JP7177565B1 - playback device - Google Patents

Abstract

An object of the present invention is to realize stable reproduction of sound with high sound quality. A reproducing apparatus for reproducing sound recorded on a record, comprising a rotating part for rotating the record, a container disposed near the rotating part and capable of containing liquid, powder or gel, Equipped with a float for floating on the liquid, powder or gel contained in the container, an arm extending from the float in the direction of the rotating part, and a phono cartridge having a sound reproducing needle attached to the arm. playback device. [Selection diagram] Fig. 1

Description

The present invention relates to playback devices.

In the above technical field, Patent Document 1 discloses a reproducing apparatus in which a float 6 is floated on water in a container 5 provided on one side of a vinyl 11, and a tone arm 1 is attached to the float 6. (Fig. 4).

Patent Document 2 discloses a reproducing apparatus in which a float 14 is floated on a fluid in one container 10 provided above a record disc 16, and a tone arm 26 is attached to the float (Figs. 1 and 2). ).

Russian Patent No. 2463675 U.S. Patent 3,235,267

However, in the technique described in the above document, when a phono cartridge stylus receives periodic force from the phono cartridge when a phono cartridge with large eccentricity or warping is played back, the posture of the phono cartridge is not stable.

An object of the present invention is to provide a technique for solving the above problems.

To achieve the above object, the device according to the present invention comprises:
A playback device for playing back audio recorded on a record,
a rotating part that rotates the record board;
a container disposed near the rotating part and capable of containing a liquid, powder or gel;
a float for floating on the liquid, powder or gel contained in the container;
an arm extending from the float toward the rotating part;
a phono cartridge having a sound reproduction needle attached to the arm;
a guide mechanism that guides the force received by the sound reproducing needle from the sound groove provided on the record;
A playback device comprising
The guide mechanism includes at least two contact portions provided on sidewalls of the float .

According to the present invention, it is possible to realize stable reproduction of sound with high sound quality.

1 is a diagram showing the configuration of a playback device according to a first embodiment; FIG. FIG. 11 is a perspective view showing the configuration of a playback device according to a second embodiment; FIG. 10 is a plan view showing the operation of the playback device according to the second embodiment; FIG. 10 is a cross-sectional view showing the operation of the playback device according to the second embodiment; FIG. 12 is a diagram showing the configuration of a playback device according to a third embodiment; FIG. FIG. 12 is a diagram showing the configuration of a playback device according to a third embodiment; FIG. FIG. 12 is a diagram showing the configuration of a playback device according to a third embodiment; FIG. FIG. 11 is a diagram for explaining merits of the playback device according to the third embodiment;

BEST MODE FOR CARRYING OUT THE INVENTION Exemplary embodiments of the present invention will be described in detail below with reference to the drawings. However, the components described in the following embodiments are merely examples, and the technical scope of the present invention is not limited to them.

[First embodiment]
A playback device 100 as a first embodiment of the present invention will be described with reference to FIG. The playback device 100 is a playback device that plays back audio recorded on a record disc 110 .

As shown in FIG. 1, the playback device 100 includes a rotating portion 101, a container 102, a float 103, an arm 104, and a phono cartridge 105. FIG.

The rotating section 101 rotates the record board 110 .

The container 102 is arranged near the rotating part 101 and can contain liquid, powder or gel.

Float 103 is for floating on a liquid, powder or gel contained within container 102 .

The arm 104 extends from the float 103 toward the rotating portion 101 .

The phono cartridge 105 is attached to the arm 104 and has a sound reproducing needle 151 .

According to the above configuration, even if the record disc 110 is eccentric or warped, the phono cartridge 105 can keep the stylus pressure constant without significantly changing its posture, and thus provides a high-quality sound reproduction device. can.

[Second embodiment]
Next, a playback device according to a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a perspective view for explaining the outline of the playback device 200. As shown in FIG.

A playback device 200 for playing back sounds recorded on a record disc includes a rotating portion 201 , a container 202 , a float 203 , an arm 204 and a phono cartridge 205 .

The rotating section 201 rotates the record board 210 .

The container 202 is arranged near the rotating part 201 and can contain liquid, powder or gel.

Float 203 is for floating on a liquid, powder or gel contained within container 202 .

The arm 204 is rod-shaped and extends from the float 203 toward the rotating portion 201 .

The phono cartridge 205 is attached to one end of the arm 204 and has a sound reproducing needle 251 .

The arm 204 is made of steel or the like having high rigidity and vibration absorption so as not to be deformed by the load applied to itself or the load transmitted from the needle of the phono cartridge 205 .

The rotating section 201 includes a so-called turntable, and has a rotation driving function for rotating the record 210 clockwise. The rotating part 201 has a center spindle 211 as a central axis of rotation.

In the present embodiment, the rotating part 201 has, for example, a flat plate shape that looks like a square from above.

The container 202 is a rectangular parallelepiped and arranged along a side surface forming one side of the rotating part 201 .

The rotating part 201 and the container 202 are fixed to a flat base 209 .

The rotating part 201 functions as a turntable for rotating the record board 210 on the base 209 .

The container 202 is made of a material such as resin, metal, glass, or pottery, for example. The container 202 now contains a liquid 220, for example water. The float 203 floats on a fluid such as liquid, powder or gel contained within the container 202 . By selecting the fluid in the container 202 from substances other than water, the mass and viscosity coefficient can be adjusted.

The float 203 is, for example, a columnar member having a circular or elliptical cross section and is rotatable. The float 203 is made of a material having a smaller specific gravity than the fluid contained in the container 204, such as expanded polystyrene or wood.

The other end of the arm 204 passes through the float 203 and has a counterweight 241 fixed thereto.

Arm 204 preferably intersects the pivot axis of float 203 inside float 203 . This is because such crossing makes the center of gravity of the combined object of the arm 204, the phono cartridge 205 and the counterweight 241 and the center of gravity of the combined object of the float 203, the hollow shaft 231 and the rings 232, 233 stably coincide with each other. This is because it becomes possible. Therefore, even if the angle formed by the arm axis and the horizontal plane changes when following the warp of the record, the moment of the force around the R-axis applied to the levitation unit is balanced. Specifically, the moment of force acting on the phono cartridge 205 side of the center of gravity of the floating unit and the moment of force acting on the counterweight 241 side of the center of gravity of the floating unit are balanced. As a result, the stylus pressure does not change significantly, so the warping of the record does not have a large effect on the sound quality. For example, if the stylus pressure is 0.02N, the arm length is 200mm, and the amount of warpage of the record is 1.5mm, the total mass of the arm, phono cartridge, and counterweight is 150g. In order to keep the distance below, it is desirable to keep the distance (deviation) between the intersecting arm axis and the rotation axis within about 4 mm.

The counterweight 241 has a function of adjusting the stylus pressure, has a cylindrical shape or the like, and is made of a material having a high specific gravity such as copper or lead.

The arm 204 is in the shape of an elongated round bar or square bar, and is arranged so that a vertical line extending from the tip of the sound reproducing needle 251 to the rotation axis of the center spindle 211 is orthogonal to the axis of the arm 204 at the twisted position. An audio reproduction needle 251 is arranged.

Also, the moving direction (R-axis direction) of the float 203 is arranged parallel to the straight line connecting the sound reproducing needle 251 and the center spindle 211 .

Arm 204 is preferably arranged to pass through the center of the length of float 203 in the direction of movement. It is desirable that the float 203 have a shape (for example, a cylinder) symmetrical with respect to a plane that passes through the center of the length in the moving direction and is perpendicular to the R-axis.

The float 203 is rotatable about an axis R parallel to the tracking direction T of the phono cartridge 205 .

Two rectangular parallelepiped struts 291 and 292 are fixed to the base 209 , and a rod-shaped shaft 293 is fixed in the R-axis direction between the struts 291 and 292 . It is preferable to adjust the position and attitude of the shaft 293 so that it is coaxial with the R axis.

Both the struts 291 and 292 and the shaft 293 are made of a highly rigid material such as steel. Furthermore, it is desirable to coat the surface of the shaft 293 with a material such as a fluorine resin having a coefficient of friction of 0.1 or less.

On the other hand, a cylindrical hollow shaft 231 is fixed to the float 203 so as to pass through the float 203 concentrically with the R-axis. The hollow shaft 231 is made of a highly rigid steel material, like the arm.

Two rings 232 and 233 concentric with the hollow shaft 231 are fixed to both ends of the hollow shaft 231 . Rings 232 and 233 function as slides that guide the movement of float 203 in the axial direction. Therefore, it is desirable that the rings 232 and 233 be made of a material having a coefficient of friction of 0.1 or less, such as fluororesin.

The shaft 293 is supported by the struts 291 and 292 while being inserted into the rings 232 , 233 .

As a result, the levitation unit consisting of the float 203 and the parts fixed thereto (the arm 204, the counterweight 241, the phono cartridge 205, the sound reproduction needle 251, the hollow shaft 231, the rings 232, 233) is integrated into the R Rotate around an axis.

The level of liquid 220 is adjusted to a position where no vertical force acts between rings 232 , 233 and shaft 293 . That is, the water level of the fluid or the like 220 is adjusted so that the rings 232 and 233 and the shaft 293 are coaxial.

Supports 291 , 292 , shaft 293 , hollow shaft 231 and rings 232 , 233 function as a guide mechanism that guides the force received by sound reproducing needle 251 from the sound grooves provided on record disc 210 . The guide mechanism receives the force F2 in the peripheral speed direction that the levitation unit receives from the contact point of the record disc 210 at the tip of the sound reproducing needle 251, and causes the sound reproducing needle 271 to linearly move in the direction of the center spindle 211. guide.

The phono cartridge 205 has a sound reproduction needle 251 for reading the unevenness formed in the sound groove of the record disc 210 and converting it into an electric signal, and a power generating mechanism (not shown).

Many records have a maximum eccentricity of about 2 mm due to manufacturing errors. can be followed, and deterioration of sound quality can be suppressed.

On the other hand, many records have a maximum warp of about 3 mm due to manufacturing errors and deformation over time. In this case, as the warped record 210 rotates, the vertical position of the contact point between the sound reproducing needle 251 and the upper surface of the record 210 changes periodically. Since the arm 204 is supported by the rotatable float 203, the change in the force applied to the sound reproducing needle 251 is minimized, and the sound reproducing needle 271 is able to respond to changes in the vertical position of the point of contact with the record disc 210. can be followed (Fig. 4).

As a result, the postures of the phono cartridge 205 and the sound reproducing needle 251 can be stabilized. As a result, the sound reproducing needle 251 can purely detect the unevenness of the sound groove of the record disc 201 .

Since the float 203 fixed (or connected) to the arm 204 rotates while floating on the liquid 220, it absorbs the vertical rocking caused by the warp of the record, thereby suppressing adverse effects on the sound quality.

The weight and position of the counterweight 241 can be adjusted so that the force (so-called stylus pressure) applied to the record disc 210 by the sound reproducing stylus 251 is within a predetermined range (for example, 0.001 to 0.01N).

As shown in FIG. 3, the sound reproducing needle 251 moves from the outer periphery of the record 210 toward the center (toward the center spindle 211) along the groove of the record 210 rotating on the rotating portion 201. As shown in FIG.

Accompanying the movement of the sound reproducing needle 251, the arm 204 also moves while maintaining its posture (while maintaining the angle formed with the R axis at a right angle).

Conversely, the lengths L1 and L2 of the container 202 and the float 203 are set so that the sound reproducing needle 251 can move from the outermost circumference of the record disc 210 to the center spindle 211. FIG.

The weight of the levitation unit (99.0 to 99.9%) excluding the force applied to the record disc 210 by the sound reproducing stylus 251 in the direction perpendicular to the record rotation surface (so-called stylus pressure) is can be supported by the buoyant force received from the liquid 220 . As a result, when the float 203 moves, it receives only a small resistance from the liquid 220 and can move very smoothly.

Therefore, the sound reproducing needle 251 moves linearly toward the center spindle 211 in a very stable manner due to the force in the direction of the center spindle 211 received from the grooves of the rotating record disc 210 .

In this embodiment, the levitation unit, in which the phono cartridge 205, arm 204, float 203, and counterweight 241 are integrally fixed (or connected), is supported by buoyancy, and can swing in both the vertical direction and the tracking direction. Because of the tracking, increasing the total weight of the levitation unit only slightly increases the resistance to tracking. Therefore, the total weight of the levitation unit can be increased.

When the total weight of the structure supporting the phono cartridge 205 is increased, the posture of the phono cartridge 205 is stabilized by inertia, and the sound reproduction needle 251 can faithfully convert the unevenness of the sound groove of the record 210 into a music signal.

Since the floating unit floats on the liquid 220 , the stylus 251 attempts to move in the R-axis direction due to the frictional force received from the record disc 210 . At that time, the force F2 is also received in the peripheral speed direction of the record rotation (direction perpendicular to the R axis), but due to the contact points between the rings 232 and 233 and the shaft 293, the movement of the levitation unit in the direction of the rotating part 201 and the vertical axis Rotation around is limited, and it translates in the R-axis direction. In other words, the levitation unit functions as a linear tracking guide for the sound reproduction stylus 251 .

When the record 210 rotates, the position of the point of contact between the tip of the sound reproducing needle 251 and the record 210 periodically changes in the tracking direction T due to the eccentricity of the record 210 . The levitation unit follows this periodic change in position while maintaining its posture while floating in liquid or the like. In other words, the levitation unit functions as a linear tracking guide even when the position of the sound reproducing stylus 251 changes periodically due to the eccentricity of the record disc 210 .

[Third Embodiment]
Next, a playback device 500 according to a third embodiment of the present invention will be explained using FIG. FIG. 5 is a diagram for explaining the configuration of a playback device 500 according to this embodiment. The playback device 500 according to the present embodiment differs from the second embodiment in the configuration for restricting the float drive. Since other configurations and operations are similar to those of the second embodiment, the same configurations and operations are denoted by the same reference numerals, and detailed description thereof will be omitted.

When the eccentricity of the record 210 is large, such as 1 mm or more, the entire floating unit swings greatly as the record 210 rotates (FIG. 6).

To solve this problem, instead of the rings 232, 233, etc. of the second embodiment, a contact portion 532, a shaft 593 for contacting the contact portion 532, and a shaft 593 rigidly fixed to the base 509 are provided. Members 591 and 592 are provided for this purpose. The shaft 593 is cylindrical, for example.

The contact portion 532 is fixed at the center of the entire length of the float 503 in the R-axis direction. The tip of the contact portion 532 has a sharp shape so as to make point contact with the shaft 593 .

With respect to the eccentricity of the record disc 210, the entire levitation unit rotates about the tip of the contact portion 532 (FIG. 6). As a result, the moment received by the stylus due to the eccentricity of the record 210 can be released, and the side force (force in the tracking direction T received by the sound reproducing stylus 251 from the sound groove of the record) that adversely affects the sound quality can be reduced. can.

Assuming that the eccentricity is ±1.5 mm and the arm length is about 200 mm, the change in angle is within ±0.5°, and the effect on the sound quality is considered to be negligible.

Leaf springs 531 and 533 are provided on the surface of the float 503 on the rotating portion 201 side so as to sandwich the contact portion 532 in the R-axis direction. By bringing the leaf springs 531 and 533 into contact with the shaft 593 , the center of rotation of the floating unit in the vertical direction can be adjusted to be the tip of the contact portion 532 .

If the spring constants of the plate springs 531 and 533 are too large, the contact portion 532 will separate from the shaft 593 as it swings, which will adversely affect the sound quality. Therefore, it is necessary to set the spring constant of the leaf spring to be sufficiently small. The spring constant of the leaf springs 531 and 533 is a value, for example, 0.001 to 0.005 N/cm, at which the tip of the contact portion 532 is easily bent to a position where it contacts the shaft 592 due to the force F2 applied to the tip of the sound reproducing needle 251. do.

The contact portion 532 , the leaf springs 531 and 533 and the shaft 593 function as a guide mechanism that guides the force that the sound reproducing needle 251 receives from the sound groove provided on the record disc 210 . That is, the guide mechanism includes at least two contact portions provided on the sidewalls of the float 203 and contacting the shaft 593 .

The surfaces of the contact portion 532, the plate springs 531 and 533, and the shaft 593 in contact with each other are preferably coated with a material having a friction coefficient of less than 0.1, such as fluororesin. The contact portion 532 is provided between leaf springs 531 and 533 as contact portions. The leaf springs 531 and 533 have greater elasticity (lower elastic modulus) than the contact portion 532 . The contact portion 532 is desirably made of a material having a large longitudinal elastic modulus (high rigidity) such that the deformation due to the force F2 is as small as possible, for example, 0.1 μm or less.

As shown in FIG. 7, it is desirable that the contact portion 532 is a part of a cylindrical shape when viewed from the R-axis direction. When the record disc rotates and when the float 503 periodically rotates due to the warp of the record disc 210, the tip of the contact portion 532 contacts the shaft 593 so that the contact position of the contact portion 532 with the shaft 593 does not change. The part is shaped along an arc with the R axis as the center.

In the above embodiments, the floats 103, 203, 503 are rotatable. Advantages thereof will be described with reference to FIG.

As shown in FIG. 8, if the float has a rotatable shape such as a cylindrical shape, a cylindrical shape, or a conical shape, the stylus pressure of the sound reproducing stylus 251 on the record disc 210 is substantially constant against the warp of the record disc. can be followed as is.

The float is not limited to one. A plurality of floats may be joined with a rigid body and used. By using two floats separated in the R-axis direction, a stable arrangement can be achieved.

To adjust the vertical position of the music playing needle 251, an external tank with a pump may be provided to supply and drain the fluid 220 from the container 202. FIG.

[Other embodiments]
Although the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the technical scope of the present invention.

Claims (5)

A playback device for playing back audio recorded on a record,
a rotating part that rotates the record board;
a container disposed near the rotating part and capable of containing a liquid, powder or gel;
a float for floating on the liquid, powder or gel contained in the container;
an arm extending from the float toward the rotating part;
a phono cartridge having a sound reproduction needle attached to the arm;
a guide mechanism that guides the force received by the sound reproducing needle from the sound groove provided on the record;
A playback device comprising
The reproducing device , wherein the guide mechanism includes at least two contact portions provided on the sidewalls of the float . 2. A reproducing apparatus according to claim 1, wherein said float is rotatable about an axis parallel to the tracking direction of said phono cartridge. 3. The reproducing device according to claim 2, wherein the float has a shape of a body of revolution. 2. The reproducing apparatus according to claim 1, further comprising a guide mechanism for guiding a force received by said sound reproducing stylus from a sound groove provided on said record disc. the contact portion includes first, second and third contact portions provided on the side walls of the float;
2. The reproducing apparatus according to claim 1, wherein said first and third contact portions provided by narrowing said second contact portion have an elastic modulus smaller than that of said second contact portion.

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