Category:Photolithography PCB Fab - Revision history

Mirage335 at 22:40, 11 February 2016

2016-02-11T22:40:51Z

← Older revision		Revision as of 22:40, 11 February 2016
Line 96:		Line 96:
	* Tracing paper photomasks, as reported at [http://www.electricstuff.co.uk/pcbs.html].		* Tracing paper photomasks, as reported at [http://www.electricstuff.co.uk/pcbs.html].
	* Polyester drafting film, as reported at [http://www.amazon.co.uk/dp/B00378TP12/?tag=-af-21#customerReviews].		* Polyester drafting film, as reported at [http://www.amazon.co.uk/dp/B00378TP12/?tag=-af-21#customerReviews].
			* Official MG Chemicals photomask transparency sheets - [http://www.mgchemicals.com/products/prototyping-and-circuit-repair/prototyping/transparency-film-416-t/] .
	* Professionally printed or phototypeset photomask (perhaps kinkos does this).		* Professionally printed or phototypeset photomask (perhaps kinkos does this).
	* PCB processing spray tanks for developing and etching. Expected to improve quality and ease of use, allowing higher yields and more attempts as necessary.		* PCB processing spray tanks for developing and etching. Expected to improve quality and ease of use, allowing higher yields and more attempts as necessary.

Mirage335 at 22:36, 11 February 2016

2016-02-11T22:36:15Z

← Older revision		Revision as of 22:36, 11 February 2016
Line 95:		Line 95:
	* DLP projector maskless lithography.		* DLP projector maskless lithography.
	* Tracing paper photomasks, as reported at [http://www.electricstuff.co.uk/pcbs.html].		* Tracing paper photomasks, as reported at [http://www.electricstuff.co.uk/pcbs.html].
			* Polyester drafting film, as reported at [http://www.amazon.co.uk/dp/B00378TP12/?tag=-af-21#customerReviews].
	* Professionally printed or phototypeset photomask (perhaps kinkos does this).		* Professionally printed or phototypeset photomask (perhaps kinkos does this).
	* PCB processing spray tanks for developing and etching. Expected to improve quality and ease of use, allowing higher yields and more attempts as necessary.		* PCB processing spray tanks for developing and etching. Expected to improve quality and ease of use, allowing higher yields and more attempts as necessary.

Mirage335: /* Environmental Concerns */

2015-06-23T16:05:52Z

Environmental Concerns

← Older revision		Revision as of 16:05, 23 June 2015
Line 184:		Line 184:

	===Environmental Concerns===		===Environmental Concerns===
	Cupric Chloride (typically the green stuff) should be used as the etchant, as it can be recharged completely with atmospheric oxygen and hydrochloric acid.		Cupric Chloride (typically the green stuff) should be used as the etchant, as it can be recharged completely with atmospheric oxygen and hydrochloric acid. However, Ferric Chloride should be used initially, as it performs better with less tendency to 'grow'.

Mirage335: /* Photo-Patterning (All Layers) */

2015-06-23T15:23:12Z

Photo-Patterning (All Layers)

← Older revision		Revision as of 15:23, 23 June 2015
Line 134:		Line 134:

	==== Photo-Patterning (All Layers) ====		==== Photo-Patterning (All Layers) ====
	# UV '''photoexposure''', high contrast, using DLP projection ~~or microscope RepRap tool~~.		# UV '''photoexposure''', high contrast, using DLP projection.
	# Warm '''photodevelopment''' bath (exposes desired copper).		# Warm '''photodevelopment''' bath (exposes desired copper).
	# '''Rinse''' spray (pH should be neutral -<1.5).		# '''Rinse''' spray (pH should be neutral -<1.5).

Mirage335: /* Photo-Patterning (All Layers) */

2015-06-23T15:22:09Z

Photo-Patterning (All Layers)

← Older revision		Revision as of 15:22, 23 June 2015
Line 134:		Line 134:

	==== Photo-Patterning (All Layers) ====		==== Photo-Patterning (All Layers) ====
	# UV '''photoexposure''', high contrast, using DLP projection.		# UV '''photoexposure''', high contrast, using DLP projection or microscope RepRap tool.
	# Warm '''photodevelopment''' bath (exposes desired copper).		# Warm '''photodevelopment''' bath (exposes desired copper).
	# '''Rinse''' spray (pH should be neutral -<1.5).		# '''Rinse''' spray (pH should be neutral -<1.5).

Mirage335: /* Expensive Components */

2015-06-23T15:21:21Z

Expensive Components

← Older revision		Revision as of 15:21, 23 June 2015
Line 180:		Line 180:

	Minimum cost to implement the full system is therefore around $700, a $1k budget is probably reasonable. Better projectors may be worth investing in, to ensure highly successful fabrication results are achieved.		Minimum cost to implement the full system is therefore around $700, a $1k budget is probably reasonable. Better projectors may be worth investing in, to ensure highly successful fabrication results are achieved.

			Higher resolution, lower-cost microscopic projection systems for mounting on RepRap type machines are also underway.

	===Environmental Concerns===		===Environmental Concerns===
	Cupric Chloride (typically the green stuff) should be used as the etchant, as it can be recharged completely with atmospheric oxygen and hydrochloric acid.		Cupric Chloride (typically the green stuff) should be used as the etchant, as it can be recharged completely with atmospheric oxygen and hydrochloric acid.

Mirage335: /* Research Underway */

2015-06-23T05:28:04Z

Research Underway

← Older revision		Revision as of 05:28, 23 June 2015
Line 99:		Line 99:
	* CircuitWriter repair pen to repair scratched or undercut traces.		* CircuitWriter repair pen to repair scratched or undercut traces.
	* Conductive ink, rivet (http://www.megauk.com/through_hole_rivets.php), or 'bar' (http://www.technick.net/public/code/cp_dpage.php?aiocp_dp=guide_pcb) through-hole connections. Apparently, the rivets can be used without the expensive punch tool (http://www.electricstuff.co.uk/pcbs.html).		* Conductive ink, rivet (http://www.megauk.com/through_hole_rivets.php), or 'bar' (http://www.technick.net/public/code/cp_dpage.php?aiocp_dp=guide_pcb) through-hole connections. Apparently, the rivets can be used without the expensive punch tool (http://www.electricstuff.co.uk/pcbs.html).
			* Spray on photoresist, for repeat exposures. Quality results with spray resists have been reported at http://www.marwynandjohn.org.uk/GM8OTI/projopticalpcb/projopticalpcb.html .

	==Full-Scale Process==		==Full-Scale Process==

Mirage335 at 19:05, 21 November 2014

2014-11-21T19:05:32Z

← Older revision		Revision as of 19:05, 21 November 2014
Line 75:		Line 75:
	Aligned reverse side.		Aligned reverse side.
	[[File:DevelopedEtchedStrippedTested_Reverse.jpg\|500px]]		[[File:DevelopedEtchedStrippedTested_Reverse.jpg\|500px]]

			=Safety=
			Please be careful with the chemicals, most of which are strong acids or bases. Strictly avoid contact and vapors. Nitrile gloves are available. Immediately rinse and move to fresh air after any accidental contact.

			Generally, the most hazardous operations involve the etchant bath, and preparing fresh photodeveloper. The actual PCB fabrication process itself, applying an etchant bottle to a sponge and using non-concentrate photodeveloper, is relatively simple.

	=Reference=		=Reference=

Mirage335: /* Resources */

2014-11-21T18:51:16Z

Resources

← Older revision		Revision as of 18:51, 21 November 2014
Line 51:		Line 51:
	=Resources=		=Resources=
	HacDC has the requisite resources:		HacDC has the requisite resources:
			* Permanently installed workroom incandescent safe light.
	* Flourescent light array exposure lamp.		* Flourescent light array exposure lamp.
	* Modified EEPROM exposure box including timer, germicidal lamp, foam backing, and laser-cut acrylic PCB/photomask holding jig.		* Modified EEPROM exposure box including timer, germicidal lamp, foam backing, and laser-cut acrylic PCB/photomask holding jig.

Mirage335: /* PCB Design */

2014-11-14T19:10:00Z

PCB Design

← Older revision		Revision as of 19:10, 14 November 2014
Line 11:		Line 11:

	=PCB Design=		=PCB Design=
	Recommend gEDA. Project template with CNC Mill and gerber export scripts available on [https://github.com/mirage335/gEDA_Template github]. Photolithography scripts are specifically provided at [https://github.com/~~HacDC~~/~~HacDCPhotolitho~~ the ~~HacDCPhotolitho~~ github repository].		Recommend gEDA. Project template with CNC Mill and gerber export scripts available on [https://github.com/mirage335/gEDA_Template github]. Photolithography scripts are specifically provided at [https://github.com/mirage335/gedaProduction/tree/master/hacdcPhotoLithography hacdcPhotoLithography subfolder] of the [https://github.com/mirage335/gedaProduction gedaProduction repository].

	=Design Rules=		=Design Rules=