JPS6236548A - Dew formation sensor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a dew condensation sensor device useful for detecting dew condensation conditions in video tape recorders (VTRs).

BACKGROUND OF THE INVENTION In recent years, VTR devices have become more portable and the range of environments in which they can be used has expanded, so the risk of condensation has increased.

A conventional dew condensation sensor device will be described below with reference to the drawings. 4 and 6 are cross-sectional views of the conventional example, and FIG. 6 is a diagram showing the characteristics of the condensation sensor and the dew condensation characteristics of the cylinder.

In Fig. 4, 1 is the main body of the magnetic recording/reproducing device, 2 is a substrate, 3 is a cylinder with a rotating head, 4 is a cassette that stores a tape, and 5 is a cassette holder that stores the cassette 4 and moves up and down as shown by the arrow. , 6 is an opening of the device main body 1 provided for the lifting/lowering operation, 7 is a dew condensation sensor provided close to the opening 6, and 8 is an opening 6
and a first space between the substrates 2, 9 is a first space with respect to the substrate 2.
This is the second space on the opposite side of the space 80. Further, 10 indicates a circuit section coupled to the sensor.

Next, its operation will be explained. For example, in the winter, when a VTR device used outdoors is brought indoors, the condensation sensor 7 exhibits the characteristics shown in A in Figure 6, and detects changes in the environment when the resistance value reaches the condensation detection level. A1 is detected and the operation of the device is stopped. As time passes, water droplets adhering to the device or the dew condensation sensor dry up, and when the resistance value reaches release level A2, the device becomes ready for reuse.

Problems to be Solved by the Invention In the above explanation, the cassette holder 6 is in a lowered state as shown in FIG. 4, and the problem does not occur noticeably. When the cassette holder 5 is placed in the up position and left to dry, the first space 8
has a large exchange with outside air, which speeds up drying. At this time, the drying of the dew condensation sensor 7 also changes somewhat depending on the conditions such as the installed metal capacity, the room temperature, and the side radiation heat, but it is generally stopped and exhibits the characteristics shown in B in FIG. 6. As a result, the release level point B2 is the operable cleaning time point C of the dew condensation characteristic C of the cylinder 2.
1, the dew condensation sensor 7 dries more quickly than in the case 1, so that the device is set to an operable state even though the water droplets in the cylinder 2 are not yet dry. If the apparatus is used in this state, the tape in the cassette will stick tightly to the cylinder 2 and will not be able to move straight, resulting in damage to the tape or damage to the cylinder 2.

Means for Solving the Problems In order to solve the above-mentioned problems, the dew condensation sensor device of the present invention has a first space formed between the opening of the main body and the substrate, and a first space formed between the opening of the main body and the substrate. A dew condensation sensor is disposed in each of the second spaces on the opposite side of the room, and the dew condensation sensors are selectively used at the time of detection and release.

Function: Therefore, whether the cassette holder is in the dry state of the amplifier position or the lowered position, the condensation sensor will not dry out faster than the cylinder or running parts, ensuring normal functioning of the device. It is.

EXAMPLE Hereinafter, a dew condensation sensor device according to an example of the present invention will be described with reference to the drawings. FIGS. 1 and 2 are explanatory diagrams showing an embodiment of the present invention, and FIG. 3 is a diagram showing the characteristics of a dew condensation sensor and the dew condensation characteristics of a cylinder. 1 to 9 in the figure are the same as the conventional example. 11 is a second condensation sensor disposed in the second room 9; 12 is a control circuit connected to the two condensation sensors; when condensation is detected, one of the condensation sensors performs the detection operation (detection resistance value); When dew condensation detection is detected to be canceled, it operates according to the slower one of the dew condensation sensor's detection operation (when the rising detection resistance value falls to the release resistance value). It has become.

Next, the operation will be explained. When the cassette holder 6 is in the lowered position as shown in FIG. 1 and there is a dew condensation environment as shown in the conventional example, the first dew condensation sensor 7 exhibits a characteristic as shown in E in FIG. The sensor 11 exhibits characteristics such as M. At this time, since the circuit section 12 detects the faster characteristic,
It operates at the detection point of the first dew condensation sensor 7, designated El, and quickly puts the device 1 into a non-operational state. After some time has elapsed, the condensation sensor's resistance value decreases as the condensation continues to dry, reaching the release level.

At this time, the circuit section 12 detects the slower characteristic, so E
The non-operating state of the device is released at the detection point of the dew condensation sensor 7 indicated by 2. At this time, the drying point indicated by N1 on the drying characteristic N of the cylinder 2 is also dry in almost the same way over time, and the device operates normally.

Furthermore, when the cassette holder 5 is placed in the raised position and dried as shown in FIG. 2 a short time after the above-mentioned dew condensation detection, the first dew condensation sensor 7 exhibits a characteristic as shown in E.
Further, the second dew condensation sensor 11 exhibits a characteristic similar to that shown in FIG. At this time, dew condensation is detected at point E1 of the fast dew condensation sensor 7. At this time, since the opening 6 is open, the first
The space 8 dries significantly faster due to convection, secondary heat radiation, etc.

Further, the second dew condensation sensor 11 has a characteristic that the opening 6 is wide open, so that convection is large, and as a result, dew condensation is promoted. Therefore, the characteristics become as shown in M, and the resistance value increases with time. Since the second dew condensation sensor 11 is disposed in the second space 9, it is not directly exposed to drying factors such as side radiation heat, and therefore the drying time is long.

The drying of the device body 1 progresses, and the resistance value of the dew condensation sensor also decreases, reaching the release level. At this time, the circuit section 12 detects the point M'2 of the dew condensation sensor 11, which has the slower characteristic, and releases the non-operating state of the device. At this time, the cylinder 2 is in the first space 8
, so a lot of condensation occurs, but convection, side radiation heat, etc.
Since the drying factor is directly applied, the drying time becomes faster as shown by P2 of the dew condensation characteristic P.

Therefore, it dries sufficiently faster than the dew condensation sensor 11, and normal operation is ensured after the device is turned off.

Effects of the Invention Since the present invention has the above-described configuration, it has the following effects.

(a) Since the first dew condensation sensor is placed in the first space and the second dew condensation sensor is placed in the second space, when condensation occurs, the device is left in a dry state with the cassette holder in the up position. Also, the dew condensation sensor can have a drying time comparable to that of a running member such as a cylinder.

(middle) Therefore, after the device is released from the non-operating state, the device can operate normally without causing damage to the tape or cylinder.

[Brief explanation of the drawing]

1 and 2 are side sectional views of an embodiment of the present invention;
The figure also shows the condensation sensor characteristics at that time and the drying characteristics of the cylinder. Figures 4 and 5 are side sectional views of the conventional example. Figure 6 shows the condensation sensor characteristics at that time and the cylinder's drying characteristics. FIG. 3 is a diagram showing drying characteristics. 1... Device body, 2... Board, 6...
...opening, 7...first condensation sensor,
8...First space, 9...Second space, 11...Second dew condensation sensor, 12...
...Circuit section. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure q open Figure 6 v+ri

Claims (1)

[Claims] A first dew condensation sensor disposed in a first space formed by an opening in the apparatus main body as the cassette moves up and down and a substrate facing this opening; A second dew condensation sensor disposed in a second space located on the opposite side of the space, and a control circuit unit coupled to the dew condensation sensor; A dew condensation sensor device characterized in that the dew condensation sensor is configured to control the main unit by the dew condensation sensor which has a faster release operation and which has a slower release action at the time of release.