The optical camera module is an indispensable part of the vision system of machine. Whether it is accurately focused directly affects the clarity of the photo or image. In daily applications, there is a problem that is difficult to solve in the auto-focus system of photography: out of focus. ZHAOWEI planetary gearbox, stepper motor, fixed bracket, and drive screw are combined to drive the telescopic lens and convert the rotation of stepper motor into linear motion of zoom group and compensation group. Through the programmed control of the stepping motor, the precise displacement control of the zoom group and the compensation group is realized to obtain the imaging effect. This telescopic module for the optical camera is widely used in mobile cameras, vehicle cameras, medical and surveillance cameras.
With the development of intelligent surveillance and the Internet of Things, optical camera modules are widely used in consumer digital products, such as mobile phones, notebook computers, toys, industrial detection, automotive vehicle cameras, and medical equipment. Especially under the impact of intelligent security, intelligent monitoring, and highly automated vehicle components, camera modules for capturing images are widely used. However, when the camera lens cooperates with the chip, there is always the problem of poor imaging effect. Thus, adjusting the focus repeatedly will be needed, which seriously reduces the efficiency.
After optimizing the structure of the mobile phone camera gear module, ZHAOWEI designed the telescopic gear module for optical camera. Through the programmed control of the stepper motor, the precise displacement control of the zoom group and the compensation group can be achieved to obtain a satisfying imaging effect.
The optical lens controller is generally composed of precision metal or plastic parts, lenses, apertures, drive motors, sensors, and other optomechanical components and lens barrels. The camera module includes CSP lens, glass sheet, COB image sensor chip, lens holder, and PCB board located under the lens holder and fixedly connected to the lens holder, stepper motor, pan tilt for the camera, movement controller and step Into the motor driver, etc. We tried to design a motion control platform with a screw rod and a slider, set a glass sheet between the CSP lens and the COB image sensor chip, and install each lens group and stepping motor on this base. The zoom group and compensation group are installed on the slide rail. The screw rod and nut mechanism are driven by a 6mm stepper motor. The rotation of the stepping motor is converted into linear motion of the zoom group and compensation group through the nut which is matched with the screw rod. The incident light entering from the CSP lens is refracted twice through the glass sheet, and then enters the COB image sensor chip, so that the light has a good optical path and direction of propagation inside the module, and the imaging effect is uniform and clear, and it can focus accurately during the focusing process without repeated focusing, thereby improving the efficiency and yield of the camera module.
When the stepping motor rotates, it drives the focusing lens group to move back and forth along the guide rod. Through the programmed control of the stepper motor, the precise displacement control of the zoom group and the compensation group is realized. If you need to improve the accuracy of the control system, you can subdivide the driver. All parameters in this design, such as pitch, step angle, input voltage, speed, and the number of stages of planetary gearbox, can be customized and adjusted as required.
This optical lens mobile telescopic gear module reduces the overall size and produces pure translation movement through the fixed design of the screw rod and the slider, while the non-fixed linear stepper design can provide a longer stroke. The ball bearing design can extend the service life of the linear actuator motor and has a higher load capacity. Besides, achieving linear motion inside the motor eliminates the design cost of putting the gearbox into the system and reduces the number of potential abrasion points. Due to the reduction of external mechanical components, the overall efficiency of the linear stepper gets improved. The linear stepping motor can also use the braking torque of the stacked motor to maintain its linear position without power, thereby reducing the power requirement of the system when it is not running.
The expressive power of light and shadow effects has infinite possibilities. Contrast detection focus continuously repeats the process of “sampling-analyzing-driving-resampling-reanalyzing”, which will inevitably cross the contrast peak and return to the focus lens. Stepping motors and miniature gearboxes can obtain their morphological information without other equipment, and the process of returning can be achieved relatively quickly. In this design, the linear actuator stepper motor can generate translation motion by the simple operation of the stepper motor, which provides a cost-effective and reliable motion solution.