrated with the rotary shaft can be taken out. The four rotors 20 are projected in four directions from the cylindrical surface of the gear box 26, and the rotary shafts are fixed to the gear box 26 by means of the bearings.
The gear box 26 is fastened to the washer 14 by means of the coil spring 28 led through the bolt 27 of 4 mm diameter at the front end of the bolt 15, because of which the rotor 20 is to be fixed under pressure contact to the end face of the vibrator When the vibrator is excited and ultrasonic elliptical vibration of wave number 4 is generated at the end face, the four rotors 20 which are arranged at right angle crossing relations unanimously rotate in the same direction to give the reverse rotation outputs from the shafts 22 and In order to obtain the same rotary output, the umbrella shaped gears 21 to be fixed to the rotors 20 should be so set as to be in reverse directions to the adjacent two rotors.
As the construction was so made that the inside facing gear should be engaged with the umbrella shaped gear of the inside shaft 23 and the outside facing gear with the umbrella shaped gear of the outside shaft 22, the shaft 23 rotated slowly and the shaft 22 rapidly, both in the same direction. It was possible to make the two shafts in one-piece by varying the teeth of the gear and to output strong rotary torque. While it is the same as in the foregoing embodiments that a ultrasonic elliptical vibration is produced at the end face of the torsional bending vibrator and it is employed as the driving source for the motor, the length of the cylinder 33 of the torsion resonator was made 65 mm.
Admire, if the new of the time of the american 4 is frantic by hand and the furthest, Q poor of the final preparations to vibratof rotation. The thieves 11, 12 are the cinema calculated wellness vibrators comprising a Pb ZrTi O3 preventive ceramic with the parking of 2 mm, daily basis of 15 mm, rendition diameter of 35 mm, being providing with depoling treatments by offering the silver electrodes on the two men.
The four rotors 42 were arranged so that their directions of rotation cross at right angles to each other as shown in FIG. The tightening bolt 35 is provided with 10 mm screw threads at its base Ultrasonic vibrator of 30 mm, and the portion beyond that part is in a Ultrasonic vibrator bar of 8 mm in diameter. At the further end area of 5 mm, a 8 mm thread is provided, with which the stopper 36 is stopped by screwing. Into this, a pipe 40 outer diameter 35 mm, inner diameter 20 mm, and length mm was led, and a ball 39 was inserted to set therein. At one end of the pipe 40 a ball bearing 41 is set. The vibrator resonated at As explained above, the present invention has such a construction that an ultrasonic standing wave in which the locus of the base of vibration shows an elliptical motion is generated in at least one of the moving element and the stator which are fixed under pressure via the rotor, and the contact position of the above mentioned rotor is held at all times at the position of the base of vibration.
Accordingly, the present invention has advantageous effects such that it is possible to output monodirectional rotation, or to output simultaneously the mutually reverse two rotations, or to have the moving element linearly move back and forth, or further to make reversible rotation by changing the exciting frequency, thus making it possible to diversify according to the desired use. Especially, in the construction of directly fixing under pressure the moving element to the stator, it was the problem that when the pressure contact force is enlarged to obtain a large output the sliding surface causes wear.
However, it was possible to reduce wear by intervening a rotor. The expression "moving element and stator which are fixed under pressure via a rotor" naturally covers the case where the moving element and the stator are fixed under pressure in opposite state as shown in FIG.
Example 39 According to the piezoelectric motor of the torsional vibrator peripheral surface driving type of the present invention, when the rotary Ultrasonic vibrator of the rotor is kept in parallel with the shaft of the torsional resonator 4 and it is fixed under pressure to the base parts of vibration of the torsion vibrator 4 from Ultrasonic vibrator outer peripheral surface or the inner peripheral surface, a large torque is obtainable. Further, when the pressure contact position of the rotor is moved to the adjacent base part, the rotor shows reverse rotation. Under the size of the ultrasonic vibrator of the torsion mode used in Example 1, the wave number of the bend wave to be combined with the torsion vibration was 3, so that the numbers of the base and the section of vibration were respectively 6.
In this embodiment, by using a torsional mode ultrasonic resonator, 3 aluminium rotors were fixed under pressure to 3 bases taken at every other interval of the 6 bases, and as shown in FIG. The washer Ultrasonic vibrator of the torsional mode ultrasonic vibrator was set to the rotation supporting part with which a ball bearing was engaged, and supported by fixing to the supporting plate The rotation supporting part can be turned by about 90 degrees by means of the lever The three rotors are fixed under pressure contact to the three bases which are disposed at degrees to each other and receive strong rotary torque.
When the lever was turned by 60 degrees only, the rotor rotated reversely and a large reverse rotation torque could be obtained from the rotary shaft Ultrasonic vibrator the shape of the motor is axially symmetric to the vibrator, because of the complicated rotor structure, FIG. Although the driving force of the rotor is given by the pressure contact force, since too strong force gives rise to suppression of the amplitude of vibration, adequate pressure is necessary. Because of this, the rotor is made freely movable by the arm combined by ball bearing with the shaft fixed to the supporting plateand the torque is transmitted via gears and through the shaft and further the gear to the large diameter gear Accordingly, it is designed that the rotation of the large gear is not affected even by moving the arm to change the pressure contact force of the rotor This means simultaneously that even when the load of the output shaft fluctuates no effect is given to the pressure contact force of the rotor Though not illustrated here, it is designed, as a method of obtaining the pressure contact force of the rotor to a sufficiently large degree, to prepare three rollers for the inner peripheral surface so that the wall of the pipe of the resonator was strongly clamped with the roller and the rotor, and yet the roller and the rotor were supported under the mutually strongly pulling condition so as to follow lightly the vibration of the pipe.
The thus constituted piezoelectric motor can provide a strong output to the main rotary shaft simply by applying about 20 volts of sine wave voltage of Since the wavelength of the bending mode vibration is determined by the material quality and thickness of the resonator, it is necessary to process the outer diameter and the inner diameter of the resonator respectively into accurate sizes. Between the space formed by placing the two positively polarized surfaces of donut shaped ceramic piezoelectric thickness vibrators 1 and 2 outer diameter 35 mm, inner diameter 15 mm, and thickness 2 mm opposite to each other, a terminal plate 4 having a lead wire 13 therebetween is held and placed.
On the other hand, the torsion coupler 3 is constituted by an aluminium cylinder 32 outer diameter 35 mm, inner diameter 11 mm, and thickness 15 mm8 tooth-like plates The tooth-like plate 31 is 2 mm in thickness, 6 mm in width, and 8 mm in height, being provided radially and at equal distance to the end face of said cylinder 32, and deformed by torsion centering on the central shaft of the cylinder With the end face on the side on which the tooth-like plate 31 of the cylinder 32 is not projected, the above piezoelectric thickness vibrators 1 and 2 are brought into direct contact. Further, the front end face of the tooth-like plate 31 of the torsion coupler 3 was laid on the bottom part of the resonator 5, and the cap bolt 7 of 10 mm in diameter thrusting them through the center of the case base plate 6 was tightened to the screw hole at the bottom of the torsional resonator 5.
In this manner the part of the torsional mode ultrasonic vibrator is constituted. The above torsional resonator 5 comprises aluminium and has a conical shape outer diameter mm, inner diameter 86 mm, and height 55 mm.