JPH04121033U - Rotary head player operation control device - Google Patents

Abstract

(57) [Summary] [Purpose] When the rotating head device is in a state of condensation,
To enable heating time and operation stop time of a rotary head device to be set to optimal lengths. [Structure] Based on the structure of the equipment, the size of the rotary head device, the position of the rotary head device and the dew condensation detector, etc., we can experimentally determine, for example, the relationship between the heating time of the heating member and the dew condensation release time of the rotary head device itself, and The heating time of the heating member and the drive stop time of the device are determined in advance to be optimal values by examining the cooling time of the rotary head device after heating is stopped. When the dew condensation detector outputs an output indicating that the dew condensation state has been detected, the heating member starts heating the rotary head device, and this heating time continues for a certain period of time regardless of the output from the dew condensation detector. The operation stop period of the device is also set to a predetermined time, and this time is made longer than the heating time.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a magnetic recording and reproducing device for VTR, DAT, and computer data backup. Regarding rotary head type players such as raw equipment, the equipment may become damaged due to sudden temperature changes, etc. In particular, the operation to stop the operation when the rotating head device becomes condensed. Regarding a control device.

0002

[Conventional technology]

In players with rotating head devices, the magnetic field drawn from within the cassette pack The tape runs while being wound around a rotating head device. Therefore, sudden temperature If the temperature changes, dew condensation will easily form inside the device. Especially aluminum alloy The outer periphery of the rotating head device made of any metal is prone to condensation; When the magnetic tape is wrapped around the rotating head device, the tape is loaded. If the magnetic tape is wet, the magnetic tape will adhere to the outer peripheral surface of the rotary head device due to moisture. When the rotating drum of the rotating head device is driven, the magnetic tape is transferred to the rotating drum. If the magnetic tape is wound up or left unattended with the rotating drum stopped, sticks to the outer periphery of the rotating head device and cannot be peeled off, causing severe tape damage. Become.

0003 Therefore, as shown in FIG. 4 are arranged facing each other, and the rotary head device 1 is made of the same material as the rotary head device 1 inside the device. A formed sensing body 5 and a dew condensation sensor 6 attached to this sensing body 5 were provided. A device is being considered. When the detection body 5 becomes dew condensed due to a sudden change in temperature, this condensation occurs on the dew condensation sensor 6. is detected, and it is determined that the rotary head device 1 made of the same material as the detection body 5 is in a dew condensation state. do. Then, the rotary head device 1 is heated by the heater 4, and at the same time, the rotary head device 1 is heated. Unwind the magnetic tape from position 1 (tape unloading state) and start operation. to stop. In the conventional device, the detection output from the dew condensation sensor 6 disappears. In other words, after it is detected that the dew condensation on the sensing body 5 has been removed, the heater 4 is turned on. At the same time, the equipment is returned to a state where it can be operated.

0004

[Problem that the idea aims to solve]

However, after detecting condensation and stopping the operation of the device as described above, the condensation If the device is restarted after the dew condensation detection output from sensor 6 disappears, the operation will stop. The disadvantage is that the interval is longer than necessary. That is, the dew condensation sensor 6 is in a dew condensation state. After this is detected, the rotating head device 1 is heated by the heater 4, and due to this heating, However, since the sensing element 5 is not directly heated by the heater 4, , the dew condensation on the sensing body 5 will be removed later than the dew condensation on the rotary head device 1. Therefore, even after the condensation on the rotating head device 1 is actually removed, the operation suspension period continues. become. In particular, considering the safety of dew condensation detection, the detection body 5 is usually For example, if the device is located near the outside of the device, where condensation is more likely to occur. Then, when the dew condensation sensor 6 notifies the dew condensation release state, it is quite late and the operation is stopped. The period is set longer than necessary.

[0005] Furthermore, after the dew condensation detection output from the dew condensation sensor 6 can no longer be obtained as in the conventional case, If you stop heater 4 and immediately start recording or playback, the heat may cause Distortion remains in the rotating drum 3 and fixed drum 2, and the magnetic head scans the magnetic tape. Accuracy will be reduced.

[0006] This invention solves the above-mentioned conventional problems. This eliminates the need for unnecessarily long stop times and avoids distortion caused by the heat of the rotating head device. A motion control device for a rotary head player that allows it to start operating after the is intended to provide.

[0007]

[Means to solve the problem]

The operation control device for a rotary head player according to the present invention heats the rotary head device. A heating member to detect condensation, a condensation detector to detect condensation inside the device, and a condensation detector to detect condensation. The heating member is operated for a predetermined period of time when a dew detection output is obtained. and the magnetic tape is applied to the rotating head device for a certain period of time that is longer than the operating time of the heating member. and a control unit for stopping the winding operation of the loop. It is.

[0008]

[Effect]

In the above measures, the structure of the equipment, the size of the rotating head device, the rotating head device and the condensation For example, the heating time of the heating member and the rotating head equipment can be determined experimentally based on the placement position of the detector. The relationship with the dew condensation release time of the equipment itself, and the cooling of the rotating head device after heating has stopped. Check the heating time of the heating member and the drive stop time of the device in advance by checking the Set to the optimal value. Then, the dew condensation detector outputs the detected dew condensation state. When the temperature is reached, the heating member starts heating the rotary head device, and this heating time lasts until It continues for a certain period of time regardless of the output from the dew detector. and the period when the device is out of operation. The heating time is also a predetermined time, and this time is longer than the heating time. This control This eliminates condensation on the rotating head device, and also prevents distortion due to heat in the rotating head device. Operation can be started at the optimal point when the gas is exhausted, and operation can be stopped for a longer period than necessary. can be prevented from continuing.

[0009]

【Example】

Hereinafter, the present invention will be explained with reference to the drawings. FIG. 1 shows the circuit structure of an operation control device for a rotary head player according to an embodiment of the present invention. 2 is a time chart showing the operation, and FIG. 3 is a flow chart. In the drive control device shown in FIG. A heating member (heater) 4 is provided at a portion facing the outer periphery of the stationary drum 2 of the pad device 1. It is being Also, a location different from the rotary head device 1, for example, than the rotary head device 1. If the material of the rotating head device 1 is A detection body 5 made of the same material as, for example, an aluminum alloy is installed. , a dew condensation sensor 6 is attached to this detection body 5.

0010 Reference numeral 10 is a control unit mainly composed of a CPU, and this control unit 10 controls the rotating head. The driver 11 of the drum motor M that drives the rotating drum 3 of the storage device 1 and the tape The drive motor of the loading mechanism 12 and the like are controlled. In various mode settings etc. , the control operation of the control unit 10 is performed based on the operation signal of the operation unit 13. Reference numeral 14 is a power switch. This power switch 14 is operated by a command from the control unit 10. The heating member 4 is turned on and off by the command signal, and the heating member 4 is heated when the power is turned on. Heat is initiated. The output from the dew condensation sensor 6 is detected by the dew condensation detection section 15, and the output is A. The signal is input to the control section 10 via the /D conversion section 16.

[0011] A storage section provided in the control section 10 stores device characteristics in advance based on experimental data, etc. The optimal heating time Th by the heating member 4 (see FIG. 2(B)) and this heating time The operation stop time (operation acceptance refusal time) Tr that is longer than Th is stored, and ON/OFF control of the power switch 14 based on the stored time Th program and a program that refuses to accept operations from the operation unit 13 based on the time Tr. grams are memorized.

0012 Further, in FIG. 1, reference numeral 17 indicates a display section, and in this display section 17, each In addition to displaying the operating mode, it also indicates that the heating member 4 is being heated and that the operation is being accepted. It is now possible to display information such as that the request is being rejected.

[0013] Next, the operation of the above operation control device will be explained based on the flowchart of FIG. When the power is turned on, the program stored in the control unit 10 causes the condensation It is monitored whether a dew condensation detection output is output from the sensor 6 (step (a)). condensation When the detection output is obtained, in step (b), it is determined whether the device is currently operating. If it is in operation, the drum mode is set in step (c). The drive motor of the tape loading mechanism 12 is started to load the tape. unload it away from the rotating head device and back into the cassette pack, and then Then move on to step (d). In step (b) it is determined that the device is not operational. If so, proceed to step (d) without proceeding to step (c).

[0014] In step (d), the power switch 14 is turned on to start heating by the heating member 4. Start. At the same time, the reception of the operation from the operation unit 13 is refused. Shown in Figure 2(B) After the predetermined heating time Th set in the control unit 10 has elapsed, , regardless of the output from the dew condensation sensor 6, turn off the power switch 14 and turn off the heating section. Heating by material 4 is stopped (step (e)). Furthermore, in step (f), When a preset time Tr has elapsed since the start of rejection of crop acceptance, the operation unit 13 is activated. Cancels the refusal of operation acceptance.

[0015] The heating time Th shown in FIG. long enough to eliminate condensation after the condition is reached, but not too long than necessary. It is determined based on experimental values. Furthermore, the operation reception shown in Figure 2(C) The heating rejection time Tr is the period when the dew condensation on the rotating head device 1 disappears after heating is stopped, and the rotation is continued. The length is sufficient to eliminate distortion due to heat of the rotating head device 1, and it is not longer than necessary. It is set so that it is not too much.

[0016] Therefore, by the operation shown in FIG. 3, when dew condensation occurs on the rotating head device 1, it is removed. After the condensation has completely disappeared and the distortion caused by the heat of the rotating head device has disappeared. The operation from the operation unit 13 is accepted and the recording or playback operation is resumed. I'm going to growl. Therefore, the dew condensation on the sensing body 5 is released, and the dew condensation sensor 6 Regardless of whether or not the condensation has disappeared, the condensation on the rotating head device 1 itself can be removed in the shortest possible time. This means that it can be executed in sufficient time. Note that in the operation described in the above embodiment, the tape is unloaded in step (c). At the same time, the rotation of the rotating drum 3 is stopped, but after unloading the tape, The rotating drum 3 is rotated during the heating time so that the heat is evenly distributed to the rotating drum. Good too.

[0017]

[Effect of the idea] According to the present invention described in detail above, when there is condensation, the operation continues for a longer period than necessary. There is no need to stop the machine, and there is no condensation on the rotating head device, reducing distortion caused by heat. It will be possible to resume operation after it is gone.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an operation control device according to an embodiment of the present invention;

FIG. 2 is a time chart showing the operation of the circuit configuration of FIG. 1;

FIG. 3 is a flowchart showing the control operation of the control unit according to the circuit configuration of FIG. 1;

FIG. 4 is a front view of a rotary head device showing a conventional example.

[Explanation of symbols]

1 Rotating head device 2 Fixed drum 3 Rotating drum 4 Heating member 5 Sensing object 6 Condensation sensor 10 Control section

Claims (1)

[Scope of utility model registration request] Claim 1: A heating member that heats a rotating head device;
a dew condensation detector that detects dew condensation within the device; and a condensation detector that operates the heating member for a predetermined period of time when a dew condensation detection output is obtained from the dew condensation detector, and a constant period that is longer than the operation time of the heating member. 1. An operation control device for a rotary head player, comprising: a control section that stops winding the magnetic tape around the rotary head device for a certain amount of time.