JPS6396760A - Magnet recording and reproducing device - Google Patents

Abstract

PURPOSE:To miniaturize a device, by providing an electrical contact which connects a detecting means and a recording and reproducing means, and makes the same state as the electrical signal detecting state of the detecting means representing a state impossible to record at a time of removing a holding part, between the holding part and a box cabinet. CONSTITUTION:The electrical contact 7 is provided between the holding part 10 and the box cabinet 11, and the electrical contact 7 is closed by mounting the holding part 10 on the box cabinet 11, and a light emitting element 1 and a light receiving element 6 are connected to a circuit in the inside of the box cabinet 11 electrically, and adversely, when the holding part 10 is removed from the box cabinet 11, the electrical contact 7 is opened. Therefore, since the electrical contact 7 is opened, and no input to an electrical signal detector 8 exists when the holding part 10 is removed from the box cabinet, no erasing current is permitted to flow on an erasing head, and as a result, no recording operation can be performed. In such a way, it is possible to surely prevent erroneous erasure from occurring with simple constitution, and to obtain a magnetic recording and reproducing device small in size and light in weight, and not regulated by the size of a cassette tape.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic recording/reproducing apparatus equipped with a device for detecting the presence or absence of a recess or hole in a detected portion of a tape cassette.

Conventional technology As a conventional technology, for example, Japanese Utility Model Publication No. 52-3569
There is an accidental erasure prevention device as shown in Publication No. 2.

The conventional accidental erasure prevention device described above will be described below with reference to the drawings.

FIGS. 3 and 4 are operational diagrams of a conventional erroneous erasure prevention device. In Figures 3 and 4, 21 is a tape cassette;
The tape cassette 21 has a tab 22 for preventing accidental erasure.

Reference numeral 23 designates a detection lever for the tape cassette 21. The detection lever 23 is integrally provided with a detection protrusion 24 that engages with the erroneous erasure prevention claw 22, and is rotatably supported by a shaft 25. It is rotated counterclockwise around the center. Reference numeral 27 is a stop pin that restricts the rotational position of the detection lever 23. The operating lever 28 has an arm 29 that comes into contact with the bottom of the inserted tape cassette 21 and is rotatably supported by the shaft 25.
It is urged to rotate counterclockwise with reference to . 31 is a switch, and the switch 31 is arranged so as to face the side surface of the detection lever 23.

The operation of the accidental erasure prevention device configured as above will be described below.

When the tape cassette 21 is installed in a predetermined position, the detection lever 23 is rotated clockwise about the shaft 25, and the detection protrusion 24 is brought into a state where it faces and engages with the erroneous erasure prevention claw 22. At this time, if the accidental erasure prevention tab 22 is present,
As shown in FIG.
2, the detection lever 23 is kept almost vertically and does not reach the point where the switch 21 is actuated.
If the tab 22 for preventing accidental erasure is not present because it is notched,
As shown in FIG. 4, the detection protrusion 24
Since the detection lever 23 is further rotated clockwise, the switch 31 is activated to open the erasing head circuit, thereby preventing the tape cassette 21 from being erroneously erased. The accidental erasure prevention device and tape cassette configured as described above are housed in a box.

Problems to be Solved by the Invention However, with the above configuration, there is a problem that the size of the magnetic recording/reproducing device is limited by the size of the tape cassette, making it impossible to miniaturize and making it inconvenient to carry. Ta.

In view of the above problems, the present invention makes it possible to further downsize the tape cassette by configuring a part of the tape cassette to be exposed from the box, making the box smaller, and configuring the grip of the box to be detachable. The present invention provides a magnetic recording/reproducing device.

Means for Solving the Problems In order to solve the above-mentioned problems, the magnetic recording and reproducing apparatus of the present invention includes a box body for storing the tape cassette in a state where the detected portion of the tape cassette is exposed; The apparatus includes: a covered recording/reproducing means; a detecting means for detecting the presence or absence of a recess or a hole in the detected part as an electrical detection signal; and a box gripping means that supports the detecting means and is detachable from the box. , the detecting means and the recording/reproducing means are electrically coupled to each other, and an electric contact is connected to the gripping portion such that when the gripping portion is removed, the state of the electric detection signal of the sensing means is the same as that of the sensing means indicating a non-recordable state. It is arranged between the boxes.

Effect of the Invention The present invention has the above-described configuration, and can detect the presence or absence of a recess or a hole in the detection area of a tape cassette with a simple configuration without having to store all the tape cassettes in a box as in the conventional case, and can also detect the presence or absence of a recess or hole in the detection target part of a tape cassette, and can also detect the presence or absence of a recess or hole in the detected part of a tape cassette, without having to store all the tape cassettes in a box as in the conventional case. Even if the part is configured to be removable from the box, it can easily and reliably prevent accidental erasure.
This makes it possible to realize a lightweight magnetic recording/reproducing device.

Embodiment Below, a magnetic recording and reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an erroneous erasure prevention device used in a magnetic recording and reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a specific configuration diagram of a magnetic recording and reproducing apparatus equipped with an erroneous erasure prevention device.

In FIGS. 1 and 2, 1 is a light emitting element that projects infrared light for detection. 2 is a first converging lens that converges the detection infrared light projected from the light emitting element 1; 3 is a tape cassette; the tape cassette 3 has a tab 4 for preventing accidental erasure. 5 is a second converging lens that converges the detection infrared light reflected by the erroneous erasure prevention claw 4; 6 is a second converging lens 5;
The light receiving element 6 receives the infrared detection light converged by the detection infrared light, converts it into an electrical signal, and outputs it. The output electrical signal becomes stronger or weaker depending on the position of the reflected detection infrared light on the surface of the light receiving element 6. Reference numeral 7 denotes an electrical contact configured between the grip portion 10 and the box body 11.

8 is an electric signal detector for detecting the electric signal output from the light receiving element 6; 9 is an erase head circuit for preventing erroneous erasure of the tape cassette 3; 13 is a magnetic recording and reproducing device; 10
is a grip portion of the magnetic recording/reproducing device 13.

This gripping part 10 is configured to be detachable from the box body with screws 12, and there is an electrical contact 7 between the gripping part 10 and the box body 11. 7 is closed, and the light emitting elements 1.7 are closed. The light receiving element 6 is electrically coupled to a circuit inside the box 11, and the electrical contact 7 is opened when the grip 10 is removed from the box.

The operation of the accidental erasure prevention device configured as above will be described below with reference to FIGS. 1 and 2.

1 and 2, when the tape cassette 3 is installed in the magnetic recording/reproducing device, the light emitting element 1 projects infrared light for detection. After passing through the first converging lens 2 and reaching the accidental erasure prevention claw 4, it is reflected and passes through the second converging lens 5 to the light receiving element 6.
incident on .

At this time, if the tape cassette 3 does not have a notch in the erroneous erasure prevention claw 4 (that is, the tape cassette is recordable), the detection infrared light reflected by the erroneous erasure prevention claw 4 is reflected on the surface of the light receiving element 6. Adjust the incident position to the position shown by the dashed line in FIG. 1, where the electric signal output from the light receiving element 6 is strongest. For cassettes that you do not want to erase), the incident position of the reflected infrared light for detection on the surface of the light receiving element 6 changes as shown by the broken line in Figure 1, and the electrical signal output from the light receiving element 6 is weak. Become.

Therefore, depending on the strength of the electrical signal output by the light receiving element 6, it is possible to determine whether the erroneous erasure prevention tab 4 of the tape cassette 3 is cut out or not.

When the accidental erasure prevention claw 4 is not cut out, that is, when the electrical signal output from the light receiving element 6 is strong, the electrical signal detector 8 can detect this electrical signal and close the erasing head circuit 9. The signal can be recorded on a magnetic tape (not shown) in the tape cassette 3.

Further, when the accidental erasure prevention claw 4 is notched, that is, when the electrical signal output from the light receiving element 6 is weak, the electrical signal detector 8 cannot detect this electrical signal, and the erasing head circuit 9 is opened to prevent erroneous erasure of the magnetic tape (not shown) in the tape cassette 3.

If the grip portion 10 is removed, the electrical contact 7 is opened and there is no input to the electrical signal detector 8, so that no erasing current flows to the erasing head, making the recording operation impossible.

As described above, according to the present embodiment, there is a box body that houses the tape cassette with the detected part of the tape cassette exposed, a recording/reproducing means covered by the box body, and a recess or a part of the detected part of the tape cassette. A detection means for detecting the presence or absence of a hole as an electric detection signal, and a gripping means that supports the detection means and is removable from the box, the detection means and the recording/reproducing means are electrically coupled, and the As shown in FIG. 2, by providing an electrical contact between the gripping portion and the box body so that the state of the electric detection signal of the detection means is the same as that of the detecting means indicating an unrecordable state when the gripping portion is removed, the tape A simple configuration such as storing the cassette in a manner that protrudes from the outside of the magnetic recording/reproducing device and incorporating a light-emitting element and a light-receiving element into the removable gripping part can reliably prevent accidental erasure. A small, lightweight magnetic recording and reproducing device that is free from restrictions can be realized.

Although this embodiment has been described as an erroneous erasure prevention device in which the detected portion of the tape cassette is a erroneous erasure prevention claw, it is obvious that the present invention is not limited to this.

Effects of the Invention As described above, the present invention provides a box for storing a tape cassette with the detected portion of the tape cassette exposed, a recording/reproducing means covered by the box, and a recess or a recess in the detected portion. A detection means for detecting the presence or absence of a hole as an electric detection signal, and a gripping means that supports the detection means and is removable from the box, the detection means and the recording/reproducing means are electrically coupled, and the By providing an electrical contact between the gripping portion and the box body so that when the gripping portion is removed, the state of the electric detection signal of the detection means is the same as that of the detection means indicating a non-recordable state, the tape cassette can be placed in the box as in the past. It can detect the presence or absence of a recess or hole in the detected part with a simple configuration without having to store it all inside the body, and even if the grip part is removed and there is no detection part, it can reliably prevent erroneous erasure, and it can prevent magnetic recording. This leads to smaller, lighter weight and improved reliability of playback equipment.

Note that although the above description has been made using an infrared light type detection device, it is obvious that the present invention is not limited to this.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an erroneous erasure prevention device according to an embodiment of the present invention, FIG. Figures 1 and 4 are operation diagrams of a conventional accidental erasure prevention device. 1...Light emitting element, 2...First converging lens, 3...Tape cassette , 4...
Accidental erasure prevention claw, 5...Second converging lens,
6... Light receiving element, 8... Electric signal detector, 9... Erase Rad circuit, 7... Electric contact, 10...・Gripping part, 11... Box body. Name of agent Patent attorney Toshio Nakao and 1 other person @2 Figure 3 Figure 4

Claims (1)

[Claims] a box housing a tape cassette with a detected portion of the tape cassette having a magnetic tape exposed therein;
A recording/reproducing means covered by the box body for recording and reproducing signals on the magnetic tape, and presence/absence of a recess or a hole in the detected portion for detecting whether or not signals can be recorded on the magnetic tape. a detection means for detecting as an electrical detection signal; and a box gripping means that supports the detection means and is detachable from the box; the detection means and the recording/reproducing means are electrically coupled; A magnetic recording/reproducing device characterized in that an electrical contact is provided between the gripping portion and the box body so that the state of the electric detection signal of the detecting means is the same as that of the detecting means when the gripping portion is removed.