JPH0117111Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a cathode ray tube socket which has a protective function by generating discharge when an excessive voltage is applied and dropping the excessive voltage to ground.

In this type of cathode ray tube socket, it has been proposed that when a grounding ring is externally attached to a ring-shaped groove formed in the socket body, a discharge gap is created between the grounding ring and the contacts housed in the socket body. has been done. Although this configuration is extremely easy to assemble, there is a risk that dirt may enter the discharge gap from the outside through the ring-shaped groove and change the discharge characteristics.

The object of this invention is to provide a cathode ray tube socket that is extremely easy to assemble, is difficult to get dust in, and can maintain predetermined discharge characteristics.

According to this invention, when an electrode piece is bent and protruded at a nearly right angle to the ground ring and the ground ring is attached to the outer surface of the socket body from the outside, the discharge gap chamber is sealed at the connection between the electrode piece and the ground ring. configured.

An example of a cathode ray tube socket according to this invention will be explained below with reference to the drawings.

As shown in FIGS. 1 to 3, the socket body 11 made of an insulating material consists of a disc-shaped contact holding part 12 and a high-pressure discharge gap part 13 provided on one side thereof. A center hole 14 is formed through the contact holding portion 12, and a plurality of contact accommodating portions 15 are formed at equal intervals on a circle around the center hole 14.
A contact 16 is accommodated in each of these contact accommodating portions 15, respectively. In this embodiment, when a so-called bi-orket type contact is used as the contact 16, an axis (center hole 1
4) parallel grooves are formed to serve as contact housing portions 15.

5 on both sides of the groove bottom of the contact accommodating portion 15.
As shown in FIG. 6, a guide groove 18 is formed parallel to the axis. One end of the contact 16 is bent diagonally so that the contact portion 19 that contacts the terminal of the cathode ray tube approaches the rear as it approaches the axis, as shown in FIGS. 2 and 7 to 9. The front end of the contact portion 19 is folded back to form a mounting portion 21, and engagement edges 2 are provided on both side edges of the mounting portion 21.
2 and a claw 23 are each integrally formed to protrude. The mounting portion 21 is brought into contact with the bottom surface of the groove of the contact accommodating portion 15 and is inserted into the accommodating portion 15 from the back surface of the socket body 11 toward the front.
2. The claws 23 are inserted into and engaged with the guide grooves 18, respectively, and the claws 23 engage with the wall surfaces of the guide grooves 18 to prevent the mounting portion 21 from coming off toward the center hole 14 side and the rear of the main body 11. Attachment section 2 is attached to this accommodation section 15.
1 is attached, the contact portion 19 projects from the housing portion 15 into the center hole 14.

The end of the mounting portion 21 opposite to the contact portion 19 is bent and extended to the side opposite to the contact portion 19 (the side opposite to the center hole 14) to form a holding portion 24, and locking claws 25 are provided on both side edges of the holding portion 24. It is formed in one piece. Holding part 2
The end of 4 is bent and extended rearward to form a planar discharge electrode section 26, and fixed edges 27 are integrally formed on both side edges thereof. The bottom of the groove in the rear half of the contact accommodating portion 15 is deepened as shown in FIGS. 2, 3, and 5.
As shown in FIG. 6, a holding recess 28 is formed,
Fixing grooves 29 are formed on both sides of the bottom surface of the holding recess 28 . The fixing edge 27 is inserted into the fixing groove 29 so that the holding recess 28 forms a step with the contact accommodating part 15 and the holding part 24 of the contact 16 is opposed to the holding surface 31 perpendicular to the axis. and discharge electrode part 2
6 is brought into contact with or closely opposed to the bottom surface of the holding recess 28 . At this time, the locking pawl 25 engages with the wall surface of the holding recess 28 to prevent the contact 16 from coming off backward. Further, the position of the discharge electrode portion 26 with respect to the axis is defined.

As shown in FIGS. 2, 7 to 9, the rear end of the discharge electrode section 26 is bent and extended in a direction opposite to the axis, and then bent and extended rearward again to form a terminal 32.
It is said that Locking edges 33 are integrally formed on both sides of the base of the terminal 32. Corresponding to the shape of this contact 16, a second
As shown in FIGS. 3, 5, and 6, the terminal recess 34 communicates with the holding recess 28 and is formed at the back of the holding recess 28 on the opposite side of the axis. Locking grooves 35 are formed on both sides of the surface of the terminal recess 34 facing the center hole 14, and the locking edge 33 is inserted into and engaged with the locking groove 35, so that the base of the terminal 32 is inserted into the terminal recess 34. Retained.

In this invention, as shown in FIGS. 1 and 2, a grounding ring 37 is disposed on the outside of the socket body 11 approximately concentrically with the axis of the socket body 11.
7 is integrally formed with an electrode piece 38 projecting approximately at right angles thereto. An electrode groove 39 is formed adjacent to the discharge electrode portion 26 of the contact 16 and parallel to the discharge electrode portion 26 so as to communicate with the outside of the socket body 11 . The electrode piece 38 is inserted and fitted into the electrode groove 39, and the electrode piece 38 faces the discharge electrode section 26. At this time, the ground ring 37 is positioned on the discharge electrode section 26 side with respect to the electrode piece 38.

That is, in this embodiment, as shown in FIGS. 1 and 10, a ground ring 37 is punched out from a metal plate in the form of an open ring. At this time, the planar electrode piece 38 is integrally bent and extended rearward from the outer peripheral edge of the ground ring 37 at a substantially right angle to the plane formed by the ring.
The angular spacing between adjacent electrode pieces 38 is approximately equal to the angular spacing between contacts 16 . A discharge electrode 41 is hemispherically protruded from the inner surface of each array of electrode pieces 38 .

As shown in FIG. 1, FIG. 2, FIG. 4, and FIG.
The portion where the discharge electrode portion 26 is located is larger than the portion where the discharge electrode portion 26 is located, and a step portion 42 is formed parallel to the front surface 17 between the small diameter portion and the large diameter portion. A shallow ring-shaped recess 43 is formed in this step 42,
The grounding ring 37 is fitted into the ring-shaped recess 43 . Each retaining recess 28 and its center hole 14 are adjacent to each other.
the electrode groove 3 from the stepped portion 42 so that it is located opposite to the
9 is formed. The intermediate portion of the electrode groove 39 along the circumferential direction of the center hole 14 and the holding recess 28 are communicated with each other to form a discharge gap chamber 44 . In this example, a notch 45 is also formed on the opposite side of the electrode groove 39 from the discharge gap chamber 44 so as to communicate with the electrode groove 39 . The electrode piece 38 is fitted and inserted into the electrode groove 39 .

Connecting portion 38a between grounding ring 37 and electrode piece 38
is a slope of about 45 degrees, and correspondingly, a connecting recess 46 is formed between the ring-shaped recess 43 and the electrode groove 39.
The bottom surface thereof is an inclined surface that contacts the connecting portion 38a, and the connecting portion 38a is fitted into the connecting recess 46. Presser claws 47 are integrally formed to protrude from both side edges of the electrode piece 38, and the presser claws 47 also protrude from the side opposite to the center hole 14. Therefore, when the electrode piece 38 is inserted into the electrode groove 39, the presser pawl 47 engages with the wall surface of the electrode groove 39 to prevent it from coming off, and the electrode piece 38 is held in the holding recess 28 side of the electrode groove 39. Press it against the wall. Since the position of the discharge electrode part 26 of the contact is determined by the fixing groove 29, the distance between the discharge electrode part 26 and the electrode piece 38 is a constant value.

The discharge electrode 41 of the electrode piece 38 and the discharge electrode portion 26 are closely opposed to each other, and a discharge gap is formed between them in which electric discharge occurs at a predetermined voltage or higher. This discharge gap is formed by inserting and assembling the contact 16 as described above.
By inserting and assembling the electrode pieces 38, electrodes with a predetermined spacing can be automatically obtained. Therefore, when an overvoltage of a predetermined value or more is applied to the contact 16, a discharge occurs between the discharge electrode portion 26 of the contact 16 and the discharge electrode 41 facing it, and the overvoltage is transmitted through the grounding ring 37. dropped to the ground.

As described above, according to the cathode ray tube socket of this invention, since the electrode piece 38 is bent with respect to the ground ring 37 and fitted into the electrode groove 39, this electrode piece 38 (and its connection The discharge gap chamber 44 is closed off from the outside by the portion 38a).
Therefore, the predetermined discharge characteristics can be maintained without dust entering from the outside. Furthermore, by attaching the grounding ring 37 to the outer surface of the socket body 11 from the outside, a predetermined discharge gap is formed, and a sealed discharge gap chamber 44 is constructed, so that the assembly work is extremely simple.

In order to change the discharge characteristics, the protrusion length of the hemispherical electrode 41 may be changed. The hemispherical electrode 41 may be formed on the discharge electrode portion 26 of the contact, or the hemispherical electrode may be formed on both the electrode piece 38 and the discharge electrode portion 26. The discharge electrode 41 does not have to be hemispherical. Further, the discharge electrode portion 26 may be arranged outside the electrode piece 38, and in that case as well, the grounding ring 37 is positioned outside the electrode piece 38 so as to be on the discharge electrode portion 26 side. Although the discharge electrode portion 26 and the electrode pieces 38 are arranged parallel to the axis, they may be arranged at right angles to the axis, and the plate surface of the ground ring 37 may be parallel to the axis. However, in this case, the ground ring 37
It is difficult to punch out a metal plate in a predetermined curved state, and it is necessary to bend it into a ring shape after punching. The contact 16 may be of a type in which a cathode ray tube terminal is inserted into a cylindrical portion.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of a cathode ray tube socket according to this invention, FIG. 2 is a front view of the contact holding portion 12 shown in FIG. The figure is a plan view showing the socket body 11 with the front plate of the high voltage discharge gap removed, FIG. 5 is a longitudinal sectional view of FIG. 4, FIG. 6 is a bottom view of FIG. 4, and FIG.
The figure is a perspective view of the contact 16, FIG. 8 is a front view of the contact 16, FIG. 9 is a side view of the contact 16, and FIG.
FIG. 0 is a perspective view of the grounding ring 37. DESCRIPTION OF SYMBOLS 11...Socket body, 15...Contact accommodating part, 16...Contact, 19...Contact contact part, 26...Discharge electrode part of contact, 37
...Grounding ring, 38...Electrode piece, 39...Groove for electrode, 44...Discharge cavity chamber.

Claims (1)

[Scope of utility model registration request] A plurality of contact accommodating portions are arranged and formed on a single circle in a socket body made of an insulating material,
Contacts to be connected to the terminals of the cathode ray tube are respectively accommodated in these contact accommodating portions,
A portion of at least one of these contacts is a discharge electrode portion, and an electrode groove facing the discharge electrode portion is formed in the socket body to communicate with the outside,
An electrode piece is inserted into each of these electrode grooves and faces the discharge electrode part, a discharge gap is formed between these electrode pieces and the discharge electrode part, and a ground ring that is approximately concentric with the circle is attached to each of the electrode pieces. The cathode ray tube socket is disposed on the outer surface of the socket body on the side of the discharge electrode portion, and the outer ends of the electrode pieces are bent and connected to the ground ring, respectively, to form an integral structure.