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Quick-turn, prototype PCB (made in China)
Proposal Number 1037733
Business Type Export and Import of Products / Parts
Offer Type Offer to sell products / parts
Proposal Category 2919 Other electric and electronic parts
Country / Area Nagano, Japan
Date of Registration Apr 15, 2004
Date of Revision Apr 15, 2004
Detail Description
Quick-turn, prototype PCB (made in China)
<< FEATURES & CHARACTERISTICS >>
Quick-turn, protptype PCB made in China.
The manufacturing capacity is 7,000 sq/m per month, 4,000
different type of PCB per month.
They have many experiences of the protptype PCB for global
company, such as IBM, HP, Ericsson, Motorola, Siemens, NEC,
Omron, Canon and so on.
<< PRICE REFERENCE >>
Please ask
<< PAYMENT TERMS >>
T/T
<< MINIMUM ORDER QUANTITY >>
1 pc to 50 pc, till 5 sq/meters.
<< CAPTION1 >>
PCB Sample
<< CAPTION2 >>
PCB Sample
Target Country / Area JAPAN
Conditions of Products
/ Parts Inventory Made to Order Acceptable
Orders from Individual Acceptable
Delivery Time Less than 1week(s)
bunnie¡(¯s blog
--------------------------------------------------------------------------------
? Made in China: Quality (or, The Challenge)Winner of Name
that Ware August 2007! ?Made in China: Automation
I always had this impression that almost everything was
made by a machine. Of course, the tours of the textile factories
corrected my impression of that very quickly, but still,
high-tech stuff like electronics assembly tends to be heavily
automated even in China. The only exceptions were, ironically,
in the lowest cost sectors, such as toys. These shops are
still dominated by lines of workers still stuffing and dip-soldering
circuit boards by hand.
On the topic of toy factories, one interesting dichotomy
to me is the bimodal distribution of products that use chip-on-board
(CoB) technology. CoB assembly directly bonds a silicon
die to a PCB. Finished CoB assemblies have the distinctive
¡(°àh,glob of epoxy¡(±à`, look to them, as opposed
to the finished plastic package look.
At the high end of things, dense electronics assemblies
will employ CoB technologies. I¡(¯ve done a couple
of CoB designs for some 10 Gb optical transceivers in my
time, and they were not cheap. At the other end of things,
almost all toys use CoB technology, to save the cost of
the package! It¡(¯s a testament to the tenacity of
the cost reduction in China that a toy factory would buy
an automated wirebonder and stick it next to lines molding
doll heads and sewing up stuffed animals because it saves
that nickel.
For those who are not familiar with wirebonders, a typical
bonder takes a wire as thin as a human hair and bonds it
to a site on a silicon chip not much larger than the wire
diameter, and it does this several times a second. It¡(¯s
a very fast, precise piece of equipment, as you can see
below. The bonding happens so quickly that the board seems
to swivel smoothly around in the video, but in fact the
board stops 16 times as it spins around, each time getting
a wire bonded between the chip and the board.
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APPLIANCES
For years I have looked for a cheap and relatively easy
way of making professional quality printed circuit boards
at home. The method outlined below works very well if ALL
the steps are carefully followed, and can produce PCB's
with 20 thou (0.5mm) track widths. It is a very simple technique
and operates by transferring the black plastic toner from
the surface of either a laser print or a photocopy of a
PCB artwork to the copper surface of a printed circuit board.
This plastic toner is then used as the resist during etching
of the copper. The only secrets to the process are keeping
the surface of both the printing paper and the PCB copper
absolutely clean, and using a special type of printing paper.
Equipment
For the electronic hobbyist, the most common source for
a PCB artwork is the pattern printed for a particular project
in a technical magazine. To produce a PCB from such a source
you will need access to a good photocopier, 600 grit silicon
carbide wet and dry abrasive paper, an ordinary clothes
iron, A4 clay based paper, a soft nail brush, a clean old
cotton tea towel and a bar of ordinary Velvet Soap (for
those outside Australia this is ordinary unscented hard
milled laundry bar soap which is very slightly alkaline).
To generate your own PCB's you will also need a computer,
PC artwork software (e.g. Protel Autotrax- download this
industry standard package FREE from the Altium site at http://www.protel.com/downloads/eula_autotrax.htm)
and a printer. If this is a laser printer then so much the
better as you can directly print the PCB pattern on to the
special clay paper. Very useful additions to such a computer
system include a scanner and a photo processing package
such as Adobe Photoshop. The scanner will allow you to scan
a magazine artwork into the computer, while the photo processing
package will allow you to horizontally flip (mirror image)
the PCB pattern, a step which is almost always necessary
if this method of PCB manufacture is used. However, many
photocopiers and laser printers also include the ability
to do horizontal flips (and negatives of an artwork) in
their operating menus and so the photoprocessing software
may not be necessary.
The PCB Printing Master
Which ever way you choose to generate the PCB track pattern,
the end result must be a piece of special clay paper with
a mirror image on its surface of the image you wish to produce
on the PCB copper. The image produced by the toner on this
paper must be very dense and black with NO pinholes. The
special clay paper must be handled by its edges only, to
avoid contaminating its surface with finger skin oils, which
will ruin the adhesion of the plastic toner to the copper
surface of the PCB.
The Paper
The PCB pattern is transferred to the copper by re-melting
the toner on the surface of the clay paper with a clothes
iron so that it sticks to the copper. The paper behind the
toner therefore has to be removed and this is accomplished
by a process of soaking and gentle rubbing. Standard A4
paper will not work because during printing, the finely
ground PVC toner particles have been melted into the wood
fibres which form the paper surface. When the paper backing
is scrubbed away to leave just the toner protecting the
copper surface, the wood fibres pull some of the toner off
the copper, completely destroying any etch protection.
The paper which is used to produce photo quality prints
on your inkjet printer is a very different animal to the
paper normally used for text printing. This type of paper
has very few wood fibres in it, and these few fibres are
used to form a central supporting core. The surface of this
paper is made from pure very finely ground white china clay,
and when viewed with a magnifying glass, appears totally
smooth with the appearance of fine unglazed china. When
this sort of paper is moistened and gently rubbed, the toner
is released from the smooth clay surface without damage.
Using the preceding criteria, I went to my local stationer
and bought a ream of clay paper with a weight of 90 GSM
which went under the wonderful title "Impress Matte"
for around $50 (10 cents per A4 sheet) And this is about
what you should be prepared to pay for bulk quantities of
a matte finish "economy" clay paper with a weight
in the 90-100GSM range. In Australia, Celcast market such
a paper with the code number IJ84. But such data is not
helpful to someone outside Oz, and I would suggest that
you carefully examine and test your inkjet photo printing
paper - you might not have to spend a cent.
NOTE THAT GLOSS PHOTO PAPERS SHOULD NOT BE USED. THE GLOSS
COATING MAY MELT AND ADHERE TO THE FUSING ROLLERS WITHIN
YOUR LASER PRINTER OR PHOTO COPIER. IF YOU HAVE ANY DOUBTS
ABOUT YOUR CHOSEN PAPER, FIRST TRY IRONING IT WITH A DRY
CLOTHES IRON SET TO 'LINEN' AND SEE IF ANYTHING STICKS OR
MELTS!!!!!
PCB Preparation
The surface of the copper must be absolutely clean and
completely free of oils, oxides, stains and finger salts.
This is achieved by gently rubbing the surface of the copper
using a small amount of detergent and 600 grit wet and dry
paper with a circular scrubbing motion. This will actually
remove a very slight amount of copper, but don't worry because
this is exactly the process the professionals use in commercial
photo processing. The appearance of the copper surface when
this process is finished will be uniformly dull all over,
with tens of thousands of fine circular scratches which
form a 'key' on the copper surface to which the toner can
bond. When this surface appearance has been achieved, the
board surface is carefully rinsed off and then dried using
a freshly laundered (no oils!) lint free (old!) cotton tea
towel. Do not touch the board surface after it has been
dried. If you do finger oils will destroy toner adhesion.
Transferring the Image
To transfer the image, fold the paper around the PCB material
so that no relative movement between the two is possible.
The back of the paper is then ironed on a hard flat surface
(an ironing board will not do as it is too soft - a flat
kitchen chopping board is ideal). The iron temperature is
adjusted so that after about 20 seconds of ironing the back
surface of the clay paper has been uniformly discoloured
to a light yellow. Typically the iron temperature setting
used will be towards the upper end of scale (cotton or linen)
and the iron is of course used DRY. The clay paper surface
should remain flat during ironing and particular attention
should be paid to the corners of the PCB pattern with the
iron tip. The paper/PCB assembly is then allowed to cool
for about 5 minutes until it is near room temperature. (Do
not throw the PCB/paper assembly into water while it is
hot as this will destroy the toner/copper adhesion.) When
the assembly has cooled, soak it in water for 5 minutes.
Removing the Paper, Etching, and Cleanup
When the paper/PCB is removed from the water it will be
noticed that where there is no toner the paper has bubbled
outward (which indicates good toner adhesion to the copper).
Take a very soft nail brush, coat its surface with Velvet
soap, and gently scrub the rear of the paper, keeping everything
wet. The objective here is to reduce about 70% of the paper
thickness to pulp but not to break through to the copper
surface. The Velvet soap assists in wetting the junction
between the clay backing and the toner and assuring its
damage-free release. The last part of the backing is removed
using the finger tips only with a gentle circular rubbing
motion. Be patient and use only light pressure. If you have
done everything correctly the undamaged toner track pattern
should now appear on the surface of the copper. If there
are minor defects, repair them with a DALO pen or similar.
The PCB is then etched in one of the standard etching solutions
such as 43% ferric chloride (known as 43 Baume), or ammonium
persulphate. In an unstirred etch tank, etch the board face
downwards. This allows the chemical products of etching
to fall away from the copper surface, exposing fresh copper
and minimising etch times. Damage to the toner resist can
be prevented by drilling 3 or 4 holes in the waste areas
of the PCB and fitting plastic stand-offs. It will be found
that toner is an extraordinarily good resist and that it
will tolerate brutal overetching. When etching is finished,
the toner is removed with lacquer thinners or a hydrocarbon
such as petrol.
"Double sided" PCB's
Like everything else in this world, it is possible to make
a true double sided PCB using the above method if you are
sufficiently painstaking and determined, but you have REALLY
got to want to do it (and probably be stupid and/or desperate
as well).
Here is an alternative, which serves very nicely for most
electronics work at home, and only involves a little extra
trouble.
Essentially, all the tracks are laid out on one side of
the pcb, while the other side is simply a solid copper ground
plane to which everything that is "earthed" is
connected. This is great RF technique, providing an earth
return of absolutely minimum impedance, and some interstage
screening, both of which assist enormously in the design
and construction of stable circuits. It allows the construction
of transmission line sections on the pcb, and 50 ohm lines
are particularly simple to do. Routing of power to circuits
becomes simpler, and the laying out of circuitry which has
two or three power supply rails becomes fairly easy.
How to do it? Simple- create the etch resist for the track
pattern as detailed above. During etching, protect the copper
ground plane from attack by covering it with the stick on
plastic film kids use to protect their school books (In
Oz this goes under names such as Fablon,Contact etc). After
etching, remove all copper protection and then drill all
holes. Turn the board over, and insulate all component leads
from the groundplane by counterdrilling the copper groundplane
surface with a 3.2mm (1/8") dia drill, using the holes
just drilled as a guide. The trick is to just break through
the copper groundplane surface without drilling right through
the pcb (a disaster), and a drill sharpened with a sheet
metal point helps greatly.
The photo of the assembled Q meter pcb in that section
of this home page shows the finished result of this technique.
PROCESS SUMMARY AND PHOTOS
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Immediately before bonding, the chip is glued very carefully
to the board by hand, and immediately after bonding, the
chip is encapsulated by an operator dispensing epoxy very
carefully by hand¨Cso this is the only automated piece
of equipment on the line. Gives me a new sense for what
goes into those talking Barney dolls that sell for $10 in
Target.
Back to the general topic of automation. I think it¡(¯s
absolutely mesmerizing to see a chip shooter in action.
The chumby PCB assembly factory in China has dozens of lines
filled with tried and true Fuji chip shooters.
The chip shooters are capable of placing something on the
order of 10,000-20,000 components per hour per machine.
This means that each machine can put down about 3-6 components
per second¨Cthe robotic assemblies move faster than the
eye can see, and it all turns into an awe-inspiring blur.
In the video below, you can see the chip shooter in action.
It has a ¡(°àh,gatling gun¡(±à`, style action. The
gun itself is fixed, and the board dances around beneath
the gun. The chip shooter actually ¡(°àh,looks at¡(±à`,
each chip and rotates it to the correct orientation before
putting it down on the board. I wish bandwidth were a bit
cheaper so I could encode this video at a rate where you
can really see all the detail going on here.
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Lead No. 92166 hdtv player made in china
Description
MG-350HD is a true high-definition multimedia player. It
fully supports high-definition digital files in the HDTV
broadcast in high-definition television (such as LCD TV,
plasma TV, conventional high-definition television). It
can be wired or wireless local area network direct broadcast
media files in the computer, I can also read through the
USB external USB expansion of equipment (such as family
digital cameras, digital camcorders, DVD drive, USB hard
drives, etc.). * wireless high-definition? multimedia player
* with the latest and most powerful multimedia decoder?
chip Sigma_EM8621 chip design * full HD video playback,
the resolution can? be as high as 1920 * 1080 p * Built-NDAS
(Network Storage) support through? wireless, cable local
area network copy / delete files * support IEEE? 802.11g
(54Mbps) 802.11b (11Mbps) wireless technology standards,
10/100 Mbs wired Ethernet ports * Wireless security - WEP?
* wireless basic? model and AD-Hoc mode * support USB 2.0,
USB interface directly connected? to the computer * connect
via USB host port a variety of external USB? storage devices
* DVD management - the same as DVD players DVD documents?
* Video output - DVI, component (combinations), S-video
and composite? video output
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Wednesday, October 17, 2001, updated at 16:17(GMT+8)
Business
Made-in-China Electric Vehicles to Enter Market
Chinese scientists and engineers recently announced that
thanks to some important technological breakthroughs, electric
vehicles made in China will soon be sold on a large scale.
Problems with batteries, motors, and electric control systems
were three main obstacles in the development, but these
problems have now been solved, said Huang Jiateng, head
of group of state experts specializing in electric vehicles.
Sources indicate that engineers have developed a type of
lithium battery that can allow a car to operate for 300
kilometers and sustain top speed of 120 kilometers an hour.
A specially designed battery based on new nano materials
can be used for more than 10 years and can be fully recharged
within 10 minutes.
In addition, momentous innovations have been made on the
motors and electric control system, said sources.
Due to the short history of car manufacturing, China will
face a lighter burden during the transition from traditional
auto industry to the one based on electricity, said Li Peigen,
professor with Central China University of Science and Technology.
In the field of electric vehicles, Chinese engineers are
close to the world advanced level and have even taken leading
positions in some areas, said the professor.
The Chinese government wants families to buy cars and domestic
auto producers to expand their market share. Since the late
1980s, the government has spent 300 million yuan (36 million
U.S. dollars) in research on environmentally friendly autos
which use electricity.
China sees the development of electric vehicles as a chance
to breach the gap between its auto industry and those of
advanced countries, and the Ministry of Science and Technology
has set this growth as a main goal over the next five years.
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