JPH0141231Y2 - - 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 small and simple 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.

In addition, 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 Since the lead screw includes a complicated lead screw, its fixing device, and a driving device, the number of parts, the number of man-hours for machining the parts, and the number of man-hours for assembling the parts are large, and the machining of the parts also requires high precision, resulting in high costs.

Here, the individual rotary variable resistors of the multi-row variable resistor block with band switch used in the electronic tuner are adjusted using a common knob with a deceleration rotation mechanism that is not integrated with the variable resistor block, resulting in a smaller overall size. Utility Application No. 57-56187 and No. 57- by the present applicant as a tuning component for an electronic tuner including a multi-row variable resistor that reduces costs.
No. 56188, and its improvement as U.S. Patent No. 58-107653
No. 1 and Utility Application No. 107654/1983 have been developed, but the problem was that they were inconvenient to handle.

The object of the present invention is to make the adjustment of the adjustment knob, which is the adjustment part of a variable resistor with a deceleration rotation mechanism, smooth and with small bumps during adjustment, and in particular, to make adjustment during assembly accurate, easy, and quick. Another object of the present invention is to provide an electronic tuner selection component including a multi-row variable resistor that is compact as a whole, easy to process and assemble, and has excellent performance and reliability.

Embodiments of the present invention will be described 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. 2 is an enlarged top view of the tuner unit including a partially cut-out portion of the case for explanation. 3A is an enlarged top view of the tuner unit board, B is an enlarged side cross-sectional view of the tuner unit, and B-B in FIG. 1A is shown.
The cross section is shown enlarged. Figure 4 shows mold case 1
FIG. 2 is a perspective enlarged explanatory view of a main part of the apparatus as seen from an opening.
FIG. 5A is an enlarged top view of the adjustment knob of the variable resistor, and FIG. 5B is an enlarged side view including a sectional view of a portion thereof. 6A is an enlarged top view of the variable resistor rotor 6, FIG. 6B is an enlarged side view including a sectional view of a portion thereof, and FIG. 6C is an enlarged bottom view thereof.

7A is an enlarged top view of the resistor slider 7, and FIG. 7B is an enlarged side view including a sectional view of a portion thereof. Figure 8A
is an enlarged top view of the variable resistor center terminal 8, B is an enlarged side view thereof, and C is an enlarged front view thereof. 9A is an enlarged top view of the band switch knob 9, FIG. 9B is an enlarged side view with a portion cut away, and FIG. 9C is an enlarged bottom view.

FIG. 10A is an enlarged top view of the band switch slider 10, and FIG. 10B is an enlarged side view thereof. Figure 11A is an enlarged top view of the band switch
Figure B is an enlarged side sectional view of the same.

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. A rotor 6 of a variable resistor made of an insulating resin mold is rotatably mounted between the case 1 and the board 2, and the rotor 6 of a variable resistor is made of an insulating resin mold and has a resistor slider 7 fixed to the lower part that slides on the resistor 21 of the board 2. A variable resistor adjusting shaft 5 having an engaging screw portion 5B that engages with an outer peripheral gear 6B provided around the variable resistor adjusting shaft 5 is fitted onto the inner surface of the case 1 so as to be engaged therewith. Similarly, between the case 1 and the board 2, there is a band switch knob 9 made of an insulating resin mold, which has a band switch slider 10 fixed to its lower part, which performs a switch action by contacting the switch circuit on the board 2. It is rotatably mounted.

As shown in FIG. 3A, the resistor 21 on the upper surface of the rectangular substrate 2 is formed in a plurality of horseshoe shapes arranged in parallel along the upper side edge of the substrate 2 in the longitudinal direction of the substrate 2 using carbon resin paint or the like. It is formed using printing technology, etc. The individual terminal electrodes 23 on the upper side following this are connected to external terminals 23A made of a metal plate via terminal holes 23B. The lower electrode portions 22C of each horseshoe-shaped resistor 21 are connected to each other to form a common electrode 22, and are connected to the external common terminal 22A via the right end terminal hole 22B as described above.

At the center of each horseshoe-shaped resistor 21 is a rotor 6.
A rotor shaft hole 2C is provided in which the position of the resistor slider 7 is adjusted by inserting and rotating a small-diameter shaft 6C at the lower part of the rotor shaft. Parallel to and below the horseshoe-shaped resistors 21 arranged in the longitudinal direction of the substrate 2, there is provided a band switch shaft hole 2D into which the lower small diameter shaft 9D of the band switch knob 9 is rotatably inserted. Shaft hole 2D
Band switch electrodes 25C and 26 are in sliding contact with the contact portion of the band switch slider 10 on approximately concentric circles.
C, 27C are provided, and the common electric circuits 25, 2 are connected or integrated with the respective band switch electrodes.
6 and 27 on the left end, respectively common terminals 25B and 2
Switch external terminal 25A via 6B and 27B,
Connected to 26A and 27A. A plurality of fixing holes 2E, engagement notches 2E', etc. are provided in the peripheral portion of the substrate 2 to engage with fixing protrusions 1L, 1L' of the case 1 to be described later for positioning and fixing.

The resistor slider 7 made of an elastic metal plate shown in FIG.
The eighth rotor was inserted into the board through the rotor shaft hole 2C.
The eyelet 8C of the resistor center terminal 8 shown in the figure is inserted and fixed to the eyelet by rotatably caulking. The resistor slider 7 has a protrusion 7 that protrudes vertically upward.
D is engaged with an engagement square hole 6D on the lower surface of the variable resistor rotor 6, which will be described later, to be firmly fitted and fixed to the variable resistor rotor without play in the rotational direction.

The variable resistor rotor 6 shown in FIG. 6 is provided with an outer circumferential gear portion 6B on its outer periphery, which is engaged with a threaded portion 5B of a variable resistor adjusting shaft 5 in a perpendicular direction, which will be described later. A deep circular groove 6E is provided on the upper surface of the rotor 6 around the central axis to provide elasticity in the radial direction to the outer peripheral gear portion 6B of the rotor 6.
The rotor 6 has a display shaft 6A protruding upward and is rotatably engaged with a rotor hole 1A of the case 1. A rotational position indicator _6A1 is provided on the upper end surface of the display shaft. The lower surface of the rotor 6 is provided with an engagement square hole 6D that engages with the projection 7D of the resistor slider 7, and the lower surface of the rotor 6 is provided with a center hole of the eyelet 8C of the center terminal 8. A small-diameter shaft 6C that is rotatably engaged is projected downward.

The variable resistor adjustment shaft 5 shown in FIG. 5 has a threaded portion 5B in the center that engages with an outer peripheral gear portion 6B on the outer periphery of the variable resistor rotor 6, and one extension of the threaded portion 5B has an adjustment shaft. It is equipped with an adjustment knob disc part 5A that can be manually rotated at times, and a small-diameter support shaft part 5F at the tip thereof, and a collar part 5H on the other extension of the threaded part 5B, and a support shaft part at the tip of the collar part 5H. A support shaft portion 5F' having the same small diameter as 5F is provided on the same axis.

At the center of the end face of the support shaft parts 5F, 5F' at both ends of the variable resistor adjustment shaft 5, there are adjustment parts 5E, 5E made of non-circular square holes etc. for adjusting the variable resistor with mass-produced adjustment equipment in factories etc. ′ is provided.

Band switch electrode 2 of substrate 2 shown in FIG. 3A
A band switch slider 10 as shown in FIG. 10, which switches and slides on 5C, 26C, and 27C, is made of an elastic metal plate in accordance with the resistor slider 7,
The eyelet portion 1 of the band switch center terminal 12 is formed almost similarly to the resistor center terminal 8 shown in FIG. 8.
2D is inserted into the band switch shaft hole 2D of the substrate 2 from the outside of the lower surface of the substrate 2, and inserted between the substrate 2 and the slider 10 via the washer 11 shown in FIG. 11 as shown in FIG. 3B. , center hole 1 of slider 10
0D is inserted into the eyelet 12D of the band switch central terminal 12, and the eyelet 12D is caulked to rotatably attach it to the board 2.

As shown in FIG.
A small-diameter support shaft 9B that rotatably fits into the switch shaft groove 1B on the upper surface of the case protrudes, and also engages with the same circumferential arc-shaped hole 1C near the periphery of the switch shaft groove 1B on the upper surface of the case. An operating column 9C for rotating the switch is projected upward, and the side surface of the main body 9F of the knob 9 engages with an elastic protrusion 1E for moderation provided around the switch shaft groove 1B on the inner surface of the case 1. A gear-shaped cam recess 9E for moderation and positioning that constitutes the band switch moderation mechanism of No. 9.
has been established. A small-diameter shaft portion 9D protrudes from the center of the lower side of the body portion 9F of the band switch knob 9 and is rotatably engaged with the center hole of the eyelet portion 12D of the band switch central terminal 12. An engagement groove 9G is provided to fit and engage the tongue piece 10G of the switch slider 10.

As shown in FIG. 1, FIG. 2, FIG. 3B, and FIG. A rotor shaft hole 1A is provided for rotationally fitting the outer peripheral gear part 6 of the rotor 6.
Guide grooves 1J, 1J' and bearing grooves 1F, 1 for positioning and fitting the supporting shaft parts 5F, 5F' at both ends of the variable resistor adjustment shaft 5, which are equipped with threaded parts 5B that engage with the variable resistor adjusting shaft 5.
Bearing portions each having an L-shaped groove formed by F' are provided opposite to the partition plate 1G provided in the longitudinal direction of the inside of the side wall of the case 1 and the inner surface of the case 1 facing thereto.

Here, as shown in FIG. 4, guide grooves 1J and 1J' for guiding the vertical support shafts 5F and 5F' of the adjustment shaft 5 and engaging with the support shafts 5F and 5F' are located at the bottom of the guide grooves 1J and 1J'. The adjustment shaft 5 has bearing grooves 1F and 1F' which are continuously fitted and engaged with the support shaft parts 5F and 5F' in the horizontal direction, and the bearing part is formed as an L-shaped groove as a whole.
The upper ends of the guide grooves 1J and 1J' are tapered for convenient insertion.

To attach the adjustment shaft 5 to the case 1, insert the supporting shafts 5F and 5F' at both ends along the guide grooves 1J and 1J'.
When inserted from the top in Figure 4 and reaches the bottom end,
Next, push it slightly to the right along the horizontal rightward bearing grooves 1F and 1F'. Next, when the outer peripheral gear part 6B of the rotor 6 is engaged with one side (upper side in FIG. 2) of the threaded part 5B of the adjustment shaft 5 and the rotor 6 is pushed into the rotor shaft hole 1A, the adjustment shaft 5 is further A pair of support shafts 5 at both ends of the adjustment shaft 5 move to the right (downward in FIG. 2).
F and 5F' are fitted into horizontal bearing grooves 1F and 1F' which engage support shafts 5F and 5F' which are provided horizontally on the right side of the lower end of the guide grooves 1J and 1J' which are engaged with the guide grooves 1J and 1J',
The bearing is fixed to allow rotation in horizontal and vertical directions without rattling. Here, on the front side of the side wall of case 1,
Adjustment holes 5E,
Adjustment shaft hole 1K for adjusting 5E′ using a tool
is provided. In addition, an adjustment shaft 5 is provided on the top surface of the case 1.
The adjusting knob fits into the disc part 5A of the disc part 5A.
Square holes 1H are provided in parallel so that the outer edges of the holes protrude.

Here, in order to make the tuner selection mechanism with multi-row variable resistors compact and to facilitate adjustment using the adjustment shafts, it is convenient to arrange the adjustment shafts 5 in two rows alternately in the case 1. Although this configuration is used, a single row may also be used if space is available.

A switch shaft groove 1B is provided on the inner surface of the upper wall of the case 1 to rotatably support the support shaft 9B at the upper end of the band switch knob 9, and an operating column 9C of the band switch knob 9 is provided on the upper surface of the case 1 around the groove 1B on the outside of the case 1. An engaging arc-shaped hole 1C is provided to protrude and rotate concentrically with the support shaft 9B. Further, an elastic protrusion 1E protrudes from the inner surface of the case 1 and engages with a cam recess 9E for moderation on the side surface of the main body 9F of the band switch knob 9. At the periphery of the lower edge of the side wall of the case 1 are fixing holes for positioning the board 2 and notches 2E, 2.
A plurality of fixing protrusions 1L, 1L' are provided to engage and fix to E', and spacer protrusions 1M are provided at the four corners for attaching to the mounting board of the set.

Next, in the assembly of the present invention, as described above, first, the external terminals 22A, 23A, 25 are attached to each end electrode of the substrate 2.
A, 26A, 27A, respectively terminal 22B,
It is fixed via 23B, 25B, 26B, and 27B. Next, the resistor slider 7 is rotatably attached to the substrate 2 through the eyelet 8C of the variable resistor center terminal 8 as described above, and the band switch slider 10 is
is rotatably mounted through the eyelet 12D of the band switch central terminal 12. Next, the slider 7 that slides on the resistor 21 of the substrate 2 is fixed, and the eyelet 8C of the variable transformer central terminal 8 is engaged with the lower small diameter shaft 6C of the variable resistor rotor 6. The variable resistor rotor 6 is rotatably mounted on the substrate 2 by inserting it into the central hole. Similarly, the band switch slider 10 that slides on the band switch electrodes 25C, 26C, and 27C of the board 2 is fixed, and the band switch knob 9 can be rotated to the board 2 via the eyelet 12D of the band switch center terminal 12. Attach to.
A board that has been assembled in this way is called a board assembly 20. Next, a plurality of adjusting shafts 5 are mounted in the bearing grooves 1F, 1F' provided on the inner surface of the dish-shaped case 1 in alternately opposite directions in a staggered manner. This is called case assembly 30.

Next, the indicator shaft 6A of the rotor 6 rotatably fixed to the board assembly 20 is fitted into the rotor shaft hole 1A of the case 1 in the case assembly 30, and the operating column 9C of the band switch knob 9 is similarly inserted into the arcuate hole 1C of the case 1. Then, the support shaft 9B of the band switch knob 9 is fitted and engaged with the switch shaft groove 1B of the case 1, and the board assembly 20 is assembled into the case assembly 30. Here, a plurality of fixing protrusions 1 protrude through engagement holes 2E and 2E' with the substrate 2 of the case 1.
Part or all of L and 1L' are caulked and fixed together to complete the assembly.

Adjustment of the variable resistor in the present invention is performed by turning the adjustment knob disk 5A of the variable resistor adjustment shaft 5 protruding from the top surface of the dish-shaped case with your fingertips, as shown in Fig. 1, and by finely adjusting the deceleration using a worm screw and gears. Variable resistor adjustment is possible. Here, in the adjustment during mass production such as factory shipment, as described above, the rotary tool is inserted into the square holes 5E and 5E' as the adjustment part of the adjustment shaft 5 through the engagement through hole 1K in the front wall of the case 1. The adjustment shaft 5 can then be directly rotated to allow quick and accurate adjustment using an automatic adjustment machine including automatic measurement, which has great practical effects.

As mentioned above, in order to make the tuner selection mechanism with multi-row variable resistors compact and to facilitate adjustment using the adjustment shafts, it is convenient to arrange the adjustment shafts 5 in two rows alternately in the case 1. The present invention has such a configuration. In this case, the directions of the adjustment shafts 5 in each row are opposite to each other, but in the present invention, the diameters and shapes of the support shafts 5F and 5F' at both ends of the variable resistor adjustment shaft 5 are made almost the same. As a result, only one type of adjustment shaft 5 can be used, which results in low cost and easy management and assembly, which has great practical effects. It is also extremely convenient to make the adjustment parts 5E, 5E' at both ends of the support shafts 5F, 5F' into non-circular holes of the same shape drilled in the end faces, since they can be operated with a single tool that fits the square holes. It is. That is,
The adjustment parts 5E, 5E' may be slits or cross grooves, but by making them square holes of the same shape, the support shaft part 5
This improves the accuracy of F and 5F' and has the effect of reducing failures.

In carrying out the present invention, the adjustment shaft 5 may be mounted on the case 1 by any other suitable mounting method in accordance with the prior art, in addition to this embodiment.

[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. 2 is an enlarged top view of the tuner unit including a partially cut away portion of the case for explanation. 3A is an enlarged top view of the tuner unit board, B is an enlarged side cross-sectional view of the tuner unit, and B-B in FIG. 1A is shown.
The cross section is shown enlarged. Figure 4 shows mold case 1
It is a perspective enlarged explanatory view seen from the effect part of the main part.
FIG. 5A is an enlarged top view of the adjustment knob of the variable resistor, FIG. 5B is an enlarged side view including a sectional view of the same part,
FIG. 5C is an enlarged bottom view of the same. 6A is an enlarged top view of the variable resistor rotor 6, FIG. 6B is an enlarged side view including a partial sectional view of the same, and FIG. 6C is an enlarged bottom view of the same. FIG. 7A is an enlarged top view of the resistor slider 7, and FIG. 7B is an enlarged side view including a sectional view of the same portion. Figure 8A shows variable resistor center terminal 8
B is an enlarged top view, B is an enlarged side view, and C is an enlarged front view. 9A is an enlarged top view of the band switch knob 9, FIG. 9B is an enlarged side view with a portion cut away, and FIG. 9C is an enlarged bottom view. FIG. 10A is an enlarged top view of the band switch slider 10, and FIG. 10B is an enlarged side view thereof. FIG. 11A is an enlarged top view of the band switch watch, and FIG. 11B is an enlarged side sectional view thereof. 1: Case, 1A: Rotor shaft hole, 1B: Switch shaft groove, 1C: Arc-shaped hole, 1E: Elastic protrusion, 1
F, 1F': Bearing groove, 1J, 1J': Guide groove, 1
G: Partition plate, 1H: Square hole, 1K: Adjustment knob adjustment hole, 1L, 1L': Fixed protrusion, 1M: Spacer protrusion, 2: Board, 2C: Rotor shaft hole, 2D: Band switch shaft hole, 2E, 2E ': Engagement hole, 5: Variable resistor adjustment shaft, 5A: Adjustment disk part, 5B: Thread part, 5E, 5E': Adjustment hole, 5F, 5F': Support shaft part,
6: Variable resistor rotor, 6A: Display axis, 6
A ₁ : Rotation position indicator, 6B: External gear, 6C: Small diameter shaft, 6D: Engagement square hole, 6E: Circular groove, 7: Resistor slider, 7C: Center hole, 7D: Projection, 8: Variable resistor center terminal, 8C: eyelet,
9: Band switch knob, 9B: Small diameter support shaft, 9
C: Operation column, 9D: Small diameter shaft, 9E: Cam recess, 9F: Main body, 9G: Engagement groove, 10: Band switch slider, 10D: Center hole, 10G: Tongue piece, 11: Band switch 12: Band switch center terminal, 12D: Eyelet, 21:
Resistor, 22: common electrode, 25, 26, 27: common electric path.

Claims (1)

[Claims for Utility Model Registration] (1) A multi-row rotary variable resistor and a rotary band switch are provided on an insulating substrate 2 and housed in a case 1, and the variable resistor is adjusted using an adjustment knob with a deceleration rotation mechanism. In an electronic tuner selection device that adjusts a resistance value, a resistor slider 7 slides on a plurality of horseshoe-shaped variable resistor resistors 21 provided on an insulating substrate 2.
The rotor 6 is made of an elastic insulator with
A display shaft 6A protrudes from the top and rotatably engages with the rotor hole 1A on the top surface of the case 1, and a gear portion 6B is provided on its outer periphery. The variable resistor adjustment shaft 5, which is fixed to the rotor 6 and rotates the rotor 6, has a screw 5B in the center that engages with the outer peripheral gear 6B of the rotor 6, and one extension of the screw 5B has a manual screwdriver at the time of adjustment. Adjustment knob disc part 5A rotated with
and a small-diameter support shaft portion 5F at the tip thereof, and a support shaft portion 5F on the other extension of the threaded portion 5B.
A multi-row variable resistor characterized by having a support shaft part 5F' having the same small diameter as that on the same axis, and having non-circular adjustment holes 5E, 5E' in the end faces of the support shaft parts 5F, 5F' at both ends thereof. Electronic tuner selection parts including equipment. (2) Support shaft portions 5F, 5 at both ends of variable resistor adjustment shaft 5
An electronic tuner tuning component comprising a multi-row type variable resistor according to claim (1) of the utility model registration, in which F' has the same diameter and shape. (3) Adjustment parts 5E, 5 at both ends of variable resistor adjustment shaft 5
An electronic tuner tuning component comprising a multi-row variable resistor as claimed in claim (1) of the utility model registration, in which E' is a non-circular hole of the same shape.