JPH0546098Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of the Invention] The present invention relates to a rotary dial for operating a rotary electronic component such as a variable resistor.

[Prior art and its problems]

(Prior Art) Electronic switches such as photoelectric switches are equipped with adjusting means such as a variable resistor in order to adjust the degree of amplification of the detection circuit. A rotary dial is used to operate such rotary electronic components from outside the case. For example, a conventional rotary dial has a protrusion that fits on the rotating shaft of a rotary electronic component on one side, and a shaft that projects at the center of rotation on the other side, and the shaft is inserted into the case. By inserting the rotary dial into the recess of the case, the rotary dial was attached to the inside of the case so that the rotary electronic components could be operated from outside the case.

(Problem that the invention aims to solve) However, with such conventional rotary dials, when installing the dial, it is necessary to deform the case and insert the shaft of the dial into the recess of the case to install the rotary dial. In addition, there was a problem that the rotary dial could fall off due to variations in the dimensional tolerance of the case. In addition, it is necessary to provide a recess in the disc of the case, into which the rotary shaft is fitted, which corresponds precisely to the position corresponding to the shaft of the rotary dial, complicating the manufacturing process.

[Purpose of invention]

The present invention was developed in view of the problems of rotary dials attached to conventional electronic devices.The present invention absorbs variations in the position of the case and rotary electronic components, and has a recess for rotation on the inner surface of the case. The technical challenge is to make it unnecessary.

[Structure and effect of the idea]

(Means for Solving the Problems) The present invention is a rotary dial for operating rotary electronic components such as variable resistors. A mounting portion connected to the rotating shaft of the rotary electronic component having a protrusion that fits into the operation groove of the rotary electronic component is provided, and a mounting portion having elasticity in the direction of the rotation axis around the center of rotation on the other side, It is characterized by forming a plurality of protrusions that bring the part into contact with the inner wall of the case, and forming an operating disc having the same rotation axis as the protrusions and forming the outermost periphery of the rotary dial. It is something.

(Function) According to the present invention having such features, the fitting portion provided on one side of the rotary dial is inserted into the rotation groove of the rotary electronic component and is formed so that it can rotate in conjunction with the rotary dial. The other surface of the dial has elasticity, and a protrusion provided on the side surface is in contact with the inner surface of the case. By rotating the dial, the rotary electronic component can be rotated while in contact with the dial.

(Effect of the invention) Therefore, according to the invention, since the rotary dial is held between the inner wall of the case and the rotary electronic component by the elastic projection attached to the rotary dial, a recess is formed at the mounting position inside the case. There is no need to provide one. Therefore, by setting the distance between the rotating electronic component and the inner surface of the case to a predetermined value, it becomes possible to mount the rotating electronic component at any position on the printed circuit board, etc., thereby increasing the degree of freedom in circuit design. Can be done. Moreover, the manufacturing process of the case is also simplified. Furthermore, since the rotary dial is pressed against the electronic component side by the elastic protrusion, it is possible to absorb variations in size between the mounting position of the printed circuit board and the case.

[Explanation of Examples]

Fig. 1a is a front view of a rotary dial according to an embodiment of the present invention, Fig. 1b is a side view thereof, Fig. 1c
is a rear view, and FIG. 2 is a sectional view taken along line A-A. The rotary dial 1 has a central cylinder part 2 shown in FIG. It is formed in one piece. The operation disk 3 has triangular notches formed around its entire periphery so that it can be easily operated from the outside, and is held so as to protrude to the outside of the electronic device. Further, a scale corresponding to the rotation angle is written on the outer peripheral surface of the central cylindrical portion 2. The cylindrical portion 4 on the left side has a groove 4a having a U-shaped cross section corresponding to the outer shape of the rotating shaft of a rotary electronic component, such as a variable resistor, to which the rotary dial 1 is attached, and a protrusion 4b protruding from the center thereof. It forms the attachment part for rotary electronic components. The protrusion 4b has the same shape as a flathead screwdriver for operating the rotation axis of the variable resistor.

Now, three arcuate through holes 5, 6, and 7 are provided at symmetrical positions from the center of the cylindrical portion 2. Arc-shaped protrusions 8, 9, 10 are formed on the end faces of the through holes 5, 6, 7 from the end of the operating disk 3 along the shapes of the through holes 5-7 as shown in the figure. Projections 8-10
Each has one end fixed to the end of the cylindrical portion 2 and the other end not fixed, so that they are elastic members having elasticity in the axial direction. Further, on the side surface of the cylindrical portion 2, there is a hemispherical body 11 that slightly protrudes from the side surface of the operating disk 3.
is provided. The tips of the protrusions 8 to 11 have surfaces substantially parallel to the side surfaces of the operating disc 3, as shown in FIG. It is configured as follows.

FIG. 3a is a front view of the electronic device to which the rotary dial constructed in this manner is attached, and FIG. 3b is a back view of the electronic device with the back plate removed. In these figures, a rotary electronic component such as a variable resistor 21 is mounted on a printed circuit board 20. A groove in the cylindrical portion 4 of the rotary dial 1 according to the present embodiment is fitted into the variable resistor 21, and the protrusion 4b is fitted into the variable resistor 21.
into the recess of the variable resistor 21 and
1 and the rotary dial 1 are interlocked. Then, the printed circuit board 20 is inserted into the case 22 at a predetermined position. At this time, when the protrusions 8 to 10 protruding from the side wall of the operating disc 3 are pressed against the inner surface of the case 22,
The projections 8 to 10 contract and the apex of the hemisphere 11 comes into contact with the inner wall of the case 22, sliding on the inner wall of the case 22 and fixed in a predetermined position. In this way, the rotary dial 1 is attached between the variable resistor 21 on the printed circuit board 20 and the inner wall of the case 22. As shown in FIG. 3a, the case 22 is preliminarily provided with an opening that exposes the central portions of the operating disk 3 and the cylindrical portion 2.

When operating the electronic switch configured in this way, the rotary dial 1 itself is operated by operating the operation disc 3 protruding from the side surface of the case 22 in the direction of arrow B or C, as shown in FIG. Then, the operating shaft of the variable resistor 21 is rotated. Then, the rotary dial 1 will be rotated by the protrusions 8 to 10.
is pressed toward the variable resistor 21, so that the protrusion slides on the inner wall of the case 22 during rotation, allowing the variable resistor 21 to rotate.

Therefore, when an electronic switch is configured using the rotary dial according to the present invention, there is no need to provide a recess corresponding to the rotation axis on the inner wall of the case, and the positioning between the printed circuit board and the case can be maintained at a predetermined value. It is possible to install the variable resistor in any position by Even if there are variations in the inner walls of the print base 20 and the case 22, the variations are absorbed by the elastic protrusions 8 to 10, so that assembly workability and manufacturing costs can be reduced. Even when the distance between the printed circuit board 20 and the inner wall of the case becomes narrow, the apex of the hemisphere 11 provided on the side surface of the cylindrical portion 2 comes into contact with the inner wall of the case, and the side surface of the operating disc 3 directly contacts the inner wall of the case. Therefore, it is possible to rotate the rotary dial 1 smoothly.

In this embodiment, the operating disk 3 and the cylindrical portion 4 are provided on both sides of the central cylindrical portion 2, but the operating disk 3 may be the disk with the largest diameter. It goes without saying that any shape can be taken without having to be a cylinder or cylinder as long as the diameter is less than the diameter of the operating disk.

Furthermore, although this embodiment describes a rotary dial that changes the resistance value of a rotary variable resistor, it is clear that the present invention can be applied to the dials of various rotary electronic devices such as variable capacitors. Needless to say.

[Brief explanation of the drawing]

Fig. 1a is a front view of a rotary dial according to an embodiment of the present invention, Fig. 1b is a side view thereof, Fig. 1c
2 is a cross-sectional view taken along the line A-A of this embodiment, FIG. 3 a is a front view of an electronic device to which the rotary dial of this embodiment is attached, and FIG. 3 b is a rear view thereof. It is. 1...Rotary dial, 2...Cylindrical part, 3...
Operation disk, 4...Cylindrical portion, 4a...Groove, 4b...
Projection, 5, 6, 7...Through hole, 8, 9, 10...
... protrusion, 11 ... hemisphere, 20 ... printed circuit board, 21 ... variable resistor, 22 ... case.

Claims (1)

[Utility Model Registration Claim] A rotary dial that rotates a rotary electronic component provided within a case, comprising: an attachment portion on one side having a protrusion that fits into an operating groove of the rotary electronic component and is connected to the rotation shaft of the rotary electronic component; and on the other side, a plurality of protrusions are formed around the center of rotation, having elasticity in the direction of the rotation shaft, the ends of which come into contact with the inner wall of the case; and an operation disk that has the same rotation axis as the rotation axis and forms the outermost periphery of the rotary dial.