JP3130133B2 - Rotating electrical parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary electric component which detects a rotational position of a rotating body by a rotational position detector and controls electronic equipment according to the rotational state.

[0002]

2. Description of the Related Art Conventionally, for example, a rotary electric component used for operation control of a VTR has a cam surface corresponding to a rotation angle of a rotary dial plate as disclosed in Japanese Patent Application Laid-Open No. 61-161624. In some cases, a rotary dial plate is formed and a cam roller is pressed against a cam surface to obtain a torque change according to the shape of the cam surface, thereby giving a clicking feeling to the rotation operation.

Further, as a device for giving a click feeling to a rotary operation member, as disclosed in Japanese Utility Model Laid-Open Publication No. 60-94739, a projection biased by a click spring is provided in a recess formed in a rotary plate. Some engage to give a click feeling. Further, as a device that gives a click feeling to the rotation, as disclosed in Japanese Patent Application Laid-Open No. 3-244012 by the present applicant, a plurality of magnets are attached to a metal plate and attached to a rotating body, and In some cases, a magnetic plate having through holes formed at a predetermined pitch is fixed, and a click sensation is given at each predetermined rotation angle by an attractive force between the magnet of the rotating body and the fixed magnetic plate.

[0004]

Among the above-mentioned rotary electric parts of the prior art, those which mechanically give the former click feeling by means of a cam or a spring require a large number of parts, require a large number of assembling steps, and have a poor click feeling. There are drawbacks that adjustment is difficult and durability is poor.

In the latter case of the above-mentioned prior art, it is troublesome to attach the magnet to the metal plate and attach it to the rotating body, and it takes a long time from the application of the adhesive to the hardening, resulting in poor work efficiency. there were. Also, in order to bond the magnet to the metal plate, a layer of adhesive is formed between the magnet and the metal plate, and the magnetic flux density of the magnetic field lines of the magnet is reduced, the magnetic force is weakened, and the click feeling is adversely affected. there were. In addition, the gap between the bonded magnet and the magnetic plate may not be constant due to the undulation of the metal plate, the amount of the applied adhesive, and the erroneous adhesion of the adhesive to the metal plate side of the magnet. There was also a problem that the feeling varied depending on the rotation angle. Also,
There is also a problem that the magnet may come off due to insufficient adhesion between the magnet and the metal plate.

The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a rotary electric component having a simple structure, high accuracy, and a good click feeling. And

[0007]

According to the present invention, a permanent magnet is provided around a rotating shaft, and a magnetic plate having magnetic portions formed at a predetermined pitch is provided so as to face the permanent magnet.
A rotary electric component in which one of the magnet or the magnetic plate is fixed to the rotating shaft and the other is rotatably provided on a rotating body, the resin being a resin having a hole capable of storing the permanent magnet. The hole is formed in a shape in which the hole is opened on the back side and the bottom reaches the vicinity of the front side, and the permanent magnet in the magnet holder which is in contact with the surface of the magnetic plate and is accommodated in the hole is provided. This is a rotary electric component in which a convex portion for keeping the distance from the magnetic plate constant is formed integrally with the magnet holder.

The present invention is also a rotary electric component in which the permanent magnet is housed and fixed in a magnet holder by insert molding.

The present invention is also a rotary electric component in which an auxiliary magnetic plate is provided directly on the back side of the magnet holder in direct contact with the permanent magnet.

[0010]

The mounting of the magnet is completed only by inserting the permanent magnet into the hole of the magnet holder, and the number of assembling steps can be greatly reduced. Further, by providing the permanent magnet on the magnet holder by insert molding, the number of mounting steps can be further reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. The rotary electric component of this embodiment is a VTR
The so-called jog shuttle, which is used for an operation unit for controlling operations such as, for example, the inside rotating body is called a jog, and the outside rotating body is called a shuttle. , Fast forward, rewind, etc. In this embodiment, the PPS
And a substrate 12 such as a paper epoxy resin laminate, a glass epoxy laminate, or a phenol resin laminate on which a conductive pattern is formed concentrically. ing. A slider 14 is in sliding contact with the substrate 12, and the slider 14 is fixed to the back side of the rotating body 16. The rotating body 16 includes a rotating shaft 18 protruding from the chassis 10 through a hole 13 formed in the center of the substrate 12 and the rotating plate 2 integrally formed therearound.
0.

As shown in FIGS. 2 to 4, a donut-shaped magnet holder 22 having a through hole 21 inserted into the rotating shaft 18 is attached to the rotating body 16. The magnet holder 22 is integrally formed of a synthetic resin such as polyacetal nylon resin, and is attached to the projection 24 on the rotating plate 20 so that the positioning hole 26 fits and rotates integrally. The magnet holder 22 has an opening 28 on the back side.
Holes 30 having three holes are formed, and the bottom surface of the hole 30 reaches near the surface of the magnet holder 22, and an opening 34 is formed on this surface while the peripheral edge 32 is left. ing.

In the three holes 30 of the magnet holder 22,
Each is closely fitted so that the permanent magnet 36 does not fall off,
A doughnut-shaped auxiliary magnetic plate 38 attracted to the permanent magnet 36 is attached to the back side of the magnet holder 22. The permanent magnet 36 is made of rare earth such as samarium cobalt having a high magnetic flux density. The auxiliary magnetic plate 38 is fitted into the mounting recess 39 on the back side of the magnet holder 22 and is directly in contact with and attracted to the permanent magnet 36. A through hole 40 is also formed in the auxiliary magnetic plate 38. And is fitted to the projection 24 of the rotating plate 20. The inner peripheral edge and the outer peripheral edge on the surface side of the magnet holder 22 are respectively provided with ridges 42, 44 having a fixed height.
Are formed over the entire circumference.

A magnetic plate 48 fixed to a side wall 46 integral with the chassis 10 is provided above the magnet holder 22. The magnetic plate 48 is, as shown in FIG.
8 is formed at the center, through which the through hole 50 is inserted.
A rectangular through-hole 52 corresponding to the position of the permanent magnet 36 and a magnetic part 54 between the through-holes 52 are formed at equal intervals around the perimeter. The convex portions 42 and 44 of the magnet holder 22 on the rotating body 16 are in sliding contact with the magnetic plate 48, and the magnet holder 22
The distance between the permanent magnet 36 and the magnetic plate 48 is precisely kept constant.

The rotary electric component of this embodiment is a
Each slider 14 is in sliding contact with the conductor pattern formed thereon,
The ON / OFF state of a terminal (not shown) protruding from the substrate 12 changes according to the rotation angle, and the operation of a VTR or the like is controlled by rotating the rotating body 16.

When the rotating body 16 is rotated, the magnet 36 is attracted by the magnetic force to the position below the magnetic portion 54 so as to avoid the through hole 52 of the magnetic body plate 48 and clicks when the rotating body 16 rotates. A feeling is given. Therefore, in this embodiment, since there are ten through holes 52 and the magnetic part 54, ten click positions can be obtained in one rotation, and ten operation modes can be set.

In the rotary electric component of this embodiment, the permanent magnet 36 is fitted into the hole 30 of the magnet holder 22 to complete the mounting of the permanent magnet 36, thereby greatly reducing the man-hour for mounting the permanent magnet 36. Can be reduced. Moreover, the ridges 42 and 44 of the magnet holder 22 allow the gap between the permanent magnet 36 and the magnetic body plate 48 to be accurately and constantly maintained at a small interval, and a stable click feeling can be obtained. is there. Further, since the auxiliary magnetic body plate 38 is attached in direct contact with the permanent magnet 36, the permanent magnet 36
Can be effectively used with a small loss. Further, the attachment and detachment of the permanent magnet 36 is easy, and the permanent magnet 36 can be easily exchanged and used depending on the model.

In the rotary electric component of the present invention,
At the time of molding the magnet holder, the permanent magnet may be attached to a predetermined position by insert molding. As a result, the operation of attaching the permanent magnet is made more efficient. In addition, the positioning of the permanent magnet is accurately performed, and the distance between the permanent magnet and the magnetic plate can be more accurately maintained. Further, the permanent magnet and the auxiliary magnetic body plate may be formed integrally with the magnet holder by insert molding.

[0019]

[Effect of the Invention] The rotary electric component of the present invention can easily mount the permanent magnet simply by mounting the permanent magnet in the hole of the magnet holding body. The distance from the body plate can be accurately kept constant, and a stable click feeling can be obtained. Also,
The replacement of the permanent magnet is also easily possible.

Further, by mounting the permanent magnet in the magnet holder by insert molding, the man-hour for mounting the magnet can be further reduced, and the position of the magnet can be more accurately determined. Further, since the magnet is not embedded in the magnet holding body by the insert, the magnet does not come off, and the magnet can be easily handled with high strength.

Further, since the auxiliary magnetic plate is directly attracted to the permanent magnet, the magnetic force of the permanent magnet can be used without waste, and a strong click feeling can be obtained effectively.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a rotary electric component according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the rotary electric component of the embodiment.

FIG. 3 is a bottom view of the magnet holder of the rotary electric component of this embodiment.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a plan view showing a magnetic plate of this embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Chassis 12 Substrate 16 Rotating body 18 Rotating axis 22 Magnet holder 30 Hole 36 Permanent magnet 38 Auxiliary magnetic body plate 42,44 Convex stripe

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G11B 15/10 H01H 19/20

Claims (3)

(57) [Claims] 1. A permanent magnet is provided around a rotation axis, and a magnetic plate having magnetic portions formed at a predetermined pitch is provided facing the permanent magnet, and one of the magnet or the magnetic plate is provided. In a rotary electric component fixed to the rotating shaft and provided on a rotating body that rotates the other around the rotating shaft,
A resin magnet holder having a hole for accommodating the permanent magnet is provided, and the hole is opened on the opposite side to the magnetic plate, and the bottom of the hole reaches near the magnetic plate side. A convex portion which is formed in a shape, and makes the distance between the magnetic plate and the permanent magnet housed in the hole portion in contact with the surface of the magnetic plate is formed integrally with the magnet holder. Rotating electrical components. 2. A permanent magnet is provided around a rotation axis, a magnetic plate having magnetic portions formed at a predetermined pitch is provided facing the permanent magnet, and one of the magnet or the magnetic plate is provided. In a rotary electric component fixed to the rotating shaft and provided on a rotating body that rotates the other around the rotating shaft,
The permanent magnet is provided in a resin-made magnet holder by insert molding, and one end of the permanent magnet is located near the magnetic plate side in the magnet holder and provided so as to face the magnetic plate. A convex portion that abuts on the surface of the magnetic plate and that keeps the distance between the permanent magnet and the magnetic plate in the magnet holder housed in the hole part constant is formed integrally with the magnet holder. Rotating electrical components. 3. The rotary electric component according to claim 1, wherein an auxiliary magnetic plate directly contacting the permanent magnet is provided on a side of the opening of the hole of the magnet holder.