JPH0724196B2 - Color cathode ray tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention is directed to a color selection means for landing an electron beam on a fluorescent pattern of a predetermined color on a color fluorescent surface so as to face the color fluorescent surface. The present invention relates to a color cathode ray tube.

[Outline of Invention]

The present invention adopts a structure in which the frame of the color selecting means is attached to the panel portion of the color cathode ray tube body by the engagement of the spring and the stud pin, and the displacement of the frame is provided by providing the stopper for restricting the deformation amount of the spring. The position is restricted so that when a large impact is applied from the outside, the frame is prevented from being largely displaced against the elasticity of the spring and abutting against the panel portion.

[Conventional technology]

In a color cathode ray tube, as shown in FIG. 9, a large number of slit-shaped electrons extending vertically, for example, are provided in a panel portion (1) of a cathode ray tube body having a color fluorescent surface formed on the inner surface thereof. A color selection means (2) such as an aperture grill having beam transmission openings arranged therein is arranged. As shown in FIG. 10, the color selection means (2) is, for example, a color selection electrode (3) made of a thin metal plate in which slit-shaped electron beam transmission openings (3a) extending in the vertical direction are arranged. Are mounted on the frame (4). Frame (4)
The frame sides (4A) and (4B) of the pair facing each other and these frame sides (4
It consists of a pair of arms (4C) and (4D) arranged across A) and (4B), and the color selection electrode (3) is in the slit shape between the frame sides (4A) and (4B). It is attached at each end of the opening (3a) and stretched with a required tension.

The color selection means (2) is attached to the panel section (1) by
Usually, since the color selecting means (2) is used as an optical mask to optically form the fluorescent substance patterns of the respective colors, it is necessary to be detachably attached and reproduced and attached at a predetermined position. It is necessary to be able to return to a predetermined position even if an external impact such as accidentally dropping or colliding with another is given after it is completed as a cathode ray tube. Therefore, the engagement between a support pin, which is usually a so-called stud pin (5) attached to the peripheral side wall (1s) of the panel portion (1), and a spring (6) formed of a leaf spring provided on the frame (4) It is done by combination. For example, the opposite arm portions (4C) and (4D) of the frame (4) and the frame side (4
B) and one end of each spring (6) are welded to each other, and the support pin fritted to the inner surface of the panel part (1) in the through hole (7) formed in the free end of each spring (6). By fitting (5), it is detachably held at a predetermined position.

The support pin (5) has a frustoconical shape made of, for example, ceramic, and the through hole (7) of the spring (6) has a peripheral surface of the support pin (5) as shown in FIGS. 11 and 12. The support pin (5) and the inner peripheral edge of the through hole (7) are selected to have an inner shape having three sides (7A) (7B) (7C) circumscribing to each side (7A).
The points P _A , P _B , and P _C in (7B) and (7C) are in point contact with each other so that the engagement position of the support pin (5) and the spring (6) is set. Has been done.

As described above, when the color selecting means (2) is supported at each point on the three sides of the frame (4), the color selecting means:
Since it is substantially prevented from moving with respect to the panel portion (1),
Even if a large impact is given from the outside such as dropping the cathode ray tube, there is no possibility that the color selecting means (2) is displaced so much as to hit the peripheral side wall of the panel section (1).

However, in a color cathode ray tube equipped with this kind of color selecting means, the color selecting means are arranged so that the color selecting means are opposed to each other in the frame.
When the structure is to be attached to the panel part via the spring at the side, the frame is, for example, 2 facing each other.
Since it is elastically movable in the direction orthogonal to the side (hereinafter this direction is referred to as the Y direction), when a large impact is applied from the outside, the color selection means (2) causes the panel section (1) to move. May cause a large displacement in the Y direction,
As a result, the color selection means (2) may hit the peripheral side wall surface of the panel portion (1), for example, causing damage to the panel portion (1) and causing an implosion accident.

[Problems to be solved by the invention]

The present invention is intended to solve the above-mentioned problem that the color selection means hits the panel portion.

[Means for solving problems]

The present invention is directed to a color cathode ray tube, and particularly to a case where the color selecting means is supported by the panel portion on the two opposite sides of the frame by the engagement of the spring and the support pin. As will be described later, this structure is for the purpose of preventing mislanding due to the temperature rise of the color selecting means during the operation of the color cathode ray tube, for example.

The present invention, as shown in FIGS. 1 to 4, includes a peripheral side wall (1s) of a panel portion (1) of a color cathode ray tube and a frame (4) of color selecting means (2) attached to the peripheral side wall (1s). One of the spring (16) and the support pin (15) that engage with each other is provided at the two symmetrical sides corresponding to each other, for example, at the left and right symmetrical positions on the upper and lower sides. The frame (4) provided with the spring (16) or the peripheral side wall (1s) of the panel portion (1), in the illustrated example, the upper and lower frame sides (4A) and (4B) on the frame (4) side, When each spring (16) elastically deforms by a predetermined amount in the axial direction of the supporting pin (15) to be engaged, it abuts against this spring (16) to restrict the deformation. 2
6) is provided to limit the maximum displacement position of the frame (4) within the panel portion (1).

In FIGS. 1 to 4, parts corresponding to those in FIGS. 9 to 12 are denoted by the same reference numerals and duplicate description will be omitted. Here, the spring (16) is, for example, associated with each support. In the vicinity of the pin (15) and in the vicinity of the attachment portion of the spring (16) to each side of the frame (4), the first rotation is possible about the axis of the corresponding support pin (15).
And second rotation mechanism parts (51) and (52).

[Action]

According to the configuration of the present invention, the stopper (26) restricts the deformation of the spring (16) so that the frame (4)
Since the amount of displacement within the panel portion (1) of the frame is limited, the frame (4) is elastically held in a fixed position by the overall action of all springs (16), so that a large impact is given from the outside. In this case, even if the spring (16) is largely deformed and the frame (4) is largely displaced, the stopper (26) restricts the deformation of the spring (16). Since it is also limited, it is possible to prevent the disadvantage that the frame (4) collides with the panel portion (1).

Then, as described above, when the first and second rotation mechanism parts (51) and (52) are provided for each spring (16), mislanding due to temperature rise during operation can be prevented.

To explain this, in the color cathode ray tube equipped with the color selection means (2), the electron beam passage is restricted by the color selection electrode (3) during operation and the electron beam transmission aperture (3a) cannot pass through. The electrons collide with the electrode (3) itself, the temperature of the color selection means (2) rises to a considerably high temperature, and the color selection electrode (3) thermally expands, whereby the electron beam is landed on the fluorescent surface. Crazy occurs. This will be further explained with reference to FIG. 13. Now, one electron beam (8) for one color, for example, red, is transmitted through the electron beam transmission aperture (for example, slit-shaped electron beam (8) of the color selection electrode (3). 3a) landing on the corresponding red fluorescent pattern (9R) of the color fluorescent surface (9) formed on the front surface (1f) of the panel section (1). Let's look at the case. In this case, assuming that the electron beam (8) is just landed on the phosphor pattern (9R) through the electron beam transmitting opening (3a) of the color selection electrode (3) at room temperature, as described above. As shown in FIG. 13, the electron beam transmission aperture (3a) is moved horizontally by the arrows (11a) and (11b) as shown by the chain line in FIG. 13 due to the temperature rise and thermal expansion of the color selection means during the operation of the cathode ray tube. When moved to, the landing position of the electron beam on the fluorescent surface (9) will land on the fluorescent material pattern of another color deviated from the original pattern (9R), as shown by the chain line arrow. Color shift occurs. This phenomenon becomes remarkable especially in the peripheral portion of the screen where the movement amount of thermal expansion is large. To avoid such inconvenience, the electrode (3) distance between the fluorescent face (9) in response to the thermal expansion of the electrode (3) as shown by a broken line shown in the figure, Bahaito h ₁ so Bahaito is early Therefore, if the bar height h ₂ is moved to a required small amount according to the thermal expansion, that is, the temperature rise, the landing position on the fluorescent surface (9) can be prevented from moving.

As described above, as a method of changing the distance from the fluorescent surface, that is, the bar height with the temperature rise, the spring (6) supporting the frame (4) of the color selection electrode (3) is made into a bimetal structure, and There is a method of sensing the temperature and adjusting the distance from the fluorescent surface. However, in this case, since the change in the surrounding temperature and the change in the temperature of the electrode (3) are not separately detected, even when the surrounding temperature changes, that is, the fluorescent surface (9) of the electrode (3). Even if there is no change in the relative position with respect to, the gap with the fluorescent surface may be indiscriminately changed, and rather a color shift may occur.

However, in the above-described configuration of the present invention, the above-described first and second rotation mechanism portions (51) and (52) are respectively provided on the two opposite frame sides (4A) and (4B) of the frame (4). Such a mislanding can be prevented when the four-point support structure in which each pair of springs (16) is provided is provided. The operation of this will be described with reference to FIG. In this case, only the part relating to one of the opposite sides of the frame (4) is shown. In this state, if the frame (4) is extended from the state shown by the solid line to the left and right in the figure due to the temperature rise as shown by the chain line, the pair of springs (16) to the frame (4) in the figure is accordingly moved. The mounting portions S ₁ and S ₂ spread to the left and right. At this time, the first and second rotating mechanism parts (51) and (52) move so as to spread to the left and right while being rotated. At this time, with respect to each spring (16), the first and second If the strokes of the rotating mechanism parts (51) and (52), and between the second rotating mechanism part (52) and the mounting parts S ₁ and S ₂ are kept substantially constant, (4) will move toward the front surface (1f) of the panel section (1). That is, the respective mounting portions S ₁ and S ₂ are moved to the positions shown by symbols S ₁ ′ and S ₂ ′ in the figure, respectively, and the frame (4) is moved from the bar height h ₁ at the initial position shown by the solid line to a position smaller than that. Will move to the position of bar height h ₂ . In other words, the first and second rotation mechanism parts (51)
The rotation centers of (52) and (52) are rotated about a direction orthogonal to the bar height adjustment direction to be adjusted. If the moving amount of the bar bite is set so that the required amount can be obtained by selecting the stroke length of the spring (16) and the arrangement positions of the support pin (15) and the spring (16), As explained in Fig. 13, the bar height can be adjusted to prevent mislanding.

〔Example〕

Further, the present invention will be described in detail with reference to examples. The illustrated example is applied to a color cathode ray tube having an aperture grill type color selecting means (2), and one example of the present invention will be described in detail with reference to FIGS. 1 to 4. Also in this case, in the panel portion (1) of the cathode ray tube body having the color fluorescent surface (9) formed by alternately arranging the fluorescent materials of each color in stripes extending in the vertical direction on the inner surface. ,
An aperture grille, i.e. a color selection means (2) is arranged. In this color selection means (2), the color selection electrode (3) made of a thin metal plate in which slit-shaped electron beam transmission openings (3a) extending in the vertical direction are arrayed is formed in the frame (4). ) Consisting of, for example, an aperture grill mounted above. The frame (4) is a pair of frame sides (4A) and (4B) facing each other and extending in the horizontal direction of the screen, and a pair of arm portions (4A) and (4B) arranged across the frame sides (4A) and (4B). 4C) and (4D), and the color selection electrode (3) is stretched between the frame sides (4A) and (4B).

One end of a spring (16) made of, for example, a strip-shaped leaf spring is provided on each of the left and right sides of the upper and lower frame sides (4A) and (4B) which form two opposite horizontal sides of the frame (4), and each free end is Weld to extend rearward along the pipe axis. At each free end of each spring (16), a support pin (1) is fritted to the inner surface of the panel portion (1).
By engaging with 5) the frame (4) and hence the color selection means (2) is detachably held in place.

The support pin (15) has a cylindrical shape made of ceramic or metal. The free end of the spring (16) is provided with a cap portion (21) that caps the support pin (15). The cap portion (21) can be formed integrally with the spring (16) by squeezing, but as shown in FIG. 6, the flange portion (21b) formed separately from the spring (16). A metal cap pressed with, for example, stainless steel 304 having
Through hole (24) at the free end of the spring (16)
Alternatively, the flange portion (21b) can be welded to the spring (16).

On the central axis of the top surface (15a) of the support pin (15), for example, a projection (22) is provided integrally with the support pin (15) at the same time when the support pin (15) is molded.

On the other hand, on the central axis of the bottom surface (21a) of the cap portion (21), a recess (23) into which the projection (22) is dropped is provided. The concave portion (23) can be formed on the bottom surface (21a) of the cap portion (21) itself by pressing or the like. However, as in the example shown in FIG. It is also possible to press-fit a disc made of a material having a small frictional resistance with respect to 22) such as ceramic to form a recess (23) at the center of the disc. The support pin (15) is arranged such that the apexes of the projection (22) and the recess (23) are located on the respective axial centers of the cap portion (21) so as to be stably engaged with the respective axial centers thereof. . The projections (22) and the recesses (23) may have various shapes.

For example, as shown in FIG. 6, the projection (22) is spherical and the recess (23) is conical. Then, in this engaged state, a gap is created between the top surface (15a) of the support pin (15) and the bottom surface (21a) of the cap portion (21), and the peripheral surface of the support pin (15) and the cap portion (15). A gap g exists between the inner peripheral surfaces of (21).

Further, the projection (22) is not limited to a spherical shape, and may have various shapes such as a parabolic shape, and the recess (23) may be, for example, the eighth shape.
As shown in FIG. A, it may be a spherical surface or a conical surface that spreads gently, or, as shown in FIG. 8B, a protrusion (22).
It is possible to adopt various shapes such as a curved surface corresponding to the curved surface of.

On the other hand, the first rotation mechanism part (51) of the spring (16) is configured to be swingable on the axial center of the pin (15), for example, in the engaging part with the support pin (15). obtain. Further, the second rotation mechanism section (52) includes a spring (1
6) A bend or a bent portion is provided on itself so that it can rotate here, or, as shown in FIGS. 7A and 7B, a spring (16) likewise is a holder (56 ) Of the holder (56) and the other end (56b) of the holder (56) is attached to the frame (4) by welding or the like.
Alternatively, as shown in FIG. 7C, the spring (16) may be provided with corrugations to form the second rotation mechanism section (52), and various other configurations may be adopted.

A stopper (26) made of a relatively rigid metal plate is provided on the rear side of each frame side (4A) and (4B) of the frame (4).
Is attached by welding on one half side thereof, and the free end side is bent up from the rear surfaces of the frame sides (4A) and (4B). The metal plate of the stopper (26) has its one side edge protruding by a required height H from the upper surface of the upper frame side (4A) and the lower surface of the lower frame side (4B), respectively. The side edges of the formed free ends are arranged at the free ends of the corresponding springs (16) at predetermined intervals D on the surfaces corresponding to the frame sides (4A) and (4B) to which the springs (16) are attached. To face each other. The space D is set such that when the spring (16) is bent and deformed in the Y direction along with the axial direction of the pin (15) on the free end side that engages with the support pin (15).
The distance is set so as to contact with the panel portion (1) with a predetermined deformation amount that does not hit the panel portion (1).

And, in practice, this stopper (26) can be attached to a predetermined position of the frame (4) in advance,
In this case, as described at the beginning, at the time of work such as optical baking of the fluorescent body that forms the color fluorescent surface on the inner surface of the front surface (1f) of the panel portion (1), each frame side (4A) and ( 4B) is placed along the back of the frame (4) so that the deformation of the spring (16) is not restricted, and the panel part (1) of the frame (4) is deformed by deforming the spring (16). The spring (16) and the support pin (15) can be easily attached to and detached from the. After the color fluorescent surface is formed, the free end of the stopper (26) is bent in the final mounting state to the panel portion (1) of the frame (4) to restrict the deformation of the spring (16) described above. To be able to do.

The metal plate that constitutes the stopper (26) is provided with notches (27) on both side edges of the bent portion, if necessary, for facilitating the folding.

In the above example, the spring (16) and the support pin (1) are provided on the upper and lower sides of the frame (4) and the panel portion (1).
Although the bar height adjusting means by engaging with 5) is provided, this means may be provided on each of the left and right sides.

Furthermore, the present invention is not limited to the case of applying to the color cathode ray tube having the aperture-grull type color selecting means (2) as in the above-mentioned example, and is applied to the color cathode ray tube having various color selecting means (2). can do.

〔The invention's effect〕

As described above, according to the present invention, the stopper (26) is provided even in the four-point support structure, so that the deformation of the support pin (15) in the axial direction (Y direction) is restricted in the spring (16). Since the movement of the frame (4) is restricted, it is possible to avoid the inconvenience that the frame (4) impacts and damages the peripheral side wall (1s) of the panel portion when a strong external impact is applied.

Further, according to the present invention described above, since the support of the color selecting means (2) is elastically supported in the direction perpendicular to the tube axis direction by the pair of upper and lower springs (16), the color in both of these directions is colored. The responsivity deteriorates for frequencies higher than the natural frequency determined by the weight of the selection means (2) and the spring constant, for example, frequencies above 100 Hz, so external vibrations are transmitted to the color selection electrode and affect the image. Such inconvenience is avoided.

[Brief description of drawings]

FIG. 1 is a rear view of a mounting portion of a color selecting means of an example of a color cathode ray tube according to the present invention, FIG. 2 is a sectional view taken along the line AA, FIG. 3 is a perspective view of the color selecting means, and FIG. FIG. 7 is a perspective view showing the relationship between a spring and a stopper, FIG. 5 is a view showing the basic configuration of the present invention, FIG. 6 is a sectional view of an engaging portion between the support pin and the spring, and FIGS. FIG. 8 is a perspective view of each example of a spring, FIG. 8 is a cross-sectional view of each example of an engaging portion of a recess and a protrusion in an engaging portion of a spring and a support pin, and FIG. 9 is a mounting portion of a conventional color selecting unit. Rear view of the tenth
FIG. 11 is a perspective view of the color selecting means, FIG. 11 is a plan view of an engaging portion between the support pin and a spring, and FIG. 12 is A- of FIG.
FIG. 13 is a cross-sectional view taken along the line A, and FIG. 13 is an illustration of mislanding. (1) is a panel section, (2) is a color selection means, (3) is a color selection electrode, (15) is a support pin, (16) is a spring, (2)
6) is a stopper, and (51) and (52) are first and second rotation mechanism parts.

Claims (1)

[Claims] 1. A pair of support pins and the respective support pins are respectively engaged with the opposite sides of the frame of the color selecting means and the inner surfaces of the sides corresponding to the opposite sides of the peripheral side wall of the panel portion of the cathode ray tube body. A color cathode ray tube in which a spring is provided and the frame is attached to a panel surface having a color fluorescent surface of the panel portion, wherein the spring is provided in the vicinity of the support pin and to the frame of the spring. First and second rotating mechanism parts formed respectively near the mounting part are configured to change the interval between the color selecting means and the fluorescent screen according to the temperature of the color selecting means. The frame or panel portion to which the spring is attached is provided with a stopper that restricts the amount of deformation of the spring to limit the maximum displacement position of the frame. Color cathode-ray tube to be.