JP2012065868A - Electric shaver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric shaver for accurately reducing an uncomfortable feeling to be given to a user by actuation sound.SOLUTION: The electric shaver 1 includes: blade blocks 4-7 having inner blades where a plurality of blade pieces are arrayed along a width direction Y and outer blades arranged to cover the plurality of blade pieces from an outer side; a drive device for reciprocatively moving the inner blades in the width direction Y with respect to the outer blades; and also a housing 8 covering the side surfaces of the blade blocks 4-7 and positioned on the outermost side of the electric shaver 1. In the housing 8, wall parts extending in the width direction Y are defined as first wall parts 81, and wall parts extending in a front and rear direction X to be orthogonally crossed with the width direction Y are defined as second wall parts 85. The thickness t2 of each second wall part 85 constituting the housing 8 is smaller than the thickness t1 of each first wall part 81 as a whole.

Description

  The present invention relates to a reciprocating electric shaver.

  Conventionally, as this type of electric shaver, for example, there is one described in Patent Document 1. The conventional general electric razor including the electric razor described in Patent Document 1 includes an inner blade portion in which a plurality of substantially U-shaped blade pieces are arranged in a predetermined direction, and an inner blade portion from the outside. An outer blade portion provided to cover and a drive portion that reciprocates the inner blade portion in the predetermined direction. And the scissors introduced into the inside through the outer blade part are cut | disconnected by being pinched by the blade edge | tip of the blade piece which comprises the outer blade part and an inner blade part.

  Here, in such an electric razor, by urging the inner blade portion toward the outer blade portion by a spring or the like, the outer periphery of the inner blade portion and the inner periphery of the outer blade portion are maintained close to each other. This makes it possible to cut shorter ridges. At the same time, the drive unit and the inner blade part are connected to the drive unit and can swing on the opposite side of the outer blade part with a predetermined degree of freedom across the inner blade part. Is provided with a support portion. Thereby, it is suppressed that the outer periphery of an inner blade part will be maintained in the state where one part hits with respect to the inner periphery of an outer blade part.

  By the way, in such an electric razor, there exists a possibility of giving a user discomfort by the operation sound. On the other hand, for example, in the conventional electric razor described in Patent Document 2, an elastic coating layer is formed on the inner wall of the transmission chamber that houses the eccentric cam and the vibrator that converts the rotational output of the motor into a reciprocating linear motion. ing. Thereby, the sound pressure of the operating sound of the eccentric cam and the vibrator is reduced.

JP 2008-142274 A JP-A-63-318988

  By the way, as described above, the discomfort given to the user can be reduced to some extent by reducing the sound pressure of the operating sound generated from the electric razor. However, the operating sound of an electric razor has a frequency range in which the user feels uncomfortable and a frequency range in which the user feels uncomfortable. Therefore, the conventional electric noise which simply reduces the sound pressure level of the operating sound is not considered. In the case of the razor, there is still room for improvement in reducing the discomfort given to the user accurately.

  This invention is made | formed in view of such a situation, The objective is to provide the electric shaver which can reduce the discomfort given to a user due to an operating sound exactly.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
An electric razor according to the present invention includes a blade block having an inner blade portion in which a plurality of blade pieces are arranged in a predetermined direction, and an outer blade portion provided so as to cover the plurality of blade pieces from the outside thereof. An electric razor comprising: a drive portion that reciprocates the inner blade portion in the predetermined direction with respect to the outer blade portion; and a housing that covers a side surface of the blade block and is located on the outermost side of the electric razor. When the wall portion extending along the predetermined direction in the housing is the first wall portion and the wall portion extending in the direction orthogonal to the predetermined direction is the second wall portion, the housing is the second wall portion. The wall portion has a rigidity difference structure in which the rigidity of the wall portion is lower than that of the first wall portion.

In this electric razor, it is preferable that the rigidity difference structure adopts an aspect in which the thickness of the second wall portion is made smaller than the thickness of the first wall portion.
In this case, it is preferable that the electric razor adopt an aspect in which the thickness of the second wall portion is made smaller than the thickness of the first wall portion as a whole.

Moreover, in this electric shaver, it is preferable to employ a mode in which a thin portion thinner than other portions of the second wall portion is formed on a part of the second wall portion.
In this case, in this electric razor, a plurality of the blade blocks are arranged in parallel along a direction orthogonal to the predetermined direction, and the plurality of blade blocks have a mesh-like outer blade portion composed of a mesh-like outer blade. Including a reticulated blade block and a slit-shaped blade block having a slit-shaped outer blade portion formed of a slit-shaped outer blade, wherein the thin portion is formed on the reticulated outer blade portion in a direction orthogonal to the predetermined direction. It is preferable to adopt an aspect in which the film is formed at a corresponding position.

  In this electric razor, it is preferable that the rigidity difference structure adopts an aspect in which the material constituting the second wall portion is made to have a lower rigidity than the material constituting the first wall portion.

  In this case, it is preferable that the electric razor adopts an aspect in which the material constituting the second wall portion has a lower rigidity as a whole than the material constituting the first wall portion.

  Further, in this electric razor, a mode is adopted in which a part of the second wall part is formed with a low-rigidity material part made of a material having a lower rigidity than other parts of the second wall part. It is preferable to do.

  In this case, in this electric razor, a plurality of the blade blocks are arranged in parallel along a direction orthogonal to the predetermined direction, and the plurality of blade blocks have a mesh-like outer blade portion composed of a mesh-like outer blade. A mesh-like blade block, and a slit-like blade block having a slit-like outer blade portion made of a slit-like outer blade, wherein the low-rigidity material portion is the mesh-like outer blade in a direction orthogonal to the predetermined direction. It is preferable to adopt an aspect in which the portion is formed at a position corresponding to the portion.

  Further, in this electric razor, a mode is adopted in which a part of the first wall part is formed with a high rigidity material part formed of a material having higher rigidity than other parts of the first wall part. It is preferable to do.

  ADVANTAGE OF THE INVENTION According to this invention, the electric shaver which can reduce the discomfort given to a user due to an operating sound exactly can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS About 1st Embodiment of the electric razor which concerns on this invention, (a) The perspective view which shows the perspective structure of an electric razor, (b) The perspective view which shows the perspective structure of the head part of an electric razor. It is sectional drawing which shows the longitudinal cross-section structure centering on the outer blade part and the inner blade part about the electric shaver of 1st Embodiment, Comprising: (a) Sectional drawing which shows the state in which an inner blade part exists in a neutral position, (b ) Cross-sectional view showing a state where the inner blade portion is at one end of the reciprocating vibration range. Sectional drawing about the cross-sectional structure centering on the housing of 1st Embodiment. Sectional drawing about the cross-sectional structure centering on the housing of 2nd Embodiment. Sectional drawing about the cross-sectional structure centering on the housing of 3rd Embodiment. Sectional drawing about the cross-sectional structure centering on the housing of 4th Embodiment. Sectional drawing about the cross-sectional structure centering on the housing of 5th Embodiment. Sectional drawing about the cross-sectional structure centering on the housing of 6th Embodiment. Sectional drawing about the cross-sectional structure centering on the housing of 7th Embodiment.

<First Embodiment>
Hereinafter, a first embodiment in which an electric razor according to the present invention is embodied as a shaver electric razor will be described with reference to FIGS.

FIG. 1A shows a perspective structure of an electric razor according to this embodiment. FIG. 1B is an enlarged perspective view of the head portion of the electric razor.
As shown in FIG. 1A, the electric razor 1 includes a grip portion 2 that can be gripped by a user, and a head portion 3 connected to one end of the grip portion 2.

A battery (not shown) for supplying power to the drive device 9 is provided inside the grip portion 2.
As shown in FIG. 1B, the head portion 3 covers four blade blocks 4 to 7 each having an outer blade portion and an inner blade portion, and covers the side surfaces of these blade blocks 4 to 7 and also the electric razor 1. And an outermost housing 8.

  Further, the head unit 3 is provided with a driving device 9 for reciprocally vibrating these inner blade portions in a predetermined direction. The drive device 9 includes a linear motor 91 that reciprocally vibrates the inner blade portion 45 14000 times per minute (see FIG. 2 for the drive device 9 and the linear motor 91). When the operation switch 10 provided on the outer surface of the grip portion 2 is turned on, power is supplied from the battery and the linear motor 91 is activated to drive the drive device 9.

  In the following, the shaving direction of the electric shaver 1 will be referred to as “front-rear direction X”, and the direction perpendicular to the front-rear direction X and extending the blade blocks 4 to 7 will be referred to as “width direction Y”. A direction orthogonal to both the direction X and the width direction Y is referred to as “vertical direction Z”. The width direction Y corresponds to the predetermined direction in the present invention.

  The four blade blocks 4 to 7 are juxtaposed in the front-rear direction X at the top of the head portion 3 and are configured as a so-called four-blade electric shaver 1. Specifically, the first mesh blade block 4, the second mesh blade block 5, and the third mesh blade block 6 each have an outer blade portion formed of a mesh-like outer blade. . Here, the first mesh blade block 4 and the second mesh blade block 5 are respectively arranged at both ends of the four blade blocks 4 to 7 in the front-rear direction X, and the third mesh blade block 6 is These blade blocks 4 and 5 are arranged close to the first mesh blade block 4. The slit blade block 7 has an outer blade portion formed of a slit-shaped outer blade, and is disposed between the second mesh blade block 5 and the third mesh blade block 6. .

Here, with reference to FIG. 2, the longitudinal cross-sectional structure of the 1st mesh blade block 4 is demonstrated.
FIG. 2 shows a longitudinal sectional structure of the first mesh blade block 4. 2A shows a state in which the inner blade portion 45 is in the neutral position, and FIG. 2B shows a state in which the inner blade portion 45 is at one end in the reciprocating vibration range. In FIG. 2, the center line in the width direction Y of the outer blade portion 41 is indicated by a one-dot chain line C1, and the center line in the width direction Y of the inner blade portion 45 is indicated by a two-dot chain line C2. Since the second mesh blade block 5 has basically the same structure as the first mesh blade block 4, the description of the second mesh blade block 5 is omitted.

  As shown in FIG. 2A, the inner blade portion 45 is formed by arranging a plurality of blade pieces 46 having a substantially U shape along the width direction Y at equidistant intervals. Are connected to the connecting portion 48 on the base end side thereof. The outer blade portion 41 has a substantially U-shaped cross section and has a shape that covers the inner blade portion 45 from the outside. Further, the inner periphery of the outer blade portion 41 and the outer periphery of the inner blade portion 45 are curved in the width direction Y, respectively. Specifically, the curvature radius R2 of the outer periphery of the inner blade portion 45 is made smaller than the curvature radius R1 of the inner periphery of the outer blade portion 41. That is, the tips of the plurality of blade pieces 46 of the inner blade portion 45 are positioned on an arc.

  In addition, the drive device 9 includes a support portion 92 provided between the inner blade portion 45 and the output portion of the linear motor 91 and at the center position of the inner blade portion 45 in the width direction Y. The inner blade portion 45 is supported so as to be swingable with a predetermined degree of freedom. Specifically, it is supported so as to be swingable along a plane parallel to both the width direction Y and the vertical direction Z. Further, a spring 93 is provided between the support portion 92 and the inner blade portion 45 to bias the inner blade portion 45 upward, that is, toward the outer blade portion 41. By maintaining the outer periphery of the inner blade portion 45 and the inner periphery of the outer blade portion 41 in proximity to each other by the biasing force of the spring 93, it is possible to cut a shorter ridge. Further, since the inner blade portion 45 is supported by the support portion 92 so as to be swingable with a predetermined degree of freedom, the outer periphery of the inner blade portion 45 is maintained in a state where the outer periphery of the inner blade portion 45 comes into contact with the inner periphery of the outer blade portion 41. It has come to be suppressed.

  Although illustration is omitted here, inside the head portion 3, inner blade portions are provided corresponding to the outer blade portions constituting the third mesh blade block 6 and the slit blade block 7, respectively. Yes.

  According to the electric shaver 1 having such a configuration, when the inner blade portion reciprocally vibrates by the driving device 9 (linear motor 91), the wrinkles introduced into the outer blade portion are separated by the blade pieces constituting the inner blade portion. The scissors are excised by pinching.

  By the way, the sound generated by the operation of the electric shaver 1 includes a low frequency sound and a high frequency sound. Here, as shown in FIG. 2B, when the inner blade portion 45 reciprocates by the linear motor 91, one end of the inner blade portion 45 may interfere with the inner periphery of the outer blade portion 41. Since both the inner blade portion 45 and the outer blade portion 41 are made of stainless steel, that is, a highly rigid material, they interfere with each other to generate a high-frequency sound (specifically, 2 kHz or more), a so-called high-pitched sound. Will occur.

This time, it has been found by the inventors that, among the operating sounds generated from the electric razor 1, when the sound pressure of such high frequency components is relatively high, the user is greatly discomforted.
Therefore, in the present embodiment, the housing 8 has a rigidity difference structure that will be described in detail below, so that the discomfort given to the user due to the operating sound can be reduced accurately.

FIG. 3 shows a cross-sectional structure around the housing 8.
As shown in FIG. 3, the housing 8 has a frame shape with a substantially rectangular cross section.
Hereinafter, the pair of wall portions extending along the width direction Y in the housing 8 will be referred to as a first wall portion 81, and the pair of wall portions extending in the front-rear direction X will be referred to as a second wall portion 85.

  As shown in FIG. 3, the first wall portion 81 and the second wall portion 85 have a uniform thickness, and the thickness t2 of the second wall portion 85 is larger than the thickness t1 of the first wall portion 81. It is made small (t1> t2). That is, the housing 8 has a rigidity difference structure in which the rigidity of the second wall portion 85 is lower than the rigidity of the first wall portion 81.

  The sound generated with the reciprocating motion of the inner blade portion 45 basically propagates along the width direction Y, which is the reciprocating direction. In the present embodiment, the rigidity of the second wall portion 85 positioned ahead in the propagation direction is lower than the rigidity of the first wall portion 81. Here, when the rigidity of the second wall portion 85 is lowered, sound is likely to propagate through the second wall portion 85, but the sound pressure of the high frequency component is likely to attenuate compared to the sound pressure of the low frequency component. Compared with the conventional general configuration in which the rigidity of the second wall part is the same as that of the first wall part, the sound pressure of the low frequency component propagating through the second wall part 85 (driving the linear motor 91) The frequency (233 Hz) is relatively large with respect to the sound pressure of the high frequency component (2 kHz or more).

According to the electric shaver according to the present embodiment described above, the following effects can be obtained.
(1) In the present embodiment, the electric razor 1 includes a housing 8 that covers the side surfaces of the plurality of blade blocks 4 to 7 and is located on the outermost side of the electric razor 1, and a second wall portion that constitutes the housing 8. The thickness t2 of 85 is assumed to be smaller than the thickness t1 of the first wall portion 81 as a whole. That is, the housing 8 has a rigidity difference structure in which the rigidity of the second wall portion 85 is made lower than the rigidity of the first wall portion 81. Thereby, compared with the conventional general structure which makes the rigidity of the 2nd wall part the same as the rigidity of the 1st wall part, the sound pressure (linear motor 91) of the low frequency component which propagates through the 2nd wall part 85 is propagated. The driving frequency of 233 Hz) can be increased relative to the sound pressure of the high frequency component (2 kHz or higher). Therefore, the discomfort given to the user due to the operating sound can be accurately reduced.

  (2) In the present embodiment, the thickness t2 of the second wall portion 85 is made smaller than the thickness t1 of the first wall portion 81 as a whole, whereby the rigidity of the second wall portion 85 is increased. It is assumed to be lower than the rigidity. Therefore, the thickness of the second wall portion 85 can be easily made smaller than the thickness of the first wall portion 81, and the rigidity difference structure can be easily realized.

Second Embodiment
Hereinafter, a second embodiment of the electric shaver according to the present invention will be described with reference to FIG.
In the present embodiment, the thicknesses of the first wall portion 281 and the second wall portion 285 constituting the housing 208 are basically the same, while the thin portions 286 and 287 are partially provided on the second wall portion 285. This is different from the first embodiment. Further, since the other configuration is the same as the configuration of the first embodiment, a duplicate description is omitted.

FIG. 4 shows a cross-sectional structure around the housing 208.
Like this embodiment, the four blade blocks 4-7 are arranged in parallel along the front-back direction X, and these blade blocks 4-7 have the mesh-shaped outer blade part 41 which consists of a mesh-shaped outer blade. In the case of including the blocks 4 to 6 and the slit-like blade block 7 having the slit-like outer blade portion made of the slit-like outer blade, the first and second mesh blade blocks 4 and 5 are included. The sound pressure at a high frequency (2 kHz or higher) generated due to interference between the mesh-shaped outer blade portion 41 and the inner blade portions is a particular problem. As described above, the inner blade portions constituting the first and second mesh blade blocks 4 and 5 are supported by the support portion 92 only at the center position in the width direction Y. This is because the amount of rocking of the part is larger than that of the other inner blade part, and this causes the degree of interference between the outer blade part and the inner blade part to be large, and the sound pressure of the high-frequency component is particularly large. is there.

  As shown in FIG. 4, the first wall portion 281 and the second wall portion 285 basically have a predetermined thickness t1. However, thin portions 286 and 287 having a thickness t3 smaller than other portions of the second wall portion 285 are formed in a part of the second wall portion 285. Specifically, the thin portions 286 and 287 are formed at positions corresponding to the outer blade portion 41 in the front-rear direction X. That is, the housing 208 has a rigidity difference structure in which the rigidity of the second wall portion 285 is lower than the rigidity of the first wall portion 281.

According to the electric shaver according to the present embodiment described above, the following effects can be obtained.
(3) In the present embodiment, thin portions 286 and 287 that are thinner than other portions of the second wall portion 285 are formed in a part of the second wall portion 285. Specifically, the thin-walled portions 286 and 287 are formed at positions corresponding to the outer blade portion 41 in the front-rear direction X. Thereby, the attenuation of the sound pressure at the drive frequency (233 kHz) can be accurately suppressed, and the sound pressure at the low frequency is relatively increased with respect to the sound pressure at the high frequency (2 kHz or higher) among the propagating sounds. Will be able to. In addition, since the other portion of the second wall portion 285 has the same thickness t1 as that of the first wall portion 281, an unnecessary reduction in rigidity of the second wall portion 285 can be accurately suppressed. Become.

<Third Embodiment>
Hereinafter, a third embodiment of the electric shaver according to the present invention will be described with reference to FIG.
In the present embodiment, the thicknesses of the first wall portion 381 and the second wall portion 385 constituting the housing 308 are basically the same, while the thick portion 384 is partially provided on the first wall portion 381. This is different from the first embodiment. Further, since the other configuration is the same as the configuration of the first embodiment, a duplicate description is omitted.

FIG. 5 shows a cross-sectional structure around the housing 308.
In the present embodiment, as shown in FIG. 5, the first wall portion 381 and the second wall portion 385 basically have a predetermined thickness t1. However, a thick portion 384 having a thickness t4 larger than other portions of the first wall portion 381 is formed in a part of the first wall portion 381. Specifically, the thick portion 384 is formed in such a manner that the center position in the width direction Y protrudes outward. That is, the housing 308 has a rigidity difference structure in which the rigidity of the first wall portion 381 is higher than the rigidity of the second wall portion 385.

According to the electric shaver according to the present embodiment described above, the following effects can be obtained.
(4) In the present embodiment, a thick part 384 that is thicker than other parts of the first wall 381 is formed in a part of the first wall 381. Specifically, the thick portion 384 is formed at the center position in the width direction Y. As described above, since the rigidity of the first wall portion 381 is higher than the rigidity of the second wall portion 385, the rigidity of the first wall portion is compared with the conventional general configuration in which the rigidity of the first wall portion is the same as that of the second wall portion. Thus, the sound pressure of a high frequency (2 kHz or more) transmitted from the second wall portion 385 to the first wall portion 381 and propagating through the first wall portion 381 is suitably attenuated. This makes it possible to relatively reduce the sound pressure at a high frequency relative to the sound pressure at the drive frequency (233 Hz) among the propagating sounds. Therefore, the discomfort given to the user due to the operating sound can be accurately reduced.

<Fourth embodiment>
Hereinafter, with reference to FIG. 6, 4th Embodiment of the electric shaver which concerns on this invention is described.
In the present embodiment, the first wall portion 481 and the second wall portion 485 constituting the housing 408 have the same thickness, and the material constituting the second wall portion 485 constitutes the first wall portion 481 as a whole. The difference from the first embodiment is that the material has a lower rigidity than the material. Further, since the other configuration is the same as the configuration of the first embodiment, a duplicate description is omitted.

FIG. 6 shows a cross-sectional structure around the housing 408.
In the present embodiment, as shown in FIG. 6, the first wall portion 481 and the second wall portion 485 have a predetermined thickness t1. However, the entire first wall portion 481 is formed of a resin material, specifically, a plastic material, while the entire second wall portion 485 is formed of a rubber material having rigidity lower than that of the plastic material. That is, the housing 408 has a rigidity difference structure in which the rigidity of the second wall portion 485 is lower than the rigidity of the first wall portion 481.

According to the electric shaver according to the present embodiment described above, the following effects can be obtained.
(5) In the present embodiment, the material constituting the second wall portion 485 is lower in rigidity than the material constituting the first wall portion 481 as a whole. Specifically, the entire first wall portion 481 is formed of a plastic material, while the entire second wall portion 485 is formed of a rubber material. That is, the housing 408 has a rigidity difference structure in which the rigidity of the second wall portion 485 is lower than the rigidity of the first wall portion 481. As a result, both the first wall portion and the second wall portion are formed of a plastic material and propagate through the second wall portion 485 as compared with the conventional general configuration in which the rigidity of these wall portions is the same. The sound pressure at the drive frequency (233 Hz) can be relatively increased with respect to the sound pressure at the high frequency component (2 kHz or higher). Therefore, the discomfort given to the user due to the operating sound can be accurately reduced.

  (6) In this embodiment, instead of providing a difference in the thickness of the first wall 481 and the second wall 485, the materials constituting the first wall 481 and the second wall 485 have different rigidity. Thus, the rigidity difference structure is realized. For this reason, it is not necessary to change the physique of the housing 408 in order to realize the rigidity difference structure, and the appearance of the electric shaver 1, that is, the design property is not impaired.

<Fifth Embodiment>
Hereinafter, a fifth embodiment of the electric shaver according to the present invention will be described with reference to FIG.
In the present embodiment, the first wall portion 581 and the second wall portion 585 constituting the housing 508 have the same thickness, while the material constituting the first wall portion 581 constitutes the second wall portion 585 as a whole. It differs from the first embodiment in that it is higher in rigidity than the material. Further, since the other configuration is the same as the configuration of the first embodiment, a duplicate description is omitted.

FIG. 7 shows a cross-sectional structure around the housing 508.
In the present embodiment, as shown in FIG. 7, the first wall portion 581 and the second wall portion 585 have a predetermined thickness t1. However, the entire first wall portion 581 is formed of a metal material, specifically, an aluminum alloy, while the entire second wall portion 585 is formed of a plastic material. That is, the housing 508 has a rigidity difference structure in which the rigidity of the first wall portion 581 is higher than the rigidity of the second wall portion 585.

According to the electric shaver according to the present embodiment described above, the following effects can be obtained.
(7) In the present embodiment, the entire first wall portion 581 is formed of an aluminum alloy, while the entire second wall portion 585 is formed of a plastic material. That is, the housing 508 has a rigidity difference structure in which the rigidity of the first wall portion 581 is higher than the rigidity of the second wall portion 585. Thereby, both the first wall portion and the second wall portion are formed of a plastic material, and compared with the conventional general configuration in which the rigidity of these wall portions is the same, the second wall portion 585 to the first wall portion 581 are compared. Therefore, the sound pressure of high frequency (2 kHz or more) propagating through the first wall portion 581 is suitably attenuated. This makes it possible to relatively reduce the sound pressure at a high frequency relative to the sound pressure at the drive frequency (233 Hz) among the propagating sounds. Therefore, the discomfort given to the user due to the operating sound can be accurately reduced.

  (8) In this embodiment, the thickness of the first wall portion 581 and the second wall portion 585 is not different, but the materials constituting the first wall portion 581 and the second wall portion 585 are different in rigidity. Thus, the rigidity difference structure is realized. For this reason, it is not necessary to change the physique of the housing 508 in order to realize the rigidity difference structure, and the appearance of the electric shaver 1, that is, the design property is not impaired.

<Sixth Embodiment>
Hereinafter, a sixth embodiment of the electric shaver according to the present invention will be described with reference to FIG.
In this embodiment, the second wall portion is not entirely formed of a low rigidity material, but is different from the fourth embodiment in that a part of the second wall portion is formed of a low rigidity material. ing. Further, since the other configuration is the same as the configuration of the first embodiment, a duplicate description is omitted.

FIG. 8 shows a cross-sectional structure around the housing 608.
In the present embodiment, as shown in FIG. 8, the first wall portion 681 and the second wall portion 685 have a predetermined thickness t1. Further, the first wall portion 681 is formed of a resin material, specifically, a plastic material as a whole. The second wall portion 685 is basically formed of a plastic material in the same manner as the first wall portion 681. However, low rigidity material portions 686 and 687 made of a rubber material having rigidity lower than that of the plastic material are formed in a part of the second wall portion 685. Specifically, the low-rigidity material portions 686 and 687 are formed at positions corresponding to the outer blade portion 41 in the front-rear direction X, and are formed on the entire second wall portion 685 in the width direction Y. That is, the housing 608 has a rigidity difference structure in which the rigidity of the second wall portion 685 is lower than the rigidity of the first wall portion 681.

According to the electric shaver according to the present embodiment described above, the following effects can be obtained.
(8) In the present embodiment, it is assumed that low rigidity material portions 686 and 687 formed of a material having lower rigidity than other portions of the second wall portion 685 are formed in a part of the second wall portion 685. Yes. Specifically, the low-rigidity material portions 686 and 687 are formed at positions corresponding to the outer blade portion 41 in the front-rear direction X. Thereby, the attenuation of the sound pressure at the drive frequency (233 kHz) can be accurately suppressed, and the sound pressure at the low frequency is relatively increased with respect to the sound pressure at the high frequency (2 kHz or higher) among the propagating sounds. Will be able to. In addition, since the other portion of the second wall portion 685 is formed of the same material (plastic material) as the first wall portion 681, it is possible to accurately suppress unnecessary rigidity reduction of the second wall portion 685. Will be able to.

<Seventh embodiment>
Hereinafter, a seventh embodiment of the electric shaver according to the present invention will be described with reference to FIG.
In the present embodiment, the entire first wall portion is not formed of a highly rigid material, but is different from the previous fifth embodiment in that a portion of the first wall portion is formed of a highly rigid material. ing. Further, since the other configuration is the same as the configuration of the first embodiment, a duplicate description is omitted.

FIG. 9 shows a cross-sectional structure around the housing 708.
In the present embodiment, as shown in FIG. 9, the first wall portion 781 and the second wall portion 785 have a predetermined thickness t1. Further, the second wall portion 785 is formed of a resin material, specifically, a plastic material as a whole. Further, the first wall portion 781 is basically formed of a plastic material like the second wall portion 785. However, a high-rigidity material portion 784 formed of a metal material having a higher rigidity than the plastic material, specifically, an aluminum alloy is formed in a part of the first wall portion 781. The high-rigidity material portion 784 is formed at the center position in the width direction Y and is formed on the entire first wall portion 781 in the front-rear direction X. That is, the housing 708 has a rigidity difference structure in which the rigidity of the first wall portion 781 is partially increased.

According to the electric shaver according to the present embodiment described above, the following effects can be obtained.
(9) In the present embodiment, a high-rigidity material portion 784 formed of a material having higher rigidity than the material constituting the second wall portion 785 is formed in a part of the first wall portion 781. Thus, since the rigidity of the 1st wall part 781 is made higher than the rigidity of the 2nd wall part 785, it compares with the conventional general structure which makes the rigidity of a 1st wall part the same as the rigidity of a 2nd wall part. Thus, the sound pressure of a high frequency (2 kHz or more) transmitted from the second wall portion 785 to the first wall portion 781 and propagating through the first wall portion 781 is suitably attenuated. This makes it possible to relatively reduce the sound pressure at a high frequency relative to the sound pressure at the drive frequency (233 Hz) among the propagating sounds. Therefore, the discomfort given to the user due to the operating sound can be accurately reduced.

The electric razor according to the present invention is not limited to the configuration exemplified in each of the above embodiments, and can be implemented as, for example, the following forms appropriately modified.
In each of the above embodiments, the four-blade electric razor 1 is illustrated, but the present invention is not limited to this, and is applicable to an electric razor having one to three blades, or five or more blades. Is possible.

  In the second embodiment, the first mesh blade block 4 and the second mesh blade block 5 are illustrated as being disposed at both ends in the front-rear direction X. In addition, the housing 208 in which the thin portions 286 and 287 are formed at both ends in the front-rear direction X of the second wall portion 285 is illustrated. However, the present invention is not limited to this, and the arrangement position of the first mesh blade block 4 or the second mesh blade block 5 can be changed from the position of the second embodiment. In this case, the thin wall portion may be formed on the second wall portion corresponding to the position of the mesh blade block.

  In the third embodiment, only one thick portion 384 is formed at the center position in the width direction Y of the first wall portion 381, but instead, the width direction of the first wall portion is exemplified. A plurality of thick portions can also be formed along Y.

  In the fourth embodiment, the housing 408 in which the entire first wall portion 481 is formed of a plastic material while the entire second wall portion 485 is formed of a rubber material is illustrated. Instead of this, the second wall portion may be formed of a plastic material having a lower rigidity than the plastic material constituting the first wall portion 481.

  In the fifth embodiment, the first wall portion 581 is entirely formed of an aluminum alloy, while the second wall portion 585 is entirely formed of a plastic material. Alternatively, the first wall portion can be formed of brass or an iron-based material.

  In the sixth embodiment, the housing 608 in which the low-rigidity material portions 686 and 687 are formed at both end portions in the front-rear direction X of the second wall portion 685 is illustrated. However, the present invention is not limited to this, and when the arrangement position of the first mesh blade block 4 or the second mesh blade block 5 is changed, it corresponds to the position after the change. The thin portion may be formed.

  In the seventh embodiment, only one high-rigid material portion 784 is formed at the center position in the width direction Y of the first wall portion 781, but instead, the width of the first wall portion is exemplified. A plurality of high-rigidity material portions can also be formed along the direction Y.

  In each of the above embodiments, the inner blade portion 45 constituting the first mesh blade block 4 and the inner blade portion constituting the second mesh blade block 5 are supported only at the center position in the width direction Y. A structure supported by 92 was adopted. Such a support structure can also be applied to the inner blade portion constituting the third mesh blade block 6 or the inner blade portion constituting the slit blade block. However, in this case, the sound pressure at a high frequency (2 kHz or more) generated due to the interference between the outer blade portion constituting the third mesh blade block or the slit blade block and the inner blade portion is particularly problematic. It becomes. Therefore, in this case, for example, instead of the second embodiment, it is preferable to form a thin portion also at a position corresponding to the third mesh blade block or slit blade block. For example, instead of the sixth embodiment, it is preferable to form the low-rigidity material portion at a position corresponding to the third mesh blade block or the slit blade block.

  In each of the above embodiments, the pair of second wall portions have the same structure, but the present invention is not limited to this. For example, while adopting the second wall portion 85 exemplified in the first embodiment as one of the pair of second wall portions, adopting the second wall portion 285 exemplified in the second embodiment as the other. You can also. Moreover, the structure of the 2nd wall part illustrated in other embodiment can also be combined suitably.

  In each of the above embodiments, the pair of first wall portions have the same structure, but the present invention is not limited to this. For example, while adopting the 1st wall part 381 illustrated in 3rd Embodiment to one side of a pair of 1st wall parts, the 1st wall part illustrated in 5th Embodiment is employ | adopted about the other. it can. Moreover, the structure of the 2nd wall part illustrated in other embodiment can also be combined suitably.

  The driving unit according to the present invention is not limited to the driving device 9 including the linear motor 91. In addition, for example, a rotary motor can be employed. In this case, a conversion mechanism that converts the rotation of the output shaft of the rotary motor into a reciprocating linear motion may be employed.

  In each of the above embodiments, the inner and outer peripheries of the outer blade part and the outer periphery of the inner blade part are exemplified as having a shape curved in the width direction Y, but the present invention is not limited to this, and the outer blade part The present invention can be applied to a so-called straight-type electric shaver in which the inner and outer peripheries and the outer periphery of the inner blade portion are along the width direction Y.

  -In each above-mentioned embodiment, although illustrated about the structure which supports the inner blade part 45 by the support part 92 in the center position of the inner blade part 45 in the width direction Y, the support structure of the inner blade part which concerns on this invention is to this It is not limited, For example, you may support an inner blade part in the several position on both sides of the center position of an inner blade part. In short, what is necessary is just to support the inner blade portion in a swingable manner with a predetermined degree of freedom.

  In each of the above embodiments, by adopting a housing having a rigidity difference structure in which the rigidity of the second wall portion is made lower than the rigidity of the first wall portion as the housing, the rigidity of the second wall portion is reduced to that of the first wall portion. Compared to the conventional general configuration with the same rigidity, the sound pressure of the low frequency component propagating through the second wall portion is made relatively large with respect to the sound pressure of the high frequency component, so that the operation sound is reduced. As a result, discomfort to users is reduced. In addition to this, when the inner blade portion and the outer blade portion locally interfere with at least one of the inner blade portion and the outer blade portion due to the swing of the inner blade portion allowed by the support portion. The present inventor has found that providing a sound pressure reduction unit that reduces the pressure of the generated interference sound is effective in reducing the sound pressure of high frequency components. Incidentally, in this case, as the sound pressure reducing portion, for example, a relief portion formed on the inner blade portion or the outer blade portion to release the interference, an absorption portion that absorbs the impact force due to the interference through elastic deformation, or the like, It is desirable to employ a limiting unit that limits the propagation of vibration due to interference through elastic deformation or the like.

  DESCRIPTION OF SYMBOLS 1 ... Electric razor, 3 ... Head part, 4 ... 1st mesh blade block, 5 ... 2nd mesh blade block, 6 ... 3rd mesh blade block, 7 ... Slit blade block, 41 ... Outside Blade portion 45 ... Inner blade portion 46 ... Blade piece 47 ... Connection portion 8, 208, 308, 408, 508, 608, 708 ... Housing, 81, 281, 381, 481, 581, 681, 781 ... No. 1 wall portion, 85, 285, 385, 485, 585, 685, 785 ... second wall portion, 286, 287 ... thin wall portion, 384 ... thick wall portion, 686, 687 ... low rigidity material portion, 784 ... high rigidity material 9, drive device, 91, linear motor, 10, operation switch.

Claims (11)

A blade block having an inner blade portion in which a plurality of blade pieces are arranged in a predetermined direction, an outer blade portion provided so as to cover the plurality of blade pieces from the outside thereof, and the outer blade portion In an electric razor comprising a driving unit that reciprocates the inner blade part in the predetermined direction,
A housing that covers a side surface of the blade block and is located on the outermost side of the electric razor;
When the wall portion extending along the predetermined direction in the housing is a first wall portion and the wall portion extending in a direction orthogonal to the predetermined direction is a second wall portion,
The electric shaver is characterized in that the housing has a rigidity difference structure in which the rigidity of the second wall portion is lower than the rigidity of the first wall portion. The electric razor according to claim 1,
The electric shaver characterized in that the rigidity difference structure is configured such that the thickness of the second wall portion is smaller than the thickness of the first wall portion. The electric shaver according to claim 2,
The electric razor according to claim 1, wherein a thickness of the second wall portion is made smaller than a thickness of the first wall portion as a whole. The electric shaver according to claim 2,
An electric shaver characterized in that a part of the second wall part is formed with a thin part thinner than other parts of the second wall part. The electric shaver according to claim 4,
A plurality of the blade blocks are juxtaposed along a direction orthogonal to the predetermined direction,
The plurality of blade blocks include a mesh-like blade block having a mesh-like outer blade portion made of a mesh-like outer blade, and a slit-like blade block having a slit-like outer blade portion made of a slit-like outer blade,
The thin-walled portion is formed at a position corresponding to the mesh-shaped outer blade portion in a direction orthogonal to the predetermined direction. The electric shaver according to claim 2,
An electric razor characterized in that a thick part thicker than other parts of the first wall part is formed in a part of the first wall part. In the electric shaver according to any one of claims 1 to 5,
The electric shaver characterized in that the rigidity difference structure is such that the material constituting the second wall portion has a lower rigidity than the material constituting the first wall portion. The electric shaver according to claim 7,
The electric razor characterized by that the material which comprises the said 2nd wall part is a thing of lower rigidity than the material which comprises the said 1st wall part as a whole. The electric shaver according to claim 7,
An electric shaver characterized in that a part of the second wall part is formed with a low-rigidity material part made of a material having a lower rigidity than other parts of the second wall part. The electric shaver according to claim 9,
A plurality of the blade blocks are juxtaposed along a direction orthogonal to the predetermined direction,
The plurality of blade blocks include a mesh-like blade block having a mesh-like outer blade portion made of a mesh-like outer blade, and a slit-like blade block having a slit-like outer blade portion made of a slit-like outer blade,
The electric razor according to claim 1, wherein the low-rigidity material portion is formed at a position corresponding to the mesh-shaped outer blade portion in a direction orthogonal to the predetermined direction. The electric shaver according to claim 7,
An electric shaver characterized in that a part of the first wall part is formed with a high-rigidity material part made of a material having higher rigidity than other parts of the first wall part.

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