JPH0397189A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To properly control the internal temperature of a magnetic recording and reproducing device and to reduce noise at the same time by controlling a cooling fan corresponding to the detected level of a temperature detection part. CONSTITUTION:The cooling fan 13 provided in order to radiate heat generated in the inside of the magnetic recording and reproducing device 1 is properly controlled according to the level detected by the temperature detection part 12 provided in the device 1 through a control part 11 which controls the cooling fan 13. That means, since the detected level of the temperature detection part 12 is low when the internal temperature of the device 1 is low, the action of the cooling fan 13 is controlled by the control part 11 so that it acts at a low revolving speed. Thus, the performance of the device 1 is sufficiently secured by setting the internal temperature of the device 1 higher than an ambient temperature and the noise is reduced by making the rotation of the cooling fan 13 low. As the result, the performance and the user's operability of the device 1 become excellent.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic recording and reproducing device that uses a cassette containing a magnetic tape and records or reproduces information signals using a rotating head. This invention relates to control of a cooling fan to appropriately control temperature.

[Conventional technology]

Conventionally, when a magnetic recording/reproducing device operates, the internal temperature of a magnetic recording/reproducing device rises to a high temperature due to heat generated from the circuit system and mechanical system. In order to prevent performance degradation, a cooling fan is provided on the rear panel to reduce the internal temperature. In other words, by operating the cooling fan, external air is taken in and the internal temperature inside the magnetic recording/reproducing device is reduced by forced convection6.
In addition, related devices of this type include, for example,
Matsushita Mll format VTR instruction manual (p-
25).

[Problems to be Solved by the Invention] The above-mentioned conventional technology is equipped with a cooling fan to prevent performance deterioration caused by temperature rise due to heat generated inside the magnetic recording/reproducing device. The operation is simply linked to the power switch of the magnetic recording/reproducing device (i.e., when the power switch is turned on, it always operates at a constant rotation speed), so the cooling fan will operate regardless of the ambient temperature of the magnetic recording/reproducing device. Since it operates at a constant rotation speed, when the ambient temperature is low, the temperature inside the magnetic recording/reproducing device may drop too much, resulting in performance deterioration, or the cooling fan may be running at maximum airflow all the time. However, there were problems with temperature control and noise inside the magnetic recording/reproducing device.

The present invention achieves the following by appropriately controlling the operation of the cooling fan.
The purpose is to optimize the temperature inside the magnetic recording and reproducing device and reduce the noise caused by the operation of the cooling fan. [Means for Solving the Problems] In order to achieve the above object, a cooling fan provided in a magnetic recording and reproducing device, a control unit that controls the cooling fan, and a temperature detection unit that detects the internal temperature of the magnetic recording and reproducing device are provided. and
The cooling fan is appropriately controlled via the control section based on the detection level of the temperature detection section.

In addition, when a recording mode is commanded in the system control section that commands the operating mode of the magnetic recording/reproducing device, the cooling fan is controlled by the command from the system control section, which is determined by the detection level of the temperature detection section at that time. The cooling fan is operated so that the control value of the control unit is constant.

Furthermore, a temperature detecting section provided within the magnetic recording/reproducing device is arranged near the rotary head (cylinder section) of the mechanism section.

[Effect]

In the magnetic recording and reproducing apparatus of the present invention, the cooling fan provided for dissipating heat generated inside the magnetic recording and reproducing apparatus is controlled by the detection level of the temperature detection section provided within the magnetic recording and reproducing apparatus. This is done appropriately via a control section that performs each control. In other words, when the internal temperature of the magnetic recording/reproducing device is low, the detection level of the temperature detection section is low, so the cooling fan is controlled to operate at a low rotation speed by the control section. By setting the internal temperature of the product to a higher temperature (e.g., 20°C to 30°C, etc., which is optimal for performance) than the ambient temperature (low temperature (10°C, etc.)), sufficient performance can be ensured. The low rotation speed of the cooling fan results in low noise, high performance, and excellent usability.

In addition, in the case of recording mode, which has a particularly high power consumption as an operating mode of a magnetic recording/reproducing device for professional use, the amount of heat generated is large; Because it affects the touch conditions, it is possible to obtain a more stable recording condition by
In the system control unit that commands the operation mode of the magnetic recording and reproducing device, when the recording mode is commanded, the control value of the control unit that controls the cooling fan is held, which is determined by the detection level of the temperature detection unit at that time, The cooling fan is operated from the system control section via the control section so that the control value remains constant, and the environmental conditions in the mechanism section in the recording mode are maintained in a constant and stable state. Furthermore, by installing the temperature detection section in the magnetic recording/reproducing device near the rotating head of the mechanism section, that is, the cylinder section, the contact state between the tape and the rotating head, which affects the performance of the magnetic recording/reproducing device, can be maintained appropriately. Therefore, the performance of the magnetic recording/reproducing device can be sufficiently ensured.

〔Example〕

An embodiment of the present invention will be explained below with reference to the drawings. FIG. 1 is a system configuration diagram showing one embodiment of the magnetic recording/reproducing apparatus of the present invention, and FIGS. Figure 2) and noise level characteristics (Figure 3). A system control section, 11 is a control section that controls the operation of the cooling fan 13, 12 is a temperature detection section, 20 is a cylinder section provided with a rotating head 21, etc., 22 is an inclined guide, 23
is a guide pin.

Next, the operation will be explained.

A cassette 3 containing a tape 4 is installed in the magnetic recording/reproducing device 1 at a predetermined position, and the tape 4 in the cassette 3 is guided through the inclined guides 22a, 22b and the guide pins 23a, 23.
b, etc., and wind it at a predetermined position on the cylinder part 20, and place the mechanism part 2 on the running tape 4 for recording or reproducing information signals with the rotary head 21 provided in the cylinder part 20, and the mechanism part 2 in an appropriate position. Various control circuits (not shown) including a system control unit 10 for controlling operations, signal processing circuits (not shown), and the like are housed.

The present invention further includes a cooling fan 13 for dissipating heat generated inside the magnetic recording/reproducing apparatus 1 to the outside, a control section 1l for controlling the air volume of the cooling fan 13, and a rotary head 21 ( A temperature detection section 12 installed near the cylinder section 20) is provided. That is, by mounting the cassette 3 containing the tape 4 in a predetermined position in the mechanism section 2 in the magnetic recording/reproducing device ill, the tape 4 is pulled out by the inclined guides 22a, 22b, gad pins 23a, 23b, etc.
The tape 4 is wound around a predetermined position of 0 and rotated at a predetermined speed, and an information signal is recorded or reproduced by a rotary head 21 provided in a cylinder section 20.

By the way, the magnetic recording and reproducing apparatus 1 for business use consumes a large amount of power (for example, approximately 600W for a 1/2-inch high-definition magnetic recording and reproducing apparatus). Since performance degradation occurs due to the temperature characteristics of the mechanical system, it is desirable to keep the internal temperature of the magnetic recording/reproducing device l as constant as possible.

(In terms of performance, a range of 20°C to 30°C is appropriate for the internal temperature.) Therefore, although professional magnetic recording and reproducing devices are generally equipped with a cooling fan 13, it is not a fan that is linked to a cooling finch. , it just operates so that the maximum airflow is always achieved. Therefore, there is no problem when the ambient temperature is high, but when the ambient temperature is low, the inside of the magnetic recording/reproducing device 1 is also lowered to a temperature lower than the optimum temperature range, resulting in a decrease in performance. Since it operates based on airflow, it has drawbacks such as constant noise.

In comparison, in the magnetic recording/reproducing apparatus 1 of the present invention, the temperature detecting section 12 for detecting the internal temperature of the magnetic recording/reproducing apparatus 1 is provided in the vicinity of the rotary head 21 in the cylinder section 20 of the mechanism section 2 that most affects the performance. is provided to detect the internal temperature of the magnetic recording/reproducing device l, and inputs the detection level of the temperature detection unit 12 to a control unit l1 that controls the operation of the cooling fan 13, and the control unit 11 controls the operation of the cooling fan. It is something to do.

That is, as shown in the characteristics shown in FIG. 2, when the ambient temperature of the magnetic recording/reproducing apparatus 1 changes, the internal temperature characteristic 32 of the magnetic recording/reproducing apparatus 1 changes due to the conventional cooling fan 13 always being operated at the maximum air volume. In contrast, in the magnetic recording/reproducing apparatus 1 of the present invention, the internal temperature of the magnetic recording/reproducing apparatus 1 is detected by the temperature detecting section 12, and the control section 11 is controlled based on the detection level.
By varying the operating voltage of the cooling fan 13 as shown in the cooling fan driving voltage characteristic 30 in FIG.

In other words, the ambient temperature that can be controlled between 20°C and 30°C, which is the appropriate range for the internal temperature of the magnetic recording/reproducing device 1, was approximately 17°C to 27°C in the past, but in the present invention, it is approximately 5°C. The control range can be more than doubled from ℃ to 27℃, making it possible to solve the problem of performance degradation. Furthermore, as shown in the noise level characteristics shown in FIG. 3, since the operation of the cooling fan 13 is varied by the control unit 11 depending on the ambient temperature of the magnetic recording/reproducing device 1 according to the detection level of the temperature detection unit 12, the ambient temperature is particularly low. In this case, the rotational speed of the cooling fan 13 is reduced, so that the noise level characteristic 40 of the present invention achieves lower noise, compared to the noise level characteristic 41 which conventionally operates at a constant rotational speed. be able to. Incidentally, the power consumption of the magnetic recording/reproducing apparatus 1 is large in the recording mode, which requires a large amount of current, except during startup (about 10 seconds). Particularly in the recording mode, if proper contact between the tape 4 and the rotary head 21 cannot be obtained, it will be difficult to ensure performance. Therefore,
In the present invention, during the recording mode, the operating mode of the magnetic recording/reproducing device Wl is commanded so that the environmental conditions (air volume, air flow, temperature, etc.) in the mechanism section 2 are constant in order to stabilize the contact state. When the recording mode state is set in the system control unit 10, the control value of the cooling fan 13 determined by the control unit 11 from the detection level of the temperature detection unit 12 at that time (that is, the characteristic shown in FIG. For example, when the ambient temperature is 15.degree. C., the drive voltage v1 of the cooling fan 13 is controlled to be constant (the value of the drive voltage v1 of the cooling fan 13 set by the control section 1l based on the detection level of the temperature detector 12). Therefore, the internal temperature of the magnetic recording/reproducing device 1 will rise slightly compared to the characteristic 3l in FIG. Since the environmental conditions at 2 can always be kept constant, stable tape 4 and rotating head 2! This makes it possible to maintain stable performance. [Effects of the Invention] As described above, according to the magnetic recording and reproducing apparatus of the present invention, the operation of the cooling fan that is essential for magnetic recording and reproducing apparatuses that consume a large amount of power such as those for business use can be controlled by the magnetic recording and reproducing apparatus. A temperature detection unit that detects the internal temperature is installed near the rotating head of the mechanism that affects performance, and the cooling fan control unit controls the cooling fan in accordance with the detection level of the temperature detection unit. Even if the ambient temperature of the recording/reproducing device changes, the internal temperature of the magnetic recording/reproducing device can be appropriately controlled, ensuring optimal performance at all times.
In addition, the cooling fan can reduce the noise of the magnetic recording and reproducing device. In addition, in order to maintain a constant environmental condition of the mechanism during the recording mode, which is important for ensuring the performance of the magnetic recording/reproducing device, the system control section that issues the recording mode command sends a signal to the detection level of the temperature detection section at the time of the recording mode command. By operating the cooling fan while keeping the control value set in the control section that controls the cooling fan constant, the environmental conditions of the mechanism section in the recording mode can be kept constant, and the tape and rotating head can be kept constant. It is possible to provide a magnetic recording/reproducing device with excellent performance and reliability, such as being able to stably secure contact and ensuring stable performance.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram showing an embodiment of the magnetic recording/reproducing apparatus of the present invention. FIG. 2 is an internal temperature characteristic diagram of the magnetic recording/reproducing apparatus shown in FIG. FIG. 3 is a noise level characteristic diagram in the magnetic recording/reproducing device shown in the figure. DESCRIPTION OF SYMBOLS 1... Magnetic recording and reproducing device, 2... Mechanism part, 3...
cassette, 4... tape, 10... system control section, 11... control section, 12... temperature detection section,
13...Cooling fan, 20...Cylinder part, 21.
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Claims (3)

[Claims] 1. A cassette (3) containing a magnetic tape (4) is attached to a predetermined position of the magnetic recording/reproducing apparatus (1), and the rotating head (21) records or reproduces information signals in the magnetic recording/reproducing apparatus (1). , a cooling fan (13) for dissipating internal heat of the magnetic recording/reproducing device (1), and a control unit (11) for controlling the air volume of the cooling fan (13).
and a temperature detection section (12) for detecting the internal temperature of the magnetic recording/reproducing device (1), and the control section (
11) A magnetic recording/reproducing device characterized in that the air volume of the cooling fan (13) is controlled through the cooling fan (13). 2. In the air volume control method of the cooling fan (13),
In the system control unit (10) that commands the operation mode of the magnetic recording and reproducing device (1), when the command of the system control unit (10) commands the recording operation mode, the temperature detection unit (12) at that time; a control unit (11) that controls the cooling fan (13) based on the detected temperature;
The cooling fan (13) is controlled by the system control section (10) via the control section (11) so that the control value of the cooling fan (13) is held constant. The magnetic recording and reproducing device described above. 3. The magnetic sensor according to claim 1 or 2, wherein the temperature detection section (12) is arranged near a rotary head (21) of a mechanism section (2) in the magnetic recording/reproducing device (1). Recording and playback device.