CS225231B1 - Device for cooling of target plate of the vidicon - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for cooling a decay electrode of a vidicon that is incorporated into a pickup tube system.

If it is necessary to cool some tubes, either air cooling is used, using fin coolers, as in the case of NSR-DT 1911770 03, for example, or more efficient cooling by flowing cooling medium in the cooling _; dic, which cools the vacuum tube from the outside. This method is, however, more technologically and operationally demanding, and the pickup tubes cause further difficulties in this type of cooling, which need to be solved, which is the risk of condensation of the entrance window. Because of these and other cooling problems associated with this, the sensor tubes usually cool down. However, this results in, for example, silicon vidicons that the return currents in the dark increase with increasing temperature, thereby proportionally deteriorating the vidicon parameters.

The above drawbacks are overcome by the inventive electrode decomposition electrode cooling apparatus by cooling / utilizing the direct contact of the electrode circuit with a cooling circuit vacuum-embedded in the expanded end of the glass sheath, wherein the cooling circuit is attached to the decomposition holder by a thermal joint. an electrode which is conductively connected to the holder at several points of the edge of the target electrode or the entire surface of the annulus, for example in the case of a silicon target electrode, a reinforced edge annulus of the electrode plate could be used. The opening in the annulus of the holder must be designed so that it does not restrict the beam inlet to the photosensitive surface of the target. The electrical contact of the decomposition electrode with the metal sleeve can be made, for example, by a flexible lead made of a metal strip or a spiral spring. Mechanically possible holder with folding z

225 231 electrode can be attached to a loop of a cooling circuit made of, for example, a glass or other suitable, for example, metal tube. The inlet and outlet of the coolant circuit is vacuum sealed in the expanded end of the glass tube of the pickup tube. The thermal bonding of the decay electrode holder to the coolant circuit is made of any thermally conductive sealant, such as a colloidal silver dispersion. Conventional cooling medium, preferably alcohol mixtures, or mixtures with polyhydric alcohols cooled, for example, with dry ice, may be used for cooling, such that the temperature of the cooling medium is about 0 ° C, or even lower.

The inventive cooling electrode cooling apparatus according to the invention not only allows to prevent an increase in the reverse current in the dark, but also to reduce the reverse current level below room temperature. For example, in the case of a silicon target, a 10 ° decrease in the dark in half. In this way, it is possible to increase the sensitivity in low light and to extend the dynamic range of image signal processing. Such modified vidicons allow to detect video signals corresponding to illumination of several hundredths to thousandths of lux.

A further advantage of the inventive electrode cooling apparatus is the relatively simple construction and especially the advantageous operating conditions, since bulky auxiliary devices are eliminated, since the cooling is located inside the tube, built into its system. There is also no risk of condensation of the entrance window, since only the scanning electrode is cooled, so that the cooling of the vacuum tube surface is negligible. Also, the consumption of the coolant is minimal, with respect to appearance. to a low weight of the target, especially when it is a silicon target and since it is a vacuum cooling.

1 to 3 illustrate the arrangement of a device for cooling the degradation electrode of a vidicon according to the invention, in a silicon scanning electron.

Fig. 1 is an overall view of a silicon pickup tube incorporating a quench electrode.

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The glass sheath 1 of the pickup tube is expanded at its end at the location with the cooling device. The anode 2 of the pickup tube is of conventional production. The inlet window 3 is connected to the casing 1 by an indium ring 4 through which a flexible lead 6 passes to the sleeve 5. The mechanical strength of the attachment of the inlet window 3 to the glass shell 1 is ensured by an araldite seal 7. » 8 of a silicon target electrode 9, which is conductively connected to the holder 8. The holder 8 is fastened to a cooling circuit 11 by a thermal connection 10 made of colloidal silver, the inlet 1, 2 of the outlet 13 being sealed into the housing 1.

FIG. 2 shows an enlarged detail of FIG. 1. In this detail, the arrangement of the flexible lead 6 ' of other parts, the design and designation of which is identical to FIG.

FIG. 3 shows the inlet 12 and outlet 13 of the cooling circuit 11 and the way through the glass tube 1 of the vacuum tube.

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Claims (1)

A device for cooling a Vidicon scanning electrode embedded in a Vidon tube system, characterized in that it consists of a cooling circuit (11) vacuum built into the expanded end of the sensor tube glass (1), wherein the cooling circuit (11) is by means of a thermal joint (10). attached to the holder (8) of the target (9), which is conductively connected to the holder (8).