JPH01271959A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To securely read a program searching signal by making the traveling angle of a magnetic head different from the direction of a lead part of a rotary drum at the time of half-loading. CONSTITUTION:When a cassette is loaded, a base 5 is ascended from a chassis 13 to be held in a prescribed position, and a base 7 is descended to be held. And, an auxiliary post is moved along with the movement of the bases 5 and 7 to form a tape path under the half-loading condition. By this method, a magnetic tape is traced approximately in the whole area by the rotary head covering plural recording tracks, so that it is considered substantially equivalent to detecting an access signal in such a way that the whole of one recording track is traced by the rotary head. By this method, the program searching signal can be read out wherever it may be recorded in the recording track.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device that performs recording and playback by pulling out a tape from a cassette and winding it around a rotating drum. The present invention relates to a magnetic recording/reproducing device capable of forming a tape path with a magnetic field.

[Prior Art] Conventionally, when reading signals recorded on a magnetic tape using a single-rotation head and searching for the beginning, the winding around the rotating drum has large corners and running resistance in the same tape path as during recording and playback. Since the size of the magnetic tape increases, there is a limit to the speed at which the magnetic tape can be fed, so it has been considered to wrap the tape around the rotating drum in a shallow tape path, a so-called half-loading state.

[Problems to be Solved by the Invention] In the conventional half-loading state as described above, as shown in FIG. The rotating head cannot trace over almost the entire width of the magnetic tape, and can only trace a portion of the recorded track (the shaded area in Figure 7). Therefore, depending on which part of the recording track the cue signal is located, the cue signal cannot be reliably read unless the winding condition on the rotating drum is changed. . Therefore, the number of tape paths that can be formed is limited, and there is a possibility that an optimal tape path cannot be selected during recording and playback.

The present invention has been made to solve this problem, and an object of the present invention is to provide a magnetic recording/reproducing device that can reliably read cue signals.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a rotating drum that can form a tape path in which the rotating head traces almost the entire width of the magnetic tape even during half loading. By making the height positions of the tape pull-out post on the entrance side and the tape pull-out post on the exit side different, the cueing signal can be reliably read.

[Function] With the above configuration, in this invention, a tape path is formed in which the tracing angle of the rotary head with respect to the magnetic tape is different from that during normal playback during half loading, and it is possible to determine at which position on the recording track Even if the signal is recorded, it can be read out.

[Embodiment] FIG. 1 is a plan view showing the tape path when the magnetic tape is completely wound around the rotating drum and when the magnetic tape is shallowly wound around the rotating drum in so-called half loading. FIG. 2 is a side view showing the operation of the tape drawer post on the inlet side of the rotating drum, and FIG. 3 is a side view showing the operation of the tape drawer post on the outlet side of the rotary drum.

In the figure, 1 is the tape drawer post on the entrance side, 3 is the tape drawer post on the outlet side, and tape drawer posts 1, 3
is erected on bases 5, 7 and moves along rails 6.8. Reference numerals 9, 10, and 11 are auxiliary posts for preventing twisting of the magnetic tape during half-loading.

When the cassette 12 is loaded, the loading motor is energized and the bases 5 and 7 begin to move along the rails 6.8 and pull out the magnetic tape.As shown in FIG. The base 7 is raised relative to the chassis 13 and held in place, as shown in FIG.
It descends and is held. Further, as the bases 5 and 7 move, the auxiliary post 9 moves in the direction of arrow A in FIG.
．． 11 similarly moves in the direction of arrow B in FIG. 1 to form a tape path in a half-loaded state.

Figure 4 shows the positional relationship between the rotating drum 14 and the magnetic tape in this state. If the lead section 15 that regulates the height of the magnetic tape during recording and playback is connected, the tape may run over the tape path. Lead part 1
A discontinuous portion 16 is formed at 5. Figure 5 shows the poor tracing condition of the rotary head with respect to the recording tracks in this tape path. Therefore, it is essentially equivalent to the rotary head tracing the entire recording track of one tree to detect the cue signal.

By the way, when the cueing mode is set, the magnetic tape is wound up by the reel while the cueing signal is read by the rotary head. When a cue signal at the specified position is detected, the magnetic tape stops running, the bases 5 and 7 are moved in the full loading direction, and the magnetic tape is wound around the rotating drum to the winding angle position for recording and playback. and stop.

At this time, as shown in FIG. 1, the auxiliary post 9 moves in the direction of arrow C, and the auxiliary posts 10 and 11 move in the direction of arrow C, respectively, to separate from the magnetic tape. Additionally, post 17.18
The magnetic tape moves in the directions of arrows E and F to form a tape path during recording and reproduction, and the magnetic tape is driven to run at a constant speed by the pinch roller 19 and capstan 2o, and reproduction of the recording main signal is started.

Note that during half loading as described above, the recording track and the azimuth of the rotating head are misaligned, but since the cueing signal such as time code is a low frequency signal, reading is possible with little azimuth loss, and the cueing function is It is quite effective. Furthermore, when it is necessary to read out high frequency signals, a dedicated rotary head with matched azimuth may be added.

[Effects of the Invention] As explained above, the present invention allows the rotating head to trace almost the entire width of the magnetic tape by changing the running angle of the magnetic tape with respect to the lead portion of the rotating drum during half loading. This has the effect that the cue signal can be read out no matter where on the recording track it is recorded.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the tape path in an embodiment of the present invention, FIG. 2 is a side view showing the operation of the tape drawer post on the rotary drum inlet side during half loading in FIG. 1, and FIG. FIG. 4 is a side view showing the operation of the tape drawer post on the exit side of the rotating drum during half loading, FIG. 4 is a front view showing the positional relationship between the magnetic tape and the rotating drum during half loading in the embodiment of the present invention, 5 is a diagram showing the tracing state of the rotary head with respect to the recording track in the case of FIG. 4, FIG. 6 is a front view showing the positional relationship between the magnetic tape and the rotary drum during conventional half-loading, and FIG. FIG. 6 is a diagram showing the tracing state of the rotary head with respect to the recording track in the case of FIG. 6; In the figure. 1: Tape drawer post on the rotating drum entrance side 3: Tape drawer post on the rotating drum outlet side 6.8: Tape drawer post guide guide rail 9, 10.11
: Auxiliary post 14 Two-rotation drum 15: Lead part 16: Discontinuous part of lead Agent Patent attorney 1) Haru Kitatake Figure 4 Figure 6

Claims (1)

[Claims] In a device that records and plays a magnetic tape by winding it around a rotating drum at a predetermined angle using a tape drawer post, and reads a cue signal using a rotating head, the first tape is recorded and played back in a fully loaded state. The second step during half-loading where the pass and tape are shallowly wrapped around the rotating drum.
The tape path forming means is characterized in that when forming the second tape pass, the tracing range of the rotary head relative to the magnetic tape covers almost the entire width of the magnetic tape. Magnetic recording and reproducing device.