JPS5953654B2 - Support member using bimetal - Google Patents

Description

[Detailed description of the invention] The present invention relates to a support member using bimetal.

For example, in a color television picture tube, if the shadow mask thermally expands when exposed to electron beams, color blurring will occur, so the shadow mask is elastically supported by a support piece made of bimetal, and the thermal expansion of the support piece causes shadows to fade. It compensates for the thermal expansion of the mask and prevents color shift problems.

However, supporting the shadow mask in the narrow interior space of the picture tube limits the space available for supporting the shadow mask, so it is desirable to use a support piece made of bimetal that is small but has a large amount of elongation.

The present invention has been made in view of the above circumstances, and is intended to support a supported object that undergoes thermal deformation (thermal displacement), and by adopting a reverse contact bimetal, it can be used in a narrow space and obtain a large amount of displacement. The purpose of the present invention is to provide a support member using bimetal that can be used.

Embodiments of the present invention will be described below with reference to drawings.

FIG. 1 shows a case where the support member of the present invention is used to support a shadow mask in a color television picture tube. (partially shown), 3 is a support member,
One end of this support member 3 is pivotally connected to the valve 1 via a pivot pin 4, and the other end is fixed to the shadow mask 2 via a pin 5.

The support member 3 employs a so-called reverse contact bimetal, and the reverse contact bimetal is made up of two or more sets of bimetals in which two metal pieces with different coefficients of thermal expansion are superposed, and the superposition positions of each metal piece are different (reverse). In this structure, the amount of expansion of each set is added to each other and the total amount of expansion is proportionally doubled, resulting in a large amount of expansion compared to its shape and dimensions.

The reversely connected bimetal adopted for the support member 3 in this example is 2
A pair of bimetallic metals 3a and 3b are consecutively constructed.
A pair of bimetals 3a located on one end side are made of a metal piece 6 with a low thermal expansion coefficient made of an iron-based alloy containing 35 to 50% by weight of nickel, etc., and stainless steel (18% by weight of chromium).
, an iron-based alloy containing 8% by weight of nickel), etc., are polymerized and combined together, and the bimetal 3b located on the other end side is made by polymerizing metal pieces 6 and 7 made of the same material. Polymerization is performed by changing the position (reverse).

Further, each bimetal 3a, 3b is formed with a continuous curved portion in a different direction, and metal pieces 7, 7 having a high coefficient of thermal expansion are located on the outside of the curved portion, and on one end side. An end of the bimetal 3a is attached to the bulb 1 via a pin 4, and a bimetal end 3b on the other end side is attached to the shadow mask 2 via a pin 5.

Therefore, the length of the entire reverse bimetal in the longitudinal direction is reduced by about half compared to a normal bimetal due to the presence of the curved portion.

When this reversely connected bimetal is heated, the metal pieces at the curved portions of each bimetal 3a and 3b expand in the straight direction by the same amount, so that the total amount of the reversely connected bimetal is twice as much as the amount of expansion of each bimetal 3a and 3b. The amount of extension is obtained.

Therefore, the support member 3 employing this reverse contact bimetal has a small shape and size, and can obtain a large amount of elongation.

Therefore, when the shadow mask 2 receives the electron beam and thermally expands, the support member 3 thermally expands and expands greatly in the longitudinal direction, so that the shadow mask 2 supported by the support member 3
Since the shadow mask 2 is also displaced all at once, color misregistration problems can be prevented by compensating for the displacement caused by thermal expansion of the shadow mask 2.

In addition, the bimetals 3a and 3b constituting the support member 3, that is, the reverse bimetal, each have a curved portion and have elasticity not only in the longitudinal direction but also in a direction perpendicular to the longitudinal direction. Even when thermal expansion occurs in two directions, the support member 3 can elastically absorb the thermal expansion of the shadow mask 2.

Since the support member 3, which uses a reverse contact bimetal, is small, it can be easily installed even in the narrow space between the bulb 1 and the shadow mask 2. Furthermore, the amount of expansion is doubled, so it can withstand the large thermal expansion of the shadow mask 2. However, you can still afford compensation.

In addition, the reverse contact bimetal adopted for the support member 3 is the second
As shown in the figure, bimetals 3a and 3b that are individually manufactured are welded together facing each other with metal pieces 6, 6 and 7, 7 overlapped at different positions, and then bent. As shown in FIG. 3, a stepped portion is formed by cutting, for example, a metal piece 7, 7 in an integral ingot state, another metal piece 7, 7 is polymerized and joined to this stepped portion, and then bending is performed. It can also be manufactured using other methods.

Further, the number of bimetals to be combined as a reversely connected bimetal and the overlapping position of the metal pieces of each bimetal can be variously selected as necessary.

Furthermore, this support member can be effectively used to support a shadow mask of a color television picture tube, but it can also be widely used to support objects that are deformed or displaced by heat.

As explained above, the support member using bimetal of the present invention supports a supported object that is deformed or displaced by heat, and by adopting a reverse contact bimetal with a curved part formed, it can be made small and large. It is possible to obtain a large amount of elongation, and therefore it is possible to provide support in a limited narrow space and to support a supported object with a large amount of elongation.

Further, since the reverse bimetal has a curved portion and has elasticity in the lateral direction in addition to displacement in the longitudinal direction, it can absorb a wide range of deformation and displacement of the supported object.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the present invention, and FIGS. 2 and 3 are side views showing the state of the support member before bending. DESCRIPTION OF SYMBOLS 1... Valve, 2... Shadow mask, 3... Support member, 3a, 3b... Bimetal, 6, 6 and 7, 7... ···Metal piece.

Claims (1)

[Claims] 1 One end of a reverse bimetal with a curved part is made by connecting several sets of bimetals with different overlapping positions of two metal pieces with different coefficients of thermal expansion to a fixed part, and the other end is attached to a supported part. A support member using bimetal that is characterized by being attached to an object.