JP6311464B2 - Tactile presentation device - Google Patents

Description

  The present invention relates to a haptic presentation device that provides haptic feedback by transmitting vibration to a user.

  In recent years, a touch-sensitive keyboard or the like has been proposed in which a tactile feedback is given by transmitting vibration when a user touches a key to feel the key “pressed”.

  For example, Patent Document 1 describes a structure in which both ends of a piezoelectric bimorph element made of piezoelectric ceramics or the like are held by a low elastic body, and a vibrating material is connected to the center of the piezoelectric bimorph. In the structure of Patent Document 1, vibration is transmitted to a user through a connected vibration-receiving material by inputting an AC signal to the piezoelectric bimorph element and causing it to vibrate.

JP 2005-303937 A

  However, there is a problem that piezoelectric ceramics are easily broken. On the other hand, a material that is difficult to break, such as a piezoelectric film, has a weak force to transmit vibration and is difficult to use for a tactile sense presentation device.

  Accordingly, an object of the present invention is to provide a tactile sensation presentation apparatus that can transmit a strong vibration to some extent even when a piezoelectric film is used.

In the tactile sense presentation device according to the present invention, a piezoelectric film constituted by sandwiching both main surfaces of a plate-like piezoelectric resin between a first electrode and a second electrode , and a planar tension is applied to the piezoelectric film. A vibration plate fixed in a bent state, and provided on the opposite side of the piezoelectric film along the vibration plate with a gap between the vibration plate and having a touch operation reception area, A touch operation receiving plate having a hole penetrating in the thickness direction, a protrusion provided at the position of the diaphragm facing the hole, and a touch operation to the receiving area are detected. A touch detection unit and a drive unit that applies a drive signal to the piezoelectric film when the touch detection unit detects a touch operation.

  In this configuration, when the user performs a touch operation, a drive signal is applied to the piezoelectric film, and the piezoelectric film expands and contracts. When the piezoelectric film expands and contracts, the diaphragm vibrates in the direction orthogonal to the main surface due to the expansion and contraction. Since the bending stress is generated in the diaphragm, it can be efficiently vibrated with respect to expansion and contraction of the piezoelectric film. As the diaphragm vibrates, the protrusion reciprocates along the thickness direction of the hole of the touch operation reception plate, and the protrusion touches the user's finger touching the reception area. On the other hand, vibration is given. At this time, since the user does not touch the diaphragm directly, the vibration of the diaphragm is not hindered. Therefore, it is possible to efficiently transmit strong vibration to the user.

  In the present invention, the touch operation receiving plate includes a plurality of the receiving regions, the holes are formed in each of the plurality of receiving regions, and the protruding portion is formed on the diaphragm with respect to each of the plurality of holes. It is preferable to be provided.

  In this configuration, it is possible to efficiently transmit vibration to the user regardless of which touch operation reception area is touched.

  According to the present invention,

1 is an external perspective view of a tactile sense presentation device according to Embodiment 1. FIG. (A) is a plan view of the tactile sense presentation device, (B) is a side view. Sectional view taken along line III-III in FIG. Partial enlarged view of piezoelectric film The figure which expressed each function with which a tactile sense presentation device is provided with a block Operation explanatory diagram of tactile presentation device The figure which shows a state when the protrusion part of a diaphragm reciprocates the hole of a guide plate External appearance perspective view of the tactile presentation device according to Embodiment 2 Sectional view taken along line IV-IV in FIG.

(Embodiment 1)
FIG. 1 is an external perspective view of a haptic presentation device 10 according to the first embodiment. 2A is a plan view of the tactile sense presentation device 10, and FIG. 2B is a side view. FIG. 3 is a cross-sectional view taken along line III-III in FIG. The tactile sense presentation device 10 according to the present embodiment is a so-called keyboard.

  The tactile sense presentation device 10 includes a piezoelectric film 11, a diaphragm 12, and a guide plate 13.

  The diaphragm 12 has a rectangular shape in plan view. The diaphragm 12 has a shape in which each long side is fixed to the long side of the piezoelectric film 11 and is curved and protrudes on the opposite side to the piezoelectric film 11. The piezoelectric film 11 is in a state in which a tensile force is applied in a direction along the short side of the piezoelectric film 11 (hereinafter referred to as a short direction) by fixing the diaphragm 12. Since the vibration plate 12 is curved, a hollow region 100 is formed between the piezoelectric film 11 and the vibration plate 12.

  As a bonding method between the piezoelectric film 11 and the diaphragm 12, both ends of the diaphragm 12 and both ends of the piezoelectric film 11 may be bonded with an adhesive, or the piezoelectric film 11 and the diaphragm 12 are clipped. It may be attached by being sandwiched between them.

  Hereinafter, the side on which the piezoelectric film 11 exists is referred to as the diaphragm 12 and the back side of the tactile presentation device 10, and the opposite side is referred to as the front side of the diaphragm 12 and the tactile presentation device 10.

  FIG. 4 is a partially enlarged view of the piezoelectric film 11. The piezoelectric film 11 is formed by forming electrodes 11A and 11B on both main surfaces of a base film 11C made of piezoelectric resin. The electrodes 11A and 11B are preferably composed mainly of indium tin oxide (ITO), zinc oxide (ZnO), and polythiophene. In addition, it is also possible to use a silver nanowire electrode for the electrode 11A and the electrode 11B, and it is preferable to use an aluminum vapor deposition electrode. A wiring (not shown) is connected to the electrode 11A and the electrode 11B, and a drive signal is applied to the electrode 11A and the electrode 11B via the wiring.

  The base film 11C of the piezoelectric film 11 partially includes a resin of a piezoelectric material such as polyvinylidene fluoride (PVDF) or a chiral polymer. More preferably, the base film 11C is made of polylactic acid (PLA) having high translucency or PLLA that has been uniaxially stretched.

  The base film 11C of the piezoelectric film 11 expands and contracts in the lateral direction when a drive signal is applied to the electrodes 11A and 11B on both main surfaces. In order to prepare the base film 11C that expands and contracts in the short direction, for example, when the material is PLLA, the base film 11C is cut so that the direction that forms an angle of about 45 ° with respect to the stretching direction is the short direction.

  Since the vibration plate 12 is fixed to the piezoelectric film 11 in a state where the flat plate surface is curved, the vibration plate 12 is fixed to the piezoelectric film 11 in a state where bending stress is applied as indicated by the white arrow F901 in FIG. In addition, the piezoelectric film 11 is in a state in which a tensile force is applied in the short-side direction on the main surface of the piezoelectric film 11 as indicated by a white arrow S901 in FIG.

  The guide plate 13 corresponds to a “touch operation receiving plate” according to the present invention. The guide plate 13 is on the front side of the diaphragm 12 and is fixed to the diaphragm 12 in a curved state in the same manner as the diaphragm 12. Each of the long sides of the guide plate 13 is fixed to each of the long sides of the diaphragm 12 by the support member 14 so that a gap is formed between the guide plate 13 and the diaphragm 12. The guide plate 13 has higher rigidity than the diaphragm 12, and the front surface is an operation surface that receives a user's touch operation.

  A plurality of keys 13 </ b> A are arranged on the surface of the guide plate 13. The plurality of keys 13A are printed on the surface of the guide plate 13, for example. A touch sensor 13S for detecting a touch operation on the key 13A is provided on the surface of the key 13A. The key 13A corresponds to a “reception area” according to the present invention, and the touch sensor 13S corresponds to a “touch detection unit” according to the present invention. The touch sensor 13S may be of any type as long as it has a function of detecting a user's touch operation, and various types such as a membrane type, a capacitance type, and a piezoelectric film type can be used. The touch sensor 13S may be provided on the back surface of the key 13A.

  A hole 13H is formed in the region where the key 13A is formed. At the position of the diaphragm 12 facing the hole 13H, a protruding portion 12A protruding to the front side is provided. For example, the protruding portion 12 </ b> A may be formed by forming a hole in the diaphragm 12 and fixing the hole to the hole, or may be formed integrally with the diaphragm 12. The protruding portion 12A has a cylindrical shape, and its diameter is smaller than that of the hole 13H. And 12 A of protrusion parts will be in the state inserted in the hole 13H.

  As will be described later, the protrusion 12A is a member for transmitting the vibration of the diaphragm 12 to the user's finger touching the key 13A. The protruding portion 12A only needs to be high enough to touch the user's finger touching the key 13A. For example, the protrusion 12 </ b> A may have a height such that the end of the protrusion 12 </ b> A is flush with the surface of the guide plate 13 or protrudes when the vibration plate 12 vibrates. Further, considering that a part of the user's finger touching the key 13A enters the hole 13H, the protruding portion 12A has a height at which the end portion is located slightly inside the surface of the guide plate 13. May be.

  Further, the gap formed between the diaphragm 12 and the guide plate 13 only needs to have a distance that does not hinder the vibration of the diaphragm 12. The diaphragm 12 vibrates in the front direction and the back direction during vibration. At this time, if the diaphragm 12 that vibrates to the front side contacts the guide plate 13, the vibration of the diaphragm 12 is damaged. Accordingly, in consideration of the vibration range of the diaphragm 12, a gap may be provided between the guide plate 13 and the diaphragm 12. Even if the user touches the guide plate 13 with this gap, the vibration of the diaphragm 12 is not hindered.

  FIG. 5 is a block diagram showing each function provided in the tactile sense presentation device 10. The tactile presentation device 10 includes a control unit 15. The control unit 15 is, for example, a microcomputer on a circuit board (not shown) provided at a desired position of the tactile sense presentation device 10. The control unit 15 realizes the functions of the operation determination unit 151 and the drive unit 152.

  The operation determination unit 151 acquires output signals from the plurality of touch sensors 13S and determines whether or not a touch operation by the user has been performed. When the operation determination unit 151 detects a touch operation, the operation determination unit 151 notifies the drive unit 152 of the operation detection. The drive unit 152 applies an AC voltage to the electrodes 11A and 11B of the piezoelectric film 11 as a drive signal. When an AC voltage is applied to the electrodes 11A and 11B, an electric field is applied in the thickness direction of the piezoelectric film 11, and the piezoelectric film 11 vibrates.

  FIG. 6 is an explanatory diagram of the operation of the tactile sense presentation device 10, and FIG. 6 (A) shows a state at a timing when the piezoelectric film 11 is contracted by a drive signal. FIG. 6B shows a state where no drive signal is applied or the amplitude of the drive signal is zero. FIG. 6C shows a state at the timing when the piezoelectric film 11 is extended by the drive signal.

  When the drive unit 152 applies a drive signal to the piezoelectric film 11 and applies an electric field in one direction of the thickness of the piezoelectric film 11, the piezoelectric film 11 has a diaphragm as shown by an arrow S 911 in FIG. Shrink along 12 short directions. At this time, the piezoelectric film 11 is slightly curved toward the front side in the normal direction of the main surface. Then, the diaphragm 12 is pulled in the central direction from the portion fixed to the piezoelectric film 11. Thereby, the diaphragm 12 is curved so as to protrude further forward as indicated by an arrow F911 in FIG.

  On the other hand, when the drive unit 152 applies a drive signal to the piezoelectric film 11 and applies an electric field in a direction opposite to the one direction in the thickness direction, as shown by an arrow S912 in FIG. Extends along a direction orthogonal to the fixed end of the diaphragm 12. At this time, the piezoelectric film 11 is slightly curved toward the back side in the normal direction of the main surface. And the diaphragm 12 is pulled by the location currently fixed to the piezoelectric film 11 from the center direction. As a result, the diaphragm 12 is in a curved state in which the forward protrusion amount is reduced as indicated by an arrow F912 in FIG.

  Therefore, the diaphragm 12 changes to the state shown in FIG. 6A and the state shown in FIG. 6C based on the state shown in FIG. Vibrates along the direction. Since the guide plate 13 has higher rigidity than the diaphragm 12, even if the diaphragm 12 vibrates, the guide plate 13 does not substantially vibrate. Therefore, the protruding portion 12 </ b> A that vibrates with the vibration of the vibration plate 12 reciprocates along the thickness direction of the guide plate 13 in the hole 13 </ b> H of the guide plate 13.

  FIG. 7 is a diagram illustrating a state when the protruding portion 12 </ b> A of the diaphragm 12 reciprocates through the hole 13 </ b> H of the guide plate 13. When the protrusion 12A reciprocates inside the hole 13H, the end of the protrusion 12A comes into contact with the finger 90 of the user who is touching the key 13A, and gives a repulsive feeling to the finger 90. Due to this repulsion, the vibration of the diaphragm 12 is transmitted to the user's finger 90. Therefore, when the user touches the key 13A of the guide plate 13, the vibration is fed back, so that the user can feel that the key is “pressed”.

  As described above, in the present embodiment, the vibration plate 12 is not directly touched by the user, and thus vibration is not inhibited. And the strong vibration can be efficiently transmitted with respect to a user by transmitting the vibration of the diaphragm 12 to a user's finger | toe via 12 A of protrusion parts.

(Embodiment 2)
FIG. 8 is an external perspective view of the tactile presentation device 20 according to the second embodiment. 9 is a cross-sectional view taken along line IV-IV in FIG.

  The tactile sense presentation device 20 includes a piezoelectric film 21 and a diaphragm 22 as in the first embodiment. The piezoelectric film 21 and the diaphragm 22 are the same as those of the first embodiment, and the diaphragm 22 has a central portion in the short direction projecting downward on the lower surface side so that a hollow region 200 is formed therebetween. The piezoelectric film 21 is bonded in a curved state. The piezoelectric film 21 and the diaphragm 22 support the lower surface of the diaphragm 22 with a support member 24 in the short direction so that the lower surface of the diaphragm 22 does not contact, for example, the mounting table. As a result, the diaphragm 22 is subjected to bending stress at both ends as indicated by the white arrow F902 in FIG. Due to this bending stress, the piezoelectric film 21 is pulled at both ends from the center in the short direction, as indicated by the white arrow S902 in FIG.

  The tactile sense presentation device 20 includes a guide plate 23. The guide plate 23 corresponds to a “touch operation receiving plate” according to the present invention. The guide plate 23 is provided on the opposite side of the piezoelectric film 21 from the diaphragm 22 (hereinafter referred to as the upper surface side) so that a gap 201 is formed between the guide plate 23 and the piezoelectric film 21.

  On the surface of the guide plate 23, a plurality of keys 23A (corresponding to a receiving area according to the present invention) are arranged. The plurality of keys 23A are printed on the surface of the guide plate 23, for example. A touch sensor 23S (corresponding to a touch detection unit according to the present invention) that detects a touch operation on the key 23A is provided on the surface of the key 23A. A hole 23H is formed in the region where the key 23A is formed.

  At the position of the piezoelectric film 21 facing the hole 23H, a protruding portion 21A protruding to the upper surface side is provided. The protruding portion 21A is formed by, for example, forming a hole in the piezoelectric film 21 and fixing the hole. The protruding portion 21A has a cylindrical shape, and its diameter is smaller than that of the hole 23H. The protruding portion 21A is partially inserted into the hole 23H.

  The vibration modes of the piezoelectric film 21 and the diaphragm 22 are the same as in the first embodiment. That is, when the key 23A is touched, the drive unit described in FIG. 5 applies an AC voltage to the electrode of the piezoelectric film 21, and the piezoelectric film 21 repeats expansion and contraction in the short direction in synchronization with the period of the AC voltage. . When the piezoelectric film 21 contracts in the lateral direction, the distance between both ends in the lateral direction of the diaphragm 22 is shortened. Then, the amount of protrusion of the diaphragm 22 to the lower surface of the central portion in the short direction increases. When the piezoelectric film 21 extends in the lateral direction, the diaphragm 22 has a longer distance between both ends in the lateral direction. Thereby, the amount of protrusion of the diaphragm 22 to the lower surface of the central portion in the short direction is reduced. Thus, the diaphragm 22 vibrates along the height direction of the tactile presentation device 20.

  As the piezoelectric film 21 and the vibration plate 22 vibrate, the protruding portion 21 </ b> A provided on the piezoelectric film 21 moves in the hole 23 </ b> H of the guide plate 23. Since the user's finger touching the key 23A touches the protruding portion 21A, vibration is fed back to the user, so that the user can feel that the key 23A has been “pressed”. At this time, since the gap 101 is formed between the guide plate 51 and the piezoelectric film 21, even if the user touches the guide plate 23, the vibration of the piezoelectric film 21 is not hindered. Therefore, it is possible to efficiently transmit strong vibration to the user.

DESCRIPTION OF SYMBOLS 10 ... Tactile sense presentation apparatus 11 ... Piezoelectric film 11A, 11B ... Electrode 11C ... Base film 12 ... Vibration plate 12A ... Projection part 13 ... Guide plate 13A ... Key 13H ... Hole 13S ... Touch sensor 14 ... Support member 15 ... Control part 20 ... Tactile sense presentation device 21 ... piezoelectric film 21A ... projection 22 ... vibrating plate 23 ... guide plate 23A ... key 23H ... hole 23S ... touch sensor 24 ... support member 51 ... guide plate 90 ... finger 100 ... hollow region 101 ... gap 151 ... operation Determination unit 152 ... driving unit 200 ... hollow region 201 ... gap

Claims (4)

A piezoelectric film configured by sandwiching both main surfaces of a plate-like piezoelectric resin between a first electrode and a second electrode;
A diaphragm fixed in a bent state so as to apply a planar tension to the piezoelectric film;
A touch provided on the opposite side of the piezoelectric film along the diaphragm with a gap from the diaphragm, having a touch operation receiving area, and a hole penetrating in the thickness direction is formed in the receiving area. An operation reception board;
A protrusion provided at a position of the diaphragm facing the hole, and inserted into the hole;
A touch detection unit for detecting a touch operation to the reception area;
A drive unit that applies a drive signal to the piezoelectric film when the touch detection unit detects a touch operation;
A tactile presentation device. The touch operation reception board has a plurality of the reception areas,
The holes are formed in each of the plurality of reception areas,
The protrusion is provided on the diaphragm with respect to each of the plurality of holes.
The tactile sense presentation device according to claim 1. A piezoelectric film configured by sandwiching both main surfaces of a plate-like piezoelectric resin between a first electrode and a second electrode;
A diaphragm fixed in a bent state so as to apply a planar tension to the piezoelectric film;
A touch provided on the opposite side of the diaphragm along the piezoelectric film with a gap from the piezoelectric film, having a touch operation receiving area, and a hole penetrating in the thickness direction is formed in the receiving area. An operation reception board;
A protrusion provided at a position of the piezoelectric film facing the hole, and inserted into the hole;
A touch detection unit for detecting a touch operation to the reception area;
A drive unit that applies a drive signal to the piezoelectric film when the touch detection unit detects a touch operation;
A tactile presentation device. The touch operation reception board has a plurality of the reception areas,
The holes are formed in each of the plurality of reception areas,
The protrusion is provided on the piezoelectric film for each of the plurality of holes.
The tactile sense presentation device according to claim 3.

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