JP4294813B2 - Microphone support device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a support device for supporting a microphone used in the field of audiovisual equipment.
[0002]
[Prior art]
In recent years, technological advances such as downsizing, weight reduction, and high sensitivity of microphones have been remarkable in the field of audiovisual equipment. Along with this, there is a strong demand for anti-vibration measures for microphones. This is because, for example, when recording and recording with a video camera equipped with a microphone, the vibration noise generated by the rotating operation of the drive motor, gear, etc. of this video camera and the running vibration of the magnetic tape are transmitted to the microphone through the support device that supports the microphone. Because it will be recorded as.
[0003]
As shown in FIGS. 8 to 10, the conventional microphone anti-vibration structure includes a microphone 1 sandwiched by a cylindrical support device 2 that is fixed to a video camera body 4 and can be opened and closed vertically. A vibration-proofing member 3 such as a butyl-based vibration-proof rubber is provided at a portion where the microphone 1 is sandwiched.
[0004]
Thus, by inserting the vibration isolating member 3 between the microphone 1 and the support device 2, vibration noise generated during recording with a video camera or the like has been reduced.
[0005]
However, with the higher sensitivity of modern microphones, it is no longer possible to obtain a sufficient microphone damping effect that satisfies the specifications, and as an improvement measure, the initial thickness of the anti-vibration member is reduced so that the microphone can be clamped. The vibration damping effect is enhanced by holding the microphone with a weak force, such as reducing the compressive force of the vibration isolating member generated in the above, or using a material such as gel silicone having a very low hardness.
[0006]
[Problems to be solved by the invention]
However, when the microphone is held with a weak force by configuring the initial thickness of the vibration isolating member to be thin, the holding force for preventing the microphone from being pulled out, which is controlled by the friction between the microphone and the vibration isolating member, is reduced. The drop occurred, and in a severe case, there was a problem that the microphone dropped during shooting.
[0007]
In addition, when using a vibration isolating material made of, for example, gel-like silicone rubber having a very low hardness as the material of the vibration isolating member, a microphone is used more than when the initial thickness of the vibration isolating member is made thin. Since the compression force of the vibration isolating member at the time of clamping can be increased, the holding force of the microphone is stabilized. However, as shown in FIG. 11, when a large pulling force action F acts in the axial direction of the microphone, There is a problem in that the compression force Fy of the vibration isolating member is suddenly reduced with the fall, and the holding force of the microphone is thereby reduced. As described above, there is a limit in improving the vibration damping effect by adjusting the initial thickness and hardness of the vibration isolating member in the conventional configuration.
[0008]
In view of the above-described problems, the present invention provides a vibration-relieving member that has a very low hardness for the purpose of improving the damping effect. An object of the present invention is to provide a microphone support device that can prevent a reduction in microphone clamping force and maintain stable clamping.
[0009]
[Means for Solving the Problems]
Since the present invention is to solve the above problems, with one of the clamping portion and the other clamping portion Noso inner surface vibration isolating members respectively semicylindrical semi-cylindrical shape, and the one clamping portion and the other in the microphone supporting device for clamping the microphone to the tubular clamping portion formed by sandwiching section, in both opening edges in the axial direction of each of the cylindrical shape clamping portion of the one clamping portion and the other holding portion, wherein A fall prevention member for preventing a deformation in the axial direction of the vibration isolation member is provided by providing a gap with an end surface of the vibration isolation member .
[0010]
According to the present invention, in a sandwiched state of the microphone on the support device, can be configured to open the gap to the extent that the prevention member fall and viewed vibration isolating member when the omission force acting on the microphone acts contacts, microphone The compression deformation of the vibration isolating member at the time of pinching can be freely made without being constrained at its end face, and it is possible to prevent the vibration damping effect from being lowered, and when the pulling force action acts on the microphone, The anti-vibration member is deformed and tries to fall with the movement of the microphone, but the anti-vibration member prevents the anti-vibration member from collapsing and prevents the vibration-proof member from holding down against the microphone. Therefore, it is possible to prevent the microphone from coming off while maintaining a high vibration damping effect.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.
[0012]
FIG. 3 shows a state where the support device of the present embodiment is opened and the microphone is removed, and the configuration of the support device will be described based on FIG.
[0013]
The support device 2 is fixed to the video camera body 4 and is composed of an upper clamping unit 8 and a lower clamping unit 9 which are parts that clamp the microphone 1, and a screw 5 for maintaining the clamping state of the microphone 1.
[0014]
The structure of the upper clamping part 8 includes a semi-cylindrical upper cylindrical part 2a, an L-shaped engaging part 12 formed integrally with one end of the upper cylindrical part 2a, and a microphone 1 sandwiched between the other ends of the upper cylindrical part 2a. It is comprised from the hinge part 10 formed so that it might become parallel to an axial center direction. The hinge portion 10 pivotally supports the upper clamping portion 8 and the lower clamping portion 9 and is supported so as to be rotatable about the hinge portion 10. On the inner peripheral surface of the upper cylindrical portion 2a, a vibration isolating member 3 made of an elastically deformable gel-like silicone rubber is bonded, and a contact surface 3a located on the upper surface of the vibration isolating member 3 is a microphone 1. To touch. Further, flanges projecting in the centripetal direction are erected at both semicircular opening edges of the upper cylindrical portion 2a, and this is used as a fall prevention member 14. Details of the vibration isolating member 3 and the collapse preventing member 14 will be described later. The L-shaped engaging portion 12 has a through hole 13a at the center of the lower surface thereof, and has a thin plate-like surface 12a on the upper cylindrical portion 2a side.
[0015]
The structure of the lower clamping part 9 includes a semi-cylindrical lower cylindrical part 2b, an engagement base part 11 formed integrally with one end edge of the lower cylindrical part 2b, and the other end of the lower cylindrical part 2b. The hinge part 10 is comprised. The hinge portion 10 is rotatably supported by the upper cylindrical portion 2a. On the inner peripheral surface of the lower cylindrical portion 2b and the semicircular opening edges, the same components as those of the vibration isolating member 3 and the fall preventing member 14 provided in the upper cylindrical portion 2a are provided. The engaging base 11 is fixed to the video camera body 4 and has a screw hole 13 at the center of the upper surface of the engaging base 11 and a thin plate shape of the upper cylindrical part 2a on the lower cylindrical part 2b side. It has a notch surface 11a that is notched so as to correspond to the surface 12a.
[0016]
The microphone 1 is clamped by the support device 2 having such a configuration. First, the microphone 1 is placed on the contact surface 3a of the lower cylindrical portion 2b, and the upper cylindrical portion 2a is rotated about the hinge portion 10 as an axis. Then, the microphone 1 is sandwiched in the support device 2 so that the support device 2 is closed. At this time, the thin plate-like surface 12a of the upper sandwiching portion 8 and the notch surface 11a of the lower sandwiching portion 9 are engaged, and the screw hole 13 and the through hole 13a are matched. Next, the microphone 1 can be held in a state where the screw 5 is screwed into the screw hole 13 via the through hole 13a.
[0017]
Next, FIGS. 1A and 1B showing the state in which the supporting device 2 is closed without holding the microphone 1 and FIGS. 2A, 2B and 2C showing the state in which the microphone 1 is held. Based on the above, the configuration of the vibration isolating member 3 and the fall preventing member 14 will be described in detail.
[0018]
The thickness of the vibration isolating member 3 sandwiching the microphone 1 provided on the inner peripheral surfaces of the upper cylindrical portion 2a and the lower cylindrical portion 2b is such that the distance between the contact surfaces 3a of the anti-vibration member 3 facing each other is the diameter of the microphone 1. Thickness is given so that it may become shorter and may become higher than the height H of the fall prevention member 14 shown to Fig.1 (a). Further, the vibration isolating member 3 is provided so as to open a gap G on the inner side of the both sides falling prevention member 14 with respect to the axial direction of the microphone 1.
[0019]
The height H of the fall-preventing member 14 is determined when the microphone 1 shown in FIG. 2A is sandwiched from the thickness of the vibration isolating member 3 provided on the inner peripheral surfaces of the upper cylindrical portion 2a and the lower cylindrical portion 2b. The deformation amount Y that is deformed in the circumferential direction from the axial center of the microphone 1 due to elastic deformation is set lower than the thickness and height of the vibration-proof member 3 that is subtracted. As a result, when the microphone 1 is held by the support device 2, the contact portion of the microphone 1 is held only by the contact surface 3 a without contacting the fall prevention member 14.
[0020]
The gap G is set slightly wider than the deformation amount X that deforms in the axial direction of the microphone 1 due to elastic deformation shown in FIG. 2 when the microphone 1 is held (G ≧ X). As a result, when the microphone 1 is held by the support device 2, the vibration isolating member 3 is configured to have a slight gap so that it does not barely contact the fall preventing member 14.
[0021]
Moreover, as a material of the fall prevention member 14, it is a highly rigid board material, such as a metal plate, and it is desirable that the shape is continuous in the circumferential direction according to the shape of the vibration isolation member 3 shown in FIG. However, as shown in FIG. 2 (c), the same effect can be obtained even if it is divided into several parts in the circumferential direction along the shape of the vibration isolating member 3. Further, the fall prevention member 14 can be provided integrally at both opening edges of the upper cylindrical portion 2a and the lower cylindrical portion 2b.
[0022]
Next, in the support device of this embodiment, the clamping state when the pulling force action F is generated in the microphone will be described based on FIG.
[0023]
When the microphone 1 generates a pulling force action F from the support device 2 in the axial direction of the microphone 1, as shown in FIG. 4, the vibration isolation member 3 has a contact surface 3 a that contacts the microphone 1 and the pulling force action F acts. Then, it is elastically deformed so as to come into contact with and come into pressure contact with the fall prevention member 14. At this time, the vibration isolating member 3 increases the compressive force Fy to the microphone 1, thereby preventing the vibration isolating member 3 from falling and preventing a decrease in the clamping force of the supporting device 2 against the microphone 1, and in some cases improving the clamping force. Plan.
[0024]
Next, the example verified by the numerical analysis by the finite element method based on FIGS. 5-7 is shown.
[0025]
In this embodiment, the height H of the fall prevention member 14 is set to 2.5 mm, and the dimensions of the vibration isolation member 3 are set to an initial thickness of 5 mm, an initial width of 20 mm, and a depth of 20 mm. A value typified by gel-like silicone comprising .0003 kgf / mm ² and Poisson's ratio of 0.49 was adopted. In such a set value, the amount of change X of the vibration isolating member 3 when sandwiched between the microphones 1 is taken into consideration by about 0.2 mm, and the gap G to the fall prevention member 14 is set at a position separated by about 0.5 mm. Then, a pull-out force action F is generated in the microphone 1 sandwiched between the support devices 2, and the finite element method analyzes the compressive force Fy on the microphone 1 due to elastic deformation of the vibration isolating member 3 up to 1 mm in the axial direction of the microphone 1. went. Further, as a comparison object, the same analysis was performed by setting the vibration isolating member 3 in the same manner as described above without installing the conventional fall preventing member 14. As shown in FIG. 7, these analysis results indicate that both are 25 gf in the state where the microphone 1 does not generate the pulling force action F, whereas the microphone 1 generates the pulling force action F. In the state of being moved by 1 mm in the direction, the compression force Fy is reduced to 24 gf in the case of the conventional example, whereas it is increased to 32 gf in the case of the present embodiment.
[0026]
【The invention's effect】
According to the present invention, in order to improve the damping effect, even when the material of the vibration isolating member is, for example, a gel-like silicone rubber having a very low hardness, when the pulling-out action is applied to the microphone, A decrease in the microphone clamping force can be prevented and stable clamping can be maintained.
[Brief description of the drawings]
FIG. 1 shows a microphone support device according to an embodiment of the present invention in a state in which the support device is closed without holding the microphone, (a) is a diagram showing a cross-sectional view thereof, and (b) is a side view thereof. FIG.
2A and 2B show a state in which the microphone is clamped in the microphone support device of the embodiment of the present invention, FIG. 2A is a cross-sectional view thereof, and FIG. 2B is a side view thereof; c) is a view showing a side view in which the shape of the fall-preventing member provided in the supporting device is applied.
FIG. 3 is a perspective view of the microphone support device according to the embodiment of the present invention in a state in which the support device is opened without holding the microphone.
FIG. 4 is a diagram showing a cross-sectional view of the microphone support device according to the embodiment of the present invention in a clamped state when a pulling force action is generated in the microphone.
FIG. 5 is a diagram showing a cross-sectional view obtained by numerical analysis of a finite element method in a holding state when a pulling-out force action is generated in the microphone in the microphone support device of the embodiment of the present invention.
FIG. 6 is a cross-sectional view obtained by numerical analysis of a finite element method with respect to a holding state when a pulling force action is generated in the microphone in the microphone support device of the conventional embodiment.
FIG. 7 is a graph comparing the results obtained by numerical analysis of the finite element method with respect to the holding state when the pulling force action occurs in the microphone in the microphone support device of the embodiment of the present invention and the conventional embodiment. FIG.
FIG. 8 is a perspective view showing a state in which a microphone is clamped in a microphone support device of a conventional embodiment.
FIG. 9 is a perspective view of a microphone support device according to a conventional embodiment in a state where the support device is opened without holding the microphone.
10A and 10B show a state in which a microphone is clamped in a microphone support device according to a conventional embodiment, wherein FIG. 10A is a cross-sectional view thereof, and FIG. 10B is a side view thereof.
FIG. 11 is a cross-sectional view of a microphone support device according to a conventional embodiment in a clamping state when a pulling force action is generated in the microphone.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Microphone 2 Support apparatus 3 Anti-vibration member 8 Upper clamping part 9 Lower clamping part 14 Fall prevention member

Claims (5)

The other clamping portion Noso inner surface of respectively the one holding portion and a semi-cylindrical shape of semi-cylindrical with an anti-vibration member, the one holding portion and the tubular clamping portion formed by the other clamping portion gap between the microphone support device for clamping a microphone, in the axial direction of both opening edges of each of said tubular shaped clamping portion of the clamping portion of the other and the one clamping portion, an end surface of said vibration isolating member A microphone supporting device , wherein a tipping prevention member is provided to prevent axial deformation of the vibration isolation member . The size of the gap between the fall prevention member and the end face of the vibration isolation member is such that the end face of the vibration isolation member deformed by the pulling force acting in the axial direction of the microphone and the fall prevention member are in contact with each other. The microphone support device according to claim 1. The microphone support device according to claim 1 or 2 , wherein a gel-like vibration-proof rubber is used as the vibration-proof member. 4. The microphone support device according to claim 3 , wherein silicone rubber is used as a material for the gel-like vibration-proof rubber.   A cylindrical shape provided with a microphone and provided with a vibration isolating member on each inner surface of one of the semi-cylindrical holding portions and the other holding portion of the semi-cylindrical shape, and formed by the one holding portion and the other holding portion In the microphone device provided with the microphone support means for holding the microphone in the holding portion, the vibration isolating member is provided at both opening edges in the axial direction of the cylindrical holding portion of each of the one holding portion and the other holding portion. A microphone device comprising a tipping prevention member that opens a gap between the end face of the anti-vibration member and prevents axial deformation of the vibration isolating member.

Images