JPS5938747Y2 - Channel selection device - Google Patents

Description

[Detailed description of the invention] This invention presets several markers for tuning at the tuning point position of the broadcasting station that you want to receive and tune (predetermined reception frequency position on the reception frequency display scale of the scale plate). For tuning devices that allow you to immediately tune into the desired broadcast station by simply aligning the pointer with the above marker by rotating the tuning knob, in particular, set the markers for the two reception bands on the scale plate. This paper attempts to propose a channel selection device configured so that it can be arranged in parallel on the same line.

The inventors of the present invention have already discovered that by aligning the pointer with a marker preset at the tuning point position of the broadcast station you wish to receive, you can receive FM-
We have proposed a channel selection device that automatically selects the broadcasting station at the preset position of the marker without switching between each AM reception band. Since dedicated markers are used for each band (FM-AMQ reception band), the mechanism is complicated and an inexpensive channel selection device cannot be provided.

In view of these circumstances, the present invention is designed so that one marker is F.
It is an object of the present invention to provide a channel selection device that can be used for both MM and AM stations, and is constructed so that the respective markers can be arranged in parallel on the same line on a scale plate.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 shows the front part of a radio receiver incorporating the present invention, FIG. 2 shows the mechanical part of the preset channel selection device built into the radio receiver, and FIG. The mechanism valve of the tuning device is shown in an exploded manner, and FIG. 4 shows an example of an electric circuit configuration useful for use in the preset tuning device of the present invention.

First, to explain the configuration of the preset channel selection device of the present invention, as shown in FIG. 1, a front panel 2 of a radio receiver 1 has a transparent plate 3 on the front side, as shown in FIG. A rectangular window 4 is provided, and this window 4
FM and AM reception frequency display scales 6, 6 of a long scale plate 5 as shown in FIG. 3 disposed inside the radio receiver 1 can be seen from here.

On the rear surface of the plate-shaped scale display section 7 of the scale plate 5 having the scales 6.6, a protruding piece 8a and a guide rail 8b are formed at the upper and lower parts thereof, respectively, and protrude toward the back.

On the guide rail 8b, as shown in FIG. 1, a large number of markers 9 to 18 which are used for both FM station and AMJ are arranged.

Each of the markers 9 to 18, which can be used for both FM and AM stations, is movable freely in the longitudinal direction of the scale plate 5, and is located at the tuning point position of the broadcasting station that you want to receive (reception frequency display scale 6.6). However, before being preset, it is preset at the left and right end positions of the scale plate 5, for example, the rightmost position on the scale plate 5 in FIG.
Shown with imaginary lines.

), and when preset, they are moved one by one from the above arrangement position to a predetermined tuning point position, and are preset to the tuning point position of each desired broadcast station.

Between the projecting piece 8a and the guide rail 8b, and also at the back of the scale display section 7, a plate-shaped and long code plate 19 as shown in FIGS. 2 and 3 is arranged and fixed. Ori,
On the back side D of this code plate 19, a code pattern 20 for specifying the division ratio of the program pull divider for changing the reception frequency is formed in a program corresponding to the reception frequency display scale 6+6 for each FM-AM station. has been done.

On the other hand, as shown in FIGS. 2 and 3, at the rear position of the scale plate 5 and between the protruding piece 8a and the guide rail 8b,
A long guide shaft 21 is arranged parallel to the scale plate 5, and the guide shaft 21 is rotatably supported at both ends thereof by bearing members (not shown).

On this guide shaft 21, as shown in FIG. 3, a pointer stand 23 equipped with a removable pointer 22 is mounted, and as shown in FIG. 2, a tuning rough 2240 is rotatably attached to the front panel 2. It is attached so that it can freely move in the longitudinal direction of the guide shaft 21 via a tuning thread 25 that is driven by rotation.

As shown in FIG. 2, in a predetermined position on the front surface of the pointer stand 23 inserted close to the back surface of the scale display section 7 of the scale plate 5,
A slider 26 is attached which can freely slide on the code pattern 20 of the code plate 19.
6, the code pattern 20 is changed by the movement of the pointer stand 23.
4), and at that sliding position, from the code pattern 20, the program full divider 270 shown in FIG. 4 detects a specific program code signal for specifying the division ratio. It is a pointer stand 2
FM-AM indexed by pointer 22 attached to 3
A program code signal for setting the reception frequency corresponding to the reception frequency display scales 6, 6 is detected from this slider 26 as an inverted binary coded signal.

The program code signal of the inverted 2-digital signal detected from the slider 26 is supplied to a changeover switch 29 for manual tuning via the lead wire 28, and this changeover switch 29 switches between each receiving section for FM/All. It is selectively supplied to either one of the control signal generators 30 and 31.

The code signal supplied to the control signal generator 30 for the FM station is converted into a binary coded decimal signal by this generator 30, and a phase-locked loop 33 follows the phase of the received signal input to the FM receiving antenna 32. is supplied to the program pull divider 27 in the

This divider 27 has a predetermined frequency division ratio specified by the code signal described above, and further divides the frequency-divided output signal obtained by dividing the local oscillation signal from the voltage controlled oscillator 34 by the frequency division ratio of the prescaler 350. The frequency-divided output signal obtained by dividing the frequency by the frequency division ratio is supplied to the phase comparator 36.

The phase comparator 36 is supplied with a predetermined reference signal from the reference signal generator 37, and performs a phase comparison between this reference signal and the frequency-divided output signal.

The oscillation frequency of the voltage controlled oscillator 34 is locked by the comparison output signal obtained from the phase comparator 36.

On the other hand, an intermediate frequency signal that has been passed from the FM receiving antenna 32 to a high frequency amplification circuit 38 and converted to a predetermined frequency by a mixing circuit 39 is amplified by 40 stages of intermediate frequency amplification circuits, and then supplied to a multiplex 41 where it is stereo demodulated. , and further supplied to each output terminal 42, 42, is a first receiving section A1 consisting of an FM receiving antenna 32, a high frequency amplification circuit 38, a mixing circuit 39, and an intermediate frequency amplification circuit 40, and a multiplex 41. An input signal detecting means 43 (for example, a DC amplifier) for detecting the presence or absence of an input signal (FM input signal) to the first receiving section A1, and an input signal detecting means 43 (for example, a DC amplifier) between the output section A2 and the Depending on the presence or absence of the input signal of the detection means 43, the FM terminal 44 on the first receiving section A1 side or the first receiving section A1
A switching means 46 that can be selectively switched to either one of the second receiving section B having a similar configuration and the AM terminal 45 on the (for example, AM broadcasting station receiving section) side is disposed.

Note that the switching means 46 is the manual channel selection switch 2.
In conjunction with the switching operation of 9, the above FM terminal 44 and All
However, if the program detection button 47 (see FIG. 1) is pressed for a long time, it can be switched to the FM terminal 44.

Further, the switching means 46 is configured to switch the first output section A2 in this way.
(e.g. FM broadcast station output section) multiplex 41
while the second output B2 (e.g. AM
It is also connected to the AM detector 48 of the broadcasting station output section).

In addition, in the space of the pointer stand 23, as shown in FIG.
9 is housed therein, and this photo ink converter 49 is constructed by arranging a light emitting element 50a such as an LED or a lamp and a light receiving element 50b such as a phototransistor in a positional relationship such that they face each other. and
Each marker 9 to 1 that can be used for both the FM station and AM station described above
Optical 0N-OF is achieved by the light blocking or non-blocking functions of the light blocking portions 60 formed protruding from the backs of the
It functions as each changeover switch of F.

By using these ON/OFF operations, the positions of each marker 9 to 18 can be detected, while a mu lamp circuit (not shown) is used to remove noise between each broadcast station. It also has an ON-OFF function for use.

In the through hole 61 formed in the central part of the sliding table 23,
The guide shaft 210 is slid on the guide shaft 21 by a sliding table 23 in the longitudinal direction thereof.
A catcher member 62 rotates in the same direction as the rotation occurs.
is installed.

This catcher member 62 is for each of the markers 9 to 18.
This functions to move the signal to the tuning point position of the desired broadcasting station (a predetermined frequency position on the reception frequency display scales 6, 6).

Note that with the index portion 63 of an arbitrary marker, for example, the first marker 9 and the pointer 22 of the pointer stand 230 aligned with each other as shown in FIG. 1, the catcher member 62 is rotated counterclockwise in FIG. When the catcher member 62 is rotated in this direction, a portion of the catcher member 62 is inevitably inserted into a through hole 64 formed in the main body of the marker 90.

Next, in the preset tuning device of the present invention having the above configuration, the operation procedure for presetting each marker to the tuning point position of the desired broadcasting station to be received, and the reception tuning operation for the desired broadcasting station after this presetting. The procedure will be explained.

First, in order to preset, each marker 9 to 18, which can be used for FM broadcast stations and AM broadcast stations, is used. Here, first, the first marker 9 is used as a marker for FM broadcast stations. An example will be explained in which the marker 9 is preset at the tuning point position of the desired broadcast station among the FM broadcast stations.

First, press the power switch 65 in advance (see Figure 1),
Next [By pressing the FM station function push button 66a, the manual channel selection changeover switch 29
is connected to the FM terminal 29a.

In addition, in conjunction with this changeover switch 29, the changeover means 4
6 is also connected to the FM terminal 44.

Next, while looking at the pointer stand 230 and pointer 22, turn the tuning knob 24 and use the tuning thread 25 to
Both the pointer stand 23 and the catcher member 62 that is moved by the pointer stand 23 are moved in the longitudinal direction of the guide shaft 21, and,
The leftmost marker 9 to 18 is placed in advance at an arbitrary position on the scale plate 5 (for example, the rightmost position on the scale plate 5 as shown by the imaginary line in FIG. 1). 1
The indicator part 63K of the marker 9, the above-mentioned pointer stand 230 pointer 2
Match 2.

Note that when the index portion 63 of the marker 9 and the pointer 22 of the pointer stand 23 accurately match, the catcher member 62 will be located directly below the through hole 64 of the marker 90.

Next, the guide shaft 21 is rotated counterclockwise in FIG. 2 by pressing the preset push button 67 shown in FIG. 1 and using a remote control mechanism (not shown) driven by the push button 67. A part of the catcher member 62, which rotates in the same direction as the guide shaft 21, is inserted into the through hole 64 of the first marker 90.

Once the insertion is complete, the state remains (i.e.
While keeping the preset push button 67 pressed, the tuning knob 25 is rotated again to move the marker 9 in the longitudinal direction of the scale plate 5 by the catcher member 62.

At this time, the slider 26 attached to the front surface of the pointer stand 23 slides on the code pattern 20 of the code plate 19 while sequentially changing its contact position. The child 26 sequentially detects a predetermined program code signal for specifying the division ratio of the programmable divider 270 from the code pattern 20.

Therefore, the operator can easily locate the desired frequency (desired best tuning point) on the received frequency display scale 6 for FM stations by simply moving the first marker 9 in the longitudinal direction of the scale plate 5. can.

When the desired broadcasting station is manually received and selected, the rotation of the tuning knob 2240 is stopped at that position, and the suppression of the preset push button 67 is released.

When the pressure on the preset push button 67 is released, the catcher member 62 rotates clockwise in FIG.
A part of it comes out from inside the through hole 64 of the first marker 90, and the connection between the catcher member 62 and the marker 9 is released.

Through each of the above operations, the first marker 9 is preset as a marker for an FM broadcast station at the tuning point position of the desired broadcast station to be received within that broadcast station.

Next, in order to use the second marker 10 as a marker for an AM broadcast station and preset it to the tuning point position of the broadcast station you wish to receive, press the function push button 66b for the AM station. , the manual channel selection changeover switch 29 is connected to the AM station terminal 29bK.

Note that at this time, the switching means 46 is connected to the AM station terminal 45.

Next, by performing a presetting operation similar to that for the first marker 9 described above, first align the pointer 22 of the pointer stand 23 with the index portion 63 of the second marker 10, and then press the preset push button 67. Insert a part of the catcher member 62 into the through hole 64 of the second marker 100, and turn the tuning knob 2 again while it remains inserted.
4, the second marker 10 is preset to the tuning point position of the desired broadcasting station while performing manual tuning.

By using the above-described operating procedure, the remaining third markers 11 to 10th markers 18 are used to preset them to the tuning point positions of the desired FM or AMJ broadcast stations.

Next, the operation for selecting a desired broadcasting station will be explained.

The tuning operation is extremely simple. First, by pressing the program detection button 47 shown in FIG. 1, the manual tuning switch 29 is connected to the respective FM station terminal 29a or AM station terminal 29b. At the same time, the switching means 46 is connected to the FM station terminal 44 of the first receiving section A (Fun receiving section).

Next, it is sufficient to rotate the tuning knob 24 and bring the pointer 22 into alignment with one of the markers 9 to 18 preset at the position of the desired receiving station by the above-described operation.

Now, for example, move the pointer 22 to the index portion 63 of the first marker 9.
Since the first marker 9 has been preset at a predetermined FMQ tuning point position by the above-described operation, the FM intermediate frequency amplifying circuit 40 receives a predetermined amount or more of F.
An M input signal (FM radio wave) is input.

Therefore, the switching means 46 is connected to the FM terminal 44 by the action of the input signal detecting means 43, so the intermediate frequency amplifying circuit 40 and the multiplex 41 in the FM reception %A1 are in a conductive state, and therefore the FM broadcasting The station is selected for reception.

Next, when the pointer 22 is aligned with the index portion 63 of the second marker 10, the second marker 10 is preset to a predetermined AMQ tuning point position by the above-described operation, so the FM intermediate frequency No AM radio waves are input to the amplifier circuit 40.

Therefore, the switching means 46 is connected to the AM terminal 45 by the action of the input signal detecting means 43, so the intermediate frequency amplification circuit 68 and the AM detector 48 in the AM receiving section B1 are in a conductive state. The broadcasting station is selected for reception.

As described above, when the pointer is aligned with the indicator of the predetermined marker, the FM broadcast station becomes ready to be received, and at that time, the intermediate frequency amplification circuit in the first receiving section (FMQ receiving section) When the FM input signal to be received is input into the first receiving section, the first receiving section and the first output section are brought into conduction via the input detecting means and the switching means, and the FM broadcasting station is directly connected to the first receiving section and the first output section. is received and selected.

If the FM input signal is not input to the intermediate frequency amplification circuit, the switching means is connected to the second receiving section (AMQ receiving section) side by the function of the input detecting means, and therefore the switching means is connected to the second receiving section (AMQ receiving section) side. The unit and the second output unit are brought into conduction, and an AM broadcasting station is received and selected.

Note that when FM4 and AM stations are at the same tuning point position on the scale plate, the FM station has priority.

In addition, in the above-mentioned embodiment, the first receiving section was described as an FMFM receiving section and the second receiving section was described as an AMQ receiving section, but conversely, the first receiving section was described as an AM receiving section and the second The receiving section may be configured as an FM receiving section.

Furthermore, the first and second receiving sections may be configured of receiving sections capable of receiving radio waves having different radio wave modulation formats.

Furthermore, in the embodiment described above, the slider 26 was configured to slide on the code pattern 20 and detect a predetermined code signal to control the receiving frequency, but a resistor with a DC voltage source provided at both ends The slider 26 slides on the body pattern, thereby making the capacitance of the variable capacitance diode of the voltage-controlled local oscillator variable, which can also be applied to a tuning device in which the receiving frequency is controlled. .

As is clear from the above description, according to the present invention, one marker can be used for both radio waves with different radio wave modulation formats (for example, AM radio waves and FM radio waves), so it is possible to arrange them in a row on the same line on the scale plate. Therefore, the mechanism for attaching each marker can be simplified.

In addition, according to the present invention, each marker can be arranged in a line on the same line on the scale plate, so one set of photointerrupters for turning the Muhlung circuit ON and OFF is sufficient. A publicly inexpensive channel selection device can be provided.

Further, according to the present invention, each marker can be used for FM broadcast stations or AM broadcast stations, so that each marker can be used for each desired broadcast of FM broadcast stations, AM broadcast stations, etc. according to the wishes of the listener. The number of stations can be changed freely.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the front part of a radio receiver to which a preset tuning device according to the present invention is applied, and FIG. 2 is a preset tuning device inside the radio receiver taken along line A-A in FIG. 1. Fig. 3 is an exploded perspective view showing the mechanical part of the preset channel selection device;
The figure is a block diagram showing an example of the electrical circuit configuration used in the preset channel selection device of the present invention. 1-...Radio receiver, 5...Scale plate, 6,6...-
Received frequency display scale, Rinai to 18...FM station/A
Marker for M station, 20...Code pattern, 21
... Guide shaft, 22 ... Pointer, 23 ... Pointer stand,
24...Tuning knob, 25...Tuning thread, 26...Slider, 43...Input signal detection means, 46...Switching means, 62...Catcher member, A1... First receiving section, A2... second output section,
B1... second receiving section, B2... second output section.

Claims (1)

[Scope of utility model registration request] A scale plate having a plurality of reception frequency display scales, a number of markers that are moved in the longitudinal direction of the scale plate and preset at predetermined frequency positions on the reception frequency display scale, and a back of the scale plate. is slid in the longitudinal direction of the guide shaft through a rotatable guide shaft disposed parallel to the guide shaft and a tuning thread disposed on the guide shaft and driven by rotation of the tuning knob. a pointer stand with a pointer, a catcher member that moves in the longitudinal direction of the guide shaft together with the pointer stand and presets the marker at a predetermined frequency position on the received frequency display scale; It is equipped with a pattern formed corresponding to a frequency display scale and a slider that detects a desired control signal for setting the reception frequency by sliding on this pattern, and the pointer and marker of the pointer stand are connected to each other. In a channel selection device configured such that a desired broadcasting station is selected for reception when the two numbers match, a first and second receiving section that receives radio waves having different radio wave modulation formats, and a channel corresponding to each of these receiving sections are provided. an input signal detection means for detecting the presence or absence of an input signal to the first receiving section;
and a switching means disposed between each receiving section and each outputting section and selectively switching to each of the first and second receiving sections depending on the presence or absence of an input signal of the input signal detecting means. A channel selection device featuring: