JP2010257711A - Mounting structure of rotary knob - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure of rotary knob, configured so that the rotary knob can be rotated without looseness or wobbing while minimizing rubbing noise. <P>SOLUTION: In the mounting structure of a rotary knob rotating around a rotating shaft 12, an annular protruding portion 10g is provided on a side facing a panel 11 of the rotary knob 10, an annular spacer 14 including an elastic member 19 and a slidable member 20 is inserted between the panel 11 and the annular protruding portion 10g, and a fitting portion 10g of the rotary knob 10 is fitted to the rotating shaft 12 while bringing the annular spacer 14 into contact with the annular protruding portion 10g, whereby the rotary knob 10 is rotatably mounted on the panel 11. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotary knob mounting structure and, for example, to a rotary knob mounting structure suitable for being provided on a front panel or the like of an electronic device such as an audio apparatus or a video apparatus.

  Conventionally, there has been one disclosed in Patent Document 1 as a rotary knob mounting structure. In Patent Document 1, the rotary knob mounting structure includes a knob body (rotary knob) that is a rotation operation unit, a shaft that is integrally connected to the knob body, and a rotating shaft, and an interposed elastic member made of an elastic material. And a case body.

  The intervening elastic member is disposed between the knob body and the case body, and has an overlap portion that comes into contact with the inner periphery of the portion protruding in the cylindrical shape of the case body in a direction substantially perpendicular to the central axis of the shaft. It has come to produce. The knob body is appropriately set to adjust the rotational torque by this friction, and can stably rotate with respect to the case body.

  However, in this case, the interposed elastic member and the inner periphery of the portion protruding in the cylindrical shape of the case body are in contact with no gap, but the interposed elastic member and the bottom surface of the portion protruding in the cylindrical shape of the case body are in contact with each other. It has no gap. Therefore, there is a problem that rattling in the gap direction may occur. In addition, since friction is generated in the overlap portion, there is a problem that a rubbing sound or the like may occur when the knob body is rotated.

  Therefore, it is conceivable to screw the rotary knob to the shaft so that the above-described rattling does not occur (see, for example, Patent Document 2). Further, it is conceivable to apply grease to a portion where the rotary knob and the case body are rubbed so that the above-mentioned rubbing noise or the like does not occur (see, for example, Patent Document 3).

JP 2004-349580 A JP 2003-203542 A JP 11-345706 A

  However, when the rotary knob is screwed to the shaft so that the rotary knob does not rattle, a process of providing a screw hole in the rotary knob is required, and a screw and a metal shaft are required. There is a problem in terms. Further, when the rotary knob is screwed to the shaft, an inexpensive material such as plastic cannot be used due to the problem of processing accuracy, and it is necessary to use an expensive material such as aluminum. Also, in audio equipment, it is necessary to suppress noise, and it is necessary to prevent rubbing sound from the rotary knob. When grease is applied to a portion where the rotary knob and the case body are rubbed so that a rubbing sound or the like is not generated, there is a problem in terms of cost because the grease is required.

  The present invention has been made in view of the above-described circumstances, and is intended to solve the above-described problems as an example, and provides a rotary knob mounting structure that can solve these problems. The purpose is to do.

The rotary knob mounting structure according to the present invention is configured as follows in order to achieve the above object.
The rotary knob mounting structure according to the first aspect of the present invention is a rotary knob mounting structure for rotating a rotary shaft, wherein an annular protrusion is provided on a side of the rotary knob facing the panel, and the rotary knob is provided between the panel and the annular protrusion. With the annular spacer provided with an elastic member and a slidable member sandwiched, the rotating knob is fitted to the rotating shaft and the rotating knob can be rotated to the panel while the annular spacer and the annular protrusion are in contact with each other. It is attached.

It is a disassembled perspective view from the front side which shows the rotary knob attachment structure which concerns on this embodiment of this invention. It is a disassembled perspective view from the back side which shows the rotary knob attachment structure which concerns on this embodiment of this invention. It is sectional drawing which shows the rotary knob attachment structure which concerns on this embodiment of this invention. It is the (a) front view of a spacer, and the enlarged view of (b) BB cross section. It is an enlarged view of the part A of FIG. It is a figure explaining the effect | action in the rotary knob attachment structure which concerns on this embodiment of this invention.

  Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 to 5 show a rotary knob mounting structure according to this embodiment of the present invention, FIG. 1 is an exploded perspective view from the front side of the rotary knob mounting structure, and FIG. 3 is an exploded perspective view, FIG. 3 is a sectional view thereof, FIG. 4 is a view showing a spacer, and FIG. 5 is an enlarged view of a portion A in FIG.

  1 to 3, reference numeral 10 denotes a rotary knob that is disposed so as to be exposed from the front panel 11 of the audiovisual apparatus and rotates the rotary shaft 12. The rotary knob 10 includes an outer member 10b and an inner member 10h. The outer member 10b includes a collar portion 10a at an open end portion of a cylinder made of a metal such as aluminum. The inner member 10h includes a cylindrical fitting portion 10d at the center position of a cylinder 10c made of a resin such as ABS resin. The inside of the fitting portion 10d is half filled with resin with a plane including a cylindrical axis as a boundary. Further, the inner member 10h includes a wall portion 10e that stably fixes the fitting portion 10d and a flange portion 10f provided at an open end portion of the cylinder 10c. Further, the inner member 10h is provided with an annular rib (annular protrusion) 10g on the side facing the panel 11. By using resin for the inner member 10h and using aluminum or the like for the outer member 10b, the rotary knob 10 that is inexpensive and has a high-class feeling can be formed.

  The rotary knob 10 has a semi-cylindrical shape of an electronic component 16 such as a rotary encoder fixed to a printed circuit board 15 with an annular spacer 14 sandwiched between the panel 11 and the rib 10g and the spacer 14 and the rib 10g being in contact with each other. The rotary shaft 12 is fitted by a fitting portion 10d and is rotatably attached to the panel 11. Further, a protrusion 18 for fixing the spacer 14 is provided on the panel 11 side. The diameter of the annular rib 10 g is smaller than the diameter of the outer periphery of the annular spacer 14 and larger than the diameter of the inner periphery of the annular spacer 14. Thereby, the annular rib 10g can be disposed in contact with the annular spacer 14. The rotary knob 10 has a structure in which the inner member 10h is formed of ABS resin and the outer member 10b is formed of aluminum or the like, but may be integrally formed of resin. At this time, the rotary knob can be manufactured at a lower cost.

  FIG. 4 is a front view (a) of the spacer 14 and an enlarged view (b) of the BB cross section. As shown in FIG. 4, the spacer 14 has a structure in which an elastic member 19 and a slidable member 20 are bonded by a double-sided tape 21, and a surface of the elastic member 19 opposite to the slidable member 20 is a double-sided tape. 22 is adhered to the panel 11. The elastic member 19 is made of, for example, high-density microcell urethane foam having a hardness of about 25 ° to 48 ° and a thickness of about 0.8 mm. The slidable member 20 is made of, for example, a polytetrafluoroethylene or the like. It is made of carbonized carbon resin and has a thickness of about 0.18 mm. The double-sided tapes 21 and 22 are, for example, those having a thickness of about 0.15 mm, and the total thickness of the spacer is, for example, about 1.28 mm. The slidable member 20 makes it easy for the rib 10g to slide, and a rubbing sound can be suppressed.

  FIG. 5 is an enlarged view of a portion indicated by reference symbol A shown in FIG. 3, and is an enlarged view of a contact portion of the rib 10g with the spacer 14. FIG. At the tip of the rib 10g, there is provided a protrusion 23 that protrudes in the direction toward the spacer 14 along the annular rib 10g. Thereby, since the contact of the rib 10g with the spacer 14 is only at the tip of the projection 23, the contact area between the rib 10g and the spacer 14 can be reduced. In FIG. 5, the cross-sectional shape of the protrusion 23 is shown as a semicircular shape, but the cross-sectional shape of the protrusion 23 may be V-shaped. Further, in FIG. 5, since the spacer 14 includes the elastic member 19, it is shown that a recess 24 is generated in the spacer 14 via the slidable member 20 due to the protrusion 23. The protrusions 23 and the recesses 24 formed in the spacer 14 increase the stability of the rotary knob during rotation. Furthermore, the rubbing sound can be further suppressed by making the surface of the protrusion 23 close to a mirror surface. Moreover, the same effect is recognized even if quick-drying grease is applied to the surface of the protrusion 23.

  In the above configuration, when the rotary knob 10 is attached with the electronic component 16 and the front panel 11 fixed to the printed circuit board 15, the spacer 14 is attached to the panel 11 and the rotary knob fitting portion 10d is rotated. The shaft 12 is fitted.

  In the rotary knob mounting structure according to the above-described embodiment, the spacer 14 is provided between the rib 10 g of the rotary knob 10 and the panel 11, and the protrusion 23 is the surface of the spacer 14 including the elastic member 19 and the slidable member 20. Since the recess 24 is made and the gap between the rib 10 g and the panel 11 is filled with the spacer 14, rattling and surface blurring are eliminated. Further, the rotational force of the rotary knob 10 is transmitted to the rotary shaft 12 to rotate the rotary shaft 12. At this time, since the slidable member 20 is provided at the contact portion of the spacer 14 with the rib 10g, the rib 10g The friction noise can be suppressed.

  Next, the operation of the rotary knob mounting structure according to this embodiment of the present invention will be described.

  FIG. 6 is a diagram illustrating a state when the rotary knob 10 according to the present embodiment is rotated. FIG. 6A is a view of the rotary knob 10 as viewed from the front. When the rotary knob 10 is rotated using a hand, the finger F is applied to the portion indicated by reference numeral 30 and the portion indicated by reference numeral 31 of the rotary knob 10, and the force F3 indicated by the arrow 32 is obtained by twisting the hand. Then, the force F4 indicated by the arrow 33 works. Thereby, a moment of force acts on the rotary knob 10, the rotary knob 10 rotates, the rotational force is transmitted to the rotary shaft 12, and the rotary shaft 12 rotates.

  At this time, if the force F3 acting on the portion indicated by reference numeral 30 and the force F4 acting on the portion indicated by reference numeral 31 are the same magnitude, the rotary knob 10 receives only the rotating action, but in the twisted state of the hand, There is a case where the force F3 acting on the portion indicated by reference numeral 30 and the force F4 acting on the portion indicated by reference numeral 31 are not the same. At that time, as shown in FIG. 6B, in addition to the moment of the rotating force, a force (F4-F3: arrow 34) for tilting the rotating knob 10 with respect to the rotating shaft 12 acts on the rotating knob 10. It will be. In this embodiment, since the rib 10g is in contact with the spacer 14 at that time, the rib 10g receives the force F5 indicated by the arrow 35 from the spacer 14 (FIG. 6C) and tries to tilt the rotary knob 10. The rotation knob 10 does not tilt and balances with the moment due to the force (F4-F3), thereby eliminating rattling and surface blurring. Further, when the rotary knob 10 rotates, since the slidable member 20 is on the contact surface of the spacer 14 with the rib 10g, a rubbing sound can be suppressed.

  As described above, in this embodiment, the spacer 14 is provided between the rib 10g and the panel 11 when the rotary knob 10 is rotated. Can be prevented. Further, since the spacer 14 includes the slidable member 20, it is possible to suppress a rubbing sound with the rib 10g. Furthermore, since it is possible to prevent the rotary knob 10 from rattling or surface blurring, vibration due to the sound pressure of the sound radiated from the speaker device is suppressed, and the influence on the electronic components in the housing is reduced. Can do. Thereby, the sensibility quality as an electronic device such as an audio apparatus can be improved by improving the sound quality.

In this embodiment, the spacer 14 provided with the elastic member 19 and the slidable member 20 is used. However, only the elastic member having a smooth surface may be used for the spacer 14.
Further, an elastic member may be used for the spacer 14 and a slidable member may be provided at the tip of the rib 10g.

  The configurations, shapes, sizes, and arrangement relationships described in the above embodiments are merely schematically shown to the extent that the present invention can be understood and implemented, and the numerical values and the compositions (materials) of the respective components Is just an example. Therefore, the present invention is not limited to the described embodiments, and can be variously modified without departing from the scope of the technical idea shown in the claims.

10 Rotation knob 10d Fitting part 10g Rib (annular protrusion)
DESCRIPTION OF SYMBOLS 11 Panel 12 Rotating shaft 14 Spacer 15 Printed circuit board 16 Electronic component 18 Protrusion part 19 Elastic member 20 Sliding member 21 Double-sided tape 22 Double-sided tape 23 Protrusion part

Claims (3)

A rotary knob mounting structure for rotating a rotary shaft,
An annular protrusion is provided on the side facing the panel of the rotary knob,
An annular spacer provided with an elastic member and a slidable member is sandwiched between the panel and the annular protrusion,
The rotary knob, wherein the rotary knob is rotatably attached to the panel by fitting the rotary knob with the rotary shaft while the annular spacer and the annular protrusion are in contact with each other. Mounting structure.   2. The rotary knob mounting structure according to claim 1, wherein the slidable member is a sheet made of polytetrafluoroethylene. 3. The rotary knob mounting structure according to claim 1, wherein a projecting portion projecting in a direction toward the annular spacer is provided at an end portion of the annular projecting portion facing the annular spacer.

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