JPS60117438A - Magnetic picture recording device - Google Patents

Abstract

PURPOSE:To prevent erroneous picture recording where another signal is recorded in duplication on a magnetic tape where a signal is already recorded, by constituting a device so that a tape cassette is ejected when rewinding of the magnetic tape is completed. CONSTITUTION:The device is so constituted that a control circuit 19 is operated on a basis of not only the signal from an eject switch 18 but also the signal from a control means 14. When a magnetic tape 2 is rewound and its end part is detected by an end part detecting means 12, the control means 14 stops driving a supply reel driving means 15 and a take-up reel driving means and gives the signal to the control circuit 19. The control circuit 19 operates an ejecting means 20 on a basis of this signal to eject a tape cassette 1. Thus, signals are not recorded erroneously on the magnetic tape 2 even if the time of reserved picture recording comes again and the signal from a program switch 17 is outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to improvements in magnetic recording devices, and particularly relates to improvements in magnetic recording devices equipped with a scheduled recording function that automatically starts recording at a predetermined set time. .

[Prior Art] FIG. 1 is a plan view showing a schematic configuration of a magnetic tape bus system in a conventional magnetic recording apparatus. In the figure, 1 is a tape cassette, 2 is a magnetic tape installed and stored in the tape cassette 1, and 6 and 7 are supply reels and winders for holding the ends of the magnetic tape 2 and winding the magnetic tape 2, respectively. It is a special rule. The supply reel 6 and the take-up reel 7 are connected to supply reel drive means and take-up reel drive means, not shown, respectively. Reference numeral 5 denotes a head drum rotatably provided on the travel path of the magnetic tape 2. A pair of heads 3 and 4 for recording video signals are attached to the circumferential surface of the head drum 5 at positions separated from each other by, for example, 180 rJ. moreover,
A capstan 8 and a pinch roller 9 are provided in connection with the traveling path of the magnetic tee 12 to keep the traveling speed of the magnetic tape 2 constant.

Head drum5. The rotational drives of the supply reel 6, the take-up reel 7° capstan 8, and the pinch roller 9 are controlled by a control means to be described later.

FIG. 2 is a block diagram showing the circuit configuration of a conventional magnetic recording device. In the figure, 10 is a 1pli image signal source, and a video signal from the video signal source is given to an output circuit 11. The output circuit 11 is controlled by the control means 14 and supplies video signals to the heads 3 and 4 to record the video signals on the magnetic tape 2 (FIG. 1). The supply reel drive means 15 drives the supply reel 6 (FIG. 1), and the take-up reel drive means 16 drives the take-up reel 7 (FIG. 1). Both the supply reel drive means 15 and the take-up reel drive means 16 are controlled by the control means 14.

The end detection means 12 detects both ends of the magnetic tape 2. The end detection means 12 can be configured, for example, by means for detecting changes in the output torques of the supply reel drive means 15 and the take-up reel drive means 16. This is because, for example, the supply reel driving means 15 is connected to the supply reel 6.
When the magnetic tape 2 is wound onto the supply reel 6 side and the magnetic tape 2 cannot be wound any further,
The output torque of the supply reel driving means 15 changes.

By detecting this change, it is possible to detect that the magnetic tape 2 has been wound onto the supply wheel 6 side, in other words, one end of the magnetic tape 2 can be detected. The same applies when detecting the torque of the take-up reel drive means 16. The edge detection means 12 also includes:
It can also be configured by a light projecting element and a light receiving element. Both ends of the magnetic tape 2 are often attached to a supply reel or take-up reel 7 via, for example, a transparent film. Therefore, if the light emitting element and the light receiving element are arranged on the path of the magnetic tape 2 at positions separated by the magnetic tape 2, the magnetic tape 2 can be wound onto the supply reel 6 or the take-up reel 7. When this occurs, the transparent film portion connected to the end of the magnetic tape 2 appears, so that light from the light projecting element to the light receiving element is not blocked, and the end of the magnetic tape 2 can be detected.

The mode selection switch 13 is a switch for selecting a mode such as recording mode or rewind mode. Furthermore, when the magnetic recording device is provided with a playback function, a playback mode can also be selected.

17 is a program switch. The program switch 17 has a timekeeping function and can further set a predetermined set time. Then, at the set time, a signal is given to the control means 14 to cause so-called scheduled recording to be performed.

The eject switch 18 is the attached tape cassette 1.
(Fig. 1) gives a signal for taking out the sample. The control circuit 19 drives the sweeping means 20 based on the signal from the eject switch 18. The offering means 20 changes the tape cassette 1 from the installed state to a state where it can be taken out.

In the conventional magnetic recording apparatus configured as described above, operations are performed as follows. The operation will be explained with reference to FIG. 1 as well. For example, when the recording mode is selected by the mode selection switch 13, the control means 14 drives the supply reel 159, the reel 16 that winds up the supply reel 159, and the output circuit 11. The video signal generated from the video signal source 10 is modulated by the output circuit 11, and is modulated by the head drum 5 (
tape 2 by heads 3 and 4 attached to
recorded above. At this time, the tape 2 is run at a constant speed by the reels 6.7, the capstan 8, the pinch row 59, etc. driven by the respective reel drive means 15.16.

6- Furthermore, if a predetermined time is set using the program switch 17, an output is generated from the program switch 17 and given to the control means 14 when the set time comes. In response, the control means 14 controls the output circuit 11, each reel drive means 15, 16, etc., to automatically record the video signal on the tape 2, in the same way as when the above-mentioned recording mode is selected.

In the recording mode, when the magnetic tape 2 on the supply reel 6 side reaches the end, an output is generated from the end detection means 12, and this signal causes the control means 14 to stop each reel driving means 15 and 16 and the output circuit. become.

Thereafter, when the tape cassette 1 is to be removed from the apparatus, the eject switch 18 is turned on, and a signal is sent from the control circuit 19 to the sweeping means 20, and the sweeping means 20 discharges the tape cassette 1 to the outside.

By the way, in such conventional magnetic recording devices,
Since the recorded magnetic tape 2 is ejected with the recording completed, for example, when this tape cassette 1 is inserted into a playback device and played back, the magnetic tape 2 must be rewound, making the operation complicated. It had the disadvantage of becoming

Therefore, it may be possible to configure the tape 2 to be automatically rewound when the end of the magnetic tape 2 is detected in the recording mode, but such a configuration would introduce the following new problems. You will encounter a point.

That is, when so-called scheduled recording is performed using the program switch 17, when the magnetic tape 2 reaches its end, it is automatically rewound, so when the scheduled recording time comes again and a signal is output from the program switch 17, The previously scheduled recording signal will be erased and a new signal will be recorded.

Therefore, even if you make a reservation for recording, there is a risk that the recorded video signal will be erased by mistake.

[Operation of the Invention] Therefore, the present invention has been made in order to eliminate the drawbacks of the conventional devices as described above. This invention automatically rewinds the magnetic tape when the magnetic tape ends in recording mode, and unloads the tape cassette containing the magnetic tape, thereby recording a new signal on the recorded magnetic tape. The object of the present invention is to provide a recording device that prevents erroneous recording.

The above-mentioned objects and other objects and features of the present invention will become more apparent from the following description of embodiments with reference to the drawings.

[Embodiment of the Invention] FIG. 3 is a block diagram showing the circuit configuration of an embodiment of the present invention, and is drawn in comparison with the configuration of the conventional device shown in FIG. As is clear from a comparison between FIG. 2 and FIG.
It is configured to operate based not only on the signal from the control means 8 but also on the signal from the control means 14. Therefore, it has a simple configuration and can be produced at low cost. This is the feature of this 91st embodiment. Incidentally, since each component is the same as that in FIG. 2, the same parts are given the same numbers and the explanation thereof will be omitted.

Next, the operation under such a configuration will be explained. When the recording mode is selected by the mode selection switch 13, the control means 14 controls the supply reel driving means 15.
controlling the one-take reel driving means 16 and the output circuit 11;
A video signal is recorded on the magnetic tape 2 in the same manner as described above. When the end of the magnetic tape 2 is detected by the end detection means 12,
A signal is provided from the edge detection means 12 to the control means 14 .

The control means 14 stops the operation of the supply reel drive means 151, the take-up reel drive means 16, and the output circuit 11 based on the signal, and then gives a signal to the supply reel drive means 15 and the take-up reel drive means 16. The respective drive means are driven to rewind the magnetic tape 2 in a direction opposite to the recording direction.

Furthermore, when the magnetic tape 2 is rewound and its end is detected by the end detecting means 13, in response to the detection signal, the control means 14 controls the supply reel driving means 15 and the winding 10.
- Stop the drive of the take-up reel drive means, and then control circuit 1
Give signal to 9. The control circuit 19 operates the sweeping means 20 based on this signal to sweep out the tape cassette 1.

When scheduled recording is performed using the program switch 17, the same operation as described above is performed. therefore,
When scheduled recording is performed and signals have been recorded up to the end of the magnetic tape 2, the magnetic tape 2 is automatically rewound and the tape cassette 1 is swept out by the pulling means 20, so that the scheduled recording time is resumed. Therefore, even if the signal from the program switch 17 is output, the signal will not be erroneously recorded on the magnetic tape 2. In other words, once recording is completed, the tape cassette 1 is ejected from the apparatus after rewinding the magnetic tape 2. Therefore, even if the program switch 17 is operated again next time, the magnetic tape 2 on which the signals have been recorded will not be returned to the tape cassette 1. Since the signal will not be recorded again on the top, erroneous recording can be prevented.

In the above description, the case where the edge of the magnetic tape 2 is detected in the recording mode has been explained, but even if, for example, the rewind mode is selected by the mode selection switch 13 while recording on the magnetic tape 2 is in progress, Upon completion of the rewinding, the end detection means 12 detects the magnetic chip 2.
Since the end of the tape cassette 1 is detected, rewinding is automatically stopped and the tape cassette 1 is swept out.

[Effects of the Invention] As described above, according to the present invention, when the rewinding of the magnetic tape is completed, the tape cassette is subsequently swept out, so that the signal can be recorded again on the magnetic tape on which the signal was recorded. It is possible to prevent such erroneous recording.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view showing a tape path system of a conventional magnetic recording apparatus. FIG. 2 is a block diagram showing the circuit configuration of a conventional magnetic recording device. FIG. 3 is a block diagram showing the circuit configuration of an actual tNPA of the present invention. In the figure, 1 is a tape cassette, 2 is a magnetic tape, 1
Reference numeral 2 indicates an end detection means, 14 a control means, 15 a supply reel drive means, 16 a take-up reel drive means, 17 a program switch, and 20 a sweeping means. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Masuo Oiwa 13-

Claims (4)

[Claims] (1) A magnetic recording device that records video signals on a magnetic tape housed in a cassette, comprising: an edge detection means for detecting an edge of the magnetic tape; a reel drive means for rewinding the magnetic tape; At the time of return, in response to the output of the end detection means, the reel driving means is stopped and a winding end signal is output.
In response to the winding end signal from the J control means and the 11JIII means,
cassette sweeping means for discharging the cassette;
Magnetic recording device. (2) The control means further stops the recording operation in response to the output of the end detection means during recording, and gives a signal to the reel driving means to start the operation. magnetic recording device. (3) The magnetic recording device according to claim 1 or 2, wherein the magnetic recording device has a scheduled recording function that starts a recording operation at a predetermined set time. (4) The magnetic recording device according to any one of claims 1 to 3, wherein the magnetic recording device further includes a playback function.