DE1537156A1 - Image dismantling tube - Google Patents

Description

Patent attorney

Stuttgart-1

Botefcühlstr. 70

ISE / Reg. 3686 HHClayton - 8

HTEEHAIIOITAL STANDARD ELECTSIC COBPOEAIION NEW YORK

Image decomposition tube

The priority of filing in the United States of America dated June 5, 1966 Ur.562,773 is used.

The invention is concerned with an imager tube and in particular with such a tube that uses a combination of magnetic focusing and electrostatic deflection for line scanning used to provide a more compact device with high resolution and quick response time.

Image decomposition tubes that generate an electrical signal which sequentially scanned parts of an image or a Scenes of different intensities are used for room surveillance and for the optical feed of computers. In general it is desirable to magnetically focus the tube for high resolution. However, the conventional magnetic deflection coils are considerable in weight and require one high "power, so a universally magnetic tube not for all use cases satisfied. In addition, the electrostatic results Distraction a faster response time »if a high Line number is required. It is therefore the first object of the invention to provide an image decomposing tube which is magnetic Focusing and electrostatic deflection for line deflection used to provide a more efficient arrangement with improved operating characteristics.

This is achieved in a new tube arrangement in that

3.7.1967

Dr.Hi / ü --... "2 -

909834/0667 bad

this tube has magnetic focusing coils which extend axially around the tube envelope between the photocathode at one end and an electron multiplier at the other end, a set of magnetic deflection coils around the front part of the tube between the photocathode and a first diaphragm for vertical deflection for slower image changes and a pair of horizontally extending electrostatic deflector plates between the first aperture and a second aperture located adjacent the electron multiplier are used for horizontal deflection for high line scanning. The axial magnetic field generated by the focusing coil and the electromagnetic field generated by the horizontally arranged deflection plates result in a cycloid path for the electrons , which results in the horizontal scanning of the electron image over the second diaphragm. The first aperture is in the form of a horizontal slit to give a sharp resolution in the vertical direction for the image scanned by the vertical deflection coils. The second aperture is in the shape of a vertical slit to give sharp resolution in the horizontal direction and the phase shift in the vertical direction caused by the length of the "electrostatic" plates not being exactly an integer number of the focusing loops between the two apertures The invention, further features and further advantages thereof will be described in more detail with reference to the exemplary embodiments in the accompanying drawings:

Figure 1 shows a three-dimensional schematic view of the new Tube arrangement |

Figure 2 shows a three-dimensional view of the electron path under the influence of the magnetic focusing and the electrostatic deflection fields j

FIG. 5 schematically shows the relationship of the electron image of FIG first aperture also the second aperture.

In FIG. 1, an external image 10 or a scene is different Light intensity projected onto the photocathode 12, which is on the

909834/0667

inner surface of a faceplate at one end of the tubular envelope 14 is arranged. The photocathode emits electrons in accordance with the light image. A set of electromagnetic deflection coils 16 results in a relatively slow image change of the electron image in the vertical direction across the first opening in the transverse plate 20. The opening 18 is in the form of a narrow horizontal gap with a small vertical dimension in order to limit the resolution in the vertical direction create. Electrons passing through opening 18 are subjected to an electrostatic field E as indicated in FIG. This electrostatic field is generated by a pair of horizontal, preferably convex, baffles 22 which extend along the longitudinal axis _(of the tube and curved outwards. Simultaneously act

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on the electrons the axiaxe / field B of the focusing coils 24

a. As is known, the field created by the orthogonal fields in the Y and Z directions causes the electrons, one To follow cycloid trajectory which has a resulting vector along the Y "axis, thereby accomplishing the scan in the X direction will. The deflection in the X-axis takes place at right angles to the electrostatic deflection field E. The basic theory and the mathematical Relationship of this electron orbit can be found in "Electron Optics", by O. Klemper, published in 1953 by Cambridge University Press. The usual sawtooth-shaped deflection voltage, which fluctuates into an i'est DC voltage, is applied to the deflection plates placed and suitable potentials between the photocathode and the first aperture. This is the initial acceleration of the electrons eri'-icht. Sin field grid (not shown), which is close to the cathode is arranged, can also cause the acceleration.

The length of the plates along the tube axis is a compromise between the plate capacity, which increases with size and limits the frequency of the plate, and the deflection sensitivity, which is lower with shorter plates, since higher voltages are required. Jie plates can be siel: just a short distance from the first ~ len: ie 18 extend, but for maximum · sensitivity and

j they preferably extend-.bis.- to the second diaphragm 26, de :. Electron multiplier 28 1: cn achbar t is. The separation

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ISE / Reg. 3686 -5- 1527156 ■

be sufficiently long and have a positive voltage ± n ^r r s i \ £ the photocathode to collect all electrons that ^{go di 1} vb L. opening 32. The output signal is further fed into the multiplier by means of suitable potentials <* 'n ⁴ u ji to the various dynodes and then to any suitable citizen for use.

In some cases, "in which the vertical scanning outside voi * - is taken, e.g. moving a vehicle »which one? the tube rotates, the vertical deflection coils can be omitted. The first horizontal aperture is then in, its surface area replaced limited photocathode, the electrons of which are accelerated and deflected via the second aperture in the same way as described earlier.

The invention results in a new, compact, speedy appealing High resolution image decomposition tube. Although only a single embodiment is shown, the invention is not limited to this Embodiment is limited and many changes can be made without departing from the invention, such as it is described in the following claims.

3t claims

1 sheet numbered, 3 fig.

BAD GRiG'MAL 909834/0667 - 6 -

Claims (1)

β8β. -β- 15871 pp ®ia © siaea from dös? KatiiOfi © raid οώθγ aur LäagsaeJiras d © i? Eöte © mi · ea Blsade ®i's © iner Publmaag with IslsiiiQr Aöaesei r mid gross ©? Aliscigsiang ia horig © atsi © r ll aiis siaer Anoriaroag exit Afeleakuag d®s Elektsyaisnb file BIeMe in x ^? ertilsal® ^ lieMiing "consists of _a cladiirca marked that in © Ixiea AtetaM iron di © s®r diaphragm another, with an opening irerseiieae Blead © ₉ furthermore a pair of electrostatic deflection plates extending between these hot diaphragms, if axially electromagnetic coils extending around the tube envelope are seen and the electrostatic and magnetic fields cause the horizontal line deflection of the electron image via the second diaphragm and an output signal corresponding to the electrons passing through the second diaphragm is taken from the electron multipliers adjacent to this diaphragm. 2 »image splitting tube according to claim 1, characterized in that the electrostatic baffles are convex to the longitudinal axis of the ear and at each end to the horizontal edges of the Apertures converge. 3. Image splitting tube according to claim 1 or 2, characterized in that the opening of the second diaphragm has a small dimension has in the horizontal direction and a large dimension in the vertical direction. 4. image decomposition tube according to claim 2, characterized in that the electrostatic deflection field generated by the curved deflector plates along with that generated by the magnetic focusing coils Magnetic suffering generated a cycloid electron orbit results. 909 834/066 7 ISB / Eeg. 3686 '~ 7 - 1 5,371 ITß 5. Bllciaerlegerröiire, according to one of the claims ι to 4i "daduroii gekennsoiolinet that the elektrosiagneti.sc-lisn focus coils from the iOtofeathode to aur: - ^ eIt« n aperture ca ¹ - 6 »" ^J ild2 '~. Legerr-'U - ^ iach Αητ / ruoh! Uz. "'...:", - r --nu- ^ "I-,, da. Γ'ί f * trivienbi" · ä iß 'u ^iJ ', ^r . i: ' ^f ' i ire r