JPH0113352Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a cathode ray tube socket having a built-in discharge gap for dropping the excessive voltage to ground when an excessive voltage is applied.

In a conventional cathode ray tube socket of this kind, for example, as shown in FIG. are integrally extended rearward, a ring-shaped grounding conductor 14 is disposed facing the middle part of the terminal part 13, a discharge electrode 15 is protruded from the terminal part 13 facing the grounding conductor 14, and the discharge electrode A discharge gap 16 was formed between the discharge gap 15 and the ground conductor 16. Although the contacts 11 and the ground conductor 14 are not shown in the drawings, they are held within the socket body made of an insulating material. Alternatively, as shown in FIG. 2, the terminal portion 13 of the contact 11 is bent and extended in the lateral direction from the spring portion 12, and then bent backward, and the discharge electrode 15 is formed at the lateral extension of the terminal portion 13. It had been.

In any case, since the discharge electrode 15 was formed on the terminal part 13 of the contact, the length in the axial direction (height direction) of the socket in the case of Fig. 1 becomes large, and the length in the lateral direction in the case of Fig. 2 increases. The length increases,
It has been difficult to reduce the size of the socket.

This invention aims to provide a cathode ray tube socket that can be made smaller and has a discharge gap with high dimensional accuracy by providing a discharge electrode in the spring portion of the contact.

An embodiment of the cathode ray tube socket according to this invention will be described with reference to the drawings from FIG. 3 onwards. As shown in FIGS. 3 and 4, the socket body 21 is made of insulating material.
has a substantially disk-like shape as a whole, and has a center hole 22 formed in the axial direction. In this example, the main body 21 is composed of a front body 23 and a back body 24, and a plurality of hooks 25 integrally formed on the back body 24 extend to the circumferential surface of the front body 23, and are formed on the circumferential surface of the front body 23. The bodies 23 and 24 are connected to each other by being engaged with the engaging protrusion 26 .

Contact accommodating portions 27 are formed extending in the axial direction and penetrating the center hole 22 at equal intervals on the circumference. The spring portions 12 of the contacts 11 are accommodated in each contact accommodating portion 27, and the terminal portions 13 of the contacts 11 are projected to the rear of the socket body 21 through small holes 28 formed in the back body 24.

In the arrangement circle of the contacts 11, high-voltage contacts 11' (FIG. 5) are housed in the contact accommodating portion 27' at intervals twice as large as the intervals between the contacts 11. A high voltage discharge gap 2 is provided on the side of the socket body 21 on the high voltage contact 11' side.
9 is provided. A fifth in the high voltage discharge gap 29
As shown in the figure, hemispherical electrodes 31 and 32 are housed facing each other, and a high voltage discharge gap is formed between the electrodes 31 and 32. Terminal part 1 of high voltage contact 11'
3' is bent and extended in the lateral direction and is integrally connected to the electrode 31. This high voltage connection to the contact 11' is made by inserting the core wire 34 of the lead wire 33 into the introduction hole 36 formed in the front plate 35 of the discharge cavity 29, as shown in FIG.

As shown in FIGS. 6 and 7, the electrode 31 is constructed by extruding the center part of a rectangular electrode plate 37 into a hemispherical shape, and a part of one side edge of the electrode plate 37 is formed by contact 1.
After being integrally bent and extended toward the 1' side, the electrode plate 37
The front edge of the folded portion 38 is extended forward and then folded back diagonally to approach the electrode plate 37 side to form a pressure contact piece 39. The free end of the pressure contact piece 39 substantially contacts the electrode plate 37, and the contact portion faces the lead wire introduction hole 36 relatively closely. The folded portion 38 is in contact with a wall 41 extending in the front-rear direction within the discharge gap 29 . The core wire 34 inserted through the introduction hole 36 is elastically inserted between the pressure contact piece 39 and the electrode plate 37 and electrically connected to each other. At this time, a groove 42 as shown in FIG. 8 is formed at the free end of the pressure welding piece 39 so that the core wire 34 is sandwiched between the pressure welding piece 39 and the electrode plate 37 without escaping. Good.
A cylindrical holding part 43 that guides and holds the lead wire 33 is
It is integrally formed on the front surface of the discharge cavity 29 with the introduction hole 36 at the center. As shown in FIG. 5, a ground terminal 44 integral with the electrode 32 projects rearward.

In this invention, the spring portion 1 of the contact 11
The base part 2 is a fixed part that is positioned with respect to the socket main body 21, and this fixed part is provided with a flat part. For example, as shown in FIGS. 9 to 11, both side edges of the rectangular plane part 46 are bent and extended in the same direction at almost right angles to form side parts 47 and 48, and the front edges of these side parts 47 and 48 Holding piece 5 more integrally
1,52 are extended forward. Clamping piece 51,
52 are bent in a dogleg shape so as to approach each other. Shallow recesses 53 and 54 are formed in the center of the portions of the clamping pieces 51 and 52 that are close to each other, so that the terminal pin can be inserted elastically between the clamping pieces 51 and 52 to securely clamp the terminal pin. It is being done. The fixed part 4 is fixed by the flat part 46 and the side parts 47 and 48.
The fixing portion 49 and the clamping pieces 51 and 52 constitute the spring portion 12. The terminal portion 13 extends rearward integrally from the rear edge of the flat portion 46, and a reinforcing rib 55 is formed at the peripheral edge of the terminal 13.

A discharge electrode 56 is formed protruding from the flat portion 46 on the side opposite to the holding pieces 51 and 52. In the figure, the discharge electrode 56 is hemispherical, but it may also be a bent piece. Both side parts 47 and 48 of the fixing part 49 are formed into positioning pieces 47a and 48a that protrude from the flat part 46 more than the clamping pieces 51 and 52, respectively, and are inserted into the positioning grooves of the socket body 21, respectively, to facilitate the insertion. In order to do this, each mountain is formed as an array of multiple triangular peaks. Further, the flat portion 46 is integrally extended forward (in the opposite direction to the terminal portion 13), and the extended portion thereof is extended to both sides facing the ends of the clamping pieces 51 and 52 to form projecting pieces 57 and 58, The protrusion 5
Triangular protrusions 57a,
58a is pushed out to the side of the clamping pieces 51 and 52.

Such a contact 11 is a socket body 21.
It is positioned and accommodated. As shown in FIGS. 12 and 13, the contact accommodating portion 27 is formed in a rectangular shape from the back surface of the front body 23 toward the front.
The center of the front end is a small hole 27a into which a terminal pin is inserted. One of the inner surfaces of the rectangular contact accommodating portion 27 is arranged substantially on a cylindrical surface centered on the center hole 22, and positioning grooves 61 and 62 are formed on both sides of the inner surface, respectively, from the back toward the front. . The depth direction of the positioning grooves 61 and 62 is directed toward the center hole 22. On both sides of another surface of the contact accommodating portion 27 that is substantially parallel to the cylindrical surface, fixing grooves 63 and 64 whose depth is in the circumferential direction are formed from the back surface to near the front end. The contact 11 has fixed pieces 57, 58 as shown in FIG.
are guided and inserted into the fixing grooves 63 and 64, respectively, the spring part 12 is inserted into the housing part 27 from the back side, and the positioning pieces 47a and 48a are inserted into the positioning grooves 61 and 62.
It is inserted and fitted inside. The flat portion 46 is in contact with one inner surface of the contact accommodating portion 27 . Fixed piece 57,5
8 has fixing grooves 63 and 64 formed by protrusions 57a and 58a.
Press-fitted inside. As a result, the spring part 12 of the contact is correctly positioned, especially in the radial direction relative to the center hole 22.

The ring-shaped ground conductor 14 is connected to the socket body 21 in close opposition to the arrangement of the discharge electrodes 56 of the contact 11.
contained within. As shown in FIGS. 12 and 13, a ring-shaped groove 65 is formed on the back surface of the front body 23 concentrically with the center hole 22, adjacent to the arrangement circle of the contact accommodating portion 27, and on the outside thereof. 6
5 are in communication with each contact accommodating portion 27 through a discharge cavity 66, respectively. The discharge electrode 56 of the contact is connected to the discharge cavity 66 as shown in FIG.
located within. The ring-shaped ground conductor 14 is accommodated within the ring-shaped groove 65 . By fitting the grounding conductor 14 into the ring-shaped groove 65 with the diameter of the grounding conductor 14 being slightly larger than the diameter of the ring-shaped groove 65, the grounding conductor 14 is brought into close contact with the outer peripheral surface of the ring-shaped groove 65, and its radial direction The position is determined correctly. Therefore, the distance between the ground conductor 14 and the discharge electrode 56, that is, the discharge gap, becomes constant. As shown in FIG. 4, the ground conductor 14 is pressed against the bottom surface of the ring-shaped groove 65 by the rear body 24.

According to this embodiment, the spring portion 12 of the contact 11 and the ground conductor 14 face each other, and the discharge electrode 56 is not located in the terminal portion 13, so that the total length of the contact 11 can be shortened, and the height of the socket can be reduced. Alternatively, the horizontal length can be reduced, allowing for miniaturization. A fixing part 49 is provided on the spring part 12, and a part thereof is attached to the flat part 4.
6, and since the holding pieces 51 and 52 are formed on both sides of the flat part 46, the position and shape of the electrode 56 are not affected even if the terminal pin is inserted into the spring part 12, and a predetermined discharge gap is maintained. Ru. In particular, when positioning with respect to the socket body 21 is performed using the fixing part 49 and the fixing part 49 is fixed to the socket body 21, the position of the electrode 56 is determined and is not affected by the insertion and removal of the terminal pin. hard. Further, the flat portion 46 is pressed against the surface of the socket body 21, and the electrode 56 is accurately positioned.

The spring portion 12 of the contact may have a cylindrical shape as shown in FIG. The ground conductor 14 may be closely opposed to the inner peripheral surface of the contact array. The ground conductor 14 is not limited to one having a circular cross section, but may be a belt-shaped one, and in that case, a protrusion of a discharge electrode may be provided on the ground conductor.

[Brief explanation of the drawing]

1 and 2 are diagrams showing the discharge gap in a conventional cathode ray tube socket, FIG. 3 is a plan view showing an example of the cathode ray tube socket according to this invention, and FIG. 4 is a partially cutaway view of the cathode ray tube socket. Figure 5 is a sectional view taken along line AA in Figure 3, Figure 6 is a front view of Figure 3.
BB sectional view, FIG. 7 is a perspective view showing the contact 11' and the electrode 31, FIG. 8 is a diagram showing the relationship between the grooves 42 of the pressure contact piece 39, and FIG. 9 is a perspective view showing the contact 11' and the electrode 31.
Figure 10 is the right side view of Figure 9, and Figure 1 is the front view of Figure 1.
1 is a plan view of FIG. 10, FIG. 12 is a rear view of the front body 23, FIG. 13 is a sectional view taken along line CC of FIG. 12, and FIG. 14 is a perspective view showing the main parts of another example of this invention. It is a diagram. 11: Contact, 12: Spring part, 13: Terminal part, 14: Ground conductor, 21: Socket body, 2
7: Contact housing portion, 46: Plane portion, 49: Fixing portion, 47a, 48a: Positioning piece, 51, 5
2: holding piece, 56: discharge electrode, 61, 62: positioning groove, 65: ring-shaped groove, 66: discharge gap chamber.

Claims (1)

[Scope of utility model registration request] Contact accommodating portions are formed on the socket body made of insulating material at equal intervals on the same circumference, contacts are accommodated in each of these contact accommodating portions, and a spring portion into which the terminal pin of the cathode ray tube of each contact is elastically inserted is formed. The base is a fixed part positioned on the socket main body, a common ring-shaped ground conductor is held in the socket main body opposite to this fixed part, and a flat part is provided on the part of the fixed part facing the ground conductor. A cathode ray tube socket comprising: a discharge electrode protruding from a flat surface thereof toward the ground conductor, and a discharge gap defined between the discharge electrode and the ground conductor.