JPS6234176B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary control signal generating device for a tuning device in a receiver, transmitter, etc. In recent years, devices that move the local oscillation frequency from a certain frequency to another during tuning have been changing from crystal synthesizers and the like to PLL synthesizers. Such a PLL synthesizer is composed of, for example, a reference frequency generator, a phase comparator, a low-pass filter, a voltage controlled oscillator, a programmable counter, etc., and its output frequency (o) is the same as the reference frequency (r) and the programmable counter. The product of the frequency division wave (N) set by the counter, that is, o=N・r, and therefore, the frequency division number (N) is set by the N control section, for example, N+
1, N+2, N+3, ... or N-1, N-
2, N-3, . . . , the output frequency (o) can be changed at intervals of the reference frequency (r). A channel selection device using such a PLL synthesizer requires a control signal generating device for counting up and counting down the N value of the program counter.
Conventionally, a count-up switch and a count-down switch are provided, and by continuing to operate one of the switches, a control signal is generated each time the count-up switch is continued. Although such switches have been replaced with optical or other switches such as photocouplers, in principle they operate in the same way as mechanical switches. Conventionally, each signal is generated by the continuation of each switch, so depending on the mechanical structure, the instantaneous connection time during continuation may vary, resulting in unstable operation. In addition, there is a drawback that it is structurally and economically difficult to configure the operating section like the rotary type that has been widely used in the past.

The present invention uses a rotary switch and generates a control signal according to the direction of rotation of the rotary switch. In other words, the switch circuit alternately turns on and off by rotating the rotary shaft. At least two circuits are provided, and the switch circuits vary the rotation angles of the rotary shaft corresponding to the range of the husband ON state, and one side of the switch circuit has a rotary switch configured such that the husbands coincide or are close to each other. The switch circuit is turned on from the OFF state.
a transition signal generation circuit that generates a transition signal when transitioning to a state or from an ON state to an OFF state, and a control signal generation circuit that generates a control signal corresponding to a time coincidence or mismatch of each of the transition signals. The gist of this is that it is composed of a circuit. The present invention will be described in detail below based on examples.

The symbol A indicates a rotary switch, and the rotary switch A is provided with at least two switch circuits S and S' that alternately turn ON and OFF by rotating the rotating shaft l of the knob 1, etc. The circuits S and S' are configured so that the rotation angles θ and θ' of the rotation axis l corresponding to the range of the ON state are different, and the boundaries e and e' on one side thereof are made to coincide or be close to each other, respectively. FIG. 2 shows a specific example of the rotary switch A, in which reference numeral 2 denotes an insulating substrate;
3 and 3' are a plurality of conductor patterns provided on concentric circles of the substrate 2 and forming one electrode of the switch circuits S and S'; This is a sliding electrode that slides along the concentric circle and forms the other electrode of the switch circuits S and S'. Here, the switch circuits S and S' in the rotary switch A may be configured to repeat ON and OFF several times per rotation of the rotary shaft l, and the configuration may be similar to the specific example. In addition to using mechanical contacts, optical and other contacts may be used, and three or more switch circuits S, S' may be provided. Incidentally, if the boundaries e and e' on one side are not completely aligned but are slightly shifted as shown in FIG. 2d as a specific example, malfunctions due to the chattering phenomenon can be reduced.
Next, reference numeral B indicates a transition signal generation circuit, and the transition signal generation circuit B is used to switch the respective switch circuits S and S' from an OFF state to an ON state or to an ON state.
A transition signal is generated only when there is a transition from the state to the OFF state. In the transition signal generation circuit B shown in FIG. 3, the switch circuits S and S' are
This shows a specific example in which a transition signal is generated only when transitioning from an OFF state to an ON state, and its operation will be explained as follows. First, the capacitors C ₁ and C ₁ ' are used to eliminate the chattering noise of the switch circuits S and S', and the resistors R ₂ and R ₂ ' and the capacitors C ₀ and C ₀ ' are time constant circuits. . Therefore, the switch circuits S and S'
When in the OFF state, voltage is applied to the capacitors C ₀ , C ₀ ′ via the resistors R ₀ , R ₀ ′, and the capacitors C ₀ ,
C ₀ ' charges the resistors R ₀ and R ₀ ' side to +, and charges the resistor R ₂ and R ₂ ' side to -. In this case, the transistor Tr ₁ ,
Tr ₁ ′ is biased by resistors R ₁ , R ₁ ′ and R ₂ , R ₂ ′,
It is in the ON state, that is, a positive voltage is generated across the resistors R ₃ and R ₃ '. In such a situation,
When the switch circuits S and S' transition to the ON state, the charges in the capacitors C ₀ and C ₀ ' are transferred to the switch circuits S and S'.
Since the discharge occurs through S' and the resistors R _{2 and} R ₂ ', the base potential of the transistors Tr ₁ and Tr ₁ ' drops and the base current stops flowing, so that the transistors
Tr ₁ and Tr ₁ ′ are turned off, and the voltage across resistors R ₃ and R ₃ ′ becomes zero. After this state lasts for a time constant determined by the resistors R ₂ , R ₂ ′ and the capacitors C ₀ , C ₀ ′, the transistors Tr ₁ , Tr ₁ ′ are turned on again, and the resistors R ₃ , R ₃ A positive voltage is generated between In this way, the transition signal generating circuit B shown in FIG. 3 generates a transition signal that drops from a positive voltage to zero voltage when the switch circuits S and S' transition from the OFF state to the ON state. . In addition to this specific example, the transition signal generating circuit B may generate a transition signal when the switch circuits S and S' transition from the ON state to the OFF state, or the transition signal may also change from zero to Of course, the signal may rise positively, that is, the logic of the signal may be positive logic or negative logic. Next, reference numeral C indicates a control signal generation circuit, and the control signal generation circuit C generates control signals corresponding to temporal mismatch and coincidence of the transition signals corresponding to the respective switch circuits S and S'. The output parts O and O' of the control signal are respectively connected to the up count input part and the down count input part of a programmable counter D of the channel selection device. Here, in the specific example _{of the control signal generation circuit C shown in FIG. 3 ,} each of the negative logic transition signals is temporally The control signal is generated only when the diode D ₁
and a transistor _Tr2 , a control signal is generated in response to one of the transition signals only when the respective transition signals of negative logic do not coincide in time. . Of course, the configuration of the control signal generation circuit C described above may be appropriately configured depending on the configuration and signal logic of the transition signal generation circuit B in the preceding stage and the configuration and signal logic of the programmable counter D in the subsequent stage. Note that, as described above, the control signal generation circuit C generates a control signal only when the transition signals coincide in time, but the coincidence of the transition signals does not mean that they completely coincide in time. It does not necessarily mean that the terms match, but it also includes matching to a degree that can be distinguished from temporal mismatch, that is, almost matching in time.

In the above configuration, when the rotating shaft l of the knob 1 etc. is rotated to rotate the sliding electrodes 4, 4' clockwise, the sliding electrodes 4, 4' will be rotated as shown in FIGS. 4. Since the conductor patterns 3 and 3' shown in Figure 4 are moved from the left to the right in the figure, the switch circuits S,
There is a time difference as shown in FIG. 4a when S' transitions from the OFF state to the ON state. Therefore, in the transition signal generation circuit B, the switch circuits S,
The transition signals S ₁ and S ₁ ' that are generated only when S' transitions from the OFF state to the ON state are also affected by the above-mentioned time difference when the switch circuits S and S' are in the ON state, as shown in FIGS. 4b and c. There will be a time difference depending on the time. Furthermore, Fig. 4b
are the base voltages of transistors Tr ₁ and Tr ₁ ′, respectively,
FIGS. 4c and 4e show the emitter voltages of the transistors Tr ₁ and Tr ₁ ', respectively. In this way, the transition signals S ₁ and S ₁ ' are input to the control signal generation circuit C temporally one after the other, so that the transition signals S 1 and S 1 ' are inputted to the control signal generation circuit C sequentially in time, so that in the absence of the other transition signal S ₁ ', as shown in FIG. _{A control signal S 2 is} generated at the output section O which produces an output in response to the transition signal S ₁ only when the transition signal S ₁ matches. no control signal is generated. Therefore, the axis of rotation l in the direction mentioned above
By continuing to rotate, the control signal _S2 is intermittently generated only at the output section O at every appropriate rotation angle, and the programmable counter D, for example, is counted up by the control signal _S2 . Tuning can be performed in the direction in which N increases sequentially as N+1, N+2, . . . .

Next, when the sliding electrodes 4, 4' are rotated counterclockwise, the sliding electrodes 4, 4' move over the conductor patterns 3, 3' shown in FIGS. 2b and 4 to the right in the figure. Since it moves from the side to the left, the switch circuit S,
The point at which S′ transitions from the OFF state to the ON state is the fourth
As shown in FIG. 4e, the transition signal generation circuit B generates the transition signals S ₁ ,
S ₁ ′ occurs simultaneously. Therefore, as shown in FIG. 4f, the control signal generating circuit C generates the transition signals S ₁ ,
A control signal S ₂ ' is produced at the output O' which produces an output only when S ₁ ' coincides, and no control signal is produced at the output O. By continuing to rotate the rotating shaft l in this direction, the control signal S ₂ ' is intermittently generated only at the output section O' at every appropriate rotation angle, and the control signal S ₂ ' Therefore, for example, the programmable counter D counts down and N sequentially becomes N-.
Tuning can be performed in the decreasing direction of 1, N-2, . . . .

As described above, the present invention provides two
By making the rotation angles corresponding to the ON states of the switch circuits of the circuit different, and configuring the boundaries on one side to be the same or close to each other, each switch circuit can be changed from the OFF state to the ON state.
The times of transition to the state or from the ON state to the OFF state are matched in one direction of rotation and mismatched in the other direction, and signals are generated in response to each of the temporal mismatch and coincidence of such transition signals. Therefore, control signals for tuning that correspond one-to-one to each of the clockwise and counterclockwise rotations of the rotary switch can be outputted separately very easily, and such control signals are formed by simply turning the switch ON and OFF. Unlike conventional devices, the waveform width can be kept constant, so the operation is extremely stable. According to the present invention, if the rotary switch continues to be rotated in the same direction, the same control signal can be generated intermittently at each appropriate rotation angle, so tuning can be done with the same operational feeling as a conventional rotary tuning device. You can select a channel by continuously pressing the push button many times, or by repeatedly moving the knob back and forth within an appropriate rotation angle to generate the same control signal. It has a very good ergonomic feel when compared to other devices.

[Brief explanation of the drawing]

FIG. 1 is a systematic explanatory diagram of the device of the present invention, and FIGS. 2 a, b, c, and d are a front view, a developed explanatory diagram, and a perspective explanatory diagram showing the main parts of a specific example of the rotary switch in the present invention, respectively. FIG. 3 is an explanatory diagram showing specific examples of a transition signal generation circuit and a control signal generation circuit, and FIG. 4 is a time chart illustrating the operation of the present invention. Symbol A...Rotary switch, B...Transition signal generation circuit, C...Control signal generation circuit, D...Programmable counter, 1...Knob, 2...Insulator substrate, 3, 3'...Conductor pattern, 4, 4'...Sliding electrode, S, S'...Switch circuit, e, e'...Boundary, l...Rotating axis, _S1 , _S1 '...Transition signal, _S2 ,
S ₂ ′...control signal, O, O'...output section.

Claims (1)

[Claims] 1 Turn on alternately by rotating the rotating shaft
- At least 2 switch circuits that repeatedly turn OFF
A circuit is provided, and each of the switch circuits has a rotary switch configured to vary the rotation angle of the rotary shaft corresponding to an ON state range, and whose boundaries on one side are aligned or close to each other; from OFF state to ON state, or
A transition signal generation circuit that generates a transition signal only when transitioning from an ON state to an OFF state, and a control that generates a control signal corresponding to a time mismatch or coincidence of the transition signals corresponding to each of the switch circuits. 1. A rotary control signal generating device for a channel selection device, comprising a signal generating circuit.