JP7130398B2 - microphone unit and electronic equipment - Google Patents

Description

The present invention relates to a microphone unit provided in an electronic device including an imaging device such as a digital camera or a digital video camera, and an electronic device provided with the microphone unit.

2. Description of the Related Art An electronic device including an imaging device such as a digital video camera generally incorporates a microphone for collecting and recording audio and the like together with video. A microphone places a voice coil integrally attached to a diaphragm in a magnetic circuit to generate an audio signal from an electrical signal generated by the vibration of the diaphragm.

Inside the image pickup apparatus, vibration generated when a mechanical unit such as a zoom unit of an optical lens system is driven during shooting may propagate through an exterior member, reach a microphone, and shake a diaphragm. Then, there is a problem that this vibration is detected as an audio signal and recorded as vibration noise.

Therefore, a technique for reducing this type of vibration noise has been proposed (Patent Document 1). In this proposal, an annular outer peripheral body and an annular inner peripheral body of a rubber part formed in a flat shape are integrally formed with a plurality of connecting portions, and the connecting portions are provided with a plurality of through holes to form a rubber part. Make the damping characteristics of the parts close to the resonance frequency of the microphone element. By applying this technology to the imaging device, it is possible to reduce the vibration that propagates through the exterior and is transmitted to the microphone.

JP 2014-57137 A

However, in Patent Document 1, since the damping characteristic of the rubber component is adjusted by the shape of the through hole, it is difficult to greatly change the damping characteristic of the rubber. Moreover, since the damping characteristics of the rubber are adjusted by the shape of the through hole, there is a problem that the size of the through hole becomes large.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a microphone unit capable of effectively reducing vibrations that propagate through an exterior and reach a sound collecting portion, and an electronic device including the microphone unit.

In order to achieve the above object, the microphone unit of the present invention includes a sound collecting portion, a first holding member formed of an elastic member for elastically holding the sound collecting portion, and an elastically and a microphone holder that elastically holds the second holding member, wherein the first holding member and the second holding member have different hardnesses It is characterized in that the microphone holder is made of a material, and attached with the second holding member compressed and sandwiched therebetween .

ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to reduce effectively the vibration which propagates an exterior and reaches a sound collection part.

1 is a perspective view of a digital video camera provided with a microphone unit that is an example of an embodiment of the present invention, viewed from the front right side; FIG. 2 is a perspective view of the digital video camera shown in FIG. 1 as seen from the front left side; FIG. 3 is an exploded perspective view of a microphone section; FIG. 2 is an exploded perspective view of a microphone unit; FIG. It is a perspective view of inner side microphone rubber. It is the perspective view seen from the front side of the outer side microphone rubber. It is the perspective view which looked at the outer side microphone rubber|gum from the back side. It is a perspective view of a microphone holder. FIG. 4 is a perspective view showing a state in which an inner microphone rubber is incorporated into an outer microphone rubber; FIG. 4 is a cross-sectional view of a state in which the inner microphone rubber is incorporated into the outer microphone rubber; It is a figure explaining attachment to a microphone holder of outside microphone rubber. 4 is a cross-sectional view of the microphone unit; FIG. FIG. 4 is a cross-sectional view of a microphone portion in a locking piece;

An example of an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a digital video camera provided with a microphone unit that is an example of an embodiment of the present invention, viewed from the front right side. FIG. 2 is a perspective view of the digital video camera shown in FIG. 1 as seen from the front left side. In this embodiment, as shown in FIG. 1, the subject side of the digital video camera is defined as the front side, and the digital video camera is defined as the left side and the right side when viewed from the rear side. Further, in this embodiment, a digital video camera, which is an example of an imaging device, is exemplified as an electronic device of the present invention, but the present invention is not limited to this.

As shown in FIGS. 1 and 2, the digital video camera 100 (hereinafter referred to as the camera 100) of this embodiment has a lens unit 102 provided on the front side of the camera body 101, and a lens unit 102 on the right side of the camera body 101. A grip portion 103 is provided. A handle portion 104 is provided on the upper portion of the camera body 101 , and a microphone portion 105 is provided on the front end portion of the handle portion 104 .

The camera body 101 incorporates a control board (not shown) for controlling the camera 100 as a whole, a power supply unit, a recording unit, an imaging element, various operation units, and the like. The lens unit 102 is integrally arranged on the front side of the camera body 101, and has an optical element such as a photographing optical system composed of a plurality of lens groups (not shown), a diaphragm, etc., and an actuator for driving these optical elements. The subject light flux that has passed through the imaging optical system of the lens unit 102 forms an image on the imaging device and undergoes photoelectric conversion.

Also, the lens group includes a zoom lens that changes the angle of view of a captured image and a focus lens that focuses on a subject, and these lenses move in the optical axis direction by driving actuators. Further, by driving the actuator, the amount of light received by the diaphragm can be adjusted. Here, when the actuator is driven, vibration occurs, and the vibration propagates to the exterior member 100a of the camera 100. As shown in FIG.

The grip portion 103 is a portion for gripping the camera 100 with one hand at the height of the photographer's line of sight during photographing. Further, the grip unit 103 is provided with various operation systems such as parts for operating actuators of the lens unit 102 such as zoom and aperture, and trigger keys for instructing start/stop of recording. When using the camera 100 while holding it with one hand, it is more stable and easier to use if it is held with the dominant hand. In general, most people have a right-handed hand, so in this embodiment, the grip part 103 is provided on the right side surface of the camera body 101 .

The handle portion 104 is provided on the upper surface of the camera body 101 and has a handle front leg portion 1041 , a handle rear leg portion 1042 , a handle grip portion 1043 and a handle front portion 1044 . The handle front leg portion 1041 is a columnar portion that extends upward slightly forward of the center of the upper surface of the camera body 101 . The handle rear leg portion 1042 is a columnar portion extending upward from the rear end portion of the upper surface of the camera body 101 .

The handle grip portion 1043 connects the front handle leg portion 1041 and the rear handle leg portion 1042 substantially parallel to the optical axis of the lens portion 102 at a position spaced apart from the upper surface of the camera body 101 . It is a part to do. Since there is a space between the handle gripping portion 1043 and the upper surface of the camera body 101, the handle gripping portion 1043 can be gripped. This makes it easy to carry the camera 100 during low-angle photography, for example, and makes the camera 100 extremely user-friendly.

In addition, wavy unevenness is provided on the lower surface of the handle gripping portion 1043, and these unevennesses can easily engage fingers when gripping the handle gripping portion 1043, making the shape extremely easy to hold. ing. The handle front portion 1044 is a portion protruding forward from the handle front leg portion 1041 substantially parallel to the optical axis of the lens portion 102 .

The microphone section 105 is a unit for recording audio signals in the shooting environment, and is arranged in the handle front section 1044 . A configuration of the microphone unit 105 will be described later.

Next, the microphone section 105 will be described in detail with reference to FIG. FIG. 3 is an exploded perspective view of the microphone section 105. As shown in FIG.

As shown in FIG. 3, the microphone unit 106 is fixed to a microphone base cover 108 that constitutes a part of the appearance of the handle front part 1044 with a screw 109, and the microphone cover 107 is attached to the outside thereof. covered. A microphone board 110 for signal processing of an audio system is provided inside the handle front portion 1044 , and the microphone board 110 is electrically connected to the microphone unit 106 .

The microphone unit 106 is a unit in which the diaphragm vibrates upon receiving vibrations such as sound in the imaging environment and converts the vibrations into electrical signals, the details of which will be described later. A microphone cover 107 is an exterior cover that surrounds the microphone unit 106 . Since the portion of the microphone cover 107 covering the microphone unit 106 is made of a mesh-like metal member, it has a configuration in which external sounds can easily pass through to the inside. In addition, since the microphone cover 107 is made of a metal material, it is possible to sufficiently secure the strength of the microphone section 105 even in a mesh shape.

Next, details of the microphone unit 106 will be described with reference to FIG. FIG. 4 is an exploded perspective view of the microphone unit 106. FIG. As shown in FIG. 4, the microphone unit 106 is composed of a microphone element 111, an inner microphone rubber 112, a microphone sponge 113, an outer microphone rubber 114, a microphone holder 115, and a wire .

The microphone element 111 is provided with a sound collecting portion having a diaphragm on the front side and an electrical connection portion on the back side. Inside the microphone element 111, a circuit (not shown) is arranged for converting an audio signal input from the diaphragm into an electric signal.

The microphone sponge 113 is a porous resin member having a predetermined opening ratio and elasticity, suppresses wind noise caused by sudden wind pressure, and prevents the sound pressure from directly hitting the sound collecting portion of the microphone element 111. to prevent

Both the inner microphone rubber 112 and the outer microphone rubber 114 are made of elastic rubber-based elastic members. The inner microphone rubber (first holding member) 112 elastically holds the microphone element 111 , and the outer microphone rubber (second holding member) 114 elastically holds the inner microphone rubber 112 . The outer microphone rubber 114 uses a softer rubber material than the inner microphone rubber 112.例文帳に追加The detailed shapes of the inner microphone rubber 112 and the outer microphone rubber 114 will be described later.

The microphone holder 115 is a member formed of a thin plate-shaped metal material that serves as the base of the microphone unit 106 .

The wire 116 has one end soldered to the electrical connection on the back of the microphone element 111 and the other end electrically connected to the microphone substrate 110 . A sound signal obtained from the sound collecting unit is converted into an electric signal inside the microphone element 111 and then sent to the microphone substrate 110 through the wire 116 for predetermined processing.

5(a) is a perspective view of the inner microphone rubber 112 viewed from the front side, and FIG. 5(b) is a perspective view of FIG. 5(a) viewed from the rear side. Since a pair of inner microphone rubbers 112 are arranged symmetrically about the optical axis, only one side is shown in FIG.

As shown in FIG. 5(a), the inner microphone rubber 112 has an opening on the front side at a position avoiding the sound collecting portion of the microphone element 111. An element front recess 117 is formed. In addition, a thin flange portion 118 is provided around the back side of the inner microphone rubber 112 over the entire circumference.

As shown in FIG. 5(b), the back side of the inner microphone rubber 112 has openings at positions avoiding the electrical connections of the microphone element 111, and two openings are provided on each long side of the outer circumference. , a claw hooking portion 119 is formed by notching a part of the edge of the flange portion 118 .

FIG. 6 is a perspective view of the outer microphone rubber 114 viewed from the front side. FIG. 7 is a perspective view of the outer microphone rubber 114 viewed from the rear side. 6 and 7 show only one side of the outer microphone rubbers 114 because they are arranged symmetrically about the optical axis.

As shown in FIGS. 6 and 7, the outer microphone rubber 114 is provided with a concave portion 121 having a hole 120 communicating between the front and back sides on the back side. The edge of the concave portion 121 is provided with two claw portions 122 protruding inward on each long side of the outer periphery. A stepped portion 123 having a surface facing the claw portion 122 is formed at a position spaced apart from the claw portion 122 toward the concave portion 121 by a predetermined distance.

A continuous rib 124 is provided on the front side of the outer microphone rubber 114 in a ring shape so as to surround the hole 120 . In addition, on both side surfaces of the short sides of the outer microphone rubber 114, one protrusion 125 is provided so as to sandwich the hole 120 in the longitudinal direction. Two locking pieces 126 protruding in the lateral direction are provided on both side surfaces in the longitudinal direction perpendicular to the straight line connecting the two protrusions 125 . A pair of outer microphone rubbers 114 arranged bilaterally symmetrically about the optical axis are integrally connected by connecting portions 127 at the longitudinal side surfaces opposite to the locking pieces 126 .

8 is a perspective view of the microphone holder 115. FIG. As shown in FIG. 8, the microphone holder 115 is provided with a fixing area 128 for fixing the microphone unit 106 to the microphone base cover 108 with screws 109 (see FIG. 3). The fixed area 128 rises at an obtuse angle on one side and is connected to the widest flat base surface 129 .

Two through holes 130 are provided in the valley connecting the fixed area 128 and the base surface 129 . On both sides of the base surface 129, vertically bent portions 131 having openings are provided so as to face each other. In addition, since the microphone holder 115 has a line-symmetrical shape centering on the tip of the base surface 129 rising at an obtuse angle from the fixed area 128, it has a substantially triangular shape with a pointed tip.

Next, a method for holding the microphone element 111 in the microphone unit 106 will be described with reference to FIG. FIG. 9 is a perspective view showing a state in which the inner microphone rubber 112 is incorporated into the outer microphone rubber 114. FIG. As described above, the inner microphone rubber 112 and the outer microphone rubber 114 are arranged as a pair symmetrically about the optical axis, so only one side is shown in FIG.

First, the microphone element 111 is attached to the inner microphone rubber 112 with the sound collecting portion on the front side and the electrical connection portion on the back side. After that, as shown in FIG. 9, the inner microphone rubber 112 holding the microphone element 111 is inserted into the recess 121 of the outer microphone rubber 114 .

FIG. 10 is a cross-sectional view of a state in which the inner microphone rubber 112 is incorporated into the outer microphone rubber 114. As shown in FIG.

As shown in FIG. 10 , the size of the concave portion 121 of the outer microphone rubber 114 is set larger than the outer shape of the inner microphone rubber 112 in both length, width and depth. Therefore, the inner microphone rubber 112 can be smoothly inserted into the concave portion 121 of the outer microphone rubber 114 . At this time, the claw portion 122 provided on the outer microphone rubber 114 is engaged with the claw hooking portion 119 of the inner microphone rubber 112 to prevent the inner microphone rubber 112 from coming off.

The distance between the claw portion 122 of the outer microphone rubber 114 and the stepped portion 123 is set shorter than the thickness of the flange portion 118 at the claw hooking portion 119 of the inner microphone rubber 112 . Therefore, when the inner microphone rubber 112 is incorporated into the outer microphone rubber 114, the flange portion 118 is compressed in the thickness direction and a reaction force is generated.

Due to this reaction force, the inner microphone rubber 112 is held in the recess 121, and even when the camera 100 is vibrated, the inner microphone rubber 112 does not rattle and move, and sound can be collected well. In addition, the back surface of the inner microphone rubber 112 is set to be arranged at a position slightly recessed from the back surface of the outer microphone rubber 114 .

Further, the claw engaging portion 119 has a concave shape corresponding to the shape of the claw portions 122, but in the present embodiment, one of the plurality of claw portions 122 has a wider shape than the others. Therefore, the inner microphone rubber 112 cannot be assembled into the outer microphone rubber 114 except for a predetermined phase, and it cannot be assembled in the left-right reverse direction, thereby preventing erroneous assembly.

Next, with reference to FIG. 11, assembly of the outer microphone rubber 114 to the microphone holder 115 will be described.

When assembling the outer microphone rubber 114 to the microphone holder 115, the outer microphone rubber 114 is folded in two with the inner microphone rubber 112 assembled, as shown in FIG. Then, the locking piece 126 is passed through the through hole 130 of the microphone holder 115 and hooked on the rear side. At this time, a reaction force is generated in the outer microphone rubber 114 to return it to its original shape. .

In addition, the convex portion 125 of the outer microphone rubber 114 and the vertically bent portion 131 of the microphone holder 115 are arranged to face each other, and the convex portion 125 of the outer microphone rubber 114 is provided on the vertically bent portion 131 of the microphone holder 115 during assembly. It locks into the opened opening. It should be noted that the distance between the two vertical bending portions 131 is set to be slightly shorter than the width of the outer microphone rubber 114 . As a result, the outer microphone rubber 114 is sandwiched between the two vertically bent portions 131 in a compressed state, and its position in the lateral direction can be restricted.

Then, the convex portion 125 of the outer microphone rubber 114 is inserted into the opening of the vertically bent portion 131 of the microphone holder 115 . The outer dimensions of the convex portion 125 are set to be slightly larger than the width of the opening of the vertically bent portion 131 . As a result, it is possible to restrict upward floating and the like.

In this way, it is possible to press and hold the outer microphone rubber 114 against the base surface 129 only by the reaction force of the rubber without screwing the outer microphone rubber 114 to the microphone holder 115, thereby achieving very elastic holding. Realized.

FIG. 12 is a cross-sectional view of the microphone unit 106. As shown in FIG. As shown in FIG. 12, when the microphone unit 106 is assembled, the inner microphone rubber 112 and the bottom surface of the recessed portion 121 of the outer microphone rubber 114 are not in contact with each other, and a space is provided. That is, the inner microphone rubber 112 and the outer microphone rubber 114 are in contact only at the flange portion 118, and a gap is provided at the other portions.

Also, since the inner microphone rubber 112 is provided with the front element recess 117 , a relatively large space is formed in the recess 121 of the outer microphone rubber 114 on the front side (front side) of the microphone element 111 . In this embodiment, the microphone sponge 113 is arranged in the element front concave portion 117 .

Since the microphone sponge 113 is set to have a size sufficiently large for the hole 120, it does not fall off and is placed in front of the microphone element 111 while being sandwiched between the inner microphone rubber 112 and the outer microphone rubber 114. . Therefore, in the microphone unit 106 of the present embodiment, even if strong wind pressure enters inside, it is attenuated by the microphone sponge 113, and the sound collecting portion of the microphone element 111 does not greatly shake. That is, the microphone sponge 113 functions as a windshield member that reduces wind noise.

As described above, in the microphone unit 106 , the back surface of the inner microphone rubber 112 is set so as to be positioned slightly recessed from the back surface of the outer microphone rubber 114 . That is, only the outer microphone rubber 114 is in contact with the base surface 129 of the microphone holder 115 , and the inner microphone rubber 112 is held only via the outer microphone rubber 114 . Therefore, the microphone element 111 is held very elastically, and the configuration is such that vibration is less likely to be transmitted to the microphone element 111 .

13 is a cross-sectional view of the microphone portion 105 at the locking piece 126 of the outer microphone rubber 114. FIG. As shown in FIG. 13 , inside the microphone section 105 , the microphone unit 106 is in contact with the inner surface of the microphone cover 107 only at the ribs 124 of the outer microphone rubber 114 . At this time, the ribs 124 are slightly compressed.

By adopting a configuration in which only the ribs 124 of the microphone cover 107 and the outer microphone rubber 114 are in contact with each other, the front side (front side) of the microphone element 111 can be sealed on the inner surface side of the microphone cover 107 . That is, it is possible to prevent the sound propagating inside the camera 100 from reaching the sound collecting portion of the microphone element 111, thereby suppressing audio noise.

In addition, since the contact area between the microphone cover 107 and the outer microphone rubber 114 can be reduced while sealing the space on the front side of the microphone element 111, the transmission of vibration transmitted through the exterior to the microphone element 111 can be suppressed. can be done. Therefore, it is possible to suppress vibration noise from being added to the recorded audio information.

Furthermore, in the microphone section 105, as shown in FIG. 13, the locking piece 126 of the outer microphone rubber 114 of the microphone unit 106 is compressed between a portion of the fixing area 128 of the microphone holder 115 and a portion of the microphone base cover 108. It is sandwiched and fixed.

This locking piece 126 exists in the middle of the path through which the vibration that has propagated through the exterior to the microphone section 105 propagates from the screw 109 to the microphone holder 115 and transmits the vibration to the microphone element 111 . By sandwiching the compressed rubber, the locking piece 126 exerts the effect of suppressing the shaking of the fixed area 128, and also suppresses the vibration reaching the microphone element 111 through the inside of the microphone unit 106 from the fixed area 128. - 特許庁This makes it possible to reduce vibration noise.

As described above, in this embodiment, the outer microphone rubber 114 of the microphone unit 106 uses a softer rubber material than the inner microphone rubber 112 . If the hardness of the rubber material differs, the damping characteristics of vibration will differ. Vibration can be effectively damped in multiple frequency bands.

Further, by forming the outer microphone rubber 114 from a rubber material softer than the inner microphone rubber 112, the compression of the rib 124 is facilitated, so that the adhesion between the microphone unit 106 and the microphone cover 107 is improved, and the noise suppression effect is high. becomes.

As described above, in this embodiment, it is possible to effectively reduce the vibration that propagates through the exterior and reaches the microphone element 111 .

The configuration of the present invention is not limited to those exemplified in the above embodiments, and the material, shape, size, form, number, location, etc. can be appropriately changed within the scope of the present invention. is.

100 Camera 101 Camera body 102 Lens part 104 Handle part 105 Microphone part 106 Microphone unit 111 Microphone element 112 Inside microphone rubber 114 Outside microphone rubber 115 Microphone holder

Claims (7)

a sound collector, a first holding member formed of an elastic member that elastically holds the sound collector, and a second holding member formed of an elastic member that elastically holds the first holding member; a microphone holder that elastically holds the second holding member,
The first holding member and the second holding member are formed of materials having different hardnesses ,
A microphone unit , wherein the microphone holder is mounted in a state in which the second holding member is compressed and sandwiched therebetween . 2. The microphone unit according to claim 1, wherein said second holding member has lower hardness than said first holding member. 3. The microphone unit according to claim 1, wherein a predetermined space is formed on the front side of said sound collector held by said first holding member. 4. The microphone unit according to claim 3, wherein an elastic windshield member is provided in said predetermined space. 5. The microphone unit according to claim 1, wherein the second holding member is locked to the microphone holder in at least three directions. 6. A pair of said microphone holders are arranged line-symmetrically and are connected to each other by a connecting portion, and the distance between said pair of said microphone holders increases as the distance from said connecting portion increases. or the microphone unit according to item 1. An electronic device comprising: the microphone unit according to any one of claims 1 to 6 ; and an exterior cover of the microphone unit, wherein the second holding member is in contact with the inner surface of the exterior cover. machine.

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