摘要:
Tube à rayons cathodiques, muni de moyens de déflexion électrostatique (12,13) du trajet d'un faisceau d'électrons ef issus d'une source d'électrons (11), lesdits moyens de déflexion comprenant au moins un photodéviateur électrostatique (20,21,22,24) incluant un photodétecteur (24) qui, sous l'action d'un rayonnement lumineux incident, créé des charges électriques e p qui modifient le champ électrique de déflexion du photodéviateur. Le photodéviateur peut être réalisé avec trois (20,21,22) ou deux (20,22) électrodes de sorte que le faisceau d'électrons e f et les charges électriques e p générées se situent ou non dans le même espace. Le photodétecteur peut être une photocathode (24) ou une photodiode (40). La structure peut être répétitive pour réaliser un photodéviateur distribué le long du trajet du faisceau d'électrons e f . Le tube à rayons cathodiques peut permettre de réaliser un oscilloscope.
摘要:
A colour display tube (1) which comprises a display window (3), an emission system for emitting an emission pattern of electron beams (4 and 7) which comprises juxtaposed rows, deflection electrodes 12 for deflecting electron beams situated between the generation-modulation system and the display screen, a single deflection electrode extending between adjacent rows of the emission pattern and the deflection electrodes being alternately connected together electrically, and a phosphor pattern (13-15) correlated with the emission pattern and provided on the display window. Each row of the pattern extends asymmetrically between the deflection electrodes extending on each side hereof.
摘要:
In an electromagnetic focusing electrostatic type image pick-up tube the electrostatic deflecting electrodes (5) formed on the inner surface of the tube (1) consist of 2 pairs of electrodes. Each of these electrostatic deflecting electrodes (5) has a zig-zag shape from the electron gun (7) towards the target (3). This zig-zag shape is twisted in the circumferential direction around the axis of the tube (1) and variation rates of this twist amount are different, depending on the position in the axial direction.
摘要:
A steak tube has a container 2 with an entrance plate 2a and an output plate 2b, a photocathode 7 disposed in the container 2 and configured to emit electrons according to light to be measured, the light having been incident through the entrance plate 2a, and a sweep electrode 10 disposed in the container 2, having a pair of deflection plates 11, 12 for generating an electric field and a connection lead 13 connected to each deflection plate 11, 12, and configured to sweep the electrons in a sweep direction along the output plate 2b. An opposing of edges 11a, 11b of the deflection plate 11 in a direction of the output plate 2b are formed so as to extend in a direction from the entrance plate 2a to the output plate 2b, the connection lead 13 has a first connection portion 13a electrically connected to the deflection plate 11, and the first connection portion 13a is connected to the opposing of edges 11a, 11b.
摘要:
An electron beam deflection structure (10) of the traveling wave type effectively cancels the longitudinal voltage gradients and the associated electron beam defocusing that are characteristic of such deflection structures. The deflection structure comprises a first helical coil member (48) and a second helical coil member (50) that are coaxial with the longitudinal axis (26) of the tube. Each of the coil members has wide and narrow segments which alternate along the length of the coil in sequence with the turns of the coil. The first coil member has its wide segments (92a) positioned on the bottom and its narrow segment (92b) on top of the coil member. The second coil member has its wide segments (94a) positioned on top and its narrow segments (94b) positioned on the bottom of the coil member. The narrow segments from one of the coil members are interleaved with the wide segments from the other coil member. A pair of linear arrays (100) and (102) are thereby formed which are positioned above and below the electron beam path and comprise wide and narrow segments from different coil members. Differential voltage signals of opposite polarity are applied to the first and second coil members of the deflection structure. Longitudinal voltage gradients along the wide segments are compensated by substantially equal but opposite voltage gradients on the narrow segments, thereby effectively canceling the longitudinal voltage gradients and eliminating any defocusing of the electron beam that the voltage gradients would cause.
摘要:
The disclosure relates to an apparatus and method for forming a scanning electron beam for use in a flat screen cathode raytube device. An analog addressing method enables scanning of one axis of the screen of the CRT device. During scanning, all portions of a sheet of electrons emitted by a line cathode 18 are deflected at any given time and blocked by an analog horizontal-positioning deflection grid 20 except for one narrow portion disposed along the length of the line cathode. At the one portion, a narrow beam of electrons is formed. The grid contains an address plate 22 and a load plate 23. The load plate creates a voltage gradient causing each location along its horizontal axis to be at a distinct voltage. Horizontal scanning is accomplished by applying a varying central voltage to the address plate. This varying voltage will be matched by an equal voltage at a single predetermined location along the horizontal axis of the load plate adjacent to which electrons can pass undeflected in the form of a beam. At all other locations along the horizontal axis, unequal voltages on the plates deflect electrons in the sheet passing between them and cause the electrons to be blocked. Vertical scanning is accomplished by varying the voltage difference between two parallel vertical deflection plates (11, 12) between which the scanned electron beam passes. The disclosure also relates to the use of electromagnetic rather than electrostatic deflections in producing a scanning electron beam from a line cathode. In addition, the disclosure relates to multiple beams for scanning and producing of color images.
摘要:
In small, flat in-line display tubes having a screen of the order of 75 mm diagonal it is important to be able to deflect the electron beam, say in the frame direction, along paths which are accurately parallel to each other in order to make the subsequent beam deflection processes easier. In order to do this the display tube includes an electron beam deflector comprising first and second electrode arrangements (30, 40) arranged successively along the electron beam (13) path from an electron gun (14). Each electrode arrangement comprises a pair of resistive plates (31, 32 and 41, 42) extending transverse to the path of the electron beam path and disposed laterally one on each side of the path. The plates (31, 32 and 41,42) of each electrode arrangement (30, 40) are joined at their top and bottom ends and a potential difference is applied across the plates to provide electrical fields (E) substantially normal to the electron beam path from the electron gun (14). The effect of the fields (E) provided by the respective electrode arrangements (30, 40) on the electron beam are equal and opposite so that the angular deflection (a) of the electron beam caused by the first electrode arrangement (30) is cancelled by the second electrode arrangement (40) and the electron beam (13) leaves the electron beam deflector on a path parallel to (or coincident with) the path it entered the deflector. In order to ensure that no additional angular deflection of the electron beam occurs when it crosses the interface between the first and second electrode arrangements (30, 40), the voltages (Vt2 and Vb2) applied to the second electrode arrangement are varied so that the point (B) of entry of the electron beam is at an equipotential with that of the beam. Other electrode arrangements are disclosed together with an embodiment of a flat display tube.
摘要:
An electron beam device (10) has a cathode (34) that generates a fan-shaped electron beam. A first focusing lens (44, 46, 48, 50) includes first (48) and second (50) plates on opposed sides of a filament. The edges of the plates closest to a positively charged anode (20) are arcuate, so that as individual electrons are accelerated normal to the edge of the charged plates, the beam (60) increases in length with departure from the filament. A second focusing lens includes third (44) and fourth (46) plates on opposed sides of the first focusing lens. Each of the third and fourth plates has an arcuate edge proximate to the positively charged anode. The plates of the first and second focusing lenses provide focusing in a widthwise direction, while defining the increase in the lengthwise direction. The curvature of the plates of the first focusing lens defines a common radius with the plates of the second focusing lens.