FR2770319A1 - Detector for finding mislaid objects - Google Patents

Abstract

A small transmitter (EM) emits an ultrasonic signal (SC) on pressing a button on an integral keyboard (BPX). The receiver (RE) which is attached to the object being traced detects the ultrasonic signal and sounds a buzzer (BUZ1). The transmitter has the option to have the transmitted signal encoded via the keyboard thus allowing differentiation between several devices. Different types of one are also possible.

Description

The present invention relates to an electronic device for detecting common objects lost or lost
(potefeuilles, glasses, tools, documents, keys, est... built in the form of module made up of a receiver or several receivers (RE) and of a keyboard transmitter (EM). The particularity of the electronic device proposed resides in the identification of the lost or misplaced object the object is instantly identified by one or more receivers (RE) by emitting an audible signal (s) by a buzzer (BUZ1) indicating the position of the object which allows following the ear the sound signal to go towards the object or objects in question. The device according to the invention makes it possible to identify a large number of different objects. I1 indeed has according to a first characteristic a keyboard transmitter (EM) multichannel allowing a specific coding using an encoder circuit (U4) and a keyboard provided with a series of push button (BPX) assigned to one or more receiver (s) (RE) code differently corresponding to a precise object. of modules, em etteur keyboard (EM) receiver (RE), the practical realization of the electronic device, can be realized in technology (INTEGRATED) or in technology (CMS) allowing to fix or integrate the receivers to each object even small.

The accompanying drawings illustrate the invention:
Figure 1 is a block diagram of the electronic device constituting the transmitter (EM) and receiver (RE) modules Figure 2 is a block diagram of the electronic device constituting the modules (EM) and (RE) in ultrasound mode (US)
Figure 3 is a variant of the block diagram of Figure 2 in amplitude modulation (AM). Referring to the diagrams and accompanying drawings (FIG1, FIG2, FIG3) the electronic device constructed in the form of modules consists of a keyboard transmitter (EM) comprising a keyboard fitted with a series of push buttons (BPX) and diodes (DX) programming an encoder circuit in the form of an integrated circuit (U4) (C1) (R1) transmitting a coded signal ( SC) transmitted by a transmitter circuit (U3) which can be constituted according to the particular embodiments of (U3) (US) in mode: ultrasound according to FIG. 2 or in the embodiment according to FIG. 3 of (U3) (AM ) in mode: amplitude modulation
The code signal (SC) is received by a receiver (RE) assigned to a specific object, comprising a demodulator preamp forming the circuit (U1) (US) in FIG ultrasound mode. 2 or else (U1) (AM) in amplitude modulation mode FIG.3 depending on the embodiment used. the circuit (U1) shaping The signal is transmitted to the input of a decoder formed by a circuit (U5) (.R2) (C2) carrying on its output a low level if its preprogram code coincides with that of the transmitter triggering a flip-flop formed of NAND gates (U2A) (U2B)
(R4) (C6) inverted by a NAND gate (U2C) polarizing a transistor (T1) through a resistor (R5) triggering a buzzer (BUZ1) emitting a sound signal. (S)
The power supply of the receiver (RE) is entrusted to a small rechargeable battery or not by a small photovoltaic cell
(PH) or can be made up of a lithium battery. (BATl) rechargeable or non-rechargeable button cell style. In order to be able to move easily when looking for an object. Power supply to the transmitter (EM ) can be autonomous it consists of a battery (BAT2) and can also be connected to the mains for possible recharging.

By way of nonlimiting example, the keyboard transmitter module
(EM) is inserted in a box of the type remote control box for television hung on a wall support (SM) provided with a power supply (ALIM) .L keyboard transmitter
(EM) is also provided with a safety device (SEC) allowing it to be located in the event of loss. Security (SEC) consists of a buzzer (BUZ2) triggered by a time delay (T) consisting of a monostable rocker ( U6A) (U6B) (R) (C7) of a door
(NOR) (U6C) validating or inhibiting the security (SEC) of a transistor (T2) and a resistor (R6). Security is validated if the keyboard transmitter (EM) is not hung up on its support wall (SM), after a few minutes of non-use and inhibited when used by a mercury or lamellae position change detector (DP). triggering the monostable rocker (U6A U6B R7 C7) carrying the outlet the door (U6C) at a low level. The device according to the invention is particularly intended for the detection of usual lost or lost objects.

The values and references of the components are for:
Resistors R1 100K / R2 100K / R3 100K / R4 10K / R5 4.7K / R6 4.7K / R7 470K / R8 lK / R9 10K.

Capacitors C1 150PF / C2 150PF / C3 47 MF polarized 10 volts / C4 100NF / C5 100MF polarized 16 volts
C6 100 MF polarized 16 volts / C7 470 MF polarized 16 volts.

The diodes DX 1N 4148 or equivalent.D1 1N4001 or equivalent.

Hybrid and various integrated circuits.

 U1 US / U1 AM receivers preamplifiers miniature demodulator cms and integrated genre (murata; sharp; siemens; mippot; aurel) for information only and not limitative. To be developed for integration.

U2 A / U2B / U2C NAND type 4011 or equivalent. / U3 specialized transmitter US ultrasound / AM amplitude modulation (aurel; murata; mitsubishi; mippot or equivalent. U4 encoder circuit type UM 3750; MM53200; TEA 5500. by way of nonlimiting example.U5 decoder circuit like UM 3750;
MM53200. Any decoder circuit corresponding to U4.

U6A / U6B / U6C NOR genre 4001or equivalent.

T1 and T2 NPN BC 548 C transistors; 2N 2222 or equivalent
MISCELLANEOUS BPX pushbuttons for working contact such as a keyboard or any other model./BAT1 rechargeable batteries; button-type batteries. (lithium; silver; ni-mh; sternice battery capacity) or equivalent. / BAT 2 ACCUS or conventional battery. BUZ1 and BUZ2 miniature piezo buzzer with integrated oscillator. (PH) photovoltaic cell. SM wall mount with stabilized regulated power supply. 5 to 12 volts / DP mercury or lamella position change detector or others.

Claims (7)

 CLAIMS 1) Electronic device to detect usual lost or lost objects constructed in the form of modules characterized in that it comprises a multi-channel keyboard transmitter (EM) transmitting a code signal (SC) transmitted by a transmitter circuit (U3) (US) in mode ultrasound or (U3) (AM) in mode: amplitude modulation allowing specific coding using an encoder circuit (U4) and a keyboard fitted with a series of push buttons (BPX) assigned to one receiver or to several receivers (RE ) corresponding to specific objects, emitting a sound signal (S) indicating the position of the object. 2) Device according to claims 1 characterized in that a transmitter circuit (U3) can consist of (U3) (US) in ultrasound mode or (U3) (AM) in amplitude modulation mode. 3) Device according to claim 1 characterized in that the signal (SC) is received by a receiver (RE) comprising a demodulator preamp (U1) (US) in ultrasound mode: or (U1) (AM) in modulation mode amplitude, transmitted to a decoder (U5) polarizing a transistor (T1) triggering a buzzer (BUZ). 4) Device according to any one of the preceding claims, characterized in that the practical production of the electronic device constituting the transmitter (EM) and receiver (s) (RE) modules can be carried out using technology (INTEGRATED) or  (CMS) 5) Device according to claim 1 characterized in that the power supply of the transmitter (EM) consists of a battery  (BAT2) also connected to the mains 6) Device according to claim 1 or claim 3 characterized in that the power of the receiver (RE) is entrusted to a battery (BAT1) recharged or not by a photovoltaic cell (PH). 7) Device according to claim 1 characterized in that the keyboard transmitter (EM) is provided with a security (SEC) consisting of a buzzer (BUZ2) triggered by a time delay (T).