JP2005295009A - Crt display with top plate sagging preventing rib - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a CRT display which has an enlarged display screen (cabinet) and a thinned cabinet and easily and cheaply prevents the top plate of the cabinet from sagging. <P>SOLUTION: Reinforcing ribs 111a, 111b formed on the top plate of a front cabinet 11 are partly extended like a plate to form top plate sagging preventing ribs 23a, 23b. Even in the condition of a load exerted on the top plate 11a of the front cabinet 11, the top plate sagging preventing ribs 23a, 23b and a CRT display tube 15 support the load to prevent the top plate 11a from sagging. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a CRT display device, and more particularly to a CRT display device provided with a top plate bending prevention rib that prevents the top plate of a cabinet from bending.

  Display devices using a cathode ray tube (CRT) have become widespread as television receivers and the like, and display screens have become wider and larger. Since a CRT display tube provided in such a CRT display device is generally attached to a cabinet (particularly a front cabinet) by screwing, the front cabinet needs to hold a considerable amount of weight. The cabinet is generally molded from resin for reasons such as cost and ease of manufacture, and if it is formed by simply combining a flat plate on the side, the strength to retain the weight described above is used. Therefore, many reinforcing ribs and the like are provided on the inner surface side of the cabinet.

  Conventional techniques relating to ribs and the like for reinforcing the cabinet of such a CRT display device are disclosed in Patent Documents 1 to 3, and the like.

Registered Utility Model No. 3082213 Registered Utility Model No. 3089348 Japanese Patent Laid-Open No. 9-284678

  As described above, CRT display devices are becoming wider and larger in display screen. As a result, the size of the cabinet is naturally large, and the length of one side constituting the cabinet is also long. Therefore, when a load is applied to the cabinet, the distance between the side surface of the cabinet that supports the load and the point where the load is applied becomes long, and the bending moment increases, resulting in the deflection of the cabinet (the size of the recess) A) also increases. In recent years, there has been a demand for thinner cabinets from the viewpoint of weight reduction and environmental problems. However, since the second moment of the cross section becomes very small when the thickness is reduced in this way, the cabinet as described above. The problem of deflection is increased.

  The above-described problem of cabinet deflection is caused by the user placing an object (for example, a video recording device) on the television, and is particularly noticeable at the top plate of the cabinet. Thus, the problem that the top plate of the cabinet is recessed not only deteriorates the impression of the user but also may adversely affect the members provided in the CRT display device (for example, the inside of the top plate of the cabinet). The rib provided in the contact with the degauss coil provided in the CRT display tube may damage the coating of the degauss coil).

  On the other hand, in the prior arts such as the above-mentioned patent documents, the position and shape of the ribs have been devised, but any attempt to increase the strength of the cabinet itself by forming reinforcing ribs or the like. It was a thing. Providing reinforcing ribs in this way is an effective means and can achieve a certain result. However, since the cabinet body and the reinforcing ribs are integrally formed of resin, the strength (bending can be obtained). (Rigidity) had a certain limit. Moreover, increasing the number of reinforcing ribs or forming the reinforcing ribs having a complicated shape increases the manufacturing cost due to an increase in the cost of the mold.

  In view of the above-mentioned problems, the present invention can easily and inexpensively prevent the top plate of the cabinet from being recessed in a CRT display device in which the display screen (cabinet) is enlarged and the cabinet is thinned. It is an object of the present invention to provide a CRT display device that can perform the above-mentioned.

  The CRT display device having the top plate bending prevention rib according to claim 1 is a CRT display device in which a CRT display tube is provided in a cabinet having an opening window portion so that an image display area is exposed by the opening window portion. The top of the cabinet is arranged on the inner side of the top plate of the cabinet so that the distance from the upper surface of the CRT display tube is a predetermined distance or substantially in contact with the upper surface of the CRT display tube. The top plate bending prevention rib is formed by extending downward from the inside of the plate portion.

  According to the CRT display device having the top plate deflection preventing rib having the above-described configuration, the top plate deflection preventing rib is spaced from the upper surface of the CRT display tube at a predetermined distance on the inner side of the top plate portion of the cabinet, or Since the load is applied to the cabinet top plate and the cabinet top plate is bent by a predetermined distance, the top plate deflection preventing rib and the upper surface of the CRT display tube come into contact with each other. When the load is applied to the cabinet top plate, the load is supported by the top plate deflection preventing rib and the CRT display tube almost simultaneously.

  A CRT display device having a top plate bending prevention rib according to claim 2 is the CRT display device having the top plate bending prevention rib according to claim 1, wherein a lower end of the top plate bending prevention rib and the CRT display tube are provided. The top plate bending prevention rib is formed so that the distance from the upper surface of the plate becomes 5 mm or less.

  According to the CRT display device having the top plate bending prevention rib having the above configuration, the top plate bending prevention rib and the CRT display tube can be obtained by bending the cabinet top plate by 5 mm at the maximum when a load is applied to the cabinet top plate. The load is supported by the top plate bending prevention rib and the CRT display tube.

  The CRT display device having the top plate deflection preventing rib according to claim 3 is the CRT display device having the top plate deflection preventing rib according to claim 1 or 2, wherein the entire width of the cabinet is divided into three equal parts. One or a plurality of the top plate bending prevention ribs are provided in a range that becomes a central portion of the top plate.

  According to the CRT display device having the top plate bending prevention rib having the above-described configuration, the top plate bending prevention rib is formed at the central portion of the top plate portion, which tends to have insufficient bending rigidity. In other words, a portion near the side portion on the back side of the front side of the cabinet (near the four corners of the opening window) is usually formed with many bosses for screwing the CRT display tube and reinforcing ribs for reinforcing the bosses. Therefore, the rigidity of the part near the side part of the top plate is high, and the bending moment is small because it is close to the side part. Is a portion where the bending moment is increased because the distance from the side surface of the cabinet is increased. According to the CRT display device of the present invention, the top plate is bent at the center portion of the top plate. A prevention rib is formed.

  A CRT display device provided with the top plate deflection preventing rib according to claim 4 is the CRT display device comprising the top plate deflection preventing rib according to any one of claims 1 to 3, wherein the cabinet includes: The top plate bending prevention rib is constituted by a front cabinet and a rear cabinet, and is formed by extending a part of a reinforcing rib provided on the inner side of the top plate portion of the front cabinet downward. And

  According to the CRT display device having the top plate bending prevention rib having the above configuration, the top plate bending prevention rib is formed by extending a part of the reinforcing rib downward. The length (extension distance) is small.

  The CRT display device having the top plate bending prevention rib according to claim 5 is the CRT display device having the top plate bending prevention rib according to any one of claims 1 to 3, wherein the cabinet includes: The top cabinet is configured by a front cabinet and a rear cabinet, and the top plate deflection preventing rib extends downward from the inside of the top plate of the rear cabinet, or the inside of the top of the rear cabinet. It is characterized by being formed by extending a part of the reinforcing rib provided in the lower part.

  The CRT display device provided with the top plate deflection preventing rib according to claim 6 is the CRT display device comprising the top plate deflection preventing rib according to claim 4 or 5, wherein the top plate deflection preventing rib comprises: It is formed so that it may be located in the vertically downward part of the junction part of the said front cabinet and the said rear cabinet.

  According to the CRT display device having the top plate bending prevention rib having the above-described configuration, in the vertically lower part of the joint portion between the front cabinet and the rear cabinet, which is a portion where stress concentration is likely to occur because the cross-sectional shape changes rapidly, A top plate bending prevention rib is formed in contact with the upper surface of the CRT display tube.

  The CRT display device according to the first aspect of the present invention is provided with a CRT display tube having an image display area exposed by the opening window portion in a cabinet having an opening window portion, on the inner side of the top plate portion of the cabinet. Further, it extends downward from the top side of the cabinet so that the distance from the upper surface of the CRT display tube is a predetermined distance or substantially in contact with the upper surface of the CRT display tube. According to the CRT display device having the top plate bending prevention rib, which is characterized by forming the top plate bending prevention rib, a load is applied to the cabinet top plate and the cabinet top plate is bent by a predetermined distance. The top plate deflection preventing rib and the upper surface of the CRT display tube are in contact with each other, and the load is supported by the top plate deflection preventing rib and the CRT display tube. It can be effectively prevented. Further, since the bending rigidity of the cabinet top plate itself does not necessarily have to be increased by such a configuration, it is not necessary to increase or complicate the ribs for reinforcing the cabinet top plate. Etc., and the manufacturing cost of the CRT display device can be reduced. Further, since the contact portion between the upper surface of the CRT display tube and the top plate bending prevention rib can be determined in advance, the members (reinforcing ribs and the like) provided on the cabinet top plate inside side when the cabinet top plate is bent. However, it is possible to prevent problems caused by unintentional contact with members provided in the CRT display tube (for example, contact with the degauss coil and damage the coating of the degauss coil).

  The top plate deflection preventing rib according to claim 2 of the present invention, wherein the top plate deflection preventing rib is formed so that a distance between a lower end of the top plate deflection preventing rib and an upper surface of the CRT display tube is 5 mm or less. According to the CRT display device provided with the top plate bending prevention rib according to 1, the space between the lower end of the top plate bending prevention rib and the upper surface of the CRT display tube is “5 mm or less”, so that the cabinet top plate is 5 mm or more. Bending is prevented. Further, if the distance between the lower end of the top plate bending prevention rib and the upper surface of the CRT display tube is set to “1 mm or more”, variations in the outer dimensions due to manufacturing errors of the CRT display tube are absorbed.

  One or a plurality of the top plate bending prevention ribs are provided in a range of a central portion of the cabinet obtained by dividing the entire width of the cabinet into three equal parts. According to the CRT display device provided with the top plate bending prevention rib according to any one of claims 2, the top portion of the top plate portion where the bending rigidity is apt to be insufficient and a large bending moment is applied. Since the plate bending prevention ribs are formed, the cabinet top plate can be effectively prevented from being bent without providing a large number of top plate bending prevention ribs.

  The cabinet according to claim 4 of the present invention is constituted by a front cabinet and a rear cabinet, and the top plate bending prevention rib is provided below a part of the reinforcing rib provided on the inner side of the top plate portion of the front cabinet. 4. The CRT display device having a top plate deflection preventing rib according to claim 1, wherein the top plate deflection preventing rib is reinforced. Since the rib is formed by extending a part of the rib downward, the size (extension distance) of the top plate bending prevention rib itself is small, and the book is obtained by making a small-scale modification to the conventional front cabinet. The CRT display device provided with the top plate bending prevention rib according to the invention can be manufactured.

  The top plate bending prevention rib according to claim 6 of the present invention is formed so as to be positioned in a vertically lower portion of a joint portion between the front cabinet and the rear cabinet. According to the CRT display device provided with the top plate bending prevention rib described in 5, the vertical lower portion of the joint portion between the front cabinet and the rear cabinet, which is a portion where stress concentration is likely to occur due to a sudden change in cross-sectional shape ( In other words, since the top plate bending prevention rib that abuts the upper surface of the CRT display tube is formed in the portion where the depression is most likely to occur, the cabinet top plate is effectively prevented from being bent.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. The following embodiment is one form when the present invention is embodied, and is not intended to limit the present invention within the scope thereof.

  FIG. 1 is a perspective view showing an outline of a CRT display device provided with a top plate bending prevention rib of this embodiment, and FIG. 2 is an exploded perspective view for showing an outline of the configuration of the CRT display device. FIG. 3 is a rear view of the front cabinet, FIG. 4 is an enlarged perspective view of a portion of the front cabinet provided with a top plate bending prevention rib, and FIG. 5 is a rear view of the top plate portion of the front cabinet.

  A CRT display device 10 (hereinafter simply referred to as a CRT display device 10) having a top plate bending prevention rib according to the present embodiment is provided in a housing constituted by a front cabinet 11 and a rear cabinet 12, as shown in FIGS. Further, a CRT display tube 15, a main circuit board 14, a speaker 16 and the like are provided. The front cabinet 11 having the opening window 11c is provided with a CRT display tube 15 with the image display area exposed by the opening window 11c, and the lower part of the front cabinet 11 performs processing of video / audio signals. A main circuit board 14 is provided, and speakers 16 are arranged on both sides of the front cabinet 11 in consideration of acoustic effects. The CRT display tube 15 is provided with an explosion-proof band 17, a degauss coil 13, and the like, and a lug 18 for attaching to the front cabinet 11 by screwing.

  As shown in FIGS. 3 to 5, a reinforcing rib 111 and a boss 112 for screwing the CRT display tube 15 to the front cabinet 11 via lugs 18 are provided on the inner surface side of the front cabinet 11. . The top plate bending prevention ribs 23a and 23b are formed by extending a part of the reinforcing ribs 111a and 111b provided in the top plate portion of the front cabinet 11 downward in a plate shape. As shown in FIGS. 5 and 6, in this embodiment, the top plate bending prevention ribs 23 a and 23 b are formed so as to substantially contact the upper surface of the CRT display tube 15.

  Further, the diagonal inch number of the screen of the CRT display device 10 of this embodiment is 24 inches, and the total width D of the front cabinet 11 is 655 mm. As shown in FIG. 5, the top plate bending prevention ribs 23a and 23b are formed by extending a part of the reinforcing ribs 111a and 111b whose distance X from the side surface portion of the front cabinet 11 is 220 mm downward. The front cabinet 11 is provided in a range that is a central portion of the entire width of the front cabinet 11 divided into three (218 mm).

  6 is a cross-sectional view taken along line AA in FIG. 5 and is an enlarged view of a portion provided with the top plate bending prevention rib 23a. The reinforcing rib 111a provided on the top plate portion 11a of the front cabinet 11 is formed so as to protrude from the rear end portion of the top plate portion 11a, and is a fitting portion provided on the front end portion of the top plate portion 12a of the rear cabinet 12. A cut portion 111a1 (FIG. 4) for sandwiching 12a1 with the top plate portion 11a is formed. As shown in FIG. 6, the top plate bending prevention rib 23 a is formed to be a vertically lower portion of the joint portion between the front cabinet 11 and the rear cabinet 12. The front cabinet 11, the reinforcing rib 111, and the top plate bending prevention rib 23 are integrally formed of resin.

  FIG. 12 is a cross-sectional view schematically showing a top plate portion of a CRT display device 120 which is an example of a conventional CRT display device. As shown in FIG. 12, in the CRT display device 120 of the conventional example, when the load F is applied to the top plate portion of the cabinet 121, not only does the top plate portion of the cabinet 121 dent, giving a bad impression to the user, The reinforcing rib 123 comes into contact with the degauss coil 125 and damages the coating of the degauss coil 125 (or depending on the shape of the cabinet 121 and the position of the anode terminal portion 127, the cabinet 121 and the anode terminal portion 127 are in contact with each other. However, according to the CRT display device 10 of this embodiment, the load F is held by the top plate bending prevention rib 23 and the CRT display tube 15 as shown in FIG. For this reason, the top plate portions of the front cabinet 11 and the rear cabinet 12 are not depressed. , With it not give a bad impression to the user, is prevented troubles such damage a coating of degaussing coil 13. Moreover, since the front cabinet 11 and the CRT display tube 15 have a more integrated structure by adopting the configuration as described above, the bending rigidity itself of the top plate portions 11a and 12a does not necessarily have to be increased. There is no need to increase or complicate the ribs for reinforcing the top plate portions 11a and 12a of the front cabinet 11 and the rear cabinet 12, and the manufacturing cost of the CRT display device 10 can be reduced.

  Further, the top plate bending prevention rib 23 has a vertically lower portion (that is, a portion where the depression is most likely to be generated) of the joint portion between the front cabinet 11 and the rear cabinet 12, which is a portion where stress concentration is likely to occur due to a sudden change in cross-sectional shape. ), The deflection of the cabinet top plate is effectively prevented. Moreover, since the top plate bending prevention rib 23 is formed by extending a part of the reinforcing rib 111 downward in a plate shape, the present invention can be achieved by making a small-scale modification to the conventional front cabinet. The CRT display device provided with the top plate bending prevention rib according to the above can be manufactured. Further, as shown in FIGS. 3 and 5, a boss 112 for screwing the CRT display tube 15 is provided in a portion close to the side portion on the back side of the front surface of the front cabinet 11 (near the four corners of the opening window portion 11c). Since many reinforcing ribs 111 for reinforcing this are formed and the rigidity of the portion close to the side surface portion of the top plate portion 11a is high, in the CRT display device 10 of this embodiment, the top plate is bent at this portion. Without forming the prevention ribs 23, the top plate bending prevention ribs 23 are formed only in the central portion where the number of reinforcing ribs 111 is small and the bending rigidity is insufficient. Without being provided, the cabinet top plate can be effectively prevented from being bent, and the CRT display device having the top plate deflection preventing rib according to the present invention can be manufactured at low cost.

  In this embodiment, the top plate bending prevention rib 23 is integrally formed with the front cabinet 11 and the resin by extending a part of the reinforcing rib 111a into a plate shape. It may be formed by extending the top plate bending prevention rib directly from the inner surface of the cabinet top plate portion 11a, or may be joined after the top plate bending prevention rib is formed separately. It may be allowed. In the present embodiment, two top plate bending prevention ribs 23 (top plate bending prevention ribs 23a and 23b) are provided near the center of the top plate portion 11a. However, the present invention is not limited to this. The position and number of the top plate bending prevention ribs are appropriately selected depending on the bending rigidity of the top plate portion, the assumed load F, the cabinet size, and the like.

  FIG. 7 is a perspective view showing an outline of a CRT display device having a top plate bending prevention rib of this embodiment, FIG. 8 is a plan view seen from the inner surface side of the rear cabinet, and FIG. 9 is seen from the inner surface side of the front cabinet. It is a top view. FIG. 10 is an enlarged perspective view of a portion of the rear cabinet provided with a top plate bending prevention rib.

  The basic configuration of the CRT display device 70 (hereinafter simply referred to as CRT display device 70) having the top plate bending prevention rib of the present embodiment is the same as that of the CRT display device 10 of the first embodiment. The same reference numerals as those in the first embodiment are used for the constituent elements, and the description thereof is omitted here.

  As shown in FIGS. 8 and 10, the top plate bending prevention rib 73 is formed by extending a plate-like rib downward from the inner side of the top plate portion 72 a at a substantially central portion in the width direction of the rear cabinet 72. It is formed. FIG. 11 is a cross-sectional view taken along line BB in FIG. 8 and is an enlarged view of a portion provided with the top plate bending prevention rib 73. As shown in FIG. 11, the top plate bending prevention rib 73 is vertically below the joint portion between the front cabinet 71 and the rear cabinet 72, and the lower end of the top plate bending prevention rib 73 and the CRT display tube 15. It is formed so that the distance y from the upper surface of the substrate is about 2 mm.

  According to the CRT display device 70 of this embodiment, the top plate portions of the front cabinet 71 and the rear cabinet 72 can be effectively prevented from being recessed, and the distance between the lower end of the top plate deflection preventing rib 73 and the upper surface of the CRT display tube 15. Is about 2 mm, the variation in the outer dimensions due to the manufacturing error of the CRT display tube 15 is absorbed.

  In the first embodiment and the present embodiment, as shown in FIGS. 6 and 11, the top plate deflection preventing rib 23 or the top plate deflection preventing rib 73 is substantially horizontal in the front portion of the funnel portion of the CRT display tube 15. However, the present invention is not limited to this, and the top plate bending prevention rib is in contact with the inclined portion at the rear of the funnel portion. Such a configuration may be adopted, and it is appropriately adapted depending on the positional relationship between the joint portion of the front cabinet and the rear cabinet, the balance with the internal structure of the CRT display device, and the like.

The perspective view which shows the outline of the CRT display apparatus provided with the top-plate bending prevention rib of Example 1. FIG. Example 1 An exploded perspective view for schematically showing a configuration of a CRT display device. Top view of the front cabinet from the inside An enlarged perspective view of a portion of the front cabinet provided with a top plate bending prevention rib Rear view of the top panel of the front cabinet Sectional drawing along the AA line of FIG. The perspective view which shows the outline of the CRT display apparatus provided with the top-plate bending prevention rib of Example 2. FIG. Top view of the rear cabinet as seen from the inside Top view of the front cabinet from the inside An enlarged perspective view of a portion of the rear cabinet provided with a rib for preventing the top plate from bending Sectional drawing along the BB line of FIG. Sectional drawing of the top-plate part of the CRT display apparatus of a prior art example

Explanation of symbols

10, 70 CRT display device 11, 71 Front cabinet 11a Top plate (front cabinet)
11c Open window 12, 72 Rear cabinet 12a Top panel (rear cabinet)
15 CRT display tube 23a, 23b, 73 Top plate bending prevention rib 111 Reinforcement rib

Claims (6)

  A CRT display device in which a CRT display tube is provided in a cabinet having an opening window portion so that a video display area is exposed by the opening window portion, and the upper surface of the CRT display tube is disposed inside the top plate portion of the cabinet. The top plate deflection preventing rib is extended downward from the top side of the cabinet so that the distance between the top and bottom of the CRT display tube is substantially in contact with the CRT display tube. A CRT display device provided with a top plate bending prevention rib, characterized in that is formed.   2. The top plate deflection preventing rib according to claim 1, wherein the top plate deflection preventing rib is formed so that a distance between a lower end of the top plate deflection preventing rib and an upper surface of the CRT display tube is 5 mm or less. A CRT display device comprising:   3. The top plate according to claim 1, wherein one or a plurality of the top plate bending prevention ribs are provided in a range that becomes a central portion of the entire width of the cabinet divided into three. 3. A CRT display device provided with a bending prevention rib.   The cabinet is constituted by a front cabinet and a rear cabinet, and the top plate bending prevention rib is formed by extending a part of a reinforcing rib provided on the inner side of the top plate portion of the front cabinet downward. A CRT display device comprising the top plate deflection preventing rib according to any one of claims 1 to 3.   The cabinet is constituted by a front cabinet and a rear cabinet, and the top plate bending prevention rib extends downward from the inside of the top plate portion of the rear cabinet, or the top plate portion of the rear cabinet. 4. A CRT having a top plate bending prevention rib according to claim 1, wherein a part of the reinforcing rib provided on the inner side of the base plate is extended downward. Display device.   The top plate bending prevention according to claim 4 or 5, wherein the top plate bending prevention rib is formed so as to be positioned in a vertically lower portion of a joint portion between the front cabinet and the rear cabinet. CRT display device with ribs.

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