JP3031946B2 - Color picture tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a shadow mask type color picture tube,
In particular, the present invention relates to a color picture tube having improved means for supporting the shadow mask.

(Prior Art) In general, as shown in FIG. 5, a shadow mask type color picture tube comprises a substantially rectangular panel (1) and a funnel-shaped funnel (2) integrally joined to the panel (1). And a shadow mask (4) mounted inside the panel (1), facing and approaching a phosphor screen (3) comprising a three-color phosphor layer formed on the inner surface of the panel (1). I have. The shadow mask (4) is composed of a mask body (5) in which a number of electron beam passage holes are formed, and a mask frame (6) for supporting a peripheral portion thereof. Also,
An electron gun (8) is disposed in the neck (7) of the funnel (2). Then, the three electron beams (9) emitted from the electron gun (8) are horizontally and vertically deflected by the magnetic field of the deflection yoke (10) mounted outside the funnel (2), and the shadow mask (4) The phosphor screen (3) is formed in such a structure that a color image is displayed by scanning the phosphor screen (3) horizontally and vertically through the interface.

In such a color picture tube, in order to display a correct color image on the phosphor screen (3),
The shadow mask (4) must be placed in alignment with the three color phosphor layer of the phosphor screen (3). On the other hand, the shadow mask (4) is attached and detached a plurality of times in the process of forming the phosphor screen (3). Therefore, the shadow mask (4) needs a mask supporting means that can be attached and detached and that can always be correctly attached to the same position for attachment and detachment.

Conventionally, as shown in FIG. 6, a stud pin (12) fixed to each inner wall of the panel (1) and a locking portion ( 13), a strip-shaped elastic frame comprising a fixing portion (14) fixed to the mask frame (6) and a connecting portion (15) connecting the locking portion (13) and the fixing portion (14). There is one configured with a holder (16).

Instead of the strip-shaped frame holder (16), the color shift caused by thermal expansion of the shadow mask (4) due to the collision of the electron beam (9) at the beginning of the operation of the color picture tube is compensated. As shown in FIGS. 7 and 8, stud pins (12) are fixed to the inner walls of the diagonal portion of the panel (1), and the elastic frame holder (16) is engaged with the stud pins (12). A wedge-shaped structure including a locking portion (13) for fixing, a fixing portion (14) fixed to the mask frame (6), and a connecting portion (15) connecting the locking portion (13) and the fixing portion (14). And the connecting portion (15) is fixed to the mask frame (6) with the phosphor screen (3) side (mask body (5) side).

Incidentally, the color picture tube is attached and detached a plurality of times in the step of forming the phosphor screen (3) as described above.
In attaching and detaching the shadow mask (4), a wedge-shaped frame holder (16) is applied with a force F in the direction of the arrow (18) to the locking portion (13) as shown in FIG. Bend. Therefore, this wedge-shaped frame holder (16)
Then, the bending stress concentrates on the boundary part (17) between the locking part (13) and the connecting part (15), and the locking part (13) and the connecting part (15)
And the connecting portion (15) is bent sufficiently before the connecting portion (15) is bent as shown by the dashed line.
The tip of (3) comes into contact with the mask frame (6) or the fixing portion (14) of the frame holder (16), so that the frame holder (16) cannot be bent any further. Therefore, the boundary (17) collides with the stud pin (12),
The stud pin (12) may be damaged or, in extreme cases, the collision may make it impossible to remove the shadow mask (4). In particular, such a problem arises from the characteristics of the frame holder (16) and the convenience of its arrangement, as shown in FIG. In the case of the frame holder (16) which is narrower than the width w2 on the 14) side (w1 <w2), the spring constant on the locking portion (13) side is significantly smaller than the spring constant on the fixed portion (14) side. Easy to get rid of.

(Problems to be Solved by the Invention) As described above, as a mask supporting means for detachably supporting a shadow mask on the inside of a panel, there is a conventional one using a band-shaped frame holder and a wedge-shaped frame holder. Each of the frame holders includes a locking portion that locks to the stud pin, a fixing portion that is fixed to the mask frame, and a connecting portion that connects the locking portion and the fixing portion. When the locking part is bent by applying force to attach or detach the shadow mask, the tip of the locking part contacts the fixing part of the mask frame or frame holder, and the frame holder can not be bent further. In some cases, the boundary portion between the engaging portion and the connecting portion collides with the stud pin to cause damage. In an extreme case, the collision may make it impossible to attach or detach the shadow mask. In particular, such a problem is caused by the characteristics of the frame holder and the convenience of its arrangement, in the case of a frame holder in which the width of the connecting portion on the locking portion side is narrower than the width of the fixing portion side. Since the spring constant is significantly smaller than the spring constant on the fixed portion side, there is a problem that the spring constant easily occurs.

The present invention has been made in order to solve the above problems, and even if a force is applied to the locking portion of the frame holder to attach and detach the shadow mask, the boundary portion between the locking portion and the connecting portion may be used. An object is to provide a structure that does not generate large bending.

[Constitution of the Invention] (Problems to be Solved by the Invention) A mask supporting means for supporting a shadow mask including a mask body having a large number of electron beam passage holes formed therein and a mask frame for supporting a peripheral portion of the mask body is provided. A plurality of stud pins fixed to the panel, a plurality of locking portions for locking to the stud pins, a plurality of fixing portions fixed to the mask frame, and a plurality of connecting portions for connecting the locking portions and the fixing portions. A color picture tube comprising: a frame holder;
In addition, a reinforcing portion is provided at the boundary between the locking portion and the connecting portion so that the spring constant at the boundary portion is higher than the spring constant at the fixed portion side of the connecting portion, and this reinforcing portion is masked more than the locking portion. It was arranged on the frame side.

(Operation) As described above, a reinforcing portion is provided at the boundary between the locking portion and the connecting portion so that the spring constant at the boundary is higher than the spring constant on the fixed portion side of the connecting portion. If it is arranged closer to the mask frame than the stopper, even if a force is applied to the locking part to attach and detach the shadow mask, this bending stress can be concentrated on the fixed part side of the connecting part, thereby Can be bent sufficiently, and the shadow mask can be easily attached and detached so that the boundary between the locking portion and the connecting portion does not collide with the stud pin.

Hereinafter, the present invention will be described based on embodiments with reference to the drawings.

FIG. 1 shows a color picture tube as one embodiment of the present invention. This color picture tube has an envelope consisting of a substantially rectangular panel (1) and a funnel-like funnel (2) integrally joined to the panel (1), and is formed on the inner surface of the panel (1). And a mask body (5) having a large number of electron beam passage holes formed therein, facing and approaching the phosphor screen (3) comprising a three-color phosphor layer emitting blue, green and red light. A shadow mask (4) comprising a mask frame (6) for supporting the peripheral portion is mounted by the following mask supporting means. Further, an electron gun (8) is provided in the neck (7) of the funnel (2). Then, the three electron beams (9) emitted from the electron gun (8) are deflected in the horizontal and vertical directions by the magnetic field of a deflection yoke (10) mounted outside the funnel (2). ) Through the phosphor screen (3) horizontally,
It is formed in a structure that displays a color image by performing vertical scanning. In addition, (20) is an inner shield attached to the mask frame (6) to shield an external magnetic field.

As shown in FIGS. 2 and 3, the mask supporting means includes a plurality of stud pins (21) fixed to the inner wall of the diagonal portion of the panel (1) and an outer portion of the mask frame (6). A plurality of elastic frame holders (22) fixed to the side surface and detachably engaged with the stud pins (21). Each frame holder (22) is, for example,
A locking portion (24) having a locking hole (23) for locking the stud pin (21) by bending a stainless steel material of about 4 mm, and a fixing portion (2) fixed to the mask frame (6).
5) and a mask which is integrally formed in a wedge shape comprising a connecting portion (26) connecting the locking portion (24) and the fixed portion (25), with the connecting portion (26) facing the phosphor screen (3). Attached to the frame (6).

Further, in the color picture tube of this example, the boundary between at least one locking portion (24) and the connecting portion (26) of the frame holder (22) is provided inside, that is, the locking portion (24). A reinforcing member (28) is attached by welding so as to be closer to the mask frame (6) side and to make the spring constant at the boundary thereof higher than the spring constant at the fixed part (25) side of the connecting part (26). . The reinforcing member (28) may be attached by welding to both the locking portion (24) and the connecting portion (26), or may be welded to only one of them.

By the way, as described above, the spring constant of the boundary portion (26) is set at the boundary between the locking portion (24) and the connecting portion (26) of the frame holder (22), and the fixing portion (25 When a reinforcing member (28) having a higher spring constant is attached to the panel (1), as shown in FIG. ), A bending force that reduces the angle θ at the boundary between the locking portion (24) and the connecting portion (26) is suppressed, and bending stress is reduced. The frame holder (22) can be bent mainly on the fixing portion (25) side of the connecting portion (26). Moreover, since the reinforcing member (28) is attached to the mask frame (6) side rather than the locking portion (24), the panel (1)
When the frame holder (22) is bent in order to attach and detach the shadow mask (4) to the mask frame (6) or the frame holder (6) or the frame holder as shown by the dashed line in FIG. The boundary between the locking part (24) and the connecting part (26) can be bent away from the stud pin (21) without contacting the fixing part (25) of (22). Damage to the stud pin due to the generated collision between the stud pin and the boundary between the engaging portion and the connecting portion, and the inability to attach / detach the shadow mask due to the collision can be effectively eliminated.

In the above-described embodiment, the reinforcing member is attached to the entire surface in the width direction at the boundary between the locking portion and the connecting portion. However, as shown in FIG. It may be simply attached to the inner surfaces on both sides of the boundary between the part (24) and the connecting part (26) in close contact, and as shown in FIG.
A bridge may be attached to both sides of the boundary between the 4) and the connecting portion (26). In addition, such reinforcement at the boundary between the locking portion and the connecting portion is performed by the frame holder (22).
Can be integrally formed by bending.

Further, in the above embodiment, the case where the width of the locking portion is narrower than the width of the fixing portion has been described.

Although the wedge-shaped frame holder has been described in the above embodiment, the present invention is also applicable to a strip-shaped frame holder.

[Effect of the Invention] A reinforcing portion for increasing the spring constant at the boundary portion between the locking portion of the elastic frame holder that supports the shadow mask and the connecting portion is higher than the spring constant at the fixed portion side of the connecting portion. If the reinforcing portion is provided closer to the mask frame than the locking portion, even if a force is applied to the locking portion to attach or detach the shadow mask, bending at the boundary between the locking portion and the connecting portion is performed. And the bending stress can be concentrated on the fixed portion side of the connecting portion, and the frame holder can be bent mainly on the fixed portion side of the connecting portion. Therefore, even if the frame holder is bent to attach and detach the shadow mask to and from the panel, the fixed portion side of the connection portion can be sufficiently bent, and the boundary portion between the locking portion and the connection portion does not collide with the stud pin. Thus, the shadow mask can be easily attached and detached.

[Brief description of the drawings]

1 to 4 are explanatory views of an embodiment of the present invention. FIG. 1 is a view showing a structure of a color picture tube as one embodiment of the present invention, and FIG. 2 is a view showing a structure of a mask supporting means thereof. , Third
4 is a perspective view showing the structure of a wedge-shaped frame holder constituting the mask supporting means, FIGS. 4 (a) and 4 (b) are perspective views showing different frame holder structures, and FIG. 5 is a conventional color picture tube. FIG. 6 is a rear view showing a shadow mask supporting structure using a strip-shaped frame holder, FIG. 7 is a rear view showing a shadow mask supporting structure using a wedge-shaped frame holder, and FIG. FIG. 9 is a perspective view showing the structure of the wedge-shaped frame holder. DESCRIPTION OF SYMBOLS 1 ... Panel, 3 ... Phosphor screen 4 ... Shadow mask, 5 ... Mask body 6 ... Mask frame, 8 ... Electron gun 21 ... Stud pin, 22 ... Frame holder 23 ... Locking hole , 24 ... locking part 25 ... fixed part, 26 ... connecting part 28 ... reinforcing member

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-55-154038 (JP, A) JP-A-63-10436 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 29/02

Claims (1)

(57) [Claims] 1. A shadow mask comprising a mask body having a large number of electron beam passage holes formed in opposition to a phosphor screen formed on an inner surface of a panel and a mask frame supporting a peripheral portion of the mask body. A plurality of stud pins fixed to the panel, a plurality of stud pins fixed to the panel, a locking portion fixed to the stud pins, a fixed portion fixed to the mask frame, and the locking A color picture tube comprising a frame holder comprising a connecting portion connecting the portion and the fixing portion, wherein at least one of the frame holders is provided at a boundary between the locking portion and the connecting portion at a spring on the fixing portion side of the connecting portion. A reinforcing portion for increasing the spring constant of the boundary portion than the constant is provided, and the reinforcing portion is closer to the mask frame than the locking portion. A color picture tube characterized by being arranged.