JPH04356752A - Magnetic recording and reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording and reproducing apparatus that can be used in a video tape recorder equipped with a rotating cylinder having two or more rotational speeds.

0002

2. Description of the Related Art In recent years, magnetic recording and reproducing devices using tape have been applied for various purposes, and in this case, the number of recording frames per second can be increased by using a different cylinder rotation speed and tape feed speed during recording than during playback. A magnetic recording/reproducing device that increases or decreases the number of magnetic fields and is used for special purposes such as slow-motion reproduction will be described.

[0003] Below, a conventional magnetic recording/reproducing apparatus used for this type of purpose will be explained with reference to the drawings. FIG. A rotating cylinder with a rotation speed of more than
2 is a magnetic tape, 3 is a capstan with two or more rotation speeds, and the rotary cylinder 1 has a video recording/reproducing head 4 mounted at a symmetrical position with respect to its central axis for recording and reproducing video signals. have. A pinch roller 5 pinches the tape 2 together with the capstan 3 and sends it out.

FIG. 3 is a timing chart showing the number of rotations of a rotating cylinder and a capstan with respect to time in a conventional magnetic recording/reproducing device.
N2 is the second rotational speed of the rotating cylinder during recording, N3 is the first rotational speed of the capstan during playback, N4 is the second rotational speed of the capstan during recording, t1 is the recording switch is turned ON, and the rotation speed of the rotating cylinder starts to shift from N1 to N2, and the rotation speed of the capstan also starts to shift from N3 to N4. t2 is the time when the capstan is locked at the rotation speed of N4, and t3 is the time when the rotation cylinder rotation speed starts to shift from N3 to N4. is locked at the rotation speed of N2 and actual recording begins, Ta is the time it takes for the capstan to reach the rotation speed from N3 to N4, and Tb is the time it takes for the rotating cylinder to reach the rotation speed from N1 to N2. Represents the time it takes to reach the number of revolutions. Here, Ta and T
During the time b, cylinder 1 and capstan 3
This is a period in which neither recording nor playback is possible because the speed is not constant.

The operation of the conventional magnetic recording/reproducing apparatus constructed as described above will be explained below.

[0006] This magnetic recording and reproducing device performs reproduction at the rotation speed of the rotary cylinder at N1 and the rotation speed of the capstan at N3, and then changes the rotation speed of the rotary cylinder to N2 and the rotation speed of the capstan to N4. When recording, the actual recording starts after the recording switch is turned on and the rotational speed of the rotary cylinder is locked at N2 and the rotational speed of the capstan is locked at N4.

[0007]

[Problem to be Solved by the Invention] However, in the above conventional configuration, it took Tb time for the rotary cylinder and Ta time for the capstan to lock the rotation speed at N2 for the rotary cylinder and N4 for the capstan. . Further, the time is Ta<Tb, and Ta is a time that does not pose a problem for immediate recording, but Tb takes much longer than Ta, so there is a problem that immediate recording is not possible.

The present invention solves the above-mentioned conventional problems. Instead of turning on the recording switch and then starting to increase the rotational speed of the rotary cylinder to N2, the present invention uses a recording standby function. To provide a magnetic recording/reproducing device capable of recording immediately, although it takes time to actually start recording after turning on a switch.

[0009]

[Means for Solving the Problems] In order to achieve the above object, in the present invention, the capstan stabilization time is subtracted from the recording standby time for changing the rotating cylinder from its first rotation speed to its second rotation speed. After a certain time, the recording switch is turned on and the capstan is changed from its first rotational speed to its second rotational speed, and then recording is started.

0010

[Operation] With the above-described configuration, the present invention provides a recording standby state for the rotational speed of the rotary cylinder, so that the rotational speed of the rotary cylinder can be stabilized at the second rotational speed N2 for recording. The time from turning on the switch to actually starting recording can be shortened.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic recording/reproducing apparatus according to an embodiment of the present invention will be described below with reference to the drawings. In one embodiment of the present invention as well, the configuration of the main parts around the rotating cylinder of the magnetic recording/reproducing device is completely the same as that of the conventional example shown in FIG. 2, and therefore the explanation thereof will be omitted. FIG. 1 is a timing chart showing the number of rotations of a rotary cylinder and a capstan with respect to time in the magnetic recording/reproducing apparatus of the present invention, and the same parts as in the conventional example are given the same reference numerals and detailed explanations will be omitted.

In FIG. 1, T1 is a recording standby switch (
(not shown) is turned on and the rotational speed of the rotating cylinder starts increasing from N1 to N2. T2 is the time when the rotational speed of the rotating cylinder reaches N2 and the lock is applied. T3 is the time when the recording switch (not shown) is turned on. T4, the time at which the capstan rotational speed begins to increase from N3 to N4, represents the time at which the capstan rotational speed reaches N4, locking is applied, and actual recording starts.

The operation of the magnetic recording/reproducing apparatus constructed as described above will be explained below. When attempting to record, the operator first puts the recording standby state in advance and turns on the recording standby switch to enter the recording standby state. Tb of time
The number of revolutions of the rotating cylinder in time is the first number of revolutions N1
The rotation speed is increased from 1 to 2, and the rotation speed is stabilized at N2, which is the second rotation speed, and is kept on standby, waiting for the timing to start recording. Therefore, when the recording switch is turned on at time T3, the rotational speed of the capstan 3 reaches the second rotational speed N4 from the first rotational speed N3 at time Ta of the capstan stabilization time, and recording starts immediately. can. This period of T3 corresponds to the time when one movement is about to start, for example in sports. The timing of T3 may be any time after T2, and in extreme cases, the rotating cylinder 1 and the capstan 3 can reach the predetermined speed at the same time if it is Ta time before or after time T2. It would be more convenient if the point at which the recording switch can be pressed is indicated by an indicator light or the like.

As described above, according to this embodiment, the time from turning on the recording switch to starting actual recording, which conventionally took Tb hours as shown in FIG. By providing this function, the time from when the recording switch is turned on until the actual recording starts can be shortened to Ta time as shown in FIG.

Although the present embodiment has been described with reference to the case where the number of rotations during recording is higher than that during reproduction, it goes without saying that the same effect can be applied when the number of revolutions during recording is lower than that during reproduction.

Further, in this embodiment, the number of revolutions is two, but it goes without saying that three or more numbers of revolutions are equivalent.

[0017]

As explained above, according to the present invention, after the recording standby switch is operated, the rotary cylinder is
Change the rotational speed from the first rotational speed to the second rotational speed Turn on the recording switch after the time obtained by subtracting the capstan stabilization time from the recording standby time to change the capstan from the first rotational speed to the second rotational speed. By configuring to start recording after the recording switch is turned on, it is possible to realize an excellent magnetic recording/reproducing apparatus that can start actual recording immediately after turning on the recording switch.

[Brief explanation of drawings]

FIG. 1 is a timing chart showing the number of rotations of a rotating cylinder and a capstan with respect to time in a magnetic recording/reproducing device according to an embodiment of the present invention.

[Fig. 2] A configuration diagram of the main parts around the rotating cylinder of the magnetic recording/reproducing device common to the conventional example and the present invention.

[Fig. 3] Timing chart showing the rotational speed of the rotary cylinder and capstan with respect to time in a conventional magnetic recording/reproducing device.

[Explanation of symbols]

T1 Recording standby switch ON time T2 Time when the rotating cylinder is locked at rotation speed N2 Time T3 Recording switch ON time T4 Recording start time Ta Capstan stabilization time Tb Recording standby time N1 First rotational speed of the cylinder N2 Second rotational speed of the cylinder Number of revolutions N3 First number of revolutions of the capstan N4 Second number of revolutions of the capstan 1 Rotating cylinder 2 Magnetic tape 3 Capstan 4 Video recording/playback head 5 Pinch roller

Claims (1)

[Claims] Claim 1: Turn on the recording switch to change the capstan to its first rotation speed after a time obtained by subtracting the capstan stabilization time from the recording standby time for changing the rotating cylinder from its first rotation speed to its second rotation speed. A magnetic recording/reproducing device configured to start recording after changing the rotational speed from a rotational speed to a second rotational speed.