JP2009033864A - Vibration generator - Google Patents

Abstract

An object of the present invention is to eliminate the need for strict management of positioning accuracy and to improve the Q value of the resonance frequency of vibration while ensuring good workability.
A mover 15 elastically supported in a cover 12 of a housing 11 via an annular leaf spring 19 and a coil 14 for driving the mover 15 are provided, and the coil 14 is energized. In the vibration generator 10 that vibrates the mover 15, elastic bodies 31 to 36 are attached or applied to the end portions or intermediate portions of the intermediate arc portions 23, 24, and 25 of the leaf spring 19. In this case, the elastic bodies 31 to 36 are fixed so as to straddle the base portions or intermediate portions of the intermediate arc portions 23, 24, 25 and the slits 26, 27, 28.
[Selection] Figure 4

Description

  The present invention relates to a vibration generating device, and more particularly to a vibration generating device that is incorporated in a mobile communication device such as a mobile phone or a PDA, a game device, etc., and notifies a user of an incoming call or a bodily sensation by vibration.

  A conventional vibration generator of this type includes a housing in which a bottom case as a stator and a cover are integrally coupled, a driving coil fixed to the bottom case of the housing, and a resiliently elastically movable to the cover of the housing. A movable element supported by the movable element, and the movable element is formed by integrally coupling a magnet and a movable part yoke.

  According to this vibration generator, when the coil is energized, the mover vibrates up and down by the electromagnetic force generated in the coil and the magnetic flux generated in the magnet of the mover.

  As shown in FIG. 8, the movable element 1 includes a flat bottomed cylindrical first movable part yoke 1a having a lower surface opening, a magnet 1b fixed to the inner surface of the first movable part yoke 1a, The second movable portion yoke 1c is fixed to the lower surface of the magnet 1b. Further, an annular leaf spring 2 is fixed to the outer periphery of the first movable portion yoke 1a, and an outer peripheral edge portion of the leaf spring 2 is fixed to a peripheral side wall (not shown) of the casing.

  As shown in FIG. 9, the leaf spring 2 has a plurality of intermediate arc portions (vibration deforming portions) 5 between the inner ring portion 3 and the outer ring portion 4. The intermediate arc portions 5 are arranged at equal intervals in the circumferential direction of the leaf spring 2. In the illustrated example, substantially arc-shaped slits 6 are opened at the inner and outer peripheral edges of each intermediate arc portion 5, and one end portion and the other end portion of the intermediate arc portion 5 are the inner peripheral ring portion 3 and the outer peripheral ring, respectively. The unit 4 is integrally connected.

As described above, the vibration generated in the mover 1 is transmitted to the housing via the leaf spring 2. In this case, in order to increase the Q value of the resonance frequency of the vibration, for example, as shown in FIG. An elastic body 8 is interposed (pinched) between the leaf spring 2 and the mover 1 (see, for example, Patent Documents 1 and 2).
Japanese Patent No. 3375233 JP 2003-9495 A

  In the conventional vibration generator, an elastic body is interposed between the leaf spring and the mover in order to improve the Q value of the resonance frequency of the vibration. Since it is difficult to perform an intervening operation, productivity is significantly reduced. In addition, since the elastic body cannot directly absorb and remove the vibration vibration of the vibration deformation portion (intermediate arc portion) of the leaf spring, the effect of improving the Q value of the resonance frequency of the vibration is small.

  In order to enhance the effect of improving the Q value of the resonance frequency of the vibration, it is conceivable to increase the thickness of the elastic body. In this case, the usage amount (coating amount) of the elastic body increases. Further, there is a problem that the positioning accuracy (including assembly accuracy) of the leaf spring and the mover must be strictly managed in accordance with the thickness of the elastic body.

  Therefore, there is a technical problem that needs to be solved in order to improve the Q value of the resonance frequency of the vibration while making strict management of the positioning accuracy unnecessary and ensuring good workability. The present invention aims to solve this problem.

  The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is a housing in which a cover is integrally coupled to a bottom case, a housing disposed in the housing, and a magnet. And a movable part comprising a movable part yoke, an annular leaf spring interposed between the movable part and the housing, and a drive coil fixed to the bottom case, to the drive coil In the vibration generating device configured to transmit the vibration generated in the mover by energization to the housing via the leaf spring, the vibration deforming portion of the leaf spring, or the mover and the housing There is provided a vibration generating device configured such that an elastic body is fixed to the cover and the vibration is absorbed and removed by the elastic body.

  According to this configuration, vibration generated in the mover is transmitted to the housing via the leaf spring. At this time, since the elastic body is fixed between the vibration deforming portion of the leaf spring or between the movable element and the cover of the housing, the vibration vibration is absorbed or removed directly or indirectly by the elastic body. As a result, the Q value of the resonance frequency of vibration is improved, and the usable operating frequency band can be widened accordingly.

  According to a second aspect of the present invention, the elastic body is fixed to the surface of the vibration deforming portion of the leaf spring or the surface of the movable element or the casing by means of adhering or applying. A vibration generator is provided.

  According to this configuration, when the elastic body is fixed to the leaf spring, the elastic body is easily fixed to a predetermined position of the vibration deformation portion simply by sticking or applying to the surface of the vibration deformation portion or the like of the leaf spring. .

  According to a third aspect of the present invention, the vibration deforming portion of the leaf spring is partitioned into an arc shape by a slit, and the elastic body is fixed to the root portion and / or the intermediate portion of the vibration deforming portion so as to straddle the slit. A vibration generator according to claim 1 or 2 is provided.

  According to this configuration, the elastic body is fixed so as to straddle the slit at the root portion and / or the intermediate portion of the vibration deforming portion, and thus the base portion and / or the intermediate portion of the vibration deforming portion, i.e., the housing. The vibration vibration is directly absorbed and removed in the vibration path portion where vibration is transmitted to the body.

  A fourth aspect of the present invention provides the vibration generating device according to the first, second, or third aspect, wherein a plurality of the elastic bodies are fixed at equal intervals in the circumferential direction of the leaf spring.

  According to this configuration, since the plurality of elastic bodies are arranged at equal intervals in the circumferential direction of the leaf spring, the vibration removal absorption action by the elastic body is performed with respect to the center of the leaf spring. It is performed simultaneously at a plurality of rotationally symmetric places.

  According to the first aspect of the present invention, since vibration of vibration transmitted from the mover to the housing can be effectively absorbed and removed by the elastic body, the Q value of the resonance frequency of vibration can be greatly improved, and accordingly The effective band of the operating frequency that can be used as vibration can be expanded.

  Further, unlike the conventional structure in which an elastic body is interposed between the leaf spring and the mover, the elastic body of the present invention can be easily attached to the surface of the vibration deformation portion of the leaf spring or the surface of the mover. In addition, it is not necessary to strictly manage the positioning accuracy between the leaf spring and the mover, and the productivity of the vibration generator can be improved as compared with the conventional case. Furthermore, the elastic body can be accurately and easily fixed to a predetermined location, and the quality reliability of the vibration generator can be improved.

  In the invention according to claim 2, since the elastic body can be easily fixed by sticking or applying to the surface of the vibration deformation portion of the leaf spring, in addition to the effect of the invention according to claim 1, the attaching work of the elastic body It has the merit that the property is improved compared with the conventional one.

  According to the invention described in claim 3, since the elastic body effectively absorbs and removes vibration vibration at the root and / or the intermediate part of the vibration deforming part, in addition to the effect of the invention described in claim 1 or 2, The resonance frequency Q value can be improved more efficiently, and the effective band of the operating frequency that can be used as the vibration generator can be further expanded.

  In the invention according to claim 4, since the action of absorbing and removing vibration vibration by the elastic body is performed at a plurality of rotationally symmetrical positions with respect to the center of the leaf spring, the invention according to claim 1, 2 or 3 In addition to the effect, the effect of improving the Q value of the resonance frequency of the vibration can be more evenly and efficiently exhibited over the entire leaf spring.

  The present invention eliminates the need for strict control of positioning accuracy, and in order to achieve the object of improving the Q value of the resonance frequency of vibration while ensuring good workability, the cover is integrated with the bottom case. A coupled casing, a movable element disposed in the casing and including a magnet and a movable part yoke, an annular leaf spring interposed between the movable element and the casing, and the bottom case A vibration generating device configured to transmit vibration generated in the mover by energization of the driving coil to the housing via the leaf spring. The elastic body is fixed between the vibration deforming portion of the leaf spring or the movable element and the cover of the housing, and the vibration is absorbed and removed by the elastic body.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 is a perspective view of the vibration generator of the present invention, FIG. 2 is an exploded perspective view of FIG. 1, FIG. 3 is a longitudinal sectional view of a mover of the vibration generator, and FIG. 4 is an elastic body on a leaf spring of the vibration generator. FIG. 5 is a waveform diagram for explaining the vibration characteristics of the vibration generator, and FIG. 6 is a plan view showing another embodiment in which an elastic body is fixed to the leaf spring of the vibration generator. is there.

  In this embodiment, the mover in the housing is elastically supported by an annular leaf spring, and an arc-shaped vibration deformation portion (intermediate arc portion) is formed on the leaf spring, and the root portion of the vibration deformation portion is formed. Or, by fixing the elastic body to the intermediate portion by means of sticking or coating, the fixing workability of the elastic body is improved and the vibration suppressing action of the vibration deforming portion is increased. The elastic body can be fixed to both the root portion and the intermediate portion of the vibration deformation portion depending on the size and number of vibration deformation portions.

  In the figure, reference numeral 11 denotes a housing of the vibration generator 10, which is formed by integrally connecting a flat cylindrical cover 12 and a disk-shaped bottom case (stator) 13 to each other. ing. As shown in FIG. 2, a cylindrical driving coil 14 is fixed to the center of the upper surface of the bottom case 13, and a lead wire (not shown) is connected to the coil 14.

  A movable element 15 is accommodated in the casing 11, and the movable element 15 includes a flat bottomed cylindrical first movable part yoke (upper yoke) 16 having a lower surface opening as shown in FIG. And a disc-shaped magnet 17 fixed to the inner surface of the upper surface of the first movable portion yoke 16 and a disk-shaped second movable portion yoke (lower yoke) 18 fixed to the lower surface of the magnet 17. Has been.

  Further, an annular leaf spring 19 is fixed to the outer peripheral step portion below the first movable portion yoke 16. The outer peripheral portion of the leaf spring 19 is fixed to the side wall of the housing 11. Further, a ring-shaped space S is formed between the inner peripheral surface of the first movable portion yoke 16 and the outer peripheral surfaces of the magnet 17 and the second movable portion yoke 18, and the upper portion of the coil 14 is formed in the space S. It is charged.

  Further, intermediate circular arc portions (vibration deforming portions) 23, 24, 25 are formed by three slits 26, 27, 28 in the radial intermediate portion of the annular leaf spring 19. That is, as shown in FIG. 4, three intermediate arc portions 23, 24, 25 are formed between the inner ring portion 21 and the outer ring portion 22 of the leaf spring 19, and the intermediate arc portions 23, 24, 25 are formed. 25 are arranged at equal intervals (120 degrees) in the circumferential direction of the leaf spring 19.

  The planar shapes of the slits 26, 27, 28 are inner circular arc portions 26 a, 27 a, 28 a extending along the outer edge portion of the inner peripheral ring portion 21, and outer circular arc portions 26 b extending along the inner edge portion of the outer peripheral ring portion 22. 27b, 28b, and central communication portions 26c, 27c, 28c for communicating the outer peripheral arc portions 26b, 27b, 28b with the inner peripheral arc portions 26a, 27a, 28a.

  In the illustrated example, the inner peripheral edge and the outer peripheral edge of each of the three intermediate arc portions 23, 24, 25 and the inner peripheral ring portion 21 and the outer peripheral ring portion 22 are the inner peripheral arc portions 26 a of the slits 26, 27, 28. 27a, 28a and outer circular arc portions 26b, 27b, 28b, respectively.

  Further, one end of each of the intermediate arc portions 23, 24, 25 (hereinafter referred to as “inner peripheral side base portions 23a, 24a, 25a”) is connected to the inner peripheral arc portions 26a, 27a, 28a of the slits 26, 27, 28. Are connected to the unit. The other end portions of the intermediate arc portions 23, 24, 25 (hereinafter referred to as “outer peripheral side base portions 23b, 24b, 25b”) are connected to the outer peripheral arc portions 26b, 27b, 28b of the slits 26, 27, 28, respectively. Connected together.

  Accordingly, each of the intermediate arc portions 23, 24, and 25 is formed in a double-supported structure, and the thickness of the leaf spring 19 with the inner peripheral side base portions 23a, 24a, and 25a and the outer peripheral side base portions 23b, 24b, and 25b as fulcrums. It is configured to vibrate in the direction. In the vibration generator 10, vertical vibration is generated in the mover 15 by the electromagnetic force generated in the coil 14 by energization and the magnetic flux generated by the magnet 15. The vibration generated in the mover 15 is transmitted to the cover 12 of the housing 11 via the leaf spring 19.

  Next, the characteristic part of a present Example is demonstrated. As shown in FIG. 4, elastic bodies 31 to 36 are fixed to a plurality of, for example, six locations on both ends of the vibration deformation portion of the leaf spring 19 by means of coating or pasting. The elastic bodies 31 to 36 are made of soft synthetic resin, for example, soft elastic material such as epoxy synthetic resin or rubber.

  In the embodiment shown in FIG. 4, the three elastic bodies 31, 32, and 33 are attached so as to straddle one end of the slits 26, 27, and 28 at the inner peripheral base portions 23 a, 24 a, and 25 a. . Therefore, the three elastic bodies 31, 32, 33 are arranged at equal intervals (rotation symmetry) of 120 degrees along the inner circumferential direction of the leaf spring 19.

  The three elastic bodies 34, 35, and 36 are attached so as to straddle the other end portions of the slits 26, 27, and 28 at the outer peripheral side base portions 23b, 24b, and 25b. Therefore, the three elastic bodies 34, 35, and 36 are also arranged at intervals of 120 degrees (rotationally symmetric) along the outer peripheral direction of the leaf spring 19 as described above.

  According to this embodiment, when the vibration generator 10 is driven, the vibration generated in the movable element 15 is transmitted to the housing 11 via the intermediate arc portions 23, 24, and 25 of the leaf spring 19. At the time of this vibration transmission, the elastic body 31, 32, 33 fixed to the inner peripheral side base portions 23a, 24a, 25a of the intermediate arc portions 23, 24, 25 is transmitted through the inner peripheral side base portions 23a, 24a, 25a. Vibration vibration is directly absorbed and removed. Similarly, vibrations transmitted through the outer peripheral side base portions 23b, 24b, 25b are caused by the elastic bodies 34, 35, 36 fixed to the outer peripheral side base portions 23b, 24b, 25b of the intermediate arc portions 23, 24, 25. Absorbed directly.

  Thus, in the inner peripheral side base portions 23a, 24a, 25a and the outer peripheral side base portions 23b, 24b, 25b of the intermediate arc portions 23, 24, 25, the elastic bodies 31, 32, 33 and the elastic bodies 34, 35, Since the vibration vibration can be directly absorbed and removed by 36, the Q value of the resonance frequency of the vibration is improved, and the effective band usable as the operating frequency is greatly expanded.

  FIG. 5 shows a waveform of a vibration characteristic indicating the relationship between the frequency f and the vibration output P. FIG. 5A shows a waveform S of a conventional type vibration generator in which an elastic body is not fixed to a leaf spring. ) Is a waveform B of the vibration generator of the present invention in which an elastic body is fixed to a leaf spring.

As shown in the figure, since the waveform S of the vibration characteristic of the conventional example has a steep slope around the normal resonance frequency f ₀ , in order for the vibration output to clear the appropriate value (pass value) P ₀ , The effective frequency band must be within the range of width A.

For this reason, the frequency of the voltage waveform applied to the coil due to a processing error (assembly error) of the assembly parts of the vibration generator is the value A / from the resonance frequency f ₀ shown in FIG. When the shift is performed by 2, the vibration output is reduced to an appropriate value P ₀ or less, so that the product is determined to be a rejected product.

On the other hand, the waveform T of the vibration characteristic of the present invention has a gentle slope around the normal resonance frequency f ₀ , so that the effective frequency band for clearing the appropriate value P ₀ is the conventional width A. It suffices to be within the wider width B.

Therefore, the frequency of the applied voltage of the coil by such machining errors of the component, be shifted from the resonance frequency f ₀ to the left or right by the value A / 2, the vibration output proper value P ₀ or more Since the product is maintained, the product is determined to be an acceptable product.

  In short, in the present invention, since the elastic bodies 31 to 36 are fixed to predetermined positions of the plate spring 19, the effective band that can be used as the operating frequency of the vibration generator 10 is expanded. As a result, the allowable range of machining errors (including assembly errors) of the assembly parts of the vibration generator 10 is wider than in the past, so that it is not necessary to manage the machining errors as in the conventional case, and the vibration generator is not required. The productivity of 10 is greatly improved.

  Further, when the elastic bodies 31 to 36 are fixed to the plate spring 19, the elastic bodies 31 to 36 may be simply applied or adhered to the surface of the plate spring 19 from the outside. Therefore, the elastic bodies 31 to 36 can be easily and quickly fixed to the leaf spring 19, and the workability when the elastic bodies 31 to 36 are fixed is remarkably improved.

  In addition, the elastic bodies 31 to 36 can be accurately fixed to predetermined positions of the inner peripheral side base portions 23a, 24a, and 25a and the outer peripheral side base portions 23b, 24b, and 25b. The accuracy is improved and the product quality reliability is dramatically increased.

  Further, the six elastic bodies 31 to 36 are arranged at equal intervals along the circumferential direction of the leaf spring 19. Therefore, the vibration vibration absorption and removal action by the elastic bodies 31 to 36 is simultaneously performed at six locations that are rotationally symmetric with respect to the center of the leaf spring 19, so that the Q value of the resonance frequency is improved. It is demonstrated evenly throughout.

  In the configuration example of FIG. 4 described above, the fixing points of the elastic bodies 31 to 36 are the inner peripheral side base portions 23a, 24a, 25a and the outer peripheral side base portions 23b, 24b, 25b of the intermediate arc portions 23, 24, 25. The present invention is not limited to this, and may be, for example, a central portion in the length direction of each intermediate arc portion 23, 24, 25, or an intermediate portion in the vicinity of the central portion.

  FIG. 6 shows an embodiment in which elastic bodies 37, 38, 39 are fixed to each intermediate arc portion 23, 24, 25 in the longitudinal direction by coating or sticking. Even if comprised in this way, the effect similar to the Example shown in the said FIG. 4 can be acquired.

  Next, another embodiment of the present invention is shown in FIG. The same parts as those in the embodiment shown in FIGS. 1 to 6 are denoted by the same reference numerals, and the description thereof is omitted. This embodiment is characterized in that an elastic body 40 is fixed between the cover 12 and the movable element 15 of the housing 11 by coating or sticking.

  Even if comprised in this way, there can exist an effect similar to the said Example. That is, part of the vibration generated in the mover 15 is transmitted to the cover 12 of the housing 11 via the elastic body 40, and at that time, the vibration shake is absorbed and removed by the elastic body 40. As a result, the Q value of the resonance frequency of vibration is remarkably improved, and the effective band of the operating frequency is expanded accordingly. Further, since the elastic body 40 can be easily fixed to the upper surface of the movable element 15 or the lower surface of the cover 12, workability when fixing the elastic body 40 is greatly improved.

  The present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified one.

The perspective view of the vibration generator which shows one Example of this invention. The exploded perspective view of FIG. The longitudinal cross-sectional view of the needle | mover of the vibration generator of FIG. It is a top view which shows the other example of arrangement | positioning which fixed the elastic body to the leaf | plate spring of the vibration generator of FIG. The waveform figure of the vibration characteristic of a vibration generator is shown, (a) is a wave form chart of the vibration characteristic of a prior art example, (a) is a wave form chart of the vibration characteristic of the present invention. It is a top view which shows the other example of arrangement | positioning which fixed the elastic body to the leaf | plate spring of the vibration generator of FIG. The perspective view of the vibration generator which shows the other Example of this invention. The longitudinal cross-sectional view of the vibration generator of a prior art example. The top view of the leaf | plate spring of the vibration generator of a prior art example. Sectional drawing explaining the structural example in the connection part of the needle | mover of the vibration generator of a prior art example, a housing | casing, and a leaf | plate spring.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vibration generator 11 Case 12 Cover 13 Bottom case 14 Driving coil 15 Movable element 16 First movable part yoke (upper yoke)
17 Magnet 18 Second movable part yoke (lower yoke)
19 Leaf spring (diaphragm)
21 Inner ring part 22 Outer ring part 23, 24, 25 Intermediate arc part (vibration deformation part)
23a, 24a, 25a Inner peripheral side base portions 23b, 24b, 25b Outer peripheral side base portions 26, 27, 28 Slits 26a, 27a, 28a Inner peripheral arc portions 26b, 27b, 28b Outer peripheral arc portions 26c, 27c, 28c Central communication portions 31-40 Elastic body

Claims (4)

A case in which a cover is integrally coupled to the bottom case; a mover that is disposed in the case and includes a magnet and a movable portion yoke; and an annular member interposed between the mover and the case A leaf spring and a driving coil fixed to the bottom case are provided, and vibration generated in the mover by energization of the driving coil is transmitted to the housing via the leaf spring. In the configured vibration generator,
An elastic body is fixed between the vibration deforming portion of the leaf spring or the movable element and the cover of the housing, and the vibration is absorbed and removed by the elastic body. Vibration generator.   2. The vibration generation according to claim 1, wherein the elastic body is fixed to the surface of the vibration deforming portion of the leaf spring, or the surface of the movable element or the casing by means of adhesion or application. apparatus.   The vibration deformation portion of the leaf spring is partitioned into an arc shape by a slit, and the elastic body is fixed to a root portion and / or an intermediate portion of the vibration deformation portion so as to straddle the slit. The vibration generator according to claim 1 or 2.   4. The vibration generating device according to claim 1, wherein a plurality of the elastic bodies are fixed at equal intervals in the circumferential direction of the leaf spring.

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