JPS6122459A - Dew condensation preventing device - Google Patents

Abstract

PURPOSE:To prevent dew condensation by detecting a temperature difference at the inside and outside of the device and locking a shutter means at a cassette loading slit under a condition where the temperature in the device is lower than the temperature at the outside of the device into the closing state to prevent flowing-in/-out of the air to/from the device. CONSTITUTION:When a power switch of the device is applied and a device inner temperature t1 and a device outer temperature t2 detected by the 1st and 2nd temperature detection sensors 6, 7 have a relation of t1 t2 or t1>t2, a shutter switching restriction lever 11 is lowered by the absorption of an electromagnetic device converter 10, a shutter 9 is opened and the normal operation of the device is attained. When t1<t2, the shutter switching restriction lever 11 is elevated by electromagnetic device converter 10 and the shutter 9 is locked to the closing state. Since the temperature difference between the inside and outside of the device is detected in this way, the environment of dew condensation is caught earlier to prevent flowing-in/-out of the air at the inside/outside of the device, dew condensation is prevent in excellent way.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a dew condensation prevention device that can be used particularly in a recording/reproducing device using a magnetic recording medium.

Conventional Structure and Problems Conventionally, it has been known to install a dew condensation sensor inside the casing of a magnetic recording/reproducing device, etc., and to prohibit the use of the magnetic recording/reproducing device, etc. when a dew condensation state is detected. Its configuration will be explained using FIG. 1. 1S, a cylindrical guide drum with a built-in rotating magnetic head of a magnetic recording and reproducing device;
2 is a tape; 3 is a number of guide posts connected to a drive source for winding and running the tape 2 around the guide drum 1; 4 is a dew condensation sensor; and 5 is a drying heater attached to the guide drum 1. .

It is known that dew condensation occurs due to the difference between the ambient temperature and the device temperature when the magnetic recording/reproducing device is suddenly moved from a low temperature location to a high temperature location. In particular, if water droplets form on the guide drum 1 or the guide post 3, the tape running becomes unstable and the tape 2 etc. are damaged, so the use of the magnetic recording/reproducing device is prohibited.

Further, when the dew condensation state inside the device is detected by the dew condensation sensor 4, the drying heater 5 dries the attached water droplets.

However, such a conventional configuration has the disadvantage that it takes a considerable amount of time to dry the water droplets, and the magnetic recording/reproducing device cannot be used during that time.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and an object of the present invention is to provide a dew condensation prevention device that can effectively prevent the occurrence of dew condensation.

Structure of the Invention In order to achieve the above object, the dew condensation prevention device of the present invention comprises a first temperature detection stage disposed inside the device to prevent condensation, and a second temperature detection stage disposed outside the device. The temperature detected by the temperature detection means, the shutter means for opening and closing the cassette insertion port of the device, and the first and second temperature detection means are substantially the same, or the temperature detected by the first temperature detection means is substantially the same. The control means is configured to enable opening and closing operations of the shutter means when the temperature is higher than the temperature detected by the second temperature detection means.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a configuration diagram of the main parts of a magnetic recording and reproducing device equipped with a dew condensation prevention device according to an embodiment of the present invention, in which 6 is a first temperature sensor that detects the temperature inside the device, and 7 is a temperature outside the device. 8 is a control circuit for comparing and processing the 11i difference detected by the two temperature detection sensors 6 and 7; 9 is a conventionally well-known electromagnetic sensor operated by a signal from the control circuit 8; The shutter of the cassette insertion slot is controlled by the mechanism converter 10 via the shutter opening/closing regulating lever 11, and 12 is a power source.

Next, the operation will be explained. When the power switch of the magnetic recording/reproducing device is turned on, the difference in temperature detected by the first and second temperature detection sensors 6.7 is almost the same, or the internal temperature of the device is 11t.
1 is higher than the device temperature rise t2, that is, from t1 to t2
Alternatively, when tl>t2, the shutter opening/closing regulating lever 11 locked to the shutter 9 is pulled down by the attraction of the electromagnetic mechanism converter 10, the shutter 9 is opened, and the apparatus can operate normally. Also, the temperature t1 inside the device is the knitting degree t outside the device.
2, that is, when tl<t2, the shutter opening/closing regulating lever 11 locked to the shutter 9 is pushed up by the electromagnetic transverse transducer 10. The shutter 9 is locked in the closed position as shown.

In the above embodiment, the shutter 9 is directly opened and closed by the electromagnetic mechanism converter 1°, but the shutter 9 is locked in the closed state when tl<t2, and is locked when tl<t2 or jl>t2. The shutter 9 may be opened and closed by another mechanism or manually after the release.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, the environment in which condensation occurs is detected by detecting the temperature difference inside and outside the device, and the shutter means of the cassette insertion slot is activated under conditions where the temperature inside the device is closer to the temperature rise of the device. Since the system is set to a leap day state to prevent air from flowing into and out of the device, it is possible to effectively prevent condensation from occurring. Furthermore, even if dew condensation occurs, there is little adhesion of water droplets, which is advantageous in reducing the drying time of the drying heater, and in turn making the drying heater more compact and lower in power consumption.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a magnetic recording and reproducing device equipped with a conventional dew condensation prevention device, and FIG. 2 is a configuration diagram of the main parts of a magnetic recording and reproducing device equipped with a dew condensation prevention device according to an embodiment of the present invention. .

Claims (1)

[Claims] 1. A first temperature detection means disposed inside the device to prevent condensation, a second temperature detection means disposed outside the device, and a shutter means for opening and closing the cassette insertion slot of the device. and when the temperatures detected by the first and second temperature detection means are approximately the same or the temperature detected by the first temperature detection means is higher than the temperature detected by the second temperature detection means, the shutter is A condensation prevention device comprising a control means for opening and closing the means.