JPS6214751Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a push-button channel selection device, and particularly to a push-button channel selection device suitable for application to channel switching in CATV and the like.

A push-button channel selection device used for channel switching generally has a plurality of channel selection push buttons and one band switching knob, and each channel selection push button has a plurality of buttons for selecting a predetermined channel of each band. A channel selection switch is provided. In such a push button channel selection device, when a predetermined channel selection push button is pressed, the channel selection switch corresponding to the band selected by the band switching knob is selected from among the plurality of channel selection switches corresponding to the channel selection push button. A tuning voltage of a desired channel is applied to the tuner via. If the band switching knob is provided in the push-button channel selection device in this manner, there is no need to prepare a push button for channel selection for each channel, and the device can be made more compact.

However, such a push-button channel selection device has disadvantages in that the channel selection operation is relatively troublesome because it uses both a push button and a knob, which have different operations, and the switching mechanism for the band switching knob is complicated.

SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a push button station selection device which does not require the use of a band switching knob, can digitally switch channels, is easy to operate, and is compact and well designed.

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

FIG. 1 is a configuration diagram of a channel selection circuit formed on a printed circuit board of a push button channel selection device according to the present invention. In the figure, +B is a constant voltage power supply terminal, TC is a terminal that applies the tuning voltage of a predetermined channel to the tuner, P00 ~
P39 is a group of potentiometers arranged in a matrix of M rows and N columns (10 rows and 4 columns), and potentiometer Pi (i = 00, 02...39) sets the tuning voltage of the i-th channel and outputs the voltage. The tuning voltage is output from the terminal. Note that since the o-th channel does not exist, potentiometer P00 may be removed. SW00 to SW39 are contacts provided corresponding to each potentiometer P00 to P39, PL is a power line, CL0 to CL3 are common conductors provided in each column, and the potentiometers in each column have corresponding contacts. It is connected to the common conductor of the column via. For example, the first row of potentiometers P00
~P09 are connected to the common conducting wire CL0 via contacts SW00~SW09, respectively. CSW0~
CSW3 is a contact for column selection. 4 contact groups in each row, for example 4 contact groups in the (i+1)th row
SW0i, SW1i, SW2i, SW3i (i=
0, 1,...9) are operated (turned on) by a single digit selection push button, which will be described later, provided in the i-th row, and each column selection contact CSW0 to CSW3 is provided correspondingly. It is activated (turned on) by pressing a 10-digit selection push button, which will be described later. Therefore,
For example, if you want to select channel 21,
Second row contacts SW01, SW11, SW21, SW
Press the 1-digit selection push button corresponding to 31, and press 10 corresponding to the column selection contact CSW2 in the third column.
When the digit selection push button is pressed, contact SW21 and column selection contact CSW2 are turned on, and potentiometer P is turned on.
The tuning voltage of the 21st channel set to 21 is the contact point.
SW21 → Common conductor CL2 → Column selection contact CSW2
is applied to the tuner from terminal TC via.

FIG. 2 is an external plan view of the push button channel selection device according to the present invention, where PB00 to PB09 are push buttons for selecting one digit;
PBC0 to PBC3 are push buttons for 10-digit selection, FVR is a knob for fine adjustment of setting voltage, and CBL is an external connection cable. Push buttons PB00 to P09 for selecting one digit are all contacts SW0i and SW0i for one row shown in Fig. 1, respectively.
SW1i, SW2i, SW3i (i=0, 1, 2...
9) at the same time, and push button PBCj for selecting 10 lines.
(j=0, 1, 2, 3) similarly operates the column selection contact CSWj shown in FIG. Therefore, for example, if you want to select the 21st channel, press the 10-digit selection push button PBC2 and the 1-digit selection push button PB01 to turn on the contact SW21 and the column selection contact CSW2, which will change the tuning voltage of the 21st channel. is applied to the tuner and images of the 21 channels are received.

FIG. 3 is an exploded perspective view of the push-button channel selection device according to the present invention, FIG. 4 is an assembled sectional view thereof, and FIG. 5 is a back pattern diagram of a printed circuit board on which the channel selection circuit (FIG. 1) is mounted.

In the figure, 11 is a plastic push button for selecting 10 digits, and the push buttons PBC0 to 10 digits shown in FIG.
Corresponding to the PBC 3, when the operation block 11a, the contact pressing protrusion 11b, and the 10-digit selection push button 11 are pressed, a first interlocking cam plate (to be described later) is pressed and rotated, and is provided on the first interlocking cam plate. It has a cam engagement protrusion 11c that engages with the engagement protrusion. 12
is a plastic one-digit selection push button;
It corresponds to the one-digit selection push buttons PB00 to PB09 shown in the figure, and includes an operation block 12a, four contact pressing protrusions 12b to 12e, and a spring engaging protrusion 12f (fourth
) and a cam engagement that presses and rotates a second interlocking cam plate (described later) when the single-digit selection push button 12 is pressed, and engages with an engaging protrusion provided on the second interlocking cam plate. It has a protrusion 12g. 13 and 14 are coil springs. The coil spring 13 is inserted into the contact pressing protrusion 11b of the 10-digit selection push button 11, and biases the 10-digit selection push button in the opposite direction to the pressing direction, and the coil spring 14 is for 1-digit selection. It is inserted into the spring engaging protrusion 12f of the push button 12 and urges the single digit selection push button in the opposite direction to the pressing direction. Reference numeral 15 denotes an L-shaped first interlocking cam plate, one of which is commonly provided for each of the 10-digit selection push buttons. Further, on one surface of the base plate portion 15a, engagement protrusions 15b and continuous protrusions 15c are provided corresponding to the respective 10-digit selection push buttons, and each engagement protrusion 15b
and the continuous protrusion 15c form a recess 15d (Fig. 4).
is formed. Further, a continuous protruding piece 15e forming an L-shape with the base plate part 15a is formed at the top of the other surface of the base plate part 15a, and holes 16f for attaching a frame are formed at both lower ends of the base plate part 15a. has been done. When the 10-digit selection push button 11 is pressed, the cam engagement projection 11c presses the engagement protrusion 15b, and the first interlocking cam plate 15 begins to rotate counterclockwise, and the 10-digit selection push button 11 is pressed. By further pushing in, the cam engaging protrusion 11c falls into the recess 15d and engages with the engaging protrusion 15b, thereby pressing the 10-digit selection push button 1.
1 is locked in the pressed state. 16 is an L-shaped second interlocking cam plate, which is common to each single digit selection push button.
There are several. An engaging protrusion 16b and a continuous protrusion 16c are provided on one surface of the base plate 16a in correspondence with each one-digit selection push button 12. Recessed portion 16d
(Fig. 4) is formed. Moreover, the substrate part 16a
A continuous protruding piece 16e forming an L-shape with the base plate is formed on the top of the other side of the base plate, and a frame mounting hole 16f is formed at both lower ends and in the center of the base plate 16a. There is. When the push button 12 for selecting one digit is pressed, the engaging protrusion 16b is pushed by the cam engaging projection 12g, the second interlocking cam plate 16 begins to rotate clockwise, and the push button 12 for selecting one digit is pressed. By pushing it further, the cam engaging protrusion 12g falls into the recess 16d and engages with the engaging protrusion 16b, so that the push button 12 is locked in the pressed state. Reference numeral 17 denotes a pair of coil springs attached to a frame, which will be described later, and a protruding piece 15e of the first interlocking cam plate 15.
Press button 1 for selecting 10 digits by touching the first interlocking cam plate.
The cam engaging protrusion 11c and the engaging protrusion 15b are urged in a direction opposite to the rotating direction caused by the pressure 1 to maintain the engagement between the cam engaging protrusion 11c and the engaging protrusion 15b, that is, the pressed state of the 10-digit selection push button is maintained. 18, 18 are a pair of coil springs attached to the frame, which will be described later, similar to the coil spring 17.
The second interlocking cam plate 16 comes into contact with the protruding piece 16e and urges the second interlocking cam plate in a direction opposite to the direction of rotation caused by pressing the single digit selection push button 12, thereby causing the cam engagement protrusion to close. 12g and the engaging protrusion 16b are maintained, and the pressed state of the one-digit selection push button is maintained. 19
is a frame made of insulating material with push button 11 for selecting 10 digits.
and a push button 12 for selecting one digit.
a accommodating portion 19b for accommodating the same, a protrusion 19c formed on one side wall of the frame 19 and inserted into each hole 16f of the second interlocking cam plate 16 to support the second interlocking cam plate, a coil spring 18, 18 and a bottom plate 19e. still,
On the other side wall of the frame 19, a protrusion 19c' supporting the first interlocking cam plate 15 and a coil spring 17,1 are provided.
A protrusion 19d' for attaching 7 is formed. or,
The bottom plate 19e has a total of four through holes 19f through which the contact pressing projections 11b of the four 10-digit selection push buttons 11 pass, and contact pressing projections 12b, 12c, 12d of the ten 1-digit selection push buttons 12. A total of 40 through holes 19g through which the holes 12e pass are formed. 20 is an insulating sheet, and each through hole 19f, 1 formed in the bottom plate 19e of the frame 19 is
Mountain-shaped protrusions 20 at positions corresponding to 9g
a, 20b are provided, and conductive movable contacts 20c, 20d are provided inside each protrusion. still,
The movable contacts 20c, 20c... correspond to the movable contact parts of the column selection contacts CSW0 to CSW3 shown in FIG. 1, and the movable contacts 20d, 20d... correspond to the selection points SW00 to SW39 shown in FIG. Compatible with movable contact parts. Reference numeral 21 denotes a printed circuit board on which the channel selection circuit shown in FIG. 1 is formed. FIG. 5 is a pattern diagram of such a printed circuit board, and the potentiometers P00 to P39 shown in FIG. 1 are mounted on the back side. In the figure, PT00 to PT39 are output voltage terminals of potentiometers P00 to P39 formed on the back side, CL0 to CL3 are common conductors provided for each column, and CSW0' to CSW3' are column selection terminals shown in Figure 1. Fixed contact part of contacts CSW0 to CSW3, SW0
Similarly, 0' to SW39' are the contacts SW shown in Figure 1.
It is a fixed contact part of 00 to SW39. That is, movable contacts 20c, 20c... formed on the insulating sheet 20
and a fixed contact portion formed on the printed circuit board 21.
CSW0' to CSW3' form the column selection contacts CSW0 to CSW3 shown in FIG.
The off operation is performed by pressing the 10-digit selection push button 11. Moreover, the movable contact 2 formed on the insulating sheet 20
0d, 20d... and the fixed contact parts SW00' to SW39' formed on the printed circuit board 21 form the contacts SW00 to SW39 shown in FIG. controlled by 22 is a volume block for fine adjustment of the tuning voltage, which includes a fine adjustment volume 22a, a bracket 22b for mounting the fine adjustment volume,
It has an operating knob 22c. 23 is a bottom plate (Fig. 4), 24 is a cabinet, windows 24a, 24a, .
Windows 24b, 24b where the digit selection push button 12 is exposed...
It has a window 24c through which the operating knob 22c is exposed.

Next, the operation when each push button is pressed in the push button channel selection device according to the present invention will be explained.

Push button 11 for 10 digit selection (Fig. 4) into coil spring 1.
3, the engaging protrusion 15b of the first interlocking cam plate 15 is pressed against the cam engaging protrusion 11c according to the pressing stroke amount, and the first interlocking cam plate 15 begins to rotate counterclockwise,
At a predetermined pressing stroke amount, the cam engagement protrusion 1
1c falls into the recess 15d, and the engaging protrusion 15
b. In this state, even if the push button 11 for 10-digit selection is released, the first interlocking cam plate 15
Since is pressed by the coil spring 17, the engagement between the cam engagement protrusion 11c and the engagement protrusion 15b is maintained, and the pressed state of the 10-digit selection push button 11 is locked. Then, by pressing the 10-digit selection push button 11, the contact pressing protrusion 11b presses the corresponding movable contact 20c (Fig. 3), and selects a predetermined fixed contact portion.
Short-circuit one of CSW0' to CSW3' (Fig. 5). In addition, when the pressing state of the 10-digit selection push button 11 is locked, when another 10-digit selection push button is pressed, the first button is pressed according to the pressing stroke amount.
The interlocking cam plate 15 begins to rotate counterclockwise, and the locked 10-digit selection push button 11 disengages from the first interlocking cam plate 15, and the 10-digit selection push button 11 is moved by the coil spring 13. The spring force causes the contact to return to the non-pressed position, and at the same time, the short circuit between the corresponding fixed contact portions is also released. Thereafter, when the other 10-digit selection push button 11 is further pressed, the pressed state of the 10-digit selection push button is locked by the above-described action.

On the other hand, when the one-digit selection push button 12 (FIG. 4) is pressed against the spring force of the coil spring 14, the engaging protrusion 16b of the second interlocking cam plate 16 engages with the cam according to the pressing stroke amount. Pressed by the mating protrusion 12g, the second interlocking cam plate 16 begins to rotate clockwise, and at a predetermined pressing stroke amount, the cam engaging protrusion 12g falls into the recess 16d and engages with the engaging protrusion 16b. . In this state, even if the push button 12 for selecting one digit is released, the second interlocking cam plate 16 is pressed by the coil spring 18, so the engagement between the cam engagement protrusion 12g and the engagement protrusion 16b is maintained. The pressed state of the push button 12 is then locked. By pressing the one-digit selection push button 12, the contact pressing projections 12b, 12c, 12d, 1
2e presses the corresponding contact 20d (Fig. 3),
Among the fixed contact sections SW00' to SW39' (FIG. 5), four fixed contact sections in a predetermined row are short-circuited. next,
When the pressing state of the 1-digit selection push button 12 is locked, when another 1-digit selection push button is pressed, the second interlocking cam plate 16 rotates clockwise according to the pressing stroke amount. The single digit selection push button 12 and the second interlocking cam plate 16, which were initially locked,
The one-digit selection push button 12 is returned to the non-pressed position by the spring force of the coil spring 14, and at the same time, the short circuit between the corresponding fixed contact portions is also released. Thereafter, when the other one-digit selection push button 12 is further pressed, the pressed state of the one-digit selection push button is locked by the aforementioned action.

When selecting the desired channel from the above,
If a predetermined push button among the four 10-digit selection push buttons 11 is pressed and a predetermined push button among the ten single-digit selection push buttons 12 is pressed, the pressed state of each push button is locked, and the corresponding contact point is When turned on, the tuning voltage of the desired channel is applied to the tuner, making it possible to receive images and audio.

As described above, according to the present invention, there is no need to use a band switching knob, and moreover, channels can be switched digitally, resulting in good operability. In addition, since the push button is structured to be locked, the selected channel can be determined by the difference in level when the push button is locked.
There is no need to provide a separate means for displaying the selected channel. Furthermore, when selecting a channel, there is a 10-digit selection push button,
Either one of the 1-digit selection push buttons can be used first, or 25
If you want to select 26 channels from the channel selection state, you only need to press the 1-digit selection button.
Furthermore, if you want to select 15 channels from the 25 channel selection state, you only need to press the 10-digit selection push button, and it has excellent operability. Furthermore, the push button channel selection device of the present invention does not require a push button for each channel, so it is compact and has an excellent design.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the channel selection circuit formed on the printed circuit board of the push-button channel selection device according to the present invention, Fig. 2 is an external plan view of the push-button channel selection device according to the present invention, and Fig. 3 FIG. 4 is an exploded perspective view of such a push-button channel selection device, FIG. 4 is an assembled sectional view thereof, and FIG. 5 is a pattern diagram of a printed circuit board on which a channel selection circuit is mounted. P00~P39...Potentiometer, SW0
0 to SW39...Contact, CSW0 to CSW3...Contact for column selection, 11...Push button for selecting 10 digits, 12...
1 digit selection push button, 13, 14...Coil spring, 1
5... First interlocking cam plate, 16... Second interlocking cam plate, 17, 18... Coil spring, 19... Frame, 20... Insulating sheet, 21... Printed circuit board, 24... Cabinet.

Claims (1)

[Scope of utility model registration request] A plurality of electronic tuning potentiometers are arranged in a matrix of M rows and N columns on one board, and a push button is used to selectively take out one of the set voltages of each potentiometer and apply it to the tuner. In the channel selection device, a contact is provided at the output voltage terminal of each potentiometer, and a common conductor is provided for each column, and the output voltage terminals of the group of potentiometers in each column are connected to a predetermined common conductor through the corresponding contact. A column selection contact is provided between each common conductor and the tuner, a first push button is provided for each row corresponding to the contact of the potentiometer group in each row, and a column selection contact is provided between each common conductor and the tuner. A second push button is provided corresponding to each of the column selection contacts arranged in the column selection contacts, and a predetermined first push button is pressed to operate the plurality of contacts in the row corresponding to the pressed first push button, In addition, by pressing a predetermined second push button to operate the corresponding column selection contact, select the second one of the plurality of operating contacts.
A push button channel selection device, characterized in that a contact in a column corresponding to a push button is selected, and a tuning voltage is applied to a tuner via the contact and the column selection contact.