JPS6030853Y2 - recording card - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a recording card used in a recording card insertion type recording/reproducing machine.

As shown in Fig. 1, the recording card insertion type recording/playback device has a card insertion slot 1 on the top surface, and when a recording card 2 is inserted through the insertion slot 1, the sound reproduced is emitted from the speaker 3, and the sound is played back. When the button 4 is pressed after , the recording card 2 is ejected to the upper part.

The recording card 2 shown in FIG. 2 has its front side shown in figure a, on which visual information such as letters and pictures are recorded, and figure b is a longitudinal cross-sectional view, where numeral 24 denotes a recording disk, and 23 denotes a recess for card retraction. It shows.

Figure 0 shows the back side, and the spiral center P of the recording disk 24 is set to be located at distances A and B from the outer edges 21 and 22 of the card, respectively.

On the other hand, in FIG. 3, showing the main parts of the recording car lower alignment device and the playback device, the positioning board 11 has a recess 11b surrounded on three sides by slightly protruding edges 11a, and a large recess in the center. A circular hole 11c is formed, a pot-shaped cylindrical portion 12 is fitted into the circular hole 11c, and a bearing 13 is fitted into the center of the bottom portion 12a of the cylindrical portion 12.

A shaft 14 is rotatably supported by the bearing 13, a pulley 15 is fixed to one end, and a turntable 16 is fixed to the other end.

A belt that transmits rotation from a drive source (not shown) is hooked around the pulley 15, and the turntable 15 is attached with a mechanism in which a sensing element (not shown) moves itself in the radial direction while rotating with the rotation of the table.

When the recording card 2 is inserted as shown by the chain line, the leading edge 22 of the card abuts against the second abutting part 19 by a locking mechanism (not shown) in the card retraction recess, and the side edge 21 is held by the spring member 18. is abutted against the first abutment part 17, the spiral center P of the recording disk formed on the back of the card is
It is configured to coincide with the center of the scanning spiral of the sensing element provided on the turntable.

That is, from the first abutment part 17 to the second abutment part 19
．． The center of the turntable is set at a distance B from 19.

If audio is played from a stationary recording card by scanning a sensitive element such as a magnetic head or a record stylus in a spiral, the center of the spiral of the audio track recorded on the recording disc and the spiral of the scanning sensitive element If the centers do not match, the sound recorded at the time of sound generation cannot be faithfully reproduced, resulting in so-called wow and flutter.

For example, if the center deviation reaches ±0.1 mm and an A6 size recording card is used, the rotation fluctuation rate will be 0.2 to 0.1 mm.
It has been theoretically confirmed that it will be 5%.

Therefore, the dimensions A and 8 from the outer edges 21 and 22 of the spiral center of the recording disk attached to the recording card are required to be as accurate as possible.

However, the conventional method of recording cards is to attach a plastic record to a mount, but
With this method, it is difficult to adhere the recording disc to the mount with high precision in both A size and 8 size.

In order to overcome the drawbacks of this method, a method has been proposed in which the positioning hole of the recording card is engaged with the positioning pin of the card insertion part when the recording card is set in the player, but the structure of the player is complicated and impractical.

Next, a small record disc in which the recording disc and the mount are integrally formed has been proposed, but if the card is made of a material suitable for the recording disc, such as vinyl chloride, it will be deformed by heat during pressing. This caused difficulty in maintaining the accuracy of dimensions A and 8.

The present invention provides a recording card in which, when the recording card is set in the player, the center of rotation of a turntable provided with a sensitive element in the player easily coincides with the center of the spiral of the recording track of the recording card. With the goal.

This purpose is to create a recording disc that includes a mount provided with a positioning part at a predetermined distance from the leading edge and one side edge, and a retaining part that engages with the positioning part provided at the center of a spiral audio track. A person is distantly related by a card consisting of.

The present invention will be explained in detail below using illustrated embodiments.

FIG. 4a is a plan view showing an embodiment of the present invention, the same figure is a sectional view, and FIG. 5 is an exploded perspective view.

In these figures, reference numeral 20 indicates a mount, reference numeral 24 indicates a recording disc, and reference numeral 25 indicates a printing sheet.

The mount 20 is, for example, a board of the size of an A6 plate, made of a material with little elasticity, such as plastic containing glass fiber, and has a circular shape with an inner diameter edge 20b slightly larger than the outer diameter edge 24a of the recording disc 24 at the center of the mount 20. A recessed portion 20c is formed.

A circular protrusion 26 (positioning portion) having a diameter of 5wIt, for example, is formed at the center of the recess 20c.

The plane of the mount 20 and the top surface of the projection 26 are at approximately the same height.

The center of this circular protrusion 26 is set to be exactly A dimension from the outer edge 21 and 8 dimensions from the outer edge 22.

Reference numeral 23 indicates a recess for drawing in the mount 20 for abutting against the card matching device.

The center of the spiral audio track recorded on the recording disc 24 has a hole 27 (
The recording disk 24 has the above-mentioned hole 27.
is fitted into the protrusion 26 and adhered to the recess 20c with an adhesive.

On the other hand, a printed sheet 25 on which visual information such as letters and pictures is printed is pasted on the back side of the mount 20.

With this structure, when a recording card is set on the board 11 of the card matching device with the printed sheet 25 facing up in the figure in FIG.
At the same time, the A dimension, 8th dimension) coincides with the center position of the recording disk of the recording card (A dimension, 8th dimension).

Therefore, it is possible to easily obtain sound with uniform sound quality without rotational fluctuations and at a low cost.

Moreover, the outer diameter edge 20b of the circular recess 20c is larger than the outer diameter class 24a of the recording disc accommodated and stuck in this recess, and the gap G
Therefore, even if the recording disk 24 expands and contracts to some extent due to changes in external temperature and humidity, no distortion occurs and there is no fear that the center point will shift.

It is preferable to use a non-drying adhesive to apply the adhesive between the mount 20 and the recording disc 24, since this further increases reliability.

The manufacturing method for Recording Disc 24 is no different from that of conventional Sonosheets.

If the sensing element of the playback device is a needle, the audio track of the recording disc will consist of sound grooves, and if the former is a magnetic head, the latter will consist of magnetic tracks.

Also, the printing sheet 25 is not absolutely necessary, but the mount 2
0 may be directly printed or two packages may be molded.

Another embodiment, which differs only in the engaging portion from the embodiment described above, is shown in FIG. 6, only in the retaining portion.

That is, in this case, the center of the circular recess 20c of the mount 20 forms a recess 26 instead of a protrusion, and the center of the recording disc 24 forms a protrusion 27 instead of a hole.

The inner diameter of the recess 26 is set to be equal to or slightly larger than the outer diameter of the protrusion 27.

Furthermore, although the engaging portions were circular in all of the embodiments, it is also possible to eliminate the need for adhesive by using non-circular engaging portions that complement each other.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of a recording/playing device with a recording card inserted, Fig. 2a is a front view of the recording card, Fig. 3 is a vertical sectional view thereof, Fig. C is a back view thereof, Fig. 3 4A is a plan view and a cross-sectional view showing the recording card matching device, FIG. 4A is a plan view showing an embodiment of the present invention, and FIG. , FIG. 6 is a sectional view showing an engaging portion of another embodiment of the present invention. 2... Recording card, 20... Mount, 2
4...Recording disc, 25...Printed sheet,
26... Positioning part, 27... Engaging part.

Claims (1)

[Scope of utility model registration request] It consists of a mount having a positioning part at a predetermined distance from the leading edge and one side edge, and a recording board having an engaging part that engages with the positioning part at the center of a spiral audio track. A recording card characterized in that the engaging part of the recording disc is engaged with the positioning part of the mount and joined to each other.