JP2009028642A - Vibration generating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration generating device which moderates the stress to act on the fixed portion of a leaf spring efficiently and which aims to reduce the cost without necessitating the management of the additional molding processing to a leaf spring portion and the strict processing accuracy. <P>SOLUTION: The vibration generating device consists of a magnet 17 and a movable yoke 16 and is provided with a movable element 15 elastically supported through the circular leaf spring 19 to an enclosure 11 and a coil 14 for driving the movable element 15. Further, in the vibration generating device 10 to vibrate the movable element 15 by electrically conducting the coil 14, it is characterized by having a structure that a flank part 32, 34 is recessed to the cover 12 of the enclosure 11 and the movable yoke 16 so that the stress to act on the fixed part of the leaf 19 via the flank part 32, 34 is moderated and removed. <P>COPYRIGHT: (C)2009,JPO&INPIT

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 is a casing in which a bottom case as a stator and a cover are integrally coupled, a driving coil fixed to the bottom case of the casing, and a vibration of the cover of the casing. The movable element is elastically supported, and the movable element is formed by integrally connecting 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. 7, the mover 1 includes a flat bottomed cylindrical first movable part yoke 2 having a lower surface opening, a magnet 3 fixed to the inner surface of the first movable part yoke 2, The second movable portion yoke 4 is fixed to the lower surface of the magnet 3. Further, an annular leaf spring 5 is fixed to the outer periphery of the first movable portion yoke 2, and an outer peripheral edge portion of the leaf spring 5 is fixed to a peripheral side wall (not shown) of the casing.

As shown in FIG. 8, the leaf spring 5 has a plurality of intermediate arc portions (vibration deformation portions) 8 between the inner ring portion 6 and the outer ring portion 7. The intermediate arc portions 8 are arranged at equal intervals in the circumferential direction of the leaf spring 5. In the illustrated example, a substantially arc-shaped slit 9 is opened at the inner and outer peripheral edges of each intermediate arc portion 8, and one end portion and the other end portion of the intermediate arc portion 8 are respectively connected to the inner ring portion 6 and the outer periphery. It is integrally connected to the ring portion 7 (see, for example, Patent Documents 1 and 2).
Japanese Patent No. 3375233 JP 2003-9495 A

  In the above-described conventional vibration generator, vibration is generated in the mover by energizing the coil, and the generated vibration is transmitted to the housing via a leaf spring. As a result, a large stress (load) due to the vibration acts directly and repeatedly on the leaf spring itself, and this stress affects the durability of the leaf spring and the vibration characteristics of the vibration generator. Therefore, the structure of the leaf spring itself may be deformed in order to relax and remove the stress acting on the fixed portion of the leaf spring. For example, the rounded portion (see reference numeral 9A in FIG. 8) on the end side of the slit opened in the leaf spring may be formed large.

  In this way, when the rounded portion on the end side of the slit is enlarged, not only is the processing step of the rounded portion increased and the productivity is lowered, but particularly when the vibration generator is downsized, The shape and dimensions of the slit radius must be precisely formed. Therefore, there is a problem in that high-level fine processing is required and strict processing accuracy management is required, resulting in a significant cost increase.

  Therefore, it is not necessary to add fine rounding to the leaf spring itself of the vibration generator, and it becomes unnecessary to strictly control the machining accuracy, and the stress acting on the fixed portion of the leaf spring is surely relaxed and removed. Therefore, a technical problem to be solved arises, and the present invention aims to solve the problem.

  The present invention has been proposed to achieve the above object, and the invention according to claim 1 comprises a housing having a bottom case, a magnet disposed in the housing, and a magnet and a movable portion yoke. A mover, an annular leaf spring interposed between the movable part yoke and the housing, and a driving coil fixed to the bottom case, are generated in the mover by energizing the coil. In the vibration generator configured to transmit the generated vibration to the housing via the leaf spring, a relief portion is provided at a position corresponding to the fixed portion of the leaf spring in the mover yoke and / or the housing. Provided is a vibration generator that is configured to be recessed and to relieve and remove stress acting on the fixed portion of the leaf spring by the relief portion.

  According to this configuration, since the escape portion is recessed in the fixed portion of the leaf spring in the mover yoke and / or the housing, even if stress is repeatedly applied to the leaf spring continuously with the vibration of the mover. The repetitive stress is relaxed and removed by the escape portion. For this reason, unlike the prior art, it is not necessary to perform a round process or the like for relaxing and removing the repeated stress on the leaf spring itself.

  According to a second aspect of the present invention, the annular leaf spring has an intermediate arc portion as a vibration deformation portion between an inner ring portion and an outer ring portion, and one end portion and the other end portion of the intermediate arc portion. 2. The vibration generating device according to claim 1, wherein the vibration generating device is connected to the inner ring portion and the outer ring portion, and the relief portion is recessed at a position corresponding to one end portion of the intermediate arc portion in the movable portion yoke. provide.

  According to this configuration, the relief portion is recessed in the portion corresponding to the one end portion of the intermediate arc portion in the movable portion yoke, that is, the inner peripheral side root portion where the repeated stress acts directly, so that the repeated stress is reduced. The removal effect is exhibited most efficiently.

  According to a third aspect of the present invention, the annular leaf spring has an intermediate arc part as a vibration deforming part inside the outer ring part, and the other end of the intermediate arc part is connected to the outer ring part. The vibration generating device according to claim 1, wherein the relief portion is recessed at a position corresponding to the other end portion of the intermediate arc portion in the housing.

  According to this configuration, the relief portion is recessed in the portion corresponding to the other end portion of the intermediate arc portion in the casing, that is, the outer peripheral side root portion where the repeated stress directly acts. Is most efficiently demonstrated.

  According to a fourth aspect of the present invention, a plurality of the intermediate arc portions are formed in the leaf spring, and the intermediate arc portions are arranged at equal intervals in the circumferential direction of the leaf spring. A vibration generator is provided.

  According to this configuration, since the plurality of intermediate arc portions are arranged at equal intervals along the circumferential direction of the leaf spring, the relieving action of repetitive stress acting on the fixed portion of the intermediate arc portion is It is performed simultaneously at a plurality of rotationally symmetric locations with respect to the center of the leaf spring.

  The invention described in claim 1 eliminates the need for a forming process (such as a rounding process) that acts on the leaf spring and relaxes and removes stress, so that the number of processing steps is reduced compared to the conventional case, and the productivity of the vibration generator is increased. Can be improved.

  In particular, even when the vibration generator is downsized, it is not necessary to form the slit shape of the leaf spring by advanced fine processing as in the past, and it is also necessary to strictly control the processing accuracy of the leaf spring. Therefore, the cost can be greatly reduced.

  According to the second aspect of the present invention, since the relief portion is recessed in the fixed portion of the leaf spring where the stress directly acts on the movable portion yoke, the relaxation removing action against the stress is efficiently exhibited. In addition to the effects of the present invention, the influence of the stress on the housing can be most effectively prevented, and the vibration characteristics and the life performance of the vibration generator as a product can be further improved as compared with the conventional case.

  In the invention according to claim 3, since the relief portion is recessed at the root portion of the vibration deformation portion of the leaf spring on which the stress directly acts on the housing, the relaxation removing action against the stress is efficiently exhibited. In addition to the effect of the invention according to Item 1 or 2, it is possible to most effectively prevent the stress from affecting the housing, and therefore, the stress relaxation and removal effect can be more remarkably exhibited. Further improvements are made.

  In the invention described in claim 4, since the relieving and removing action of the repeated stress is simultaneously performed at a plurality of rotationally symmetric positions with respect to the center of the leaf spring, in addition to the effect of the invention described in claim 2 or 3, The effect of relieving and removing the repeated stress can be exhibited more evenly over the entire leaf spring.

  The present invention relaxes and removes the stress acting on the fixed portion of the leaf spring without performing molding processing on the leaf spring and without requiring strict control of the machining accuracy, thereby improving reliability and life. In order to achieve the object of providing an excellent vibration generator at low cost, a casing having a bottom case, a mover disposed in the casing and comprising a magnet and a movable part yoke, and the movable part An annular leaf spring interposed between the yoke and the housing and a driving coil fixed to the bottom case, and vibration generated in the mover by energizing the coil via the leaf spring In the vibration generating device to be transmitted to, the relief portion is recessed at a position corresponding to the fixed portion of the leaf spring in both or one of the mover yoke and the housing, and the relief portion serves as a fixed portion of the leaf spring. By relaxing and removing the acting stress It was achieved.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. In the present embodiment, a movable body composed of a magnet and a movable part yoke is elastically supported via a leaf spring in a housing in which a bottom case and a cover, which are stators, are integrally coupled, and the upper surface of the bottom case is for driving. The present invention is applied to a vibration generating device in which a coil is fixed, and an arcuate vibration deforming portion (intermediate arc portion) is formed through a slit in a radial intermediate portion of a leaf spring, and a housing and a movable portion yoke ( In the upper yoke), a relief portion is recessed at a fixed portion corresponding to the root portion of the vibration deformation portion, and the relief portion can be configured to relax and remove stress acting on the root portion of the vibration deformation portion of the leaf spring. It is.

  With this configuration, it is possible to prevent the occurrence of torsion, bending deformation, distortion deformation, or the like in the vibration deformation portion of the leaf spring due to stress, and it is not necessary to perform round processing or strict machining management on the leaf spring itself, and a stable plate The spring characteristics are maintained over a long period of time, and the product life is extended.

  1 is a perspective view of a 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, FIG. 4 is a plan view of a leaf spring of the vibration generator, FIG. 5 is a perspective view showing the inside of the movable part yoke of the vibration generator, and FIG. 6 is a perspective view showing the inside of the casing of the vibration generator.

  In the figure, reference numeral 11 denotes a housing of the vibration generator 10, which is formed by integrating a flat cylindrical cover 12 and a disk-shaped bottom case 13 with each other. A cylindrical coil 14 is provided at the center of the upper surface of the bottom case 13, and a lead wire (not shown) is connected to the drive 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. The disc-shaped magnet 17 is fixed to the upper back surface of the first movable portion yoke 16, and the disk-shaped second movable portion yoke (lower yoke) 18 is fixed to the lower surface of the magnet 17. Yes.

  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 according to the present embodiment, 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.

  Next, features of the present invention will be described. FIG. 5 is a perspective view of the lower surface opening of the first movable part yoke 16 as viewed from below. As shown in the figure, a ring-shaped protrusion 30 is projected on the inner diameter part of the lower surface opening of the first movable part yoke 16, and an annular leaf spring 19 is fitted and fixed to the ring-shaped protrusion 30. Yes. Further, a ring-shaped step surface 31 is formed on the outer periphery of the ring-shaped protrusion 30, and the upper surface of the inner ring portion 21 of the leaf spring 19 is in contact with the ring-shaped step surface 31 as shown in FIG. 3.

  Further, at one or a plurality of the ring-shaped stepped surfaces 31, three in the illustrated example, arc-shaped inner circumferential side relief portions 32 are recessed, and each inner circumferential side relief portion 32 is formed on the inner circumference of the leaf spring 19. This corresponds to the vibration starting point portion on the side, that is, the inner peripheral side root portions 23a, 24a, 25a of the intermediate arc portions 23, 24, 25. By providing the inner peripheral side relief portion 32, stress that repeatedly acts on the inner peripheral base portions 23a, 24a, and 25a of the intermediate arc portions 23, 24, and 25 during vibration of the leaf spring 19 can be relaxed and removed. It is configured.

  Therefore, even if stress acts on the inner peripheral side root portions 23a, 24a, 25a of the intermediate arc portions 23, 24, 25, the stress can be quickly released, so that the inner peripheral side root portions 23a, It is possible to reliably prevent deformation such as twisting, bending, or distortion from occurring in 24a and 25a.

  FIG. 6 is a perspective view of the lower surface opening of the cover 12 of the housing 11 as viewed from below. As shown in the figure, arc-shaped groove portions 33 are provided at a plurality of locations on the lower side wall of the cover 12 of the housing 11, and the outer peripheral portion of the leaf spring 19 is fitted and fixed to the arc-shaped groove portion 33. .

  Furthermore, one or more arc-shaped outer peripheral side relief portions 34 are recessed at predetermined positions of the arc-shaped groove portion 33. The outer circumferential side relief portion 34 corresponds to the vibration starting point portion on the outer circumferential side of the leaf spring 19, that is, the outer circumferential side root portions 23b, 24b, 25b of the intermediate arc portions 23, 24, 25. By providing the outer circumferential side relief portion 34, it is possible to relax and remove stress that repeatedly acts on the outer circumferential side root portions 23b, 24b, 25b of the intermediate arc portions 23, 24, 25 when the leaf spring 19 vibrates. ing.

  Therefore, even if stress is applied to the outer peripheral side base portions 23b, 24b, 25b of the intermediate arc portions 23, 24, 25, the stress can be quickly released, so that the outer peripheral side base portions 23b, 24b, It is possible to reliably prevent deformation such as twisting, bending, or distortion by 25b.

  Further, even if a large stress acts intensively on the inner peripheral side root portions 23a, 24a, 25a and the outer peripheral side root portions 23b, 24b, 25b of the intermediate arc portions 23, 24, 25, the stresses are not affected. Since it is relaxed and removed directly and effectively by 32, 34, the long life and reliability of the leaf spring 19 are further improved.

  Further, in order to relax and remove the stress acting on the fixed portion of the leaf spring 19, in the prior art, it is necessary to perform a shaping process on the leaf spring 19 itself, for example, a large rounding process on the ends of the slits 26, 27, and 28. However, in the present invention, since rounding or the like is unnecessary, the production efficiency of the vibration generator 10 is greatly improved. In particular, even when the vibration generator 10 is downsized, it is not necessary to perform advanced micromachining on the leaf spring 19, and at the same time, strict machining accuracy management is not required, and the cost can be greatly reduced. .

  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. The top view of the leaf | plate spring of the vibration generator of FIG. The perspective view of the movable part yoke of the vibration generator of FIG. The perspective view of the cover of the housing | casing of the vibration generator of FIG. 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.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vibration generator 11 Case 12 Cover 13 Bottom case 14 Coil 15 Movable element 16 1st movable part yoke (upper yoke)
17 Magnet 18 Second movable part yoke (lower yoke, stator)
19 Leaf spring (diaphragm)
21 inner ring part 22 outer ring part 23, 24, 25 intermediate arc part 23a, 24a, 25a inner peripheral base part 23b, 24b, 25b outer peripheral base part 26, 27, 28 slit 26a, 27a, 28a inner peripheral arc 26b, 27b, 28b Outer circular arc part 26c, 27c, 28c Central communication part 32 Inner peripheral side relief part 34 Outer peripheral side relief part

Claims (4)

A housing having a bottom case, a mover that is disposed in the housing and includes a magnet and a movable portion yoke, an annular leaf spring interposed between the movable portion yoke and the housing, A vibration generating device comprising: a driving coil fixed to the bottom case, and configured to transmit vibration generated in the mover to the casing through the leaf spring by energizing the coil. In
A relief portion is recessed in a portion corresponding to the fixed portion of the leaf spring in the mover yoke and / or the housing, and the relief portion is configured to relax and remove stress acting on the fixed portion of the leaf spring. The vibration generator characterized by having performed.   The annular leaf spring has an intermediate arc portion as a vibration deforming portion outside the inner ring portion, one end of the intermediate arc portion is connected to the inner ring portion, and the movable portion yoke 2. The vibration generator according to claim 1, wherein the relief portion is recessed at a location corresponding to one end of the intermediate arc portion.   The annular leaf spring has an intermediate arc portion as a vibration deforming portion inside the outer ring portion, and the other end portion of the intermediate arc portion is connected to the outer ring portion, and the intermediate arc in the casing The vibration generating device according to claim 1, wherein the relief portion is recessed at a position corresponding to the other end portion of the portion.   4. The vibration generation according to claim 2, wherein a plurality of the intermediate arc portions are formed in the leaf spring, and the intermediate arc portions are arranged at equal intervals in a circumferential direction of the leaf spring. apparatus.

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