Samvinna
LIST
FEGURÐ OG VELLÍÐAN
HANDVERK
MENNING OG SAGA
SKEMMTUN
UMHVERFI
MATUR OG DRYKKUR
ÖFUGVERKFRÆÐI
VÍSINDI
ÍÞRÓTTIR
TÆKNI
KLÆÐANLEG TÆKNI
5mm LED: Epoxy Lamp with a Reflector-Cup Lead Frame (Kosman, US 3,821,590, 1974)
A round LED indicator lamp about 0.200 in (5 mm) across. A red GaP chip sits on a small pedestal at the focus of a paraboloid reflector cup that is part of the lead frame. A fine wire runs from the chip to the other lead. The whole is moulded in clear or tinted epoxy, with small lenses moulded into the front face to spread the light.
Result: an encapsulated LED lamp visible within about ±45°, moulded many at a time on one lead frame.
Source: K. J. W. Kosman and L.-P. Boivin (Northern Electric), US 3,821,590 (1974). Unknown: lead and wire metals, die attach and cure. Picture: the patent drawing.
Sérfræðingur
Unknown
Leiðbeiningar
1
1
Make the lead frame with its reflector
Make the lead frame with its reflector
Make a lead frame carrying many lamps. In each, the negative lead ends in a paraboloid reflector cup with a small pedestal at its focus, and the positive lead ends nearby. Not given: the metal, sizes beyond the lamp's 0.200 in diameter.
Efni fyrir þetta skref:
Óþekktur málmur1 lead frameNauðsynleg verkfæri:
Óþekkt mál2
2
Mount and bond the chip
Mount and bond the chip
Mount a light-emitting chip with a P-N junction, for example red GaP:Zn,O, on the pedestal, so the cup makes contact with one side of the junction. Connect the other side by a fine wire to the positive lead. About 0.015 in square is the junction size Kosman gives for best efficiency. Not given: the die attach, the wire metal.
Efni fyrir þetta skref:
LED-flaga1 light-emitting chipÓþekktur málmur1 bond wireNauðsynleg verkfæri:
Óþekkt mál3
3
Transfer-mould the lamps
Transfer-mould the lamps
Set the bonded lead frame in a mould and transfer-mould clear or tinted thermosetting resin round all the lamps at once, front face down so any flaws fall at the back. The front face carries seven spherical lenses, six in a ring round one, each 0.045 in across with a radius about 0.8 times its width; an inclined edge sends some light out sideways. Ours: bisphenol epoxy (the patent lists epoxy, silicone, polyester or diallyl phthalate). Not given: the mould, the cure.
Efni fyrir þetta skref:
Bisfenól-epoxýkvoða1 capsule resinNauðsynleg verkfæri:
Flutningsmótunarpressa
Óþekkt mótunaraðferð4
4
Cut apart and test
Cut apart and test
Cut the lamps from the lead frame and light each one with current forward through the junction: the face shows seven bright spots in a 0.100 in image, visible up to about 45° off axis. Not given: the current.
Nauðsynleg verkfæri:
JafnstraumsgjafiEfni
3- 1 bond wireStaðgengill
- 1 light-emitting chipStaðgengill
- 1 capsule resinStaðgengill
Nauðsynleg verkfæri
4- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
Efni úr tengdum teikningum
Þessi teikning býr til
CC0 opinbert ríki
Þessi teikning er gefin út undir CC0. Þér er frjálst að afrita, breyta, dreifa og nota þetta verk í hvaða tilgangi sem er, án þess að biðja um leyfi.
Studdu smiðinn með því að kaupa vörur í gegnum teikningu hans þar sem hann fær þóknun smiða sem seljendur ákvarða, eða búðu til nýja endurskoðun á þessari teikningu og tengdu hana sem tengingu í þinni eigin teikningu til að deila tekjum.