CN-116567391-B - Three-dimensional sensor

Abstract

The present application relates to a camera module having an image sensor and a three-dimensional sensor. The camera module includes an image sensor, a three-dimensional (3D) sensor, a preprocessor, and an actuator controller. The pre-processor may be adapted to receive image information from the image sensor, generate an autofocus control signal based on the image information, and provide the autofocus control signal to the actuator controller. The actuator controller may be adapted to receive the autofocus control signal, generate an actuator drive signal based on the autofocus control signal, and provide the actuator drive signal to the 3D sensor. The 3D sensor may be adapted to adjust a field of view (FOV) based on the actuator drive signal.

Inventors

• YIN SHENGXUAN

Assignees

• 爱思开海力士有限公司

Dates

Publication Date

20260508

Application Date

20201010

Priority Date

20200305

Claims (8)

1. 1. A three-dimensional sensor included in a mobile camera module having a laser emission angle adjustment function based on an autofocus control signal of an image sensor included in the mobile camera module according to a distance between the mobile camera module and an object, the three-dimensional sensor comprising: a light source disposed on the substrate, wherein the light source is configured to emit laser light; a diffuser disposed over the light source, wherein the diffuser is configured to emit laser light from the light source at different angles, and An actuator selectively positioning the diffuser, Wherein the actuator comprises: a housing including a driving coil, and A carrier comprising a magnet and configured to support and move the diffuser, Wherein the actuator moves the diffuser to one of a plurality of discrete positions in response to the autofocus control signal.
2. 2. The three-dimensional sensor of claim 1, wherein the carrier is configured to move the diffuser to adjust a distance between the light source and the diffuser by at least three field of view levels.
3. 3. The three-dimensional sensor of claim 1, wherein the housing encloses the light source, the diffuser, and the carrier.
4. 4. The three-dimensional sensor of claim 1, wherein the diffuser is spaced from the light source by the carrier by various distances.
5. 5. The three-dimensional sensor of claim 1, wherein the substrate comprises a printed circuit board.
6. 6. The three-dimensional sensor of claim 1, wherein the light source comprises a semiconductor laser diode.
7. 7. The three-dimensional sensor of claim 1, wherein the drive coil comprises a bottom drive coil configured to pull the carrier to a low position and a top drive coil configured to pull the carrier to a high position.
8. 8. The three-dimensional sensor of claim 1, wherein the diffuser is a single layer and has a fixed laser emission angle.

Description

Three-dimensional sensor The application is a divisional application of Chinese patent application with the application number 202011078311.1 and the name of ' camera module with image sensor and three-dimensional sensor ' which is submitted to the national intellectual property office of the people's republic of China 10 in 10 months of 2020. Technical Field Various embodiments of the present disclosure generally relate to a camera module having an image sensor and a three-dimensional sensor and a camera system including the same. Background Recently, portable camera modules such as mobile devices have achieved more stereoscopic images by additionally introducing three-dimensional (3D) sensors. A time of flight (ToF) sensor has received attention as a 3D sensor. The ToF sensor emits an infrared laser light toward an object, receives a laser beam reflected from the object, and measures a time difference therebetween to obtain 3D information of the object. The maximum effective distance of 3D information that a ToF sensor can sense depends on the laser power. For example, the higher the laser power, the more accurately the ToF sensor can sense 3D information of objects located at a far distance. However, the laser power of the 3D sensor used in particular in mobile devices cannot be sufficiently increased due to limitations of power consumption (i.e., performance and eye safety of the battery). When the laser emission angle of the ToF sensor is reduced to increase the laser power per unit area, the illumination range (FOI, field of illumination) is narrowed, and thus the effective field of view (FOV) is also narrowed. In this case, the closely located object and the larger object are out of the FOI or FOV range, and thus the entire image cannot be obtained. In contrast, when the laser emission angle of the ToF sensor is increased in order to secure a wide effective FOV, it is difficult to obtain effective 3D information because the laser power per unit area is reduced (i.e., the noise component is increased). Disclosure of Invention Various embodiments of the present disclosure are directed to a three-dimensional sensor in which a laser emission angle is adjusted according to a distance between a camera module and an object. Various embodiments of the present disclosure are directed to a camera module having an auto-focusing function and a laser emission angle adjustment function according to a distance between the camera module and an object. Various embodiments of the present disclosure are directed to a camera module and a camera system including a three-dimensional (3D) sensor having a laser emission angle adjustment function based on an autofocus control signal of an image sensor according to a distance between the camera module and an object. These technical features of the present disclosure are not limited to the above-described embodiments, and other technical features not described herein may be understood from the following detailed description by those skilled in the art to which the present disclosure pertains. According to one embodiment, a camera module may include a first sensor, a second sensor, a pre-processor, and an actuator controller. The pre-processor may be adapted to receive image information from the first sensor, generate an autofocus control signal based on the image information, and provide the autofocus control signal to the actuator controller. The actuator controller may be adapted to receive the autofocus control signal, generate an actuator drive signal based on the autofocus control signal, and provide the actuator drive signal to the second sensor. The second sensor may be adapted to adjust a field of view (FOV) based on the actuator drive signal. The second sensor may include a light source disposed on the substrate, a diffuser disposed on the light source, and an actuator. The actuator may be adapted to adjust the distance between the light source and the diffuser based on the actuator drive signal. The actuator may include a housing and a carrier. The carrier may support and move the diffuser. The housing may enclose the light source, the diffuser and the carrier. The housing may include a drive coil. The carrier may comprise a magnet. The number of driving coils may be equal to or greater than three. The diffuser may be a single layer and have a fixed laser emission angle. According to one embodiment, a camera system may include an image sensor configured to capture image information, a three-dimensional (3D) sensor configured to obtain 3D information, a pre-processor configured to generate an autofocus control signal based on the image information received from the image sensor, an actuator controller configured to generate an actuator drive signal based on the autofocus control signal received from the pre-processor, an image signal processor configured to generate image data based on the image information received from the image sensor and the 3D information receive