JPS60157691A - Caller for restaurant - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention is installed in restaurants, etc., and when a push button on a transmitter installed at each table is pressed, a receiver installed at the headquarters displays which table the call came from. The present invention relates to a calling device in a restaurant that appropriately satisfies the requests of customers at the table.

Conventionally, in restaurants, each table is connected to a centralized monitoring desk at the head office through a wired communication system, thereby centrally monitoring which table receives a call, thereby improving service to customers. However, with this legged communication system, the customer floor inside the restaurant
Since the lines had to be laid on the floor of the store, it not only spoiled the mood, but also caused the risk of electrical leakage if water was sprinkled on the inside of the store.

As a way to solve this problem, a method of improving customer service without the need for transmission lines has been considered by using a communication system that uses electric light lines to utilize the open electric lights in the store. However, with this electric light line conveyance, problems remain, such as when a daytime frequency heating device such as an open one is used to warn cooking, the noise generated therefrom may cause the calling device to malfunction.

The present invention has been made in view of the above circumstances, and by transmitting the call signal from each table to the head office by wireless communication, the head office centrally monitors the call signal without any malfunction due to noise. It is intended to provide a full range of calling devices in stores.

In order to achieve this object, the present invention consists of a plurality of transmitters and one receiver, and each table is equipped with one transmitter that can be operated by dry batteries, thereby making the table completely cordless. A preferred embodiment of the invention will be described in detail, in which the combination of carrier frequency and modulation frequency is made different for each table, so that the received signal received by one receiver installed at the headquarters is subjected to amplified detection. .

FIG. 1 is an external view of the transmitter 1, which is a tabletop type transmitter box 12 having a 25CII antenna 11, and has a call switch 13 and a release switch 14 on its surface. It is more preferable if the push button switch is of internal illumination type. The power source is six single dry cell batteries (UM-3) housed in the transmitter box 12 connected in series, and when the call switch 13 is pressed, AM modulated waves are emitted from the antenna 11 for about 1.5 seconds regardless of how long the call switch 13 is pressed. is emitted, and a light emitting diode 15 disposed on the top of the antenna 11 blinks, and the blinking of the light emitting diode 15 remains on until the release switch 14 is pressed. Here, the power source is not limited to single dry batteries, but may also be rechargeable, for example, nickel-cadmium storage batteries, and is not limited to AM modulated waves but also FM
It may be a modulated wave.

FIG. 2 is an external view of the receiver 2, which is formed into a thin flat plate so that it is easy to see from which table a call is made, and the panel surface has light emitting diodes 21 to 40, a power switch 41, a buzzer 42, and a buzzer 42. A power indicator lamp 43 is provided, and an antenna terminal 44 and a power cord 45 are provided on the side surface.

This receiver is operated by an AC 100V commercial power source, and a circuit section for this purpose is built into the receiver box 46. Then, the radio waves received by the antenna connected to the antenna terminal 44 or the vinyl wires 2 to 3f7 are amplified, and after detection, one of the light emitting diodes 21 to 40 corresponding to each table number is lit up through a filter. This makes the buzzer 42 sound for a short time. In addition, there are 20 tables for light emitting diodes 21 to 40,
Therefore, although it is assumed that the number of transmitters is 20, it is not limited to this and can be expanded in any way depending on the combination of carrier frequency and modulation frequency, as shown in Figure 3. The following explanation will be based on the transmitter circuit diagram and the receiver circuit diagrams shown in FIGS. 4 and 5.

The transmitter circuit diagram is roughly composed of a carrier wave section 51, a modulation wave section 52, a time control section 53, and a power supply control section 54 as shown in the third diagram. First, the carrier wave section 51 is a transistor Q controlled by a crystal oscillator X.

It consists of a crystal oscillator consisting of a crystal oscillator and ancillary parts, a modulator consisting of a transistor Q4 which is electromagnetically coupled by a coil L1, and an antenna which is coiled and is antenna loaded with the coil L1. Since the light emitting diode 15 provided at the tip of the antenna is powered by the battery E1 and its blinking is controlled by the transistor Q, a direct current component and a high frequency component are superimposed on the antenna 15. Therefore, by keeping the high frequency at ground potential using the capacitors C, , C, the configuration is such that radio waves can be radiated more effectively than the antenna A1.

Further, the modulating wave section 52 is a phase-shifted oscillator 08C2 in which positive feedback is provided by parallel T-type feedback elements consisting of resistors R3, R4, and capacitors C, , C4, and cllxD.
and a buffer amplifier AMP, which performs AM modulation on the carrier wave via a modulation transformer T. These carrier wave section 51 and modulated wave section 52 are connected to the battery E1 and the series control transistor Ql of the power supply control section 54 for a time (approximately 1.5 seconds) controlled by the time control section 53, as described later.
Electricity is supplied via e, and transmission radio waves are radiated for only this 1.5 seconds.

Furthermore, the time control unit 53 is a monostable multivibrator M
MV+, a % flip flop circuit FF, and an oscillator OSC for lighting the light emitting diode.When the battery power switch SwI is turned on by capacitors C6 and C7 and power is supplied from battery E, the monostable multivibrator MMV, The output terminal ■ is set to L'' level which is an inactive output, and the output terminal @ of the flip circuit FF is also set to an inactive output level uLn. Therefore, the transistor QiON of the power supply control section 54 is set to As a result, the transistors Q and C are turned off, and power is not supplied from the battery E1 to the carrier wave section 51 and modulation wave section 52, so the transmission voltage is not radiated, and the output of the LED blinking oscillator OS C+ of the time control section 53 is unique. “Since the HII level is high, the series control transistors Q and O
At FF, the light emitting diode 15 disposed at the tip of the antenna 11 is also turned off.

Now, when the call switch 13 is pressed, the output terminal ■ of the monostable multivibrator MMV will go to the active output level for a time determined by the time constant of the resistor R1 and the capacitor CI, in this case about 1.5 seconds, regardless of the pressing time. uH#, the transistor Q2 of the power supply control section 54 is turned off, and the series control transistor Q is turned off.

is turned ON, and the battery E is connected to the carrier wave section 51 and modulation wave section 52.
, powered by more. Therefore, an AM modulated transmission radio wave is radiated from the antenna 11 at a carrier frequency determined by the crystal oscillator x1 and at a modulation frequency determined by the parallel T-type feedback elements R1 to R0 and C3 to C5. Similarly, the flip-flop circuit de F.

The output terminal O of is a monostable multivibrator MMV.

"L" level which is the phase inversion of the active output level "H" of
Since the ``H'' level of the υ set state is achieved by the ``Ln level which is the phase inversion of H#, the LED blinking oscillator 08 is activated by the oscillation frequency determined by the positive ``1 pre-relaxation element R3 and the 00 time constant.
Since CI oscillates and turns transistor Q on and off, light emitting diode 15 starts blinking. However,
Flip-flop circuit FF.

Due to the memory function, it continues to blink even after approximately 1.5 seconds have elapsed, and when the release switch 14 is pressed, the flip-flop circuit FF becomes set and its output terminal returns to the inactive level "L#". Then, the output of the LED blinking oscillator OS C+ becomes constant at the °'H'' level, the transistor Q is turned off, and the light emitting diode 15 is turned off.

FIG. 4 is a circuit diagram mainly explaining the receiving section of the receiver, and FIG. 5 is a circuit diagram mainly explaining the display section of the receiver. 63 and a display matrix 64.

First, the receiving section 61 is a normal superheterodyne type receiver, which has one stage of high frequency amplification and two stages of intermediate frequency amplification, and converts the DC component in the linear detection output from the diode into an AVC voltage using a high frequency amplifier. It is returned to the base of each of the first stages of the intermediate frequency amplifier. The local oscillators are controlled by crystals, and in this embodiment, six local oscillators, X1 to X6, are installed, and they are switched electronically by a ring onlator section 62.

Further, the ring onlator section 62 includes a series-connected shift register SR+ of six or more stages, an AND circuit of ``L'' active consisting of diodes D2 to D6, and an inverter I.
It consists of a self-oscillating clock pulse generator CPI consisting of V1 to IV3. Note that the shift register SR, is 6
It may also be one in which more than one D-type flip-flop circuit is connected in cascade.

Furthermore, the low frequency amplification and filter group 63 amplifies the detected output and rectifies it as a P wave, including a preamplifier from the operational amplifier OP1 and a low frequency amplifier from the operational amplifier OP2. , a high-amplifier such as operational amplifier OP3, and a filter (including a rectifier (not shown), so its output becomes a DC voltage1) FIL, ~F I L
, Karana υ, a KI L" active OR circuit in which these eight filter outputs are ORed by diodes D7 to D,4, and a buzzer sounding circuit are added.

Furthermore, the display matrix 64 is a two-person AND game) AND+~ANDto flip-flop circuit FF
,~FF,. , transistors Qu~Q3゜ that drive the light emitting diodes with emitter followers, and light emitting diodes OD, ~0Dzo, which are arranged in a matrix of 5 rows and 4 columns as shown in Figure 5. is. As is well known, the local oscillation frequency of the superheterodyne system is set to a value that either adds or subtracts an intermediate frequency to the carrier frequency of the received radio wave, and the low frequency component in the detection output is set to the modulation frequency of the received radio wave. equal. Therefore, each Q output of the ring-on lator 62 for switching the local oscillator crystal oscillator XI-X is connected in series, and the filter F! L...
The matrix in which the rectified DC outputs of the 10-F I Ls are arranged horizontally and used as inputs to the two-man AND gate can be said to select the combination of the carrier frequency and modulation frequency of the transmitter shown in Figure 3. .

The receiver of the present invention having such a configuration operates as follows.1 First, the radiated radio waves from each transmitter received by the antenna Ar of the receiver are amplified in high frequency by the transistor Q1 in the high frequency amplification stage. It is applied to the base of the mixer transistor Q2. On the other hand, since the local oscillation voltage of the local oscillation transistor Q is injected into the emitter, the frequency is mixed and the (receiving frequency - local oscillation frequency = intermediate frequency) component is output, resulting in an intermediate frequency formed by the transistors Q and Q. The signal is multiplied by two stages with a diode D1, and a downstream component and a low frequency component are extracted with a linear detector having a diode D1. The DC component is added as an AVC voltage to the Q and Qρ bases, and the low frequency component is the modulation frequency component of the transmitter, which is preamplified by the operational amplifier OP1, and then the low frequency component is added to the high frequency range by the operational amplifier OP1. Increase each part with an operational amplifier OP]
and 8 filters FI Lll-F IL and FI
L, ~FI L4. Here, filter F
IL+ ~ FIL♂ are capacitor C, -Ca and resistor R, ~
Although it is a passive or active filter whose bandpass frequency can be varied by R6, it may also be a tuning fork or a vibrating element filter, and this output voltage is output as a DC voltage by a rectifier built into the filter.

Next, the local oscillator will be explained. This is a crystal controlled oscillator that is oscillated by switching ordinary crystal oscillators X1 to Xs, and is a shift register SR with six or more stages.

The local oscillation frequency is sequentially switched by a ring oscillator 62 which is configured to be reset by an AND circuit including diodes D2 to D6. This switching period is determined by the clock pulse generator CP made up of inverters IV and ~3, and a slower one is more reliable and desirable in order to fully identify which table's transmitter the radio waves are radiated from, but two or more at the same time Considering the case where radio waves are radiated from the transmitter in the table above, the faster the faster the better, and the local frequency switching cycle is selected as a compromise between the two.

In order to select and light up the light emitting diodes OD, ~OD, of the display section from the output of the receiving section of the receiver configured in this way, two-man power AND game (AND+) is used as shown in Figure 5.
~ANDzo-/i3 flip-flop circuit R8°~
R8,,,) A light emitting diode lighting circuit consisting of transistors Qo to Q30 is illustrated in solid lines in Figure 5, 5 rows x 4 columns = 2
Although 0 sets are implemented, this is because this embodiment assumes that there are 20 transmitters, and if the parts indicated by dotted lines are also implemented, it can be implemented in 8 rows x 6 columns = 48 sets. Next, the Q outputs Q1 to Q6 of the local oscillator switching ring oscillator 62 are input to one input of each of the two-man power ANy-to ANDn to 3o, and all the outputs of the filters F i Ll to FIL♂ are input to the other input. By applying voltage to form a matrix, the carrier frequency and modulation frequency of the radio waves radiated from any of the 20 transmitters are the same as the (local frequency to intermediate frequency) of the received signal and the detected low frequency signal frequency. Only those that match A
ND will be removed. AND output is -7 lip flop circuit FF, ~FF'to set input terminal 1
3-8 is applied to keep the flip-flop circuit in the set state, so even if the transmitted radio wave disappears after about 1.5 seconds, it continues to be memorized and the display monitor LEDs OD+ to 0D2oe light up via transistors QN to Qsok. Keep doing it. At the same time, the outputs of FIL, ~FIL, are ORed by the OR circuit.

This causes the buzzer BZe to sound for only 1.5 seconds each time a radio wave is received to alert employees. In addition, the illuminated LED can be turned off by manually pressing the SW after the employee confirms that the release switch 14 on the transmitter has been pressed and the LED 5 at the tip of the rod antenna 11 on each table has been extinguished. % flip-flop circuit FF.

~FF,. This is done by applying an active input to the set input terminal R to reset the flip-flop circuit.

The present invention having such a configuration is not limited to customer service at restaurants; for example, if a transmitter is installed at each position on the production line in a manufacturing factory and a receiver is installed at the headquarters, This allows you to fully identify in which position on the production line an abnormality has occurred, even if you are at the headquarters. Further, although the release switch 14 is arranged on the front panel of the transmitter box as shown in the first figure, an option is also possible in which it can be released from the edge of the table by attaching a long line.

As described above, since wireless communication is used according to the present invention, there is no problem even if the inside of the store is renovated and table positions are changed in order to attract more customers. Moreover, since which table is identified by the combination of carrier frequency and modulation frequency, for example, if the carrier frequency and modulation frequency are each 10 waves, one receiver set at the headquarters can handle up to 100 tables. Since calls can be identified, it is easy to add more tables. In this case, one transmitter is required for each table, so of course it is necessary to add more transmitters, but it is possible to arrange several transmitters in one group for several tables, and the headquarters If it is recognized that the call has come from a table somewhere in the list, additional tables can be added without adding transmitters or receivers. Moreover,
The transmitter is cordless and has a built-in battery, so it is easy to move, and if you take measures such as hanging the menu from the antenna, it will not spoil the mood, and this is highly effective, as well as reducing the number of staff at restaurants and improving service. This is something that will help you improve.

[Brief explanation of the drawing]

Figure 1 is an external view of the transmitter, Figure 2 is a view of the receiver lA, and Figure 3 is an external view of the transmitter.
The figure is a transmitter circuit diagram, and FIGS. 4 and 5 are receiver circuit diagrams.

Claims (1)

[Claims] In a restaurant, a transmitter in which a combination of carrier frequency and modulation frequency is pre-assigned to each table or table group, and a receiver installed at the headquarters are connected by legless communication, and the transmission on each table is connected. A calling device for a restaurant, characterized in that in response to the operation of the machine, a display section of a receiver determines which table is located, and also causes a buzzer or the like to sound.