JPH0135403B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pick-up cartridge mounting device for making it possible to replace only a pick-up cartridge, and its purpose is to attach a replaceable pick-up cartridge to a tone arm or head shell. To provide a pick-up cartridge mounting device which can be surely and easily mounted to a pick-up cartridge.

In general, tone arms are often pipe-shaped,
An electrical connector for connecting a pick-up cartridge is provided in the circular recess at the tip. Therefore, when installing a replaceable pick-up cartridge at the tip of the tone arm, the pick-up cartridge is inserted into the circular recess at the tip of the tone arm at the rear end and electrically connected to the internal electrical connector. It is provided integrally with the headshell having the plug to be connected and is replaceable,
The pickup cartridge is usually attached by tightening an annular lock nut provided at the tip of the tone arm.

On the other hand, considering the replaceable pick-up cartridge itself, if the pick-up cartridge part and head shell part are integrated as described above, the head shell part must also be replaced when replacing the pick-up cartridge. Therefore, the head shell portion has an impact on the cost, which poses a problem of increasing the economic burden on the user. From this point of view, the pick-up cartridge is now configured to be detachable from the headshell, and the headshell is either pre-installed integrally at the tip of the tonearm, or is detachably attached to the tip of the tonearm using the above-mentioned lock nut. The headshell itself is now being used as an accessory.
The above-mentioned pick-up cartridge is usually detachably attached to the lower surface of a plate-shaped head shell by tightening two mounting screws from the upper surface of the head shell. However, in this mounting structure of the pick-up cartridge to the head shell, the mounting state of the pick-up cartridge to the head shell is unstable depending on the degree of tightening of the two mounting screws, and the verticality of the needle tip of the pick-up cartridge cannot be maintained accurately. There was a problem that it was difficult to take it. In other words, the two mounting screws mentioned above are tightened in symmetrical positions across the center axis of the pick-up cartridge, but if they are tightened to different degrees to the head shell, they will move left and right around the center axis, causing wobbling. There is a risk that abnormal resonance may occur due to the needle tip, and there are also problems such as the tip of the needle being installed with a deviation below the center axis and losing verticality.

The present invention provides a pick-up cartridge mounting device that eliminates such conventional drawbacks, and the present invention will be described below with reference to drawings of embodiments.

1 and 2 show an embodiment of the pick-up cartridge mounting device of the present invention, in which 1
is a pick-up cartridge, and 2 is a head shell. The pick-up cartridge 1 has a box-shaped main body 3, and a needle tip guard 4 is provided on the distal end surface of the main body 3 to protect a needle tip 6 at the tip of a cantilever 5. This needle tip guard 4 is provided with a vertical slit, through which the needle tip 6 can be seen. A plug protrusion 7 made of a non-conductive material and having a substantially rectangular cross section is provided on the rear end surface of the box-shaped main body 3, and penetrates in the horizontal direction, that is, in the direction parallel to the record to be played. A recess 8 is provided so as to. and,
A pair of output terminals 9a, 9b and 10a, 10b are provided at the rear end of the plug protrusion 7 partitioned by the recess 8, respectively. Here, as shown in FIG. 3, the rectangular plug protrusion 7 has side surfaces that are approximately parallel to the horizontal direction and tapered side surfaces that are inclined to move away from each other toward the bottom in the vertical direction. In other words, it has a trapezoidal cross section. The head shell 2 has a recess 11 on its tip surface into which the rear end of the box-shaped main body 3 of the pick-up cartridge 1 is fitted, and the rectangular plug protrusion 7 of the pick-up cartridge 1 is located within the recess 11.
A rectangular recess 12 into which is fitted is provided.
The rectangular recess 12 corresponds to the plug protrusion 7.
Correspondingly, it is more accurately trapezoidal. That is, the recess 12 has four walls 13 surrounding it.
a, 13b, 13c, and 13d, and the left and right walls 13a, 13b are inclined to follow the tapered side surface of the plug protrusion 7. The four walls 13a, 13b, which constitute the recess 12,
A slit 14 is provided in one of the walls 13c and 13d in the vertical direction (in this example, the lower wall 13c) in the axial direction of the head shell 2, and by the action of this slit, the horizontal direction The left and right walls 13a and 13b facing each other are slightly elastic. Further, although not shown in the square recess 12, an electrical connector is arranged having terminals to which the output terminals 9a, 9b and 10a, 10b of the square plug protrusion 7 are connected,
The end surface of the electrical connector is the rectangular recess 12.
It forms the bottom of the. In addition, the rectangular recess 12
Among the walls 13a to 13d that surround the left and right walls 13a and 13b that face each other in the horizontal direction, mounting screws 15 are installed.
A hole (not shown) is provided into which the mounting screw 15 is tightened, and a recess 16 into which the head 15a of the mounting screw 15 is inserted is provided on the surface of one wall 13a. The mounting screw 15 has a shaft portion 15b integral with the head portion 15a, and the shaft portion 15b
A threaded portion 15c having a diameter larger than that of the lower neck portion 15d is provided only at the tip. A circular plug 17 is attached to the rear end of the head shell 2, and although the circular plug 17 is not shown, it is fitted onto the tip of a known tone arm and tightened with a lock nut. There is. Further, the head shell 2 is provided with a finger hook 18 for raising and lowering the pick-up cartridge cartridge 1 relative to the record disc.

In the pick-up cartridge mounting device having such a configuration, the pick-up cartridge 1 press-fits the rectangular plug protrusion 7 provided at the rear end of the main body 3 into the rectangular recess 12 provided at the tip of the head shell 2. By fitting the rear end of the main body 3 into the recess 11 provided at the tip of the head shell 2, the output terminals 9a, 9b and 10a, 10b provided on the plug protrusion 7 can be connected to the electrical terminal provided in the recess 12. By connecting to the connector and further tightening the mounting screw 15 into the hole provided in the head shell 2, the left and right walls 13a, 13b of the head shell 2 are drawn together, and the pick-up cartridge 1 is attached to the head shell 2. . At this time, the mounting screw 15 which traverses the inside of the recess 12 is in the recess 8 of the plug protrusion 7 fitted into the recess 12.

As in this embodiment, the plug protrusion 7 and the recess 12
By making both of them trapezoidal, it is possible to reliably prevent upside-down insertion. In addition, the three surfaces of the plug protrusion 7 are in the recess 1.
In this state, the left and right walls 13a and 13b are evenly drawn together by the mounting screws 15 to tightly press both the left and right sides of the plug protrusion 7, so that the cartridge 1 is placed in the head shell. 2, it can be installed without tilting in any direction, up, down, left, or right. Of course, unnecessary resonance can be reliably prevented by tightening the mounting screws 15. In addition, the output terminals 9a, 9b of the cartridge 1,
10a and 10b are directly pressed against the electrical connector in the head shell 2, so there is no chance of connection errors, such as when connecting terminals at the ends of four separate lead wires to the four output terminals of the cartridge one by one. There is no risk of this happening.

In the above embodiment, the pick-up cartridge 1
horizontal recess 8 in square plug protrusion 7
This is a depression 8 as shown in Figure 4.
Even if the pickup cartridge 1 is provided with a wall 19 and a through hole 20 formed therein, the pickup cartridge 1 can be similarly attached to the head shell 2 using the attachment screws 15.

5 and 6 show another embodiment of the present invention, in which 21 is a head shell and 22 is a socket for attaching the pick-up cartridge 1 to the head shell 21. The headshell 21 has a plate-shaped portion 23 at its tip to which the socket 22 is attached, and a circular plug 24 at its rear end which is fitted into a known tone arm and secured by tightening with a lock nut. The plate-shaped portion 23 has elongated holes 26a and 2 into which mounting screws 25a and 25b for mounting the socket 22 are inserted.
6b is provided. The socket 22 has a tapered concave surface 27 into which the tapered upper surface of the pick-up cartridge 1 enters.
It has screw holes 28a, 28b in which the mounting screws 25a, 25b are tightened. Further, behind the tapered concave surface 27 is a concave portion 2 into which the plug protrusion 7 of the pick-up cartridge 1 enters.
9 is provided. The recess 29 has left and right walls 30a and 30b facing each other, and holes 32 and 33 into which the mounting screws 31 are inserted are provided in the walls 30a and 30b, and the outer surface of the wall 30a is provided with holes 32 and 33, into which the mounting screws 31 are inserted. A bottom portion 34 is provided into which the head portion 31a of the mounting screw 31 is inserted. The threaded portion 31c at the tip of the shaft portion 31b of the mounting screw 31 has a diameter larger than that of the lower neck portion 31d, and once tightened, it becomes difficult to come off from the wall 30a.

In the pick-up cartridge mounting device having such a structure, the socket 22 is fastened to the head shell 21 by the mounting screws 25a and 25b, and the pick-up cartridge 1 is fastened to the socket 22 by the mounting screws 31. Fixed. In this case, the pick-up cartridge 1 is replaced by simply tightening or loosening the mounting screw 31. That is, when replacing the pick-up cartridge 1, the mounting screw 31 must be inserted into the wall 30.
The plug does not come out from a, and the plug protrusion 7
is located in the recess 29. However, since the plug protrusion 7 of the pick-up cartridge 1 is provided with a recess 8 whose rear ends on both sides are open, the tip of the mounting screw 31 is inserted into this part. The pick-up cartridge 1 can be removed by simply pulling it out without being obstructed by the mounting screws 31.

In addition, each output terminal 9 at the rear end of the plug protrusion 7
The above plug 2 is attached to a, 9b and 10a, 10b.
The terminals 36 at the tips of the lead wires 35 connected to the terminals 4 are connected by fitting.

7 and 8 show still another embodiment of the present invention, in which reference numeral 41 is a tone arm, into which a plug protrusion 7 provided at the rear end of the pickup cartridge 1 is press-fitted. rectangular recess 42
is provided. This rectangular recess 42 connects the tone arm body 43, which has a U-shaped cross section, and the electrical connector 4.
4 is attached to the plate body 45. The left and right walls 46 forming the rectangular recess 42
Holes 47 into which mounting screws 47 are inserted are provided in a and 46b.
b, 47b are provided, and one other wall 4
An axial slit 48 is provided in 6c.

In the pick-up cartridge mounting device having such a configuration, the plug protrusion 7 of the pick-up cartridge 1 is press-fitted into the rectangular recess 42 at the tip of the tone arm 41, thereby attaching the electrical connector provided in the rectangular recess 42. The output terminals 9a, 9b and 10a, 10b are inserted into and connected to the tone arm 41.
Attach the mounting screws 47 to the holes 47b, 47b provided at the tips of the
By tightening, the left and right walls 46a and 46b at the tip of the tone arm 41 can be tightened together to mount the pickup cartridge 1.

As described above, according to the present invention, a plug protrusion having a substantially rectangular cross section provided at the rear end of a pick-up cartridge is replaced with a plug protrusion having at least elasticity provided on a mounting body such as a tone arm, head shell, socket, etc. The pick-up cartridge can be installed simply by press-fitting it into a recess surrounded by three walls, including one wall, passing through the recess or through-hole provided in the left and right walls of the recess and the plug protrusion, and tightening one mounting screw. Because it can be mounted, the pick-up cartridge can be mounted with a simple configuration and with good verticality without centering.Also, by tightening the mounting screws, the left and right walls facing each other that form the rectangular recess are elastically deformed, making them strong. This has advantages such as easy installation and no abnormal resonance.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an embodiment of the pick-up cartridge mounting device of the present invention, Fig. 2 is an exploded perspective view thereof, and Figs. 3 a, b, and c are front views of the pick-up cartridge used in the device. , left side view,
4 is a perspective view showing another example of the pick-up cartridge mounting device used in the same device, FIG. 5 is a perspective view showing another example of the pick-up cartridge mounting device of the present invention, and FIG. Its exploded perspective view,
FIG. 7 is a perspective view showing still another embodiment of the pick-up cartridge of the present invention, and FIG. 8 is an exploded perspective view thereof. 1... Pick-up cart cartridge, 7... Square plug protrusion, 8... Hollow, 19... Wall, 20
...Through hole, 2,21...Hetsudoshiel, 22...
Socket, 41...Tone arm, 12, 29,
42...Square recess, 15, 31, 47...Mounting screw.

Claims (1)

[Scope of Claims] 1. A plug protrusion having a substantially rectangular cross section at the rear end, an output terminal protruding from the rear surface of the plug protrusion, and extending perpendicularly to the axial direction of the plug protrusion. a pick-up cartridge having a recess or through hole that horizontally penetrates the plug protrusion;
a mounting body having a recess surrounded by at least three walls including left and right walls facing each other in the horizontal direction made of an elastic material, and a plug protrusion of the pick-up cartridge is inserted into the recess of the mounting body. The pick-up cartridge is configured to be press-fitted into the recess, pass through the left and right walls of the recess and the recess or through hole of the plug protrusion, and tighten a mounting screw, thereby deforming the left and right walls and attaching the pick-up cartridge to the mounting body. A pick-up cart cartridge mounting device. 2. The pick-up cartridge mounting device according to claim 1, characterized in that a tone arm is used as the mounting body. 3. The pick-up cartridge mounting device according to claim 1, wherein a head shell provided at the tip of the tone arm is used as the mounting body. 4. The pickup cartridge mounting device according to claim 1, wherein a socket provided in a head shell at the tip of the tone arm is used as the mounting body. 5. Claims 2 or 3, characterized in that an electrical connector is provided in the recess of the mounting body to which an output terminal on the rear surface of the plug protrusion provided at the rear end of the pick-up cartridge is connected. Pick-up cart cartridge mounting device. 6. The pick-up cartridge mounting device according to claim 1, wherein the left and right side walls of the plug protrusion and the left and right walls constituting the recess of the mounting body are both slightly inclined.