JPH01149340A - Image pickup tube - Google Patents

Abstract

PURPOSE:To enable image picking up over a wide range of X-ray wave-lengths and provide possibility of a wide scope of utilization such as image picking-up which requires sensitivity even with impaired resolution by using a photo- conductive surface, interposing fluorescent substance between a Be plate and a film type glass sheet, and thereby constituting a face plate. CONSTITUTION:An image pickup tube is composed of a Be plate 1, film type glass sheet 2, photo-conductive surface 3, fluorescent substance layer 45 interposed between the Be plate 1 and glass sheet 2. When X-rays from the Be plate are irradiated, the fluorescent substance layer 4 emits light, and the output image is photo-electrically transduced by the photo-conductive film 3 and can be taken out as television picture. When the X-rays are irradiated to the photo- conductive film 3, on the other hand, the X-ray image is taken out directly as television picture. This enables a wide scope of observation such as image picking-up which allows image picking-up over a wide range of X-ray wave- length and which requires sensitivity even with impaired resolution.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an X-ray imaging tube that directly captures an X-ray image.

[Summary of the invention]

The present invention is capable of imaging over a wide range of Xfi1 wavelengths.
It is also characterized by the addition of phosphor to the nine-sided plate structure, with the aim of providing an image pickup tube that can be used in a wide range of applications, such as imaging that requires sensitivity even if the resolution is poor, and imaging that requires resolution rather than sensitivity. be.

[Conventional technology]

Conventional image pickup tubes for directly taking X-ray images include those using a photoconductive surface &'lbO or S e -A s sensitive to X-rays. FIG. 2 shows an example of the face plate structure of a conventional image pickup tube. 1 is X! A metal Be plate is used to maintain transmission and vacuum tightness, and 2 is a glass thin film designed to prevent scratches during processing of the photoconductive surface. 3 is S e - sensitive to XIJ
A s photoconductive film. Although the S e -A s photoconductive film has no problem in resolution, it is inferior to the sensitivity 7)b and o.

For this reason, resolution is the main objective, and although it can be used for measuring X-rays within the 5e-As sensitivity, the range of use is limited for measurements outside the resolution.

[Problem that the invention seeks to solve]

This is a custom order required for image pickup tubes in this field.

Sensitivity, resolution and X? The fM wavelength range may be wide. On the other hand, an image pickup tube using a B6IO, 5e-As photoconductive surface has a problem in resolution in the former case and in sensitivity in the latter case.

In both cases, the wavelength range is determined by the characteristics of the photoconductive surface.

From the above, conventional image pickup tubes have the drawback of being limited in the field of use.

[Means for solving problems]

In order to solve the above problems, the present invention includes a face plate structure used in an image pickup tube using a photoconductive surface sensitive to X-rays, in which a phosphor is inserted between the Be plate and the thin glass plate.

[Effect]

As a result, when X-rays are incident from the Be plate, the phosphor layer emits light. This emitted image is photoelectrically converted by a photoconductive film. That is, when X-rays are incident, they are converted into visible light by the phosphor and then photoelectrically converted by the photoconductive surface, and converted directly by the photoconductive surface.

〔Example〕

The face plate shown in FIG. 1 is the face plate structure of the present invention. 1 is a Be plate, 2 is a glass plate, and 3 is a photoconductive surface. 4 is a phosphor layer used between the Be plate and the glass plate. As for the operation of this imaging tube, when X-rays are incident from the Be plate, the phosphor layer 4 emits light. This emitted image is photoelectrically converted by the photoconductive film 2 and can be taken out as a television image. On the other hand, X
When the rays are incident on the photoconductive film 2, this X-ray image can also be taken out directly as a television image. In short, X#i! When incident, it is converted into visible light by the phosphor and photoelectrically converted by the photoconductive surface, and 2 is directly converted by the photoconductive surface.
It is a structure that takes into consideration the conversion of weight.

Next, a method for processing a face plate according to the present invention will be described.

A phosphor suitable for the purpose is applied to the surface of the Be plate 10 by vacuum evaporation, electrodeposition, or precipitation. The phosphor is granular.

Select by considering sensitivity etc.

Next, a thin (polished) thin film glass is attached on top of this phosphor. The glass plate is adhered with an adhesive such as epoxy resin. A photoconductive film 3 is vacuum-deposited on this glass plate 2. The body layer can be formed not only by directly coating the Be plate but also by bonding a plate that emits X-rays such as a fluorescent plate.

Although this embodiment has been described using a Be plate, it is also possible to use an AI plate when CsI is used as the phosphor.

〔Effect of the invention〕

As described above, by using the image pickup tube according to the present invention, it is possible to capture images over a wide range of X-ray wavelengths, and also for a wide range of observations such as imaging that requires sensitivity even if the resolution is poor, and imaging that requires resolution rather than sensitivity. We can supply television cameras that are capable of

[Brief explanation of the drawing]

FIG. 1 is a structural diagram of a face plate showing an embodiment of the present invention. Second
The figure is a structural diagram of a conventional face plate. 1: Metal Be plate, 2: Thin glass plate, 3: Photoconductive film, 4
: Phosphor layer agent Patent attorney J. Ogawa, 〒 □ ,,′− ＼＼−−−.

Claims (1)

[Claims] 1. An X-ray imaging device characterized in that a phosphor is provided between a Be plate and a thin glass plate in a face plate structure used in an image pickup tube using a photoconductive surface sensitive to X-rays. tube. 2. An image pickup tube made by providing a phosphor on the surface of a Be plate, attaching a thin, polished thin film of glass on top of the phosphor, and vacuum-depositing a photoconductive film on the glass plate.