JPH07272348A - Magnetic recording/reproducing device - Google Patents

Abstract

PURPOSE:To provide a magnetic recording/reproducing device capable of preventing erroneous operations of a system caused by slackening a tape when loading is temporarily stopped. CONSTITUTION:This is a magnetic recording/reproducing device provided with a tape pulling out means 14 for pulling out a magnetic tape 2 from a tape cassette 3 and winding it on a rotary head drum 1 and a detecting means 11 for detecting the start and end of the magnetic tape 2. It is further provided with a detecting operation control means 16 for stopping the operation of the detecting means 11 for detecting the start and end of the magnetic tape when the tape pulling out operation of the tape pulling out means 14 is temporarily stopped and a certain passage of time after this stop.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a tape pull-out means for pulling a magnetic tape from a tape cassette and winding it around a rotary head drum, such as a VTR and a DAT, and a detecting means for detecting the start and end of the magnetic tape. The present invention relates to a magnetic recording / reproducing apparatus having the same.

[0002]

2. Description of the Related Art A conventional magnetic recording / reproducing apparatus of this type, for example, a VTR will be described below with reference to FIGS. Here, FIG. 3 is a schematic explanatory view showing a state before a tape drawing operation (hereinafter referred to as loading) in the conventional magnetic recording / reproducing apparatus, and FIG. 4 is a schematic explanatory diagram showing a loading completion state in the conventional magnetic recording / reproducing apparatus. FIG. 5, FIG. 5 is a schematic explanatory view showing a state during loading in the conventional magnetic recording / reproducing apparatus, FIG. 6 is a schematic explanatory view showing a tape position detecting operation in a normal state in the conventional magnetic recording / reproducing apparatus, and FIG. It is a schematic explanatory view showing a tape position detection operation in a state where the magnetic tape is slack in the magnetic recording and reproducing apparatus.

A conventional magnetic recording / reproducing apparatus includes a rotary head drum 1 having a rotary magnetic head, a tape guide and a guide roller for winding a magnetic tape 2 around the rotary head drum 1 at a predetermined angle to form a tape running path. The mounted first chassis (not shown) and the magnetic tape 2
And a second chassis (not shown) to which the tape cassette 3 in which is stored is mounted.

Further, in the second chassis, in order to detect the tape start end (hereinafter, referred to as tape top) and the tape end (hereinafter, referred to as tape end) of the magnetic tape 2, the tape cassette 3 is mounted. 3, a light emitting element 4 provided so as to be located inside, and light receiving elements 5 and 6 for receiving light emitted from the light emitting element 4.

The operation of the magnetic recording / reproducing apparatus constructed as described above will be explained. From the state before loading shown in FIG. 3, the magnetic tape 2 is pulled out by the tape guide and the guide roller, and the rotary head drum 1 is predetermined. While wrapping at an angle, move the second chassis with the tape cassette 3 mounted in the direction of the rotary head drum 1,
The loading is completed as shown in FIG.

If the rotary head drum 1 is exposed to dew during loading, the magnetic tape 2 is attached to the rotary head drum 1 and the magnetic tape 2 is rotated by the rotational force of the rotary head drum 1. There is a risk that the tape will be pulled out of the tape cassette 3 and will be wound around the rotary head drum 1 in multiple layers.

Therefore, in order to avoid such a state, while the magnetic tape 2 is in contact with the rotary head drum 1 during loading (see FIG. 5), the loading is temporarily stopped and the rotary head drum 1 is driven. Measures such as monitoring the load current of a motor (not shown) are taken. If the magnetic tape 2 sticks to the rotary head drum 1 and the motor load current increases in the dewed state as described above, the drive motor is immediately stopped to change the magnetic tape. This prevents a situation in which the tape 2 is pulled out from the tape cassette 3 and wrapped around the rotary head drum 1 in multiple layers.

Further, since the tape top and tape end portions have a higher light transmittance than the magnetic tape portion, the light emitted from the light emitting element 4 is received by the light receiving elements 5 and 6 with the dashed line in the figure as an optical path. The tape top and the tape end of the magnetic tape 2 are detected by detecting whether or not the light is received by a light transmission level detection circuit (hereinafter referred to as an S / E sensor circuit, not shown). That is, as shown in FIG. 6, the light path is blocked at the magnetic tape portion and is not received by the light receiving elements 5 and 6, while the light is transmitted at the tape top and tape end portions.
Is received by. Therefore, the tape top and the tape end of the magnetic tape 2 can be detected by detecting the light transmission level with the S / E sensor circuit.

Detection of such tape top and tape end is performed by VTR FF (fast forward) / REW (rewind).
It is necessary to detect the tape end and stop the tape feeding mechanism (not shown) in the mode and the PLAY (reproduction) / REC (recording) mode. In the full top state (the tape top portion is the light emitting element 4 and the light receiving element 5,
6) and the full-end state (the tape end portion crosses the optical path between the light emitting element 4 and the light receiving elements 5 and 6). The E sensor circuit has been operating since the tape cassette 3 was loaded (see FIG. 3).

This is because, for example, RE in the full top state
If the W operation is attempted, an excessive tension is applied to the magnetic tape 2 in an attempt to pull out the magnetic tape 2 from the tape take-up reel, and there is a risk that the magnetic tape 2 may be cut. Therefore, it is necessary to not accept the REW mode immediately at the time of full top.

[0011]

In the above-mentioned magnetic recording / reproducing apparatus, when the rotary head drum 1 is in a dewed state, the magnetic tape 2 is pulled out from the tape cassette 3 and the rotary head drum 1 is piled up in multiple layers. In order to prevent the winding, the loading is temporarily stopped during the loading, but at the time of loading, the tape supply reel and the tape take-up reel are rotated by the pulling out of the magnetic tape 2. Therefore, the magnetic tape 2 cannot be stopped suddenly by the magnetic tape 2 as shown in FIG.
Is reeled out from each reel, causing slack in the tape.

As described above, when the magnetic tape 2 is slack in the tape cassette 3, the magnetic tape 2 may move to the light emitting element 4 side as shown in FIG. The light cannot be blocked completely, and the light is incident on the light receiving window 8 provided in the tape cassette 3 and received by the light receiving elements 5 and 6. As a result, the signal detected by the S / E sensor circuit is transmitted to a microcomputer (hereinafter, referred to as CPU) that controls mechanical operation, and the tape top or tape end portion is detected even though it is a magnetic tape portion. There is a problem that the system is malfunctioned by erroneously recognizing that.

Further, in order to prevent the slack of the magnetic tape from being generated, a brake mechanism is provided for applying an appropriate braking force to the tape supply reel and the tape take-up reel at the time of loading, or the braking force is applied at the moment when the loading is temporarily stopped. However, according to these, there is a problem that the structure of the equipment becomes complicated, the weight and size increase, and the production cost increases. .

The present invention has been made in view of the above points, and has a simple structure and can prevent a system malfunction caused by a slack of a tape during a temporary stop operation during loading. The purpose is to provide.

[0015]

In order to solve the above-mentioned problems, a magnetic recording / reproducing apparatus according to the present invention comprises a tape pull-out means for pulling out a magnetic tape from a tape cassette and winding the magnetic tape around a rotary head drum, and In a magnetic recording / reproducing apparatus having a detection means for detecting the start end and the end, the detection operation of the start end and the end of the magnetic tape by the detection means is stopped when the tape pull-out operation by the tape pull-out means is temporarily stopped and thereafter for a certain period of time. The detection operation control means is provided.

[0016]

In the magnetic recording / reproducing apparatus according to the present invention, since the detection operation of the leading end and the trailing end of the magnetic tape by the detecting means is stopped at the time of temporary stop during loading and for a certain period of time thereafter, the structure of the device is complicated and the weight is heavy. It is possible to prevent the malfunction of the system caused by the slack of the tape during the temporary stop operation during loading without increasing the size and the production cost.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a magnetic recording / reproducing apparatus of the present invention will be described below with reference to FIGS. 1 and 2, but the same parts as those of the above-mentioned conventional example are designated by the same reference numerals and the description thereof will be omitted. Omit it. 1 is a block diagram showing the magnetic recording / reproducing apparatus of this embodiment, and FIG. 2 is a timing chart showing the tape position detecting operation in the magnetic recording / reproducing apparatus of this embodiment.

In the magnetic recording / reproducing apparatus of this embodiment, as shown in FIG. 1, the light emitted from the light emitting element 4 is applied to the magnetic tape 2.
Light receiving elements 5 and 6 for receiving light via the S / E sensor circuit 11 for detecting the light amount level received by the light receiving elements 5 and 6.
Based on the detection signal from the S / E sensor circuit 11, the tape feed mechanism 13 is instructed to perform operation control such as tape end processing (for example, AutoREW (automatic rewind)), and the cassette loading mode (Fig. 3)), a loading completion mode (see FIG. 4), and other mechanical operation states, and sends this information to the drive control unit 16.
12 are provided.

Further, a drive controller for controlling the operation of the loading motor 14, the drum motor 15 for driving the rotary head drum 1, and the S / E sensor circuit 11 based on the mechanical operation information in various modes detected by the CPU 12. 16 are provided.

In the above structure, the drive controller 16
Is, for example, a mechanical drive switch whose contact position is variable in response to a drive mechanism that drives a tape guide pole, a guide roller, etc. to pull out the magnetic tape 2 from the tape cassette 3 and wind it around the rotary head drum 1. You may comprise by.

The loading motor 14 is a drive motor for driving the tape guide pole, the guide roller, etc., and the magnetic tape 2 is driven by the forward rotation.
Is loaded. Also, the drum motor 15
A load current detection circuit 17 is provided for monitoring the load current of No. 1 and outputting data to the CPU 12 as to whether or not there is any abnormality in the rotary head drum 1.

The operation of the magnetic recording / reproducing apparatus configured as described above will be described with reference to FIG. First, when the tape cassette 3 is loaded in the cassette loading position (see FIG. 3), the CPU 12 detects this state and the drive controller 1
Data is output to 6. The drive controller 16 receives the mechanical operation information and turns on the S / E sensor circuit 11. Therefore, the S / E sensor circuit 11 starts operating and starts sending a detection signal to the CPU 12.

Here, for example, when a reproduction button or the like is operated, a signal is transmitted to the loading motor 14, the loading motor 14 starts to rotate normally, and loading is performed. At the same time, the drum motor 15 is activated, and the rotary head drum 1 starts rotating.

As described above, the VTR is provided with the temporary stop mode for temporarily stopping the loading at the position where the magnetic tape 2 contacts the rotary head drum 1 during the loading, and the drive control unit 16 The loading motor 14 is controlled to stop once at a predetermined position during loading.

The drive control unit 16 includes the S / E sensor circuit 11
Also, in this temporary stop mode, the CPU 12 is controlled so as to be in the non-operating state (off), and the detection signal is not sent to the CPU 12. That is, as shown in FIG.
Even if the light emitted from the light emitting element 4 is received by the light receiving elements 5 and 6 due to the magnetic tape 2 sagging during the temporary stop operation during loading, the S / E sensor circuit 11 is off. No position detection operation is performed.

Then, the load current detection circuit 17 monitors the load current of the drum motor 15, and the rotary head drum 1
After confirming that there is no abnormality in the rotation, the loading motor 14 is restarted to restart the loading, and at the same time, the S / E sensor circuit 11 is brought into the operating state (on) again.

When the loading is completed, the drive controller 1
In response to the completion of loading from the CPU 12, 6 controls the loading motor 14 to stop. On the other hand, in the playback mode, the rotary head drum 1
In the S / E sensor circuit 11, the operating state is continued.

In the above embodiment, the CPU 12 and the drive control unit 16 are provided to facilitate understanding of the operation.
Although description has been made of the case where the and are separately provided, it goes without saying that the operation of the drive control unit 16 may be performed by the CPU 12.

In the above embodiment, the magnetic recording / reproducing apparatus including the first chassis for forming the tape running path and the second chassis in which the tape cassette 3 is mounted has been described. Obviously, it may be a magnetic recording / reproducing apparatus having a single chassis which forms a traveling path and in which a tape cassette is mounted.

[0030]

Since the magnetic recording / reproducing apparatus according to the present invention is configured as described above, the detecting operation of the leading end and the trailing end of the magnetic tape by the detecting means is stopped when the magnetic tape is temporarily stopped during loading and for a fixed time thereafter. Therefore, it is possible to prevent the malfunction of the system caused by the slack of the tape during the temporary stop operation during loading without complicating the configuration of the equipment and increasing the weight, size and production cost.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a magnetic recording / reproducing apparatus of the present invention.

FIG. 2 is a timing chart showing an embodiment of the magnetic recording / reproducing apparatus of the present invention.

FIG. 3 is a schematic plan view showing a state when a cassette is mounted (before loading) in a conventional magnetic recording / reproducing apparatus.

FIG. 4 is a schematic plan view showing a state of loading completion in a conventional magnetic recording / reproducing apparatus.

FIG. 5 is a schematic plan view showing a state in which the magnetic recording / reproducing apparatus of the related art is temporarily stopped during loading.

FIG. 6 is a schematic side view showing an optical path of tape position detection light in a normal state in a conventional magnetic recording / reproducing apparatus.

FIG. 7 is a schematic side view showing the optical path of the tape position detection light when the loading is temporarily stopped in the conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

 1 rotating head drum 2 magnetic tape 3 tape cassette 4 light emitting element 5 light receiving element 6 light receiving element 7 reel hub 8 light receiving window 11 S / E sensor circuit 12 CPU 13 tape feeding mechanism 14 loading motor 15 drum motor 16 drive control section 17 load current detection circuit

Claims (1)

[Claims] 1. A magnetic recording / reproducing apparatus having a tape pull-out means for pulling out a magnetic tape from a tape cassette and winding the magnetic tape around a rotary head drum, and a detecting means for detecting a start end and an end of the magnetic tape. A magnetic recording / reproducing apparatus provided with detection operation control means for stopping the detection operation of the leading end and the end of the magnetic tape by the detection means when the tape drawing operation is temporarily stopped and thereafter for a certain period of time.