JPH0731672Y2 - Cartridge mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a cartridge mounting structure.

(Prior Art) Conventionally, in order to attach the cartridge to the tone arm, as shown in FIGS. 7 (a), (b), (c) and (d),
The head shell of the cartridge 30 is mounted on the pair of left and right pedestals 31 protruding from the side surface of the cartridge 30 with screws.
At least four pins 33 fixed to 32 and protruding from a part of the cartridge 30 and four pins 34 provided on the head shell 32 are connected by connecting cords 35, respectively. Insert the boss portion 36 protruding rearward of the head shell 32 in which is attached to the mounting opening 38 provided at the tip of the tone arm 37, and tighten with the tightening screw 39 provided on the outer periphery of the mounting opening 38. Was there.

By this fastening, the output terminal pin 40 provided in the boss portion 36 of the head shell 32 is electrically connected to the terminal 41 provided in the mounting opening 38 of the tone arm 37, and the electric signal of the cartridge 30 is for connection. Pin of head shell 32 from code 35
It was delivered to the terminal 41 of the tone arm 37 via 34, passed through the arm of the tone arm 37, and was connected to the separately provided amplifier via the output cord 42 to generate sound.

On the other hand, in the integrated type cartridge, since the head shell and the cartridge are integrated, the connecting cord for connecting the cartridge and the head shell is not used, but the connection between the tone arm and the integrated type cartridge is not used. In the same manner as described above, the pressure was applied between the output terminal pin on the cartridge side and the terminal on the tone arm side.

(Problems to be solved by the invention) However, in each of the cartridges described above, a contact failure occurs because the electrical signal is delivered by pressure contact between the terminal provided on the tone arm and the output terminal pin provided on the head shell. In addition, since the electric signal from the cartridge is weak, there is a drawback that electrical and magnetic induction is likely to occur and sound quality is impaired.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cartridge mounting structure in which there is no connection failure and no electrical or magnetic induction occurs.

(Means for Solving the Problems) In order to achieve the above object, the cartridge mounting structure of the present invention has a power generation system that integrally converts a signal from a vibration system having a cantilever into an electric signal, A cartridge in which at least a connecting pin portion of the system is provided inside a sill case made of a metal cylinder, a cartridge holder having a contact portion for electrically connecting to the connecting pin of the power generation system, and the cartridge holder is fixed at a predetermined position. And a tone arm provided with an arm portion for inserting the cord from the contact portion, and when the cartridge is mounted in the cartridge holder, the open end side of the shield case surrounds the contact portion of the cartridge holder. It is characterized in that the connection pin and the contact portion are electrically connected by being guided by.

(Operation) In the cartridge mounting structure configured as described above, the vibration system and the power generation system of the cartridge are integrally formed, and the shield case that shields the power generation system is used as a guide to detachably mount the cartridge holder, The contact portion provided on the back side of the cartridge holder fixes the power generation system terminal in the shield case, and the contact portion is fitted into the shield case, so that the connection is ensured, and the cartridge is constructed. Since the holder is fixed to the tone arm, and the cord from the contact portion is inserted through the tone arm, the connected portion is one place of the cartridge and the cartridge holder, and electrical and magnetic induction will be obtained. There are no bad connections.

(Embodiment) An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 6. 1 (a), (b), (c),
(D) is a cartridge, as shown in FIGS. 2 (a), (b),
(C) is a cartridge holder, FIG. 3 (a),
(B) and (c) are contact parts built into the cartridge holder, FIGS. 4 (a), (b), and (c) are main parts of the tone arm, FIG. 5 is an assembly drawing of the cartridge, and FIG. Is a characteristic curve of the cartridge.

In FIG. 1, the main body 2 of the cartridge 1 is a molded product of synthetic resin, and a cantilever 3 is attached to the center of the lower surface shown in (a). A device (not shown) is provided and is configured to generate an electrical signal by movement of the cantilever. The power generator is projected at a rear side of the main body 2 at a predetermined angle, and a shield case 4 made of a metal tube is attached to the periphery of the main body 2 and fixed to the main body 2. The rear end of the shield case 4 is an opening, and a pin serving as a contact piece of the power generator is built in the inside of the opening.

FIG. 2 shows a cartridge holder 5, which is a synthetic resin molded product for detachably attaching the cartridge shown in FIG. The cartridge holder 5 has a cylindrical inclined portion 5a at the center thereof, a truncated pyramid-shaped storage portion 5b extends behind the inclined portion 5a, and the front of the inclined portion 5a is located on the left and right sides. A holding portion 5c formed of a face plate is provided with a step. The slanted portion 5a, the storage portion 5b and the holding portion 5c are provided at their lower ends with a linearly formed protrusion 5d.
5d is a shape that slightly extends to the lower surface side in a state of being extended to the inner side surfaces of the inclined portion 5a, the storage portion 5b, and the holding portion 5c, and two left and right sides are formed in parallel with each other. And this protrusion
The inside surrounded by 5d is an opening. The left and right side surfaces of the inclined portion 5a are the shield case 4 of the cartridge 1.
It is formed so as to contact and hold the side surface of the.

The contact portion 6 is, as shown in FIG. 3, a substantially rectangular main body portion 6a.
And a substantially cubical connecting portion 6b projecting forward thereof, which is integrally formed with a metal thin pipe contact portion 7 and a connecting cord 8 extending from the pipe connecting point 7. Is provided, and the connecting cord 8 is pulled out to the rear of the main body portion 6a. The contact portion 6 is housed in the housing portion 5b of the cartridge holder 5 with the connecting portion 6b facing the insertion direction of the cartridge holder 5, and is bonded by an adhesive. At this time, the connecting portion 6b is provided so as to face the inclined portion 5a side, and is arranged so as to be inserted into the opening of the rear end surface of the shield case 4 of the cartridge 1.

FIG. 4 shows the head portion of the tone arm. The head 9 is a synthetic resin or thin metal formed in a substantially rectangular plate shape, and an arm 10 is provided on the rear side surface at a predetermined angle. Also, the arm of the head 9
Although the finger lifter 11 is provided on the side surface opposite to the side where the 10 is provided, the finger lifter 11 may of course not be provided. In the center of the lower side surface of the head 9, there are provided two groove portions 9a into which the protrusions 5d of the cartridge holder 5 are fitted, and between the two groove portions 9a, the tip portion has an inclined surface with a predetermined angle. The mountain-shaped convex portion 9b having the is provided. The mountain-shaped protrusion 9b is formed at the rear end portion between the groove portions 9a.
A mountain-shaped recess 9c having an inclined surface corresponding to the inclined surface is provided, and a semicircular hole 12 communicating with the mountain-shaped recess 9c and extending into the arm 10 is formed.

A holding portion 9A as shown in FIG. 4 (c) is separately formed at a connecting portion of the head 9 to the arm 10, and the holding portion 9A is attached to the head 9 to attach the holding portion 9A to the arm 10. Is formed into a cylindrical shape. On the back side of the holding portion 9A shown in the drawing, a mountain-shaped concave portion 9c provided on the lower side surface of the head 9 and a concave portion 9Ac corresponding to the semicircular hole 12 are formed.
And a semicircular hole 12a is provided. On the front side of the recess 9Ac, a notch 9Ab for holding the storage portion 5b of the cartridge holder 5 is provided.

The cartridge holder 5, the contact portion 6, and the head 9 configured as described above are assembled as follows. First, an adhesive is applied to the main body portion 6a of the contact portion 6 and attached to the inside of the storage portion 5b of the cartridge holder 5. At this time, the connecting portion 6b of the contact portion 6 is fixed at a predetermined angle facing the front of the cartridge holder 5, and the connecting cord 8 provided behind the contact portion 6 is arranged outside the cartridge holder 5. . Next, an adhesive is applied to the protruding portion 5d of the cartridge holder 5 to which the contact portion 6 is fixed, and the connecting cord 8
Is placed in the semicircular hole 12 of the head 9, and the protruding portion 5d is fitted and attached to the groove 9a of the head 9. Finally, the holding part
The tone arm is completed by adhering to the head 9 around the concave portion of 9A with an adhesive.

If the shield case 4 of the cartridge 1 is inserted into the tone arm head 9 like this, the shield case 4 of the cartridge 1 is smoothly inserted with the inside of the inclined portion 5a of the cartridge holder 5 as a lead. The open end of the shield case 4 has the contact portion 6
Of the power generator of the shield case 4 is fitted and connected in the pipe connecting point 7 in the connecting portion 6b, and the inner surface of the main body portion 2 of the cartridge 1 holds the cartridge holder 5. The part 5c is fitted and assembled as shown in FIG.

As described above, in the cartridge 1, the open end of the shield case 4 is fitted to the connecting portion 6b of the contact portion 6, the pipe connecting point 7 in the connecting portion 6b is fitted to the contact of the power generator, and further, The main body portion 2 of the cartridge 1 does not come off because it has a fitting structure of three places, which is fitted to the holding portion 5c of the cartridge holder 5.

FIG. 6A is a characteristic curve when the cartridge mounting structure of the present invention is used, and FIG. 6B is a characteristic curve when the same cartridge is used for the conventional tone arm. Comparing the two, in the case of (a), the R and L channels are well separated and other characteristics are almost the same, so that the cartridge mounting structure of the present invention can be operated easily and at low cost, It can be seen that the operability is not so good and it is comparable to the expensive one.

(Effect of the Invention) As described in detail above, in the cartridge mounting structure of the present invention, when the cartridge is mounted in the cartridge holder, the open end side of the shield case is guided around the contact portion of the cartridge, The structure that electrically connects the connection pin of the power generation system and the contact part of the cartridge holder enables accurate electrical connection, greatly reduces contact defects, and shields the connection part. Because of the structure,
There is an advantage that the sound quality is stable and the easiness of the operation can be improved without causing magnetic induction.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention, and FIGS. 1 (a), (b), (c) and (d) are cartridges,
(A) is a bottom view, (b) is a side view, (c) is a top view,
(D) is a front view, FIGS. 2 (a), (b), and (c) are cartridge holders, (a) is a side view, (b) is a bottom view, (c) is a front view, and FIG. (A), (b), (c) is a contact part, (a) is a top view, (b) is a side view, (c) is a front view, and FIG. 4 (a), (b), (c) ) Is a head part of the tone arm, (a) is a bottom view, (b) is a side view,
(C) is a top view of the holding portion, FIG. 5 is an assembly drawing of the cartridge, FIGS. 6 (a) and 6 (b) are characteristic curve drawings of the cartridge, and (a) is the mounting structure of the present invention, ( b) the same cartridge attached to a conventional tone arm,
7 (a), (b), (c) and (d) are exploded perspective views of a conventional cartridge. 1 ... Cartridge 4 ... Shield case 5 ... Cartridge holder 6 ... Contact point 9 ... Tone arm head

Claims (1)

[Scope of utility model registration request] 1. A cartridge in which a power generation system for converting a signal from a vibration system having a cantilever into an electric signal is integrally formed, and at least a connecting pin portion of the power generation system is provided inside a sill case made of a metal cylinder, It is composed of a cartridge holder provided with a contact portion for making an electrical connection with the connection pin of the power generation system, and a tone arm provided with an arm portion for fixing the cartridge holder at a predetermined position and inserting a cord from the contact portion. When the cartridge is attached to the cartridge holder, the open end side of the shield case is guided around the contact portion of the cartridge holder to electrically connect the connection pin and the contact portion. cartridge.