JPS63317968A - Tape recorder device - Google Patents

Abstract

PURPOSE:To reduce the damage of a magnetic tape by rotating a cylinder motor at a low speed during operation of a tape loading mechanism and accelerating the cylinder motor up to a prescribed speed after completion of loading. CONSTITUTION:A cylinder motor 10 is started under the control by a cylinder motor control circuit 7 simultaneously with the start of loading operation of the tape loading mechanism. The circuit 7 rotates the motor 10 at a low speed until the detection signal indicating completion of loading is inputted from a loading completion switch 3. When the detection signal from the completion switch 3 is inputted to the circuit 7, the motor 10 is accelerated up to a prescribed rotative speed to rotate and drive a magnetic head at a high speed. At this time, a stable air lubricant layer is formed between the magnetic tape and the peripheral part of the cylinder and the operation of a tape tension optimizing mechanism is stable. Consequently, the magnetic tape is not damaged at the time of tape loading.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a tape recorder device such as a VTR.

(Prior Art) In a VTR, a pair of leading guide rollers (18) (1
9) is driven forward, and the magnetic tape (
16) is pulled out and brought into sliding contact with a VTR cylinder (17) equipped with a rotating magnetic head, thereby forming a predetermined tape running path.

Further, at the same time as the loading motor starts, a cylinder motor connected to the VTR cylinder (17) starts,
The magnetic head is rotated at high speed (for example, 3600 rpm).

The VTR is equipped with a tape tension optimization mechanism consisting of a tension lever that applies tension to the magnetic tape after loading is completed, a tape tension detection circuit equipped with a Hall element, etc., and thereby the tape tension is maintained at an appropriate value.

(Problem to be Solved) However, in conventional VTRs, the time required for the rotational speed of the VTR cylinder to reach 3600 rpm (third measurement point) is limited to the time required from the start of loading to the completion of loading (
During the loading operation, the magnetic tape (16) pulled out from the tape cassette (13) is transferred to the VTR after the magnetic head reaches high speed rotation. It will come into sliding contact with the cylinder (17). At the time of sliding contact, the magnetic tape (16) and VT
Since a stable air layer has not yet been formed between the circumferential surface of the R cylinder (17), when the magnetic head collides with the magnetic tape (16) at high speed, the magnetic tape (-16) cannot receive the lubricating effect of However, at the time when loading is completed, the operation of the tape tension optimization mechanism is still unstable, and optimization of tape tension has not yet been achieved. Therefore, there is a problem that the magnetic tape is damaged by the collision of the magnetic head, resulting in a shortened tape life.

In particular, in high-quality VTRs that are scheduled to be commercialized, the above problem is serious because the VTR cylinder rotation speed is 5400 rpm.

(Means for Solving the Problems) An object of the present invention is to provide a tape recorder that can significantly reduce damage to a magnetic tape during tape loading.

The tape recorder device according to the present invention connects a cylinder motor (10) that rotationally drives a magnetic head to a cylinder motor control circuit (7) to control the rotation speed, and
A detection signal from the switch (3) that detects the completion of the loading operation of the tape loading mechanism is supplied to the cylinder motor control circuit (7), and while the tape loading mechanism is in operation, the cylinder motor (10) is rotated at a low speed to complete the loading operation. After this is completed, the cylinder motor (10) is accelerated to a predetermined speed.

(Operations and Effects) Simultaneously with the start of the loading operation of the tape loading mechanism, the cylinder motor (10) is activated under the control of the cylinder motor control circuit (7).

The cylinder motor control circuit (7) rotates the cylinder motor (10) at a low speed (for example, 300 to 500 r 11I11 ) until a detection signal indicating completion of loading is input from the loading completion switch (3).

Therefore, along with the loading operation, the magnetic tape (16)
The rotational speed of the magnetic head is low when it comes into sliding contact with the cylinder (17), and even if the tape tension at the end of loading is slightly higher than the optimum value, the magnetic tape (17)
6) The collision force of the magnetic head against the magnetic head is very small.

Cylinder motor control circuit (7) When the detection signal from the loading completion switch (3) is input, the control circuit accelerates the cylinder motor (10) to a predetermined rotational speed and rotates the magnetic head at high speed (for example, 3800 rpm). Rotate and drive. At this time, a stable air lubrication layer has already been formed between the magnetic tape (16) and the circumferential surface of the cylinder, and the operation of the tape tension optimization mechanism is stable.

Therefore, in the tape recorder according to the present invention, the magnetic tape is not damaged during tape loading.

(Example) FIG. 1 shows an example in which a tape recorder according to the present invention is implemented in a VTR shown in FIGS. 4 and 5.

The input port of the main control circuit (1), which is the system controller, includes a conventionally well-known cassette insertion detection circuit (2),
Loading completion switch (3), cylinder motor rotation detection circuit (4), and tape tension detection circuit (5)
Each output end of is connected.

In addition, the output boat of the main control circuit (1) is connected to a loading motor (9), a cylinder motor (10), and a reel motor (11) via each motor control circuit (6), (7), and (8), respectively. It is connected.

Hereinafter, the operation of the circuit shown in FIG. 1 will be explained based on FIGS. 2 and 3.

When a tape cassette (13) is inserted into the VTR, the cassette insertion detection circuit (2) detects it (20).The detection signal is sent to the loading motor control circuit (6) and the cylinder via the main control circuit (1). It is supplied to the motor control circuit (7). The loading motor control circuit (6) drives (21) the loading motor (9) to operate the tape loading mechanism.

Also, the cylinder motor control circuit (7) drives the cylinder motor (10) at low speed (22) at the same time as loading starts.
Then, based on the detection signal from the cylinder motor rotation detection circuit (4), the rotation speed of the magnetic head is accelerated to point A (speed V 1 = 300 to 500 rl) In) in FIG.
Thereafter, the speed is maintained until point B, when loading is completed.

The loading completion switch (3) is turned on (23)
, when the detection signal is sent from the main control circuit (1) to the cylinder motor control circuit (7), the cylinder motor (10) is driven at high speed (24), and the magnetic head is moved to the 0 point (speed V 2 ) in FIG. = 360 rpm). This speed is maintained until it shifts to the stop mode (25), for example.9 In the above-mentioned VTR, the rotational speed ( (1) in FIG. 3 is low and the collision force of the magnetic head against the magnetic tape (16) is very small, so the life of the magnetic tape (16) is extended compared to the conventional one.

In addition, during the loading operation, the magnetic tape (16) is wound around the VTR cylinder (17) rotating at low speed, so when it comes into sliding contact with the circumferential surface of the cylinder, the magnetic tape (16)
16) is not strongly repelled by the magnetic head,
A smooth tape winding operation is performed from the start of loading to the completion of loading.

Note that the configuration of each part of the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the technical scope of the claims.

For example, the timing at which the cylinder motor shifts from a low speed stage to a high speed stage is set after loading is completed and after the tape tension detection circuit (5) detects that the tape tension has been optimized. Of course it is possible.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an electric circuit of a tape recorder according to the present invention, FIG. 2 is a flowchart showing the operation of the electric circuit, FIG. 3 is a graph showing changes in the rotational speed of the magnetic head, and FIGS. FIG. 5 is a plan view showing the loading operation of the VTR.

Claims (1)

[Claims] [1] By the operation of the tape loading mechanism, the magnetic tape (16) is pulled out from the pair of reels (14) and (15) and brought into sliding contact with a cylinder (17) equipped with a rotating magnetic head, In a tape recorder device that forms a predetermined tape running path, a cylinder motor (10) that rotationally drives the magnetic head is controlled by a cylinder motor control circuit (7).
The detection signal of the switch (3) which controls the rotational speed and detects the completion of the loading operation of the tape loading mechanism is transmitted to the cylinder motor control circuit (
7), the cylinder motor (10) is rotated at low speed while the tape loading mechanism is in operation, and the cylinder motor (10) is accelerated to a predetermined speed after loading is completed. [2] The tape recorder device according to claim 1, wherein the rotational speed of the cylinder motor (10) at low speed is 300 rpm to 500 rpm, and the rotational speed after acceleration is 3600 rpm.