JPH09289619A - Crt mount case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply mount a CRT on the case independently of the kind of a CRT tightening band by using a rib in direct press contact with a tube screen of the CRT so as to lock the tube screen of the CRT. SOLUTION: Plural ribs 12 are formed in a circumferential ridge of an opening 11a through which an image display screen of a CRT 2 is seen externally and the ribs 12 are directly locked to the tube screen of the CRT 2 to position and hold the CRT 2. The positioning of the CRT 2 is attained without use of any adjustment jig by allowing the tube screen of the CRT 2 to receive the ribs 12 with a low height. Since no complicated shape is designed for the ribs 12, no shrinkage is caused in an external appearance of the case, the strength of the metallic die itself is sufficient and then the television receiver is used for a long time in an excellent way. Furthermore, the ribs are applied to several kinds of CRTs 2 with a CRT tightening band 2a of a different size.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CRT mounting housing which is provided with ribs for directly locking a CRT tube surface to facilitate positioning of the CRT.

[0002]

2. Description of the Related Art CRTs are used for direct-view displays used in word processors, personal computers, and the like.
Most of them use (cathode ray tube), and a display using this type of CRT has a C having an opening for forming an image frame.
It is covered with the RT mounting housing. In the CRT mounting housing, it is usual that the peripheral edge of the opening portion is brought into contact with the peripheral edge of the image display surface of the CRT, and in that state, the four corners of the inner wall portion are connected and fixed to the CRT.
For example, by attaching mounting brackets extending from the CRT fastening band to the bosses protruding from the four corners of the inner wall surface on the front side of the CRT mounting casing and screwing the set screw to fix the mounting brackets to the boss, The CRT is integrated.

A conventional CRT mounting housing 1 of this type shown in FIG. 3 is integrally molded of a plastic resin material.
Moreover, the boss 1 is cantilevered at the four corners of the opening 1a.
Since the weight of the CRT 2 is supported by b, a concentrated load acts on the root portion of the boss 1b.
In particular, a large bending moment acts on the root portions of the two bosses 1b on the left and right that support the weight of the CRT 2 on the lower side, so that the end side of the boss 1b sinks more than the root side with the lapse of use period. Is likely to occur. As a result, the bottom edge bottom surface of the CRT 2 supported by the two left and right bosses 1b sinks below the normal support position, and the image of the CRT 2 particularly near the center of the bottom edge of the opening 1a of the CRT mounting housing 1 is displayed. A gap, which did not exist at the beginning of manufacture, sometimes occurred between the display surface and the display surface. Such a gap not only deteriorates the appearance and reduces the commercial value of the appearance, but also allows dust in the room to enter the CRT mounting housing 1, which is one of the causes of accelerating the deterioration of the circuit board. It was

Further, the conventional CRT mounting housing 1 has a C
Bosses 1 protruding from four corners of the inner wall surface of the RT mounting housing 1 on the front side
The CRT 2 is attached by placing the mounting metal fitting 2b extending from the CRT fastening band 2a on the b side and screwing a set screw (not shown) to fix the mounting metal fitting 2b to the boss 1b. However, this mounting work needs to be performed by coaxially positioning the CRT 2 with respect to the CRT mounting housing 1. Therefore, first, the CRT mounting housing 1 is fixed to a predetermined position on the jig base 4, and then the CRT 2 is mounted from above. Was placed and positioned.
However, in the actual positioning work, the adjusting jig 5 with the adjusting rod 5a is fitted into the jig base 4 at four positions, and as shown in FIG. 4, the protruding length of the adjusting rod 5a is adjusted so that the CRT 2 does not tilt. The adjustment rod 5a is adjusted by abutting and locking the tip of the adjustment rod 5a on the CRT fastening band 2a.
The work of positioning by pressing the fastening band 2a evenly is very troublesome, and the work efficiency is low because the CRT 2 is mounted using the adjusting jig one by one. In addition, an adjustment jig 5 is required for each manufacturing line.
Therefore, there is a drawback that the manufacturing cost is increased.

On the other hand, in order to eliminate the drawbacks of the conventional CRT mounting housing 1 and to position the CRT 2 without using the adjusting jig 5, a plurality of ribs are provided on the periphery of the opening and the CRT 2 is positioned by these ribs. A CRT mounting housing that is designed to be held is proposed. For example, in the CRT mounting housing 6 shown in FIG. 5, a plurality of ribs 7 that are engaged with the CRT fastening band 2a are provided so as to protrude from the peripheral edge of the opening 6a.
The weight of is distributed to and supported by the plurality of ribs 7. Since the rib 7 is pressed and deformed at a position where it hits the CRT fastening band 2a as shown in FIG. 6, a plurality of ribs 7 are arranged in two rows in a staggered pattern and even if the ribs 7 in the inner row are deformed. The ribs 7 in the outer row are designed so as not to be deformed.

[0006]

In the above-mentioned conventional CRT mounting housing 6, the rib 7 uniformly presses the CRT fastening band 2a, so that the CRT 2 with respect to the CRT mounting housing 6 is pressed.
However, since the ribs 7 have a complicated shape in which they are arranged in two rows in a staggered pattern, and the height of the ribs 7 arranged in two rows is considerably high,
When the draft taper when molding the CRT mounting housing 6 with a mold is taken into consideration, the ratio of the width Ty of the vertical beam 7b to the width Tx of the horizontal beam 7a of the rib 7 is Ty / Tx, which is an ideal ratio 1.
However, there was a problem that sink marks are likely to occur on the molding surface forming the housing appearance. In addition, since the ribs 7 arranged in two rows in a staggered pattern are used, the shape of the mold becomes complicated, and the mold strength is likely to be weakened accordingly, and when repeated molding is performed, relatively early. There were problems such as cracking of the mold. Furthermore, CR
The size and shape of T2 are protected by the manufacturer regardless of the manufacturer. However, the thickness of the CRT fastening band 2a that fastens the connecting portion between the front tube portion and the rear tube portion of the CRT2 varies depending on the manufacturer. Therefore, it is necessary to take measures such as matching the shape of the rib 7 according to the size and shape of the CRT fastening band 2a, or slightly shifting the locking position of the rib 7 depending on the size and shape of the CRT fastening band 2a. There were problems such as the need for jigs in some cases.

The present invention has solved the above-mentioned problems. The CRT tube surface is locked by a rib that directly abuts the CRT tube surface, and the CRT can be easily attached regardless of the type of the CRT fastening band. The purpose is to do so.

[0008]

In order to achieve the above-mentioned object and solve the above-mentioned problems, the present invention has a frame-like shape having an opening through which the image display surface of a CRT can be seen outside.
The CRT mounting housing mounted so as to cover the T is provided with a plurality of ribs which are formed on the peripheral edge of the opening and are directly engaged with the tube surface of the CRT to position and hold the CRT. .

Further, according to the present invention, the rib is the CRT.
A curved locking surface that locks to the curved surface at the peripheral edge of the image display surface of the tube surface.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 shows the C of the present invention.
FIG. 1 is a rear view showing an embodiment of the RT mounting housing, and FIG.
FIG. 2 is a cross-sectional view taken along the line II-II of the CRT mounting housing shown in FIG.

A CRT mounting housing 11 shown in FIG. 1 is assembled by joining a front housing and a rear housing, which are molded by pouring a plastic resin material such as polystyrene into a mold. The front casing is a frame-shaped casing that surrounds the front half of the CRT2, and the rear casing is a box-shaped casing that covers the rear half of the CRT2. Here, the front and rear casings are the same CRT.
We will handle them collectively as a mounting housing.

At the center of the front side of the CRT mounting housing 11,
An opening 11a is formed to make the image display surface of the CRT 2 look outside and form an image frame. Reference numeral 11b denotes a boss integrally provided at four corners of the inner wall surface on the front side of the CRT mounting housing, and a set screw for inserting the mounting metal fitting 2b extending from the CRT fastening band 2a is screwed into the boss.

On the inner wall surface on the front side of the CRT mounting housing 11,
A plurality of ribs 12 for directly receiving the tube surface of the CRT 2 are integrally formed along the peripheral edge of the opening 11a at substantially constant intervals in the circumferential direction. These ribs 12 are CRT fastening bands 2
It does not receive a but directly receives the peripheral edge of the tube surface of the CRT 2 and plays a role of positioning and holding the CRT 2. That is, as shown in FIG. 2, each rib 12 has a curved locking surface 12a that locks with the curved surface of the peripheral edge of the image display surface of the tube surface of the CRT 2, and each curved locking surface 12a is Each of the CRTs 2 has a shape that conforms to the outer contour shape of the CRT 2 taken along a plane parallel to the vertical cross section along the central axis thereof.

When mounting the CRT 2 on the CRT mounting housing 11, first, the CRT mounting housing 11 is placed at a predetermined position on an assembly table (not shown). Next, the CRT 2 to be mounted is assembled from above on the CRT mounting housing 11 with the image display surface facing downward. At this time, the curved surface of the peripheral surface of the image display surface of the tube surface of the CRT 2 is locked by the curved locking surface 12a of the rib 12, and the central axis of the CRT 2 penetrates the center of the opening of the CRT mounting housing 11. Therefore, when the tube surface of the CRT 2 is brought into contact with and locked by the rib 12, the rib 12 itself positions and holds the CRT 2 in a predetermined posture as an adjusting jig. At this time, the rib 12 locked to the curved surface of the peripheral surface of the image display surface of the tube surface of the CRT 2 regulates the position of the CRT 2 itself not only in the front-back direction but also in the vertical direction and the horizontal direction. In this way, the CRT 2 is positioned and held at a predetermined position of the CRT mounting housing, and finally, the mounting metal fittings 2b at the four corners of the CRT fastening band 2a are screwed to the boss 11b by the respective setscrews to complete the mounting of the CRT 2.

In this way, the CRT mounting housing 11 is
Since the tube surface of the CRT 2 is directly received by the plurality of ribs 12 projecting on the peripheral edge of the opening of the front housing, the CRT fastening band 2a wound around the outer surface of the tube surface of the CRT 2 is received by the plurality of ribs 7. Like the conventional CRT mounting housing 6, in order to cope with the difference in the size of the CRT fastening band 2a depending on the manufacturer, the shape of the rib 7 is matched or the rib 7 is locked according to the dimension and shape of the CRT fastening band 2a. There is no need to move the position slightly, and the CRT
2 can be installed efficiently in a short time. Moreover, since the rib 12 itself may be short, the wall thickness of the base end portion of the rib 12 can be reduced even in consideration of the punch taper from the mold. Further, since the rib 12 has a simple shape and may be thin, there is no sink mark that significantly impairs the appearance quality of the CRT mounting housing 11, and the structure of the mold does not become complicated. Sufficient strength can be obtained. Further, as shown in FIG. 2, since an empty space 13 is formed between the outer circumference of the CRT fastening band 2a and the inner wall of the CRT mounting housing 11, it is possible to wind a degaussing coil here, which is wide. The space inside the housing can be effectively used.

Further, in the CRT mounting housing 11 to which the CRT 2 is mounted, the bosses 11b at the four corners are CR through the mounting brackets 2b.
In addition to supporting the weight of T2, the ribs 12 that receive the tube surface of the CRT 2 support the weight of the CRT 2, and in particular, the ribs 12 receive the gravity acting on the central portion of the CRT 2 in a distributed manner. The bottom surface of the lower edge does not sink below the proper support position. In addition, the CRT mounting housing 1
There is no gap between the opening 11a of No. 1 and the image display surface of the CRT 2 and the appearance is not deteriorated, and the commercial value of the exterior is not deteriorated, and dust in the room is attached to the CRT through the gap. It does not invade into the housing 11 and contribute to hastening the deterioration of the substrate circuit. In addition, even when used in a high temperature environment for a long time, since there is no gap between the opening 11a of the CRT mounting housing 11 and the image display surface of the CRT 2, a certain quality is maintained over a long period of time. can do.

[0017]

As described above, according to the present invention,
Since the CRT tube surface is directly received by a plurality of ribs protruding from the peripheral edge of the opening of the front housing, the CRT fastening band wound around the CRT tube surface is received by a plurality of ribs in the conventional CRT. In order to cope with the difference in the dimensions of the CRT fastening band depending on the manufacturer like the mounting housing,
It is not necessary to match the shape of the rib according to the size and shape of the CRT fastening band or to slightly shift the locking position of the rib, and the CRT can be mounted efficiently in a short time. Can be made short, so the wall thickness of the rib base end can be reduced even if the taper from the die is taken into consideration, and the rib shape is simple and thin, so the appearance quality of the housing is good. Since there is no sink mark that significantly damages the mold, and the structure of the mold does not become complicated, sufficient strength can be obtained as a mold, and an empty space is formed between the outer circumference of the CRT fastening band and the inner wall of the housing. Therefore, it is possible to wind a degaussing coil around here, and it is possible to effectively use the widened space inside the housing. Furthermore, in the CRT mounting housing where the CRT is mounted, the bosses at the four corners are connected to the CRT via the mounting brackets. The weight of In addition, the ribs that receive the CRT tube surface support the weight of the CRT, and in particular, the ribs receive the gravity acting on the central portion of the CRT in a distributed manner. Of the CRT mounting housing and the CR
There is no gap between the image display surface of T and the visual impression, and the commercial value of the appearance is not deteriorated.
Also, dust inside the room will not enter the CRT mounting housing through the gaps, which will not be a factor in accelerating the deterioration of the circuit board, and even if it is used in an environment where viewing is performed at high temperature for a long time, the CRT mounting Since there is no gap between the opening of the housing and the image display surface of the CRT, it is possible to maintain an excellent quality over a long period of time.

Further, in the CRT mounting housing of the present invention, the rib has a curved locking surface for locking the curved surface of the peripheral surface of the image display surface of the CRT.
The curved locking surface of the rib locks on the curved surface of the peripheral edge of the image display surface of the tube surface of the CRT, and regulates the position of the CRT itself not only in the front-back direction but also in the up-down direction and the left-right direction. There is an effect that it can be sufficiently increased.

[Brief description of drawings]

FIG. 1 is a rear view showing an embodiment of a CRT mounting housing of the present invention.

FIG. 2 is a sectional view taken along line II-II of the CRT mounting housing shown in FIG.

FIG. 3 is a rear view showing an example of a conventional CRT mounting housing.

FIG. 4 is a cross-sectional view taken along the line IV-IV of the mounting housing shown in FIG.

FIG. 5 is a rear view showing another example of the conventional CRT mounting housing.

FIG. 6 is a partially enlarged perspective view of the CRT mounting housing shown in FIG.

[Explanation of symbols]

 11 CRT Mounting Housing 11a Opening 11b Boss 12 Rib 12a Curved Locking Surface 13 Empty Space

Claims (2)

[Claims] 1. A CRT mounting housing, which is formed into a frame having an opening through which the image display surface of the CRT can be seen to the outside, and which is formed in plural at the periphery of the opening in a CRT mounting housing mounted to cover the CRT. CRT characterized by being provided with ribs which are locked directly to the pipe surface and position and hold the CRT.
Mounting housing. 2. The CRT mounting housing according to claim 1, wherein the rib includes a curved locking surface that locks with a curved surface of the peripheral surface of the image display surface of the tube surface of the CRT.