I’m currently trying to reverse engineer the Sony KES-400A OPU. I have a some of the circuitry figured out from sources like Sam W’s LASER FAQ and Edwin Hwu’s publications but I’m currently blocked on the LASER Driver IC. The OPU has all three LASER’s (IR/Red/Violet) in one package driven by a 3 channel driver. The control signals indicate that the Driver is a clocked part, so I’m assuming it uses DAC’s to set the LASER drive currents. The figure below shows the Driver circled in red on the left and a close-up of the FPC on the right.
Does anybody have any information on this Driver IC? A part number would be a great start and a data sheet would be a miracle. Any help would be greatly appreciated.
I found the part number: CXA2691ER. It’s a Sony device. I haven’t been able to find a data sheet. I have traced most of the pins to the OPU input connector. Unfortunately, the part functions are accessed via a Serial Port (probably similar to SPI) which makes parameter programming impossible without a data sheet or a functional drive to capture input. The PHR-803T uses static control lines which are much easier to manipulate, however it is currently very difficult to find a supplier with stock.
This project is tough given all the proprietary info. Please keep us updated on your project. I am also working on this exact same issue OPU maybe less further along . Maybe we can share resources if we find any.
How are you guys focusing the laser? I can get a FE signal but it stays around 4.9 volts no matter where I moved the lens. Is there a certain pattern I need to do to get the signaling to start? Like move it up and down fast to activate the signaling?
Hello, If this thread is still alive, sorry fora stupid question, I’ve build the Gauidilabs OpenLaserScanningMicroscope, but can someone help me understand why the large mosfet is there, I dont see what it is doing, the drain is connected to a I_LASER but this signal is not connected anywhere else. Sorry agan for a stupid question and thank you for any response
While compiling the DVD pick up based applications, I come across various commercial products that started with optical pick-ups are use them as is in their products. Below image captures these:
So, I’m a virologist that does a lot of microscopy. Somehow I managed to get 3 old microscopes for very little money where optics are nice and upgradable to better cameras etc.
Now, I am building XY stages for all of them by 3d printing.
Something that is always slow in imaging, even in my Tie2 from nikon is the Z-stacks. Piezzo stages are always >10k.
Now, my question is, w I basically want to use the voice coil to make a 3d printed stage go up and down with the current.
Few questions if you know:
how much force can they hold
Would a CD be the same speed as a bluray?
how responsive are the voice coils from these optical units?
How hard is it to have a good resolution and stability (50nm for example)?
And, can I use any of this as a encoder for position?
The VCM might be a bit weak if you like to carry something heavy (>50g). The resolution could be 50nm…depends on the resolution of the supply voltage/current. You need at lease 14 to 16 bits DAC to drive the VCM. It needs a bit skill to integrate encoder to the VCM…
Thanks for the link! the XY will be covered by a linear actuator, I won’t need much speed for XY. Z is what I have to speed up a bit as of now.
I’ll look at your paper to see if I can simply add Z to it. it’s an inverted microscope, so, I need to do it via translation stage or have a hole in the middle.
I might contact you formally from my university email! I hope that’s okay.
