JPH0373125B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a finely adjustable variable resistor for voltage setting used in music selection circuits for color televisions, videos, etc.

(Structure of conventional example and its problems) The conventional example will be explained with reference to drawings. first,
In FIGS. 1a and 1b, 1 is a substrate made of an insulating material having a hole 1a, and a resistor 1b is provided around the hole 1a, and both ends of this resistor are connected to silver electrodes 1c.
The terminal 2 is pulled out to the outside by the terminal 2. Reference numeral 3 denotes a middle terminal having a structure as shown in FIG. The middle terminal 3 has an eyelet part 3a that is partially inserted into the hole 1a of the board 1, and has a convex part 3b at one end that is inserted and positioned into the hole 1d of the board 1.
The other end is a terminal 3c that is drawn out to the outside, and is attached to the bottom surface of the substrate 1 so that the eyelet portion 3a and the convex portion 3b of the inner terminal 3 fit into the holes 1a and 1d of the substrate 1.

Reference numeral 4 denotes a seat plate made of an insulating material as shown in FIG. 3 and having a hole 4a in the center, which is located on the substrate 1, and is attached so that the hole 4a in the center is inserted into the eyelet 3a of the inner terminal 3.

As shown in FIG. 4, 5 is a slider made of a spring metal material and has a contact 5a on the periphery that slides on the resistor 1b, and has a hole 5b in the center through which the eyelet 3a of the inner terminal 3 is inserted. Furthermore, on the opposite side from the contact point 5a, there is a convex portion 5c that engages with a groove of a knob to be described later. Further, the slider 5 is rotatably attached to the substrate via the seat plate 4 by caulking the eyelet portion 3a of the middle terminal 3.

As shown in FIG. 5, 6 has a lower protrusion 6a inserted into the inner diameter of the eyelet of the middle terminal 3, and has a recess 6c on the bottom in which the protrusion 5c of the slider 5 engages, and the periphery of the body. The knob is provided with a gear portion 6b that meshes with a worm portion of a gear, which will be described later, and rotates together with the slider 5.

As shown in FIG. 6, 7 is a cover made of an insulating material that is attached to the substrate 1, and a hole 7a is provided at a position corresponding to the hole 1a of the substrate 1, into which the small diameter portion of the upper part of the knob 6 fits. It has a hole. or,
A rectangular long window 7 from which a gear operation part, which will be described later, protrudes
b are provided at regular intervals. Holes 7c and 7d are provided in the cover side wall and the inner wall, into which mounting rods for mounting gears, which will be described later, are inserted.

Reference numeral 8 denotes a gear made of an insulating material, which is attached so that an operation part 8a provided with serrations protrudes from the cover 7, as shown in FIG.
It has a worm part 8b that engages with the knob 6b to slow down the rotation, and has a hole 8c in the radial direction. Further, the positioning of the gear 8 is determined by holes 7c and 7d in the side wall and inner wall of the cover 7.

Further, the gear 8 is attached to the inside of the side wall and inner wall of the cover 7 without any play in order to reduce the rotation angle of the operating section 8a at which the output voltage does not fluctuate when the operating section 8a is reversed.

As shown in FIG. 8, 9 is a gear mounting rod made of a metal material, which positions the gear 8 inside the cover 7, rotates with the gear, and is rotatably attached. Further, a cross groove 9b is provided at the tip 9a of the mounting rod, and the structure allows automatic adjustment from the side. Furthermore, a convex portion 9c is provided in the center to be press-fitted into the hole 8c of the gear 8, so that the convex portion 9c can rotate together with the gear 8.

The variable resistor having the above structure is such that by rotating the gear 8, the knob 6 and the slider 5 are rotated at a reduced speed, and an arbitrary resistance value can be obtained.

By the way, in the fine adjustment type variable resistor with this structure, when an impact is applied to the side surface of the cover 7 from direction A as shown in Fig. 9, since the gear 8 is in close contact with the inner wall of the cover 7, it will not move in the same direction as the impact. occurs in gear 8.
Then, the rotation of the knob 6 corresponding to the movement of the gear 8 occurs in the B direction, and at the same time the slider 5 rotates, causing the output voltage to fluctuate. As described above, the finely adjustable variable resistor having this structure has a problem in that the output voltage tends to fluctuate when a direct impact is applied to the cover.

(Object of the invention) This invention eliminates the conventional drawbacks as mentioned above,
The purpose of the present invention is to provide a finely adjustable variable resistor with improved reliability.

(Structure of the Invention) The present invention includes a resistor having an arcuate pattern formed on a substrate made of an insulating material, and a resistor made of a springy metal material and rotatably mounted on the substrate coaxially with the pattern of the resistor. a slider that slides into contact with the resistor, a knob that has a gear part on the body that is rotatably attached coaxially with the pattern of the resistor, and an engaging part that engages with the slider on the bottom; A gear that has a worm part that meshes with the gear part of the knob, and has an operating part with a larger diameter than the worm part at one end of the worm part, and a mounting part with the same larger diameter at the other end, and the operating part and attachment of this gear. A mounting base that holds the gear so that the side wall is in contact with the end face of each worm part of the part with appropriate pressure, and a mounting base that is arranged with an appropriate space from the end face of the gear and a part of the operating part protrudes to the outside. It consists of a cover with a long window.

According to this configuration, since the gear is not in close contact with the inner surface of the cover, even if an impact is applied to the cover, the impact will not be directly transmitted to the gear, and therefore the resistance setting value will be significantly deviated. This improves reliability.

(Explanation of Examples) Examples will be described with reference to the drawings.

Reference numeral 10 denotes a mounting base made of an insulating material and having a shape as shown in FIG. It also has a groove 10b at a constant distance from the hole 10a, into which a worm portion of a gear to be described later is inserted. At that time, the fitted state of the gear worm part and the knob gear part is determined by the dimension between the hole 10a and the groove part 10b. Next, the gear is attached to the side wall 10c of the mounting base 10 so that the operating section of the gear (described later) and the end surface of each worm section side of the mounting section are in contact with each other with appropriate pressure.

As shown in FIG. 11, reference numeral 11 is a gear made of an insulating material that is attached so that an operation part 11a provided with serrations protrudes from a cover (to be described later), and a worm part that meshes with a gear part 6b of the knob 6 to slow down the rotation. 11b, and further includes an operation section 11a.
The opposite end has a mounting portion 11c that engages with the side wall 10c of the mounting base 10. In addition, the operation section 11a
The dimension between and the mounting part 11c is the side wall 1 of the mounting base 10.
The width is made slightly smaller than the width between 0c and press-fitted,
The rotation angle of the operating section 11a at which the output voltage does not change when the operating section 11a is reversed is regulated, and rotational torque during operation is further generated. In addition, the operation section 11
A and the mounting portion 11c are provided with cross grooves 11d, and have a structure that can be automatically adjusted from the side.

12 is a cover made of an insulating material that is attached to the board 1 as shown in FIG. 12, and a hole 12a is provided at a position corresponding to the hole 1a of the board 1, and the small diameter part of the upper part of the knob 6 fits into the hole. have.
In addition, there is a rectangular long window 1 from which the operating part of the gear 11 protrudes.
2b are provided at regular intervals. Further, a hole 12c into which an automatic adjustment screwdriver is inserted is provided in the side wall of the cover.

Incidentally, the mounting rod 9 used in the conventional example does not exist in this embodiment because the gear position is determined by the mounting base 10.

Although each component used in the embodiment of the present invention has been described above, the configuration of the other components is the same as that of the conventional example.

FIG. 13 shows the configuration of an embodiment made up of the parts described above, and is set so that a space is provided between the side wall of the cover 12 and the gear 11.

(Effects of the Invention) Since the finely adjustable variable resistor of the present invention configured as described above has a space between the gear and the cover side wall, even if an impact is applied from the cover side wall, it will not be transmitted to the gear. The impact is small, gear movement is small, and as a result, fluctuations in output voltage are small, and the gear operating section has an appropriate torque, providing users with a highly reliable product with excellent operability. be able to.

[Brief explanation of drawings]

Fig. 1 is a sectional view a of a conventional main part and a partially cutaway plan view b, Fig. 2 is a perspective view of the middle terminal, Fig. 3 is a perspective view of the seat plate, and Fig. 4 is a perspective view of the slider. , FIG. 5 is a front view a and a plan view b of the knob, FIG. 6 is a sectional view of the cover, and FIG. 7 is a front view a and a side view b of the gear.
Fig. 8 is a front view a and a side view b of the mounting rod, Fig. 9 is a partially cutaway plan view of a conventional method, Fig. 10 is a front view a and a plan view b of the mounting base of the present invention, and Fig. 11 is a A front view a and a side view b of the gear of the present invention, FIG. 12 is a cross-sectional view of a cover according to an embodiment of the present invention, and FIG. 13 is a partially cutaway plan view a and a cross-sectional view b of the embodiment of the present invention. 1... Board, 2... Terminal, 3... Middle terminal, 4...
... Seat plate, 5 ... Slider, 6 ... Knob, 7 ... Cover, 8 ... Gear, 9 ... Mounting rod, 10 ... Mounting base, 11 ... Gear according to the present invention, 12 ... Book Cover by invention.

Claims (1)

[Claims] 1 A resistor having an arcuate pattern formed on a substrate made of an insulating material, and a resistor made of a springy metal material rotatably attached to the substrate coaxially with the pattern of the resistor. a slider in contact with the slider; a knob having a gear portion on the body that is rotatably attached coaxially with the pattern of the resistor and having an engaging portion on the bottom that engages with the slider; A gear that has a worm part that meshes with a gear part, and has an operating part having a larger diameter than the worm part at one end of the worm part, and a mounting part also having a larger diameter at the other end, and the operating part and the mounting part of the gear. a mounting base that holds the gear so that the side wall is in contact with the end face of each worm part with an appropriate pressure, and a mounting base that is arranged with an appropriate space from the end face of the gear and that a part of the operating part is external. A finely adjustable variable resistor comprising: a cover having a long window protruding from the cover;