BSTJ 50: 2. February 1971: The Picturephone System: Station Set Components. (Gordon, A.M.; Singleton, J.B.)

20.5 MB·English

The Picturephone? System:

Station Set Components

Ty A, M, GORDON an J.B. SINGLETON
(Macunipt recived Cotber 2, 100)

The dowlopmost of th Piccurophons® stotion set roquivd the epecad
ucgn of many naw elecronis compononta. Tass inluis new caren nd
‘play tubes for optoclecto conversion, 18 nterated civil using Vath
{elie and tantatum felnoloin, amd several atonal ses dics
‘hie ortcle raviews the dtelopment ofthese cusom designed electri
comment

‘Th Pctaophone uabion st sexe of cho met eopistinted items
of ation enuient ree score) 4 el Syatem stoner Zot
Sritsued twovsey censmur‘cornm, To eospl, Ubu Pietaephone
Ration ac sereibles ¢wommerial closed ree texas am
Fodver, However, tae operating tndtions re meckedly difermt
tnd itnpose special sequrements any of tha component, To pro-
‘he tte opie to seca! onveron fm the tezanitter and the
invert fn the veseiver, anette the mut an eon unetons,
‘puns ver A sletreel components fa the wation vet Tee rans
{rom inrle psi diverts nesistore the eon diode array camara
tube whieh contain crer 800000 deer i ie ajprstanaly 02
Store inch seve tages aes

Ce ‘ibinations of hybrid integrated eireuite utilising both silicon
ani tonto fedinologie elieon meni rity dre olde
‘ete devi, and dente pativevorputets ace incorporated on the
Sarour cna, bows, Addioaal somparente const of fhe camera
Sud clspley ther end ero scive aonsoirata deioes whieh are
tied in he higbevotiage power py. The elie earonente teed
inthe play, sono abd nervio unite one saan in Bg I

“To dovden the eoplex sation ac eeuty in an entry fashion,
ie wan every to dese erly in the deign whch potion of the
ficeity wer do be sealed i Sntograted form. Some cies o>
{1 vu se, avezase aremyr0st soma, raMUAHY 297

quired the pression tuning sniduble with tentatum thin-film tech-
ology wnd were designed using hybrid inlegrated cients. Other ot
‘ully ere unecononsital in ep ed/or cont Lo be bail n dterete form
nd their designs were realized in. monolithio silicon form In til
teber cizouils it wes found that though they could be realised in
‘isorete form, # would be aivariageous to utilise the malehed char-
‘oleritis availae on econ chive, Thus intogeuted clevut designs
swore te where fs mae bet veal 0° eeonomie eense to use Ue
Gab of this design effort, uacerules joins by the Syatome Develop-
reat and Devies groupe, 28 alicon integrated circuits (S1C) of 18
Aifnete designs evuleat or Pi 2 etesion a use, The rst
bvidely sei BIC is tho bile Block eieuit which is used in coven
Alifernt appiestions.

A smplted Block ingen of the Picturepbone station st ix shown
in Vig. 3, 8, and 4. Theo excite which ubiize byheid and monolithic
Integrated eceile nce mavked accordingly

‘Several dierte componente were exstom designe (o operate under
the special coatitons uid inthe Picturephone stotion vel Tale
rrp 88 enarnasmeTs as

to

in this eategory are bipolar (nesilors, alin fle ater transis,

ao sad 9 eoulevely inoresungrable packaged
ele ill Nh yh toe ts ieon hil ene
ing ce'eym whic eit spesal haraets
ian

tom deeigned and ©
tion forse ath

Several uniqde propertics exe eguired of seamen lube for
Picturepkone serviee!" Lile sn soiabisy aiast be consistent ith
an

ig 1Ronsver Hck dng.
‘Bel Systm standards. Phe exmera tube mast gperat in environments
‘whore there are bright lights cad high tenperslanes. [t ust withstand
Toechanies) sone anil have the sblity to rouctempidly when called
‘upon. Tn mcoting these nbjeerive, the required power ust be Kept
fs vinimam ang che mnofarining cas snust be suiclently Tow te
Seis ao in Petrone serion

‘Theee roqurements ave fulfled In the design of thy Picturaphone
camera tube, Unie pervious eamceza tubes which sxe un enwrplios
fubetenoe athe phovoonnurkingelaant, thie dosimn uses an eeray 0”
Aiodes (~626,000 in the Senne anes) c= waite crystal slik
fon. This eppeouch reall in n Lage shesen in Pig having the fol-
levying osear agen compared to un nenrphous large

8) Tei nat damaged by any rsasonsbls let oures,
(G8) Soaitvly ia uaproved y= factor of eas 340

(i) Ty allows the wean sir be reetzuicaly changed wisbout
satoeran eet

(0) He pene ang il

igre 6 eiowe the ciueractatw straraze which Ins bora designed
vo sok! th slioon target ae thal ib ell wihetzad mocha! shol,
Sn exeets of 50.G size wil be mcintsied st the temperature of the
‘mation set Sroxk panel, The Sewer. gun and cuan foousiag electrode

Iron wineney eterna

Seana emeus See

ig lok ing of sn ad serie al
18 yun unex sver¥ar-Tromreat sounMA, PRARUARY un

sre ansembled by brazing th netullic parts to high alumine etamie
Holideteee bani glees ie wed for the envelope and vesls are made
<ircotly betwoen glass end mei, Thie teemique oonteass with that
{wel in ma vile doves, in wich a sof rvlal eal (auch us
Stati) Tornss an Gnlcrtinge lager betwen glass aad eactal. An
‘advantage of the diet seal Babreen glace not molal is thst high
rosesingtnperators ean be uted which enbiner Tong esthade ie
‘The onthe hae been desigeed to mateh the long life expected of
the silicon target, A thin layer of nickel i used lo ont the electron
‘eve eahode paetioes 9 that the reralting cathode ean Ue oper=
‘ed lower lance or a given eurent, Use of this sostiog
techniqu® along wich the proner nickel base allay provides euthode
wich greator Cun Gve-Foar life rxpeetaney
‘Masafastring thrives al Zariiies ave been designed to on
‘nance relibility, Target are freoceeed and cubee cesembied within
Taina ow york Wenehes whisk are installed within «roortZi with
filler wir, Arserly wtatony ata ached na menner ta miniiee
‘ontamination of the work area, Final tbo eciauet is euced ut on
fn alfsee high vasuun sation, with sftimate preceare atthe time
‘of tube pinch of uf abou: 2 % 10°* are,
‘The physical dasisn philosophy used in she sation set has been éo
form, Marnfeare ofthe eamere, tbe

The required eiexite are mounte willin the
seamera packago us -be take cinuecturing plant. They inehude detec-
tion eoie, magnaie ehisiling, wrahestonnts for eeflsation ouzzents,

Fig |Chmer sabe tat

520TH RRL STEW TRREAE, JOURNAL, FRAY IL

raster centering and all tube clctrode vollages as ehuwn in Fig. 7
Ajutmont ofthe cara: tsho wil nat he nsseary when i is mounted
in te station wt

‘The enruera ale operates st @ peak signal current of 295 mA end
‘hes mat signal autpt in exoee of 200 A. At room temper
tre the dl signal etre is aboot 10/18. For ineandescon? ight the
verge stzaltivity iy 175 2A por 0 foolonle, Operation of the
begins almost instantly when & eal eitiato’ or armored thik par=
formance is attsined by mairtining the tubo ut 80 peroont of is
operating hata: voltage doring standby porieds

Requirements on the display ‘ube are also semomat more stingent
Lan told be found fa anvmal eommersc] applications. Ts add
‘ion to providing long, unattended ble, aad thoce reistanve, the
potential hazard of the envelope imploting must he eumsidered for
Derconnel proterson. Implosion pectttion ie provided by applying a
Tatrina‘ed vafety panel over the expoatd Zac of the tube. Additonal
fmploson pocection is provided Zor the funnel portion of the inbe
Jy vorpelely erenptating i. in a pavyorethaae jadket. Suze lhe
feared polyarethene material edheros lo Use glass envelope, it pre-
‘ents cellapca ofthe funnel upon fracture of the display tabe

"The Sislay tube ie manofactered with a noa-browaing gli
fenvelae, ‘Thi insure thal lngeinre bomberdment of the lass by
lhe high-vokageelecton bess will not result in 9 glee olor ehange
‘which might alter the apestrel quality of tao emitcd light. Convene
tional sesling techniques ave sant tn deposit e white phosphor. To
inorense suis’ gh. ail to peolecs the pesphor layer from ion

ese anion

‘Ascambly of the elect sau wailing of lunes sel parte in
performed on laminar tow benches. Cathode tscbaiquos, a described
for the ecmers ‘ube, havo teen ake to msiiey fo capability. To
further extend operating lite the aneraze ear eurant be ell to

Ta keeping with tho tos ene, tn Piturephona display we
eakage shown in Fig, 8 conlsine the dadlecon yoke sn onnlering

Fig Choe view of Silay ae
522° sw nm SYREN THONTCAL JOUAAD, SAMUS

components. The eatin: paskogs is agembled atthe tube mazufaeiae-
ing pl, To Fziprove prestrain very bight ambit ight the
Tamloated face plate which is appliod over the iran of she ube fo
‘implosion proton sonpertes SO portant The caemsieion Str.
With thie fooe pte, less thin 9 perveu of Ue inn roor High i
combined with the video display, yot oho hight brightnem ean ex-
teed 100 foot lambert, daaly, tie online weonbly sewn in Fig. 9
neapeulated in the proviews” meational polvuerthane jackel. Thie
toi, im adios to provide polation from fying glam in the
feat of en implosion ofthe bal, alo rashes a fom and repron
Eedble meccbuacn? allow fur sting within the ation act. The
Eniehed unit provides package 0! canederable payeioalarength and

plueament of play tube equiva only adjustment of zante see
sand centering

Pi Babe apy ta