JPS633083Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electromagnetic focusing cathode ray tube in which an electron beam from an electron gun housed in the neck of a bulb is focused by a focus magnet attached to the outer periphery of the neck.

An example of an electromagnetic focusing cathode ray tube is shown in Figure 1.
1 is a valve, 2 is a neck portion of the valve 1, 3 is a funnel portion of the valve 1, 4 is an electron gun housed in the neck portion 2, and 5 is an internal conductive film deposited from the neck portion 2 to the inner surface of the funnel portion 3. It is. The electron gun 4 has a cathode K and a plurality of grid electrodes G arranged coaxially, and a plurality of support springs 6 are fixed to the grid electrode G at the tip.
The tip of the is positioned within the neck 2. 7 is a deflection coil fitted and fixed on the outer periphery of the neck portion 2;
Reference numeral 8 denotes a focus magnet device that is fitted and fixed to the outer periphery of the neck portion 2 from behind the deflection coil 7;
Inside this is a divided focus magnet 9.
is stored. Focus magnet device 8
and attachment of the deflection coil 7 The electron beam is determined by the position of the electron gun 4 in the network part 2, and the electron beam accelerated and emitted from the electron gun 4 is focused by the focus magnet 9, and then focused by the deflection coil 7. It is deflected and radiated forward.

As shown in FIGS. 2 and 3, the focus magnet device 8 includes a case body 8a that houses the focus magnet 9, and a lid body 8b that is closely fixed to the opening end of the case body 8a for housing the focus magnet. The case body 8a has slits 10 at four locations, for example, at 90° intervals in the center of the case body 8a.
A split cylindrical mounting portion 8c having an inner diameter approximately the same as the outer diameter of the neck portion 2 is coaxially protruded. Focus magnet 9 on case body 8a
To attach the focus magnet storage case 8 which houses the magnet and fixes the lid 8b, insert it into the neck part 2, and then attach a steel metal band 1 to the outer periphery of the mounting part 8c.
1 and tightening this metal band 11 with screws 12.

By the way, Focus Magnet Storage Case 8
Adjustment of the mounting position in the axial direction is done by loosening the metal band 11 and moving it in the axial direction on the outer periphery of the neck part 2, so there is no problem. There was a problem. That is, this alignment is performed on the premise that the central axes of the electron gun 4 and the neck part 2 are aligned, and the focus magnet device 8 is aligned with the central axis of the neck part 2. However, electron gun 4
is unstable because it is supported elastically within the neck part 2 via the support spring 6, etc.
The center axis of the electron gun 4 may deviate from the center axis of the electron gun 4. Therefore, even if the focus magnet device 8 is accurately aligned with the neck portion 2, the alignment with the electron gun 4 may be inaccurate. I couldn't do it.

The present invention has been made in view of the above problems, and provides an electromagnetic focusing cathode ray tube in which the mounting structure of the focus magnet device is improved so that alignment with the electron gun can be easily adjusted.

An embodiment in which the present invention is applied to a cathode ray tube of the type shown in FIG. 1 is shown in FIG. 4 and will be described below. In FIG. 4, the same reference numerals as in FIG. 1 indicate the same contents, and the details are omitted. The only difference is the focus magnet device 13 and its mounting structure; 14 is a cylindrical mounting member with a flange; 15 is a cylindrical mounting member with a flange;
1 is a plurality of mounting screws, for example, three mounting screws, and 16 is a coiled spring material fitted to each screw 15.

The focus magnet device 13 is integrated by covering a case body 13a containing a focus magnet 17 with a cover body 13b, and has a flange 13c integrally formed on the inner outer periphery, and the inner diameter of the inner circumferential surface is a neck portion. The outer diameter of the focus magnet device 13 is set to be slightly larger than that of the focus magnet device 13.
is loosely fitted around the outer periphery of the neck portion 2 with a slight gap. The flange 13c has mounting holes 1 in the axial direction into which screws 15 are inserted, for example, at three locations at 120° intervals.
8 is formed. The mounting member 14 is composed of a split cylindrical mounting portion 14a that is fitted onto the outer periphery of the neck portion 2, and a flange portion 14b that integrally projects from the outer periphery of one end of the mounting portion 14a. Flange 13c of device 13
A mounting hole 19 into which the screw 15 is inserted is formed at a position facing the mounting hole 18 of.

The mounting member 14 is inserted into the neck portion 2 after first inserting the focus magnet device 13,
The mounting portion 14a is positioned at a fixed position on the outer periphery of the neck portion 2, and the metal band 20 is fitted onto the outer periphery of the mounting portion 14a, and the metal band 20 is tightened with the screw 21 to be fixed in the fixed position. . On the other hand, the focus magnet device 13 that has been fitted into the neck portion 2 first faces the flange 13c of the mounting member 19 which has been fixed in place by aligning the respective mounting holes 18 and 19 with the flange 14b of the mounting member 19 that has been fixed first. 1
By inserting the screws 15 through the holes 8 and 19 and tightening them with the nuts 22, the screws 15 are screwed to the mounting member 19 at three points to constitute an interval adjustment means. This screw fastening is performed elastically by interposing a spring member 16 inserted into each screw 15 between the flanges 13c and 14b.
In this way, the focus magnet device 13
Since it is loosely fitted into the neck portion 2 so as to be freely movable in the axial direction and to be slightly tiltable, the axial positioning and inclination can be adjusted by adjusting the amount of tightening of each of the three screws 15. This inclination adjustment is performed by operating the electron gun 4 and aligning the central axis of the focus magnet device 13 with the inclination of its central axis.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and various modifications are possible. For example, the mounting member may have a structure in which it is simply screwed together without using a metal band. Further, the distance adjustment means is the flange portion 14.
protrude the guide pin from b, insert the focus magnet device 13, insert a spring material between the guide pin tip and the focus magnet device 13,
Applying a pressing force elastically in the direction of the flange portion 14b,
The focus magnet device 13 may be pressed by the tip of a screw screwed into the flange portion 14b. Further, the spring member 16 can be omitted by rotatably attaching the tip of the screw screwed to the flange portion 14b to the focus magnet device 13.

As explained above, according to the present invention, the axial positioning adjustment of the focus magnet device and the alignment adjustment with respect to the electron gun can be easily performed, improving assembly workability and producing a cathode ray tube with good operating characteristics. Can be provided.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view showing an example of a conventional electromagnetic focusing cathode ray tube, FIGS. 2 and 3 are side and front views of the focus magnet device in FIG. FIG. 5 is a partially sectional side view showing one embodiment of the present invention, and FIG. 5 is a sectional view taken along the line - in FIG. DESCRIPTION OF SYMBOLS 1...Valve, 2...Network part, 13...Focus magnet device, 14...Mounting member, 14
a...Flange portion, 15, 16... Spacing adjustment means.

Claims (1)

[Scope of utility model registration request] An annular focus magnet device is coaxially arranged on a cylindrical mounting member with a flange formed at one end while maintaining a distance from the flange, and the distance can be adjusted freely using screw distance adjustment means at at least three points. An electromagnetic focusing cathode ray tube characterized in that a component is attached to the outer periphery of the valve neck.