JP2007019672A - Exciter for panel type speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a contact portion of a spring of a power supply means from wearing in an exciter for a panel type speaker used for compact portable equipment such as a mobile phone. <P>SOLUTION: The exciter 10 for the panel type speaker has the U-shaped spring 6 for power supply inserted into a bimorph holding part 2 holding a bimorph 1. The spring 6 has two contact portions 6a nearby tips and also has T-shaped guide portions 6b at the two tips. A spring holding part 7 has a tapered slope portion 7a and the guide portions 6b of the spring 6 move to the slope portion 7a as a guide reception portion to be opened. The spring holding part 7 has a recess 8 where neither of the guide portions 6b of the spring 6 comes into contact. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an exciter for a panel type speaker used in a small portable device such as a mobile phone.

  Conventionally, a piezoelectric element is one of passive elements using the piezoelectric effect, and is used as an exciter for a panel type speaker, for example. In order to supply power to the exciter, a spring is used. The spring is connected to electrodes on both sides of a bimorph that is a piezoelectric element, and is further used as a means for taking it out (see, for example, Patent Document 1).

  FIG. 9 is a plan view showing such a conventional panel-type speaker exciter. FIG. 10 is a cross-sectional view showing the AA cross section of FIG. In FIG. 9, reference numeral 50 denotes an exciter for a panel type speaker. Reference numeral 1 denotes a bimorph in which a piezoelectric layer made of a piezoelectric element or the like that requires power feeding is formed on both the front and back surfaces of a metal plate. Reference numeral 51 denotes a holding unit for holding the bimorph 1. Reference numeral 3 denotes one input terminal of the drive signal. Reference numeral 56 denotes a bifurcated power supply spring having a U-shaped cross section having two contact portions 56a at the tip, and the spring 56 is formed with a tab 56b as the other input terminal of the drive signal. Reference numeral 57 denotes a spring holding portion formed in the holding portion 51, and the electrode surface 1 a of the bimorph 1 contacts the spring 56 in the spring holding portion 57. When an AC signal is supplied to the bimorph 1 through the signal input terminal 3 and the tab 56b, the piezoelectric layer expands and contracts in the longitudinal direction of the bimorph 1 to excite a bending signal.

Here, the assembled state of the spring 56 will be described. FIG. 11 is a cross-sectional view of the exciter 50 showing a state before the spring is assembled. In FIG. 11, when the spring 56 is inserted, the tip end portion opens according to the shape of the tip end portion of the bimorph 1, and the contact portion 56 a slides along the electrode surface 1 a of the bimorph 1 and is fixed at the position shown in FIG. 10.
Japanese Patent Laid-Open No. 6-338752 (FIG. 1-2, paragraph number 0013-016)

  However, when the spring 56 is inserted into the bimorph 1 of the spring holding portion 57, the contact portion 56 a of the spring 56 slides on the surface of the bimorph 1. There is a possibility of damage.

  The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide an exciter for a panel type speaker in which the contact portion of the spring of the power supply means is not consumed.

  The means of the present invention for achieving the above object uses a bimorph comprising a piezoelectric element or the like that requires power feeding on both sides, a resin-molded holding portion for fixing the bimorph, and a spring formed on the holding portion In an exciter for a panel type speaker having a structure in which a power supply spring comprising a bifurcated leaf spring having a U-shaped cross section is inserted into the spring holding part, a guide part is provided at the tip of the spring, and the spring holding The guide receiving portion for receiving the guide portion is provided at a portion, and at the stage of starting insertion of the spring, the guide portion and the guide receiving portion come into contact with each other to open the spring, and at the stage of end of inserting the spring, The spring is closed without contact between the guide portion and the guide receiving portion.

  The guide portion of the spring is formed in a T shape at the tip of the spring, and the guide receiving portion that receives the guide portion is a slope portion that contacts the guide portion of the spring provided along the spring insertion direction. And a flat portion that continues to the slope portion and a relief portion that does not contact the guide portion of the spring.

  The guide part of the spring is formed at the tip of a leaf spring having a long hole or a recess in the center, and the guide receiving part for receiving the guide part is a slope part provided along the spring insertion direction and the long hole. Or it consists of the escape part which does not contact the protrusion part which fits with a recessed part, and the guide part of the said spring.

  According to the present invention, a bimorph composed of a piezoelectric element or the like that requires power supply on both sides is used, and a resin-molded holding portion for fixing the bimorph and a spring holding portion formed on the holding portion have a U-shaped cross section. In a panel-type speaker exciter having a structure in which a power supply spring comprising a bifurcated leaf spring is inserted into the spring holding portion, a guide portion is provided at the tip of the spring, and the guide is received by the spring holding portion. A receiving portion is provided, and at the stage of starting insertion of the spring, the guide portion and the guide receiving portion come into contact with each other to open the spring, and at the stage of finishing inserting the spring, the guide portion and the guide receiving portion Since the spring closes without contact, the contact portion is open during insertion of the spring, and the contact portion contacts the electrode surface for the first time when insertion is completed, so the contact portion of the spring does not wear.Therefore, an exciter without impairing the performance as a contact point was obtained.

  Hereinafter, an exciter for a panel type speaker according to a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view showing an exciter for a panel type speaker according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view showing the AA cross section of FIG. 3 and 4 are cross-sectional views showing the operation of assembling the power supply spring.

  First, the structure of the exciter for panel type speakers which is the 1st Embodiment of this invention is demonstrated. In FIG. 1, reference numeral 10 denotes an exciter for a panel type speaker. Reference numeral 2 denotes a resin-molded bimorph holding portion that holds the bimorph 1. Reference numeral 6 denotes a power supply spring composed of a bifurcated leaf spring having a U-shaped cross section. The spring 6 has two contact portions 6a facing each other near the tip, and a T-shaped guide portion 6b is formed at the two tips. Reference numeral 7 denotes a spring holding portion that incorporates and holds the spring 6. The spring holding portion 7 has a tapered slope portion 7 a and a slope portion 7 a as guide receiving portions that receive the guide portion 6 b along the approach direction of the spring 6. The flat part 7b following and the below-mentioned escape part are formed. Reference numeral 8 denotes an escape portion for escaping the guide portion 6b formed in the spring holding portion 7, and the guide portion 6b does not contact the escape portion 8. Since other configurations are the same as those of the conventional exciter 50, the same components are denoted by the same reference numerals and names, and detailed description thereof is omitted.

  Next, the order of assembling the spring will be described with reference to FIGS. When the spring 6 is inserted into the spring holding portion 7 of the panel type speaker 10, in the initial stage of insertion, the guide portion 6 b of the spring 6 extends along the slope 6 a of the spring holding portion 7 formed on the spring 6 and the holding portion 2. Slides to open the spring 6, and during insertion, the guide part 6 b slides on the flat part 7 b of the spring holding part 7, and the contact part 6 a does not contact the bimorph 1. In the final stage of insertion, since the guide portion 6b enters the escape portion 8, the spring 6 becomes free and the urging force is applied to close the contact portion 6a to contact the bimorph 1.

  Next, effects of the first exemplary embodiment of the present invention will be described. During the insertion of the spring, the contact portion 6a is open. Since the contact portion 6a contacts the bimorph 1 for the first time when the insertion is completed, the contact portion 6a is not worn during the insertion stroke. Therefore, an exciter that does not impair the performance as a contact can be obtained.

  Next, a panel type speaker exciter according to a second embodiment of the present invention will be described in detail with reference to the drawings. FIG. 5 is a sectional view showing an exciter for a panel type speaker according to a second embodiment of the present invention. 6 is a cross-sectional view showing the AA cross section of FIG. 7 and 8 are cross-sectional views showing the operation of assembling the power supply spring.

  In FIG. 5, reference numeral 20 denotes an exciter for a panel type speaker according to the second embodiment of the present invention. Reference numeral 12 denotes a resin-molded holding portion of the bimorph 1. Reference numeral 16 denotes a power supply spring. The spring 16 is formed with two leaf springs having a U-shaped cross section. The leaf springs are closest to each other at the contact part 16a and open from the contact part 16a to the tip part. A contact hole 16a is included in the center of the leaf spring portion, and a long hole 16c is formed except for the guide portion 16b at the tip. Reference numeral 17 denotes a spring holding portion formed on the holding portion 12 of the bimorph 1. The spring holding portion 17 is formed with a protruding portion 17c and a relief portion 8 as a guide receiving portion that receives the guide portion 16b having a width narrower than the width of the long hole 16c of the spring 16. The projecting portion 17c includes a tapered slope portion 17a along the approach direction of the spring 16 and a flat portion 17b following the slope portion 17a. Since the other configuration is the same as that of the exciter 10 according to the first embodiment, the same components are denoted by the same reference numerals and names, and detailed description thereof is omitted.

  Next, the order of assembling the power supply spring will be described with reference to FIGS. When inserting the spring 16, in the initial stage of insertion, the guide portion 16 b of the spring 16 slides while riding on the protrusion portion 17 c, so that the contact portion 16 a does not contact the bimorph 1. At the final stage of insertion, the guide portion 16b passes over the projection portion 17c and enters the escape portion 8 and the projection portion 17c enters the elongated hole 16c. Therefore, the spring 16 becomes free and closes by a biasing force, so that the contact portion 16a becomes bimorph. 1 is contacted.

  Next, effects of the second exemplary embodiment of the present invention will be described. During the insertion of the spring 16, the contact portion 16a is open, and the contact portion 16a contacts the bimorph 1 for the first time when the insertion is completed, so that the contact portion 16a of the spring 16 is not worn. Therefore, an exciter that does not impair the performance as a contact can be obtained. The elongated hole 16c may be a concave portion in which the protruding portion 17c is accommodated.

  The panel type speaker exciter of the present invention can be widely applied to mobile phones, notebook PCs, PDAs and the like.

It is a top view which shows the exciter for panel type speakers which is the 1st Embodiment of this invention. It is sectional drawing which shows the AA cross section of FIG. It is sectional drawing which shows the assembly order of the spring which is the 1st Embodiment of this invention. It is sectional drawing which shows the assembly order of the spring which is the 1st Embodiment of this invention. It is a top view which shows the exciter for panel type speakers which is the 2nd Embodiment of this invention. It is sectional drawing which shows the AA cross section of FIG. It is sectional drawing which shows the assembly order of the spring which is the 2nd Embodiment of this invention. It is sectional drawing which shows the assembly order of the spring which is the 2nd Embodiment of this invention. It is a top view which shows the conventional exciter for panel type speakers. It is sectional drawing which shows the AA cross section of FIG. It is sectional drawing which shows the assembly order of the conventional spring.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bimorph 2,12 Holding part 6,16 Spring for power supply 6a, 16a Contact part 6b, 16b Guide part 7, 17 Spring holding part 7a, 17a Slope part 7b, 17b Flat part 8 Escape part 10, 20 Exciter 16c Elongation hole 17c protrusion

Claims (3)

  A bimorph leaf spring having a U-shaped cross section having a resin-molded holding portion for fixing the bimorph and a spring holding portion formed on the holding portion, using a bimorph consisting of a piezoelectric element or the like that requires power feeding on both sides An exciter for a panel type speaker having a structure in which a power supply spring comprising the above is inserted into the spring holding portion, a guide portion is provided at the tip of the spring, and a guide receiving portion for receiving the guide portion is provided at the spring holding portion, In the spring insertion start stage, the guide part and the guide receiving part come into contact with each other to open the spring, and in the spring insertion end stage, the guide part and the guide receiving part do not come into contact with each other. Exciter for panel type speaker characterized by closing.   The guide portion of the spring is formed in a T shape at the tip of the spring, and the guide receiving portion that receives the guide portion is an inclined surface portion that contacts the guide portion of the spring provided along the spring insertion direction, and this 2. The exciter for a panel type speaker according to claim 1, comprising a flat portion continuous with the slope portion and a relief portion that does not contact the guide portion of the spring. The guide portion of the spring is formed at the tip of a leaf spring having a long hole or a recess in the center, and the guide receiving portion that receives the guide portion is a slope portion provided along the spring insertion direction and the long hole or the recess. 2. An exciter for a panel type speaker according to claim 1, wherein the exciter is configured to include a protruding portion that fits with the guide portion of the spring and a relief portion that does not contact the guide portion of the spring.

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