The present invention relates to rotary operation type electronic components which are used mainly in portable electronic devices and allow the electrical resistance between terminals to be changed or allow electrical connection between terminals to be switched by rotation of a control shaft.
Rotary switches or rotary variable resistors (these components will be collectively referred to as rotary operation type electronic components) used, for example, in portable electronic devices may be operated by a gloved hand or in an environment where it is difficult to work with precision. Those portable electronic devices are accordingly required to have rotary operation type electronic components having a large rotary-operation knob for easier operation. The larger the operation knob becomes, however, the more the operation torque is applied to the control shaft. Therefore, an erroneous operation is likely to happen if the operation knob is turned excessively, or is turned unintentionally due to an unexpected force from the outside or when the operator is startled by a sudden sound or light. Rotary operation type electronic components reduced in size for miniaturized portable electronic devices have naturally reduced the operation torque required for rotary operation and have the problem of increasing the possibility of similar erroneous operation. Accordingly, a rotary operation type electronic component that requires a large torque for the turning operation is proposed in Patent literature 1.
In the structure disclosed in Patent literature 1 as shown in
An object of the present invention is to provide a rotary operation type electronic component that can be designed and manufactured more easily than conventional ones.
To solve the above-described problems, a rotary operation type electronic component according to the present invention includes a columnar control shaft; a shaft supporter having a circular through shaft hole into which the control shaft is inserted; an electrical signal control section which is attached to one end of the shaft supporter and allows an electrical signal to be controlled by rotary operation of the control shaft; and a cylindrical spring which is held to encircle the outer periphery of the control shaft, in a ring-shaped spring holding space formed between the outer periphery of the control shaft and the inner periphery of the through shaft hole, and has a ring shape with an opening cut in the direction of the central axis. The cylindrical spring includes a plurality of leaf spring portions which extend in the direction of the central axis of the control shaft, are connected together in the circumferential direction of the control shaft, and are arranged on the outer periphery of the control shaft. The plurality of leaf spring portions have curved projection portions formed by curving their central areas in the length direction to project toward the same side, which is the radially inner or outer side of the cylindrical spring, are placed resiliently between the outer periphery of the control shaft and the inner periphery of the through shaft hole, and are given radially opposite pressing forces at both end portions of the leaf spring portions and the curved projection portions.
Since the number of cylindrically arranged leaf spring portions and the largest amount of bending of the leaf spring portions can be specified independently of each other according to the present invention, it becomes easy to design rotary operation type electronic components and it becomes possible to reduce the size of those components.
Now, an embodiment of the present invention will be described in detail.
The columnar control shaft 10 includes a columnar control portion 11 with a flat face 11a formed by cutting off a portion of a desired length parallel to the central axis X, a columnar intermediate portion 12 extended coaxially from the control portion 11 and having a smaller diameter, a columnar retention portion 13 extended coaxially from the intermediate portion 12, having a further smaller diameter, and having the cylindrical spring 20 around it, and a columnar drive portion 14 extended coaxially from the retention portion 13 and having a further smaller diameter. A step 13s is formed on the boundary between the intermediate portion 12 and the retention portion 13.
The retention portion 13 has a ring-shaped groove 13a formed for the retaining ring 50 to be put on the outer periphery, near the edge on the side of the drive portion. The drive portion 14 has cut faces formed parallel to each other and parallel to the central axis X on both sides of the central axis X and engages with a turning mechanism, which is not shown in the figures, in a housing 41. With the flat faces 11a formed on the control portion 11, the relative rotational position of the mounting hole of an operation knob, which is not shown in the figures, to be mounted on the control portion 11 can be determined.
The cylindrical spring 20 has a plurality of rectangular leaf spring portions 20A that are arranged at intervals in the circumferential direction on the periphery of a hidden virtual column, as shown in
The shaft supporter 30 includes a base portion 31 having a square block shape and a cylindrical portion 32 rising at a right angle from the front face of the base portion. The cylindrical portion 32 has a circular through shaft hole 32A around the central axis X, and a tapered face 32d the diameter of which increases outward is formed at the tip of the through shaft hole 32A. The through shaft hole 32A is formed at the tip of the cylindrical portion 32 and has a large-diameter shaft hole portion 32a the inside diameter of which is larger than the inside diameter of the area into which the intermediate portion 12 of the control shaft 10 is inserted so as to fit, or the outside diameter of the intermediate portion 12, and a small-diameter shaft hole portion 32b with a further smaller inside diameter, into which the retention portion 13 of the control shaft 10 is inserted so as to fit, the inside diameter being larger than the outside diameter of the retention portion 13 and smaller than the outside diameter of the intermediate portion 12, and a step 32s is formed on the boundary between the large-diameter shaft hole portion 32a and the small-diameter shaft hole portion 32b. The back end of the small-diameter shaft hole portion 32b is placed next to the edge of the ring-shaped groove 13a on the side of the intermediate portion 12 in the state in which the control shaft 10 is attached to the shaft supporter 30, and the inside diameter of the through shaft hole 32A is enlarged from the back end of the small-diameter shaft hole portion 32b and provides an enlarged shaft hole portion 32c. In the base portion 31, a connection space 31A is formed for connection to the back face, by enlarging the enlarged shaft hole portion 32c further. The length of the intermediate portion 12 in the direction of the central axis X is smaller than the length of the large-diameter shaft hole portion 32a in the direction of the central axis X, and a ring-shaped spring holding space 33 is formed between the inner periphery of the large-diameter shaft hole portion 32a and the outer periphery of the intermediate portion 12 in the state in which the control shaft 10 is inserted deepest into the through shaft hole 32A.
The electrical signal control section 40 has a rectangular parallelepiped shape that includes a single face matching with the quadrilateral back face of the base portion 31, and includes the housing 41, which includes a variable resistor or a switch that is turned and driven by the drive portion 14, a cover 42 that covers the opening of the housing, terminals 43 where electrical signals are input and output, and set screws 44 that secure the housing 41 to the base portion 31. The cover 42 has a hole 42a from which the drive portion 14 is inserted into the housing 41. An example of a rotary operation type electronic component having a switch as the electrical signal control section 40 is disclosed, for example, in Japanese Patent Application Laid Open No. 2010-218883. Examples of rotary operation type electronic components having a variable resistor as the electrical signal control section 40 are disclosed, for example, in Japanese Patent Application Laid Open No. 2010-186792 or Japanese Patent Application Laid Open No. 2006-147832. As an example of the electrical signal control section 40, an angle sensor using a magnet and a magnetic sensor that can be turned relatively is disclosed in Japanese Patent Application Laid Open No. H8-236314.
The control shaft 10 is locked to the shaft supporter 30 when the ring-shaped groove 13a of the retention portion 13 is placed next to and outside the small-diameter shaft hole portion 32b and the retaining ring 50 is attached to the ring-shaped groove 13a, in the state in which the cylindrical spring 20 shown in
The cylindrical spring 20 is formed as described below. By forming at regular intervals, in a rectangular metal sheet having spring characteristics, an array of rectangular slits 20D long in the direction of the shorter side of the metal sheet (hereafter width direction) and parallel to one another, a plurality of rectangular leaf spring portions 20A connected by two connecting bands 20B at both ends are formed. All the leaf spring portions 20A are pressed together to be curved so that the central areas of the leaf spring portions 20A in their length direction project to the same side with respect to the face of the original metal sheet. The cylindrical spring 20 is obtained by rolling the two connecting bands 20B connecting the leaf spring portions 20A in a direction such that the curved areas project radially outward, until the leaf spring portions 20A located at both ends of the array of leaf spring portions 20A connected by the two connecting bands 20B become next to each other.
The connecting bands 20B serve as both end portions 20Ab of the leaf spring portions 20A. The ends of the leaf spring portions act as fulcrums, and the curved projecting central areas act as points of application.
Since the minimum inside diameter of the cylindrical spring 20 (inside diameter of the connecting bands 20B) in a free state is set smaller than the outside diameter of the retention portion 13, when the cylindrical spring 20 is mounted to the retention portion 13, the opening 20C between the adjacent leaf spring portions 20A in both ends of the array is widened resiliently, and the cylindrical spring 20 is held onto the retention portion 13 by the spring force. It is designed that the maximum outside diameter (outside diameter in the central areas of the leaf spring portions 20A) of the cylindrical spring 20 in that state becomes larger than the inside diameter of the large-diameter shaft hole portion 32a of the through shaft hole 32A. Accordingly, when the control shaft 10 with the cylindrical spring 20 mounted thereto is inserted into the shaft supporter 30, the leaf spring portions 20A are deformed resiliently so as to be pressed radially inward by the inner periphery of the large-diameter shaft hole portion 32a such that the radial height of the leaf spring portions 20A with respect to the retention portion 13 is lowered toward the central axis X, and so as to have an increased length of the leaf spring portions 20A in the direction of the central axis X. This exerts radially opposite pressing forces on the curved projection portions 20Aa and the both end portions 20Ab of the leaf spring portions 20A, generating pressure P1 between the curved projection portions 20Aa forming the outer periphery of the leaf spring portions 20A and the inner periphery of the through shaft hole 32A and pressure P2 between the inner periphery of the connecting bands 20B forming the both end portions 20Ab of the leaf spring portions 20A and the outer periphery of the retention portion 13. Since the latter pressure P2 includes a pressure at which the cylindrical spring 20 holds the retention portion 13 resiliently, P1<P2. The connecting bands 20B are deformed in a ring shape so that the surface of the inner periphery contracts, and the contraction increases the roughness of the surface. On the other hand, the surface of the outer periphery of the leaf spring portions 20A is curved and expanded, decreasing the surface roughness. As a result, the static frictional force between the leaf spring portions 20A and the inner periphery of the through shaft hole 32A becomes smaller than the static frictional force between the connecting bands 20B and the outer periphery of the retention portion 13. When the control shaft 10 is rotated, the cylindrical spring 20 rotates together with the control shaft 10 (that is, the cylindrical spring 20 does not rotate relatively with respect to the control shaft 10) while rotating slidably on the inner periphery of the through shaft hole 32A.
To increase the torque needed for the turning operation, the friction between the cylindrical spring 20 and the shaft supporter 30 should be increased. According to the present invention, the friction can be increased easily by increasing the number of leaf spring portions 20A in the cylindrical spring 20 and by increasing the largest possible amount of resilient displacement of the leaf spring portions 20A (height of the curves of the leaf spring portions 20A). Since the number of leaf spring portions 20A and the possible amount of displacement can be selected independently of each other, the high degree of freedom in design makes it easy to design and manufacture small rotary operation type electronic components.
[Modifications on Cylindrical Spring]
In the embodiment using the cylindrical spring 20 as shown in
In the modification shown in
The present invention can be applied to variable resistors or switches in portable wireless devices, for example.
Number | Date | Country | Kind |
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2012-267990 | Dec 2012 | JP | national |
Filing Document | Filing Date | Country | Kind |
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PCT/JP2013/079982 | 11/6/2013 | WO | 00 |