JPS5829558Y2 - Single tube color image pickup tube for television camera - Google Patents

Description

[Detailed description of the invention] The present invention is a signal extraction method that can be used in an image pickup tube in which multiple signal electrodes are incorporated into one image pickup tube, such as an image pickup tube for a three-electrode single-tube color television camera. This relates to structural improvements.

For single-tube color camera image pickup tubes, a plurality of signal electrodes are incorporated into one image pickup tube.

For example, as shown in FIG. 1, a button for a three-electrode tube color camera image pickup tube uses a face plate having a basic structure as shown in FIG. 2.

FIG. 2a is an exploded view thereof, and FIG. 2a is a plan view thereof.

Striped color filters 8 of three colors red, green, and blue are formed on the glass substrate 1, and striped transparent electrodes 9 are formed on the color filters 8 in correspondence with the color filters 8. This transparent electrode 9 is wired for each color, red,
The contact portions 4 for green and blue are respectively drawn out.

A photoconductive film 5 is deposited on transparent electrode 9 .

Three lead-in wires 2 are embedded in the upper end of the pulp 7 containing electrons, aligned accurately with the contact portions 4, and sealed with an indium ring 10.

At this time, the lead-in wire 2 and the contact portion 4 are connected by the spring 3, and the signal is taken out to the outside.

Kovar, Dumet wire, etc. are usually used for the lead-in wire 2 embedded in the upper end of the pulp 7, but the wall thickness of the image pickup tube pulp is generally about 1.0 to 2.0 mm, so the embedded part is made convex. However, the thickness is in the order of 2 to 5.

For this reason, for an imaging tube that is basically designed to maintain a high vacuum, there is a limit to the wire diameter of the implantable lead-in wire, which is 0.3 to 1.0 mm.

When such a thin wire is embedded in glass, as shown in FIG. 3, the contact area 11 between the pulp 7 and the lead-in wire 2 is a so-called glass-to-metal phenomenon in which the glass thinly extends along the lead-in wire 2. wake up

For this reason, when indium sealing the face plate 1, the face plate 1
When the stress caused by the spring 3 between the contact portion 4 and the lead-in wire 2 is applied to the contact portion 11 of the lead-in wire 2 with the glass, the glass thin film of the contact portion 11 described above cracks and becomes glass fragments that are scattered around.

Incidentally, as the spring 3 serves as an image pickup tube, it is inevitable that a certain degree of stress is applied to the spring 3 in order to obtain a stable signal.

The aforementioned glass pieces are about 5 to 50 μm in size, but if a conventional linear spring 3 as shown in FIG. Damage to or adhesion to these causes spot scratches on the image, degrading the image quality.

The conventional spring 3 has a shape in which a wire having spring properties is spot-welded to the lead-in wire 2 and brought into contact with the contact portion 4, as shown in the example of FIG.

In a single image pickup tube that requires multiple signal electrodes from one image pickup tube, the signal needs to be extracted from a location as close to the contact area as possible from the perspective of stray camber, but generally the signal electrodes are located on the face plate. 2 from Kara and Valve
There is a way to take out the street.

The present invention relates to removal from a valve.

When taking out signal electrodes from pulp, embedding lead-in wires inevitably includes factors that are likely to generate glass fragments, as described above.

At the same time, if the spring strength is weak, the vibration of the image pickup tube will cause noise and degrade the image quality, so it is preferable that the spring strength be strong within the range of elastic deformation.

Under such conditions, scattering of glass pieces is unavoidable.

Therefore, preventing spot-like scratches by preventing glass fragments from hitting the photoconductive film and the mesh electrode leads to improved image quality.

By using a plate-shaped spring, the present invention uses a plate-shaped spring, so that when glass fragments are scattered due to a crack at the contact part of the lead-in wire with the glass, the plate surface of this plate-shaped spring acts as a barrier and prevents photoconductivity. It is characterized by being able to significantly reduce the probability of hitting or adhering to the membrane or mesh electrode, and its purpose is to simplify the installation of the spring and improve the installation accuracy.

・7 Examples of the plate spring according to the present invention will be explained with reference to FIGS. 5 and 6 a, b, and c.

Figure 6a shows the structure of the plate-shaped spring 3', which can be used in a system where each spring is attached one at a time. When taking out the plate springs 3', as shown in Figure 6, the plate springs 3' can be press-formed into three consecutive pieces, spot welded to the lead-in wire 2, and then cut out to facilitate the installation of the plate springs 3'. .

In addition, as shown in FIG. 6C, if the spring plate width is covered with a resilient insulating material 12 such as polyimide quinodalline resin, except for the contact portion with the contact portion 4 and the welded portion with the lead-in wire 2, the width of the spring plate can be reduced. It is also possible to expand the springs, and when constructed as in the example shown in Figure 5, it is possible to completely eliminate the gap between the plate springs 3' and make them continuous, which further increases the effectiveness of the present invention in preventing glass scattering. .

When welding the plate spring 3' to the lead-in wire 2, spot welding is easy in the conventional type shown in Fig. 4 because the spring 3 is a wire rod, but when implementing the present invention, the plate spring 3' is fixed. As shown in Figure 6a, the mechanism for
By making the lower part of the plate spring 3' eyelet-shaped or U-shaped as shown in Fig. 6C, it is possible to make the installation easier. After installing the spring 3' to the wire 2, the overall length is also the same, making the contact even more stable.

Furthermore, by making the upper end of the plate spring 3', which contacts the contact portion 4 of the face plate 1, spherical as shown in 13 in Fig. 6a, the slippage of the contact portion with the contact portion 4 is prevented when indium sealing is performed. As explained above, according to the present invention, by replacing the conventional linear spring with a plate spring, By using a spring with the shape shown in Figure 6, it is possible to prevent glass fragments from hitting the photoconductive film mesh electrode in the scattering path of glass fragments, thereby preventing spot-like scratches and improving image quality. It is possible to easily attach the spring to the wire and improve the attachment accuracy.

The present invention is effective not only for image pickup tubes for three-electrode single-tube color cameras, but also for image pickup tubes that require the extraction of a plurality of signals, such as phase and frequency separation type single-tube color camera image pickup tubes.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the structure of an image pickup tube for a three-electrode single-tube color camera, Figures 2a and b are diagrams showing the structure of the face plate of an image pickup tube for a three-electrode single-tube color camera, and Figure 3 is a glass 4 is a sectional view showing an embodiment of a conventional signal extraction section; FIG. 5 is a sectional view showing an embodiment of the signal extraction section of the present invention; FIG. 6 is a structural diagram showing an embodiment of the spring shape of the present invention. 1...Face plate, 2...Introduction line, 3'...
... Plate spring, 4 ... Contact portion, 5 ... Photoconductive film, 6 ... Mesh electrode, 7 ... Bulb, 10. ... Indium ring, 11 ... Spring upper end contact part, 12 ... Insulating film.

Claims (1)

[Claim for Utility Model Registration] 1) Connecting a plurality of lead-in wires for signal extraction embedded in the tube side wall of a single-tube color television camera image pickup tube to a plurality of contact portions of the image pickup tube face plate, respectively. The plurality of contact springs are plate-shaped springs, and the welded portions of the lead wires are tome-shaped or equivalent, the contact portion with the contact portion is spherical, and these are arranged in the shape of a barrier along the side wall of the tube. An image pickup tube for a single-tube color television camera, characterized in that the tubes are arranged side by side. 2) The above-mentioned plate-shaped spring is a plate-shaped spring having an insulating coating film applied to the parts other than the lead-in wire welding part and the contact part with the above-mentioned contact part. An image pickup tube for a single-tube color television camera according to item 1. 3) The single-tube color television set as claimed in claim 2, wherein the plurality of plate-shaped springs are arranged without gaps along the side wall of the tube via the insulator coating film. Image tube for camera.