JP-7854997-B2 - Detectors and mobile devices

Inventors

• 代 郁峰
• 汪 立
• ▲呉▼ 家杰

Assignees

• 華為技術有限公司

Dates

Publication Date

20260507

Application Date

20210923

Priority Date

20201130

Claims (10)

1. A detector comprising one or more lenses, a plurality of collimator holes, and a plurality of infrared sensors arranged in the optical path, The lens is configured to focus peripheral light, and the peripheral light comprises a target area light and another area light. The collimator hole is used to acquire the target area light by screening and block the other area light, and the infrared sensor is configured to receive infrared light within the target area light and to detect temperature based on the infrared light. The detector is A detector further comprising a substrate and a package cover, wherein the package cover and the substrate are connected in a sealed manner to enclose a space for housing the infrared sensor, and if there are multiple lenses, a second light-blocking layer is disposed between the multiple lenses on the package cover, and each of the multiple lenses is in one-to-one correspondence with each of the multiple infrared sensors, and the collimator hole is provided within the second light-blocking layer and within a first light-blocking layer disposed on the side wall of a second groove formed in the package cover in the space for housing the infrared sensor, and the distance between the collimator hole and the lens is adjusted to be greater than the focal length of the lens.
2. The detector according to claim 1, wherein the ratio of the diameter of the collimator hole to the diameter of the Airy disk is 0.5 or more and 3 or less.
3. Further equipped with calibration sensors and controllers, The detector according to claim 1 or 2, wherein the calibration sensor is configured to detect the internal temperature of the detector, and the controller is configured to calibrate the temperature detected by the infrared sensor based on the internal temperature detected by the calibration sensor.
4. A detector according to any one of claims 1 to 3, wherein there are multiple infrared sensors, and the number of lenses is the same as the number of infrared sensors.
5. The detector according to claim 4, wherein the first light-blocking layer for isolating light is positioned between two adjacent lenses.
6. The detector according to any one of claims 1 to 3, wherein, in the case of one lens, there are a plurality of infrared sensors and a plurality of collimator holes, the plurality of collimator holes are in one-to-one correspondence with the plurality of infrared sensors, and the relative distance between the central axis of the collimator hole and the central axis of the corresponding infrared sensor increases as the distance between the central axis of the corresponding infrared sensor and the central axis of the lens increases.
7. The detector according to claim 1, wherein the lens is a protruding structure disposed on the package cover.
8. The detector according to any one of claims 1 to 7, further comprising a housing configured to isolate heat from the external environment, wherein the collimator hole and the infrared sensor are located within the housing.
9. A mobile terminal comprising a circuit board and a detector disposed on the circuit board as described in any one of claims 1 to 8, wherein the circuit board is electrically connected to the infrared sensor of the detector.
10. The mobile terminal according to claim 9, wherein the detector includes a controller, and the controller is electrically connected to the circuit board.

Description

This application relates to the field of imaging technology, and more particularly to detectors and mobile devices. Cross-reference of related applications This application claims priority to Chinese Patent Application No. 202011379887.1, titled "DETECTOR AND MOBILE TERMINAL," filed with the China National Intellectual Property Administration on 30 November 2020, which is incorporated herein by reference in its entirety. Infrared imaging technology was initially used for military purposes, such as missile guidance and night vision surveys. In recent years, infrared imaging technology has gradually expanded into the civilian sector. For example, infrared sensors are used in forehead thermometers for non-contact body temperature measurement. Any object, unless at absolute zero, emits electromagnetic waves. Higher temperatures result in shorter wavelengths. When the temperature is above 3000K, the wavelength of the electromagnetic waves falls within the visible light wavelength range and is visible to the human eye. Body temperature ranges from 35°C to 37°C (300 K ( Kelvin ) ). The wavelength of the emitted electromagnetic waves ranges from 8 μm to 12 μm, which is within the far-infrared range. Therefore, measuring body temperature using an infrared sensor means using that sensor to detect the infrared wavelength range of 8 μm to 12 μm. Currently, widely used infrared thermometers include forehead thermometers and thermal imagers. Forehead thermometers use a thermopile sensor to measure temperature, typically at a short distance of 2 cm. They lack lenses and are low-cost. Thermal imagers are similar to cameras used for taking photographs. They are equipped with precision optical lenses and can capture clear infrared images. Another type of infrared thermometer is security check gate systems. The temperature measurement method in security check gate systems is similar to that of thermal imagers. They typically have two cameras: one for taking photographs under visible light and the other under infrared light. The two photographs, taken under visible and infrared light, are later combined according to AI algorithms and processed using other functions. However, with conventional technology, the detection distance of forehead thermometers is relatively short, and the structure of thermal imagers is relatively complex. As a result, neither forehead thermometers nor thermal imagers can be integrated into thin terminal devices. This application provides a detector and a mobile terminal to implement long-range infrared temperature measurement and to improve the miniaturization of the detector. According to a first embodiment, a detector is provided. The detector is configured to implement temperature detection. The detector mainly comprises a lens, a collimator hole, and an infrared sensor. The lens, collimator hole, and infrared sensor are arranged in the optical path. Light can pass through the lens and collimator hole and then irradiate the infrared sensor. The lens is configured to focus ambient light, and the ambient light includes target area light and other area light. Ambient light can enter the detector through the lens whether or not it is within the area to be detected. The collimator hole is used to acquire target area light by screening and to block other area light. Specifically, the collimator hole is used to screen the incident ambient light, and it is possible that only target area light is irradiated to the infrared sensor. The infrared sensor is configured to receive the target area light and block other area light. In the above technical solution, the focusing function of the lens allows the detector to detect body temperature over relatively long distances, and the target area is selected through the provided collimator hole. This improves detection accuracy. Furthermore, the collimator hole is used as a structure for screening light. This allows for a reduction in the detector's volume, facilitating miniaturization of the detector. In specific implementation solutions, the ratio of the collimator hole diameter to the Airy disk diameter is between 0.5 and 3. This ensures the effectiveness of infrared light screening and improves detection. In certain implementation solutions, the distance between the collimator hole and the lens may be greater than, equal to, or less than the focal length of the lens. Thus, different distances are required to be set based on the detection requirements. In a specific implementation solution, the detector further includes a calibration sensor and a controller. The calibration sensor is configured to detect the internal temperature of the detector. The controller is configured to calibrate the infrared light temperature detected by the infrared sensor based on the detector temperature detected by the calibration sensor. This improves the detection effectiveness of the detector. When infrared sensors and lenses are arranged, they can correspond to each other in differ