JPS62128048A - Tape recorder - Google Patents

Abstract

PURPOSE:To improve the modulation noise characteristic without providing especially a flutter roll by allowing a pinch roll, which is arranged above a magnetic head in the direction of tape running, to function as the flutter roll or the like. CONSTITUTION:The first capstan 2 and the first pinch roll 3 pressed to this capstan are provided on the left of a center magnetic head 1, and the second capstan 4 and the second pinch roll 5 pressed to this capstan are provided on the right. A tape cassette 6 has capstan insertion holes 7 and 8 fitted to capstans 2 and 4 and is set. When the reproducing operation is performed, the magnetic head 1 enters into a head window 9 and is brought into contact with a magnetic tape 10, and the second pinch roll 5 is press-fitted to the second capstan 4 to hold the magnetic tape 10 between them, and the magnetic tape 10 is run in the direction of an arrow X1. When the tape end comes, the second pinch roll 5 is separated from the second capstan 4, and the first pinch roll 3 is press-fitted to the first capstan 2 to hold the magnetic tape 10 between them, and the magnetic tape 10 is run in the direction of an arrow X2.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tape recorder, and more particularly to a tape recorder that runs a tape in forward and reverse directions.

In prior art tape recorders, one of the noises associated with the tape is modulation noise. Modulation noise is generated by amplitude fluctuations and phase fluctuations that the tape receives during the signal recording and playback process.

Figure 6 shows what happens when a conventional tape recorder records a test signal on a standard tape and plays it back.Rather than playing back the test tape on which the test signal is recorded, it records the signal on a raw tape and plays it back. This shows the output characteristics of a tape recorder. In the same figure,
The part surrounded by circles a and b is modulation noise, frequency: 10
Modulation noise is seen at kHz±1kHz, around level knee 40 output.

Conventionally, this modulation noise is caused by tape vibration near the magnetic head.
Flutter roller so that the J node can be formed.

It was removed by providing a scrape filter or a small roller called an FM roller.

Problems to be Solved by the Invention Due to the configuration in which a dedicated port is separately provided,
The cost of tape recorders increased accordingly.

An object of the present invention is to provide a tape recorder that solves the above problems.

Means for Solving the Problems The present invention provides a tape recorder configured to run the tape in forward and reverse directions, in which a pinch roller on the upstream side in the tape running direction is brought into contact with the tape, so that the pinch roller It is configured to function similarly to a flutter roller or the like.

Embodiment Next, an embodiment of the tape recorder according to the present invention will be described.

In FIG. 2, a first capstan 2 and a first pinch roller 3 that press against it are provided on the left side of the central magnetic head 1, and a second capstan 4 and a first pinch roller 3 are provided on the right side. A second pinch row 55 is provided.

The tape cassette 6 is installed by fitting the capstan insertion holes 7° 8 with the capstans 2 and 4, respectively. When a playback operation is performed, the magnetic head 1 enters the head window 9 and comes into contact with the magnetic tape 10, and the second pinch roller 5 presses against the second capstan 4 and pinches the magnetic tape 10. 110 runs in the x1 direction of the arrow. When the tape end is reached, the second pinch roller 5 touches the second capstan 4.
The first pinch roller 3 presses the first capstan 2 and pinches the magnetic tape 10, and the magnetic tape 10
travels in the 2 directions indicated by the arrow.

11, 12 are pinch roller arms, and 13 and 14 are shafts. The lengths of the pinch roller arms 11 and 12 and the positions of the axes 13 and 14 are such that the center of the first pinch roller 3 is offset to the left of the first capstan 2, and the center of the second pinch roller 5 is offset to the left of the first capstan 2. The capstan 4 is deviated to the right from the capstan 4 of No. 2. Since each pinch roller is offset from its corresponding capstan in this way, the following operations are possible.

When the magnetic tape 10 runs in the direction of arrow x1, the arm 11 rotates counterclockwise, and the first pinch roller 3 on the upstream side enters the window 15 and comes into contact with the magnetic tape 10. It is positioned at a position P+ shown by a solid line, which does not reach the tape clamping position shown by a dashed line in the figure. Furthermore, this position P
+ is a position where the first pinch roller 3 presses the magnetic tape 10 and attaches the magnetic tape 10 to the first capstan 2; comes into contact with the capstan 2 of the 1st
The capstan 2 is rotating in the same direction as the second capstan 4, as shown by arrow A.

The magnetic chip 710 pulled out from the tape winding body 16 is
The first pinch roller 3 is rotated while the first pinch roller 3 is rotated, and the first capstan 2 is attached.

After experimenting with this tape recorder, the characteristics shown in FIG. 3 were obtained. Comparing FIG. 3 with FIG. 6, it can be seen that modulation noise has been removed. This is because the first pinch roller 3 functions similarly to the flutter roller and the like described above.

Furthermore, the above comparison shows that the overall level has decreased and the flutter component has decreased. this is,
This is because the magnetic tape 10 is attached to the first capstan 2.

When the magnetic tape 10 runs in the x2 direction, the second pinch roller 5 operates in the same manner as the first pinch roller 3 described above.

As a result, according to the tape recorder described above, modulation noise characteristics and flutter characteristics are improved when the magnetic tape 10 runs in the x1 and x2 directions of the arrows.

FIG. 4 shows the main part of another embodiment of the present invention. When the magnetic tape 10 runs in the direction of the arrow X1, the first pinch roller 3 moves to a position P2, which is slightly before the above-mentioned position IT P +.
The magnetic tape 10 is positioned at the magnetic tape 10 and comes into contact with the magnetic tape 10 . Unlike the above, the magnetic tape 10 is not in contact with the first capstan 2.

The magnetic tape 10 rotates and runs on the first pinch roller 3. The first pinch roller 3 functions similarly to the flutter roller.

When the magnetic tape 10 runs in the x2 direction of the arrow, the second pinch roller 5 operates in the same manner as the first pinch row 53 described above.

According to this tape recorder, the characteristics corresponding to FIG. 6 become as shown in FIG. 5, and the modulation noise characteristics are improved.

Note that the mechanism for positioning the first pinch roller 3 at the position F P + or P2 can be easily constructed by those skilled in the art, and therefore its explanation will be omitted.

Note that the present invention is applicable not only to the above-mentioned cassette tape recorder but also to reel-to-reel tape recorders. Furthermore, the present invention may be configured such that the upstream pinch roller is positioned somewhat apart from the capstan in a dual capstan type tape recorder.

Effects of the Invention As described above, according to the present invention, the pinch roller arranged on the upstream side with respect to the magnetic head in the tape running direction functions in the same manner as a 7-lutter roller, etc. In other words, without increasing the cost, the modulation l
It has the advantage that it is possible to improve the sound characteristics, and further, by bringing the magnetic tape into contact with the upstream capstan, it is possible to improve the flutter characteristics, which cannot be improved with a flutter roller or the like.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a main part of an embodiment of the tape recorder according to the present invention, FIG. 2 is a diagram schematically showing an embodiment of the tape recorder according to the present invention, and FIG. 3 is a diagram shown in FIG. 2. A diagram showing the modulation noise characteristics of a tape recorder, FIG. 4 is a diagram showing the main part of another embodiment of the present invention, FIG. 5 is a diagram showing the modulation noise characteristics of this embodiment, and FIG. 6 is a diagram showing the modulation noise characteristics of a conventional tape recorder. FIG. 3 is a diagram showing modulation noise characteristics of an example of a recorder. 1... Magnetic head, 2... First capstan, 3
...First pinch roller, 4...Second capstan, 5...Second pinch roller, 5...Tape cassette, 10...Magnetic tape, 11.12...Pinch Roller arm, 13.14...axis, 15...window. Patent applicant: TIATSUKU Co., Ltd. Figure 2 □ x 2 Fit liquid number (Hl) Figure 5 Shuu number (KH2) Figure 6 Hani number (H2)

Claims (3)

[Claims] (1) A tape recorder in which a pair of capstans and a pinch roller are arranged on each side of a magnetic head, and the magnetic tape is held and driven by the capstan and the pinch roller and runs in the forward and reverse directions. , an upstream pinch roller disposed upstream of the magnetic head in the running direction of the magnetic tape contacts the magnetic tape but does not pinch the magnetic tape between it and the upstream capstan. A tape recorder characterized in that it can be positioned at any position. (2) A tape recorder in which a capstan and a pair of pinch rollers are arranged on each side of a magnetic head, and the magnetic tape is held and driven by the capstan and the pinch roller and runs in the forward and reverse directions. , an upstream pinch roller disposed upstream of the magnetic head in the running direction of the magnetic tape is brought into contact with the magnetic tape, and the magnetic tape is brought into contact with the upstream pinch roller and the upstream cap. 1. A tape recorder characterized in that the tape recorder is positioned such that the magnetic tape is in contact with a stun but is not sandwiched between the magnetic tape and the upstream capstan. (3) A patent claim characterized in that the upstream capstan rotates in the same direction as a downstream capstan arranged downstream with respect to the magnetic head in the running direction of the magnetic tape. The tape recorder according to the second item in the range.