JPH0124981Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a printed circuit board mounting structure for a push button tuner, in which the front end of the printed circuit board is held by a resin holder to which a lamp for illuminating a frequency display board can also be mounted, and an engaging concave portion and a caulking convex portion are provided. Printed circuit board mounting of push button tuner that eliminates the need for mounting screws and lamp holders by twisting and caulking the rear end of the printed circuit board using a formed metal holder, facilitating installation work and reducing the number of parts. The purpose is to provide structure.

In the conventional push button tuner's printed circuit board mounting structure, an L-shaped protrusion with a screw hole was provided protruding from the top of the frame, and the printed circuit board was placed on this protrusion and screwed into the screw hole. .

However, this method has the drawback that it requires screw rotation work during installation and removal, making the work cumbersome.

In addition, a lamp for illuminating the frequency display board is attached to the top of the push-button tuner, but in the past, in order to attach this lamp, a separate lamp mounting holder was provided by screwing it to the top of the push-button tuner. It is necessary to install the
Another drawback was that a large number of parts were required.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings.

1A to 1C are a plan view, a front view, and a side view of a push button tuner to which an embodiment of the push button tuner printed circuit board mounting structure of the present invention is applied, respectively, and FIG. 2 is a longitudinal sectional view of the push button tuner described above. be.

In the figure, a push-button tuner 1 has a printed circuit board 4 disposed above a frame 3 of a tuner body 2.

The frame 3 has a rectangular frame shape made of a metal plate, and has front and rear side plates 3a, 3b, left and right side plates 3c, 3d, and the front side plate 3a has a pair of L-shaped protrusions 3 that respectively protrude upward.
e (having an engaging plate portion 3e-1), and the rear plate 3b has a cutout recess 3f (shown in FIG. 2) at the upper portion.

5, 5-1 to 5-5 are a plurality of push button rods, each having a regulating element 7, a push button 8, etc. on a sliding plate 6 as shown in FIG. It is supported so that it can slide in the B direction. The specifier 7 collides with the rolling frame 9 by pushing and sliding the push button rod 5, and the specifier 7 itself rotates during memorized tuning, and the rotating frame 9 rotates when selecting a readout channel to hold the core holding plate 10. The core 11 is moved in and out of coils 22 and 23 of a coil case 12, which will be described later, to perform μ tuning. The three push button rods 5-1 to 5-5 on the right are for the FM band, and the two on the left 5-1 and 5-2 are for the AM band.

Further, the upper cam portion 6a of the sliding plate 6 collides with a band switching plate 14, which will be described later, and the lower cam portion 6b collides with a clutch switching plate 15 (shown in FIGS. 1A to C) to open the clutch mechanism 21. This is to remove the load on the manual tuning shaft side from the rolling frame 9.

The coil case 12 is formed of, for example, zinc die-casting, and is screwed into the notch recess 3f of the rear side plate 3b so as to protrude inward from the frame 3. As shown in FIG. 3A, the coil case 12 has a pair of engaging projections 12a on the lower surface, and three AM projections on the right side when viewed from the front.
A band coil 22 and three FM band coils 23 are housed on the left side, and as shown in FIG. It has 25.

The AM band terminal board 24 has three pairs (six) substantially U-shaped terminals 26 embedded therein, as shown in FIGS. 1A to 4C and FIG. One end 26a of each terminal 26 protrudes rearward to which the leads of the coils 22 are connected, and the other end 26b protrudes rearward and diagonally upward with a spring property to form a predetermined print 4a of the printed circuit board 4, which will be described later. press against.

As shown in FIGS. 2 and 3A and 3B, the band switching plate 14 has three FM band cam recesses 14a on the right and two AM band cam recesses 14b on the left in the front part of the metal band plate. They are arranged at equal pitches, respectively, and have a pair of engagement holes 14c and an engagement arm portion 14d (having an engagement recess 14d-1) bent and extending upward from the right end.
This band switching plate 14 is attached below the coil case 12 so that each engagement hole 14c is fitted into each engagement protrusion 12a so that it can slide freely in the directions of arrows C and D. Further, the cam portions 6a of the push button rods 5-1 to 5-5 correspond to the cam recesses 14a and 14b, respectively.

27 is a pair of resin holders, and 28 is a pair of metal plate holders. The resin holders 27 each have a fifth
As shown in the figure, it has an engagement hole 27a, an engagement recess 27b, a pair of elastic arm parts 27c, and a hole 27d between them, and the engagement hole 27a is connected to the L-shaped protrusion 3e of the frame 3, respectively. -1 is press-fitted and installed.

As shown in FIG. 4, each of the metal plate holders 28 has an engaging protrusion 28a and a caulking protrusion 28b on the upper part.
They are screwed to both sides of the rear side plate 3b of the frame 3, respectively.

The printed circuit board 4 forms a band switching and tuning circuit, and as shown in FIG. 5, a band switching switch 29 (having a switching knob 29a),
Frequency display board illumination lamp 30 (its lead wire 3
0a, with connector 30b), and other
Contains chips such as ICs, resistors, capacitors, and transistors. The substrate 4 has prints on its lower surface, especially six prints 4a (shown in FIG. 4) for connecting the AM band terminals 26, and a pair of engagement holes 4b (shown in FIG. 4). ), and has a slot 4c (shown in FIG. 5).

This printed circuit board 4 is arranged above the frame 3 of the tuner main body 2 by fitting the front end of the board into the respective engaging recesses 20b of the pair of holders 27 and connecting the pair of engaging holes 4b to the respective convex parts of the pair of holders 28. 28a, 2
8b, each caulking convex portion 28
It is fixed by twisting and caulking b. At this time, the engagement arm 14d of the band switching plate 14 is connected to the slot 4c.
is inserted and protruded, and its engagement recess 14d-1 engages with the switching knob 29a of the band switching switch 29. In addition, the lead wire 30a of the lamp 30 is connected to the holder 27.
The lamp 30 is passed through the gap between the arm portions 27c with elastic deformation of the arm portion 27c, and is regulated and held in a state in which the lamp 30 is accommodated and passed through the hole 27d, thereby facilitating position setting of the lamp 30.

Also, at this time, terminal 2 of the AM band terminal board 24
The other end portions 26b of 6 are pressed against the print 4a on the lower surface of the printed circuit board 4, and both 26b and 4a are connected by soldering.

According to the above configuration, the printed circuit board 4 is attached to the frame 3.
At the same time, the engagement recess 14d-1 of the engagement arm 14d of the band switching plate 14 engages the switching knob 29a of the band switching switch 29, thereby eliminating the need for independent engagement work and reducing man-hours. Furthermore, since the switch terminal of the changeover switch 29 itself is inserted into the printed circuit board 4 and connected directly to the bottom print by soldering, there is no need to route lead wires, which further reduces the number of man-hours. At the same time, there is no fear of lead wire breakage, etc., and reliability can be improved.

Also, at the same time as installing the printed circuit board 4 and frame 3, the terminals 26 of the AM band terminal board 24 are installed.
Since the other end 26b comes into pressure contact with the print 4a,
There is no need for positioning work or lead wire routing work, and soldering connection can be made immediately, reducing the number of man-hours and improving reliability.

In addition, the printed circuit board 4, especially the front side, is attached to the frame 3 via a resin holder 27.
The holder 27 is attached to the protrusion 3e of the frame 3 with one touch, and the printed circuit board 4 is attached to the holder 2.
Since it can be attached to the engagement recess 27b of 7 with one touch, both 4 and 3 can be attached and removed with one touch without the need for screws etc., reducing the number of assembly steps. −
Since the impact at the time of pressing 1 to 5-5 is absorbed and not transmitted to the printed circuit board 4, the circuit of the printed circuit board 4 is protected and reliability can be improved. Also printed circuit board 4
The convex portion 2 of the metal plate holder 28 is also on the rear side.
Since it is only necessary to caulk the caulking convex portion 28a after engaging with the convex portions 8a and 28b, the attachment and detachment operations thereof are easy.

Note that the printed circuit board 4 may also be attached to the frame 3 at two rear locations using the resin holders 27, respectively.

Next, the operation of the band switching plate 14 of the push button tuner 1 will be explained. First, in the state shown in FIG. 3B, the leftmost AM band push button rod 5-1 is pushed in the direction of arrow A, and the upper cam portion 6a is moved to the band switching plate 14.
This shows a state in which the band switching plate 14 slides in the direction of arrow C after being abutted against the AM band cam recess 14b. As a result, the engaging arm 14d also moves in the same direction, so that the switching knob 29a of the band switching switch 29 is also switched and slid in the same direction to select the AM band.

Next, in FIG. 3B, after the push button rod 5-1 returns,
For example, when the FM band push button rod 5-3 is pushed in, the upper cam portion 6a moves into the FM band cam recess 14a.
The band switching plate 14 (engaging arm portion 14d)
slides in the direction of arrow D from position B in the figure.
Accordingly, the knob 29a of the band changeover switch 29 is also switched and slid in the same direction, and now the FM band is switched.

As mentioned above, according to the printed circuit board mounting structure of the push button tuner according to the present invention, the printed circuit board is fixed above the frame using a resin holder without the need for screws, so screw rotation work is required. It can be installed and removed with one touch, reducing man-hours, and the resin holder also functions as a holder for the lamp for frequency display board illumination.
There is no need to provide a separate holder for holding the lamp, and the present invention has the advantage of reducing the number of parts and facilitating assembly work.

[Brief explanation of the drawing]

1A to 1C are a plan view, a front view, and a side view of a push-button tuner to which an embodiment of the push-button tuner printed circuit board mounting structure of the present invention is applied, respectively; FIG. 2 is a longitudinal cross-sectional view of the push-button tuner; Figures 3A and 3B are front views of the coil case and band switching plate unit of the push button tuner, respectively, and Figures A and B-
A cross-sectional view taken along line B, and FIGS. 4 and 5 are exploded perspective views of the main part of the push button tuner and other main parts, respectively. 1... Push button chuyuna, 2... chuyuna body, 3
...Frame, 4...Printed circuit board, 4b...Print, 5 (5-1 to 5-5)...Push button rod, 6...
...Sliding plate, 9...Rolling frame, 10...Core holding plate,
12...Coil case, 14...Band switching board,
15... Clutch switching plate, 22, 23... Coil, 24, 25... Terminal board, 26... Terminal, 2
6a... one end of the terminal, 26b... the other end of the terminal, 2
7, 28...Holder, 29...Band selection switch.

Claims (1)

[Scope of Claim for Utility Model Registration] A push button rod, etc., consisting of a printed circuit board on which a plurality of terminals of a terminal board connected to a lamp for illuminating a frequency display board and a coil for μ tuning are provided with a printed circuit board that is press-fitted and connected by soldering. In the printed circuit board mounting structure for a push button tuner mounted on a frame supporting the frame, the front plate of the frame has an elastic arm for mounting the frequency display illumination lamp, and an engagement recess into which the front end of the printed circuit board is fitted. a resin holder made of a resin holder, and a metal holder having an engagement protrusion and a caulking protrusion formed on the rear side plate of the frame to pass through an engagement hole formed in the printed circuit board, Fitting and engaging the front end of the printed circuit board into the engagement recess of the resin holder, and engaging the engagement hole formed in the printed circuit board with the engagement protrusion and caulking protrusion of the metal holder, A printed circuit board mounting structure for a push button tuner, wherein the printed circuit board is mounted to the frame by twisting and caulking the caulking convex portion.