JP2007059064A - Rotary switch device and video audio apparatus using device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary switch device for highly accurately restraining looseness of a lug with a simple constitution in the rotary switch device of a video audio apparatus having the lug, a knob and a dial. <P>SOLUTION: This rotary switch device is a rotary switch device having a rotary switch having a case storing a switch part and a shaft rotating by projecting from the case, and a rotary lug rotatably operated by meshing with the shaft. The case of the rotary switch has a cylindrical projection part projecting in a cylindrical shape from the case and having its axis coincident with a rotary shaft of the shaft. The rotary lug has a shaft meshing part meshing with the shaft and a cylindrical recessed part fitted to the cylindrical projection part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotary switch device used for an operation part of an audiovisual apparatus, and in particular, a rotary switch including a rotary switch such as a selector switch and a rotary encoder, and a knob, a knob, a dial, and the like attached to a shaft of the rotary switch. Relates to the device.

  In audiovisual equipment, rotary switches such as selector switches and rotary encoders are provided, for example, on the operation part of the front panel, and the shaft of the rotary switch has knobs, knobs, dials, etc. for easy operation by the user. Attached to form a rotary switch device. The case of the rotary switch is provided with a cylindrical convex portion having a spiral groove for fixing to the front panel, and the rotary switch is fixed to the mounting hole of the front panel by a nut screwed into the spiral groove.

  Here, in the rotary switch device, it is desirable that the knob attached to the shaft of the rotary switch does not rattle or does not shake and rotates smoothly. However, the rotational accuracy of the knob is governed by the rotational accuracy of the shaft in the rotary switch, and in inexpensive selector switches, rotary encoders and the like, backlash below a certain value is allowed. As a result, there is a problem that the knob of the operation part is loose in the audiovisual apparatus provided with the rotary switch device.

  Conventionally, there is a type in which a fitting cylinder is newly provided on a dial attached to a shaft, and this is fitted into an insertion hole provided in a front panel to prevent the dial of the rotary operation dial device from falling down. (Patent Document 1).

Japanese Patent Laid-Open No. 10-294043 (FIG. 1)

  However, in the rotary switch device of an audiovisual apparatus, there may be a case where a fitting structure that restricts the rotational accuracy of the knob cannot be provided on the front panel. When the rotary switch cannot be mounted directly on the front panel, the rotary switch is fixed to the front panel via a fixing bracket or the like. There is a problem that it is not possible to achieve a high accuracy expected in an expensive audiovisual apparatus or the like.

  The present invention has been made in order to solve the above-described problems of the prior art, and an object of the present invention relates to a rotary switch device of an audiovisual apparatus having a knob, a knob, a dial, etc., and the rotation of the knob on the front panel thereof. Even if it is a case where the fitting structure which controls precision cannot be provided, it is providing the rotary switch apparatus which stored the play of the knob with high precision by simple structure.

  A rotary switch device according to the present invention is a rotary switch device that includes a rotary switch having a case that accommodates the switch portion, a shaft that protrudes from the case and rotates, and a rotary knob that is rotated and engaged with the shaft. A rotation switch case protruding cylindrically from the case and having a cylindrical convex portion whose central axis coincides with the rotation axis of the shaft, and a rotary knob that engages with the shaft; A cylindrical recess that fits with the convex.

  Preferably, in the rotary switch device according to the present invention, the shaft engagement portion of the rotary knob has an internal space defined in a substantially D shape in a cross section orthogonal to the rotation axis of the shaft, and the shaft of the rotary switch is provided with the rotary knob. The portion engaged with the shaft occlusion portion has a substantially D-shaped cross section in a cross-sectional direction orthogonal to the rotation axis of the shaft.

  Preferably, in the rotary switch device according to the present invention, the cylindrical recess of the rotary knob has an internal space defined in a circle centered on the rotational axis of the shaft in a cross section orthogonal to the rotational axis of the shaft. The cylindrical convex portion of the case has a cylindrical curved surface whose maximum outer diameter is substantially equal to the diameter of the internal space.

  Preferably, in the rotary switch device of the present invention, the cylindrical convex portion of the case of the rotary switch has a spiral groove into which the nut is screwed onto the cylindrical curved surface.

  Preferably, in the rotary switch device of the present invention, the rotary knob includes a rotary knob holder in which at least a cylindrical recess is formed, and a rotary knob body that meshes with the rotary knob holder.

  Preferably, in the rotary switch device of the present invention, the rotary knob holder further has a shaft engagement portion.

  Preferably, in the rotary switch device of the present invention, the rotary knob holder is made of resin, and the rotary knob body is made of a metal containing aluminum.

  Moreover, the audiovisual apparatus of the present invention includes any one of the rotary switch devices described above.

  The operation of the present invention will be described below.

  The rotation switch device of the present invention includes a rotation switch having a case that accommodates the switch portion, a shaft that protrudes from the case and rotates, and a rotation knob that is engaged with the shaft and rotated. In the audiovisual apparatus in which the rotary switch device of the present invention is used, the user operates the rotary switch via the rotary knob.

  The rotary knob includes a shaft occlusion portion that engages with the shaft of the rotary switch. The shaft engagement portion of the rotary knob has an internal space defined in a substantially D shape in a cross section orthogonal to the rotation axis of the shaft, and meshes with a shaft of a rotary switch having a substantially D shape cross section in the same cross sectional direction. Therefore, the user can operate the rotary switch by rotating the shaft of the rotary switch via the biting rotary knob. The rotary knob includes a cylindrical recess having an internal space defined in a circular shape in a cross section orthogonal to the rotation axis of the shaft. The circle that defines the internal space of the cylindrical recess has a central axis that coincides with the rotational axis of the shaft.

  On the other hand, the case of the rotary switch includes a cylindrical convex portion that protrudes in a cylindrical shape from the case and whose central axis coincides with the rotational axis of the shaft. The cylindrical convex portion has a cylindrical curved surface whose maximum outer diameter is substantially equal to the diameter of the internal space. Preferably, the cylindrical curved surface may have a spiral groove into which the nut is screwed. Since the central axis of the cylindrical convex portion protruding from the case of the rotary switch coincides with the rotational axis of the shaft, it is fitted with the cylindrical concave portion of the rotary knob to restrict the rotational accuracy of the rotary knob. Therefore, the rattling of the knob of the rotary switch device can be kept with high accuracy with a simple configuration.

  Preferably, the rotary knob is composed of a rotary knob holder in which at least a cylindrical recess is formed, and a rotary knob body engaged with the rotary knob holder. The rotary knob holder may further have a shaft engagement portion. The rotary knob holder is made of resin, and the rotary knob body is made of a metal containing aluminum. Also in an audiovisual apparatus using a front panel made of a metal including aluminum, a rotary switch device in which the rotational accuracy of the rotary knob is increased and the backlash is reduced is provided.

  The rotary switch device of the present invention and the audiovisual apparatus using the rotary switch device have a simple configuration and can hold back the knob of the rotary switch with high accuracy.

  The rotary switch device according to the present invention and the audiovisual apparatus using the rotary switch device have a simple structure and the rattle of the knob even when the fitting structure for restricting the rotation accuracy of the knob cannot be provided on the front panel. For the purpose of providing a rotary switch device stored with high accuracy, the rotary switch device has a case that houses the switch part, a shaft that protrudes from the case, and a shaft that rotates. A rotary switch device, wherein the rotary switch case includes a cylindrical projection that protrudes cylindrically from the case and whose central axis coincides with the rotational axis of the shaft. However, this is realized by including a shaft occlusion portion that meshes with the shaft and a cylindrical concave portion that fits with the cylindrical convex portion.

  Hereinafter, although the rotation switch apparatus by the preferred embodiment of this invention and the audiovisual apparatus using the same are demonstrated, this invention is not limited to these embodiment.

  FIG. 1 is a diagram for explaining a rotary switch device 1 according to a preferred embodiment of the present invention, and is a diagram of an operation part of an audiovisual apparatus (not shown in its entirety) provided with the rotary switch device 1 as viewed from the front. For example, the rotary switch device 1 is a selector that selects an input / output signal or a function of an audiovisual equipment such as an AV receiver by rotating a rotary knob 2 protruding from the front panel 3. A rotation switch 10 (not shown in FIG. 1) is provided via the rotary knob 2. The rotary knob 2 rotates about a Z axis that passes through the intersection of the X-X ′ axis and the Y-Y ′ axis and is orthogonal to these axes. The rotary knob 2 includes a rotary knob holder 21 described later, and a rotary knob body 26 that meshes with the rotary knob holder 21.

  FIG. 2 is a Y-Y ′ cross-sectional view illustrating the rotary switch device 1. FIG. 3 is a cross-sectional view taken along the line Y-Y ′ for explaining the components constituting the rotary switch device 1 in the Z-axis direction. In FIGS. 1 to 3, portions unnecessary for description and the internal structure of the rotary switch 10 are omitted.

  The rotary switch device 1 is provided on the front panel 3 of the audiovisual apparatus, and the front panel 3 is connected to the top plate 4 on the upper surface side and the bottom plate 5 on the lower surface side. The front panel 3 is a member formed by injection molding of resin, for example, and includes a circular hole 31 centered on the Z axis and a recess 32 that accommodates a part of the rotary knob 2. A bracket 6 for fixing the rotary switch 10 is provided on the inner surface side of the front panel 3, and is connected to the front panel 3 or the top plate 4 and the bottom plate 5. The bracket 6 is a member formed by pressing a metal plate, includes a circular hole 61 centered on the Z axis, and fixes the rotary switch 10 with a nut 7 described later.

  On the inner surface side of the front panel 3, the rotary switch 10 is electrically connected to the substrate 8 via terminals 15 and 16. The rotation switch 10 includes a case 11 that houses a switch portion (not shown), and a shaft 12 that protrudes from the case 11 and rotates about the Z axis as a rotation axis. When the shaft 12 rotates, the electrical connection in the switch section in the case 11 is changed, and the rotation switch device 1 functions as a selector. The shaft 12 is such that the tip side is cut out of a part of the cylinder, and has a substantially D-shaped cross section in the A-A ′ cross section orthogonal to the Z axis. In addition, the front end side of the shaft 12 provided with this substantially D-shaped cross section is referred to as a D-cut 13.

  The case 11 of the rotary switch 10 includes a cylindrical convex portion 14 that protrudes from the case 11 in a cylindrical shape and whose central axis coincides with the rotational axis of the shaft 12 (that is, the Z axis). The cylindrical curved surface forming the cylindrical convex portion 14 is provided with a spiral groove into which the nut 7 is screwed, so that the rotary switch 10 can be fixed to the circular hole 61 of the bracket 6. That is, since the bracket 6 is sandwiched between the nut 7 screwed into the spiral groove of the cylindrical convex portion 14 and the case 11 of the rotary switch 10, the rotary switch 10 is firmly fixed to the bracket 6.

  The rotary knob 2 includes a rotary knob holder 21 and a rotary knob body 26 that meshes with the rotary knob holder 21. The rotary knob holder 21 includes a shaft engagement portion 22 that engages with the D cut 13 of the shaft 12 of the rotation switch 10. The shaft occlusion portion 22 has an internal space defined in a substantially D shape in a cross section orthogonal to the rotation axis of the shaft 12 and meshes with the D cut 13 having a substantially D shape cross section in the same cross section direction. A dotted line indicating the rotary knob holder 21 in FIG. 1 projects a B-B ′ cross section orthogonal to the Z axis of the rotary knob holder 21. The rotary knob body 26 includes a rotary knob holder 21 and a cylindrical recess 27 that meshes with the rotary knob holder 21, and constitutes the rotary knob 2. Therefore, the user who operates the rotary switch device 1 of the audiovisual apparatus can rotate the shaft 12 of the rotary switch 10 via the engaged rotary knob 2.

  The rotary knob holder 21 includes a cylindrical recess 23 having an internal space defined in a circular shape in a cross section orthogonal to the Z axis. The circle that defines the internal space of the cylindrical recess 23 has a central axis that coincides with the Z axis, that is, the rotational axis of the shaft 12. The diameter φC of the internal space of the cylindrical recess 23 is preferably substantially equal to the diameter φD of the cylindrical curved surface that forms the cylindrical protrusion 14 of the rotary switch 10. φC may be slightly larger than φD, and it is sufficient if φC ≧ φD. As a result, the cylindrical convex portion 14 is fitted with the cylindrical concave portion 23 to regulate the rotational accuracy of the rotary knob holder 21. That is, when the shaft 12 of the rotary switch 10 rotates, even if the shaft 12 has a backlash that is allowed for the reasons of the structure of the switch portion, the cylindrical protrusion 14 is fitted to the rotary knob holder 21. The rotational accuracy of the shaft 12 can be regulated by providing the cylindrical recess 23 to be joined. As a result, the play of the rotary knob 2 of the rotary switch device 1 can be stored with high accuracy.

  For example, the diameter of the shaft 12 of the rotary switch 10 is 6.0 mm, the backlash in the X-axis direction and the Y-axis direction at the shaft tip is ± 1.0 mm or less, and the cylindrical curved surface forming the cylindrical convex portion 14 of the rotary switch 10 When the diameter φD is 8.80 mm, rattling can be suppressed by setting the diameter φC of the internal space of the cylindrical recess 23 of the rotary knob holder 21 to 8.85 mm to 9.00 mm. Since the cylindrical convex portion 14 and the cylindrical concave portion 23 are fitted, the backlash of the shaft 12, that is, the backlash of the rotary knob 2 is regulated to | φC−φD | ≦ 0.20 mm or less, which is more than ± 1.0 mm. This is because it becomes smaller. Preferably, by setting the diameter φC to 8.90 mm to 8.95 mm, it is possible to realize the rotary switch device 1 with high accuracy that hardly rattles.

  Since the cylindrical curved surface forming the cylindrical convex portion 14 of the rotary switch 10 is provided with a spiral groove into which the nut 7 is screwed, the depth of the internal space of the cylindrical concave portion 23 of the rotary knob holder 21 fitted therewith is provided. The length is determined so as not to come into contact with the nut 7 when fitted to the shaft 12 and to be fitted over a sufficient length. Specifically, for example, in the case of the rotary switch 10 described in the preceding stage, the nut 7 is an M9 nut, and the cylindrical convex portion 14 and the cylindrical concave portion 23 are 3.5 mm or more in the Z-axis direction. It suffices if it is fitted over the two. As a result, a highly accurate rotary switch device 1 that is hardly rattled is realized.

  A rotary knob body 26 that meshes with the rotary knob holder 21 constitutes the rotary knob 2. For example, specifically, the rotary knob holder 21 is made of resin, and the rotary knob body 26 is made of a metal containing aluminum. For reasons of aesthetics or tactile sensation, even if the rotary knob 2 of the rotary switch device 1 of the audiovisual apparatus is made of metal containing aluminum when viewed from the front side, the entire rotary knob 2 is made of metal. In addition, the rotary switch device 1 can be realized with a light weight and a low cost, and with a high degree of accuracy with little play. At the same time, the eccentricity at the time of rotation of the rotary knob 2 is reduced, and the sense of precision of the rotary switch device 1 is improved.

  In addition, this invention is not limited to the said Example. When the rotary switch 10 is attached to the bracket 6, if the spiral groove into which the nut 7 is screwed is not provided on the cylindrical curved surface forming the cylindrical convex portion 14, the rotary switch 10 is not fixed by the nut 7 but by other fixing means. What is necessary is just to attach to the bracket 6. For example, if a screw hole for connecting to the bracket 6 is provided in the case 11 of the rotary switch 10, it may be fixed with a screw. Of course, the bracket 6 may be connected to any of the front panel 3, top plate 4 or bottom plate 5 constituting the chassis of the audiovisual apparatus, and may be integrated with these chassis constituent members. . Further, when the bracket 6 is omitted, it may be simply fixed to the substrate 8.

  Further, the rotary knob 2 may be configured integrally with a rotary knob body 26 that meshes with the rotary knob holder 21. The rotary knob 2 only needs to include a shaft occlusion portion 22 that engages with the shaft 12 and a cylindrical recess portion 23 that fits with the cylindrical protrusion portion 14. The shaft occlusion portion 22 is not limited to the D cut, and can be selected according to the shape of the tip portion of the shaft 12 as long as it is a combination that interlocks with the shaft 12. The cylindrical recess 23 of the rotary knob 2 only needs to be fitted with the cylindrical protrusion 14 of the rotary switch 10.

  The rotary switch device 1 is not limited to a selector that selects an input / output signal or a function of an audiovisual device such as an AV receiver. The rotary switch 10 may be a device provided with a rotary encoder or a shaft such as a volume that rotates around a rotation axis, and a rotary switch configured by attaching a knob, knob, dial, or the like to the shaft of the device. Any device may be used.

  The rotary switch device of the present invention can be applied not only to audiovisual equipment but also to electric and electronic devices that include an operation device that is rotated by a user.

It is a figure explaining the rotary switch apparatus 1 by preferable embodiment of this invention. Example 1 It is sectional drawing explaining the rotary switch apparatus 1 by preferable embodiment of this invention. Example 1 It is sectional drawing explaining the rotary switch apparatus 1 by preferable embodiment of this invention. Example 1

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotation switch apparatus 2 Rotation knob 3 Front panel 4 Top plate 5 Bottom plate 6 Bracket 7 Nut 10 Rotation switch 11 Case 12 Shaft 13 D cut 14 Cylindrical convex part 21 Rotation knob holder 22 Shaft occlusion part 23 Cylindrical concave part 26 Rotation knob body 27 Cylindrical recess

Claims (8)

A rotation switch having a case that houses the switch portion, and a shaft that projects and rotates from the case;
A rotary knob that is engaged with and rotated by the shaft;
A rotary switch device comprising:
The case of the rotation switch includes a cylindrical protrusion that protrudes cylindrically from the case and whose central axis coincides with the rotation axis of the shaft,
The rotary knob includes a shaft occlusion portion that meshes with the shaft, and a cylindrical concave portion that fits with the cylindrical convex portion.
Rotary switch device. The shaft engagement portion of the rotary knob has an internal space defined in a substantially D shape in a cross section orthogonal to the rotation axis of the shaft,
The shaft of the rotary switch has a substantially D-shaped cross section in a cross-sectional direction orthogonal to the rotation axis of the shaft at a portion that meshes with a shaft occlusion portion of the rotary knob.
The rotary switch device according to claim 1. The cylindrical recess of the rotary knob has an internal space defined in a circle centered on the rotational axis of the shaft in a cross section orthogonal to the rotational axis of the shaft,
The cylindrical convex portion of the case of the rotary switch has a cylindrical curved surface whose maximum outer diameter is substantially equal to the diameter of the internal space.
The rotary switch device according to claim 1. The cylindrical convex portion of the case of the rotary switch has a spiral groove into which the nut is screwed onto the cylindrical curved surface.
The rotary switch device according to claim 3. The rotary knob is composed of a rotary knob holder in which at least the cylindrical recess is formed, and a rotary knob body engaged with the rotary knob holder.
The rotation switch apparatus in any one of Claim 1 to 4. The rotary knob holder further has the shaft occlusion portion,
The rotary switch device according to claim 5. The rotary knob holder is made of resin, and the rotary knob body is made of a metal containing aluminum.
The rotary switch device according to claim 5. An audiovisual apparatus comprising the rotary switch device according to claim 1.

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