Canon successfully developed a camera lens capable of self-cleaning dust

Canon engineers developed a camera lens that draws air in, rotates the airflow in the body, and eventually pushes them out of the camera.

As explained by Canon, the above method can help eliminate the dark spots in the image . The lens draws air through channels around the outer edge of the device. This air is fed back to the camera's mirror box when the mirror is raised and the sensor is turned on.

Air and dust are then directed through the inside of the lens until it exits the front of the lens through channels surrounding the front and the rim of the camera lens. Canon Company has filed a patent application for this solution.

According to experts, the sensor cleaning function in many modern cameras often uses sensor vibration to cause dust to fall out. Canon's idea will help users have an additional useful option to remove dust without the need for additional equipment.

However, according to experts, this is just an internal idea of ​​Canon and most likely users will never experience this invention in reality.

Camera lens model that Canon has just developed.

It is known that the general principle of the dust protection system for sensors is to use two main ways: passive dust protection , minimizing the ingress of dust from outside and actively preventing dust by letting sensors "self." drooping " dust. However, each manufacturer has different ways of handling.

Previously, Olympus was the first company to introduce a dust-proof sensor system into DSLRs with its "E" series and impressive ads such as being able to replace lenses in the desert sand without having to care about it. dust sticks to the sensor.

Once upon a time there were exclusive advertisements to promote the Olympus E-1, the first DSLR camera to incorporate this. Since that time, ultrasonic filters have become a must-have standard for Olympus 4: 3 DSLRs.

The solution to remove dust from Olympus is to use a thin metal foil in front of the vibration sensor with ultrasonic frequency (greater than 20 kHz) to trigger dust to fly out. Dust falling off the sensor will be stuck on a strip covered with adhesive on the bottom in front of the sensor to prevent these pieces from returning. This procedure is repeated each time the camera is turned on or this feature is selected from the command directory in the camera. Adhesive pads will be replaced after a few years to ensure the system's performance.

Olympus "monopolized" the dust-proof system for sensors for DSLRs as of the launch of the Sony Alpha A100 in June 2006. Sony uses technology that directly vibrates the sensor to "shake" dust off its surface. This technology was originally developed by Konica Minolta to prevent image stabilization and has been used on A2, Maxxum 5D, 7D .

The sensor itself, not a thin piece of metal, will vibrate at high amplitudes with low frequencies of about 100 Hz to "shake off" the dust. The surface of the sensor is also coated with special Sony Indi with the purpose of reducing static electricity so that dust particles are easier to fall out of the sensor when it vibrates.

Canon also participated in this competition with the first product with the anti-shake system, EOS-400D . According to the features described, Canon's dust-proof technology is similar to that of Olympus.

Canon set up one more filter before the ordinary infrared filter and vibrated at high frequency to shake off the surface of the sensor. However, Canon did not stop here. It also has an automatic solution by software called "dust map". Dust will be marked with a photograph to compare and record their position in the shooting parameters. These parameters will be saved in each image (including RAW images) and processed with Canon software to eliminate the "stubborn elements".

Pentax K10D uses almost Sony technology because it uses the principle of sensor vibration to clean them. With four permanent coils and magnets to create the sensor's anti-vibration system and part of their operation is used for the purpose of reducing the dust of the sensor.

In addition, the surface of the filter placed before the sensor in the Pentax machine is coated with a special fluorine layer that prevents dirt from sticking back on the surface. Every time you turn on the device or access the feature from the folder, the sensor vibrates to shake off the dust and dust that is stuck by a non-stick strip. The Samsung GX-10 product is identical to the Pentax K-10D in both features and appearance, so it can be confirmed that its anti-vibration technology is also completely similar.

Sigma's solution seems to be much simpler with a special filter that prevents the front of the sensor. This filter is sealed in the background to ensure that the outside dust does not leak and stick to the sensor. Dust from the outside will be blocked, some may stick on this filter, but with blur effect out of focus (out focus) so these dust will not be present in the image. Because the shield is close to the lens mount, it is also easier to clean and clean.

More recently, Panasonic has entered the fray in the digital SLR market with the DMC-L1 with Olympus acquired dust filter system.