In handsets with sign indication numbers and other signs
recorded on the screen using an electron beam, after
the cross section of which sets the shape of the sign
which is supposed to be recorded. So the electron
The first beam as if prints signs on the screen. Great worth
Most of these handsets are high definition characters and
The speed at which they are displayed. These tubes are very convenient for
their use in electronic computing, and
also in equipment designed to display
stuffy atmosphere.

As an example, consider typotron - a landmark
cathode ray tube capable of storing information
matsy.

Typotron developed in the United States on the basis of the usual (not
memory) sign tube, called Charactron.

In fig. 37 shows a typotron device.

Fig. 37. Typotron:

1 - recording spotlight; 2 - plate selection sign; 3 - 1st anode;
4 - focusing coil; 5 - compensating plates; 6 - address
plates; 7— 2nd anode; 8 — 3rd anode; 9 - ion reflector; 10 - mesh;
11 is the target; 12 - screen; 13 - matrix; 14 - an electron beam; 15 - counting
a spotlight; 16 - electron flow of the reading spotlight

In the neck of the tube is recording recording
torus. Created by a recording spotlight electronic
the beam passes through the matrix and acquires in the transverse
According to the form of the sign to which he was directed with
using special deflection plates of the sign selection.
The matrix is a metal plate in
which carved various signs necessary for
visual display on the Typotron Screen. 

Fig. 38 shows a photograph of the screen of the typotron with the image
matrix.

After passing through the matrix, the electron beam enters the mag-
the field of the focusing coil that returns
him again to the axis of the tube. Since the matrix is located
close to the focusing coil, then the magnetic field of the last
acting on an electron beam, twists it
by 3.5°. To compensate for this twist, the matrix
rotated in relation to the plane of choosing
plates at the same angle. In addition, for clarification
angle of rotation has special correction steering coil.

Focused camera carcass electron beam using compensate wafers
arises along the axis of the pipes. So the electric
I record the throne beam with floodlight
in its cross section is selection mark included in the address
system consisting of two pairs of deflecting plates that guides it
to the appropriate location on the target. The target represents
a fine-grained mesh coated on the side of
hector with a dielectric layer. It is located in parallel
screen a few millimeters from it.

Electrons of a recording searchlight bombard
target with a speed of 3 square meters. Since in this case c> 1, the potential
the number of bombed areas increases
decreases and reaches an equilibrium value, approximately equal to
collector potential (- + 200 V). So on the target
potential relief in the form of corresponding
signs. `

In addition to the recording, there is also a reading in the handset
spotlight, which is mounted on one of the address pla-
steen. This spotlight creates a wide beam of slow
electrons that irradiate the entire target. Moreover, in those
places of a target where there is no recording, electrons meet

 

Fig. 38. Screen typotron image matrix

field and therefore are reflected from it. In the same places
where there is a record, the electrons hit the accelerating
field. As a result, in places where there is no record. electrons _ not
will pass through the target grid, and wherever there is a record, they
pass through target cells and under
by an accelerating field of 3 kV, they reach the screen,
sign icon. The brightness of the image niya is about 9 mb.

To erase recorded information. need to
lower the voltage on the collector grid. Moreover, under
action of electrons of a reading searchlight potential
target elements will also decrease potential relief will be erased.

The disadvantage of the described type of typotron is complexity
adjusting and adjusting the focusing coil. therefore
attempts have been made to create a similar tube with
simpler control system. To this end, in the USA
a typotron was created, in which the microarray with size
Rum side 0.3 mm with 63 characters set directly
in the recording electronic spotlight and electric
the electram irradiates the entire matrix at once. Via
electronic beam systems this full-beam bundle
characters in the cross section is reduced to the center of deviation
picking plates. Between pick plates and
the address system placed a metal plate
a hole in the center equal to 0.1 mm. Such a hole is capable of
skip only one character. The choice of character is carried out
by supplying the appropriate voltages to the selecting pla-
stins. Thus, with this method of selecting characters,
which is called aperture selection,
The use of the compensation plate system has disappeared.
This greatly simplified handset management and allowed
cut its length.

The first samples of tympotrons used in America
canal equipment SAGE a screen diameter of 100 mm.
Currently, there are tympotrons with diameters in the USA.
From screen 30 and 50 cm.