First of all, we need to understand that the telescopic structure is not a "disruptive innovation". By definition, this mechanical structure should not be found in modern smartphones, but is a special solution to achieve a more zero-border full-screen. But that doesn't stop it from being innovative or imaginative, and users are excited and happy to pay for such a refreshing product.
In fact, the retractable front lens is a very clever design. Because the frequency and length of time users use front-facing shots is not particularly high. It would be more "economical" to find a way to hide the camera and only "reveal" it when needed. So cell phone engineers used a miniature stepper motor to achieve the solution of lifting the front lens.
You may think it's just one up and one down is fun, but behind the scenes engineers need to consider a whole set of logic processes, including micro-stepping motors, independent driver ICs, precision control algorithms, and quality testing to verify the reliability and durability of this solution before formal mass production.
The core mechanical transmission structure in this, consisting of stepper motor, gearbox and transmission filament three parts.
Each lift, rely on the stepper motor twist to generate force, through the precision reduction box to amplify the torque, drive the screw rotation, providing enough transmission force to drive the front camera to complete tens of thousands of lifting and landing recovery action.
The mechanical drive is not an innovative engineering structure, widely used in other industrial fields, but how to put such a mechanism into a smartphone with a thickness of no more than 10mm is a difficult problem for engineers to overcome.
In itself is a precision electronic products, the internal space is very limited, this need to drive and buffer the mechanical structure must occupy a lot of space, so the 5mm micro stepper motor on the line on the big use!
With that said, a little explanation of the principle of the stepper motor. It is an open-loop control motor that converts pulse signals into angular or linear displacements, and is commonly used in the execution units of modern digital program control systems. Its characteristic advantage is "precise control of pulse signal", we can control the frequency and number of pulses to achieve precise speed regulation and positioning.
But not with the lift module is complete, how to place it reasonably on the top of the body is also a challenge. This means that the upper part of the main PCB will be greatly affected, which further changes the internal structure of the lower layer.
With everything ready on the design, the next step is the test of QA engineering. The first thing engineers need to ensure is a long enough service life, at least to completely cover the probability of the replacement cycle. After the big data research lift cycle was finally set at 50,000 times, assuming that the user calls 50 times a day selfie scene, basically can guarantee three years of normal use cycle. This is also the reason for choosing to use 5mm micro stepper motor, stepper motor stability and long life and precise control of the superiority of the best play here.
This is a 5mm linear stepper motor with a screw pitch of 0.4mm, with 6 starts, a screw lead of 2.4mm, and an effective motor stroke of about 8mm, and a slider that moves up and down according to the driver settings. The motor is very small and can be used for high precision electrical and electronic equipment.
Here are the basic parameters of this motor, if you want to communicate and cooperate with us, please feel free to contact us.
| Model No. | SM5-PG-Linear |
| Motor type | Linear stepper motor with gear box |
| Motor diameter | 5mm |
| Rated voltage | 5 V DC |
| Gearbox ratio | 20.5 : 1 |
| Step Angle | 18°/STEP |
| Lead screw pitch | 0.4mm |
| Lead screw starts | 6 starts |
| Step angle | 22.5° |
| Stroke | About 8mm |
| Thrust | 250 g (5V/2400PPS) |
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Changzhou Vic-tech Motor Technology Co., Ltd. is a professional research and production organization focusing on motor research and development, overall solutions for motor applications, and processing and production of motor products. Ltd. has been specialized in manufacturing micro motors and accessories since 2011. Our main products: miniature stepper motors, gear motors, geared motors, underwater thrusters and motor drivers and controllers.
Our team has over 20 years of experience in designing, developing and manufacturing micro-motors, and can develop products and assist design customers according to special needs! At present, we mainly sell to customers in hundreds of countries in Asia, North America and Europe, such as USA, UK, Korea, Germany, Canada, Spain, etc. Our "integrity and reliability, quality-oriented" business philosophy, "customer first" value norms advocate performance-oriented innovation, collaboration, efficient spirit of enterprise, to establish a "build and share "The ultimate goal is to create maximum value for our customers.
Post time: Feb-07-2023