DE2331298C2 - Optical-electrical arrangement for generating an electrical signal from the perforation of a tape-shaped recording medium - Google Patents

Description

also so aaa

15th

ao see tt. Amplitude sieve from the perforation * ?. Separate α wrfs component in order to generate a touching impulse from it. _{ten this procedure}

fJ ^^ rJJSuibi only for films that are also in the

«Ωκ" ^ * _{aae have a} certain blackening

^Fe *? ° ^ra ™ j ":: L _Λβ perforation triggered impulse itself

and aeruu ^^ ^ ^. ^ _environment stands out.

on this gcuug ^ _Am ^ _Iitudeil äebe the Femssh-BeKannuttu lir _-ulse component in the order of magnitude ß ^erate ^ ^c '_ fiesa ^ ntsignal designed. There are, however, if the _{perforation tracks} are crystal-clear, ίΤ _{ε1εη (1} εΓ light beam is only slightly weakened compared to its passage through air (perforation). Also normal amplitude _sieves ^ _7-wei also fail elaborate Ι |? dj _e voltage events be- ** ^ ™ "repercussions on the Ab-1 ¹ H _{w of the fi} i _ma btastung

^xh F & l ™haben '™ _lshonen I am more critical because of the genn £ lmp ™ ng

with 'tcbea cmj ^^ ^ _{£ rknnen VQn} There are also jnoran & _ä known, with

.5 J ** «*» "^ i ^ üchiuellen are present, those mmdes ^{™haben L} J ⁿ ^ _6n ^ te of the

the * * * located on "Jl photosensitive Zel" achnungrtJraee ^"1" ™ "^ _GCTI J _s is that the

* »Xj ^ JAJiS TSAk dl Maierial of one of the two lLicmq ^ during the

JS receives. the end

constant potential difference through one
Flow direction operated pn junction with subsequent voltage division is generated.

isrisa ä t in nen (German

should one

d _C r he mentioned at the beginning of a normal

direction of the resulting voltage drop in the 45 through the perforation
This silicon transintor's basb emitter range wins, em ? Y
in whole or in part to generate the constant control f * »*« * ¹ «"
iotential difference w ^ rd. ^^

FilmvoSS

z ^^

The E rfindung relates to an optical-electrical connections ₅ through the perforation the o

^ ™ r £? F * _m * ™ _e rn, the z. B. from pure. The .

a Super 8 cine film a television signal through time drifting like ^^ "^" ^ JK ^ SS Hentellen a scanning process, adjust the synchronization 55 component aging, etc. and should only be limited cause a continuous film advance from the cost. Requirement 1 ee perforation The object is achieved for the first time by the inner edges of the perforation identified by an oblique means in claim 1 Incidence of a sharply bundled light beam through opposite taSjdto Technk w rd first

Light-beam to a light-sensitive component and from the voltage emitted by it through a known from television technology

manufactured. Which is in the ig

adjusting voltage ** «*" »J;

pending as it is generated by impulses which then

\ J

2 3312S8

ntsteben, if the voltage U ₁ emitted by the light source, which corresponds to the peak value of the output

light beam through a hole of the perforation, so signalsU ₁ corresponds, if one simplifies

Audi air, runs. The absolute amount that results in the voltage drop in the diode in pass-through Initially neglected peak value in the regenerative circuit.

As can be seen from the oscillogram c), the potential

Subordinate importance. Although it is dependent on the difference A u, it is measured in such a way that only the

~ "f the aging and pollution of the light head of the pulse peak at the points ι of the Oszm ° -

^ uellle etc. it changes but only very slowly gramms a) exceeds the constant level U ₁

· «Ijurfe a long time. Practice has shown, and the second output signal M ₂ in discussion between

* £ ß Laneze changes in the ratio 1: 4 still xo see the holes of the perforation even with the whole

Without any influence on the perfect function, the crystal-clear film does not come close to U _x . Uer

Be out. downstream differential amplifier 12 is so dimensioned According to the last-mentioned state of the art, an output signal is only created then

ctrfit has the advantage that only a single light source (oscillogram d) when u ₂ crosses over U ₁ .

S also only a single light-sensitive element. _s At the first input 13 »is the output of the Söttet is connected to integrating arrangement 9 and over

Tasks never ordered are fully fulfilled and carries the DC voltage U ₁ on it. The first cm-

Arrangement is simple, reliable and inexpensive. output 13 is connected to the base of a transistor14 Sfoliend is an embodiment example tied to hand, in which ^Ε ™ « ^εΛΓε « / " ₃ ^ £ 5

of the elongations. «Is switched. The voltage drop on

^4Cr ? f di Wiki d Ad £ ** «* £ ^ &? £ Τ

ungen described. G

A?, L shows the mode of operation of the arrangement £ ** «* £, ^ &? £ Τ2 £ * ΐ5τ

Fig 2 'shows an executed circuit. lektorkreis a very η ^ ⁰ ^^ "™ * ^ _A "'

A? uXelle 1 (Fig. 1) sends the current through the Trans «to; 16 auc ^ be, Au opening in the diaphragm 2 by means of a control so small that it does not have a perforation track 4 of a film 5 the borrowed additional voltage drop in the Wi SdwätzunT des Fümes, the light beam 3 more 15 causes. The voltage at the emitter of % faS3L weakened. Only when it occurs through a disturbance 16 as im ™ * f} ^chtn * ^m £ "^ Lodi de? Perforationss _P ur 4 does it have its full detour via the emitter follower 14, and 15 besides intensity If the film is moved, then the 30 The base of the transistor 16 is modulated via the LSS 1. The passing perforations input 18 of the ftfae ^ JJ «» «^

i ass

LSSl modulated. The passing perforations entrance 18 de

änslöcher cause a series of pulses with always a second output signal u

gSchWeibender peak height (hole = air), while current flow in transistor ^ 16 ^

rend between the perforation holes are each about 0.5 volts higher than that of

gram a) is fed to an amplifier 7. In the 40 surge voltage before, for example,> ^ - "^ ^ ₁ oscillogram a) the curve of the output voltage current in the transistor 16 & ™ & ™ ^ _{6 influence} over time can be seen. At the points s is the u _t runs downwards. Dashe, ß ^ eeutonn S completely black. The output voltage is zero. On the ^Α ^ ξ £ ^η "^^ £ holes of the black controls in the perforation track blackening of the film often occurs when the edge of the film is printed Her- 45 Perforati f «™haben £ _{def tried and tested} switch plate information · At position g , the F, lm is crystal clear. A b b. 2 shows emcim der wan V _Light Here the drawing does not correspond to reality. tion. The ^^^^ SS ^ iiSL » Photo-With a good crystal-clear film, the difference in _{the light beam in n} ^K °" ^c ^ ° * ^ £ of the light source is only 2 to 5 · /. Compared to transistor 20. Per ™ * ^Be ^ fenhe, '"^ the value 100" /. At the points / (perforation). Be, 50 can be found on the emitterJjJ ^ g ⁸ ^^ "5 and a drawing to scale one could see the m- ^ K ^ Jf ^ Ζ \ ££ ί explanation is anpulse i to the SteUen barely see. at the point k 20 volts are Fmjte ^ JJ _"10 volts besei a scratch or other mechanical loading f ^nom ™? ⁿ · ^ * ^ ^ fv \ rweisSng physical damage to the film indicated. deceive. The at point ^^ JJJ ^ J transistor

^{A DC voltage source 8 is connected to the output terminal of the} amplifier 7, which carries the 55 · - """* Airch the nachtoigena ^ n output signal, which applies a preferably adjustable DC voltage to the output signal.

increased, thereby in addition to the first exemplary diode ™™™™ JZ £ $ £ in subsequent input signal u _t a second output signal H ₁ is created, routes 60 here ⁿ ^ * ^ gdrtwis but the principle that only a constant potential difference A u btufen the Polantat ^^ ~ ^ _{Diod the} e shifted, but otherwise the same ac ·· ηΐΛ-jndjL D, e> Ba ^ JJJ _"Teüer has _{made the} moderate course (oscillogram b). That first of about 0 6 VoIt ^ mm ourc ^ ^ _{> poten} . AusgLgssignal «is now a peak voltage ^W ^ g ^" ^ "J Z -90 = 0.4 volts remains. nunlsgleichrichteUn und integrierenden Anord- * 5 ^Ιι ^ ^ε "^^ ^ _ir kt rammen with the Konnuni 9 supplied, for example from a D, od« Der Tran ^S '^ ° I ^ ^ ,, "gs ^ cichrichter, where 10 and A smoothing capacitor 11 consists of Am ^ "sator 26 ak Spiteen. ^^ ann g ^^ _{M fl be} . The output of this arrangement is equal to the charging impulse

be bordered. The potential threshold between the base and emitter of the transistor 25 arises at the Capacitor a constant DC voltage of 8.8 volts, which is the first input of the formed from the transistors 27 and 29 'and the resistor 28, Differential amplifier, the base of the transistor 2 "7, is supplied.

The second output signal u, tapped from the resistors 23 and 24 by the voltage divider, is fed to the second input of the differential amplifier, the base of the transistor 29. U _t has a voltage of 9.0 volts at its peak. M ₈ is therefore only 0.2 volts higher than the constant DC voltage of 8.8 volts at the first input of the differential amplifier. This excess, which is very small in relation to the total voltage, is sufficient to generate the desired synchronization pulses at the output of the differential amplifier. If U ₂ falls below the constant DC voltage of 8.8 volts, transistor 29 is blocked and the output signal is zero. The degree of blackening of the film between the ίο holes of the perforation has absolutely no influence. The subsequent amplifier circuit amplifies the pulses obtained in a known manner.

For this purpose 2 sheets of drawings

Claims (1)

Patent claims: I. Optical-electrical arrangement for generation an electrical signal from the perforation of a tape-shaped recording medium itark alternating transparency, where emzigfcr Light beam through the perforation of the carrier on a single light-sensitive pad BauteU is directed and always when the light beam through a perforation hole runs, the difference between a first and a second voltage ii »a difference «Otter is formed and strengthened by it characterized in that the output signal of the photosensitive component, optionally after reinforcement, is divided into a first and a second Sigiaal, both of which are within their The entire course can only be distinguished by a small, almost constant potential difference the first signal of a peak voltage equilibrium and integrated circuit for the purpose of producing a reference level which is the first input of a differential amplifier controls, while the second signal works in a curve kink on the second Input of the differential amplifier acts and that the constant potential difference in direction and size is such that only when the light beam passes through the perforation generated peak voltage of the second signal em which exceeds the reference level ß ^erate io from zd