JPH0129862Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tuning mechanism for an electronic tuner, such as a television receiver, that utilizes a compact and simple-structured multi-row variable resistor.

As an electronic tuner that uses a multi-row type band switch and a finely adjustable variable resistor unit,
Utility Application No. 53-152118 filed by the applicant
A push-button type was devised, such as No. 68307), which was quite small and easy to adjust, and has been widely used, but it has the disadvantage of a complicated structure and high cost. Conventional multi-row variable resistors for electronic tuners use lead screw adjustable variable resistors as variable resistor units with preset fine adjustment for each channel selection, so each variable resistor unit is relatively complex. The lead screw, its fixing device, and drive device are included, so the number of parts, the number of man-hours for processing the parts, and the number of assembly man-hours are large, and the processing of the parts also requires high precision, resulting in high costs.

By adjusting the individual rotary variable resistors of the variable resistor block with multi-row band switch used in the electronic tuner using a common knob with a deceleration rotation mechanism that is not integrated with this block, each variable Application No. 56-152260 and Utility Application filed by the present applicant as a tuning component for an electronic tuner that includes a multi-row variable resistor that enables fine adjustment of the resistor and achieves miniaturization and cost reduction as a whole. There is an idea in No. 152261 (1981).

The present invention is an improvement on the above-mentioned invention, and specifically provides a tuning component for an electronic tuner that includes a multi-row variable resistor that facilitates band switch switching and further reduces overall size and cost. The purpose is to

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

The drawings show an embodiment of the present invention, and FIG. 1A is a top view of the tuner unit, FIG. 1B is a side view thereof, C is a front view thereof, and FIG. 1D is a back view thereof. FIG. 2A is a top view of the variable resistor adjustment knob with a deceleration rotation mechanism, FIG. 2B is a side view thereof, and FIG. 2C is a back view thereof. 3A is an enlarged top view of the tuner unit board, B is an enlarged side sectional view of the tuner unit, and C is a front sectional view of the band switch section, respectively, taken along the line B--B in FIG. 1A.
B, CC section is shown enlarged. 4A is a top view of the variable resistor rotor, FIG. 4B is a side view of the variable resistor rotor with a sectional view taken along line B'-B' on the right side, and FIG. 4C is a back view of the variable resistor rotor. Figure 5A
B is a top view of the resistor slider, and B is a side view of the same.
FIG. 6A is a top view of the center terminal, FIG. 6B is a side view of the same, and FIG. 6C is a front view. 7A is a top view of the band switch knob, FIG. 7B is a partially cutaway side view of the same, and FIG. 7C is a bottom view. 8A is a top view of the band switch slider, FIG. 8B is a side view of the same, and FIG. 8C is a developed view. 9A is a top view of the band switch terminal, FIG. 9B is a side view thereof, and FIG. 9C is a rear view thereof.

In FIGS. 1 to 3, reference numeral 1 indicates a rectangular dish-shaped case made of an insulating resin mold, and reference numeral 2 indicates a rectangular insulating substrate having a resistor 21 and a switch circuit provided on its inner surface, which is fixed to the opening of the case. In the space between the case 1 and the board 2, there is a rotor 4 of a variable resistor made of an insulated resin mold to which a resistor slider 5 that slides on the resistor 21 of the board 2 is fixed, and a switch circuit on the board 2. A band switch knob 7 made of an insulating resin mold is attached to which a band switch slider 8 that engages to perform a switching action is fixed.

On the upper surface of the rectangular substrate 2, a third
As shown in FIG. A, a plurality of ring-shaped resistors 21 are formed in parallel along the lower side edge of the substrate using carbon resin paint or the like using a well-known printing technique. The lower end electrode 23 of each ring-shaped resistor 21 is connected to an external terminal 23A made of a fixed metal plate via a terminal hole 23B. The electrode portions 22C at the other end of each ring-shaped resistor 21 are connected to each other and guided to the common electrode 22, and are connected to the fixed external common terminal 22A through the terminal hole 22B at the left end, as described above.

A center hole 2C is provided at the center of each ring-shaped resistor 21, into which an eyelet 6C of a center terminal 6, which will be described later, is inserted. Parallel to the ring-shaped resistors 21 arranged in the longitudinal direction of the substrate 2, along the upper edge thereof, corresponding to each of the ring-shaped resistors 21, L, L,
Band switch electrodes 25C, 26C, and 27C for selecting H and UHF bands are provided, and common electric lines 25 and 2 are connected to the respective band switch electrodes.
6, 27 to the respective common terminals 25B, 26B,
External terminals 25A, 26A, 27A via 27B
is connected to.

Slider 5 shown in FIG. 5 sliding on resistor 21
In accordance with the conventional technique, the eyelet 6C of the center terminal 6 shown in FIG. 6, which is inserted into the board from the outside of the lower surface of the board 2 through the hole 2C in the board, is inserted into the center hole 5C, and the eyelet 6C of the center terminal 6 shown in FIG. It is rotatably caulked to the part.

The rotor 4 of the variable resistor shown in FIG. 4 is inserted into the center hole of the eyelet 6C of the central terminal 6 of the lower shaft 4C, and the notch 5D of the slider 5 is engaged with the projection 4D on the lower surface. The locking portion 4'C on the end face of the knob shaft 4C is press-fitted into the center hole 2C of the base plate 2 so as to be rotatable. Further, in the center of the upper surface of the rotor 4, there is provided an internal gear-shaped engagement recess 4B in which the outer periphery of a variable resistor adjustment knob 3 to be described later engages with a gear-shaped rotor driver 3B, and the adjustment knob 3 is rotated. This allows the variable resistor to be adjusted. Further, a rotation angle display section 4A is provided on the upper surface of the rotor.

The variable resistor adjustment knob 3 shown in FIG. 2 has a knob rotation part 3A at the top, a knob main body 3D at the center, and an internal gear hole-shaped hole provided around the variable resistor adjustment hole 1B of the case 1 at the bottom. An external gear-shaped case engagement part 3C integral with the knob body 3D that engages with the knob engagement part 1C so as not to rotate, and a rotor drive element 3B in the form of an external gear with a small diameter below the case engagement part 3C.
It is equipped with Here, the adjustment knob 3 has a structure in which when the knob rotating part 3A is rotated with the knob main body 3D fixed, the rotor driver 3B rotates at a speed of about 1/20 of the rotation of the knob rotating part 3A. It is becoming. Further, at the upper end of the knob rotating part 3A, integrally with the knob rotating part 3A, there is a hexagonal columnar band switch knob engaging part 3E that engages with a band switch knob engaging hexagonal hole 7A of the band switch knob 7, which will be described later. It is provided.

The band switch slider 8 made of an elastic metal plate shown in FIG.
It is inserted into the fixing protrusions 7C and 7D at the bottom of the band switch knob 7 shown in FIG. 7, and is fixed by caulking. The upper part of the cylindrical band switch knob 7 shown in FIG.
Hexagonal columnar protrusion 3 at the upper end of the knob rotation part 3A
A band switch knob engaging hexagonal hole 7A that engages with E to switch the band switch, and a display section 7B such as a notch indicating the band switching position are provided. The band changeover switch terminal 9 made of a metal plate shown in FIG.
An electrode part 9B that presses into contact with B, a positioning protrusion 9E that engages with the positioning recess 1E of the case 1, an external terminal part 9A, and a positioning shoulder part 9F are provided.

As shown in FIGS. 1 and 3B and C, the inner upper surface of the rectangular dish-shaped case 1 is provided with an engaging round hole 1A that engages with a plurality of band switch knobs 7,
A band switch knob 7 is provided below the round hole 1A to regulate the switching angle of the band switch knob 7.
Rotation angle regulating cutout recess 1 that engages with side protrusion 7E of
D and band switch terminal 9 positioning protrusion 9
An engagement hole 1E that engages with E and a positioning recess 1F that engages with shoulder 9F are provided. Further, on the upper surface of the case 1, there is an external gear-shaped engagement at the lower part of the knob main body 3D of the variable resistor adjustment knob 3 corresponding to the center of the rotor 4 of the variable resistor rotatably mounted on the base plate 2. An internal gear hole-shaped knob engaging part 1 is provided around the variable resistor adjustment part 3C that engages with the variable resistor adjustment part 1B.
C is provided. The knob engaging portion 1C may be any suitable engaging portion that engages with the case engaging portion 3C to prevent the knob body 3D from rotating, and may be a non-circular hole, a recess, or the like. Further, around the lower surface of the case 1, a case protrusion 1H that engages with the positioning hole 2H of the substrate 2 is provided for positioning and for mutual fixation by caulking a part of the case protrusion 1H. Case protrusion 1
H also plays the role of a spacer between the printed circuit boards in the set.

As described above, the assembly of the present invention involves connecting the external terminals 22A, 23A, 25A, 26 to each end electrode of the substrate 2.
A, 27A to the respective terminal holes 22B, 23B,
25B, 26B, and 27B, and the resistor slider 5 and rotor 4 are rotatably attached to the board 2 via the center terminal 6, and a switch terminal is attached to the inner surface of the dish-shaped case 1. 9 positioning protrusion 9E and shoulder portion 9F into engagement hole 1E and engagement recess 1
After inserting and positioning the band switch slider 8 into the upper cylindrical part 7'A of the band switch knob 7, insert it into the engagement hole 1A of the case 1.
Insert it into the side protrusion 7 of the band switch knob 7.
E is the rotation angle regulating notch recess 1D of the case engagement hole 1A.
Insert the protrusion 1H of the case 1 into the engagement part 2H of the board 2, and swage some or all of the case protrusions 1H to fix them together to complete the assembly. do.

Adjustment of the variable resistor in the present invention is carried out by inserting an external gear into the lower end of the knob body 3D of the variable resistor adjustment knob 3 that engages with the internal gear-shaped engagement hole 1C on the top surface of the dish-shaped case 1 from above. Insert the gear-shaped engagement parts 3C and attach them so that they do not rotate with each other, and then push the knob 3 further to engage the rotor driver 3B at the lowest end of the knob 3 with the rotor 4 of the variable resistor. When the concave portions 4B are engaged with each other in the rotational direction and the rotating portion 3A on the upper part of the knob 3 is turned while pressing it toward the case 1, the variable resistor is decelerated and finely rotated through the rotor driver 3B to accurately adjust the rotation. Can be adjusted. Similarly, one attached knob 3
Multiple variable resistors can be easily adjusted using the . In addition, to adjust the switching of the band switch, turn the knob 3 that finely adjusts the variable resistor upside down, and connect the upper end engaging part 3E of the knob rotating part 3A.
into the hexagonal hole 7A at the upper end of the band switch knob 7, and adjust by rotating the knob rotating part 3A. The hexagonal hole 7A of the band switch knob 7 may be any suitable engagement part for engaging with the engagement part 3E of the knob rotation part 3A of the knob 3 to drive the knob 3 in rotation, and may be a non-circular hole or the like.

In the present invention, an engagement recess 4B having an internal gear is formed on the upper surface of the rotor 4, and a band switch knob engagement hole 7A is formed on the upper surface of the band switch knob 7. The rotary variable resistor and the rotary band switch can be easily adjusted by the rotor driver 3B and the band switch knob engaging portion 3E provided at both ends, respectively. Here, the knob rotation part 3 of the adjustment knob 3
A deceleration rotation mechanism is provided between A and the rotor driver 3B, so that the resistance value of the rotary variable resistor can be easily finely adjusted, but this deceleration rotation mechanism does not necessarily have to be provided.

Further, since the electrode portion 9B of the band changeover switch terminal 9 is formed in a wave shape and the band switch slider 8 is configured to come into sliding contact with this portion, this portion constitutes an articulating cam portion. Therefore, there is no need to newly attach an articulated cam mechanism to this rotary band switch, and the overall configuration can be simplified and downsized.

In addition, since the electronic tuner selection parts including the multi-row variable resistor according to the present invention have a small number of parts and a simple structure, assembly is easy and the overall size and cost can be reduced. .

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1A is a top view of the tuner unit, FIG. 1B is a side view thereof, C is a front view thereof, and FIG. 1D is a back view thereof. FIG. 2A is a top view of the variable resistor adjustment knob with a deceleration rotation mechanism, FIG. 2B is a side view thereof, and FIG. 2C is a back view thereof. 3A is an enlarged top view of the tuner unit board, B is an enlarged side sectional view of the tuner unit, and C is a front sectional view of the band switch section, respectively, taken along the line B--B in FIG. 1A.
B, CC, cross section is shown enlarged. Figure 4 A is a top view of the variable resistor rotor, B is the right side B'-
B' is the same side view with a sectional view, and C is the same back view. FIG. 5A is a top view of the resistor slider, and FIG. 5B is a side view of the same. FIG. 6A is a top view of the center terminal, FIG. 6B is a side view of the same, and FIG. 6C is a front view. 7A is a top view of the band switch knob, FIG. 7B is a partially cutaway side view of the same, and FIG. 7C is a bottom view. FIG. 8A is a top view of the band switch slider, B is a side view of the same, and C
is a developed diagram. 9A is a top view of the band switch terminal, FIG. 9B is a side view thereof, and FIG. 9C is a rear view thereof. 1...Case, 1A...Elongated engagement hole, 1C...Knob engaging portion, 2...Board, 3...Adjustment knob, 3A...Knob rotating portion, 3B...Rotor driver, 3C...Case engaging portion, 3E...Band switch Knob engaging part, 3D
...Knob body, 4...Rotor, 4B...Knob driver engaging recess, 5...Resistor slider, 6...Center terminal,
7...Band switch knob, 7A...Band switch knob engagement hole, 8...Band switch slider, 9
...Switch terminal, 9B... Electrode portion, 21... Variable resistor resistor, 25C, 26C, 27C... Band switch electrode, 25, 26, 27... Band switch common circuit.

Claims (1)

[Claims for Utility Model Registration] A rectangular plate having a plurality of variable resistor resistors 21 of a desired shape along one side edge thereof, and a band of a desired shape along the other side edge thereof. An insulating substrate 2 configured with switch common circuits 25, 26, and 27, a metal resistor slider 5 that slides on the variable resistor resistor 21 of the insulating substrate 2, and the resistor slider. a rotor 4 made of an insulating material arranged on the resistor slider 5 and rotating together with the resistor slider 5; and a rotary variable resistor made of a metal plate placed on the insulating substrate 2 in parallel thereto A band changeover switch terminal 9 having a wavy electrode part 9B arranged so as to have a wavy shape, an electrode part 9B of the band changeover switch terminal 9, and a part of the band switch common electric circuits 25, 26, 27 of the insulating substrate 2. Band switch electrodes 25C, 26C, 27 provided
A band switch slider 8 made of metal that comes into sliding contact with any of C, and a band switch knob 7 made of an insulator that is arranged on the band switch slider 8 and rotates together with the band switch slider 8. and an insulating case 1 that is placed over the rotary variable resistor and the rotary band switch. An engagement recess 4B having an internal gear that engages with a gear-shaped rotor driver 3B provided at one end of the adjustment knob 3 is formed on the upper surface of the band switch knob 7, A band switch knob engaging hole 7A that engages with a non-circular cylindrical band switch knob engaging portion 3E provided at the end is formed, and a band switch knob engaging hole 7A is formed in a portion of the insulating case 1 facing the rotor 4 and the band switch knob 7. A tuning component for an electronic tuner including multi-row variable resistors, each of which has a hole into which the adjustment knob 3 is inserted.