Patent Description:
Metal detectors are widely used in security inspection, mine detection and recreational detection. The products involved in this patent are mainly related to the field of recreational detection. In the field of recreational and security detection, the detectors are mainly divided into full-size metal detectors and metal detectors in terms of size is between. Both the two kinds of metal detectors are composed of detection coil components, signal processing parts, acoustic optic and vibration alarmers and other components. During the detection process, the user first uses the full-size metal detector for large area scanning, and then starts to use the metal detector to accurately locate the target after hearing the expected signal.

Metal detection activities are mainly carried out in outdoor spaces such as fields and rivers. Metal detectors at the present stage are waterproof based on this feature. Since full-size metal detectors are large in size, it is allowed to use a coil driven loudspeaker with a diameter of <NUM> or larger as the sound alarm component in the circuit control box. Another significant advantage is that the coil driven loudspeaker can emit a variety of alarm sound combinations according to the loudspeaker with a diameter of <NUM> or larger as the sound alarm component in the circuit control box. Another significant advantage is that the coil driven loudspeaker can emit a variety of alarm sound combinations according to the requirements of the developer, such as linear alarm sound, pulse alarm sound, a mixture of the two alarm sounds, or even customized melodic music. It can also remind users of the types of underground metal by emitting high and low tones. Conventional handheld metal detectors are smaller in size than full-size metal detectors. For example, the metal detection pinpointer in the handheld metal detector is only about the size of an electronic toothbrush, and the diameter is limited to about <NUM> based on the size of the human palm. Therefore, the existing products on the market at the present stage all use a piezoelectric buzzer, and the buzzer is hidden inside the detection body to meet the waterproof requirements. In handheld metal detectors, the waterproof design reduces the volume of the buzzer by more than half, which is not conducive for the user to hear the alarm sound of the detector in time, and this type of buzzer can only generate a single pulse alarm, instead of multiple alarm sounds which help users distinguish metal types. And after the loudspeaker is damaged, it cannot be replaced separately, and the entire circuit board needs to be replaced. The document "Nokta Pointer USER MANUAL" describes the operating procedures of a metal detector and shows a metal detector having the loudspeaker located in a control unit that is connected to an end of the body of the metal detector using a fastener; document <CIT> describes a wireless audio speaker capable of being screwed onto a drinking bottle neck; document <CIT> describes a wireless bottle cap speaker adapted for a bottle; document <CIT> describes a Bluetooth sound box; document <CIT> describes a cylindrical shape of an external speaker for a mobile phone for preventing rotation.

The present application will be further described below with reference to the accompanying drawings for further clearly and fully discussing the technical solutions of the present application.

With reference to <FIG>, an audible end cap <NUM> is provided in the present application, including a waterproof loudspeaker <NUM> a back cover <NUM> and an audio connector <NUM>. The waterproof loudspeaker <NUM> is used for generating multiple alarm sound combinations, in which the diameter of the waterproof loudspeaker <NUM> is greater than <NUM>. The waterproof loudspeaker <NUM> is installed in the back cover <NUM>, and the back cover <NUM> is provided with a first connecting portion <NUM>, through which the back cover <NUM> can be fixedly installed on the metal detector. The waterproof loudspeaker <NUM> is electrically connected to the audio connector <NUM>, and the metal detector is electrically connected to the audio connector <NUM>, so that the waterproof loudspeaker <NUM> can receive and emit the sound signal output by the metal detector. The audible end cap <NUM> further includes a protective collar <NUM>, a first protective bracket <NUM>, and a second protective bracket <NUM>. The waterproof loudspeaker <NUM> is fixedly clamped between the first protective bracket <NUM> and the second protective bracket <NUM>. The protective collar <NUM> is sleeved and fixed on the outer periphery of the first protective bracket and the second protective bracket. And the protective collar <NUM> is fixedly installed in the back cover <NUM>. The protective collar <NUM>, the first protective bracket <NUM>, the second protective bracket <NUM> and the waterproof loudspeaker <NUM> are all contained in the back cover <NUM>. The protective collar <NUM> is provided with a snapping groove <NUM>. The first protective bracket <NUM> includes a first snapping ring plate <NUM>, and the second protective bracket <NUM> includes a second snapping ring plate <NUM>. The first snapping ring plate <NUM> and the second snapping ring plate <NUM> abut against each other and are fixedly engaged in the snapping groove <NUM>. The first protective bracket <NUM> further includes a docking ring plate <NUM>. A docking groove <NUM> is provided on the second protective bracket <NUM>. When the first protective bracket <NUM> and the second protective bracket <NUM> clamp and fix the waterproof loudspeaker <NUM>, the docking ring plate <NUM> is inserted into the docking groove <NUM>. The back cover <NUM> is provided with a receiving cavity <NUM>. The protective collar <NUM> is fixedly installed in the receiving cavity <NUM>. The second protective bracket <NUM> further includes a mounting barrel <NUM>, and the audio connector <NUM> penetrates the entire mounting barrel <NUM>.

In this embodiment, the waterproof loudspeaker <NUM> is first placed in the second protective bracket <NUM>, and then the connecting junction between the waterproof loudspeaker <NUM> and the second protective bracket <NUM> is coated with resin sealant, so that the connecting junction between the waterproof loudspeaker <NUM> and the second protective bracket <NUM> can be sealed and waterproof. Then the first protective bracket <NUM> is fixed and covered on the waterproof loudspeaker <NUM>. The first snapping ring plate <NUM> and the second snapping ring plate <NUM> are engaged in the snapping groove <NUM> so that the protective collar <NUM> is sleeved on the outer periphery of the first protective bracket <NUM> and the second protective bracket <NUM>. The protective collar <NUM> can play a very good protective role because the protective collar <NUM> is made of rubber material. The docking ring plate <NUM> is arranged at the bottom of the first protective bracket <NUM>. The diameter of the docking ring plate <NUM> is smaller than that of the first snapping ring plate <NUM>, and it can just be inserted into the docking groove <NUM>. In this embodiment, the audio connector <NUM> is an audio plug, and the audible end cap <NUM> can be connected to the metal detector by directly plugging the audio plug into the metal detector. The waterproof loudspeaker <NUM> is a diaphragm loudspeaker with a diameter of <NUM>, which can emit a variety of alarm sound combinations according to the need of the developer, such as linear alarm sound, pulsed alarm sound, a mixture of the two, or even customized melodic music. And the waterproof loudspeaker <NUM> can also remind users of the types of underground metal by emitting high and low tones. The top of the back cover <NUM> can be designed in different shapes according to actual conditions. For example, two hanging holes are provided on the top of the back cover <NUM> to facilitate the suspension of the back cover <NUM>. Another advantage of placing the loudspeaker at the end place is to avoid interference of detection coil.

With reference to <FIG>, a handheld metal detector <NUM> is provided in the present application, including a host <NUM> and the above-mentioned audible end cap <NUM>. The host <NUM> is provided with a second connecting portion <NUM>. The back cover <NUM> can be installed on the tail portion of the host <NUM> through the screw connection between the first connecting portion <NUM> and the second connecting portion <NUM>. A waterproof ring <NUM> is fixedly sleeved at the bottom of the outer circumference of the second connecting portion <NUM>. When the first connecting portion <NUM> is screwed and rotated to the bottom of the second connecting portion <NUM>, the waterproof ring <NUM> can abut against the first connecting portion <NUM>. The host <NUM> is also provided with an audio output interface <NUM>, and the audio connector <NUM> can be inserted into the audio output interface <NUM>.

In this embodiment, the first connecting portion <NUM> and the second connecting portion <NUM> are provided with mutually matched threads, through which, the back cover <NUM> can be freely installed and disassembled on the tail portion of the host <NUM>. Since the waterproof ring <NUM> is arranged at the bottom of the outer circumference of the second connecting portion <NUM>, when the first connecting portion <NUM> and the second connecting portion <NUM> are completely engaged, the waterproof ring <NUM> can ensure good waterproof performance between the connecting junction. The audio output interface <NUM> is an audio socket, and the audio connector <NUM> is directly inserted into the audio output interface <NUM> to electrically connect the audible end cap <NUM> and the host <NUM>.

With reference to <FIG>, five types of audible end caps <NUM> designed according to actual needs are shown. These five types of audible end caps <NUM> are slightly different in internal structure and connection modes. With reference to <FIG> and <FIG>, the first connection mode of the audible end cap <NUM> is that the audio connector <NUM> is directly electrically connected to the waterproof loudspeaker <NUM>. The audio connector <NUM> is an audio plug, and the audio output interface <NUM> is an audio socket. The audible end cap <NUM> can be electrically connected to the host <NUM> through the cooperation of the plug and the socket. With reference to <FIG>, the second connection mode of the audible end cap <NUM> is that the audio connector <NUM> is a conductive wire, which is directly connected to the waterproof loudspeaker <NUM>, and the conductive wire goes through the mounting barrel <NUM>. The audio output interface <NUM> is correspondingly arranged as a conductive wire connection end. With reference to <FIG>, the third connection mode of the audible end cap <NUM> is that the audio connector <NUM> is a spring pin electrical connector, and the audio output interface <NUM> is set as a corresponding connector. The spring pin connecter is electrically connected to the waterproof loudspeaker <NUM>. With reference to <FIG>, the connection mode of the audible end cap <NUM> is the same as that of the first connection mode, but there are some changes in the internal structure. Compared with the first type of the audible end cap <NUM>, the protective collar <NUM> is removed from this audible end cap <NUM>, and the first protective bracket <NUM> and the second protective bracket <NUM> are directly fixedly connected by resin sealant, and then the fixedly connected structure is fixedly installed in the back cover <NUM>. With reference to <FIG>, compared with the structure of the audible end cap <NUM> in <FIG>, the first protective bracket <NUM> and the second protective bracket <NUM> are missing. The waterproof loudspeaker <NUM> is directly fixed in the back cover <NUM> through resin sealant, and a connecting wire from the waterproof loudspeaker <NUM> is electrically connected to the host <NUM>.

In the handheld metal detector provided in the present application, the host <NUM> is provided with an OLED screen and LED indicators for displaying menu operation information and real-time detection signals. There are separate red and green LED indicators on both sides to express the detection result with a variety of different types of information. For example, when red is displayed, it means that the handheld metal detector has detected ferrous metals, and when emerald green is displayed, it means that the handheld metal detector has detected non-ferrous metals. The host <NUM> is provided with buttons such as a power button and a menu button for adjusting the switch and gear position. With reference to <FIG>, a logical corresponding diagram of the logic of the dual-button menu of the host <NUM> and the OLED screen display is shown, and the button logic on the host <NUM> is designed as shown in the figure. With reference to <FIG> and <FIG>, the alarm mode of the handheld metal detector provided in the present application can be clearly seen from the description diagram of the linear-pulse mixed alarm mode of the handheld metal detector and the description diagram of the pulse tone divided into high and low tones. When the pulse tone is sharp and high, it indicates that non-ferrous metals are detected. When the pulse tone is deep and low, it indicates that ferrous metals are detected. In the linear-pulse mixed alarm mode of the handheld metal detector, the sequence of linear and pulse can be reversed, that is, the long-distance target corresponds to a pulse alarm and the short-distance target corresponds to a linear one. In the same way, the high and low tones of the pulse tone can be reversed too.

Claim 1:
An audible end cap (<NUM>), comprising:
a waterproof loudspeaker (<NUM>), for generating multiple alarm sound combinations, wherein the diameter of the waterproof loudspeaker (<NUM>) is greater than <NUM>;
a back cover (<NUM>) provided with a first connecting portion (<NUM>) whereby the back cover (<NUM>) is configured for being fixedly installed on a metal detector, wherein the waterproof loudspeaker (<NUM>) is installed in the back cover (<NUM>);
an audio connector (<NUM>) electrically connected to the waterproof loudspeaker (<NUM>), wherein the waterproof loudspeaker (<NUM>) is capable of receiving and emitting the sound signal output by the metal detector through the electrical connection between the metal detector and the audio connector (<NUM>);
wherein the audible end cap (<NUM>) further comprises a protective collar (<NUM>), a first protective bracket (<NUM>), and a second protective bracket (<NUM>), wherein the waterproof loudspeaker (<NUM>) is fixedly clamped between the first protective bracket (<NUM>) and the second protective bracket (<NUM>),
wherein the protective collar (<NUM>) is fixedly installed in the back cover (<NUM>) and is sleeved and fixed on the outer periphery of the first protective bracket (<NUM>) and the second protective bracket (<NUM>),
and wherein the first protective bracket (<NUM>), the second protective bracket (<NUM>) and the waterproof loudspeaker (<NUM>) are all contained in the back cover (<NUM>); and
wherein the protective collar (<NUM>) is provided with a snapping groove (<NUM>), the first protective bracket (<NUM>) comprising a first snapping ring plate (<NUM>), and the second protective bracket (<NUM>) comprising a second snapping ring plate (<NUM>), wherein the first snapping ring plate (<NUM>) and the second snapping ring plate (<NUM>) abut against each other and are fixedly engaged in the snapping groove (<NUM>).