FIELD OF THE INVENTION

The present disclosure relates to a gas detecting module, and more particularly to an extremely thin gas detecting module.

BACKGROUND OF THE INVENTION

Suspended particles are solid particles or droplets contained in the air. Since the sizes of the suspended particles are really small, the suspended particles may enter the lungs of human body through the nasal hair in the nasal cavity easily, thus causing inflammation in the lungs, asthma or cardiovascular disease. If other pollutants are attached to the suspended particles, it will further increase the harm to the respiratory system. In recent years, the problem of air pollution is getting worse. In particular, the concentration of particle matters (e.g., PM2.5) is often too high. Therefore, the monitoring to the concentration of the gas suspended particles is taken seriously. However, the gas flows unstably due to variable wind direction and air volume, and the general gas-quality monitoring station is located in a fixed place. Under this circumstance, it is impossible for people to check the concentration of suspended particles in current environment. Thus, a miniature and portable gas detecting module is needed for allowing the user to check the concentration of surrounding suspended particles anytime and anywhere.

Please refer toFIG. 1, which shows a gas detecting module disclosed in Taiwan Patent Application No. 107130404. In the gas detecting module1A according to the prior art, it is difficult to reduce the volume of the housing11A due to the limitations of the size of the gas-guiding component12A and the internal gas flow channel. A gas-guiding path is shown by the arrows inFIG. 1. After gas is introduced from the inlet in the upper level and then flows downwardly to the lower level, a detection is performed. Then, the detected gas is transported through the micro pump, flows back to the upper level and is discharged through the outlet finally. In the structure of the conventional gas-guiding channel, the gas-guiding path is designed in multiple layers, which is complex and thicker. It is difficult to reduce the entire thickness of the gas detecting module, and it is more difficult to implement the conventional gas detecting module on a miniaturized mobile device or other portable electronic devices. Therefore, how to make the gas detection module thinner and lighter is a problem that urgently needs to be solved.

SUMMARY OF THE INVENTION

An object of the present disclosure provides a gas detecting module. With a driving circuit board attached to a second surface of a base, and a first surface of the base covered by an outer cover, an inlet path is defined in a gas-inlet groove, and an outlet path is defined in the gas-outlet groove. In addition, the laser component is arranged on the driving circuit board, the driving circuit board directly covers the base, and the position of the piezoelectric actuator is separated from the position of the laser component through the structure of the base. It benefits to reduce the thickness of the gas detecting module greatly.

In accordance with an aspect of the present disclosure, a gas detecting module is provided. The gas detecting module includes a base, a piezoelectric actuator, a driving circuit board, a laser component, a particulate sensor and an outer cover. The base includes a first substrate, a second surface, a laser loading region, a gas-inlet groove, a gas-guiding component loading region and a gas-outlet groove. The second surface is opposite to the first surface. The laser loading region is hollowed out from the first surface to the second surface. The gas-inlet groove is concavely formed from the second surface and disposed adjacent to the laser loading region. The gas-inlet groove includes a gas-inlet and two lateral walls, the gas-inlet is in fluid communication with an environment outside the base, and a transparent window is opened on the lateral wall and is in communication with the laser loading region. The gas-guiding-component loading region is concavely formed from the second surface and in communication with the gas-inlet groove. A ventilation hole penetrates a bottom surface of the gas-guiding-component loading region, and four positioning protrusions are disposed at four corners of the gas-guiding-component loading region, respectively. The gas-outlet groove is concavely formed from the first surface, spatially corresponds to the bottom surface of the gas-guiding-component loading region, and is hollowed out from the first surface to the second surface in a region where the first surface is not aligned with the gas-guiding-component loading region. The gas-outlet groove is in communication with the ventilation hole, and a gas-outlet is disposed in the gas-outlet groove and in communication with the environment outside the base. The piezoelectric actuator is accommodated in the gas-guiding-component loading region. The driving circuit board covers and is attached to the second surface of the base. The laser component is positioned and disposed on the driving circuit board, electrically connected to the driving circuit board, and accommodated in the laser loading region. A light beam path emitted from the laser component passes through the transparent window and extends in a direction perpendicular to the gas-inlet groove, thereby forming an orthogonal direction with the gas-inlet groove. The particulate sensor is positioned and disposed on the driving circuit board, electrically connected to the driving circuit board, and disposed at an orthogonal position where the gas-inlet groove intersects the light beam path of the laser component in the orthogonal direction, so that suspended particles passing through the gas-inlet groove and irradiated by a projecting light beam emitted from the laser component are detected. The outer cover covers the first surface of the base and includes a side plate. The side plate has an inlet opening spatially corresponding to the gas-inlet and an outlet opening spatially corresponding to the gas-outlet, respectively. The base, the piezoelectric actuator, the driving circuit board, the laser component, the particulate sensor and the outer cover are produced by tiny materials to form a modular structure, and the modular structure has a length, a width and a thickness. The first surface of the base is covered with the outer cover, and the second surface of the base is covered with the driving circuit board, so that an inlet path is collaboratively defined by the gas-inlet groove and the driving circuit board, and an outlet path is collaboratively defined by the gas-outlet groove, the outer cover and the driving circuit board. The gas is inhaled from the environment outside base by the piezoelectric actuator, transported into the inlet path through the inlet opening, and passes through the particulate sensor to detect a concentration of the suspended particles contained in the gas, and the gas transported through the piezoelectric actuator is transported out of the outlet path through the ventilation hole and then discharged through the outlet opening.

The above contents of the present disclosure will become more readily apparent to those ordinarily skilled in the art after reviewing the following detailed description and accompanying drawings, in which:

