JPS63168001A - Rotary knob structure of electronic component - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a knob structure for an electronic component.

[Conventional technology]

Various knobs are attached to electronic components such as small radio receivers, and these knobs are used to adjust channel selection, volume, etc. That is, when these knobs are rotated, other parts (such as a rotary resistor) that are linked to the rotation of the knobs rotate, thereby adjusting channel selection, volume, etc.

[Problem that the invention seeks to solve]

However, with such a conventional knob structure,
There has been a problem in that if the knob is rotated forcibly in any one direction after it has been fully rotated, the knob locking mechanism or gear mechanism of the knob structure may be destroyed. .

The present invention has been made in view of the above-mentioned points, and even if the knob is rotated forcibly in any one direction, even if the knob is forcibly rotated, the knob locking mechanism and gear mechanism of the knob structure will be damaged. The present invention provides a rotating knob structure for electronic components that does not cause damage to the electronic components.

[Means for solving problems]

In order to solve the above problems, the present invention provides a rotary knob structure of an electronic component with a hole 11c in the center of which the clutch shaft 2 is inserted.
A rotary knob 1 having a shaft support part 11 in which a groove is formed and a groove that crosses the hole, and a shaft support part 11 that fits on the outer periphery of the shaft support part 11 of the rotary knob 1 and is connected to the shaft support part 11 through the groove lie. It has an elastic ring 7 that narrows the shaft support part 11, and a fitting shaft part 2b that is press-fitted into the hole lie of the shaft support part 11 into which the elastic ring 7 is fitted, and transmits the rotational force of the rotation knob 1 to the outside. A clutch shaft 2 having a rotational force transmitting portion 21 is provided.

[Effect]

By configuring the rotary knob structure of the electronic component as described above, after rotating the rotary knob 1 to its locking position,
Furthermore, even if you try to forcibly rotate the rotating knob 1 in the same direction, the shaft support part 11 of the rotating knob 1 and the fitting shaft part 2b of the clutch shaft 2 will frictionally engage with each other due to the elastic force of the elastic ring 7. Therefore, a slip occurs between the shaft support portion 11 and the fitting shaft portion 2b, and only the rotary knob 1 rotates in the same direction.

Therefore, even if the rotating knob 1 is forcibly rotated in the same direction, the other parts that are interlocked with it will not be moved, and these parts and the rotating knob itself will not be damaged.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 1 is a perspective view showing the basic structure of a rotary knob structure for an electronic component according to the present invention.

The rotary knob structure of the electronic component includes a rotary knob 1 that can rotate clockwise and counterclockwise around a shaft, a clutch shaft 2 supported by a shaft support portion 11 of the rotary knob 1, and a clutch shaft 2 of the clutch shaft 2. It is composed of driven parts 22 and 23 that are engaged with and driven by the rotational force transmission part 21. The rotary knob 1 and the shaft support part 11 are integrally formed of a resin material or the like, and the shaft support part 11 is located in the center of the rotary knob 1, and the fitting shaft part 2b of the clutch shaft 2 is located in the center. It has a cylindrical shape with a hole into which it is inserted, and a groove 11e that crosses the radial direction of the cylinder. Further, an elastic ring 7 having elasticity is fitted to the outer periphery of the shaft support portion 11, and the elastic force of the elastic ring 7 narrows the shaft support portion 11 through the groove lie. The clutch shaft 2 and the rotational force transmission section 21 are also integrally formed of a resin material or the like, and the rotational force transmission section 21 is made of a gear or the like. The driven part 22 is composed of a gear or the like that fits into the rotational force transmission part 21, and the driven part 23 is also composed of a gear or the like.

FIG. 2 is a sectional view of a main part showing the structure of a rotary variable resistor using the rotary knob structure of an electronic component according to the present invention.

As shown in the figure, the rotary variable resistor has a substrate 6 and a case 5.
between the clutch shaft 2. An intermediate gear 3 (corresponding to the driven part 22 in FIG. 1) and a gear 4 (corresponding to the driven part 23 in FIG. 1) are arranged in the slider receiver. In addition, the clutch shaft 2
A rotary knob 1 is fixed to one end of the rotary knob 1. This clutch shaft 2
The rotary knob 1 is fixed to the rotary knob 1 by applying elasticity to a predetermined position of the cylindrical shaft support portion 11 of the rotary knob 1, as will be described in detail later. This is done by narrowing down the fitting shaft portion 2b of the clutch shaft.

In the above rotary knob structure, the clutch shaft 2° intermediate gear 3. The gear 4 is interlocked with the receiver. Further, in the slider receiver, a slider (not shown) is attached to the gear 4, and this slider comes into sliding contact with the resistor pattern and the current collector pattern on the substrate 6. That is, when the rotation knob 1 is rotated, the clutch shaft 2. The intermediate gear 3, the slider 4, and the slider rotate, thereby changing the resistance value between predetermined terminals on the board 6. By the way, in order to limit the rotation range of the slider within the range of sliding contact with the resistor pattern and current collector pattern, the rotation of the slider receiver is stopped by the gear 4 by a predetermined locking mechanism (not shown). If the intermediate gear 3.
The rotation of the clutch shaft 2 is also stopped. At this time, if you try to forcibly rotate the rotary knob 1 in the same direction, slipping will occur between the shaft support part 11 of the rotary knob 1 and the fitting shaft part 2b of the clutch shaft 2, causing each part of the rotary knob structure to It will not be damaged.

Hereinafter, each member constituting the rotary variable resistor using the rotary knob structure of the electronic component described above will be explained in detail.

FIG. 3 shows the rotary knob 1, in which FIG. 3(a) is a plan view, FIG. 3(b) is a side sectional view, and FIG. 3(c) is a bottom view.

The rotary knob 1 has a disc-shaped knob main body 1a made of a synthetic resin material or the like. A circular recess 1b is formed on the back surface of the knob body 1a, and a cylindrical shaft support portion 11 is formed in the center of the recess 1b and protrudes from the recess 1b toward the back surface.
is formed.

Further, a hole lie passing through the knob body 11 is formed in the center of this shaft support part 11, and an outer peripheral groove lid for locking an elastic ring 7, which will be described later, is formed on the outer periphery of this shaft support part 11. This shaft support portion 11 is provided in the radial direction of the support portion 11.
A groove 11e is formed across the groove 11e. Further, the outer edge 11f of the knob main body 11 is carved with fine irregularities (not shown) for making it easier to rotate the rotary knob 1 with fingers.

FIG. 4 shows the clutch shaft 2, in which FIG. 4(a) is a plan view, FIG. 4(b) is a side sectional view, and FIG. 4(c) is a bottom view.

The clutch shaft 2 is integrally formed of synthetic resin or the like. A gear portion 2a (corresponding to the rotational force transmitting portion 21 in FIG. 1) is formed at one end of the clutch shaft 2, and the other end has a size and shape that rotatably fits into the hole lie of the rotary knob 1. A fitting shaft portion 2b is formed. In addition, the gear part 2a
A friction shaft portion 2c is formed between the fitting shaft portion 2b and a friction shaft portion 2c for fitting a leaf spring 8, which will be described below, into its outer periphery. Furthermore, in the center of the gear part 2a, there is a hole 51 of the case 5 as described below.
A shaft portion 2d that engages with the fitting shaft portion 2b is formed, and a conical hole 2c is formed at the tip of the fitting shaft portion 2b.

FIG. 5 is a diagram showing the intermediate gear 3, and FIG. 5(a) is a plan view;
FIG. 5B is a side sectional view, and FIG. 1C is a bottom view.

The intermediate gear 3 is integrally formed of synthetic resin or the like. A shaft portion 3a is formed at the center of the intermediate gear 3. Both ends of the shaft portion 3a are rotatably supported by a case 5 and a base plate 6, which will be described below. The clutch shaft 2 is provided on the outer periphery of this shaft portion 3a.
A first gear part 3b meshes with the gear part 2a of the gear 4, and a second gear part 3C meshes with the gear part 4c of the gear 4.
is formed.

FIG. 6 shows the slider bearing gear 4, in which (a) is a plan view, (b) is a side sectional view, and (C) is a bottom view.

The gear 4 of the slider receiver is a disk-shaped slider receiver made of synthetic resin or the like and has a main body 4a. This slider receiver has a shaft portion 4b formed in the center of the main body 4a, and both ends of which are rotatably supported by a case 5 and a base plate 6, which will be described below. The slider receiver has a circular recess 4c formed on the front side of the main body 4a, and six protrusions 4d for fixing sliders 9, 9 described below are formed on the recess 4C. The slider holder is the main body 4a
A gear portion 4e that meshes with the second gear portion 3c of the intermediate gear 3 is formed on the outer peripheral portion of the intermediate gear 3. Also, the slider holder is the main body 4.
On the back side of a, a circumferential groove 4f is formed near the outer periphery, and a stepped portion 4 is formed in a part of the circumferential groove 4f.
g is formed.

The slider receiver is made by placing the slider 9.9 on the concave gdc of the gear 4 as shown by the dotted line in FIG. .9 is fixed.

A part of the slider 9 is bent upward, and its tips are sliding contact parts 9a and 9b.

They are 9c and 9d.

FIG. 7 is a diagram showing the case 5, where (a) is a plan view, FIG. 7(b) is a view cut along line A-A in FIG.
C) is a bottom view.

The case 5 is integrally formed of synthetic resin or the like. Approximately in the center of this case 5, a gear portion 2 of the clutch shaft is provided.
The first recess 5a has a depth that allows the friction shaft portion 2C to be inserted, and the second recess 5b has a depth that allows the first gear portion 3b and the second gear portion 3C of the intermediate gear 3 to be inserted. The slider receivers of the gear 4 each have deep third and fourth portions 5c into which the main body 4a can be inserted. Note that the first four portions 5a and the second recess 5b have the same depth, but the third recess 5c has a slightly shallower depth.

Further, the shaft portion 2d of the clutch shaft 2, the shaft portion 3a of the intermediate gear 3, and the slider bearing are located at the center of each of the first recess 5a, the second recess 5b, and the third recess 5C. Holes 51a, 51b, and 51c are respectively formed to rotatably support 4b.

Further, a protrusion 5e is formed near the outer edge of the third recess 5c. Note that this protrusion 5c is connected to the slider receiver when the gear 4
This results in engagement with the circumferential groove 4r.

Further, a small circular fourth recess 5g having the same depth as the first fourth portion 5a is formed near the first recess 5a.

Furthermore, a predetermined number of fixing protrusions 5f for fixing a substrate 6, which will be described below, are formed on the plane of the case 5.

FIG. 8 is a plan view showing the substrate 6. FIG.

The substrate 6 has an annular sliding pattern 61 formed on its surface. This sliding pattern 61 is composed of, from the outside, a first resistor pattern 61a (the resistor part is shown in black), a second resistor pattern 61b, a first current collecting pattern 61c, and a second current collecting pattern 61d. ing. Both ends of the first resistor pattern 61a are connected to terminal portions 62a and 6, respectively.
2e. Both ends of the second resistor pattern 61b are connected to terminal portions 62b and 62d, respectively. The first current collection pattern 61c is fully connected to the terminal portion 62c. Further, the second current collection pattern 61d is read directly from the terminal portion 62b.

The board 6 also has a hole 63 formed in a predetermined position into which the fixing protrusion 5r of the case 5 is inserted. A hole 64 for use is formed.

Further, the board 6 includes a fitting shaft portion 2b of the clutch shaft 2,
The shaft portion 3a of the intermediate gear 3 and the slider bearing have a hole portion 65a that rotatably supports the shaft portion 4b of the gear 4.

65b and 65c are formed, respectively.

FIG. 9 is a plan view showing an elastic ring 7 made of an elastic metal material.

By cutting out a part of the elastic ring 7,
A notch 7a is formed. The inner diameter of the elastic ring 7 is smaller than the outer diameter of the outer circumferential groove lid formed in the shaft support portion 11 of the rotary knob 1. The elastic ring 7 is fitted into the outer circumferential groove lid of the shaft support portion 11 of the rotary knob 1, thereby squeezing the shaft support portion 11 with a predetermined elastic force.

FIG. 10 shows a leaf spring 8 made of an elastic metal material, with FIG. 10(a) being a plan view and FIG. 10(b) being a side view.

The leaf spring 8 is formed at both ends with clamping parts 8a, 8a having a shape and size to grip the friction shaft part 2c of the clutch shaft 2. Further, both the clamping parts 8a, 8a are connected by a base part 8b.

Next, how to assemble this electronic component will be explained using FIGS. 2 to 11.

Here, FIG. 11 is a diagram showing a state in which the above-mentioned components other than the board 69 and the elastic ring 7 are arranged on the case S. Note that FIG. 2 is a cross-sectional view taken along line A--A in FIG. 11.

First, as shown in FIG.
The elastic ring 7 is attached to the outer circumferential groove 11d (see FIG. 3) of the outer peripheral groove 11, and the shaft support part 11 is narrowed inward through the groove lie.

Next, the fitting shaft portion 2b of the clutch shaft 2 is inserted into the hole 6 of the board 6.
5a, and also into the hole 11c of the shaft support part 11 of the rotary knob 1 arranged on the back surface of the board 6. At this time, since the shaft support portion 11 of the rotary knob 1 is squeezed inward by the elastic ring 7, the rotary knob 1 and the clutch shaft 2 are fixed integrally.

Next, the tip of the fitting shaft portion 2b of the clutch shaft 2 is hot caulked. This prevents the fitting shaft portion 2b of the clutch shaft 2 from coming out of the hole 11C of the shaft support portion 11 of the rotary knob 1.

Next, the friction shaft portion 2c of the clutch shaft 2 attached to the board 6
The clamping portions 8a, 8a of the leaf spring 8 are fitted into the holes. The fitted state is shown in FIG.

Here, the leaf spring fixing rubber 90 shown in FIG. 11 has a cylindrical shape and is formed with a size that can be inserted into the fourth recess 5g of the case 5. This leaf spring fixing rubber 90 has a longitudinal groove formed on one side thereof, and is attached to the base 8 of the leaf spring 8.
It is fixed at b.

Next, as shown in FIG. 11, the intermediate gear 3 is inserted into the second recess 5b formed in the case 5, and then the sliders 9 are fixed in the third recess 5c. Insert gear 4.

Next, the board 6 to which the rotary knob 1, clutch shaft 2, leaf spring 8, and leaf spring fixing rubber 90 are attached is attached to the case 5. Attaching the board 6 to the case 5 is done by attaching the board 6 to the case 5.
of the clutch shaft 2 by inserting the plurality of holes 63 (see FIG. 8) into the fixing protrusions sr (see FIG. 7) of the case 5.
The gear part 2a is inserted into the first recess 5a of the case 5, and the gear part 2a of the clutch shaft 2 and the first gear part 3b of the intermediate gear 3 mesh with each other, and the leaf spring is attached with a leaf spring fixing rubber 90. 8 into the fourth recess 5 of the case 5.
Finally, the fixing protrusion 5r of the case 5 is heat-stamped to fix the board 6 to the case 5. As a result, the sliding contact portions 9a and 9b at the tips of the sliders 9 and 9 are connected to the second current collecting pattern 61d and the second resistor pattern 61b of the substrate 6, respectively.
The sliding contact portions 9c and 9d contact the first current collecting pattern 61c and the first resistor pattern 61a, respectively.

When the rotary knob 1 is rotated with a finger, the clutch shaft 2 is also rotated together. Also, an intermediate gear 3 interlocking with this clutch shaft 2
The slider receiver also rotates the gear 4. The slider receiver also rotates the sliders 9, 9 fixed to the gear 4, but at this time, the second current collection pattern 61d and the second resistor pattern 61b
Since the terminal parts 62b and 62d are electrically conductive, the resistance value between the terminal parts 62b and 62d changes, and the first current collecting pattern 61c and the first resistor pattern 61a are electrically conductive, so the terminal parts 62a and 62d are electrically conductive.
The resistance value between 62c and between terminal portions 62e and 620 changes.

The friction shaft portion 2C of the clutch shaft 2 is held between the clamping portions 8a, 8a of the leaf spring 8, and the base portion 8b of the leaf spring 8 is secured to the fourth portion 5g of the case 5 by a leaf spring fixing rubber 90.
is fixed. Therefore, a predetermined friction torque is generated in the rotation of the clutch shaft 2, that is, in the rotation of the rotation knob 1.

When the gear 4 is rotating, the slider receiver has a circumferential groove 4r formed on the gear 4 and a protrusion 5e formed on the case 5, and the sliding The rotor bridge guides the rotation of the gear 4.

Here, as the slider receiver continues to rotate the gear 4, the protrusion 5e of the case 5 comes into contact with the stepped portion 4g formed on the gear 4, and the slider receiver prevents the gear 4 from rotating. Therefore, intermediate gear 3. Rotation of the clutch shaft 22 rotation knob 1 is also prevented.

At this time, if you try to forcibly rotate the rotary knob 1 in the same direction, the rotary knob 1 and the clutch shaft 2 will be separated by the elastic ring 7.
Because they are only united by the inward elastic force of It will rotate in the direction.

Therefore, even if the rotary knob 1 is forcibly rotated in the same direction, the parts constituting the rotary knob structure will not be damaged.

Further, when the rotary knob 1 is rotated in the power direction, the rotary knob 1 and the clutch shaft 2 rotate together, and the intermediate gear 3. The slider receiver also rotates the gear 4. When the step portion 4g of the gear 4 and the protrusion 5c of the case 5 come into contact with each other on opposite sides of the slider receiver, the rotary knob 1 rotates freely in the same manner as described above.

The relationship between the rotational pressure ml of the rotary knob 1 and the rotational torque T of the rotary knob 1 at this time is shown in FIG.

Here, in the slider receiver, the circumferential groove 4f of the gear 4 and the protrusion 5c of the case 5 engage, and the slider receiver is in contact with the protrusion 5e when the slider receiver is guiding the rotation of the gear 4, that is, the knob rotation distance. is J21
When the rotational torque T is in the range from P2 to P2, the rotational torque T of the rotary knob 1 is a predetermined torque T1 produced by the leaf spring 8.

Next, the slider receiver is connected to the stepped portion 4g of the gear 4 and the protrusion 5e of the case 5.
When they touch, that is, the knob rotation distance! but! 1~!
If the range of 2 is exceeded and the rotational torque T of the rotary knob 1 becomes 12 or more against the elastic force of the elastic ring 7, slippage occurs between the shaft support portion 11 and the fitting shaft portion 2b.

Here, the torque T1 is applied to the clamping portion 8a of the leaf spring 8.

By changing the clamping force of the elastic ring 8a, the desired torque T2 can be obtained by changing the elastic force of the elastic ring 7, respectively.

Although an example has been shown in which the rotary knob structure of an electronic component according to the Ikeki invention is used in a rotary variable resistor, the scope of use of the rotary knob structure of an electronic component according to the present invention is not limited to this. Any type of rotating knob can be used as long as it is used as a rotating knob for a part that is rotated by the rotating knob and will be destroyed or damaged if a force exceeding a predetermined rotational force is transmitted. Furthermore, in the above embodiment,
Although the intermediate gear 3 is used as a component that transmits the rotational force from the clutch shaft 2, the component that transmits the rotational force from the clutch shaft 2 is not limited to this, and for example, a rack mechanism configuration or a belt mechanism can be used. Of course, other means of communication may also be used. Further, the shape of the rotary knob body is not limited to a circular shape, but may be any shape as long as it can rotate the shaft support portion.

〔Effect of the invention〕

As explained in detail above, according to the rotary knob structure of an electronic component according to the present invention, even if the rotary knob is further rotated forcefully in the same direction after the rotary knob is rotated to the locking position, the rotation This has the excellent effect of not damaging the knob and other parts interlocking with the rotary knob.

This rotary knob structure for electronic components is particularly effective for modern electronic components where electronic components have become smaller and the strength of each component has decreased.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the basic structure of a rotary knob structure for an electronic component according to the present invention, and FIG. 2 is a main part showing the structure of a rotary variable resistor using the rotary knob structure for an electronic component according to the present invention. A sectional view, FIG. 3 is a diagram showing the rotary knob 1, and the same figure (a)
4 is a plan view, FIG. 4(b) is a side sectional view, FIG. 4(c) is a bottom view, FIG. 4 is a diagram showing the clutch shaft 2, and FIG. 4(a) is a plan view. Figure Cb'') is a side sectional view, Figure (C) is a bottom view, Figure 5 is a diagram showing the intermediate gear 3, Figure (a) is a plan view, Figure (b
) is a side sectional view, FIG. 6(c) is a bottom view, FIG. Figure (c) is a bottom view, Figure 7 is a diagram showing the case 5, Figure (a) is a plan view, Figure (b) is a view cut along the line A-A in Figure (a), and Figure 7 is a view showing the case 5. Figure (c) is a bottom view, Figure 8 is a plan view showing the substrate 6, Figure 9 is a plan view showing the elastic ring 7, Figure 10 is a view showing the leaf spring 8, and Figure (a) is a plan view. , FIG. 11 is a diagram showing the above-mentioned parts other than the base plate 69 and the elastic ring 7 arranged on the case 5, and FIG. 12 is the rotation distance of the rotary knob 1! FIG. 2 is a diagram showing the relationship between the rotational torque T of the rotary knob 1 and the rotational torque T of the rotary knob 1. FIG. In the figure, 1... Rotation knob, 11... Shaft support part, 11
C...hole, lie...groove, 2...clutch shaft, 2
b... Fitting shaft part, 21... Rotational force transmission part, 7...
It is an elastic ring.

Claims (1)

[Claims] A rotary knob having a shaft support part in which a hole for inserting a clutch shaft is formed in the center part and a groove that crosses the hole; It has an elastic ring that narrows the shaft support, a fitting shaft that is press-fitted into the hole of the shaft support into which the elastic ring is fitted, and a rotational force transmission section that transmits the rotational force of the rotary knob to the outside. A rotary knob structure for an electronic component, characterized by comprising a clutch shaft.