Recently, the overseas lensrentals website disassembled Canon EOS R5. This paper is a translation. < / P > < p > before disassembling Canon EOS R5, we can first discuss one thing, that is, the heat dissipation of Canon R5. As for the serious heating of 8K video and 4K supersampling video recorded by Canon EOS R5, we can tell you the reason without any disassembly: “R5 camera is too small, and it is fully sealed, so its heat dissipation capacity is very limited!” < / P > < p > lensrentals is not a product engineer, but through today’s disassembly of R5 micro single camera, lensrentals will review the products based on their own experience and show you some interesting internal structures of Canon R5. < / P > < p > for example, when lensrentals disassembled Canon EOS r two years ago, it was found that there was a space inside the camera that was not used, and the size of this space was roughly the size of the five axis anti shake parts of the fuselage Canon installed the five axis anti shake function on R5 and R6, which shows that Canon had considered the design of five axis anti shake when designing EOS R. < / P > < p > remove the battery cover and the camera looks very similar to other Canon cameras. The interface shown here is the connector for the wft-r10 wireless transmitter, which is cool: it has the function of two battery handles, and provides Ethernet and wireless connection, and can connect up to 10 cameras to the server. < / P > < p > in every camera, the battery cover is a weak area prone to leakage. After that, the rim of R5 is designed to solve the problem of excellent sealing. < / P > < p > tear off the skin of the camera body. For amateur players, the key to tear off the skin is to keep the double-sided adhesive tape on it as far as possible, so as to paste it again. The skin feel of Canon EOS R5 is slightly different from other Canon cameras, but the skin thickness and flexibility are equivalent. < / P > < p > in the previous Canon cameras, we often see rubber sealing rings between various parts, which are used to seal the camera body. Now Canon’s various parts are directly integrated with soft rubber gasket at the joint, which is much larger than the previous independent rubber seal ring, and provides better sealing effect. < / P > < p > some small openings also adopt the same sealing measures. For example, the small hole shown in the figure is surrounded by soft sealing gasket materials. Through this design, the joint position of battery compartment is sealed. < / P > < p > in addition, please note that HDMI interface and digital output interface of Canon EOS R5 are all located on the main PCB circuit board. When using, be sure to fix the cable. In case of accidental pulling, you may face the huge loss of replacing the motherboard! < / P > < p > next is the I / O surface, and we can see again that the large rubber lip seals the whole part. Also, note that both the HDMI and digital output ports are part of the main PCB, so secure the cable. Loosening these ports will be an expensive main PCB replacement. < / P > < p > when we remove the side panel, we can feel the obvious “suction”, which is not felt in the disassembly of other camera products. So, with regard to the sealing design of Canon EOS R5, we think it is better than any camera we have ever contacted before! < / P > < p > for the part of fuselage design, lensrentals believes that Canon EOS R5 has excellent sealing performance, which can be used in harsh weather such as dust, rain and snow. < p > < p > Canon EOS R5 has more backplane dials than EOS R, but the LCD screen layout looks exactly the same as EOS R. There is nothing new in this part, except that the LCD screen side cable seems to be replaced by new materials. < / P > < p > as shown in the figure above, when the back part of Canon R5 passed the inspection, the QC personnel of Canon company marked it, and the dismantling personnel of lensrentals decided to paint it again < / P > < p > there is a green sub circuit board which seems to be a separate power board, because some wires are connected from the battery compartment. The larger square chip is tph8r903nl voltage converter. The big white chip on the top left of the blackboard is Canon WiFi chip, and wifi antenna is connected to the top of it. < / P > < p > the DC-DC converter board that covers the top of the processor is bound to generate waste heat. And the amount of heat depends on the load, generally 10% ~ 20% of the total power. < / P > < p > compared with Canon EOS R, there is no big difference in the button and turntable of the top cover. However, the link between the top cover and the main panel is integrated into one interface. In addition, the top cover of R5 camera still has some space. < / P > < p > in any case, the top component will fall off when the viewfinder is not turned on. With the exception of the other rtop components, there is no big difference in the number of buttons and turntables. Unless they put all the connections between the top and the motherboard in one connector; usually, there are several. Compared to the main part of the camera’s fuselage, there is still some air. < / P > < p > compared with other parts of the camera, the sealing design of the top cover is not the same. Instead, it uses Canon’s traditional “embedded” seal design instead. < / P > < p > lensrentals personnel speculated that the camera’s top cover uses a conventional “embedded” seal design, mainly to provide rain protection. Canon, on the other hand, uses a large number of integrated seal rings in the bottom area of the R5 camera, considering that the camera may be partially immersed in water. However, Canon EOS R5 does not have much sealing design on the lens bayonet area. If the weatherproof function has weak points, lensrentals estimates that the lens bayonet area is the weak point. The top cover seal of Canon EOS R5 is poor, but this design is conducive to heat dissipation. The bottom of Canon EOS R5 is covered by a large number of insulating and sealed rubber materials, which can effectively prevent water immersion, but it is a disadvantage for heat dissipation. < / P > < p > but the aluminum plate under the R5 power supply board is very “manly”, with a thickness of 0.98mm. Therefore, lensrentals speculates that its function is more to help heat dissipation. < / P > < p > this aluminum plate connects two thermal pads at the top and bottom of the camera, which can transfer the internal heat to the top and bottom of the camera. < / P > < p > Please note that before removing this board, be sure to remove the aluminum plates above the processor as they are connected together. The bottom plate is fixed to the camera by screws rather than welding, so it is easy to replace. < / P > < p > the battery compartment switch is a very small and fragile switch, which is directly welded to the motherboard and is only fixed by solder. Once the impact of external forces, it may be finished, and repair it needs to replace the entire motherboard! Therefore, Canon engineer’s logic is: the heat of SDRAM chip is transferred to the processor, the bottom plate and the top cover through the small aluminum plate, while the processor receives part of the heat from the SDRAM, and transmits it to the large aluminum plate through the heat dissipation gasket on the back. < / P > < p > removing it will display another heat sink under the CPU. As a result, Canon seems to be transferring heat from the SDRAM chip to one radiator and from the CPU to another. To a certain extent. The two memory card slots of < / P > < p > R5 are integrated on the main circuit board, and the ejecting mechanism of cfexpress memory card is realized through this metal shell. From the picture, we can see that the internal socket of cfexpress is very strong, which is much better than the old CF socket. < / P > < p > this is the back of the CMOS image sensor / Ibis component of Canon R5 camera. The complicated wiring is the connection between CMOS image sensor and shutter. However, lensrentals indicated that Canon used spring tension screw to fix the sensor in EOS R, while in EOS R5, Canon used screw and gasket. < / P > < p > this is true of every camera lensrentals has removed with a body shake proof design, but lensrentals still believes that the design with spring tension screws is better. < / P > < p > because the mechanical shutter assembly of the camera is very precise, lensrentals does not intend to disassemble the shutter assembly. If you accidentally screw up the gear of the shutter assembly, you still need industrial software to calibrate the shutter time after assembly. This is quite complicated and troublesome! < p > < p > in the discussion on the poor heat dissipation of Canon R5, few people discuss the thermal conductivity of R5 fuselage, while lensrentals thinks that it looks like a chicken with weak thermal conductivity Away from the blinds, the chassis is actually just the lens holder, battery box and some connection traces. Did you know that I found something interesting in all the jumping conclusions about heat inside Canon R5? No one has tested the thermal conductivity of the chassis. < / P > < p > to measure the glass thickness of Canon R5 image sensor, the sensor needs to be completely decomposed. But it’s easy to break the CMOS sensor, so lensrentals plans to use the “corpse” for anatomic measurements when one of the R5 is finished. At present, lensrentals estimates that the total thickness of Canon R5 low-pass filter, infrared cut-off filter and front protective glass is about 2mm. < / P > < p > lensrentals was curious about how the Ibis unit supported the CMOS image sensor. When they disassembled it, they saw some slits. Through the slits, they saw that the sensor was fixed on the bottom plate of Ibis module with several plastic screws. There is also a screw tab to secure the cover. < / P > < p > interestingly, Canon’s CMOS sensor components are directly and smoothly attached to the Ibis base plate, and there is no “lug structure” for mounting screws. < / P > < p > on the body anti shake assembly, we can see the permanent magnet, but the electromagnet used to drive Ibis displacement is not visible in the picture because it is blocked. The interior space of Canon R5 camera is almost full due to its anti shake design and more powerful chipset. The parts are complex and there is little space left. 2 / 3 of the area under the camera adopts a new “integrated sealing gasket” design, which has excellent sealing performance. < / P > < p > 2. Canon R5’s body anti shake components are very compact and well-designed. However, the sensor and Ibis base plate are not fixed by “lug structure” + screws, which may be a disadvantage. Of course, Canon’s body anti shake technology is a new thing, we need about a year to verify its reliability. Canon R5 has two independent heat sinks, one under the power board and the other between the main circuit board and the CMOS sensor. The heat sink is equipped with thermal pad, which can conduct heat from SDRAM and processor. Some of the heat will be transferred to the base metal plate connected to the tripod, which may provide some heat storage capacity. However, due to the excessive sealing and compact design of Canon R5, lensrentals thinks that the modification with heat dissipation paste is meaningless because the heat inside the camera lacks effective communication with the outside world. < p > < p > the authors of this article are Roger KaKaLa and Aaron Klose of lensrentals website. At the end of this article, the mouse brother expresses his thanks to these two big men for their hard work in dismantling the machine, which let us see many unknown secrets of Canon R5!