JP6273434B2 - LINEAR DRIVE DEVICE, ELECTRONIC DEVICE USING LINEAR DRIVE DEVICE AND BODY - Google Patents

Description

  The present invention relates to a linear drive device used for an input device such as a touch panel, an electronic device using the linear drive device, and a body-wearable product.

  Conventionally, a display device incorporating a touch panel function and an input device using operation keys have been introduced. Among these, a linear drive type vibration device was built in beforehand, and when the operator entered information by pressing with a finger or pen, the vibration was returned to the finger or pen for reliable operation. There is something that gives the operator a feeling. As such a linear drive type vibration device, for example, in Patent Document 1, a piezoelectric actuator having one end fixed to a pedestal and a weight via a damper at the other end of the piezoelectric actuator are provided. Proposed.

JP 2011-245437 A

  However, there is room for improvement in improving the tactile feedback that gives the operator a feeling that the operation has been reliably performed by returning vibration to the finger or pen when the input operation is performed.

  The present invention aims to solve the above-described problems, and can improve tactile feedback that gives the operator a feeling that the operation has been performed by returning vibration to the finger or pen when an input operation is performed. It is an object of the present invention to provide a linear drive device, an electronic apparatus using the linear drive device, and a body-worn product.

In order to achieve the above object, the present invention proposes
A drive shaft that is axially displaced;
A fine vibration generating member connected to one end of the drive shaft and causing the drive shaft to move in the axial direction;
A housing that supports the drive shaft such that the drive shaft is displaceable in the axial direction;
A movable body coupled to the drive shaft so as to be movable in the axial direction of the drive shaft by displacement of the drive shaft in the axial direction;
The fine vibration generating member is formed of a thin plate having an elastic thin plate and an outer shape corresponding to the elastic thin plate, and includes an elastic thin plate arranged on at least one surface of the elastic thin plate, and a driving voltage is applied to the elastic thin plate. Is transformed into a bowl shape by applying
One end of the drive shaft is connected to the center of the fine vibration generating member,
The fine vibration generating member is a linear drive device characterized in that a peripheral portion is fixed to the housing at equal intervals in the circumferential direction with points.

  Furthermore, what this invention proposes is an electronic device provided with the linear drive device mentioned above, or a body wearing article.

  With these configurations, the intended purpose can be achieved.

  According to the present invention, when an input operation is performed, the linear drive device capable of improving the tactile feedback that gives the operator a feeling that the operation has been reliably performed by returning vibration to the finger or pen, and the linear drive An electronic device and a body-worn product using the device can be provided.

It is the longitudinal cross-sectional view seen from the diagonally upward direction which shows the structure of the linear drive device of Embodiment 1 of this invention. It is the longitudinal cross-sectional view seen from the diagonally upward direction which shows the state which the moving body moved to the upper direction of the drive shaft in the linear drive device shown in FIG. It is the longitudinal cross-sectional view seen from diagonally upward direction which expanded and represented a part of FIG. It is the longitudinal cross-sectional view seen from diagonally upward direction which expanded and represented a part of FIG. It is a perspective view of the linear drive device of Embodiment 1 of this invention. It is the longitudinal cross-sectional view seen from the diagonally upward direction which shows the structure of the linear drive device shown in FIG. It is a disassembled perspective view which shows the structure of the linear drive device of Embodiment 1 of this invention. It is sectional drawing showing an example of the coupling | bonding form of the support body with respect to a drive shaft. It is a disassembled perspective view which shows the structure of the linear drive device of Embodiment 2 of this invention. FIG. 10 is a perspective view of the linear drive device illustrated in FIG. 9. (A), (b) is a figure explaining the air flow state inside and outside a housing | casing at the time of a raise of a moving body at the time of a raise in a linear drive device shown in FIG. (A)-(f) is the figure seen from the lower part showing the embodiment of the attachment structure of a fine vibration generating member and a housing | casing. It is a figure explaining the time change of the position of a moving body.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the embodiments, and variously within the technical scope grasped from the description of the claims. It can be changed.

(Embodiment 1)
A linear drive device according to Embodiment 1 of the present invention will be described with reference to the drawings. In the drawings, description will be made with the upper side of the paper as the upper side and the lower side as the lower side.

  The linear drive device 1 shown in FIG. 5 is used for an electronic device such as an electronic device in which a touch panel function is incorporated in a display device or an input device using operation keys. These electronic devices have a built-in linear drive type vibration device in advance, and when the operator inputs information by pressing with a finger or pen, the vibration is returned to the finger or pen to ensure Some give the operator a feeling that the operation has been performed.

  As shown in FIGS. 1 to 7, the linear drive device 1 according to the first embodiment includes a drive shaft 9, a fine vibration generating member 8, a housing 3, and a moving body 14.

  The housing 3 supports at least one of the drive shaft 9 and the fine vibration generating member 8 so that the drive shaft 9 can be displaced in the axial direction. In the illustrated embodiment, the housing 3 supports the drive shaft 9 so that the drive shaft 9 can be displaced in the axial direction.

  1 to 7, the lower end which is one end of the drive shaft 9 is connected to the fine vibration generating member 8. The fine vibration generating member 8 is structured to be supported by the housing 3 only via the drive shaft 9.

  The moving body 14 is coupled to the drive shaft 9 so as to be movable in the axial direction of the drive shaft 9 by displacement of the drive shaft 9 in the axial direction, and reciprocates on the drive shaft 9 in the axial direction of the drive shaft 9.

  1 to 7, the casing 3 has a cylindrical shape with an open upper end, and the end surface on the upper end is in contact with the lower surface 2 b of the electronic device main body. Moreover, it has the structure provided with the cover 4 which plugs up an upper end side opening, and the cover 4 can also be considered as a part of housing | casing. As shown in FIG. 5, the cover 4 includes a plurality of cover openings at predetermined intervals in the circumferential direction.

  Through holes are formed in the center of the bottom surface of the housing 3 and the center of the cover 4 at a position corresponding to the center. A drive shaft 9 is inserted into each through hole via bushes 10 and 5.

  For this reason, in the illustrated embodiment 1, the line connecting the center of the through hole formed in the center of the bottom surface of the housing 3 and the center of the cover 4 is provided so as to be perpendicular to the bottom surface of the housing 3 and the cover 4. .

  The drive mechanism that moves the moving body 14 includes the fine vibration generating member 8 and the drive shaft 9.

  The fine vibration generating member 8 is made of a thin plate including an elastic thin plate 6 and stretchable thin plates 7 a and 7 b disposed on at least one surface of the elastic thin plate 6. In the illustrated embodiment, the elastic thin plate 6 is a bimorph type in which stretchable thin plates 7 a and 7 b are fixed to the upper and lower surfaces, respectively.

  By applying a driving voltage to the elastic thin plates 7a and 7b, the elastic thin plates 7a and 7b expand and contract, and the elastic thin plate 6 to which the elastic thin plates 7a and 7b are fixed has a central portion and a peripheral portion in the normal direction of the elastic thin plate 6. Relative displacement. As a result, the fine vibration generating member 8 is deformed into a bowl shape.

  The stretchable thin plates 7a and 7b are composed of a piezoelectric material or an electrostrictive material in which an electrode material is attached to both surfaces. For example, copper or a copper alloy is used as the electrode material. Examples of piezoelectric materials and electrostrictive materials include lead zirconate titanate, barium titanate, lead magnesium niobate, and the like. The elastic thin plates 7a and 7b are formed in a circular shape or a polygonal shape.

  For the elastic thin plate 6, for example, an elastic material such as copper or copper alloy is used. Although not shown, a unimorph type in which only the elastic thin plate 7 a or 7 b is provided on one side of the elastic thin plate 6 may be used. The elastic thin plate 6 preferably has an outer shape corresponding to the stretchable thin plate 7a or 7b, but it does not need to be made to correspond.

  The elastic thin plates 7 a and 7 b are fixed to the elastic thin plate 6 with, for example, a conductive adhesive, and wiring for applying a voltage to the elastic thin plates 7 a and 7 b is provided on each of both surfaces of the fine vibration generating member 8. Although not shown, this wiring is connected to the drive control unit.

  The drive shaft 9 is light and highly rigid, for example, a carbon-based material is used and is formed in a column shape.

  One end of the drive shaft 9 is connected to the fine vibration generating member 8. In the illustrated embodiment, the shaft tip, which is one end of the drive shaft 9, is fixed to the central axis of the fine vibration generating member 8. As a form to fix, the front end surface of a shaft front-end | tip part can be fixed to the surface of the fine vibration generation member 8 with an adhesive agent, for example. In the illustrated embodiment 1, the adhesive portion of the drive shaft 9 with the fine vibration generating member 8 is thick. The drive shaft 9 itself has the same thickness up to the tip surface, or the area of the tip surface is smaller than the cross-sectional area of the drive shaft 9 main body. By making the tip of the drive shaft 9 thinner, the area of the fine vibration generating member 8 that contributes to actual deformation can be increased.

  Instead of the structure in which the shaft tip portion of the drive shaft 9 is fixed to the fine vibration generating member 8, a configuration may be adopted in which a through hole is provided in the fine vibration generating member 8 and the side surface portion of the shaft tip portion is fixed.

  As described above, the drive shaft 9 is supported by the housing 3 via the bushes 5 and 10 so as to be displaceable in the axial direction.

  The bushes 5 and 10 are elastic members such as rubber for supporting the drive shaft 9, and have a center hole for inserting the drive shaft 9.

  The bush 5 disposed in the through hole in the center of the cover 4 is bonded and fixed to the inner end of the center hole at the tip of the drive shaft 9 on the other end opposite to the one end fixed to the fine vibration generating member 8. To do.

  On the other hand, the bush 10 disposed in the through hole at the center of the bottom surface of the housing 3 is only pressure-supported from the outside without the drive shaft 9 being bonded and fixed to the inner surface of the center hole.

  With this configuration, the drive shaft 9 is displaced in the axial direction, but the drive shaft 9 itself does not move a long distance like the moving body 14 due to the displacement.

  The moving body 14 is coupled to the drive shaft 9 so as to be movable in the axial direction of the drive shaft 9 by displacement of the drive shaft 9 in the axial direction.

  In the first embodiment, the movable body 14 includes an annular support portion 11 that is movably coupled to the drive shaft 9 and annular weight portions 14 a and 14 b that are configured separately from the support portion 11. And a plate-like body 13 that connects the support portion 11 and the weight portions 14a and 14b.

  As a form in which the annular support portion 11 is coupled to the drive shaft 9 so as to be movable in the axial direction, frictional coupling can be employed.

  As the first form of friction coupling, there is one in which the annular support portion 11 is frictionally coupled to the drive shaft 9 by tightening the annular support portion 11 from the outer peripheral side by the annular tightening means 12.

  The embodiment shown in FIG. 8 is an example of this. The annular support portion 11 is configured by combining two divided bodies 11a and 11b having the same shape. Openings 11c and 11d for accommodating the drive shaft 9 are formed at positions corresponding to the drive shaft 9 of the respective divided bodies 11a and 11b. When the divided bodies 11a and 11b are combined with the drive shaft 9 interposed therebetween, a gap is formed between the mating surface 11e of the divided body 11a and the mating surface 11f of the divided body 11b. The annular support portion 11 is frictionally coupled to the drive shaft 9 by tightening from the outer peripheral side by the annular tightening means 12.

  The divided bodies 11a and 11b constituting the support portion 11 can be made of metal such as stainless steel, for example. Thereby, durability of the support part 11 can be improved.

  As the annular fastening means 12 that is mounted on the outer periphery of the annular support portion 11 and tightens the support portion 11 from the outer peripheral side in the radial direction centering on the drive shaft 9, for example, a coil spring is used. Can be used.

  Alternatively, a heat-shrinkable resin may be filled between the mating surface 11e and the mating surface 11f and tightened with the heat-shrinking force of the heat-shrinkable resin.

  Further, the contact portion between the drive shaft 9 and the support portion 11 is preferably point contact when viewed in a cross section as shown in FIG. It is easy to maintain a stable frictional coupling state.

  As a form 2 of the friction coupling, a form having a support part through hole through which the drive shaft 9 is inserted in the center of the support part 11, and a form in which the heat shrinkable resin thermally contracted is filled in the support part through hole. Can be adopted.

  The heat-shrink force of the heat-shrinkable resin filled in the support portion through hole becomes a friction force that pressurizes the drive shaft 9 from the outside.

  An inner peripheral side of the plate-like body 13 is fixed to the support portion 11, and annular weight portions 14 a and 14 b are coupled to the outer peripheral side of the plate-like body 13.

  In the illustrated form, annular weight portions 14a and 14b are attached to the upper and lower surfaces on the outer peripheral side of the plate-like body 13, respectively.

  A protrusion 15 is provided on the upper end surface of the upper weight portion 14a (the surface facing the other end side opposite to one end of the drive shaft 9). In the illustrated form, a total of three protrusions 15 are formed at positions corresponding to each of the three cover openings provided in the cover 4 of the housing 3.

  As described above, the protrusion 15 may be formed so that the upper end surface itself of the upper weight portion 14a swells upward. Alternatively, a hemispherical body may be bonded to the upper end surface of the upper weight portion 14a, or a concave portion may be provided on the upper end surface of the upper weight portion 14a, and a spherical body may be bonded to the concave portion. Also good. It is not tied to the formation method.

  As shown in FIG. 1 to FIG. 7, the moving body 14 moves to the upper side of the drive shaft 9 so that the protrusion 15 provided on the upper end surface of the upper weight portion 14 a constituting the moving body 14 moves to the electronic device main body. When colliding with the lower surface 2b, the moving body 14 can collide with a point instead of a surface. Thereby, the impact can be concentrated on one point, and the tactile feedback that gives the operator a feeling that the operation has been performed by returning the vibration to the finger or the pen when the input operation is performed can be improved.

  The form of the protrusion 15 includes the following.

  In Form 1 of the protrusion 15, the protrusion 15 has a vertex at the same height level as the end face on the upper side of the housing 3 when the movable body 14 moves above the drive shaft 9. To be exposed.

  In the illustrated embodiment, as shown in FIGS. 2 and 4, when the moving body 14 moves to the upper side of the drive shaft 9, the height level of the apex of the protrusion 15 is set to the upper side surface of the cover 4 (the drive shaft 9 The height level of the surface facing the other end side opposite to the one end is the same.

  2 and 4, the height level of the upper side surface of the cover 4 is the same as the height level of the end surface on the upper end side of the housing 3 (the surface facing the other end side opposite to one end of the drive shaft 9). It is. Therefore, the apex of the protrusion 15 can be exposed from the housing 3 at the same height level as the end surface on the upper end side of the housing 3 (the end surface of the housing 3 on the other end side).

  When the lower side surface 2b of the electronic device main body on which the linear drive device according to the first embodiment is disposed is in contact with the end surface on the upper end side of the housing 3 as shown in FIGS. As described above, since the height level of the apex of the protrusion 15 is the same as the height level of the end surface on the upper end side of the housing 3, the apex of the protrusion 15 is a point, and the lower surface of the electronic device main body Collide with 2b.

  Thus, in the linear drive device of the present embodiment, the impact can be concentrated at one point by causing the moving body 14 to collide with the lower side surface 2b of the electronic device main body at a point instead of a surface. Thereby, when an input operation is performed, it is possible to improve the tactile feedback that gives the operator a feeling that the operation has been reliably performed by returning vibration to the finger or pen.

  In the form 2 of the protrusion 15, at least the vertex of the protrusion 15 may protrude from the end face on the upper end side of the housing 3 when the moving body 14 moves to the upper side of the drive shaft 9.

  According to such a form 2 of the protrusion 15, tactile feedback that gives the operator a feeling that the operation has been reliably performed by returning vibration to the finger or pen when an input operation is performed is further improved. Can do.

  Hereinafter, an example of the operation of the linear drive device 1 according to the first embodiment will be described.

  When a driving voltage is applied to the expansion / contraction thin plate 7a of the fine vibration generating member 8, the expansion / contraction thin plate 7a extends in the thickness direction and contracts in the in-plane direction, but the elastic thin plate 6 does not expand / contract. Therefore, the fine vibration generating member 8 is deformed so that the central portion is displaced upward and the peripheral portion is displaced downward. The drive voltage waveform is a rectangular wave having a frequency of about several tens of kHz, a sawtooth wave, a triangular wave having a different rise time and fall time, or the like.

  The drive shaft 9 having one end fixed to the center of the fine vibration generating member 8 also moves upward, and the moving body 14 coupled to the drive shaft 9 also moves upward.

  When the drive voltage is suddenly lowered when the micro-vibration generating member 8 has undergone predetermined deformation, the deformation of the micro-vibration generating member 8 is rapidly restored to the original state by the elastic force of the elastic thin plate 6.

  Along with this, the drive shaft 9 also returns to the original position, but the moving body 14 cannot follow the rapid downward movement of the drive shaft 9 and remains in that position.

  As a result, the moving body 14 moves slightly upward.

  Due to this reciprocating asymmetric axial movement of the drive shaft 9, the movable body 14 moves upward by 1 to several μm per reciprocation.

  As described above, this operation is repeated at a frequency of several tens of kHz.

  Further, when the moving body 14 is moved downward, a similar drive voltage is applied to the expansion / contraction member 7b of the fine vibration generating member 8 so that the axial movement of the drive shaft 9 is reversed. In this way, the moving body 14 reciprocates on the drive shaft 9 in the axial direction of the drive shaft 9.

  When the movable body 14 moves to the upper side in the axial direction of the drive shaft 9 once or a plurality of times in this way, the lower surface 2b of the electronic device main body in which the apex of the projection 15 is in contact with the end surface on the upper end side of the housing 3. Collide with. At this time, the apex of the protrusion 15 extends from the housing 3 at the same height level as the upper surface of the cover 4 or the upper end surface of the housing 3 when the moving body 14 moves above the drive shaft 9. Exposed. Or when the moving body 14 moves to the upper side of the drive shaft 9, it has the form which protrudes from the end surface of the upper end side of the housing | casing 3 at least.

  In the first embodiment, the weight portion 14 a is connected to the support portion 11 via the plate-like body 13. Since the apex of the protrusion 15 arranged on the upper end surface of the weight portion 14a connected to the support portion 11 via the plate-like body 13 collides with the lower side surface 2b of the electronic device main body, an input operation was performed. In this case, it is possible to improve the tactile feedback that gives the operator a feeling that the operation has been reliably performed by returning the vibration to the finger or pen.

  Note that the plate-like body 13 is not a simple plate but may be a leaf spring that connects the weight portion 14a with a support arm or the like extending radially outward from the support portion 11. In that case, the apex of the protrusion 15 can collide with the lower surface 2b of the electronic device body with momentum. Thereby, when an input operation is performed, it is possible to further improve tactile feedback that gives the operator a feeling that the operation has been reliably performed by returning vibration to the finger or pen.

  The weight parts 14a and 14b have a circular or polygonal outer shape in plan view.

  By using a material having a high density such as a tungsten alloy as the weight portions 14a and 14b and increasing the mass even in the same volume, the impact when the apex of the protrusion 15 collides with the lower surface 2b of the electronic device main body is increased. I am doing so. Therefore, a member having elasticity and elastically connecting the support portion 11 and the weight portions 14a and 14b can be employed as the plate-like body 13. For example, a leaf spring can be used as the plate-like body 13 as described above.

  In the illustrated form, the weight portions 14a and 14b are respectively attached to the upper and lower surfaces of the plate-like body 13, but only the upper weight portion 14a may be provided. In the illustrated form, the weight portions 14a and 14b are respectively attached to the upper and lower surfaces of the plate-like body 13 in consideration of an increase in impact when the apex of the protrusion 15 collides with the lower surface 2b of the electronic device main body. .

  According to the first embodiment, the vertex of the protrusion 15 collides with the lower surface 2b of the electronic device main body at a point, and the impact can be concentrated on one point. Thus, in the present embodiment, the protrusions 15 are provided at three locations on the upper end surface of the weight portion 14a. However, the protrusion 15 can be provided only at one location on the upper side surface of the weight portion 14a.

  In the first embodiment, the moving body 14 is configured such that the support portion 11 and the weight portions 14 a and 14 b are separated from each other and are connected by the plate-like body 13. However, the entire moving body 14 may be formed by a plurality of divided bodies like the support portion 11, and the entire moving body may be frictionally coupled to the drive shaft 9 by tightening with an annular tightening means.

  In the first embodiment, the fine vibration generating member 8 is a plate-shaped member such as a so-called bimorph type or a unimorph type, but may be a so-called laminated type member. At that time, only the fine vibration generating member 8 may be supported by the housing 3.

(Embodiment 2)
An example of another embodiment in which the present invention can be adopted will be described with reference to FIGS.

  Constituent members that are the same as those in the first embodiment described with reference to FIGS. 1 to 8 are given the same reference numerals, and descriptions thereof are omitted.

  In the embodiment of FIGS. 9 to 11, the protrusion formed on the upper end surface of the upper weight portion 14 a constituting the moving body 14 has a flat plate shape. Therefore, when the moving body 14 including the weight portions 14a and 14b moves in the upper direction of the drive shaft 9 and collides with the lower side surface 2b of the electronic device main body, the moving body 14 collides with the surface of the flat projection 16. To do.

  In the illustrated form, flat projections 16 are formed at the four corners of the weight portion 14a. On the other hand, a cross-shaped cover 4 is provided on the upper end side of the housing 3 in plan view. For example, a double-sided tape 20 is attached to the upper side of the cover 4, and the linear drive device 1 is attached to the lower side surface 2 b of the electronic apparatus main body via the double-sided tape 20. When the upper flat surface of the flat projection 16 collides with the lower surface 2 b of the electronic device main body, the cover 4 fits into a groove formed between the four projections 16.

  Similar to the first embodiment, in the linear drive device 1 of the second embodiment, the moving body 14 reciprocates on the drive shaft 9 in the axial direction of the drive shaft 9. After the movable body 14 moves in the upper direction of the drive shaft 9 and collides with the lower side surface 2b of the main body of the electronic device, when the movable body 14 moves in the lower direction of the drive shaft 9, the lower side of the movable body 14 is 3 may collide with the bottom surface. In this case, unnecessary collision noise is generated.

  In the second embodiment, a soundproof member 21 is provided on the bottom surface of the housing 3. By providing the soundproofing member 21 on the bottom surface of the housing 3, which is the surface facing the lower end surface of the drive shaft 9 in the moving body 14 of the housing 3, it is possible to suppress the occurrence of unnecessary collision noise.

  The soundproof member 21 is provided for the purpose of suppressing a collision sound that is generated when the lower side of the moving body 14 that moves toward the lower side of the drive shaft 9 collides with the bottom surface of the housing 3. For this reason, the soundproof member 21 is disposed so as to be sandwiched between the lower surface of the moving body 14 and the bottom surface of the housing 3.

  Therefore, instead of the configuration in which the soundproof member 21 is provided on the bottom surface of the housing 3 or the soundproof member 21 is provided on the bottom surface of the housing 3, A soundproof member 21 may be provided on the lower surface of the lower weight portion 14b.

  The soundproof member 21 is sufficient if it can achieve the above-described object. For example, a sheet having a thickness of about 0.1 mm made of a synthetic resin such as polyethylene terephthalate can be employed.

  Further, in the second embodiment, the housing 3 includes a gap that communicates the inner side and the outer side of the housing 3.

  In the structure in which the inner side and the outer side of the housing 3 are not in communication, when the moving body 14 reciprocates in the axial direction of the drive shaft 9, there is no air escape path from the inside of the housing 3 to the outside. For this reason, air resistance arises with respect to the reciprocating movement of the mobile body 14. Due to this air resistance, the reciprocating speed of the moving body 14 is reduced, and the impact of the moving body 14 moving to the upper side of the drive shaft 9 and colliding with the lower side surface 2b of the electronic device main body is weakened.

  In the second embodiment, the housing 3 includes a gap that communicates the inside and the outside of the housing 3. As a result, as shown in FIG. 11, air flows between the inner side and the outer side of the housing 3 when the moving body 14 is raised and lowered. Therefore, compared to a structure in which the inner side and the outer side of the housing 3 are not communicated with each other, the air resistance generated with respect to the reciprocating movement of the moving body 14 can be reduced. For this reason, deceleration of the moving speed of the moving body 14 due to air resistance is small. Therefore, the impact when the moving body 14 collides with the lower surface 2b of the electronic device main body is increased, and when the input operation is performed, the vibration is returned to the finger or the pen so that the operator feels that the operation has been performed reliably. The tactile feedback given to the can be improved.

  In the illustrated embodiment, through holes 23 a and 23 b for venting air are provided on the bottom surface of the casing 3 as gaps that allow communication between the inner side and the outer side of the casing 3. Notches 24a, 24b, 24c, and 24d are provided. The notches 24a to 24d function as gaps that connect the inner side and the outer side of the housing 3 by combining the upper surface of the housing 3 and the lower surface 2b of the electronic device main body.

  As shown in FIG. 11A, when the moving body 14 moves upward, air flows inside and outside the housing 3 as indicated by arrows. That is, the air in the space between the upper surface of the moving body 14 and the lower side surface 2b of the electronic device main body flows smoothly out of the housing 3 through the notches 24a to 24d. In addition, air smoothly flows from the outside of the housing 3 through the through holes 23 a and 23 b between the lower surface of the moving body 14 and the bottom surface of the housing 3. Thereby, the moving body 14 can collide with the lower side surface 2b of the electronic device main body without receiving much deceleration due to air resistance.

  On the other hand, as shown in FIG. 11B, when the moving body 14 moves downward, air flows inside and outside the housing 3 as indicated by an arrow. That is, the air in the space between the lower surface of the moving body 14 and the bottom surface of the housing 3 flows smoothly out of the housing 3 through the notches 24a to 24d. Further, air smoothly flows from the outside of the housing 3 through the through holes 23a and 23b between the upper surface of the moving body 14 and the lower side surface 2b of the electronic device main body. Thereby, the moving body 14 descends without receiving a large deceleration due to air resistance. Therefore, by switching the driving voltage described in the first embodiment, the moving body 14 can perform a vertical reciprocating motion without receiving a large deceleration due to air resistance.

  As described above, when the housing 3 includes a gap that communicates the inside and the outside of the housing 3, the movable body 14 reciprocates up and down without receiving a large air resistance in the housing 3. Can be performed.

  For this reason, even when the moving body 14 moves in the lower direction of the drive shaft 9 and collides with the bottom surface of the housing 3, it collides without receiving a large air resistance.

  Therefore, in the case where the housing 3 has a structure including a gap portion that communicates the inside and the outside of the housing 3, as described above, the lower surface of the moving body 14 and the bottom surface of the housing 3 It is particularly desirable to arrange the soundproof member 21 so as to be sandwiched between the two. In this case, it is desirable to form through holes 22a and 22b for venting air in the soundproof member 21 in accordance with the positions and shapes of the through holes 23a and 23b formed on the bottom surface of the housing 3. . As a result, even when the soundproof member 21 is provided, air flows in and out of the housing 3 according to the vertical movement of the moving body 14 as shown in FIG.

  As described above, the gap between the inner side and the outer side of the housing 3 is formed on the axis of the drive shaft 9 within the housing 3 by the movable body 14 including the weight portions 14a and 14b. It is deployed for the purpose of reducing air resistance when reciprocating up and down. Therefore, as long as this object can be achieved, the gap is not limited to the above-described through holes 23a and 23b and notches 24a to 24d, and various forms and structures can be adopted.

  Further, the moving body 14 itself can be provided with a structure for reducing the air resistance. For example, a hole penetrating from the upper surface to the lower surface of the weight portions 14a and / or 14b constituting the moving body 14 is formed in the flat portion of the flat projection 16 so that the moving body 14 is vertically penetrated. A structure having a hole can be provided. In addition, an air escape groove extending from the upper surface to the lower surface in the vertical direction is formed on the outer peripheral surface of the moving body 14 formed by the weight portions 14a and / or 14b, and air is released in the vertical direction through the groove. It can also be.

  These air vent holes and air vent grooves are formed by a space between the upper surface of the moving body 14 and the lower side surface 2b of the electronic device main body, and a space between the lower surface of the moving body 14 and the bottom surface of the housing 3. The air was able to go back and forth smoothly. Thereby, the movable body 14 can be reciprocated up and down without receiving a large air resistance.

(Embodiment 3)
In the first and second embodiments shown in FIGS. 1 to 11, the lower end of the drive shaft 9 is connected to the fine vibration generating member 8, and the fine vibration generating member 8 is supported by the housing 3 only via the drive shaft 9. It has a structure.

  The third embodiment shown in FIG. 12 is an embodiment in which the fine vibration generating member 8 is fixed to the housing 3 at equal intervals in the circumferential direction at the peripheral edge. As described in the first embodiment, the fine vibration generating member 8 is formed of a thin plate including the elastic thin plate 6 and the elastic thin plates 7a and 7b arranged on at least one surface of the elastic thin plate 6, and the elastic thin plates 7a and 7b. It is deformed into a bowl shape by applying a driving voltage to.

  In the form shown in FIG. 12A, the housing 3 has a rectangular tube shape in plan view, and the fine vibration generating member 8 has a circular shape in plan view.

  The lower end portion 3 a of the cylindrical portion of the housing 3 is provided with the inner peripheral edge one step higher than the outer peripheral edge, and serves as a fixed portion 3 b of the fine vibration generating member 8.

  The fine vibration generating member 8 has a peripheral edge portion 8a fixed to a fixing portion 3b of the housing 3 at a point (small area).

  In the embodiment of FIG. 12A, the casing 3 is rectangular when viewed from below, and the fine vibration generating member 8 is circular so that the four portions of the peripheral edge 8a are slightly placed on the fixed portion 3b of the casing 3. It was.

  By forming the elastic thin plate 6 so as to protrude to the outer peripheral side of the elastic thin plates 7a and 7b, a peripheral edge portion 8a that is fixed to the fixing portion 3b of the housing 3 by a point can be formed. Of the stretchable thin plates 7a and 7b and the elastic thin plate 6, the one fixed to the fixing portion 3b of the housing 3 projects outward to form the peripheral edge portion 8a, thereby facilitating electrical wiring.

  Since the fine vibration generating member 8 is directly fixed to the housing 3, stable driving by the fine vibration generating member 8 is obtained. Further, since the peripheral portion 8a is fixed not at the whole point but at a point, the amount of fine vibration generated by the fine vibration generating member 8 is not absorbed by the housing 3 or the deformation is hindered. The driving capability by the member 8 is large. Further, the weight parts 14a and 14b heavier than those in the first embodiment can be moved.

  The lower end portion 3a is a fixed portion 3b provided with the inner peripheral edge one step higher than the outer peripheral edge. Therefore, by making the step of the fixing portion 3b deeper than the thickness of the fine vibration generating member 8, the fine vibration generating member 8 is surrounded by the housing 3 without protruding from the lower end portion 3a of the housing 3. Thereby, during the assembly of the linear drive device 1, the fine vibration generating member 8 is not easily destroyed by an external force after the assembly.

  There are other combinations of the shapes of the housing 3 and the fine vibration generating member 8 of the present embodiment.

  For example, in FIG. 12B, the casing 3 has a circular shape and the minute vibration generating member 8 has a quadrangular shape, contrary to FIG.

  In FIG. 12C, both the housing 3 and the minute vibration generating member 8 are square. In this case, the peripheral edge 8 a of the square corner of the fine vibration generating member 8 is placed on the fixed part 3 b of the square side of the housing 3.

  In FIG. 12D, the housing 3 is octagonal and the micro-vibration member 8 is square.

  This shape may be considered as a shape in which the corners of the rectangular casing 3 in FIG. Therefore, the housing 3 may not be an octagon but a rounded rectangle.

  In FIG. 12E, the fine vibration generating member 8 in FIG. 12D has a circular shape.

  FIG. 12 (f) shows that the fine vibration generating member 8 has a hexagonal shape instead of a circular or square shape. Such a shape may be used.

  In this way, the housing 3 and the fine vibration generating member 8 can be combined in various shapes.

  The embodiment in which the fine vibration generating member 8 shown in the third embodiment is fixed to the housing 3 at equal intervals in the circumferential direction with respect to the peripheral portion is the upper end surface (drive) of the moving body 14. The present invention is not only applied to the configuration in which the protrusion 15 is provided on the surface facing the other end side opposite to the one end of the shaft 9.

  For example, the present invention can be applied without any problem to a configuration in which the protrusion 15 is not provided on the upper end surface of the moving body 14. As the moving body 14 having such a configuration, for example, there is a lens support body on which a lens can be mounted. In this case, the linear drive device functions as a lens drive device.

(Embodiment 4)
In the above-described embodiment, only the mode in which the protrusion 15 collides with the lower side surface 2b of the electronic device main body is described. In the following third embodiment, by controlling the drive voltage applied to the fine vibration generating member 8, the projection 15 that is the first mode collides with the lower surface 2 b of the electronic device main body, and the second mode. In this mode, it is possible to switch between the mode in which the drive shaft 9 is moved up and down in the axial direction without the projection 15 colliding with the lower surface 2b of the electronic device main body.

  FIG. 13 illustrates an example of the time change of the position of the moving body 14 in these two modes.

  In the first mode, when the driving voltage is applied, the moving body 14 moves upward from the reference position along the driving shaft 9 (A), and the apex of the protrusion 15 collides with the lower side surface 2b of the electronic device main body. (B). In order to ensure collision, the driving voltage is applied as it is even after the collision, so that the moving body 14 tries to rise further (C). However, since the moving body 14 still collides with the lower side surface 2b of the electronic device body, it remains as it is. Keep the position of (D).

  After the apex of the protrusion 15 collides with the lower surface 2b of the electronic device body, the moving body 14 is applied by changing the driving voltage waveform and applying the driving voltage so that the axial movement of the driving shaft 9 is reversed. Moves downward in the axial direction of the drive shaft 9 (E) and returns to the reference position. In order to surely return to the reference position, the drive voltage is applied as it is even after the moving body 14 returns to the reference position, so that the moving body 14 further lowers (F), but the moving body 14 is moved from the reference position. It does n’t move. Since the moving body 14 moves over a relatively long distance, the time (T1) required for one operation is relatively long.

  On the other hand, in the second mode, the drive shaft 9 can be moved up and down in the axial direction without the protrusion 15 colliding with the lower side surface 2b of the electronic device body.

  In this embodiment, when the moving body 14 moves from the reference position to the upper side of the drive shaft 9 (G), the drive voltage waveform is generated before the apex of the protrusion 15 collides with the lower side surface 2b of the electronic device body (H). It switches so that the moving body 14 may move below (I). Further, the drive voltage waveform is switched so that the moving body 14 moves upward (J). After repeating (I) and (J), the moving body 14 is returned to the reference position (K).

  The moving body 14 is a region where the apex of the protrusion 15 does not reach the same height level as the end face on the upper end side of the housing 3, and does not collide with the lower side surface 2 b of the electronic device main body, with a short period (T 2). The vibration is generated by reciprocating in the axial direction of the drive shaft 9. This vibration is transmitted from the housing 3 to the electronic device main body.

  The time required for (G) and the time required for (K) are the time required for (I) so that the moving body 14 can continue to vibrate without colliding with the housing 3 at the lower surface 2b and the reference position of the electronic device main body. And it may be longer than the time required for (J).

  In the first mode, for example, when the linear drive device 1 is mounted on an electronic device and an operator inputs information by pressing with a finger or a pen, the vibration is returned to the finger or the pen and the operation is performed reliably. It is used to give the operator a feel.

  The second mode is used, for example, to transmit incoming information of the electronic device to the owner by vibration.

  As described above, the linear drive device 1 according to the fourth embodiment controls the drive voltage applied to the fine vibration generating member 8 so that the protrusion 15 serving as the first mode is formed on the lower surface 2b of the electronic device main body. And a mode in which the driving shaft 9 is moved up and down in the axial direction without the projection 15 being the second mode colliding with the lower surface 2b of the electronic device main body. That is, if the switching cycle for moving the moving body 14 up and down in the axial direction of the drive shaft 9 is a long cycle (T1), the first mode can be realized, and if the switching cycle is a short cycle (T2), the second mode can be realized. .

  The electronic device including the linear drive device described in the above-described embodiments is not limited to an electronic device such as an electronic device in which a touch panel function is incorporated in a display device or an input device using operation keys. For example, it may be built in a touch pen for inputting to the touch panel, or may be built in a wristwatch.

  Moreover, you may incorporate not only in an electronic device but in body-wearing goods, such as a ring, a broach, and a bandana.

  Even if it is incorporated in any of the above-described electronic devices and body-worn products, the protrusions provided on the moving body 14 collide with the electronic device body and the body-worn product body. Thereby, when an input operation is performed, it is possible to improve the tactile feedback that gives the operator a feeling that the operation has been reliably performed by returning vibration to the finger or pen. Further, when the apex of the protrusion 15 collides with the electronic device main body or the body-worn product main body, the impact when the mobile body 14 collides with the electronic device main body or the body-worn product main body can be concentrated at one point. it can. Thereby, tactile feedback can be further improved.

DESCRIPTION OF SYMBOLS 1 Linear drive device 2 Upper side 2a of electronic device main body Section 2b of electronic device main body Lower side surface 3 of electronic device main body 4 Cover 5, 10 Bush 6 Elastic thin plate 7a, 7b Elastic thin plate 8 Micro vibration generating member 9 Drive shaft 11 Support part 14 Moving body 14a, 14b Weight part 12 Tightening means 13 Plate-like body 15, 16 Protrusion part 21 Soundproof member 22a, 22b Through hole 23a, 23b Through hole 24a, 24b, 24c, 24d Notch

Claims (6)

A drive shaft that is axially displaced;
A fine vibration generating member connected to one end of the drive shaft and causing the drive shaft to move in the axial direction;
A housing that supports the drive shaft such that the drive shaft is displaceable in the axial direction;
A movable body coupled to the drive shaft so as to be movable in the axial direction of the drive shaft by displacement of the drive shaft in the axial direction;
The fine vibration generating member is formed of a thin plate having an elastic thin plate and an outer shape corresponding to the elastic thin plate, and includes an elastic thin plate arranged on at least one surface of the elastic thin plate, and a driving voltage is applied to the elastic thin plate. Is transformed into a bowl shape by applying
One end of the drive shaft is connected to the center of the fine vibration generating member,
The linear drive device according to claim 1, wherein the fine vibration generating member is fixed to the housing at a peripheral edge at equal intervals in a circumferential direction.   The linear drive device according to claim 1, wherein the fine vibration generating member is fixed to a side portion of the casing having a polygonal shape in plan view.   The linear drive device according to claim 1, wherein the fine vibration generating member has a polygonal apex portion fixed to the housing in plan view.   The casing has a cylindrical shape, and is provided with a fixing portion that is stepped by denting the inner peripheral edge rather than the cylindrical outer peripheral edge, and the fine vibration generating member is fixed to the fixing portion. The linear drive device according to claim 1.   An electronic apparatus comprising the linear drive device according to any one of claims 1 to 4.     A body-worn product comprising the linear drive device according to any one of claims 1 to 4.

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