JPH0125410Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image pickup tube device, such as a Vitacon tube, in which an alignment magnet is attached to the outer periphery of the aperture of an image pickup tube.

Generally, in image pickup tube devices used in television cameras, etc., due to variations in the image pickup tube or coil assembly, the electron beam no longer scans parallel to the optical axis, resulting in deterioration in image quality.
In order to compensate for image quality deterioration, it is known that a pair of bipolarly magnetized alignment magnets is rotatably provided around the aperture of the image pickup tube. In this case, the pair of alignment magnets are arranged in close proximity to each other so that rotational adjustment is achieved without co-rotation and zero magnetic field is obtained when adjustment is not required. , which is desirable from the viewpoint of always obtaining good image quality characteristics.

In the conventional image pickup tube apparatus, as shown in FIG. To prevent co-rotation between the joint surfaces,
In order to apply appropriate rotational torque to both magnets 3 and 4, a spacer 5 made of a ring-shaped plate or wire having spring properties is provided in the axial direction. However, in such a configuration, the alignment magnet 3,
By installing the spacer 5 between the two magnets 3 and 4, a gap S is created between the two magnets 3 and 4, making it impossible to obtain the zero magnetic field required when adjustment by the alignment magnets 3 and 4 is not required. In addition to it being difficult to always obtain good image quality characteristics, the spring force of the spacer 5 deteriorates over time, making it difficult to maintain accurate rotational adjustment of the magnets 3 and 4. This method has various disadvantages, such as an increase in the number of parts, which causes an increase in costs, and an increase in the number of assembly steps, which deteriorates work efficiency.

The present invention relates to an image pickup tube device aimed at eliminating the above-mentioned drawbacks, and in particular, a pair of alignment magnets attached to the outer periphery of the aperture of the image pickup tube. The present invention relates to an image pickup tube device which is independently attached and fixed to fitting pieces having spring properties in the directions.

An embodiment of the present invention will be described in detail below with reference to the drawings. In FIG. 2, reference numeral 11 denotes an imaging tube such as a videocon tube, which has a target ring 12 at its front end. It is stored and fixed in the locked state. A deflection coil 15 is wound around the outer periphery of the coil bobbin 13, and
A pair of bipolarly magnetized ring-shaped alignment magnets 17 and 18 are rotatably attached to the outer periphery of the aperture 11A of the image pickup tube 11 via a fixed part 16 formed on the outer periphery of the coil bobbin 13. . A pair of alignment magnets 17,1
The fixed part 16 to which the coil bobbin 8 is attached is the coil bobbin 13
It is provided in a cylindrical shape along the tube axis direction from the rear surface of the collar 13B formed in the coil bobbin 13.
A gap K is formed between the outer periphery on the rear end 13C side and the inner surface of the fixing part 16. Further, the fixed part 16 includes a third
As shown in FIGS. 4A and 4B, two pairs of fitting pieces 19 and 20 having spring properties in the radial direction are provided diagonally in correspondence with each of the alignment magnets 17 and 18 (four pieces in total). The fitting pieces 19 and 20 both have spring properties due to the slits 21, and the fitting piece 19 on the front side (target ring 12 side) has an alignment magnet 17, and the fitting piece 17 on the rear side Alignment magnets 18 are independently attached and fixed to each piece 20.
Of the fitting pieces 19 and 20, the fitting piece 19 has a mounting surface 19A that comes into contact with the inner peripheral surface of the alignment magnet 17, and the fitting piece 20 has a mounting surface 19A that comes into contact with the inner peripheral surface of the alignment magnet 18. A hook-shaped protrusion 20 for preventing the placement surface 20A and the alignment magnets 17 and 18 from coming off from the fixing part 16
B, alignment magnet 1
7 and 18 are the mounting surfaces 1 of each of the fitting pieces 19 and 20 when the fitting pieces 20 are pressed radially inward and the tips of the hook-shaped projections 20B are flush with the outer periphery of the fixing part 16.
It is mounted and fixed on 9A and 20A. Here, mounting surfaces 19A, 20A of fitting pieces 19, 20
Usually, alignment magnets 17, 18
When the alignment magnets 17 and 18 are installed, the mounting surfaces 19A and 20A are pressed radially inward by the spring force, and each alignment magnet It provides independent rotational torque to the magnets 17 and 18, respectively. On the other hand, on the fitting piece 19 side of the fixing portion 16, protrusions 22 are provided diagonally to restrict the positions of the alignment magnets 17 and 18. in this case,
Rear surface of protrusion 22 (alignment magnet 17
) and the hook-shaped projection 20B of the fitting piece 20
The distance R from the front surface of the magnet is approximately equal to the thickness of the pair of alignment magnets 17 and 18 (the
7 and 18), and the alignment magnets 17 and 18 are
The position is regulated by the protruding piece 22 and the hook-shaped protrusion 20B,
And each mounting surface 19A, 20 of fitting pieces 19, 20
A rotational torque is applied by the radially outward spring force of A, and it is mounted and fixed on the fixing part 16. In FIG. 2, 23 is a cylindrical magnetic shield made of a magnetic material such as permalloy.

In the image pickup tube device having such a configuration, the alignment magnets 17 and 18 are independently mounted and fixed on mounting surfaces 19A and 20A formed on the fitting pieces 19 and 20 of the fixed part 16, respectively, and rotated as necessary. Make adjustments. At this time, each alignment magnet 17, 18 is given an independent rotational torque by each fitting piece 19, 20, and each alignment magnet 17, 18 is
Rotation adjustment is performed independently without rotating in close contact with each other.

In addition, in one embodiment of the image pickup tube device of the present invention,
In the above description, two sets (four sets in total) of fitting pieces 19 and 20 having spring properties are provided diagonally on the fixed part 16, corresponding to each of the alignment magnets 17 and 18. , 18, the number of fitting pieces 19, 20 is not limited to the embodiment and can be increased or decreased as appropriate. Further, in one embodiment of the present invention, the fitting piece 20 has a mounting surface 20A and a hook-shaped projection 20.
In the above description, only the mounting surface 20A is provided for the fitting piece 20, and the hook-shaped projection 20B is provided.
may be provided separately, and the installation position, shape, etc. of the hook-shaped protrusion 20B are not limited to the embodiment, as long as it can prevent the alignment magnets 17 and 18 from coming off the fixed part 16. It's not a thing. Furthermore, in one embodiment of the present invention, a case has been described in which the protruding piece 22 is provided at a different position from the fitting piece 19, but the protruding piece 22 may be provided on the fitting piece 19, or the protruding piece 22 The alignment magnet 1 may be continuous in the circumferential direction to form a flange shape.
The structure of the protrusion 22 is not limited to the embodiment as long as the positions of the protrusions 7 and 18 can be restricted. In one embodiment of the present invention, it has been described that the fixing part 16 for mounting and fixing the alignment magnets 17 and 18 is provided on the outer periphery of the rear end 13C of the coil bobbin 13. The fixing part 16 is raised from the outer surface of the
The shape of the fixing part 16 is not limited to a cylindrical shape, but may also be a tongue-like shape with a plurality of grooves in the tube axis direction. The present invention is not limited to the embodiments as long as the magnets 17 and 18 can be attached and fixed.

As described above, according to the image pickup tube device of the present invention, fitting pieces having spring properties in the radial direction are provided in the fixed portion provided on the outer periphery of the aperture in correspondence with each of the alignment magnets. Each alignment magnet is independently attached and fixed to each fitting piece, and each alignment magnet is given an independent rotational torque by the spring force in the radial direction of the fitting piece. There is no risk of co-rotation, and the alignment magnets each perform their own rotation adjustment. In addition, it does not require a spacer between the alignment magnet, which reduces the number of parts and reduces costs.
It also improves work efficiency and is suitable for mass production. Furthermore, since there is no gap between the alignment magnets, it is easy to obtain the zero magnetic field required when no magnetic field adjustment is required, and a predetermined magnetic field distribution can be obtained, resulting in consistently good image quality characteristics. It has various effects such as being able to provide the following, and is extremely effective in practice.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional side view of the main parts of a conventional image pickup tube device.
FIG. 2 is a cross-sectional side view of an image pickup tube device according to an embodiment of the present invention, FIG. 3 is a perspective view of the fixing portion, and FIG. 4 is a rear view of the fixing portion. 11...Image tube, 11A...Aperture, 16
... Fixed part, 17, 18 ... Alignment magnet, 19, 20 ... Fitting piece.

Claims (1)

[Scope of utility model registration request] In an image pickup tube device comprising a pair of alignment magnets rotatably mounted via a fixing part provided on the outer periphery of an aperture of an image pickup tube, a pair of alignment magnets is attached to the fixing part in a radial direction corresponding to at least each of the alignment magnets. An image pickup tube device characterized in that a fitting piece having spring properties is provided, and the alignment magnets are each independently attached and fixed to the fitting piece.