JPH0222932Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to an image pickup tube.

BACKGROUND TECHNOLOGY AND PROBLEMS In image pickup tubes, it is desirable to have a compact and simple structure, and to suppress deformation due to aging and temperature changes, the focal point of the lens system is always on the imaging surface (photoelectric conversion surface) of the image pickup tube body. ) is required to be tied correctly.
In particular, in the case of a dedicated imaging device, since it does not have a playback monitor, the imaging tube must be assembled more accurately to avoid distortion due to regular changes or temperature changes.

FIGS. 1, 2, and 3 are a front view, a cross-sectional view, and a configuration diagram showing an integral assembly of the image pickup tube and lens system, respectively, showing an example of a conventional image pickup tube. In the figure, reference numeral 1 denotes an image pickup tube body that includes a photoelectric conversion surface, an electron gun, etc. inside the tube. Reference numeral 2 denotes a metal ring attached to the outer periphery of the front end of the image pickup tube body 1 via indium for cold sealing, and a predetermined voltage is applied to the mesh-shaped electrode inside the tube via this metal ring 2. Reference numeral 3 denotes a metal electrode for signal extraction which penetrates the face plate of the bulb and comes into contact with the photoelectric conversion surface.
This image pickup tube body 1 has a bobbin 4 made of a resin molded product.
The metal ring 2 is inserted into the bobbin 4, and the metal ring 2 is brought into contact with the standard stepped surface 4a in the bobbin 4, and is pressed from the front side by a fixing member, that is, a so-called top block 6, via an elastic ring 5 made of rubber or the like. Fixed.
7 is a scientific low-pass filter disposed opposite to the face plate of the image pickup tube body 1, and 8 is an infrared cut filter. A focusing coil assembly 10 is attached to the outer periphery of the bobbin 5 so as to be positioned by the flange portion 9 thereof, and a magnetic shielding cylinder 11 made of, for example, Pamalloy is fitted onto the outer periphery. The image pickup tube 12 configured in this way is
As shown in FIG. 3, the bobbin 4 is inserted into a cylindrical chassis 13 made of die-cast aluminum, and the flange portion 9 of the bobbin 4 is inserted into the reference receiving surface 1 of the chassis 13.
4, and the rear end surface of the bobbin 4 is pressed in the tube axis direction by a fixing spring 15 to be fixed. A lens system 14 is arranged in front of the chassis 13 and adjusted so that its focal point is focused on the imaging surface (photoelectric conversion surface) of the image pickup tube 12.

However, in such a conventional image pickup tube 12, the image pickup tube main body 1 is pressed against the stepped surface 4a of the bobbin 4 via the top lock 6, and the image pickup tube 12
The chassis 13 is fixed by a fixed spring 15.
Because force is constantly applied in the direction of the tube axis, such as when the bobbin is pressed against the reference receiving surface 14 of the bobbin 4, deterioration is likely to occur over time. Since the distance l ₁ is long, thermal deformation due to temperature changes is likely to occur, and as a result, the position of the image forming surface of the image pickup tube 12 is likely to be misaligned. Furthermore, by fixing the image pickup tube body 1 to the bobbin 4 with the top lock 6, the distance from the front end surface of the bobbin 4 to the face surface of the image pickup tube body becomes long, and the radial size is also restricted, making it possible to reduce the size. It was difficult to

Purpose of the invention In view of the above-mentioned points, the present invention provides an image pickup tube that can reduce the deviation of the imaging plane (displacement in the tube axis direction) due to changes over time and temperature, and can be made smaller and simpler as a whole. It is something.

Summary of the invention In this invention, the image pickup tube body with the front bobbin fixed integrally is housed in a magnetically shielded case, and the flange of the front bobbin is held between the annular body arranged on the back side and the flange of the magnetically shielded case. This is an image pickup tube configured to hold an image pickup tube main body by being fixed to the image pickup tube.

In the image pickup tube of this invention, deviations in the imaging plane due to changes over time and temperature are extremely small, and the structure can be made smaller and simpler.

Embodiment An embodiment of the image pickup tube of the present invention will be described below with reference to FIGS. 4 to 9.

The image pickup tube body 1 has the same configuration as described above, and includes a photoelectric conversion surface, an electron gun, etc. inside the tube.
It also has a metal ring 2 and a metal electrode 3 at its front end. In this example, first, as shown in FIG. 5, a front bobbin 22 is provided, which is a resin molded product having a cylindrical shape and integrally having a flange portion 21 at its front end. In this case, the flange portion 21 has, for example, a plurality of notches 23 at equal angular intervals, three in this example.
Further, the rear end of the cylindrical portion 24 has a plurality of positioning notches 25 (two in this example). Further, inside the cylindrical portion 24, a stepped portion 26 against which the front surface of the metal ring 2 of the image pickup tube body 1 abuts, and a protrusion 28 for positioning an optical low-pass filter, etc. 27 are integrally formed (see FIG. 9). ). The front bobbin 22 may be made of a hard resin such as a polyphenylene oxide resin (manufactured by Asahi Kasei Corporation, trade name: Zylon). This front bobbin 22 is fitted to the front end of the image pickup tube body 1 so that the metal ring 2 and the stepped portion 26 of the front bobbin 22 abut each other, and as shown in FIG. mechanically fixed together.

On the other hand, as shown in FIG.
A metal annular body 30 integrally having three protrusions 29 is provided corresponding to the notch 23 of. Each of these protrusions 29
A screw hole 31 is formed in the upper surface of each of the two. This metal annular body 30 can be formed by die-casting aluminum, for example. In this case, the height t ₁ of the protrusion 29 is smaller than the thickness t ₂ of the flange portion 21 of the front bobbin 22. This metal annular body 30 is imaged. It is inserted from the rear of the tube body 1, and the end surface 30a of the annular body 30 is abutted against the back surface 21a of the flange portion 21 so that the protrusions 29 of the annular body 30 fit into the notches 23 of the front bobbin 22, respectively.

Next, as shown in FIG. 7, a focus coil assembly 34 consisting of a coil 33 wound around the outer periphery of a coil bobbin 32 is inserted from the rear of the image pickup tube body 1. At this time, an engaging portion (not shown) formed at the upper end of the coil bobbin 32 engages with the notch 25 of the front bobbin 22, and the coil assembly 34 is positioned. Further, a magnetic shielding case 35 made of permalloy or the like is inserted from the front of the image pickup tube body 1, and the flange 37 of the shielding case 35 and the metal annular body 30 are connected to each other via screws 36.
Tighten and combine. Note that the screw 36 is screwed into the screw hole 31 of the metal annular body 30 through the through hole 38 of the flange portion 37 of the shield case 35. At this time, the flange portion 21 of the front bobbin 22, which is integral with the image pickup tube body 1, is clamped and fixed by the metal annular body 30 and the flange portion 37 of the shield case 35, and the image pickup tube body 1 is held. In this case, as a matter of course, the end surface of the flange portion 21 of the front bobbin 22 abuts against the inner surface of the flange portion 37 of the shield case serving as a reference. Further, when the shield case 35 is inserted, the elastic claw piece 39 provided on the coil bobbin 32 of the coil assembly 34 engages with the hole 40 of the shield case 35, and the position of the shield case 40 is determined. In this way, the eighth
As shown in FIG. 9 and FIG. 9, an image pickup tube 4 according to the present invention
1.

As shown in FIG. 4, the image pickup tube 41 is further inserted into a cylindrical chassis 42 made of, for example, aluminum die-casting, and is tightened from the front side thereof with a screw 44 through a fixing plate 43 made of, for example, aluminum. Fix it in place inside. A lens system 45 is fastened to the front end of the chassis 42.
The lens system 45 is finely adjusted so that its focus is on the imaging plane of the image pickup tube 41, and then fixed.

According to the image pickup tube having such a configuration, the front bobbin 22 is integrally fixed to the image pickup tube body 1 with a predetermined positional relationship, and the flange portion 2 of the front bobbin 22
The image pickup tube body 1 is held by clamping and fixing the image pickup tube body 1 between the metal annular body 30 and the flange portion 27 of the magnetic shielding case 35.

In this case, since the thickness t ₂ of the flange portion 21 of the front bobbin 22 to be held is small, the deformation due to aging and temperature changes in the tube axis direction is suppressed to an extremely small level and can be ignored. Furthermore, the image pickup tube 41 is fixed to the chassis 42 by tightening from the side via a fixing plate 43, instead of applying pressure in the tube axis direction as in the conventional case. Therefore, in this image pickup tube, the deviation of the imaging plane (displacement in the tube axis direction) due to changes over time and temperature can be suppressed to a sufficiently small level.

Further, since the distance from the flange portion 37 of the magnetic shielding case 35, which serves as a reference plane, to the imaging plane is shortened, the size is reduced and the structure is also simplified.

Effects of the Invention According to the invention described above, the front bobbin is integrally fixed to the image pickup tube body, and the flange portion of the front bobbin is clamped and fixed between the annular body and the flange portion of the magnetic shielding case to secure the image pickup tube body. Since it is held, the deviation of the imaging plane due to changes in the tube axis direction over time and temperature changes is reduced. Furthermore, since the distance from the flange of the magnetic shielding case, which serves as a reference plane, to the imaging plane is shortened, the size of the image pickup tube can be reduced.

Therefore, it is particularly suitable for application to a dedicated imaging machine without a playback monitor.

[Brief explanation of the drawing]

Figures 1 and 2 are a front view and a cross-sectional view of the main parts of an example of a conventional image pickup tube, Figure 3 is a configuration diagram of the image pickup tube and lens system assembled together, and Figure 4 is a diagram of the present invention. Figures 5 to 7 are perspective views of the order of assembly steps for the image pickup tube of the present invention, and Figures 8 and 9 are examples of the image pickup tube of the present invention. FIG. 2 is a front view and a sectional view thereof. 1 is the image pickup tube body, 22 is the front bobbin, 30
34 is a metal annular body, 34 is a coil assembly, 35 is a magnetic shielding case, 42 is a chassis, and 45 is a lens system.

Claims (1)

[Scope of utility model registration request] An image pickup tube body with a front bobbin fixed integrally thereto is housed in a magnetically shielded case, and a flange portion of the front bobbin is clamped and fixed between an annular body disposed on the back side of the flange portion and the flange portion of the magnetically shielded case. An image pickup tube in which the above image pickup tube body is held.