JPH10207388A - Attaching structure for display tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide attaching structure for a display tube with which the display tube can be surely fixed even without a display tube holder being an independent member. SOLUTION: Relating to an equipment having such a structure that a printed wiring board 3 is attached onto a chassis 2 at the base wall section of a casing 1 opening its front face, a front panel 6 forming a display window 7 is attached onto a front face opening part 5 of the casing 1 and a display tube 10 is attached to a front edge part 3a of printed wiring board 3 facing the display window 7 on this front panel 6, the display tube 10 is erected by directly connecting its connecting terminal 10a to a conductor pattern on the printed wiring board, both right and left side parts on the side of rear face 10b are respectively held by a pair of rib elements 2b formed at a prescribed interval at the front edge part 2a of the chassis 2, and the side of front face 10c is held by a projection 6a formed near the display window 7 on the front panel 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a mounting structure of a display tube incorporated in AV equipment such as a video tape recorder, an audio tape recorder, and a compact disk player.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional mounting structure of a display tube incorporated in AV equipment. In the figure, a printed wiring board 53 is attached to a chassis 52, which is a bottom wall portion of a housing 51 having an open front surface, by screwing or the like (not shown). The front opening 55 of the housing 51
A front panel 56 having a display window 57 formed therein is attached to the front panel 53. A front edge 53 a of the printed wiring board 53 facing the display window 57 of the front panel 56 is provided with a display tube 6.
0 is attached.

[0003] The connection terminals 60a of the display tube 60, 60a ...
.. Penetrate through holes 53b, 53b,... Formed in the printed wiring board 53, and are electrically connected to a conductor pattern (not shown) formed on the back side of the printed wiring board 53 by soldering or the like. Have been.
The display tube 60 is provided at both ends 6 by a pair of display tube holders 62, 62 attached to the printed wiring board 53.
0b and 60c are held, and the display tube holder 6
2, 62 mainly prevent swinging back and forth.

FIG. 5 is a perspective view showing the shape of a display tube holder 62, and FIG.
It is a cross-sectional view showing the state where b was fitted. That is, the display tube holder 62 holds the end portion 60b (or 60) of the display tube 60.
c) A fitting portion main body 62b having a fitting inlet 62a for fitting therein, and leg pieces 6 formed on the bottom surface of the fitting portion main body 62b.
2d, 62f and one inner surface 62 of the fitting portion main body 62b.
g, and a pair of upper and lower locking claws 62h, 62h. A locking piece 62c to be inserted into an insertion groove 53a formed in the printed wiring board 53 is formed at a lower end of the leg piece 62d. An insertion pin 62e to be inserted into an insertion hole (not shown) formed in the printed wiring board 53 is formed at the lower end of the leg piece 62f.

The locking claws 62h, 62h and the fitting body 62b
Of the display tube 60 is slightly smaller than the thickness of the display tube 60. Therefore, when the end portion 60b (or 60c) of the display tube 60 is fitted into the fitting portion main body 62b, the end portion 60b (or 60c) of the display tube 60 is locked by the elastic force of the locking claws 62h. 62h and the other inner side surface 62i of the fitting portion main body 62b are nipped and fixed.

As described above, both ends 60b, 6 of the display tube 60 are provided.
0c are held by the display tube holders 62, 62, respectively, and the locking pieces 62c, 62c of the display tube holders 62, 62 are held.
To each of the insertion grooves 53 formed in the printed wiring board 53.
a, 53a, and insert the respective insertion pins 62e, 62e into
The display tube 60 is fixed to the printed wiring board 53 by being inserted into each of the insertion holes (not shown) formed in the printed wiring board 53.

[0007]

In such a conventional mounting structure, the display tube holders 62 for holding the left and right ends 60b and 60c of the display tube 60 are required. There was a problem that the number of parts increased and the manufacturing cost was high. The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a display tube mounting structure capable of securely fixing a display tube without a display tube holder which is an independent member. Is to provide.

[0008]

According to the present invention, there is provided a display tube mounting structure according to the present invention, wherein a printed circuit board is mounted on a chassis which is a bottom wall portion of a housing having an open front surface. A front panel having a display window formed in a front opening of the housing is attached, and a display tube is attached to a front edge of the printed wiring board facing the display window of the front panel. The display tube is erected by connecting its connection terminals directly to the conductor pattern of the printed wiring board, and the rear surface is formed by a pair of rib pieces formed at a front edge of the chassis at a predetermined interval. The left and right sides of the front panel are held respectively, and the front side is held by a projection formed near the display window of the front panel. That is, by attaching a printed wiring board on which the display tube is erected only to the connection terminals to the chassis, the rear side of the display tube is first held by the rib pieces formed on the chassis, and the front panel is placed on the front opening of the housing. By attaching, the front side of the display tube is held by the protrusion formed on the front panel. In other words, when the display tube is in a finished product state, the display tube is held by the rib pieces formed on the chassis and the protrusions formed on the front panel so as to be sandwiched from front and rear.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a display tube mounting structure according to the present invention as viewed from a side, and FIG. 2 is a perspective view showing a state in which a printed wiring board is mounted on a chassis.

That is, a printed wiring board 3 is attached to a chassis 2 which is a bottom wall portion of a housing 1 having an open front surface by screwing or the like (not shown). Further, a front panel 6 having a display window 7 is attached to the front opening 5 of the housing 1. That is, chassis 2
The lower end bent piece 6 of the front panel 6 is provided on the lower surface of the front edge 2a of the
b is attached and attached by screwing or the like (not shown). Although not shown, the upper end of the front panel 6 is attached to, for example, the top wall of the housing 1 so as to be locked.

The front edge portion 3 of the printed wiring board 3 facing the display window 7 of the front panel 6 thus mounted.
The display tube 10 is attached to a. Further, a transparent panel 8 for protecting the display tube 10 is attached to the display window 7. Connection terminals 10a, 10 of display tube 10
a (actually, a large number are formed, but only two connection terminals 10a, 10a formed at both left and right ends are shown in the drawing) are formed on the printed wiring board 3. Penetrate through holes 3b, 3b.
It is electrically connected to a conductor pattern (not shown) formed on the back side of the printed wiring board 3 by soldering or the like. The display tube 10 is basically connected to the connection terminal 10.
a, only 10a...

Further, the connection terminals 1 at the left and right ends of the display tube 10 are provided.
The printed wiring boards 3 on both outer sides of the reference numerals 0a and 10a include:
A pair of cut grooves 3c, 3c extending from the front edge 3a to the rear edge (not shown) are formed. The cut grooves 3c, 3c are cut beyond the rear surface 10b of the standing display tube 10 to the rear edge side.

On the other hand, a front edge 2a of the chassis 2 on which the printed wiring board 3 is mounted has the same distance L as a pair of cut grooves 3b, 3b formed on the printed wiring board 3.
1, a pair of rib pieces 2b, 2b are formed. The rib pieces 2b, 2b stand up when they enter the rear edge (not shown) by a predetermined distance L2 from the front edge 2a, and the height of the upright pieces 2c, 2c is When the display tube 10 is mounted on the chassis 2, the height of the display tube 10 mounted on the printed wiring board 3 reaches at least halfway in the height direction. However, it may reach the upper end of the display tube 10. When the printed wiring board 3 is attached to the chassis 2, the fixed distance L 2 is set at a distance from the front edge 2 a of the chassis 2 to the printed wiring board 3.
Is the distance to the rear surface 10b of the display tube 10 attached to the display tube 10.

That is, the printed wiring board 3 to which the display tube 10 is mounted is simply mounted on the chassis 2 and the rib pieces 2b, 2b projecting upward through the cut grooves 3c, 3c of the printed wiring board 3 are provided. The left and right sides of the rear surface 10b of the display tube 10 are held from behind.

On the inner surface of the front panel 6, a plurality of projections 6a are formed around the display window 7. In the present embodiment, the projections 6a, 6a,... Are formed at two locations on the left and right sides of the upper edge of the display window 7 and at two locations on the left and right sides of the lower edge side, for a total of four locations. When the front panel 6 is attached to the front opening 5 of the housing 1, the protrusion length of the projection 6 a is a length that comes into contact with the front surface 10 c of the display tube 10 attached to the printed wiring board 3. . That is, just by attaching the front panel 6 to the front opening 5 of the housing 1, the front 10
The four upper, lower, left and right corners of c are held from the front by the projections 6a, 6a,.

That is, the connection terminals 10a, 1 of the display tube 10
. 0a... Are penetrated through through holes 3b, 3b... Formed in the printed wiring board 3 and connected to a conductor pattern on the back side by soldering or the like. To the upright pieces 2c, 2c of the rib pieces 2b, 2b formed on the chassis 2.
The rear surface 10b of the display tube 10 is held from the rear side, and then the front panel 6 is simply attached to the front opening 5 of the housing 1, and the display is performed by the projections 6a formed on the front panel 6. The front surface 10c of the tube 10 is held from the front side.

That is, when the display tube 10 is in a finished product state, the display tube 10 is formed from the front and rear by the rib pieces 2b, 2b formed on the chassis 2 and the projections 6a, 6a,. It is held in a sandwiched form. This can reliably prevent the display tube 10 from swinging back and forth, so that a conventional display tube holder is not required.

When the chassis 2 is made of resin, the rib pieces 2b can be made by integral molding. When the chassis 2 is made of metal, the rib pieces 2b can be cut and raised into the shape of the rib piece 2b. Can be integrally formed. Further, when the front panel 6 is made of resin, the projection 6a can be manufactured by integral molding. Therefore, a new member for forming the rib pieces 2b and the protrusions 6a is unnecessary.

In the above embodiment, the rib pieces 2b formed on the front edge 2a of the chassis 2 and the upright pieces 2c of the rib pieces 2b are formed.
In order to make 2c protrude toward the rear surface 10b of the display tube 10,
Although a pair of cut grooves 3c, 3c are formed in the printed wiring board 3, as shown in FIG. 3, the mounting section 3d of the display tube 10 is formed by projecting forward from the front edge 3a of the printed wiring board 3. In this case, it is not necessary to form the cut grooves 3c in the printed wiring board 3.

[0020]

According to the display tube mounting structure of the present invention, a printed circuit board is mounted on a chassis which is a bottom wall portion of a housing having an open front, and a display window is provided on an opening of the front of the housing. In a structure in which a formed front panel is attached and a display tube is attached to a front edge of a printed wiring board facing a display window of the front panel, the display tube has a connection terminal connected to a conductor of the printed wiring board. It is erected by directly connecting to the pattern, and the left and right sides on the rear side are held by a pair of rib pieces formed at a predetermined interval on the front edge of the chassis. Since the front side is configured to be held by the formed projections, the display tube can be fixed and the display can be performed without the display tube holder which is an independent member. Since the holder is not required, but can be reduced is that amount component cost.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a mounting structure of a display tube according to the present invention.

FIG. 2 is a perspective view showing a state in which a printed wiring board is attached to a chassis.

FIG. 3 is a perspective view showing another embodiment of the printed wiring board.

FIG. 4 is a perspective view showing an example of a conventional mounting structure of a display tube incorporated in an AV device.

FIG. 5 is a perspective view showing a shape of a conventional display tube holder.

FIG. 6 is a cross-sectional view showing a state in which an end of a display tube is fitted into a conventional display tube holder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Chassis 2b Rib piece 2c Standing piece 3 Printed wiring board 5 Front opening 6 Front panel 6a Projection 7 Display window 10 Display tube 10a Connection terminal 10b Rear 10c Front

Claims (1)

[Claims] 1. A printed circuit board is mounted on a chassis which is a bottom wall portion of a housing having a front opening, and a front panel having a display window is mounted on a front opening of the housing. In a structure in which a display tube is attached to a front edge of the printed wiring board facing a display window of a front panel, a connection terminal of the display tube is directly connected to a conductor pattern of the printed wiring board. Erected by
The left and right sides of the rear side are respectively held by a pair of rib pieces formed at a predetermined interval at the front edge of the chassis, and the front side is formed by a projection formed near the display window of the front panel. A display tube mounting structure characterized by being held.