Who can specifically talk about what Canon's USM technology looks like?

USM ultrasonic motor) The earliest USM used in cameras was Canon EF lens series.

1987 Canon introduced the first lens equipped with annular USM. It is precisely because Canon's USM ultrasonic motor technology has left its rival Nikon far behind.

Structure and principle of ring ultrasonic motor

Traditional motors work on the basis of electromagnetic principle, converting electromagnetic energy into rotational energy. On the other hand, the working principle of USM is a brand-new principle of converting ultrasonic vibration energy into rotational energy.

The basic characteristics of USM:

1, with low speed and large torque output characteristics;

2, the braking torque is large;

3, the structure is simple;

4. The controllability of motor starting and braking is very good;

5, the rotating sound is very small, almost silent.

In addition to the above basic characteristics, Canon ring ultrasonic motor has its own characteristics:

6. High efficiency and low power consumption;

7. The ring motor can be perfectly combined with the mirror body;

8. Low speed, especially suitable for AF driving of lens;

9. The rotating speed can be arbitrarily controlled within the range of 0.2 rpm to 80 rpm;

10, which can realize electronic MF with adjustable sensitivity;

Canon's ultrasonic motor technology is definitely the king of speed in the field of 135 professional SLR. All photographers who have used flagship SLR such as Nikon Canon at the same time have personal experience. More than 80% of professional journalists and photographers use Canon.

Note: The landlord should pay attention to the purchase of Canon USM lens. Generally, L lens and some high-end non-L lenses are ring ultrasonic motors, and the low-end ones are also ultrasonic motors, but the working principle and speed cannot be compared with the former. This is also Canon's marketing strategy.