Blu ray drive CD driver Flex PCB application

Blu ray drive CD driver Flex PCB application
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The photo of the top of the HD-DVD sled shows the dual objective lenses, both mounted on the same actuator assembly. The upper lens is for the CD and DVD and the lower lens is for the HD. Note that the marking on the PCB actually says "BD/HDP". I'm calling it HD-DVD because that's what I was told by the person who sent it to me (Sam) but it may indeed be designed for both BD and HD-DVD operation, probably made by LG. Unfortunately, the model of the equipment it was removed from is not known.

In the photo of the bottom of the HD-DVD sled, the path for the 405 nm laser is the lower path and travels right to left. Note the zoom lens assembly! The upper path traveling left to right is 660/780 nm (note there is no beamsplitter evident here, just a single collimating lens and turning mirror! This is because the Laser diodes, beamsplitter, and photodiodes, are integrated into one can! This is fairly common in modern DVD/CD players, and according to some of the patents have seen this is how the combined 405/660/780 nm diode will most likely end up!)

What's this?
This is used to regulate the current flowing through the diode.

Do I need this?
YES! You must NEVER connect the LD directly to the power supply because it WILL die!

Can I just use a resistor?
Theoretically yes, but the current will not stay constant as the components heat up and the battery voltage decreases and this can shorten the diode's life.

But kipkay didn't use any driver...
Why do you think we have to deal with n00bs crying about their dead Laser Burning Flashlight Hack? (Just read the text above...)

UPDATE
A lot of people ask me about the diode's forward voltage stuff. This is a constant current driver. That means, it will adjust it's output voltage in order to keep the optput current fixed. So, it doesn't matter if you connect a red (2.2V), IR (2V), 405nm or a 445nm (>4V), as long as your power supply's voltage is above the diode's voltage + 1.5V, your laser will be running fine at the set current.
Also, the answer to question: "What voltage is diode XY?" can't be answered directly. Every diode's forward voltage (Vf) depends on her type and on the current. For example, a LPC-815 has Vf from 1.8V up to about 3.2V, as the current increases. Every diode has a PIV plot, which describes it's dependancy between the current, optical power and voltage. Google your diode's PIV plot, such as "LPC-815 PIV" or "22x red PIV" and so on.

In computing, an optical disc drive (ODD) is a disk drive that uses laser light or electromagnetic waves within or near the visible light spectrum as part of the process of reading or writing data to or from optical discs. Some drives can only read from certain discs, but recent drives can both read and record, also called burners or writers. Compact discs, DVDs, and Blu-ray discs are common types of optical media which can be read and recorded by such drives. Optical disc drives that are no longer in production include CD-ROM drive, CD writer drive, combo (CD-RW/DVD-ROM) drive, and DVD writer drive supporting certain recordable and rewritable DVD formats (such as DVD-R(W) only, DVD+R(W) only, DVD-RAM only, and all DVD formats except DVD-R DL). As of 2015, DVD writer drive supporting all existing recordable and rewritable DVD formats is the most common for desktop PCs and laptops. There are also the DVD-ROM drive, BD-ROM drive, Blu-ray Disc combo (BD-ROM/DVD±RW/CD-RW) drive, and Blu-ray Disc writer drive.

TwinTeeth
So we started again from scratch with new designing criteria: reduce vibrations and resonances. To avoid them we used Acme screws instead of belts and we decided to move the PCB instead the laser. DiyouPCB is based on a traditional cartesian robot design using timing belts so this time we will try something different: an inverted delta robot.

At the same time we wanted a tool very easy-to-use because make PCBs at home is a tedious task. The complete process includes managing diverse techniques: printing, etching, drilling, dispensing, placing components, soldering, etc.

This is the ideal environment for a multi-functional robot. We though that interchange the tools had to be very easy and fast. Otherwise nobody will want to use it frequently. Also we though in the future: there are people around the world researching about printing circuits with conductive ink, filament, graphene, etc. This is the next evolution of electronics: 3D printing circuits. So, we also added a 3D extruder and the possibility to extend the robot with more toolheads.

TwinTeeth was born: a multi-functional robot to make PCBs at home. It also uses the PHR-803T but with an improved electronic driver.

The PHR-803T
The PHR-803T incorporates a UV laser diode on the 405nm wavelength. The spectrum and power is more than enough to sensitize UV film even resin, but we couldn’t find any technical information about it. We sent several e-mails to the manufacturer without success. After searching all the web we decided to open and analyze some of them.

The PHR-803T is a masterpiece of engineering manufactured by Toshiba. Nowadays, optical storage technology has been largely superseded by other technologies like flash memories. In fact Toshiba has discontinued HD-DVD readers/writers so there are in the market many spare parts at low prices.

The pickup incorporates some interesting components:

Three laser diodes: UV 405nm (HD-DVD), Red 650nm (DVD) and IR 780nm (CD)
A focus lens and coil servos for auto-focus, tracking and correction angle.
A photodiode array which receive the RF signal and help focusing on.
We learned a lot about lasers at the page of Sam (Sam's Laser FAQ ) and got the little information available about the PHR-803T. Sam include in his web a very interesting photo of a exploded view that helped us to identify its components.

In an aspect, there is provided a photodetector integrated circuit (PDIC) for an optical pickup, the PDIC including a light-receiving portion comprising a main light-receiving part and sub light-receiving parts respectively disposed on oppositing sides of the main light-receiving part, each of the main light-receiving part and the sub light-receiving parts comprising a plurality of sectional light-receiving areas, and a plurality of lands which output a detection signal of light detected by each of the sectional light-receiving areas of the main light-receiving part and the sub light-receiving parts, wherein the plurality of lands are arranged to form two lateral lines in a height direction of the optical pickup.

The PDIC may further comprise a printed circuit board (PCB) which is coupled to the PDIC so as to contact the plurality of lands.

The PCB may comprise a flexible PCB.

The PCB may comprise a plurality of contact points that contact the plurality of lands, and wires formed on the PCB to connect the plurality of contact points to an external circuit may extend in a lateral direction that is perpendicular to the height direction of the optical pickup.

The PCB may comprise a plurality of contact points that contact the plurality of lands, and some of a plurality of wires formed on the PCB to connect the plurality of contact points to an external circuit may extend in a lateral direction that is perpendicular to the height direction of the optical pickup, and the remaining wires may extend in a second direction opposite to a first direction corresponding to a direction toward an objective lens of the optical pickup.

The plurality of contact points may be formed in two lines that face the plurality of lands, wires extending from contact points arranged on a line that is closer to the objective lens may extend in the lateral direction, and wires extending from contact points arranged on a line that is farther from the objective lens may extend in the second direction.

A height of the optical pickup may be 1.75 mm or less.

In an aspect, there is provided an optical pickup including a light source, an objective lens which focuses light emitted from the light source on an information storage medium, and a photodetector unit which receives light reflected by the information storage medium to detect an information signal and/or an error signal, wherein the photodetector unit comprises a photodetector integrated circuit (PDIC) comprising a light-receiving portion which comprises a main light-receiving part and sub light-receiving parts respectively disposed on opposing sides of the main light-receiving part, the main light-receiving part and the sub light-receiving parts each comprising a plurality of sectional light-receiving areas, and a plurality of lands which output a detection signal of light detected by each of the sectional light-receiving areas of the main light-receiving part and the sub light-receiving parts, and the plurality of lands are arranged to form two parallel lines in a height direction of the optical pickup.

The photodetector unit may further comprise a printed circuit board (PCB) which is coupled to the PDIC so as to contact the plurality of lands.

The PCB may comprise a flexible PCB.

The PCB may comprise a plurality of contact points that contact the plurality of lands, and wires formed on the PCB to connect the plurality of contact points to an external circuit may extend in a lateral direction that is perpendicular to the height direction of the optical pickup.

The PCB may comprise a plurality of contact points that contact the plurality of lands, and some of a plurality of wires formed on the PCB to connect the plurality of contact points to an external circuit may extend in a lateral direction that is perpendicular to the height direction of the optical pickup, and the remaining wires may extend in a second direction opposite to a first direction corresponding to a direction toward an objective lens of the optical pickup.

Embodiments for speaker terminals of a speaker assembly are provided. The speaker terminals may include a first rigid conductive structure having (i) a first input terminal configured to couple to a first output of an audio source and (ii) a first output terminal configured to couple to a first input of a voice coil, and a second rigid conductive structure having (i) a second input terminal configured to couple to a second output of the audio source and (ii) a second output terminal configured to couple to a second input of the voice coil. A speaker basket is molded about at least a portion the first rigid conductive structure and at least a portion of the second rigid conductive structure. Such a speaker basket having molded within the speaker terminals may be a component in a speaker assembly.

If we see the picture on Sam's page, the laser operation is relatively simple:

The laser diode (2) emits UV light that is conducted through a system of mirrors and prisms until the focus lens (12).
This lens can be moved in several axis using three coils. This allows the pickup to focus the laser on the disk, follow the audio track (tracking) and correct the laser angle.
Once the laser is reflected on the disc surface, it goes back through the lens (12) and through more prisms and mirrors is redirected toward the photodiode array (4) where we get the RF signal as well as the signals needed to correct the focus and align the laser with the track (tracking).
To auto-focus, the electronic reader reads the signal from the photodiodes (4) and moves the focus lens (12).
All the information about optical pickups is often classified. It is possible to obtain only superficial information about old models of CD or DVD readers. Thanks to them we began to learn about optical pickups and got very valuable information to deduce how use the PHR-803T. After all, the DVD technology was an improvement on the CD, and the HD-DVD/Blu-Ray an improvement on DVD, so we thought that the techniques used should be similar and the pinouts similar as well.

For our purposes we just needed to turn-on the laser, modulate his power and focus it properly on the PCB. The PHR-803T has a FPC connector of 0.5 pitch with a 45 pinout. Only connect some wires to the connector took us some time. We finally designed a special breakoutboard to easily "sniff" the signals.

Optical disc drives are an integral part of standalone appliances such as CD players, DVD players, Blu-ray disc players, DVD recorders, certain desktop video game consoles, such as Sony PlayStation 4, Microsoft Xbox One, Nintendo Wii U, and Sony PlayStation 3, and certain portable video game consoles, such as Sony PlayStation Portable. They are also very commonly used in computers to read software and consumer media distributed on disc, and to record discs for archival and data exchange purposes. Floppy disk drives, with capacity of 1.44 MB, have been made obsolete: optical media are cheap and have vastly higher capacity to handle the large files used since the days of floppy discs, and the vast majority of computers and much consumer entertainment hardware have optical writers. USB flash drives, high-capacity, small, and inexpensive, are suitable where read/write capability is required.

Disc recording is restricted to storing files playable on consumer appliances (films, music, etc.), relatively small volumes of data (e.g. a standard DVD holds 4.7 gigabytes) for local use, and data for distribution, but only on a small scale; mass-producing large numbers of identical discs is cheaper and faster than individual recording.

Optical discs are used to backup relatively small volumes of data, but backing up of entire hard drives, which as of 2015 typically contain many hundreds of gigabytes or even multiple terabytes, is less practical. Large backups are often instead made on external hard drives, as their price has dropped to a level making this viable; in professional environments magnetic tape drives are also used.

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View all CD ROM PS2by Yancheng Connector Electronics CO.,LTD3 Star2.54mm CD ROM connector
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PH2.54MM SERIES Current rating:3.0Amps Insulator resistance:1000Megohms Min. Dielectric withstanding:AC500V Contact Resistance:20
Min. Order: 1000 Pieces
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This was a great help after my 2 yr old put a coin in my PS4. However when following the steps backwards I got to step 7 which says 'Remove the 5 wire plug attached from the power supply to the motherboard' & couldn't see how to reattach it. I then noticed it looks like I've pulled the whole plastic white casing/plug holder (within the orange rectangle) off the mobo rather than just the plug from the casing. Although the pic looks like the plastic casing does come off the mobo as it's at an angle (maybe why I pulled the whole thing out or maybe I did it right).
I'm thinking I've made a mistake is because now I cant see anywhere that I can 'plug' the 5 L shaped wires on the bottom of the plastic casing back onto the mobo. Plus where they used to be attached there's now 5 tiny silver rectangles on the mobo (2 opposite 3), so I guess these 5 wires were some how adhered to those mobo rectangles by a conductive adhesive of some sort.
Any suggestion for the best repair method would be appreciated.

After some serious patent digging, it is apparent that the objective lens sits less than 600 μm away from the disc when reading Blu-ray discs. Since there are Blu-ray discs that are multilayer, you would probably end up with the objective considerably closer to, if not embedded in the disc, when reading deeper layers! The collimating lens on the servo is therefore variable so as to extend the range of focal lengths available at the objective.

The variable focus servo lens moves on a linear track driven by a micro-stepper motor. An LED and photodiode arrangement and a small `flag` ("photointerrupter"), provides the a position reference.

The Rest of the assembly

The individual parts of the assembly shown below, stripped from the sled, and arranged roughly with the same relationship they had in situ. Each piece has been carefully examined, and an explanation of its function explained.

Exploded view of the optical parts in the head

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Blu ray drive CD driver Flex PCB application

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Blu ray drive CD driver Flex PCB application