JPH0129863Y2 - - 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
68307), which were quite compact and easy to adjust, and have been widely used, but they have the disadvantage of being complicated in structure and high in 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 a multi-row band switch used in the electronic tuner using the common adjustment knob with a deceleration rotation mechanism that is not integrated with the variable resistor block, Allows fine adjustment of each variable resistor,
As a tuning component for an electronic tuner including a multi-row variable resistor that has been made smaller and cost-reduced as a whole, the present applicant has devised Utility Application No. 1983-152260 and Utility Model Application No. 56-152261. .

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, 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.

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.

In the rotor 4 of the variable resistor shown in FIG. 4, the lower shaft 4C is inserted into the center hole of the eyelet 6C of the central terminal 6, and the notch 5D of the slider 5 is engaged with the projection 4D on the lower surface. The engaging portion 4'C of the end surface 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. Also, the knob rotating part 3A
At the upper end of the knob, integrally with this knob rotation part 3A,
A hexagonal columnar band switch knob engaging portion 3E is provided which engages with a band switch knob engaging hexagonal hole 7A of a band switch knob 7, which will be described later.

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. Here, the electrode portion 9B is formed in a wavy shape, giving the band switch slider 8 a sense of articulation.

As shown in FIGS. 1 and 3B and C, the upper inner surface of the rectangular dish-shaped case 1 is provided with engagement round holes 1A that engage with a plurality of band switch knobs 7. On the lower side, in order to regulate the switching angle of the band switch knob 7, there is a rotation angle regulating notch 1D that engages with the side protrusion 7E of the band switch knob 7.
and positioning protrusion 9E of band switch terminal 9
An engagement hole 1E that engages with the shoulder portion 9F and a positioning recess 1F that engages with the shoulder portion 9F are provided. Further, on the upper surface of the case 1, there is an external gear-like 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. A knob engaging portion 1C of an internal gear hole is provided around the variable resistor adjustment hole 1B that engages with the portion 3C. Note that this knob engaging portion 1C is connected to the case engaging portion 3C so that the knob body 3D does not rotate.
Any suitable engaging portion that engages with the surface may be used, and may be a non-circular hole, a recess, or the like. Further, a case protrusion 1H that engages with a positioning hole 2H of the substrate 2 is provided around the lower surface of the case 1 for positioning and for mutual fixation by caulking a part of the case protrusion 1H. Case protrusion 1H
It also serves as 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 substrate 2 via the center terminal 6, and a switch terminal 9 is attached to the inner surface of the dish-shaped case 1. After inserting and positioning the positioning protrusion 9E and shoulder part 9F into the engagement hole 1E and engagement recess 1F, respectively, insert the upper cylindrical part 7'A of the band switch knob 7 to which the band switch slider 8 is fixed. Engagement hole 1 of case 1
A, and insert the side protrusion 7E of the band switch knob 7 into the rotation angle regulating notch recess 1 of the case engagement hole 1A.
The case assembly 10 engaged with D is assembled by inserting the protrusion 1H of the case 1 into the engagement part 2H of the board 2, and caulking some or all of the plurality of case protrusions 1H to fix each other. Complete.

Adjustment of the variable resistor in the present invention is performed by an external gear provided at 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 from above. Insert the shaped engagement parts 3C and attach them so that they do not rotate with each other, and then push the knob 3 further to move the rotor drive element 3B at the lowermost end of the knob 3 into the engagement recess 4B of the variable resistor rotor 4. When the knobs 3 and 3 are engaged with each other in the rotational direction and the rotating part 3A on the upper part of the knob 3 is turned while pressing it in the direction of the case 1, accurate adjustment is made by decelerating and finely adjusting the variable resistor via the rotor driver 3B. be able to. Similarly, one attached knob 3 can be used to easily adjust each of a plurality of variable resistors. To adjust the switching of the band switch, turn the knob 3 that finely adjusts the variable resistor upside down, insert the upper end engaging part 3E of the knob rotation part 3A into the upper end hexagonal hole 7A of the band switch knob 7, and turn the knob. Adjust by rotating section 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.

As described above, according to the present invention, when the rotor 4 is rotated by the adjustment knob 3, the case engagement part 3C of the adjustment knob 3 is fixed to the knob engagement part 1C of the insulating case 1, so that the adjustment The rotation operation of the knob rotation part 3A of the knob 3 becomes easy.

Further, at this time, since a deceleration rotation mechanism is interposed between the knob rotating section 3A and the rotor driver 3B, fine adjustment of the rotary variable resistor can be easily and reliably performed.

Further, this adjustment knob 3 is provided with not only a rotor driver 3B that rotates the rotor 4 of the rotary variable resistor, but also a band switch knob engaging portion 3E that rotates the band switch knob 7 of the rotary band switch. Therefore, both the rotary variable resistor and the rotary band switch can be easily adjusted.

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, in which 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 line B--B in FIG. 1A.
B, CC are 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 rotor. FIG. 5A is a top view of the resistor slider, and FIG. 5B is a side view of the same. 6th
Figure A is a top view of the center terminal, and Figure B is a side view of the same.
C is a front view. Fig. 7A is a top view of the band switch knob, B is a partially cutaway side view of the same, and C is a side view of the band switch knob.
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. Figure 9A is a top view of the band switch terminal;
B is the same side view, and C is the same back view. 1... Case, 1A... Engagement long groove, 1C... Knob engaging portion, 2... Board, 3... Adjustment knob, 3A... Knob rotating section, 3B... Rotor driver, 3C... Case engaging portion, 3E... Band switch knob Engagement 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 electrical circuit.

Claims (1)

[Claims for Utility Model Registration] A plurality of variable resistor resistors 21 of a desired shape and band switch common electric circuits 25, 26,
27 and an insulating material that rotates integrally with the resistor slider 5 on the metal resistor slider 5 that slides on the variable resistor resistor 21 of the insulated substrate 2. A rotary variable resistor having a structure in which a rotor 4 is attached, a band changeover switch terminal 9 made of a metal plate, and a band switch common electric circuit 25, 2 of the insulating substrate 2.
Band switch electrode 25 provided on a part of 6, 27
It is equipped with a metal band switch slider 8 for switching the connection between c, 26c, and 27c, and is made of an insulator that rotates integrally with the band switch slider 8 on top of the band switch slider 8. A rotary band switch having a structure in which a band switch knob 7 is attached, an insulating case 1 that is placed over the rotary variable resistor and the rotary band switch, a knob body 3D having a substantially columnar shape, and the knob body A case engaging portion 3 is attached to the lower side of the knob body 3D and has a non-circular outer circumference.
C, a knob rotating part 3A rotatably attached to the upper side of the knob body 3D, and a band switch knob having a non-circular outer circumference, which is attached integrally with the knob rotating part 3A at the upper end of the knob rotating part 3A. a rotor drive element 3B which is attached to the lower side of the case engagement part 3C, is rotatably connected to the knob rotation part 3A via a deceleration rotation mechanism, and has a gear formed on its outer periphery. The adjustment knob 3 is provided on the upper surface of the rotor 4.
An engagement recess 4B having an internal gear that engages with the rotor drive element 3B is formed on the upper surface of the band switch knob 7, and a band switch knob engagement part 3E of the adjustment knob 3 is formed on the upper surface of the band switch knob 7.
A band switch knob engaging hole 7A is formed to engage with the case engaging portion 3C of the adjustment knob 3 on the inner peripheral surface of the portion of the insulating case 1 facing the rotor 4. A variable resistor adjustment hole 1B having a knob engaging portion 1C is formed, and an engaging hole 1A for rotatably supporting the band switch knob 7 is formed in a portion of the insulating case 1 facing the band switch knob 7. A tuning component for an electronic tuner including a multi-row variable resistor characterized by forming a multi-row type variable resistor.