JP2001217055A - Socket for double-focus crt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double-focus CRT socket composed of less parts and improved in assembly. SOLUTION: A pair of focus contacts (70) of the same shape are formed having a high-voltage contact (71) at one end of a coupling plate (73) and a coupling connector (72) of a leaf spring at the other end. Making a discharge electrode (15A) contact the coupling connection part (72), one focus contact (70) is made a first focus contact (7A), and the other is made a second focus contact (7B), making a second exterior lead wire (30) contact the coupling connector (72). Thus, the one focus contact (70) can be used both for the first and the second focus contacts (7A), (7B).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD OF THE INVENTION

[0002] The present invention relates to a CRT (Cathode-Ray) for connecting a cathode ray tube used for a color television or the like.
-Tube) Regarding the structure of the socket, in particular, it relates to a double focus type CRT socket connected to a cathode ray tube in which two focus pins are arranged.

[0003]

2. Description of the Related Art A conventional double focus type CRT socket has a set of focus contacts which respectively contact and electrically connect two focus pins of a cathode ray tube.
A focus voltage is applied to one set of focus contacts from two external lead wires connected to a flyback transformer, but is unnecessary due to a high-frequency signal applied from a focus pin to a cathode of a cathode ray tube. The radiation signal may enter the focus circuit block and affect the focus of the electron beam.In order to reduce this effect, one focus contact is connected to an external lead via a resistor element connected in series. I have.

In order to prevent the spark energy from flowing back from the focus contact when an abnormal discharge occurs in the cathode ray tube, the above-mentioned one focus contact is opposed to the ground-side discharge electrode plate via a discharge gap. The focus side discharge electrode plate is electrically connected.

The structure of the conventional double focus type CRT socket 101 will be described in more detail with reference to FIGS.
9 is a plan view of the CRT socket 101, FIG. 10 is a rear view of a main part excluding a bottom cover 102c, and FIG. 11 is a perspective view of a main part showing a connection structure of a pair of focus contacts 105A and 105B.

As shown in these figures, a CRT socket 101 is composed of a cylindrical housing 102a having a cylindrical base insertion hole 116 formed therein, and a rectangular box shape integrally formed at the rear (upper in FIG. 9). Housing 102b
And an insulating housing 102 formed of a bottom lid 102c that engages with the back (bottom) side of the square housing 102b and covers the back.

The components of the CRT socket 101, which will be described later, include a cylindrical housing 102a and a square housing 10a.
2b is attached and accommodated from the back side, and then the bottom cover 1
02c is engaged with the square housing 102b to cover the mounting surface.

The cathode ray tube is connected to the surface (flat surface) of the cylindrical housing 102a. As shown in FIG.
The signal contact portions 104a of the plurality of signal contacts 104 and the high-voltage contact portions 105a, 105a of the pair of focus contacts 105A, 105B are formed into a cylindrical housing 102a so as to make a mating contact with each pin of the cathode ray tube neck.
On one plane, which is concentric with the base insertion hole 116.

[0009] Focus contacts 105A, 105B
Is applied with a particularly high voltage as compared with the signal contacts 104, so that the connecting plates 105b, 105b connected to the high voltage contacts 105a, 105a are It is drawn out into the lower box-shaped housing 102b.

[0010] As shown in FIG. 10, a pair of focus contacts 105A and 105B are connected to a high-voltage contact portion 105a.
105a is pulled out parallel to each other in the direction of the box-shaped housing 102b.
The connection plate 105b of 5A is bent in a crank shape so that the resistance element 115 is accommodated on the side, and the focus-side discharge electrode plate 107 and the resistance element 115 are connected to the ends thereof.

Also, the other focus contact 105
B connecting plate 105b is also a focus contact 105A.
In order to secure an insulation distance from the housing, a second external lead wire 114 which is similarly bent in a crank shape and is inserted from the flat side of the box-shaped housing 102b is connected to the end.

A pair of focus contacts 105A, 1
The connection structure 05B will be described in more detail with reference to FIG. 11. One focus contact 105A is formed by bending an end of a connecting plate 105b in a U-shape with a downward cross section and two parallel pressure contact slits in the bent portion. 106, 106 are recessed. Among them, the press-contact slit 106 on the right side in the drawing is a connection connection portion 105c for press-fitting the connection piece 107a of the focus-side discharge electrode plate 107 formed so that the center protrudes in a spherical shape.
Are electrically connected to the focus-side discharge electrode plate 107.

The focus-side discharge electrode plate 107 is disposed opposite to a similarly formed ground-side discharge electrode plate 109 with a discharge gap therebetween in a discharge space 108 formed in the box-shaped housing 102b. When an abnormal voltage is applied to the focus contact 105A, the focus contact 105A is discharged to the ground-side discharge electrode plate 109 (see FIG. 10).

The pressure contact slit 106 on the left side in FIG. 11 press-fits the inner lead portion 115a of the resistance element 115, and press-connects one side of the resistance element 115 to the focus contact 105A.

Outer lead portion 115b of resistance element 115
Is connected to the pressure contact slit 112a of the terminal 112 by pressure contact. The terminal 112 also has a first external lead wire 11 inserted from the flat side of the square housing 102b.
The first external lead wire 113 is integrally provided with a connection spring piece 112b elastically contacting the first external lead 3 and connecting to a flyback transformer.
And make an electrical connection.

Accordingly, one of the focus contacts 105A has no soldering step, and one of the focus pins of the cathode ray tube is electrically connected to the first external lead wire 113 via the focus side discharge electrode plate 107 and the resistor element 115. Can connect.

Also, the other focus contact 105
In B, the end of the connection plate 105b is a connection connection portion 105c provided with a connection spring piece 117, and makes elastic contact with the second external lead wire 114 connected to the flyback transformer.

With this configuration, the focus contact 1
05B electrically connects the other of the focus pins to the second external lead wire 114.

[0019]

As described above, the connection connecting portion 105c of one focus contact 105A is
The connecting slit 105c of the other focus contact 105B makes elastic contact with the second external lead wire 114 by means of a connecting spring piece 117. The connection plate 10 of the focus contact 105A
The resistor 5b is bent into a crank shape avoiding the resistor 115 because the resistor 115 is accommodated on the side.

For this reason, the pair of focus contacts 105A and 105B must be manufactured as separate parts having different shapes, and the number of parts increases.
Parts management also had to be performed individually.

Further, since both have similar shapes having a high-pressure contact portion, the focus contacts 105A, 10A
5B may be erroneously mounted in the reverse direction, which is likely to cause a failure, and it is necessary to carefully mount the 5B on the insulating housing 102, resulting in poor workability.

Since the focus pin has the same shape, the high-pressure contact portion 105a can be manufactured and used in common because the focus pin has the same shape. It was not possible to share the entire focus contact.

The inner lead 11 of the resistance element 115
5a is press-fitted and connected to the pressure contact slit 106 adjacent and parallel to the connection connection portion 105c, so that the solder connection step is eliminated, but the pressure connection state of one pressure contact slit 106 affects the other, and for example, the inner lead portion If 115a is smaller than the design value, there is a problem that the press-contact of the focus-side discharge electrode plate 107 to the connection piece 107a is loosened and a reliable connection cannot be maintained.

Further, two parallel pressure contact slits 106 and 106 are formed in the focus contact 105A, and a large connection space is formed on the plane of the insulating housing 102 to connect the discharge electrode plate 107 and the resistance element 115 thereto. This is an obstacle to downsizing the CRT socket 101.

The present invention has been made in order to solve the above-mentioned problems. A double focus contact is used for one type of focus contact, reducing the number of parts and improving the workability of assembly. An object of the present invention is to provide a focus type CRT socket.

It is another object of the present invention to provide a double focus type CRT socket in which a resistance element is securely connected to a focus contact without a solder connection step and does not take up a large connection space on a plane.

[0027]

In order to solve the above problems, a double focus type CRT socket according to claim 1 is mounted on an insulating housing into which a cathode ray tube is fitted and connected, and two focus pins of the cathode ray tube. One of the two focus pins is insulated from the discharge electrode plate, the first focus contact electrically connected to the first external lead wire, and the first focus contact, and is attached to the insulating housing. Double focus type CRT having a second focus contact electrically connected to a lead wire
In the socket, a connection plate obtained by bending an elongated strip-shaped conductive metal plate in a substantially U-shape along the longitudinal direction, and a high-pressure contact portion that is continuous with one end of the connection plate and contacts the focus pin,
A first pin contact chamber into which one focus pin is inserted into the insulating housing, wherein a pair of focus contacts having the same shape having a connection connection portion formed by bending the other end of the connection plate into a leaf spring piece is further formed; The connection connection chamber facing a part of the discharge electrode plate, the second pin contact chamber into which the other focus pin is inserted, and the lead connection chamber into which the second external lead wire is inserted are recessed, and one focus is formed. The high-voltage contact portion and the connection connection portion of the contact are accommodated in the first pin contact chamber and the connection connection chamber, respectively, and are brought into contact with one focus pin and the discharge electrode plate, and the first external lead wire is electrically connected to the connection plate. The high-voltage contact portion and the connection portion of the other focus contact are respectively referred to as a second focus contact.
It is housed in the pin contact chamber and the lead connection chamber, and is brought into contact with the other focus pin and the second external lead wire to form a second focus contact.

The connecting connection portion of the focus contact is a leaf spring piece and is housed in the connecting connection chamber or the lead connection chamber, and has a structure in which it comes into contact with both the discharge electrode plate and the second external lead wire. One set of focus contacts can be shared by both the first focus contact and the second focus contact.

Therefore, it is not necessary to separately manufacture two types of focus contacts, and parts management becomes easy. In addition, when attaching the focus contact to the insulating housing, it is not necessary to consider the attachment position of the first focus contact and the second focus contact, and no failure occurs due to erroneous attachment.

In the double focus type CRT socket according to the second aspect, a pressure contact slit is formed in a bent portion of the connection plate along a longitudinal direction of the connection plate, and a resistance connected in series with the first external lead wire. It is characterized in that one side lead of the element is press-connected.

Since the one side lead portion of the resistance element is pressure-connected to the pressure-contact slit formed in the connection plate, the resistance element connected in series with the first external lead wire can be connected without a solder connection step. it can. Since the pressure contact slit is formed in the bent portion of the connecting plate along the longitudinal direction, the pressure contact slit is also formed over an orthogonal L-shape, and the one-side lead portion is easily press-fitted into one of the perpendicular pressure contact slits. Can be.

In the first focus contact, since the connection connection portion at the other end of the connection plate is a leaf spring piece and the bent portion is a pressure contact slit, the connection state to the connection connection portion affects the connection of the pressure contact slit. And the pressure connection is reliably maintained. In addition, if the focus contact is attached to the insulating housing so that both ends of the connection plate bent in a substantially U-shape are in the vertical direction, the connection connection portion and the press-contact slit are formed substantially overlapping in the vertical direction, and discharge is performed. The electrode plate and the resistive element can be connected without increasing a horizontal connection space.

According to a third aspect of the present invention, there is provided a double focus type CRT socket, wherein a base insertion hole through which a base of a cathode ray tube is inserted is formed in an insulating housing, and a first pin contact chamber and a connection connection chamber, and a second pin contact chamber and a lead are provided. The connection chamber is radially recessed from the center of the base insertion hole.

Since the connecting plates of the first focus contact and the second focus contact are radially arranged from the center of the base insertion hole, the space between the connecting connection portions or between the discharge electrode plate and the second lead wire naturally. Because they are separated and the creepage distance is long, short-circuiting is difficult.

A double focus type CRT socket according to a fourth aspect is characterized in that a leaf spring piece obtained by further bending one end of a connecting plate is used as a high-pressure contact portion.

Since the high-pressure contact portion that comes into contact with the focus pin is formed by a leaf spring piece, it can be formed by a simple process without using any material.

[0037]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A double focus type CRT socket 1 according to an embodiment of the present invention will now be described with reference to FIGS.
This will be described below. FIG. 1 is a perspective view of a CRT socket 1,
2A and 2B show the insulating housing 2, wherein FIG. 2A is a plan view of the socket body 3, and FIG. 2B is a plan view of the cover 5. FIG. 3 is a cutaway view of a part of the socket body 3.
FIG. 4 is an exploded perspective view of a cover portion 5 to which a pair of focus contacts 7A and 7B are attached, FIG. 5A is a front view of a focus contact 70, and FIG. FIG. 6C is the bottom view of FIG.
Is a perspective view showing a connection state in the cover 5, and FIG.
Cover part 5 that has been longitudinally cut along the focus contact 7A
FIG. 8 is a partially cutaway side view of the CRT socket 1.

Double focus type C according to the present embodiment
The RT socket 1 has a plurality of signal contacts 6, 6,... And a pair of focus contacts 7A, 7B attached to an insulating housing 2 formed by injection molding of a synthetic resin.

The insulating housing 2 is, as shown in FIG.
A socket body 3 having a base insertion hole 8 formed in the center of the front (right side in the figure) and a cover part 5 whose back side is covered by a base 3a behind the socket body 3 are combined. It is formed by injection molding a resin.

The base insertion hole 8 is formed in a cylindrical shape having an inner diameter slightly larger than the outer diameter of the base so that the base of the cathode ray tube can be inserted from the surface side of the ring-shaped portion 3. In the socket body 3, signal contact accommodating chambers 9 are recessed from the back side at nine positions on the same circumference outside the base insertion holes 8 from the rear side (see FIG. 7). The upper part communicates with the front side.

As shown in FIG. 7, the signal contact 6 attached to the signal contact accommodating chamber 9 from the rear side is formed by bending a long and narrow strip-shaped conductive metal plate. It has a leaf-shaped signal contact portion 6a folded in a dogleg shape, and a lead-out portion 6b connected to the pattern of the printed wiring board 120 at the other end of the crank shape by soldering.

When each signal contact 6 is mounted in the signal contact accommodating chamber 9, the signal contact portion 6a faces the surface of the socket body 3 via the pin insertion hole 10 on the same circumference and is arranged on the circumference. The signal pins of the cathode ray tube. That is, each signal pin of the cathode ray tube is guided into the signal contact accommodating chamber 9 by the pin insertion hole 10 formed in the corresponding portion, and elastically contacts the signal contact portion 6a.

The base 3a at the rear of the socket body 3 has a cover 5 as is apparent from a comparison between FIGS.
The outline of the plane is shaped to fit the cover portion 5 from the outside so as to cover the entire back side of the device, and it has a square shape in which the partition 13 is erected along the outline.

In front of the base 3a, three slits 1 are provided.
2, 12, 12 define a pair of fan-shaped recesses 4, 4 centering on the base insertion hole 8. Fan-shaped recesses 4, 4
Is located on the same circumference as the front ring-shaped portion of the socket body 3 and covers the periphery of the sector-shaped recesses 4, 4.
3 a constitutes a part of the inner wall of the base insertion hole 8.

As shown in FIG. 7, on both sides of the base 3a, engaging frame portions which engage with the engaging projections 5a of the cover portion 5 while covering the back side of the cover portion 5 to be integrated. 3b is erected. An insulating protrusion 14 that protrudes into the cover 5 when integrated with the cover 5 and prevents discharge between conductive parts such as focus contacts 7A and 7B housed in the cover 5 is surrounded by a partition wall 13. Formed on the inside.

As shown in FIG. 4, the cover 5 accommodates a pair of discharge electrode plates 15A and 15B, a resistance element 16, and a terminal 17 in addition to the pair of focus contacts 7A and 7B.

Therefore, the cover section 5 includes a first pin contact chamber 18A and a second pin contact chamber 18B for accommodating the high-pressure contact sections 71 of the pair of focus contacts 7A and 7B.
The connection connection chamber 26 that connects the focus-side discharge electrode plate 15A to the connection connection portion 72 of the focus contact 7A, and the discharge chamber 19 in which the pair of discharge electrode plates 15A and 15B face each other.
A lead connection chamber 20 for connecting the second external lead wire 30 to the connection connection portion 72 of the second focus contact 7B;
Terminal accommodation chambers 32 for connecting the first external lead wires 31 to the terminals 17 are respectively erected from the inner top surface of the cover part 5 (in FIG. 4, they are erected from the inner bottom surface).
The insulating projection wall 21 is formed as a concave portion that opens to the rear side.

Each chamber is separated by an insulating projection 21.
When the cover portion 5 is engaged with the base portion 3a of the socket body 3, the portion where the insulating protruding wall 21 is missing is covered by the insulating protrusion 14 of the cover portion 5, and the spaces between the chambers are more reliably insulated. .

The focus contacts 70 serving as a pair of focus contacts 7A and 7B are formed by bending an elongated strip-shaped conductive metal plate, and as shown in FIG. High pressure contact portions 71 at both ends of 73
And the connection connector 72 are integrally formed.

The high-pressure contact portion 71 is connected to one end on the front side of the connecting plate 73. The support portion 71a which stands upright and the upper end of the support portion 71a are bent at an acute angle and formed on the free end side. And a spring contact portion 71b. The leaf spring contact portion 71b is bent forward at the middle, and is formed in a leaf shape with a U-shaped cross section.

The connecting portion 72 is connected to the other end on the rear side of the connecting plate 73, and is formed by bending the upper end of the connecting plate 73 bent upward at an acute angle rearward. Consists of a contact piece.

On both sides of the leaf spring contact piece 72, the leaf spring contact piece 7
A protection wing piece 72a orthogonal to 2 is integrally formed to prevent the leaf spring contact piece 72 from being excessively deformed and plastically deformed.

As shown in FIG. 4, a press-contact slit 28 is formed along the longitudinal direction of the bent portion which is bent at a right angle from the center to the rear of the connecting plate 73. The press-contact slit 28 is for press-connecting the inner lead 16 a of the resistance element 16 to the focus contact 70. The groove width of the press contact slit 28 is formed to be slightly smaller than the outer diameter of the inner lead portion 16a, and is parallel to the center connecting plate 73.
By press-fitting “a” in the direction of the connecting connection portion 72 (vertical direction from the back side), it is possible to easily press-connect to the press-contact slit 28.

In the present embodiment, a pair of focus contacts 70 having the same shape formed as described above is prepared, and one of them is accommodated in the first pin contact chamber 18A and the connection connection chamber 26, and the first focus contact 7A, and the other is accommodated in the second pin contact chamber 18B and the lead connection chamber 20 to form the second focus contact 7B.

The portion of the cover portion 5 fitted inside the fan-shaped recesses 4 of the base portion 3a is a pair of projections 22 formed in a fan shape, and is a first and a second. The two pin contact chambers 18A, 18B are respectively recessed in the pair of protrusions 22, 22. Above the pin contact chambers 18A and 18B, the focus pin insertion hole 23 into which the focus pin 50 is inserted communicates with the front side of the cover 5 (see FIG. 1). The focus pin insertion holes 23, 23 are formed at positions on the same circumference as the pin insertion holes 10 for exposing the signal contacts 6 to the front side when the base portion 3a and the cover portion 5 are engaged and assembled. The focus pins 50A and 50B of the cathode ray tube are guided into the first and second pin contact chambers 18A and 18B, respectively.

First and second pin contact chambers 18A, 18B
Are formed in the same shape to accommodate the high-pressure contact portion 71 of the focus contact 70. The high-voltage contact portion 71 of the focus contact 70 has the locking claws on both sides of the support portion 71a locked in the positioning grooves 18c (see FIG. 4) formed in the inner surfaces of the pin contact chambers 18A and 18B. It is positioned and accommodated in 18A and 18B. In this housed state, the support portion 71a holds the pin contact chambers 18A, 18A.
B, the plate spring contact portion 71 b stands up along the rear surface facing the base insertion hole 8, that is, the support portion 71.
A cantilever spring facing the lower part of the focus pin insertion hole 23 with the upper side of a being a fixed end.

As shown in FIG. 3, the connection connection chamber 26 is recessed substantially on a straight line connecting the center of the base insertion hole 8 and the first pin contact chamber 18A. The connection connection chamber 26 accommodates the connection connection portion 72 of the focus contact 70 serving as the first focus contact 7A, and the focus side discharge electrode is provided in the connection connection chamber 26 so as to make contact with the first focus contact 7A. The connecting plate portion 15a of the plate 15A is crosswise exposed. Therefore, as shown in FIG. 7, when the connection connecting portion 72 serving as a leaf spring contact piece is housed, the tip of the leaf spring contact piece elastically contacts the connection plate portion 15a.

On the other hand, a lead connection chamber 20 for accommodating a connection connection portion 72 serving as a second focus contact 7B is formed on a substantially extended line of a straight line connecting the center of the base insertion hole 8 and the second pin contact chamber 18B. I have. The lead connection chamber 20
The connecting portion 72 of the leaf spring contact piece is formed so as to be positioned and accommodated therein, and the tip end of the leaf spring contact piece contacts the inner wall surface. The upper part of the lead connection chamber 20 communicates with the front side of the cover part 5 through a keyhole-shaped lead insertion hole 20a, so that the second external lead wire 30 can be inserted into the lead connection chamber 20.

The connection of the second external lead wire 30 is performed by pressing a jig to be inserted into the lead insertion hole 20 a against the inclined surface of the leaf spring contact piece and bending the leaf spring contact piece 72 into the lead connection chamber 20. The second external lead wire 30 is inserted between the wall and the wall, and the jig is pulled out. As a result, the second external lead wire 30 is sandwiched between the leaf spring contact piece 72 and the inner wall surface, and makes elastic contact with the connection connection portion 72 serving as the second focus contact 7B.

As described above, the first pin contact chamber 18A and the connection connection chamber 26 or the second pin contact chamber 18B and the lead connection chamber 20 are formed radially with the base insertion hole 8 as a center, and are accommodated therein. The pair of focus contacts 7A and 7B are attached to the cover 5 radially around the base insertion hole 8. Therefore, between the connection connecting portions 72 of the focus contacts 7A and 7B, or between the focus side discharge electrode plate 15A connected thereto and the second
The edge surface distances between the external lead wires 30 are naturally separated from each other, and can be more reliably insulated from each other.

The pair of discharge electrode plates 15A and 15B are formed by pressing a conductive metal plate to form a hemispherical discharge portion 15b at the center of a rectangular plate. On the side of the rectangular plate of one focus side discharge electrode plate 15A, the above-described connection plate portion 15a is integrally formed in an L-shape. Further, a leg 15c is vertically provided integrally with the other ground-side discharge electrode plate 15B from a rectangular plate.

As shown in FIGS. 3 and 4, these discharge electrode plates 15A and 15B are attached to the insulating projection wall 21 around the discharge chamber 19 so that the discharge portions 15b and 15b face each other in the discharge chamber 19. Along with the cover 5. In the attached state, the connection plate portion 15a of the focus side discharge electrode plate 15A traverses the connection connection chamber 26 and makes elastic contact with the connection connection portion 72 of the focus contact 7A, and the leg portion of the ground side discharge electrode plate 15B. Reference numeral 15c penetrates the base portion 3a and is connected to the ground pattern of the printed wiring board 120 by soldering.

As described above, the focus side discharge electrode plate 15
A, the focus contact 7A is connected to the ground-side discharge electrode plate 1
By connecting a ground pattern to the discharge portion 5B and facing the discharge portions 15b with a discharge gap therebetween, when spark energy generated in the cathode ray tube is applied to the focus contact 7A, discharge occurs between the discharge portions 15b and 15b. And flow to the ground pattern.

A terminal accommodating chamber 32 penetrating through the front and back of the cover portion 5 is formed on an extension of the focus contacts 7A arranged radially. The terminal accommodating chamber 32 includes the first external lead wire 31 and the resistance element 16.
As shown in FIG. 7, a first external lead wire 31 inserted from the front side is guided to the terminal 17 with a narrowed inner diameter as shown in FIG.

As shown in FIGS. 6 and 7, the terminal 17 is formed by bending a conductive strip-shaped metal plate.
A lead connection piece 17a formed by folding back at an acute angle is provided on the front side, and a press connection section 17b having a press contact slit formed at the folded center is provided on the rear side.

The terminal 17 is positioned and fixed in the lead connection chamber 27 by locking a locking claw protruding from the side surface of the terminal 17 to the inner side surface of the lead connection chamber 27. As shown in FIG. The piece 17a is a narrowed lead connection chamber 27.
, And electrically connects to the first external lead wire 31 inserted from the front side.

Further, the outer lead portion 16b of the resistance element 16 is press-fitted into the press-connecting connection portion 17b on the back side and press-connected. As shown in FIG. 3, the press-connecting portion 17 b of the terminal 17 and the press-contact slit 28 of the focus contact 7 </ b> A
The resistive element 16 is on an extension of the radially attached focus contact 7A, and is connected to the leads 16a, 16a.
b can be press-fitted from the back side without bending, and can be connected between the terminal 17 and the focus contact 7A. As a result, the first focus contact 7A is connected to the resistance element 1
6 and a terminal 17 for electrical connection to a first external lead.

When assembling the double focus type CRT socket 1, components such as signal contacts 6, 6,... Similarly, the cover part 5 is attached with the above-mentioned components and the like from above with the back side opening surface facing upward. Next, the cover 5 accommodating each component is mounted on the partition wall 1 of the base 3a.
The socket 3 is placed on the front side of the socket body 3 so as to be fitted in the socket body 3, and the engagement projection 5 a of the cover 5 is engaged with the engagement frame 3 b of the socket body 3 to integrate the insulating housing 2.

As shown in FIG. 8, the integrated CRT socket 1 is mounted on a printed wiring board 120, and the signal contacts 6, 6,...
5c is soldered to each corresponding pattern.

Subsequently, a first external lead wire 31 having the other end connected to a flyback transformer (not shown) and the like,
External lead wires 30 are respectively connected to terminal accommodation rooms 32,
It is inserted into the lead connection chamber 27 and connected to the terminal 17 and the focus contact 7B to complete the assembly. In the attachment and connection work of these components, there is no solder connection process except for the process of mounting on the printed wiring board 120, so that assembly and connection work can be easily performed, and each component can be easily connected. Can be exchanged.

When the cathode ray tube is connected to the double focus type CRT socket 1 assembled as described above from the front side, each signal pin of the cathode ray tube elastically contacts the contact portion 6a of the leaf type signal contact 6. The focus pins 50A and 50B make elastic contact with the high-voltage contact portions 71 of the pair of focus contacts 7A and 7B.

As a result, as shown in FIG. 6, the first external lead wire 31 is connected to the focus pin 50 via the terminal 17, the resistor 16 and the first focus contact 7A.
A and the focus side discharge electrode plate 15A are electrically connected. Further, the second external lead wire 30 is electrically connected to the focus pin 50B via the second focus contact 7B.

As described above, the second focus contact 7
B connects only the second external lead wire 30, whereas the first focus contact 7 A connects the focus-side discharge electrode plate 15 A and the first external lead wire 31. A certain focus contact 70
Can be used for any of the contacts, thereby reducing the number of components and preventing defective products from being attached to the other side.

Further, as shown in FIG. 7, the connection connecting portion 72 of the first focus contact 7A and the pressure contact slit 28
Are formed so as to be substantially overlapped in the vertical direction, so that the insulating housing 2 can be downsized without increasing the connection space in the planar direction.

The present invention can be variously modified without being limited to the above embodiment. For example, the resistance element 16
Although the first focus contact 7A and the first focus contact 7A are connected by the pressure contact slit, the inner lead portion 16a may be directly soldered to the connecting plate 73 of the first focus contact 7A.
Further, it is not always necessary to connect the resistance element 16 in series between the first external lead 31 and the focus contact 7A, and the first external lead 31 may be connected to the terminal 17 or a lead connected to the terminal 17. The present invention can also be applied to a double focus type CRT socket directly connected to the first focus contact 7A.

In the above-described embodiment, the high-pressure contact portions 71 of the focus contacts 7A and 7B are formed in a leaf shape. Is also good.

The focus contacts 7A and 7B
May not necessarily be radially attached to the insulating housing 2 as long as the focus contacts 70 have the same shape.

[0078]

According to the first aspect of the present invention, the same component can be used for the two focus contacts 7A and 7B, and the manufacturing cost of the component can be reduced. Further, the focus contact 70 can be attached without being conscious of which of the focus contacts 7A and 7B, and the workability of assembly is improved.

According to the second aspect of the present invention, in addition to the first aspect of the present invention, the connection connection portion and the press contact slit of the first focus contact 7A are formed at different positions in the vertical direction of the insulating housing. The focus-side discharge electrode plate and the resistance element can be connected to the first focus contact without taking up a space in the plane direction.

According to the third aspect of the present invention, in addition to the first or second aspect, a pair of focus contacts 7A and 7
Since B is radially arranged, the connection connecting portions are separated from each other. Therefore, the creepage distance between the focus contacts or between the focus-side discharge electrode plate connected to these and the second external lead wire naturally becomes longer, and the insulation can be performed more reliably. Also, two focus contacts 7A,
Since the rear end of 7B is separated, a discharge chamber can be formed without providing a useless space therebetween.

According to the invention of claim 4, in addition to these inventions, the high-pressure contact portion can be formed by simple processing.

[Brief description of the drawings]

FIG. 1 is a perspective view of a double focus type CRT socket 1 according to an embodiment of the present invention.

2A and 2B show various parts of the insulating housing 2, wherein FIG. 2A is a plan view of a socket body 3, and FIG.

FIG. 3 is a CRT showing a part of the socket body 3 cut away.
FIG. 2 is a bottom view of the socket 1.

FIG. 4 is an exploded perspective view of a cover 5;

5A is a front view of the focus contact 7, FIG.
(B) is the same side view, (c) is the same bottom view.

FIG. 6 is a perspective view showing a connection state inside the cover 5.

FIG. 7 is a longitudinal sectional view of the cover part 5 and the socket body 3.

8 is a partially broken side view of the double focus type CRT socket 1. FIG.

FIG. 9 shows a conventional double focus type CRT socket 10.
1 is a plan view of FIG.

FIG. 10 is a rear view of a main part of the CRT socket 101 excluding a bottom cover 102c.

FIG. 11 shows a pair of focus contacts 105A and 10A.
It is a principal part perspective view which shows the connection structure of 5B.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Double focus type CRT socket 2 Insulating housing 7A 1st focus contact 7B 2nd focus contact 8 Base insertion hole 15A Focus side discharge electrode plate 15B Ground side discharge electrode plate 16 Resistance element 17 Terminal 28 Pressure contact slit (1st connection connection part) Reference Signs List 70 Focus contact 71 High voltage contact part 72 Connection part 73 Connection plate

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[Procedure amendment]

[Submission date] August 16, 2000 (2008.1.
6)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0040

[Correction method] Change

[Correction contents]

The base insertion holes 8, the Soviet Union the base of the cathode-ray tube
The base is formed in a cylindrical shape having an inner diameter slightly larger than the outer diameter of the base so as to be inserted from the surface side of the ring-shaped portion 3c in front of the ket main body 3 . In the socket body 3, signal contact accommodating chambers 9 are recessed from the back side at nine positions on the same circumference outside the base insertion holes 8 from the rear side (see FIG. 7). The upper part communicates with the front side.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0044

[Correction method] Change

[Correction contents]

In front of the base 3a, three slits 1 are provided.
2, 12, 12 define a pair of fan-shaped recesses 4, 4 centering on the base insertion hole 8. Fan-shaped recesses 4, 4
Is located on the same circumference as the front ring-shaped portion 3 c of the socket body 3, and the partition 13 a covering the periphery of the sector-shaped recesses 4, 4 constitutes a part of the inner wall of the base insertion hole 8. .

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0066

[Correction method] Change

[Correction contents]

[0066] Terminal 17, a locking claw projecting on its side surface and to engage with the inner surface of the terminal accommodating chamber 32, data
Is positioned and fixed to the Minaru accommodation chamber 32, as shown in FIG. 7, the lead connecting pieces 17a of the surface side, is narrowed Terminal
The first external lead 31 inserted from the front side is sandwiched and electrically connected to the lower part of the middle of the container housing 32 .

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0070

[Correction method] Change

[Correction contents]

Subsequently, a first external lead wire 31 having the other end connected to a flyback transformer (not shown) and the like,
External lead wires 30 are respectively connected to terminal accommodation rooms 32,
It is inserted into the lead connection chamber 20 and connected to the terminal 17 and the focus contact 7B to complete the assembly. In the attachment and connection work of these components, there is no solder connection process except for the process of mounting on the printed wiring board 120, so that assembly and connection work can be easily performed, and each component can be easily connected. Can be exchanged.

[Procedure amendment 5]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

[Procedure amendment 6]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction contents]

FIG. 2

[Procedure amendment 7]

[Document name to be amended] Drawing

[Correction target item name] Fig. 6

[Correction method] Change

[Correction contents]

FIG. 6

[Procedure amendment 8]

[Document name to be amended] Drawing

[Correction target item name] Fig. 9

[Correction method] Change

[Correction contents]

FIG. 9

Claims (4)

[Claims] 1. A cathode ray tube is attached to an insulating housing (2) in which a cathode ray tube is fitted and connected, and one (50A) of two focus pins (50) of the cathode ray tube is connected to a discharge electrode plate (15A).
A first focus contact (7A) electrically connected to the first external lead wire (31); and the other of the two focus pins attached to the insulating housing (2) insulated from the first focus contact (7A). (50B) and a second focus contact (7B) for electrically connecting to a second external lead wire (30). A connecting plate (73) bent in a U-shape, a high-pressure contact portion (71) connected to one end of the connecting plate (73) and in contact with the focus pin (50), and another end of the connecting plate (73) are further provided. A pair of focus contacts (70) having the same shape and having a connection connection portion (72) bent into a leaf spring piece is formed, and one focus pin (50) is formed on the insulating housing (2).
A) is inserted into the first pin contact chamber (18A), the connection connection chamber (26) facing a part (15a) of the discharge electrode plate (15A), and the other focus pin (50B) is inserted. A second pin contact chamber (18B) and a lead connection chamber (20) into which a second external lead wire (30) is inserted are recessed, and a high-pressure contact portion (7) of one focus contact (70) is formed.
1) and the connection connector (72) are accommodated in the first pin contact chamber (18A) and the connection connector chamber (26), respectively, and are brought into contact with one focus pin (50A) and the discharge electrode plate (15A), Connect the first external lead wire (3
1) is electrically connected to the first focus contact (7A)
And the high-voltage contact portion (7) of the other focus contact (70)
1) and the connection connector (72) are accommodated in the second pin contact chamber (18B) and the lead connection chamber (20), respectively, and are brought into contact with the other focus pin (50B) and the second external lead wire (30). And a second focus contact (7B). 2. A press contact slit (28) is formed at a bent portion of the connecting plate (73) along the longitudinal direction of the connecting plate (73), and is connected in series with the first external lead wire (31). The double focus type CRT socket according to claim 1, wherein one side lead portion (16a) of the resistance element (16) to be connected is press-contacted. 3. A base insertion hole (8) through which a base of a cathode ray tube is inserted in an insulating housing (2), and a first pin contact chamber (18A), a connection connection chamber (26), and a second pin contact. The double focus type CR according to claim 1 or 2, wherein the chamber (18B) and the lead connection chamber (20) are radially recessed from the center of the base insertion hole (8).
T socket. 4. A double-focus type CRT according to claim 1, wherein a leaf spring piece obtained by further bending one end of the connecting plate (73) is used as a high-pressure contact portion (71). socket.