JPH06176837A - Base for cathode-ray tube and socket for cathode-ray tube - Google Patents

Abstract

PURPOSE:To provide a base and a socket with which depth of a cathode-ray tube device. CONSTITUTION:A base 4 is composed of an insulation material base main body 5 and plural conductive material contact members 6, a front part of each contact member 6 is put to each throughhole 10 provided at a front surface part 8 of the base main body 5, a back part is disposed on a cylindrical surface part 9 of the base main body 5, and a pin 3 of a cathode-ray tube is split into split grooves 11 in each contact member. In the meanwhile, plural contacts 27 are provided in the socket on a circular track which is sufficiently larger than a diameter of a conventionally standardized pin track, and each pin 3 and each contact 27 are connected to each other in a radial direction of a tube shaft by each contact member 6 of the base.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube base fixed to a stem portion of a cathode ray tube with an adhesive, and a cathode ray tube socket connected to a plurality of pins provided on the stem portion of the cathode ray tube. Thickness (length from front to back of socket)
Is thin so that the depth of the cathode ray tube device can be shortened when viewed from the whole.

[0002]

2. Description of the Related Art A stem base (stem glass) that is conventionally fused to the rear end of a neck portion of a cathode ray tube has a resin base fixed to its rear surface with an adhesive and penetrates the stem portion. The fixed plurality of pins pass through the through holes formed in the base and project rearward. Conventionally, by forming a plurality of pins fixed to the stem part sufficiently long, electrical connection between these and the socket,
At the same time, the mechanical connection force holds the socket and the printed circuit board to which this socket is connected to the above-mentioned base.

[0003]

Conventionally, since the socket and the printed circuit board to which this socket is connected are held only by the mechanical connecting force (contact force) by only a plurality of pins, the length of the pin is increased. Is inevitably large,
The cathode ray tube device (device including a socket and a printed circuit board connected to the cathode ray tube device) is one of the factors that hinders the reduction in thickness of the entire device.

[0004]

In order to solve the above problems, in the cathode ray tube base according to claim 1, the base fixed to the rear surface of the stem portion of the cathode ray tube with an adhesive is a base body made of an insulating material. It is composed of a plurality of contact pieces made of conductive material, the front part of each contact piece corresponds to a plurality of through holes provided in the front part of the base body, and the rear part is arranged along the cylindrical surface part of the base body. However, the pin of the stem portion of the cathode ray tube is brought into contact with the electrical contact portion formed on the front portion of each contact piece.

Further, in the cathode ray tube socket of the second aspect, on a circular locus having a diameter larger than the diameter of the defined circular locus formed by the plurality of pins fixed to the stem portion of the cathode ray tube, A plurality of contacts for electrically and mechanically detachably connecting the plurality of pins fixed to the stem portion to the wiring of the printed circuit board are attached.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of a cathode ray tube base and a cathode ray tube socket according to the present invention will be described with reference to the drawings. As shown in FIG. 2, a stem portion 2 is fused to a rear end of a neck portion 1 of a cathode ray tube, and a plurality of (for example, 11) pins 3 are attached to the stem portion 2.
Although not shown, these pins 3 are on the same defined circular locus, and two of them are connected to the CV (Convergence Voltage) electrode and the focus electrode of the cathode ray tube and are different from other pins 3. Has a space. It should be noted that only one pin 3 is shown in FIG. 2, and in particular, reference numeral 3'is attached.

A base 4 is fixed to the rear surface of the stem portion 2 with a silicone resin adhesive. This base 4 is shown in FIG.
As shown in FIGS. 3A to 3C, the base main body 5 made of resin and a plurality of contact pieces 6 are formed. The base main body 5 is continuous from a cup-shaped main portion 7 and an edge of the main portion 7. Front part 8
And a cylindrical surface portion 9 continuous rearward from the outer peripheral edge of the front surface portion 8 are integrally formed, and through holes 10 are formed in the front surface portion 8 at positions corresponding to the pins 3 of the stem portion 2. There is.

Each contact piece 6 is formed of a metal material such as phosphor bronze into a substantially L shape, and the front portion thereof is arranged corresponding to the through hole 10.
The rear portion is arranged along the cylindrical surface portion 9 of the base body 5.
In the front part of each contact piece 6, a + -shaped (or -shaped) split groove 11 is previously formed at a position corresponding to the through hole 10,
It is an electrical contact portion with the pin 3. The contact piece 6 is so-called insert-molded on the base body 5.
This will be briefly described with reference to FIG. 3A. As shown by the alternate long and short dash line, each contact piece 6 is radially arranged, and these are connected in advance by two large and small concentric circle portions 6a and 6b surrounding the base body 5, After the insert is formed in the base body 5 in this state, a portion shown by a dotted line (only a part is shown) is cut, and a portion radially extended outward is bent along the cylindrical surface portion 9. .

2 located below in FIGS. 3A-3C
A piece of contact piece 6 (in particular shown in the drawing with the reference numerals 6'and 6 ") is connected to the pin 3'described above. The cylindrical surface portion 9 of the base 4 is provided with the contact piece 6 ', 6". A wall 12 is formed so as to sandwich it, and a semi-cylindrical convex bank 13 is formed between the other contact pieces 6. Both the wall 12 and the convex bank 13 are formed integrally with the tubular surface portion 9.

To attach such a base 4 to the rear surface of the neck portion 1, a plurality of pins 3 of the stem portion 2 are attached to the base 4.
4A, that is, by facing the split groove 11 of each contact piece 6 and strongly pressing it, each pin 3 spreads the split groove 11 of each contact piece 6 and inserts it. And can be electrically and mechanically connected to them. The stem portion 2 and the base 4 are fixed with a silicone resin adhesive (not shown). At this time, electrical insulation is maintained between the pins 3 by this adhesive. In the above example, the rear portion of each contact piece 6 is arranged along the cylindrical surface portion 9 of the base body 5, but as shown in FIG. 4B, this portion is further extended and folded back to give elasticity,
You may make it contact elastically with the contact of the socket mentioned later. In this case, the elastic means is unnecessary on the contact side.

FIGS. 5, 6A and 7A are a front view, a rear view and a sectional view showing the socket 20. The socket 20 is made of an insulating material such as resin and is used for the main part (socket body) 2
1 and a sub portion (socket cover) 22. The main portion 21 is roughly divided into an upper portion 21A and a lower portion 21B (see FIG. 8). The upper portion 21A has a substantially half-ring shape with the point O as the center, and a hollow portion 23 is formed in the center. The upper portion 21A is provided with a plurality of contact insertion portions 26 extending from the inner peripheral surface 21a to the rear surface thereof. Each contact 27 is inserted and fixed.

The lower portion 21B is substantially vessel-shaped, and its open portion (open surface) faces the front. The upper portion 21A and the lower portion 21B have their respective back portions continuous and integrated with each other. In this example, as shown in FIG. 8, the upper edge of the lower portion 21B is extended upward in a reverse fan shape to form a wall 24, and a cylindrical body 25 having a point O as its center is provided at the top thereof. As will be described later, the base 4 fixed to the above-described cathode ray tube is just fitted in the cavity 23 of the upper portion 21A of the main portion 21.

As is apparent from FIG. 7B, the contact 27 has a fixing portion 27a for the insertion portion 26 and a contact portion 2 formed by bending the front portion thereof into an elliptical shape.
7b, a back contact portion 27c of the main portion 21 formed by bending the rear portion of the fixing portion 27a at a right angle, and a terminal portion 27d further bent at a right angle and protruding rearward. , A long strip-shaped metal plate is bent, and the width of the fixing portion 27a is formed to be slightly larger than the width of the other portion. This is the insertion portion 26 shown in FIG. 6B.
The contact 27 is fixed in the insertion portion 26 by being press-fitted into the grooves 26a and 26b formed in the left and right walls of the contact. At this time, the contact portion 27b of each contact 27
The circular locus of is selected to be sufficiently larger than the conventional circular locus of the pin. Further, as shown in FIG. 7B, a claw 27e is provided on a part of the fixed portion 27a to prevent the contact 27 from coming off.

As shown in FIGS. 5 to 7, before the socket 20 is used, the contact portion 27b of the contact 27 largely protrudes from the insertion portion 26 toward the central portion (point O). When the base 4 is fitted in the cavity 23 of the upper portion 21A of 21, that is, when the socket 20 is electrically and mechanically connected to the pin 3, these contacts 27 are included in the contact piece 6 of the base 4 described above. , The contact pieces 6 ′, 6 ″, other than the contact pieces 6 ′, 6 ″.
Nine contacts 27 are attached to 1A in this example.

A groove 28 is provided along the front surface of the upper portion 21A of the main portion 21 (therefore, the groove 28 has a semi-ring shape), and an earth ring 29 shown in FIG. 10 is fitted therein. In this earth ring 29, a strip-shaped metal piece is a groove 28.
Is formed to be curved in a semi-circular shape so as to correspond to, and projecting pieces 29a protruding forward are provided at a plurality of positions on one edge (front edge) of the projecting piece 29a and are bent inwardly, respectively, and their tips are provided. Abut on the inner surface of the opening portion of the groove 28. The formation position of the protruding piece 29a corresponds to each contact 27.

Each contact 27 of this earth ring 29
As shown in FIG. 7B, the bulging portion 2
9b is formed, and a discharge gap 30 is formed between each bulged portion 29b and each contact 27. A terminal portion 29c is provided on one end side of the earth ring 29, and the terminal portion 29c is penetrated through a through hole 31 formed in a part of the main portion 21 to project to the rear of the main portion 21.

FIG. 9 shows the front surface of the sub portion 22 of the socket 20. The sub-part 22 has a container-like shape, and the main part 2 described above is used.
It is formed to fit exactly within the lower portion 21B of unit 1. Therefore, the lower part 21B of the main part 21 and the sub part 22 form a box. The upper surface 22a of the sub portion 22 is formed in an arcuate surface centered on the point O along the ring-shaped curved surface of the upper portion 21A of the main portion 21, and the enclosures 32 are formed on the upper surface 22a at substantially symmetrical positions. ing. This enclosure 32 is composed of three walls, a front wall 32a, a left wall 32b, and a right wall 32c, and there is no rear wall, and the upper part is open.

A contact portion 27b of the contact 27 (particularly denoted by reference numerals 27 'and 27 "in the figure) is housed in the enclosure 32, and a lead portion 27e extended from the contact portion 27b is a main portion. 21 and the sub-portion 22 are introduced into the sub-portion 22 through the abutting portion of the sub-portion 22 and the sub-portion 22. The contact portions 27b of the contacts 27 'and 27 "have the same structure as that of the contact 27 described above, and the base 4 Before being fitted, they extend inwardly beyond the enclosure 32 and are arranged on the same circular locus as those of the contacts 27 attached to the main portion 21 described above. When the base 4 is fitted to these contact portions 27b, as described later, the contact pieces 6 ',
6'are in contact with each other. 27 'is a CV contact connected to the above-mentioned CV electrode of the cathode ray tube, and 27' is a focus contact connected to the focus electrode.

The end portion of the lead portion 27e of the contact 27 'is connected to a connection fitting, and the lead portion 2 of the contact 27 "is connected.
The end of 7e is connected to another connection fitting through a resistor 33 housed in the sub portion 22. Both of these connecting fittings are housed in the sub-part 22, but the structure thereof is not directly related to the gist of the present invention, and therefore detailed description and illustration thereof are omitted. However, when these lead wires (not shown) are respectively inserted through the through holes 34 and 35 provided in the front surface of the sub portion 22, these lead wires are automatically captured and electrically connected. And mechanically fixed at the same time. The end portion of the resistor 33 connected to the other connecting fitting is further connected to one electrode 36a of the discharge gap 36 housed in the sub portion 22,
A part of the other electrode 36b serves as a terminal portion 36c and is used as the main portion 21.
It is projected rearward through the hole 37 (see FIG. 1).

The sub portion 22 described above is the lower portion 21B of the main portion 21.
7A and 7B, the two are combined as shown in FIG. 7A to form the socket 20. This socket 20 is used by being attached to a printed circuit board 38 (see FIG. 7A) arranged on the back side thereof. At this time, each contact 27 ',
The terminal portion 27d of each contact 27 except 27 ″, the terminal portion 29c of the earth ring 29, the terminal portion 3 of the discharge electrode 36b.
6c is each land of the printed circuit board 38 (terminals 29c,
36c is connected to a ground land).

While the base 4 of the cathode ray tube is being inserted into the hollow portion 23 of the socket 20, the respective contact 27 are resisted by their outer peripheral edges by the outer peripheral edge of the base 4 and the respective contact insertion portions 26 and the enclosure 32. The contact portions 27b of the respective contacts 27 are brought into contact with the corresponding contact pieces 6 (contact pieces 6'and 6 "come into contact with the contacts 27 'and 27").
A signal is supplied to each cathode 27 from each land of the printed circuit board 38 through each contact 27 and the corresponding contact piece 6. A particularly high voltage is required for the CV electrode and the focus electrode of the cathode ray tube, and the contacts 27 ', 2
Since a high voltage is applied to 7 ″, the wall 12 of the base 4 and the enclosure 32 form an electrical barrier against other contacts 27 to enhance the creeping effect. Also, the connection state between the base 4 and the socket 20. In this case, the pins 3 and the contacts 27 are connected to each other by the contact pieces 6 of the base 4 in the radial direction of the tube axis of the cathode ray tube, so that the connecting means by the socket does not project backward long like the conventional case.

A semi-cylindrical portion 39 is formed on the outer peripheral surface of the upper portion 21A of the main portion 21 of the socket 20 so as to project forward integrally therewith, and a semi-cylindrical portion 40 is also formed on the front surface of the sub portion 22 correspondingly. The semi-cylindrical portion 39 has a size of about 3/4 of the circumference, and the semi-cylindrical portion 40 has a size of about 1/4 of the circumference. A cylindrical portion is formed in which is just fitted. Semi-cylindrical part 39
Is provided with split grooves 41 extending in the front-rear direction at a plurality of positions, and each of the partial pieces divided by the split grooves 41 has flexibility. A tightening ring 42 is arranged on the outer peripheral surface of the cylindrical portion composed of the semi-cylindrical portions 39 and 40.

The front and rear views of the tightening ring 42 are the same, as shown in FIG. 11A.
As is clear from this, the outer peripheral portion 43 has a substantially octagonal ring shape, and the edge portions 44a and 44b protruding inward from both edges thereof are integrally formed of a resin material. . The inner peripheral edges of the edge portions 44a and 44b are on a circular locus having substantially the same size as the cylindrical portion composed of the semi-cylindrical portions 39 and 40 described above, and three portions are cut off to form a cutout portion 4
6a and 46b are formed, and slope portions 45a and 45b are formed on part of the edge portions 44a and 44b.

On the other hand, in the semi-cylindrical portion 39 of the main portion 21, jetty walls 47 are formed at a plurality of locations near the tip portion (see FIG. 6A), and these are fitted between the edge portions 44a and 44b to position the tightening ring 42. Further, the semi-cylindrical portion 39 is further provided with sloped portions 45a, 45a of the tightening ring 42.
A protrusion 48 having a slope is formed corresponding to b.
When the tightening ring 42 is rotated (slightly angled), the inclined surface portion 45a or 45b thereof is mounted on the upper surface of the protrusion 48 to reduce the diameter formed by the semi-cylindrical portions 39, 40, and the neck portion 1 of the cathode ray tube is reduced. I try to tighten it. This causes the socket 20 to be mechanically retained at the rear end of the cathode ray tube.

[0025]

According to the cathode ray tube base according to the present invention, since the plurality of contact pieces are electrically connected to the plurality of pins of the stem portion, respectively, it is possible to make sufficient contact between them and Even if the length of the pin of the portion is shortened, there is an effect that the electrical connection between the contact piece and the pin can be ensured. Further, the base is mechanically coupled to the stem portion by means of a socket as well as being adhered, so that there is an effect that the mounting strength of the base is increased. Further, since the contact piece and the pin of the stem portion are connected by pressure contact by pressing the base against the rear end of the stem portion, there is an effect that no particular labor is required for these connections.

Further, according to the cathode ray tube socket of the present invention, since the contacts of the socket are arranged in substantially the same plane as the arrangement (arrangement) of the pins of the stem portion, the printed circuit board is provided on the rear surface of the base. Since the cathode ray tube device including the socket and the printed circuit board connected to the socket can be sufficiently reduced in depth as compared with the conventional socket, the size can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a state in use showing an example of a cathode ray tube base and a cathode ray tube socket according to the present invention.

FIG. 2 is a cross-sectional view showing a state in which a base is fixed to a stem portion of a cathode ray tube.

FIG. 3A is a front view showing an example of a cathode ray tube base according to the present invention, B is a rear view thereof, and C is a sectional view taken along line AA of A.

FIG. 4A is a partially enlarged cross-sectional view of FIG. 3C, and B is a partially enlarged cross-sectional view of another embodiment.

FIG. 5 is a front view showing an example of a cathode ray tube socket according to the present invention.

6A is a rear view of the cathode ray tube socket shown in FIG. 5, and FIG. 6B is a partial view showing a state in which the contacts are removed in FIG. 6A.

7 is a side view showing a cross section taken along the line BB of FIG. 5, and B is an enlarged sectional view in which a part thereof is enlarged.

FIG. 8 is a front view of the main part of the socket according to the present invention.

FIG. 9 is a front view of a sub portion of the socket according to the present invention.

FIG. 10 is a front view showing an example of an earth ring that can be used for this socket.

FIG. 11A is a front view showing an example of a tightening ring that can be used in this socket, and B is a sectional view thereof.

Claims (2)

[Claims] 1. A cathode ray tube having a front surface portion fixed to the rear surface of the stem portion with an adhesive, and a tubular surface portion in a direction along the axis of the cathode ray tube. A base body made of an insulating material, each of which has a through hole corresponding to a plurality of pins, and an insert formed in the base body. A front portion is arranged corresponding to the through hole, and a rear portion is the cylindrical shape. A base for a cathode ray tube, comprising: a plurality of contact pieces, which are bent and arranged along the surface portion, and each of which has a plurality of contact pieces formed in the front portion to electrically contact with a pin of the stem portion. 2. The plurality of pins are arranged on a printed circuit board on a circular locus having a diameter larger than a diameter of a defined circular locus formed by the plurality of pins fixed to the stem portion of the cathode ray tube. A cathode ray tube socket to which a plurality of contacts for electrically and mechanically detachably connecting is attached.