JPH118003A - Contact type connection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep correct contact of a contact pin with a holder and prevent contact failure by fastening one end of a coil spring made of a conductor in the diameter direction of a receiving boss within the holder to connect to the boss, and fastening the other end of the coil spring in the diameter direction of a receiving boss formed in the contact pin to connect to the boss. SOLUTION: A contact pin 66 is energized outward with a coil spring 78 arranged within a recess 77 of a holder 67. A receiving boss 79 on the holder 67 side is formed within the recess 77, and a receiving boss 80 is formed so as to face the receiving boss 79 to the contact pin 66. Both ends of the coil spring 78 are forced to extend in the radial direction and the receiving bosses 79, 80 are pushed in the coil spring 78 to connect to the coil spring 78. The coil spring 78 is a compressed coil spring made of phosphor bronze, and plated with 0.1 μm thick gold. The outer circumferential surface on base end side of the contact pin 66 is brought into contact with the inner circumferential surface of the recess 77, and even if centrifugal force is applied, correct contact is kept.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact-type connecting device, and more particularly to a contact-type connecting device in which a contact pin urged by a spring is brought into contact with a portion to be connected to make a connection.

[0002]

2. Description of the Related Art Generally, lead wires have been used to achieve electrical connection. That is, by peeling off the insulating coatings at both ends of the lead wire and soldering both ends of the lead wire to the connection portion and the connected portion, electrical connection between the two is achieved. Although such connection makes it possible to make a reliable connection, if it is necessary to separate the connection part from the connected part, the solder connecting the lead wire to the connection part or the connected part should be used. It must be melted and thereby disconnected once.
Then, when assembling, it is necessary to re-solder the portion where the solder has been melted to make connection.

[0003] In view of such a drawback, a contact type connection device is used. The contact type connection device is configured to perform connection by pressing a contact pin against a connected portion by a spring. In this case, since the contact pins are simply crimped and connected to the connected portion, it is possible to remove both as necessary, and when assembling again, the contact pins are connected to the connected portion. A simple crimped connection is required, which greatly facilitates disassembly and assembly and improves serviceability.

FIG. 11 shows a contact type connection device used for a rotary head drum of a conventional VTR.
Here, the circuit on the printed circuit board 1 and the connection lands 3 constituting the terminals on the head base 2 are connected by a contact type connection device.

[0005] The contact type connecting device includes a holder 4,
The lead 5 provided at the lower end thereof is inserted through the insertion hole of the printed circuit board 1 and soldered to the connection land 6 for connection. Then, the contact pins 7 slidably supported by the holder 4 are urged upward by the compression coil springs 8 and the tips of the contact pins 7 are connected to the connection lands 3 provided on the lower surface of the printed circuit board 1. The electrical connection is made by crimping.

In particular, in the configuration shown in FIG. 11, an eccentric spring is used as the compression coil spring 8, and the contact pin 7 is intentionally inclined by such an eccentric spring. 4
, So that the contact pin 7 and the holder 4 are kept electrically connected to each other.

FIG. 12 shows a contact type connection device having another configuration. Here, the lower surface of the contact pin 7 slidably held by the holder 4 is inclined so that the inclined surface 11
And the compression coil spring 8
Are contacted to urge the contact pins 7 upward. Such an inclined surface 11 produces the same operation as that of the eccentricity of the compression coil spring 8, and the contact point 9
In this case, the contact pin 7 and the holder 4 are surely in contact with each other.

[0008]

According to the structure shown in FIG. 11, the eccentric direction of the eccentric spring 8 cannot be seen from the outside, and the circumferential position between the contact pin 7 and the holder 4 cannot be determined. Therefore, when the centrifugal force in the direction indicated by the arrow F is applied to the contact-type connecting device when mounted on the rotary head drum, the bias force caused by the eccentricity of the compression coil spring 8 can be canceled by the centrifugal force F. There is. Then, the contact pin 7 at the contact point 9
And the holder 4 is securely contacted. That is, there is a problem that the contact force at the contact point 9 varies greatly. Such a phenomenon is the same in the case of the structure shown in FIG. 12 in which the compression coil spring 8 is received by the inclined surface 11 of the contact pin 7.

Further, the contact type connecting device used for the rotary head drum of the VTR has a small size, and accordingly, the surface inside the cavity of the holder 4 for slidably holding the contact pin 7 has a rough surface. In addition, the contact pins 7 are easily hooked by the sliding resistance. Therefore, the contact pin 7 may be twisted and caught inside the holder 4 due to a temperature change. If the contact pins 7 are hooked into the holder 4 with the tip of the contact pins 7 separated from the connection lands 3 of the printed circuit board 1, the electrical connection between the contact pins 7 and the printed circuit board 1 is established. No longer achieved, and the resistance between them becomes infinite.
That is, the original function of the contact type connection device cannot be achieved.

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and enables a contact pin to be maintained in a state of correctly contacting a holder even when a centrifugal force is applied. It is an object of the present invention to provide a contact-type connection device that is prevented from being twisted and not moving to cause a connection failure.

[0011]

According to the present invention, there is provided a holder having a lead, a contact pin slidably held by the holder, and disposed in the holder.
A coil spring for urging the contact pin so that a tip end of the contact pin projects from the holder, wherein the coil spring is made of a conductor and one end of the coil spring is provided in the holder. The boss is connected to the receiving boss so as to be diametrically fastened, and the other end of the coil spring is connected to the receiving boss so as to diametrically tighten the receiving boss provided on the contact pin. And a contact-type connection device. With such a configuration, the connection between the holder and the contact pin can be achieved by the coil spring.

[0012] The inner diameter of the coil spring may be smaller than the outer diameter of the receiving boss of the holder and the receiving boss of the contact pin. Further, the coil spring may be made of phosphor bronze, and the surface thereof may be plated with gold.

According to another aspect of the present invention, there is provided a holder having a lead, a contact pin slidably held by the holder, and disposed in the holder, and a tip end of the contact pin projects from the holder. And a coil spring for urging the contact pin as described above,
The coil spring is adapted to apply a bias force to the contact pin such that the contact pin acts radially at a predetermined position in a circumferential direction of the housing, and furthermore, that the contact pin rotates with respect to the housing. The present invention relates to a contact type connection device having a rotation preventing means for preventing rotation. With such a configuration, it is possible to prevent the contact between the holder and the contact pin due to the bias force of the coil spring from being canceled by the centrifugal force.

The biasing force may be generated by mounting the coil spring eccentrically with respect to an axis, or the end of the coil spring may be received by an inclined receiving surface of the contact, whereby the end of the coil spring is received. A bias force may be generated at the contact pin. Further, the coil spring may be made of phosphor bronze, and the surface thereof may be plated with gold.

[0015]

FIG. 1 shows a rotary head drum device of a VTR in which a contact type connection device according to an embodiment of the present invention is used. The rotary head drum device has a mounting bracket. 16 is provided. A lower drum 17 composed of a fixed drum is supported by a mounting bracket 16. An upper drum 18 composed of a rotating drum is disposed on the fixed drum 17. A head base 19 is attached to the lower surface of the rotary drum 18 by a screw 20 at a portion facing the outer peripheral side. The magnetic head 2 is provided at the tip of the head base 19.
1 is attached.

A rotary shaft 24 is provided so as to penetrate the lower drum 17 in order to drive the rotary drum 18 to rotate. The rotating shaft 24 is rotatably supported on the fixed drum 17 by upper and lower bearings 25 and 26, and a precompression spring 27 made of a compression coil spring is interposed between the bearings 25 and 26. The rotation shaft 24 is driven to rotate by a motor 28 directly connected to the lower end. A boss 30 is fixed to a lower end portion of the rotating shaft 24. A rotor yoke 31 is fixed to the boss 30, and the rotor yoke 31
A magnet 32 is attached to the inner peripheral surface of the. The magnet 32 is connected to the stator 33 through a minute air gap.
Are radially opposed to the outer peripheral surface of the. The stator 33 is fixed to the lower surface of the fixed drum 17 by a fixing bolt 36 via a spacer 34 and a printed board 35.

A flange 40 is fixed to the tip of the rotating shaft 24 and a connecting bolt 41 is attached to the flange 40.
The rotating drum 18 is fixed through the intermediary of the rotary drum 18. A ring-shaped printed board 42 is mounted on the flange 40. The printed circuit board 42 is electrically connected to the head base 19 on which the magnetic head 21 is mounted via a contact type connection device 43.

On the inner peripheral side of the fixed drum 17, a rotary transformer 45 for transmitting and receiving signals between the rotating side and the fixed side is arranged. The rotor 46 of the rotary transformer 45 is mounted below the flange 40. On the other hand, the stator 47 is attached to the inner peripheral portion of the fixed drum 17.

A plurality of mounting seats 50 are provided along the circumferential direction on the upper drum 18 composed of the rotating drum, and a printed circuit board 51 is mounted on the upper drum 18 via these mounting seats 50. ing. On the printed circuit board 51, a contact type connection device 52 is mounted. The contact type connection device 52 is configured to contact the terminal of the relay flange 54 provided at the base side portion of the center spindle 53, and to supply power to the printed circuit board 51 via the relay flange 54. I have. A cover 55 is attached to a portion on the outer peripheral side of the relay flange 54.

The center spindle 53 constitutes a power supply slip ring device.
The brush 59 elastically comes into contact with a slip ring 58 provided on the outer circumference along the circumferential direction. The center spindle 53 having such a slip ring 58 is covered by a housing 60. The power supply device including the slip ring 58 is mounted on the mounting bracket 16 via a connecting member 61.

In the above configuration, when the motor 28 is driven, the rotary drum 18 composed of the upper drum is driven to rotate via the rotary shaft 24 and the flange 40. Therefore, the magnetic tape wound obliquely on the outer peripheral surfaces of the upper drum 18 and the lower drum 17 comes into contact with the magnetic head 21 mounted on the lower surface of the rotating drum 18, and this magnetic head 21 causes the helical A scan is performed.

At this time, power is supplied between the slip ring 58 provided on the center spindle 53 and the brush 59 in the housing 60, and the power supplied to the slip ring 58 side is supplied to the lower surface of the relay flange 54. It is supplied to the upper printed circuit board 51 and the lower printed circuit board 42 via the contact type connection device 52 which contacts the terminals. Each of the printed boards 51 and 42 is provided with an amplifier circuit, and such an amplifier circuit is driven by power supplied from a fixed side via a slip ring 58.

On the other hand, transmission and reception of signals between the fixed side and the rotating magnetic head 21 are performed by a rotary transformer 45 arranged on the inner peripheral side of the lower drum 17. Rotor 46 of rotary transformer 45
A signal is transmitted and received between the motor and the stator 47. That is, the signal read by the magnetic head 21 is transmitted to the fixed side via the rotary transformer 45. The signal from the fixed side is transmitted to the printed circuit boards 42 and 51 on the rotating drum 18 through the rotary transformer 45.

Next, the printed circuit board 4 on the flange 40
The configuration of the contact type connection device 43 for achieving the electrical connection between the head base 19 and the head 2 will be described. As shown in FIGS. 2 and 3, the head base 19 includes a magnetic head 21 at a tip portion thereof, and a pair of terminals 65 are formed on the lower surface of the head base 19 by conductive lands. And such a conductive land 65
A contact type connection device 43 is used to achieve the connection between the substrate and the printed circuit board 42.

The contact type connecting device 43 includes a contact pin 66 which contacts the terminal 65 of the head base 19,
Holder 6 that slidably holds contact pin 66
7, and a lead 68 is provided on the holder 67 so as to protrude downward. The lead 68 is inserted into the lead insertion hole 69 of the printed circuit board 42 and is soldered to the connection land 70.

As shown in FIGS. 5 to 7, two contact type connection devices 43 are used in pairs, and two connection devices 43 are separated from each other by a predetermined distance by a connecting member 73. The contact type connection device 43 is connected. Note that an insulating synthetic resin material is used as the connecting member 73.

Next, such a contact type connection device 43 will be described.
8 will be described with reference to FIG. The contact type connecting device 43 has a concave portion 77 inside the holder 67, and a coil spring 78 is arranged in the concave portion 77 so that the contact 66 is pushed outward by the coil spring 78. It is energizing.

Here, a receiving boss 79 on the holder 67 side is formed in the concave portion 77, and a receiving boss 80 is provided on the contact pin 66 so as to face the receiving boss. And the coil spring 78 is provided with receiving bosses 79, 80 on both sides.
Is connected to each other. Here, the inner diameter of the coil spring 78 in the natural state is the receiving boss 79,
80 is smaller than the outer diameter. That is, the coil spring 78 is connected to the receiving bosses 79 and 80 so that both ends thereof are pushed and spread in the radial direction, respectively.

In this case, a compression coil spring made of phosphor bronze is used as the coil spring 78, and its outer surface is plated with gold having a thickness of about 0.1 μm. ing.

As described above, in the present embodiment, the receiving boss 7 is provided on the holder 67 and the contact pin 66, respectively.
9 and 80 are formed, and both ends of the coil spring 78 are radially expanded and connected to these receiving bosses 79 and 80. That is, the boss 7 receives both ends of the coil spring 78.
9, 80 are press-fitted. Still further, if necessary, both ends of the coil spring 78 may be soldered to the receiving bosses 79 and 80 or may be mechanically joined.

According to such a configuration, the outer peripheral surface on the base end side of the contact pin 66 is brought into contact with the inner peripheral surface of the concave portion 77 of the holder 67, and it is not necessary to establish electrical conduction by contact at the contact point. For this reason, it is possible to reliably prevent poor contact due to centrifugal force or minute vibration during high-speed rotation.

As described above, the contact-type connecting device 43 according to the present embodiment includes the contact pins 66 constituting the movable portion.
And a holder 67 constituting a non-movable portion, which is connected by a coil spring 78.
A spring made of phosphor bronze having a small contact resistance and having a gold plated surface,
Both ends of such a spring 78 are received by bosses 79, 8 respectively.
Press-fitting to zero. Therefore, contact pin 6
The contact can be maintained by the coil spring 78 without relying on the surface contact in which the base end portion 6 is pressed against the inner peripheral surface of the concave portion 77 of the holder 67.

According to such a configuration, the twisting due to the temperature change is eliminated, and the tip of the contact pin 66 always contacts the terminal 65 on the lower surface of the head base 19 and the contact pressure of the contact pin 66 against the terminal 65 is reduced. Is kept substantially constant, and poor contact is prevented. Further, in addition to the surface contact between the contact pin 66 and the concave portion 77 of the holder 67, the contact by the spring including the coil spring 78 is added, so that the contact state is doubled, and the contact is further stabilized. Further, the twisting of the wall on the inner peripheral surface of the concave portion 77 of the holder 67 is reduced, so that the durability against repeated use is increased.

Next, another embodiment will be described with reference to FIG. This embodiment is an improvement of the conventional contact-type connecting device shown in FIG. 11 to prevent the occurrence of contact failure due to centrifugal force.

Here, a notch 84 is formed at the base end of the contact pin 66 and at the outer peripheral portion of the portion held in the recess 77 of the holder 67, and a ridge engaged with such a notch 84. 85 is formed on the outer peripheral side of the holder 67. That is, by engaging the protrusions 85 of the holder 67 with the cuts 84 of the contact pins 66, the contact pins 6 in the holder 67 are formed.
6 is prevented from rotating.

The contact pins 66 are slidably held in the holder 67.
The coil spring 78 housed therein is eccentric, whereby a biasing force is applied to the contact pin 66 by the coil spring 78, and the contact point 8
In FIG. 6, the base portion of the contact pin 66 is brought into contact with the inner peripheral surface of the recess 77 of the holder 67.

Such a contact type connection device is mounted on the rotary drum 18 with its axis substantially parallel to the axis of the rotary shaft 24 of the rotary head device shown in FIG. At this time, the notch 84 and the ridge 85 are arranged so that the centrifugal force acts as shown by the arrow F shown in FIG. Contact point 86
, The contact pin 66 comes into contact with the holder 67.

When the coil spring 78 which is eccentric in the opposite direction to the centrifugal force F acts, the centrifugal force F and the bias force accompanying the eccentricity of the spring cancel each other out, so that the contact point 8
The contact force in No. 6 decreases, causing a contact failure. However, such a situation can be prevented by providing a rotation preventing mechanism including the cuts 84 and the ridges 85 and setting the direction correctly.

FIG. 10 shows still another configuration. Here, a coil spring 78 is arranged in the concave portion 77 of the holder 67, and the coil spring 78 presses the inclined surface 88 on the base end side of the contact pin 66. In addition, the notch 84 is formed in the contact pin 66, and the ridge 85 is formed on the holder 67 side, thereby preventing the contact pin 66 from rotating in the holder 67.

Accordingly, by mounting the contact type connecting device on the rotating drum 18 in a state where the rotational position is set so that a centrifugal force as shown by an arrow F in FIG. Portion surely contacts the inner peripheral surface of the concave portion 77 of the holder 67 at the contact point 86, and the contact point 86
Will increase the contact pressure. This makes it possible to prevent poor contact due to centrifugal force.

[0041]

As described above, according to the present invention, the holder having the lead, the contact pin slidably held by the holder, and the contact pin are arranged in the holder, and the tip of the contact pin projects from the holder. And a coil spring for urging the contact pin so that the coil spring is made of a conductor, and one end of the coil spring is connected to the receiving boss such that the receiving boss provided on the holder is diametrically fastened. In addition, the other end of the coil spring is connected to the receiving boss such that the receiving boss provided on the contact pin is diametrically fastened.

Accordingly, the contact pin and the holder are reliably connected by the spring for urging the contact pin, and it is possible to eliminate a connection failure due to a contact failure between the contact pin and the holder.

According to the configuration in which the inner diameter of the coil spring is made smaller than the outer diameter of the receiving boss of the holder and the outer diameter of the receiving boss of the contact pin, the receiving end of the holder is spread while pushing both ends of the coil spring radially outward. By connecting to the boss and the receiving boss of the contact pin, the holder and the contact pin are reliably connected via the coil spring.

According to the configuration in which the coil spring is made of phosphor bronze and the surface thereof is plated with gold,
A more secure connection is achieved with such a coil spring.

Another aspect of the present invention is a holder having a lead, a contact pin slidably held by the holder, and a contact pin disposed in the holder so that the contact pin protrudes from the holder. A biasing coil spring, the coil spring being adapted to apply a biasing force to the contact pin so as to act radially at a predetermined position in the circumferential direction of the housing, and the contact pin is applied to the housing. And rotation preventing means for preventing rotation.

Therefore, by mounting such that the direction of the bias force and the direction of the centrifugal force match, it is possible to prevent poor contact due to the centrifugal force.

According to the configuration in which the bias force is generated by eccentrically mounting the coil spring with respect to the axis, the bias force of the eccentrically mounted spring can be mounted so as not to be canceled by the centrifugal force. Will be possible.

According to the configuration in which the end of the coil spring is received by the inclined receiving surface of the contact and thereby the bias force is generated on the contact pin, the bias force generated by the inclined receiving surface is centrifuged. It will not be canceled by force.

According to the structure in which the coil spring is made of phosphor bronze and the surface thereof is plated with gold, the bias force generated by such a coil spring can be surely contacted without being canceled by centrifugal force. Becomes possible.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the overall configuration of a head drum device.

FIG. 2 is a side view of a head base.

FIG. 3 is a bottom view of the head base.

FIG. 4 is a front view of a contact type connection device for connecting a head base to a printed circuit board.

FIG. 5 is a plan view of a contact type connection device connected by a connection tool.

FIG. 6 is a front view of a contact type connection device connected by a connection tool.

FIG. 7 is a bottom view of the contact type connection device connected by the connection tool.

FIG. 8 is a sectional view showing the internal structure of the contact type connection device.

FIG. 9 is a cross-sectional view showing another configuration of the contact type connection device.

FIG. 10 is a sectional view showing another configuration of the contact type connection device.

FIG. 11 is a longitudinal sectional view showing a use state of a conventional contact type connection device.

FIG. 12 is a longitudinal sectional view showing a use state of another conventional contact type connection device.

[Explanation of symbols]

1 ‥‥ Printed circuit board, 2 ‥‥ Head base, 3 ‥‥ Connection land (terminal), 4 ‥‥ Holder, 5 ‥‥ Lead, 6 ‥
‥ Connection land, 7 ‥‥ Contact pin, 8 ‥‥ Compression coil spring, 9 ‥‥ Contact point, 11 ‥‥ Slope, 16 ‥‥ Mounting bracket, 17 ‥‥ Fixed drum (lower drum),
18 ‥‥ rotating drum (upper drum), 19 ‥‥ head base, 20 ‥‥ screw, 21 ‥‥ magnetic head, 24 ‥‥ rotating shaft, 25, 26 ‥‥ bearing, 27 ‥‥ preload spring, 2
8 ‥‥ motor, 30 ‥‥ boss, 31 ‥‥ rotor yoke,
32 ‥‥ magnet, 33 ‥‥ stator, 34 ‥‥ spacer, 35 ‥‥ printed circuit board, 36 ‥‥ fixing bolt,
40 ‥‥ flange, 41 ‥‥ connection bolt, 42 ‥‥ printed circuit board, 43 ‥‥ contact type connection device, 45 ‥‥ rotary transformer, 46 ‥‥ rotor, 47 ‥‥ stator,
50 ‥‥ mounting seat, 51 ‥‥ printed circuit board, 52 ‥‥ contact type connection device, 53 ‥‥ center spindle, 54
{Relay flange, 55} Cover, 58} Slip ring, 59 # Brush, 60 # Housing, 61
{Connecting member, 65} Terminal (conductive land), 66}
‥ Contact pin, 67 ‥‥ holder, 68 ‥‥ lead,
69 ‥‥ lead insertion hole, 70 ‥‥ connection land, 73 ‥
{Connector, 77} recess, 78} coil spring, 79,
80 ‥‥ receiving boss, 84 ‥‥ cut, 85 ‥‥ ridge, 8
6 ° contact point, 88 ° slope

Claims (7)

[Claims] 1. A holder having a lead; a contact pin slidably held by the holder; and a contact pin disposed in the holder so that a tip end of the contact pin projects from the holder. A coil spring for urging the pin, wherein the coil spring is made of a conductor, and one end of the coil spring is connected to the receiving boss so as to diametrically tighten a receiving boss provided on the holder. A contact type connecting device, wherein the other end of the coil spring is connected to the receiving boss such that the receiving boss provided on the contact pin is diametrically fastened. 2. The contact type connection device according to claim 1, wherein the inner diameter of the coil spring is smaller than the outer diameter of the receiving boss of the holder and the receiving boss of the contact pin. 3. The contact type connection device according to claim 1, wherein said coil spring is made of phosphor bronze, and the surface thereof is plated with gold. 4. A holder having a lead; a contact pin slidably held by the holder; and a contact pin disposed in the holder, such that a tip end of the contact pin projects from the holder. A coil spring for biasing a pin, wherein the coil spring is adapted to apply a biasing force to the contact pin so as to act radially at a predetermined position in a circumferential direction of the housing, and A contact type connection device, comprising: a rotation preventing means for preventing the contact pin from rotating with respect to the housing. 5. The contact type connection device according to claim 4, wherein said bias force is generated by mounting said coil spring eccentrically with respect to an axis. 6. A contact according to claim 4, wherein an end of said coil spring is received by an inclined receiving surface of said contact, thereby generating a biasing force on said contact pin. Type connection device. 7. The contact type connection device according to claim 4, wherein said coil spring is made of phosphor bronze, and the surface thereof is plated with gold.