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Патент USA US3026780

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March 27, 1962
3,026,769
H. THIELE ETAL
DEVICE FOR RECORDING SWITCHING IMPULSES
Filed Aug. 25, 1959
2 Sheets-Sheet 1
March 27, 1962
H. THIELE ETAL
’
3,026,769
DEVICE FOR RECORDING SWITCHING IMPULSES
Filed Aug. 25, 1959
2 Sheets-Sheet 2
United States Patent Q?ice
3,026,769
Patented Mar. 27, we:
2
1
tion closes a DC. circuit over the magnet-head, when set
3,026,769
DEVICE FOR RECORDING SWITCHING IMPULSES
Heinz Thieie, Kiel-Wilt, and Arno Ritze, Kiel, Germany,
assignors to Zeiss Ilton Aktiengesellschait, Stuttgart,
Germany
Filed Aug. 25, 1959, Ser. No. 836,016
Claims priority, application Germany Aug. 29, 1958
3 Claims. (Cl. 88-28)
for “recording.”
In accordance with the present invention the entire de
vice for the recording and reproduction of switching im
pulses is constructed as a unit having its own main supply
and ampli?er. The device is connected to the projector
only by the switching line, and is connected with the
sound apparatus only by the sound track.
The main advantage obtained with a device of this type
The invention relates to improvements in a device for 10 is the possibility to use it with any type of projector and
any sound band apparatus. There is no need for any
recording switching-impulses on one of two separate
act to change the construction of the sound band appa
sound tracks of a sound tape moving in the same direction
ratus or of the projector.
for the purpose of controlling a projector, while the other
The invention is illustrated in the drawings as follows:
sound track is a carrier of a speech or other sounds, such
15
FIG. 1 shows a block diagram, and
as a musical composition or the like.
MG. 2 shows the circuit diagram of the control device.
The object of the invention is to perform the projection
One of the two sound tracks on the sound tape 2 is pro
of slides automatically and in dependence of a sound
vided with a record which after reproduction is erased
rendition or a speech explaining the pictures on the
within the sound device 1 in the usual manner. In order
slides.
to provide the other sound track with switching impulses,
It has already been suggested previously to arrange on
the sound tape 2 is led over suitable guide rollers past a
a magnetic sound band in addition to the recorded speech
magnet head 3 of the control device 4. The coil 5 of the
or other sounds, individual contact strips in such a se
magnet head 3 is arranged in series with the transistor
quence that the slide change of the projector may be per
stages 6 and '7 and the relay 8 which latter operates the
formed as a function of the recording on the band. How
ever, such contact strips on a magnetic sound band have 25 contact 9 located in the control circuit 10 of the slide.
changer 22 of the projector 11. A preferred embodiment
not proved successful. Therefore, another method has
of the slide changer 22 is disclosed in the German patent
been adopted which uses two separate sound tracks run
ning in the same direction, one of which serves as a carrier
application Z 7154 IX/42h, ?led February 25, 1959.
of speech and/or ‘other sounds, while on the other sound
track a control frequency is recorded which, after being
The circuit of magnet coil 5 also contains a push button
switch 12. The sound device 1, the control device 4 and
the projector 11 have each a separate connection to supply
scanned and ampli?ed accordingly, operates the slide
changer to cause the projector to project the next slide
onto the screen.
lines 13, 14 and 15 respectively.
The input transformer 16 (FIG. 2) of the control de
A well known method of this type operates with a fast
vice 4 is connected to a recti?er l7, supplying the required
relay-circuit so as to adapt the constant control-period
to the varying changing periods of the projector. This,
push button switch 12 is not operated, then a direct cur
rent energizes the magnet head 3 and thereby erases any
generator which latter supplies the switching impulses.
Since the push button remains in an operative position
until the slide change is completed, the length of switching
impulses is thereby ?xed.
tuned to about 1000 p.p.s. The noted feed back voltage
in conjunction with the condenser circuit generates switch
ing impulses up to the moment the push button switch 12
For generating electric waves a generator or oscillator
is released by the operator. This release of the push
button switch, however, occurs only after the slide change
decaying frequency of 1000 p.p.s., which otters the ad 35 direct current to the control device. The two transistor
stages 6 and 7 are arranged in the usual manner and in
vantage that for the recording of this control-frequency
clude in their circuit an autotransformer 24. To the
only an impulse-generator is required which requires only
output side of the last transistor stage is connected the
minor switching means. As against this advantage, there
relay 8 with its control contact 9 over the recti?er l8
is, however, the disadvantage that the decay-period of such
a frequency is constant, whereas the changing periods of 40 and autotransformer 23. When the multi-switch 19 is in
its left hand position as indicated by the left end of the
projectors vary considerably with their construction.
double arrow 25 in FIG. 2, namely to “reception,” and the
There is, however, the possibility to employ an additional
however, is to be regarded as an avoidable complication 45 recordings which may be present on the respective sound
track.
which can be averted, according to the present invention,
When the push button switch ‘12 is opened by a pressure
by providing the previously mentioned device with special
of the operator this direct current supply is cut off. At
means, which make the recording period of the control
the same time the output of transistor stage 7 is connected
impulses a function of the changing period of the pro
jector. For practical purposes, a push button is employed, 50 to the magnet head 3 and relay 8 is connected to the
D.C. voltage. Through the ?rst mentioned procedure a
which operates the slide-changing device as well as con
feed back voltage is supplied to magnet head 3. Con
nects the recording device to the oscillator or frequency
is required, in contrast to the well known device mentioned
above. This, however, does not result in a real complica
tion if the ampli?er device required for the reproduction
of the switching impulses is made use of as a feed back
oscillator for the modulation period. Preferably, a direct
current is impressed upon the switching impulses, required
for recording, in a well known manner, for the purpose of
denser 20 and magnet coil 5 form a resonance circuit
in the projector is completed. Therefore, the switching
impulses are positively recorded on their sound track of
such a length as required for the change of a slide by the
projector. The selected arrangement of the control device
supplies a direct current component to the feed-back volt
age. The choice of the size or value of this component
obtaining an optimal operation point on the hysteresis 65 determines the operating point on the magnetic hysteresis
curve.
curve. Such a direct current biasing is sufficient, since
When the multi-contact change-over switch 19 is in the
the value of the non-linear harmonic distortion factor
right hand position of “reproduction,” as shown in the
need not be considered, contrary to conditions in the
drawing, the magnet head 3 is connected to the input cir
method of recording and reproduction of sound entertain
ment. It is desirable to perform the obliterating method 70 cuit of the transistor. The output of the transistor is con
nected over recti?er 18 with the relay so that the switch
with one and the same magnet-head and this is achieved
by the fact that the push button in its non-operating posi
ing impulses appearing on the sound track operate the
3,026,769
3
relay 8 with the required length of time and thereby cause
by means of the control circuit 10 a slide change in the
projector.
What we claim is:
4
to be projected, said push button switch when in position
disconnecting said frequency generator and closing a
direct current circuit which includes a magnetic sound
head adapted for recording said magnetic sound head
when energized by direct current operating as erasing
1. In a device for recording switching impulses upon
a magnetic sound tape provided with two separate sound
head.
tracks moving in the same direction, of which one sound
3. In a device for recording switching impulses upon a
track carries a record of speech, music or the like, while
magnetic sound tape provided with two separate sound
the other sound track is used for controlling the opera
tracks moving in the same direction, of which one sound
tion of the slide changer of a slide projector, including 10 track carries a record of speech, music or the like, while
a manually operable switch in circuit with a frequency
the other sound track is used for controlling the operation
generator for determining the length of the recording time
of the slide changer of a slide projector, including means
of switching impulses on said other sound track in de
for determining the length of the recording time of switch
pendence of the time for starting the change of the slides
ing impulses on said other sound track in dependence of
to be projected by the slide projector, another circuit in 15 the time for starting the change of the slides to be pro
cluding a transistor for energizing said frequency gen
jected by the slide projector, said switching impulse re
erator, a magnetic sound head adapted to be employed for
cording device including a normally closed switch which
the recording of said switching impulses and also as a
during the recording is manually held open during the
reproducing and erasing head, and a change-over switch
period of time a slide is to be projected, said switching
for connecting said magnetic sound head into its record 20 impulse recording device forming with a transistor a self
ing position with the output of said transistor and in its
contained unit provided with its own terminals to be
reproducing position with the input of said transistor.
connected to a source of current supply, and a switching
2. In a device for recording switching impulses upon a
circuit controlled by said transistor forming the only
magnetic sound tape provided with two separate sound
connection of said unit with said projector, while said
tracks moving in the same direction, of which one sound 25 magnetic sound tape forms the only connection between
track carries a record of speech, music or the like, while
said transistor and another device which provides the
the other sound track is used for controlling the opera
?rst mentioned sound track with a record of speech, music
tion of the slide changer of a slide projector, including
or the like.
means for determining the length of the recording time
References Cited in the ?le of this patent
of switching impulses on said other sound track in de 30
pendence of the time for starting the change of the slides
UNITED STATES PATENTS
to be projected by the slide projector, said means inc1ud~
2,631,855
Kornei ______________ __ Mar. 17,
ing a push button switch arranged in a circuit with a
frequency generator, said push button switch when moved
to open position effecting a connection of the recording
device with said frequency generator as long as the slide is
2,787,669
2,811,588
2,847,513
1953
Plan et a1 ______________ __ Apr. 2, 1957
Julie _________________ __ Oct. 29, 1957
Schla?y _____________ _.. Aug. 12, 1958
2,889,742
Marturano _____________ __ June 9, 1959
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