JP2601136Y2 - Power supply - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device using a rectangular piezoelectric element.

[0002]

2. Description of the Related Art A power supply using a rectangular piezoelectric element does not require a winding, has a simple structure, can provide a large boosting ratio, and is particularly suitable for supplying a high voltage to a high impedance load. Further, it is nonflammable due to the use of a ceramic piezoelectric element, and is useful for a plain paper copy (PPC), a laser beam printer (LBP), a backlight of a liquid crystal device, and the like.

FIG. 3 shows a conventional rectangular piezoelectric element. The rectangular piezoelectric element 1 has a plate-like shape. One half of one end in the longitudinal direction of the rectangular piezoelectric element 1 is used as an input unit 2 in the thickness direction (arrow P), and the other half is output. The portion 3 is polarized in the longitudinal direction (arrow Q). A pair of input electrodes 4A and 4B are provided on two surfaces of the input unit 2 facing each other in the thickness direction.
An output electrode 5 is formed on an end face of the output section 3 in the longitudinal direction. The input electrodes 4A and 4B are connected to the drive signal source 6,
A lead wire 7 is connected to the output electrode 5. The boosted output voltage is taken out between the lead wire 7 and the ground.

Next, the operation of the rectangular piezoelectric element 1 will be described. The drive signal power supply 6 allows the input electrode 4
When an AC voltage is applied between A and 4B, the piezoelectric effect
Mechanical vibration occurs in the rectangular piezoelectric element 1. When the frequency of the alternating current applied to generate the mechanical vibration substantially matches the mechanical resonance frequency determined by the length and the material of the rectangular piezoelectric element 1, resonance occurs, and a standing wave is generated. As this condition, a vibration mode of full-wave resonance, a vibration mode of half-wave resonance, and the like are known. As a result, in the output section 3 of the rectangular piezoelectric element 1, an electric field distribution is generated by the piezoelectric effect due to the amplified distortion, and a boosted output voltage is obtained at the output electrode 5.

In the output section 3, the input electrodes 4
The generated voltage increases linearly from the ends of A and 4B toward the output electrode 5 and reaches the maximum voltage at the output electrode 5.

Next, FIG. 4 shows a conventional method for holding the rectangular piezoelectric element 1. A rectangular parallelepiped mounting member 8 is mounted at a vibration node position of the rectangular piezoelectric element 1. Fixture 8
The penetrate the both side surfaces in the short side direction opposite the through-hole 9 for fitting the rectangular piezoelectric element 1 is Ru provided. What
The attachment 8 is made of rubber or the like having an insulating property and a high elastic modulus so as not to hinder the vibration of the rectangular piezoelectric element 1. A groove 11 is formed on a substrate 10 which is a molded product.
A pair of U-shaped upright portions 12 having side surfaces are integrally arranged so as to oppose the groove 11. The groove 11 has the same width as the short side of the fixture 8. The fixture 8 is inserted between the opposed grooves 11 to hold the rectangular piezoelectric element 1.

[0007]

In such a conventional holding method, since the rectangular piezoelectric element 1 is disposed on the substrate 10, the thickness of the entire power supply device is increased, and the thickness of the rectangular piezoelectric element 1 is reduced. Was not alive.

Accordingly, an object of the present invention is to provide a power supply device having a small overall thickness.

[0009]

The present invention is configured as follows to achieve the above object. A rectangular piezoelectric element, a fixture attached to the rectangular piezoelectric element, and a printed circuit board having a rectangular opening for disposing the rectangular piezoelectric element. A groove extending in the side direction is provided, and at least one recess is formed in each of the long sides of the opening, and one of the long sides is formed.
A concave portion formed on the long side and a concave portion formed on the other long side
The opposed, mounted in the recess facing the fitting.

[0010]

[Function] Each of the long sides of the opening of the printed circuit board is
At least one recess is formed, and a recess on one long side is formed.
The recesses on the other long side face each other. For a rectangular piezoelectric element,
The fixture is attached. Install on both sides in the long side direction of the fixture.
The cut groove is engaged with the recess formed oppositely, and the rectangular groove is formed.
The shape-shaped piezoelectric element is mounted in the opening of the printed circuit board.

[0011]

FIG. 1 is an exploded perspective view of a power supply device using a rectangular piezoelectric element 1 according to the present invention. The rectangular piezoelectric element 1
Are the same as in the conventional example, and the description is omitted, and the same numbers as in the conventional example are used.

The power supply device includes a rectangular piezoelectric element 1, a printed circuit board 13, and a rectangular piezoelectric element 1 connected to the printed circuit board 1.
3 and a mounting member 14 to be mounted on the mounting member 3.

The printed circuit board 13 has a rectangular opening 15.
And a plurality of recesses 16 are provided on both long sides of the opening 15.
And a recess 16 formed on one of the long sides.
Arranged so that the recess 16 formed on the other long side faces the other.
Is placed . In other places of the printed circuit board 13, components (not shown) constituting, for example, an oscillation circuit, a control circuit, a rectification circuit, and the like are mounted.

The mounting member 14 has a rectangular parallelepiped shape, and has grooves 17 for locking to the printed circuit board 13 on both side surfaces in the long side direction .
The attachment 14 is provided so as to extend in the short side direction. Also, since the rectangular piezoelectric element 1 is attached to the fixture 14, an example
For example, a through hole 1 penetrating both side surfaces in the short side direction of the fixture 14
8 are provided. The width L1 of the groove 17 is
Is the same as the thickness L2. Further, the short side length L3 of the fixture 14 is the same as the width L4 of the recess 16. Further mounting fixture 1
The length L5 between the grooves 1 7 provided on both sides of the longitudinal direction of the 4 is the same as the distance L6 between the recesses 16 of the opening 15. The attachment 14 is made of rubber or the like having an insulating property and a high elastic modulus so as not to hinder the vibration of the rectangular piezoelectric element 1.

FIG. 2 shows a case in which the fixture 14 is attached to two vibrating nodes in the vibration mode of all wavelengths in which the rectangular piezoelectric element 1 has two vibrating nodes.

After the attachment 14 is attached to the vibrating node of the rectangular piezoelectric element 1, the end of the attachment 14 in the long side direction is inserted into the opposing recess 16 of the printed circuit board 13. The groove 17 engages with the printed circuit board 13. Further , both ends in the long side direction of the mounting fixture 14 are sandwiched by the convex portions 19, thereby preventing displacement of the opening 15 in the long side direction. Thus, the rectangular piezoelectric element 1 is held in the opening 15 of the printed circuit board 13 without contacting the printed circuit board 13.

When a lead wire is soldered to the electrodes 4A and 4B, or when the fixture 14 is fitted into the vibration node position of the input unit 2, a conductor is provided between the fixture 14 and the electrodes 4A and 4B. The lead wire is connected to the conductor by interposing.

The output voltage is obtained by soldering a lead wire to the output electrode 5 of the output section 3 of the rectangular piezoelectric element 1. When the mounting member 14 is mounted at the position of the vibration node of the output section 3, a conductive mounting member 14 is used, and the mounting member 14 is connected to the printed wiring formed in the recess 16 of the printed circuit board 13 and taken out. You may. In this case, as the material of the attachment 14, a conductive rubber or the like having a high elastic modulus is used so as not to hinder the movement of the rectangular piezoelectric element 1 at the time of resonance.

When a plurality of output voltages are to be extracted, a lead wire is wrapped around an output voltage extractor (not shown) made of conductive rubber attached to the output section 3 of the rectangular piezoelectric element 1. You may take it out. The output voltage extractor has a rectangular parallelepiped shape, and the length of the long side is shorter than the distance L7 of the facing convex portion 19 because it does not contact the long side of the opening 15. Also on the short side
Through holes for attaching to the output unit 3 are provided on both side surfaces in the direction .

[0020]

[Effects of the Invention] Since the present invention is configured as described above,
The rectangular piezoelectric element 1 is fixed on the same plane as the printed circuit board 13 by the fixture 14. Therefore, the power supply device using the rectangular piezoelectric element 1 can be made thin. When the vibration mode is changed, the fixture 14 is moved to the vibration node position of the rectangular piezoelectric element 1 and locked by using the opposing concave part at the optimum position among the plural concave parts 16. Can be.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of the on-board type high voltage generator of the present invention.

FIG. 2 is an assembly view of the on-board type high voltage generator of the present invention.

FIG. 3 is a schematic view of a conventional piezoelectric transformer.

FIG. 4 is an exploded perspective view of a conventional piezoelectric transformer power supply.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rectangular piezoelectric element 2 Input part 3 Output part 4A, 4B Input electrode 5 Output electrode 8 Attachment 10 Substrate 11 Groove 12 Standing part 13 Printed circuit board 14 Attachment 15 Opening 16 Depression 17 Groove 18 Through hole 19 Convex part

Claims (1)

(57) [Scope of request for utility model registration] A rectangular-shaped piezoelectric element, a fixture attached to the rectangular-shaped piezoelectric element, and a printed circuit board provided with a rectangular opening for disposing the rectangular-shaped piezoelectric element;
Grooves extending in the short side direction are provided at both ends in the long side direction of the mounting fixture, and at least one recess is formed in each of the long sides of the opening, and the recess formed in one long side is formed.
A power supply device, wherein a portion and a concave portion formed on the other long side are provided to face each other, and the mounting tool is mounted in the concave portion facing the other .