JP5689638B2 - Actuator and lead wire wiring method - Google Patents

Description

  The present invention relates to an actuator that vibrates a piezoelectric element by applying a voltage to the piezoelectric element via a lead wire and a lead wire wiring method.

  In an actuator provided with a piezoelectric element, vibration of expansion and contraction generated by repeatedly applying a pulse voltage to the piezoelectric element (piezoelectric vibrator) is used as a power source. And in order to supply a voltage to a piezoelectric element, connection (wiring) of a lead wire is required.

  Here, an example of the connection form of the lead wire related to the present invention is shown in FIG. In the example of FIG. 3, a lead wire having one end soldered to an FPC (Flexible Printed Circuit) is connected to the piezoelectric element by soldering. This lead wire is connected in a suspended state (aerial wiring) between the piezoelectric element and the FPC, and is formed into a curved (having slack) shape and connected. The reason for adopting such a connection form is to prevent external force from being applied to the piezoelectric element and to avoid contact with peripheral components. Such a connection form of the lead wires is also disclosed in, for example, Patent Document 1.

  Note that the configuration shown in FIG. 3 is an example of an actuator that corrects aberrations of a lens built in a Blu-ray disc drive. In FIG. 3, a weight 8 provided at one end of the piezoelectric element 1 is bonded and fixed on the frame 2 with an elastic adhesive (not shown). When a voltage is applied to the piezoelectric element 1 via the lead wire 4, the piezoelectric element 2 vibrates in the direction indicated by the arrow a. This vibration is transmitted to the shaft 9 provided at the other end of the piezoelectric element 1. Since the shaft 9 is connected to the lens holding member 10 that holds the lens 11, the vibration of the piezoelectric element 1 is transmitted to the lens holding member 10. Thereby, the lens holding member 10 vibrates in the same direction as the vibration direction (arrow a) of the piezoelectric element 1.

JP 2003-1191 A

However, the connection form of the lead wire shown in FIG. 3 has the following problems.
(1) Since the aerial wiring while bending the lead wire is performed manually by an operator, the number of man-hours and the work time increase.
(2) The curved shape of the lead wire causes the quality to vary because the worker forms it manually by hand.
(3) Since the aerial wiring while curving the lead wire requires an appropriate distance between the piezoelectric element and the FPC, the wiring space increases.

  The present invention has been made in view of the above circumstances, and by solving the problems (1) to (3) regarding the wiring of the lead wire to the piezoelectric element, the efficiency of the wiring work and the stabilization of the quality are achieved. An object of the present invention is to provide an actuator and a lead wire wiring method capable of simplifying the wiring structure.

  In order to achieve such an object, a first aspect of the present invention is an actuator in which a lead wire is connected to a piezoelectric element, and the piezoelectric element vibrates due to a voltage applied via the lead wire. The piezoelectric element is connected in a linear shape in a direction orthogonal to the vibration direction of the piezoelectric element.

  A second aspect of the present invention is a lead wire wiring method for connecting a lead wire to a piezoelectric element, wherein the lead wire has a linear shape in a direction orthogonal to the vibration direction of the piezoelectric element. It is characterized by connecting to.

  According to the present invention, it is possible to realize the efficiency of wiring work, the stabilization of quality, and the simplification of the wiring structure for the wiring of the lead wire to the piezoelectric element.

It is an external appearance perspective view which shows an example of the connection form of the lead wire with respect to the piezoelectric element which concerns on one Embodiment of this invention. It is a side view which shows the example of a transition of the connection method of the lead wire with respect to the piezoelectric element which concerns on one Embodiment of this invention. It is an external appearance perspective view which shows an example of the connection form of the lead wire with respect to the piezoelectric element relevant to this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments (embodiments) for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  First, features of the present embodiment will be described. In the present embodiment, in the configuration in which the lead wire is connected to the piezoelectric element, the lead wire is kept straight and wired so as to be orthogonal to the vibration direction of the piezoelectric element without performing the wiring by bending the lead wire. For this purpose, an opening (hole) is provided in the frame for holding the piezoelectric element, and the FPC is disposed outside the opening. Then, the lead wire is inserted into the linear shape through the opening so as to be orthogonal to the vibration direction of the piezoelectric element, and is connected to the piezoelectric element. With this configuration, the lead wire can be connected in a straight line and the shortest distance between the piezoelectric element and the FPC. It should be noted that the opening formed in the frame has a sufficient dimension so that its inner surface does not contact the lead wire. Hereinafter, the features of this embodiment will be specifically described.

  FIG. 1 is a diagram illustrating a configuration in the vicinity of a piezoelectric element in the actuator of the present embodiment. The configuration other than the configuration shown in FIG. 1 is the same as the configuration shown in FIG. 3 (the description is omitted because it has been described above). Therefore, in the present embodiment, an actuator that corrects aberration of a lens built in a Blu-ray disc drive will be described as an example, but the present invention is not limited to this.

  In FIG. 1, the piezoelectric element 1 has a weight 8 at one end and a shaft 9 at the other end. The weight 8 is bonded and fixed to the upper surface of the frame 2 with an elastic adhesive (not shown). A frame 2 is disposed below the piezoelectric element 1. The frame 2 is provided with two openings 7 below the left and right side surfaces of the piezoelectric element 1. The lead wire 4 is inserted in a straight line shape through two openings 7 and is soldered to the left and right side surfaces of the piezoelectric element 1 with solder 6. Although not shown in FIG. 1, an FPC is disposed on the bottom surface of the frame 2, and the lead wire 4 is soldered to the FPC. In such a configuration, when a voltage is applied to the piezoelectric element 1 via the lead wire 4, the piezoelectric element 1 vibrates in the direction indicated by the arrow a. This vibration is transmitted to a lens holding member (not shown) through the shaft 9.

  Next, a lead wire wiring method in the actuator of the present embodiment will be described with reference to FIG. FIG. 2 is a side view of the piezoelectric element 1 shown in FIG. 1 viewed from the right direction.

  First, FIG. 2A will be described. A frame 2 is disposed below the piezoelectric element 1. The weight 8 and the upper surface of the frame 2 are bonded and fixed by an elastic adhesive 12. An opening 7 is formed in the frame 2. The diameter of the opening 7 (the length indicated by the arrow b) is such that the lead wire 4 does not contact the surface (inner surface) of the opening 7 when the piezoelectric element 1 vibrates (for example, from 0.8 mm to 0.8 mm). 1.0 mm). An FPC 3 is bonded to the bottom surface of the frame 2. An opening 13 is formed in the FPC 3 at a position corresponding to the opening 7. The diameter of the opening 13 may be any size as long as the lead wire 4 can be inserted and soldered easily. In the example of FIG. 2A, the diameter of the opening 13 is smaller (shorter) than the diameter of the opening 7. The lead wire 4 is inserted into the opening 13 and the opening 7 from the bottom surface side of the frame 2 in a straight line shape in the direction indicated by the arrow c. The direction indicated by the arrow c is a direction orthogonal to the vibration direction of the piezoelectric element 1 (the direction indicated by the arrow a).

  Next, FIG. 2B will be described. FIG. 2B shows the state after the state of FIG. The lead wire 4 is inserted through the opening 13 and the opening 7 so as to come into contact with the right side surface of the piezoelectric element 1, and is soldered by the solder 6 on the right side surface of the piezoelectric element 1. The lead wire 4 is soldered by the solder 5 in the opening 13 of the FPC 3.

  Next, FIG. 2C will be described. FIG. 2 (c) shows the state after the state of FIG. 2 (b). The lead wire 4 is cut at each of the soldered portions. Thus, the wiring of the lead wire in the actuator of this embodiment is completed, and the configuration shown in FIG. 1 is completed.

  As described above, according to the present embodiment, the wiring of the lead wire to the piezoelectric element can be wired in a straight line shape without bending the lead wire. Therefore, wiring by machine is possible without the need for manual wiring, and the efficiency of wiring work (reduction of man-hours and work time for wiring) and stabilization of the quality (prevention of wiring variations) can be realized. In addition, since the wiring structure can be simplified (reduction of wiring space), it can contribute to the downsizing of the apparatus. Further, in the configuration shown in FIG. 3, since the lead wire is wired in the same direction as the vibration direction of the piezoelectric element, the vibration of the piezoelectric element is restricted, but in this embodiment, it is orthogonal to the vibration direction of the piezoelectric element. Since the lead wire is wired in the direction, there is no restriction on the vibration of the piezoelectric element.

  As mentioned above, although embodiment of this invention was described, it is not limited to the said embodiment, A various deformation | transformation is possible in the range which does not deviate from the summary.

1 Piezoelectric element 2 Frame 3 FPC
4 Lead wire 5, 6 Solder 7, 13 Opening 8 Weight 9 Shaft 10 Lens holding member 11 Lens 12 Elastic adhesive

Claims (4)

An actuator in which a lead wire is connected to the piezoelectric element, and the piezoelectric element vibrates by a voltage applied via the lead wire;
A frame disposed below the piezoelectric element and to which a part of the piezoelectric element is fixed;
A substrate disposed below the frame,
Each of the frame and the substrate has an opening.
The lead wire is
It is connected to the piezoelectric element in a linear shape in a direction orthogonal to the vibration direction of the piezoelectric element through the opening formed in the frame and the opening formed in the substrate. Actuator to do. The opening formed in the frame is
The actuator of claim 1, wherein the piezoelectric element is characterized by having a diameter which the lead wire is not in contact with the surface of the opening when the vibrating. The lead wire is
The actuator according to claim 1 , wherein the actuator is soldered in an opening formed in the piezoelectric element and the substrate. A lead wire wiring method for connecting a lead wire to a piezoelectric element,
An opening is formed in each of a frame disposed below the piezoelectric element and to which a part of the piezoelectric element is fixed, and a substrate disposed below the frame,
The lead wire,
A lead that passes through an opening formed in the frame and an opening formed in the substrate and is connected to the piezoelectric element in a linear shape in a direction orthogonal to a vibration direction of the piezoelectric element. Wire wiring method.

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