JPH0638364B2 - Rotatable electrical parts - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a movable contact in a rotary operation type small variable resistor, switch or the like having a plurality of contact mechanisms, which is used in small audio equipment, video equipment and the like. The present invention relates to a rotary operation type electric component having a rotating body having a movable contact in a rotating body having a rotating body.

2. Description of the Related Art As a general structure of a rotary operation type electric component having a plurality of contact mechanisms, two sets of fixed contact substrates of contact mechanisms are arranged so as to face each other, and the front and rear surfaces of a rotating body disposed between them are respectively arranged. The method of attaching an elastic movable contact corresponding to the fixed contact is used.

As a specific example, a rotary operation type double variable resistor is
Shown in Figures and 11. In the figure, reference numerals 1 and 2 denote substrates made of an insulating material, and the horseshoe-shaped resistance element layers 3 and 4 and the conductive layers 5 and 6 serving as fixed contacts are provided on the opposing surfaces.
Is formed on the concentric axis by printing or the like, and external connection terminals 7, 7 ', 8, 8'and 9, 10 derived from the resistive element layer end portion and the conductive layer are attached. A rotating body 11 made of an insulating material is disposed on the concentric axis between the two substrates 1 and 2, and elastic contact bodies 12 and 13 are attached to the front and rear surfaces of the rotating body 11 by fitting or the like. These elastic contact bodies 12 and 13 are electrically independent from each other, and each has a plurality of elastic legs and tip sliding contacts 12 ', 12 "and 13', 13". Of the sliding contacts, 12 ′ and 12 ″ are on the resistive element layer 3 and the conductive layer 5 on the substrate 1, and the sliding contacts 1
3 ′ and 13 ″ are in elastic contact with the resistive element layer 4 and the conductive layer 6 on the substrate 2, and when the rotating body 11 is rotated via the rotary operation shaft 14, the rotary element 11 is rotated and slid on the respective circular layers. Between terminals 7 and 9 (or between 7'and 9 ') and terminal 8,
The resistance value between 10 (or between 8'and 10) is changed.

Problems to be Solved by the Invention In the structure of the rotary operation type double variable resistor as described above, as shown in FIG. 12, two elastic contact bodies 12 and 13 are separately provided on the front and rear surfaces of the rotary body 11. The rotating body 1 is attached between the two elastic contact bodies 12 and 13 which are attached by a nipple or the like.
Therefore, it is necessary to increase the dimension between the contacts, that is, the distance between the front and rear substrates 1 and 2, which is a disadvantageous factor for downsizing the electric component.

In addition, in the stereo interlocking variable resistor, if there is a difference (deviation) in the change in the resistance value of the front and rear resistance board parts, it will appear as a difference in sound volume, but if it is the structure of the above contact part The elastic contact bodies 12, 13 attached to the front and rear surfaces of the rotating body 11 are likely to be misaligned at the time of fitting, causing looseness and looseness in attachment, which causes a difference in resistance value change. There is also a problem that (mutual deviation) occurs.

The present invention is intended to solve the problems of the conventional rotary body with a movable contact as described above, and an object thereof is to provide a rotary operation type electric component with stable quality.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention positions the base portions of the two sets of movable contact bodies on substantially the same plane, insert-molds them into the insulating resin of the rotating body, and embeds and fixes them. The elastic leg of the movable contact body is bent and the tip contact portion is projected in the front-rear direction to provide a rotating body having two electrically independent movable contact groups.

With the above-mentioned structure, the present invention is intended to insert-mold the elastic contact body as an attachment of the elastic contact body to the insulating resin rotating body, instead of the conventional method of mounting the elastic contact body. Therefore, the mounting is strong and highly accurate, and the function of the rotary operation type electric component using this rotating body can be made more reliable.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1A and 1B are a plan view and a side view of a rotary body 19 with elastic contacts according to an embodiment of the present invention, in which 20 is a molded resin rotary body, and 21 and 31 are elastic metals. A front elastic contact body and a rear elastic contact body made of thin plates. The elastic contact bodies 21 and 31 are electrically independent from each other, and are respectively embedded in the molded resin rotary body 20 and the base portions 22 and 32 and the plurality of elastic leg portions 23, 33, (23 '). , 23 ') and sliding contacts 24, 34, (24', 34 ') at the tips.

FIGS. 2 to 6 show a method of forming the rotary body 19 with elastic contacts, and as shown in FIGS. 2A and 2B, the outer shape of the elastic metal thin plate is punched out according to the shapes of the elastic contact bodies 21 and 31. And sliding contact points 24, 34, (24 ', 34') with protruding dowels, two sheets 21 ', 31' for contact points 24, 34, (24 ', 34') as shown in FIG. Combine so that the protrusion of the dowel is on the outside. The arrangement position at this time is adjusted to the position where the two elastic contact body punching plates 21 'and 31' are mounted on the molded resin rotary body 20, but the contact points before and after being assembled in the electronic component are set. In order to align the position, the elastic legs 23, 33, (23 ', 3
3 ') bending allowance and contacts 24, 34, (24', 3
4 ') The elastic legs 23, 33, (23', 3) of the two elastic contact body punching plates 21 ', 31' corresponding to the size of the dowel.
3 ') and contacts 24, 34, (24', 3
Dowels for 4 ') will overlap.

Then, the two elastic contact member punched plates 2 which are combined with each other
By positioning 1'and 31 'in the molding die 40 as shown in FIG. 4 and injecting resin into the die 40 to form the molded resin rotating body 20 as shown in FIG. These two elastic contact member punching plates 21 'and 31' have base portions 22 and 32 as shown in FIG.
It is encapsulated and fixed in the molding resin.

Further, in order to accurately position the elastic contact body punching plates 21 'and 31' at this time, in order to make the positioning accurate,
As shown in FIGS. A and B, the fixing outer frame portions 26 and 36 are left, and the connecting portions 27 and 37 are cut and separated after being fixed to the molded resin rotating body 20 by molding.

Further, the base portion 2 of the elastic contact body punching plates 21 ', 31'
2, 32 are arranged on the same plane, and the elastic legs 2
3, 33, (23 ', 33') and the tip contact portion 24,
As shown in FIG. 5, consideration is given to the molding die 40 so that the molding resin does not flow into the portions 34, (24 ', 34'). At this time, FIG. 5 shows a cross section of the tip contact portion.

Thereafter, as shown in FIG. 6, the leg portions 23, 33, (23 ', 33') of the elastic contact body punching plates 21 ', 31' which have come out from the molding resin of the molded resin rotary body 20 have their root portions 28. , 3
8, (28 ', 38') are respectively bent in the front-back direction, and the tip contact portions 24, 34, (24 ',
34 ') is made to protrude, so that the rotary member with elastic contact 19
Is completed in the form shown in FIG.

Further, as shown in FIG. 8, the elastic contact member punching plate 21 ',
By forming the fixing outer frame portions 26 and 36 of 31 ′ into a continuous strip shape, it is possible to apply the molding resin rotating body 20 to continuous molding and automatic assembly of electric parts.

FIG. 9 shows a rotary operation type double variable resistor using the rotary body 19 with the elastic contact body of the present invention.

Compared with the conventional example shown in FIGS. 10 to 12, the molded resin rotary body 20 is 11, and the elastic contact bodies 21, 31 are 12, 13.
The sliding contacts 24, 34 are 12 ', 12 ", 24', 3
Substrate 41, 4 with component element 4'in 13 ', 13 "
2 corresponds to 1 and 2 and the rotary operation shaft 43 corresponds to 14, respectively, and the operation thereof is the same, so detailed description thereof will be omitted.

EFFECTS OF THE INVENTION As described above, in the case of the present invention, two movable elastic contact bodies are insert-molded and embedded and fixed in the molding resin of the rotating body. Positioning during molding can be accurately regulated.

Further, as shown in the embodiment, since the base portions of the two elastic contact bodies can be set on the same plane, the thickness of the rotating body sandwiched between them becomes zero, so that the front and rear of the two elastic contact bodies are Since it is possible to reduce the distance between the contact surfaces, that is, the size between the fixed contact substrates before and after the double variable resistor, it is advantageous for downsizing the electric component.

Also, the base parts of the two elastic contact parts of the same kind are positioned on substantially the same plane as described above by overlapping a part of the elastic leg part and the tip contact part so that the contact contact surfaces are on the outside. Then, insert molding was performed on the molded resin rotating body, and the contact portions of the two elastic contact bodies were allowed to slide and contact at the same position on two fixed contact substrates of the same type facing each other. Therefore, the mutual deviation of resistance values can be made extremely small.

As described above, the present invention has a very high practical value.

[Brief description of drawings]

FIG. 1A is a plan view of a rotary body with a movable contact in one embodiment of a rotary operation type electric component of the present invention, FIG. 1B is a side view, and FIGS. 2A and 2B to 6 are rotations with a movable contact. FIG. 7A and FIG. 7B are explanatory views showing a procedure for forming a body, FIG. 7A and FIG. 7B are explanatory views of an elastic contact member punching plate of another embodiment of the present invention, and FIG. FIG. 9 is a side sectional view showing an embodiment of the rotary operation type electric component of the present invention, FIG. 10 is a side cross sectional view of a conventional rotary operation type electric component, and FIG. 11 is the same resistance substrate. A plan view and FIG. 12 are exploded perspective views of the rotary body with a movable contact. 19 ... Rotating body with elastic contacts, 20 ... Molded resin rotating body, 21, 31 ... Elastic contact bodies, 21 ', 31' ... Elastic contact body punching plate, 22, 32 ... Base portion, 23, Two
3 ', 33, 33' ... elastic legs, 24, 24 ', 3
4, 34 '... sliding contact, 26, 36 ... fixing outer frame portion, 27, 37 ... connecting portion, 28, 28', 38, 3
8 '... Root portion, 40 ... Molding die, 41, 42 ... Substrate, 43 ... Rotating operation shaft.

Claims (2)

[Claims] 1. A base portion of two elastic contact portions of the same kind is positioned on substantially the same plane by overlapping a part of the elastic leg portion and the tip contact portion so that the contact contact surfaces are on the outside. Then, it is embedded and fixed in a molded resin rotary body by insert molding, and the elastic leg roots are bent forward and backward respectively to form a rotary body formed by connecting the contact portions of the two elastic contact bodies to each other. Characterized by being rotatably arranged between two facing fixed contact substrates of the same kind so that sliding contact can be made at the same position on the front and rear rotation surfaces (position on a straight line parallel to the rotation axis). Rotating operation type electric parts. 2. An outer frame part for holding a base part of an elastic contact body is integrally formed by a thin metal plate, and the base part is embedded and fixed in a molded resin rotor by insert molding, and the outer frame part is cut. Claim 1 characterized in that it is formed by
The rotary operation type electric component as described in the item.