JPH10149600A - Cassette tape recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cassette tape recording and reproducing device capable of effectively suppressing a communication efficiency from being lowered by an induced current. SOLUTION: When a cassette stuck with a cassette tag in which an antenna and a memory IC are involved is set, a communication is performed between the antenna of a device side and the antenna of the cassette tag via the hole 21 formed in a compartment 13, a cassette controller side plate 14 and a slide plate 17. The hole 21 is constituted of a square hole 21a and strip shaped projecting parts 21b, 21c. Then, the path of an induced current to be generated in surroundings of the hole 21 is expanded by the existings of the projecting part 21b, 21c and it is effectively suppressed that a magnetic flux for communication is weakened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape recorder recording / reproducing apparatus, and more particularly to a cassette tape recording / reproducing apparatus for recording / reproducing a cassette tape to which a cassette tag containing an IC for transmitting / receiving data in a non-contact manner is adhered. Related to the device.

[0002]

2. Description of the Related Art There is a demand for recording and storing video data which is photographed by an image pickup device such as a television camera and recorded on a video tape in such a manner that information such as its contents can be easily confirmed. . Especially,
In the case of a television broadcast station used for news gathering, a necessary cut is quickly selected from a large number of cuts (consecutively shot images or video data) shot by a video camcorder or the like. Need to be edited.

Until now, usually, such information of recorded video data is recorded in a separate memo at the time of shooting, and at the time of reproduction or editing, desired video data is selected at a high speed while viewing the memo. Such a method is used. In recent years, in a quarter-inch digital video cassette tape or the like, a semiconductor memory element such as a flash memory is incorporated in a cassette for accommodating a video tape so that information such as recording time, recorded content, and title can be recorded. There is also.

However, recording and reproduction of data with respect to the semiconductor memory device incorporated in such a video cassette tape is provided, for example, near the erroneous erasure prevention claw on the back of the cassette case, and ground, power, clock, It is performed by a contact method through four electrodes of data, and therefore, there are some disadvantages. First, an electrode of a device for recording and reproducing data must be brought into proper contact with the electrode, and if the positioning is not performed accurately, data cannot be recorded / reproduced properly. Was. In addition, there has been a problem that a contact failure is caused by the adhesion of dust or the like, and data cannot be recorded / reproduced properly. In any case, the contact that transfers the data is a contact method,
There is a problem in that there is a limit to repeated use, that is, it is weak and the reliability is not sufficient.

[0005] For a material to be newly recorded from now on, the use of such a video cassette tape makes it easy to confirm the contents and the like. It cannot be applied to a huge amount of video tape cassettes such as hundreds of thousands in television broadcasting stations,
Such information cannot be stored in an electronic state.

In order to solve such a problem, index information is stored in a non-contact memory IC that transmits and receives data in a non-contact manner, and a cassette tag (cassette back cover) including the non-contact memory IC is used. It is conceivable to attach it to a video cassette. With this configuration, the index information of the video cassette can be accurately read using, for example, a portable reading device, and the content can be easily confirmed. By the way, there is a demand that the index information stored in the non-contact memory IC should be read similarly when the video cassette is inserted into the recording / reproducing apparatus. Here, data transmission / reception between the non-contact memory IC and the recording / reproducing device is performed by detecting a magnetic field generated from the transmitting antenna on the receiving side.

[0007]

In order to transmit and receive data between the non-contact memory IC and the recording / reproducing apparatus as described above, an antenna of a cassette tag attached to an inserted video cassette and the recording / reproducing apparatus are used. It is necessary that the antenna of the device be located opposite to the antenna. By the way, in the recording / reproducing device, a metal plate may be interposed between the antenna of the cassette tag adhered to the video cassette and the antenna of the recording / reproducing device due to the arrangement of other components. In such a case, a hole is provided in the metal plate, and communication is performed through the hole. This metal plate is indispensable for the structure of the recording / reproducing device. However, when communication is performed via such a hole provided in the metal plate, there is a problem that the magnetic flux generated from the antenna of the cassette tag is weakened by the induced current generated in the metal plate. That is, when the number of magnetic fluxes passing through the hole provided in the metal plate changes, an electromotive force is induced around the hole of the metal plate by the electromagnetic induction effect. In this case, since the induced electromotive force is generated in a direction that hinders a change in magnetic flux around the hole, the reception efficiency is reduced. That is,
Magnetic flux from the antenna of the non-contact memory IC increases (decreases)
In this case, a magnetic flux generated by the induced current due to the induced electromotive force is generated in a direction opposite to the magnetic flux, and the increase (decrease) of the magnetic flux from the antenna of the non-contact memory IC is suppressed.

This will be described with reference to the drawings.
As shown in FIG. 7, a metal plate 2 is interposed between an antenna substrate 1 and a cassette tag 3 of the recording / reproducing apparatus. A wound antenna 10 is included near the center of the cassette tag 3, and a memory IC 4 is included at one end. A hole 7 is provided in the metal plate 2 at a position facing the antenna substrate 1. When the cassette is inserted into the recording / reproducing device, the hole 7
The winding antenna 10 and the antenna substrate 1 face each other via the. With the cassette inserted in the recording / reproducing apparatus, a magnetic flux 6 is generated by the current 5 flowing through the winding antenna provided on the antenna substrate 1, and the magnetic flux 6 is transmitted through the hole 7 of the metal plate 2 to the cassette tag. 3 passes through the third winding antenna 10. As a result, a current corresponding to the magnetic flux 6 flows through the winding antenna 10, and the current is detected by the memory IC 4.

At this time, an induced current 9 is generated around the hole 7 of the metal plate 2 in the illustrated direction. This induced current 9 is applied in a direction to cancel the change of the magnetic flux 6 shown in FIG.
As shown in FIG. 8, a magnetic flux 8 is generated by the induced current.
Thereby, the change of the magnetic flux 6 from the antenna substrate 1 shown in FIG. 7 is suppressed, and the receiving efficiency is reduced. In order to suppress such a decrease in reception efficiency, the diameter of the hole provided in the metal plate is increased to weaken the magnetic flux due to the induced current, or the notch 22 is formed as shown in FIG. Although a method of cutting off is conceivable, there is a limit in the strength and structure of the metal plate, and the magnetic flux due to the induced current cannot be sufficiently weakened. There is also a method of increasing the amount of current flowing to the antenna of the antenna substrate 1, but a new problem such as an increase in power consumption occurs.

[0010] Similar to this, as shown in FIG.
This also occurs when the antenna substrate 1 is arranged between the cassette tag 3 and the metal plate 2. In this case, as shown in FIG. 9, the magnetic flux 6 generated from the antenna substrate 1 causes
An induced current 9 is generated around the hole 7 to generate a magnetic flux in a direction to cancel the change of the magnetic flux 6.

The present invention has been made in view of the above-mentioned conventional technology, and suppresses a decrease in communication efficiency between an antenna provided on a cassette tag and an antenna of a recording / reproducing apparatus due to an induced current generated in a metal plate. It is an object of the present invention to provide a cassette tape recording / reproducing apparatus which can perform the recording.

[0012]

In order to solve the above-mentioned problems of the prior art and achieve the above-mentioned object, a cassette tape recording / reproducing apparatus of the present invention comprises a first antenna and a data processing unit. A cassette tape recording / reproducing apparatus for recording / reproducing a cassette tape provided with a cassette tag, wherein the cassette tape is attached to the cassette tape when the cassette tape is set at a position where recording / reproduction is performed. A second antenna facing the first antenna, data processing means for processing data received by the second antenna from the first antenna, and a cassette tape set at a position where recording and reproduction are performed; A protruding portion interposed between the cassette tape and the second antenna and provided at a position corresponding to the second antenna to expand a path of an induced current; And a metal plate having a hole for communication with the is formed.

At this time, the communication hole formed in the metal plate has, for example, a shape in which a stripe-shaped protrusion is provided on at least one side of a polygon.

In the cassette tape recording / reproducing apparatus according to the present invention, the communication hole formed in the metal plate is provided with the stripe-shaped protrusion, so that the hole having no such protrusion is formed. In comparison, the path of the induced current generated around the hole can be enlarged, and the suppression of the change in the magnetic flux for communication by the induced current can be effectively suppressed. Also, the protruding portion is, for example, a stripe shape,
Even if such a protrusion exists, the metal plate can have sufficient strength.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cassette tape recording / reproducing apparatus according to an embodiment of the present invention will be described below. FIG.
2 is a front view of the cassette tape recording / reproducing apparatus 20 of the present embodiment, FIG. 2 is a side view of the cassette tape recording / reproducing apparatus 20 shown in FIG. 1 when a cassette is inserted, and FIG. 3 is a cassette tape recording / reproducing apparatus shown in FIG. FIG. 4 is a side view of the apparatus 20 when a cassette is down. In the cassette tape recording / reproducing apparatus 20, the antenna substrate 1 is provided at a position facing the cassette tag 3 adhered to the cassette 12, with the cassette 12 inserted and set at a position where recording / reproduction is performed. At this time, between the cassette tag 3 and the antenna board 1, a compartment 13, a cassette side plate 14, and a slide plate 17 are arranged in this order. As shown in FIG. 6, the cassette tag 3 has a configuration in which an antenna 10 having a spiral pattern is included near the center of a striped double-sided adhesive sheet, and a memory IC 4 is included at one end.

The antenna substrate 1 is fixed to a substrate shield case, and an R (Read) / W (Write) substrate 16
And a flexible cable. In addition, the cassette tape recording / reproducing device 20 includes a data processing unit that processes data received by the antenna of the antenna substrate 1. Compartment 13, Cascon side plate 1
Holes 21 having a shape as shown in FIG. 4 are formed in the slide plate 4 and the slide plate 17 at positions facing the antenna substrate 1. Through the hole 21, the antenna 1 of the cassette tag 3
0 and the antenna provided on the antenna substrate 1 perform communication through a magnetic flux. As shown in FIG. 4, the hole 21 is formed with a stripe-shaped protrusion 21 in a square hole 21a.
b, 21c.

In the cassette tape recording / reproducing apparatus 20,
A hole 21 formed in the compartment 13, the cassette side plate 14, and the slide plate 17 is formed in the protrusion 2 as shown in FIG.
By providing the shape provided with 1b and 21c, the eddy diameter of the induced current generated around the hole by the magnetic flux for communication is increased as compared with the case of using a square hole as shown in FIG.
The magnetic flux due to the induced current can be weakened. for that reason,
It can be effectively suppressed that the magnetic flux for communication is weakened by the magnetic flux due to the induced current. The hole 21 is
Striped holes 21b and 21c are formed in square holes 21a.
, The striped holes 21b, 2b
1c, the compartment 13, the cascon side plate 14
Also, the strength of the slide plate 17 is not significantly reduced, and these can have sufficient strength.

Hereinafter, a cassette tape recording / reproducing apparatus 20
Will be described. In the cassette tape recording / reproducing apparatus 20, as shown in FIG.
Is inserted into the cassette 12. Then, manually,
When the arm plate 18 is rotated, the slide plate 17 slides along the groove, and in conjunction with this movement, the compartment 13 moves to the down position (down position) shown in FIG. At this time, the slide plate 17 is locked by the lock plate 19, and the compartment 13 is fixed. When taking out (EJECT) the cassette 12, the lock by the lock plate 19 is released, and the operation reverse to that at the time of insertion is performed.

When the cassette 12 to which the cassette tag 3 including the memory IC is adhered is placed at the down position shown in FIG. 3 by the above-described operation, the antenna of the cassette tag 3 and the antenna substrate 1 are moved to the compartment 13,
They face each other through the holes 21 of the cassette 14 and the slide plate 17. Then, the magnetic flux for communication emitted from the antenna 10 of the cassette tag 3 is received as a change in current by the antenna of the antenna substrate 1 through the hole 21, and based on the change in current, a reading process or the like is performed in the data processing unit. Is performed.

The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the case where the hole 21 having the shape shown in FIG. 4 is formed in the compartment 13, the cassette side plate 14, and the slide plate 17 as a metal plate is illustrated. Holes 31 and 32 having a shape as shown in FIG. 6 may be formed. The hole 31 shown in FIG. 5 is an elongated striped hole 31 at one end of a pair of opposed sides of a square hole 31a.
b, 31c. By doing so, the path of the induced current 33 is expanded as shown in FIG. 5, and it is possible to effectively suppress the magnetic flux for communication from being weakened by the magnetic flux due to the induced current. In addition, the holes 32 shown in FIG. 6 are elongated strip-shaped holes 32b, 32c, 32d, and 32e at one end of each side of the square hole 32a.
It has a shape with. By doing so, the path of the induced current 34 is expanded as shown in FIG. 6, and the magnetic flux for communication can be effectively suppressed from being weakened by the magnetic flux due to the induced current. The communication hole formed in the metal plate may have, for example, at least one of a triangular shape or a rectangular shape and a stripe-shaped protrusion.

The cassette tape recording / reproducing apparatus of the present invention is applied not only to a device for performing both recording and reproducing of a cassette tape, but also to a device exclusively for reproducing a cassette tape and a device exclusively for recording a cassette tape. You.

[0022]

As described above, according to the cassette tape recording / reproducing apparatus of the present invention, the diameter of the vortex of the induced current generated around the hole by the magnetic flux for communication is expanded, and the magnetic flux due to the induced current is weakened. Can be. Therefore, it can be effectively suppressed that the magnetic flux for communication is weakened by the magnetic flux due to the induced current. Further, according to the cassette tape recording / reproducing apparatus of the present invention, it is possible to give sufficient strength to the metal plate on which the communication hole is formed.

[Brief description of the drawings]

FIG. 1 is a front view of a cassette tape recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a side view of the cassette tape recording / reproducing apparatus shown in FIG. 1 when a cassette is inserted.

FIG. 3 is a side view of the cassette tape recording / reproducing apparatus shown in FIG. 1 when the cassette is down.

FIG. 4 is a view for explaining shapes of communication holes formed in a compartment, a cassette side plate, and a slide plate of the cassette tape recording / reproducing apparatus shown in FIG. 1;

FIG. 5 is a view for explaining other shapes of communication holes formed in the compartment, the cassette side plate, and the slide plate of the cassette tape recording / reproducing apparatus shown in FIG. 1;

FIG. 6 is a view for explaining other shapes of communication holes formed in the compartment, the cassette side plate, and the slide plate of the cassette tape recording / reproducing apparatus shown in FIG. 1;

FIG. 7 is a diagram for explaining a problem that occurs when communication is performed between the winding antenna provided on the cassette tag and the antenna of the cassette tape recording / reproducing apparatus.

FIG. 8 is a diagram for explaining a problem that occurs when communication is performed between a winding antenna provided on a cassette tag and an antenna of a cassette tape recording / reproducing apparatus.

FIG. 9 is a diagram for explaining a problem that occurs when communication is performed between a winding antenna provided on a cassette tag and an antenna of a cassette tape recording / reproducing apparatus.

FIG. 10 is a diagram for explaining a problem that occurs when communication is performed between a winding antenna provided on a cassette tag and an antenna of a cassette tape recording / reproducing apparatus.

[Description of Signs] 1 ... antenna board, 13 ... cassette tag, 12 ... cassette, 13 ... compartment, 14 ... casset side plate, 1
5: Board shield case, 16: R / W board, 17: Slide plate, 18: Arm plate, 19: Lock plate, 20: Cassette tape recording / reproducing device, 21, 21a, 21b,
21c ... hole

Claims (3)

[Claims] 1. A cassette tape recording / reproducing apparatus for recording / reproducing a cassette tape with a cassette tag provided with a first antenna and a data processing section, wherein the cassette tape performs recording / reproduction. A second antenna facing the first antenna attached to the cassette tape when set in the cassette tape; and a data processing means for processing data received by the second antenna from the first antenna. When the cassette tape is set at a position where recording / reproduction is performed, the path of the induced current is interposed between the cassette tape and the second antenna and located at a position corresponding to the second antenna. A cassette tape recording / reproducing apparatus comprising: a metal plate having a communication hole provided with a protruding portion that expands. 2. The cassette tape recording / reproducing apparatus according to claim 1, wherein said metal plate is a partition plate. 3. The cassette tape recording / reproducing apparatus according to claim 1, wherein the communication hole formed in the metal plate has a shape in which a stripe-shaped protrusion is provided on at least one side of a polygon. .