KR19980023473A - Dew condensation video cassette recorder and driving method - Google Patents

Abstract

The present invention relates to a video cassette recorder, comprising: a heater (17) configured in a lower cylinder (22) of a head drum (2), the step (41) of measuring humidity of the video cassette recorder; Determining (42) whether the measured humidity is above a predetermined reference humidity; Driving according to a set mode when the measured humidity is equal to or less than a predetermined reference humidity; When the measured humidity is equal to or greater than the predetermined reference humidity, switching to the stop mode and driving the heater 17 until it becomes equal to or less than the predetermined reference humidity is provided.

That is, the present invention has the effect that the heater is built in the lower cylinder of the head drum, the dew can be removed in a short time by using the heater in the case of dew condensation on the head drum.

Description

Dew condensation video cassette recorder and driving method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video cassette recorder (hereinafter referred to as a VCR), and more particularly, to a dew condensation preventing VCR and a driving method for preventing dew condensation occurring on a drum in a VCR according to a temperature difference from the outside.

In a VCR, the head drum is equipped with a video head that records / reads a video signal on the video tape, which is a main component that rotates to enable helical scanning of the video tape.

On the other hand, VCR may cause dew on internal boards and head drums due to high humidity or temperature differences with the outside.In particular, when dew condensation occurs on head drums, tape damage may occur during video tape scanning of video heads. You can.

Conventionally, a separate humidity sensor is configured in the VCR to prevent tape damage due to dew condensation of the head drum. That is, when the humidity in the VCR sensed by the humidity sensor is above a predetermined reference value, the VCR automatically switches to the stop mode, thereby preventing tape damage due to dew condensation.

However, this method has a disadvantage in that the VCR cannot be driven in a mode such as regeneration until the humidity in the VCR naturally becomes below a predetermined value.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a dew condensation preventing VCR which makes it possible to forcibly reduce the humidity in the VCR.

Another object of the present invention is to provide a method of driving a VCR that enables to lower the humidity in the VCR forcibly.

The dew condensation preventing VCR according to the present invention comprises an upper cylinder and a lower cylinder, and the upper cylinder is connected to the rotor through an axis passing through the lower cylinder, the head drum of the VCR configured to rotate in accordance with the rotation of the rotor, the lower cylinder The heater which is a heat generating body is comprised in it, and is comprised so that the temperature of a head drum can be raised selectively.

The present invention also provides a method of driving a VCR in which a heater is configured in a lower cylinder of a head drum, the method comprising: measuring humidity of a VCR; Determining whether the measured humidity is equal to or greater than a predetermined reference humidity; Driving according to a set mode when the measured humidity is equal to or less than the predetermined reference humidity; And when the measured humidity is equal to or greater than the predetermined reference humidity, switching to the stop mode and driving the heater until the predetermined reference humidity is less than the predetermined humidity.

1 is a block diagram of a video cassette recorder for preventing dew condensation according to the present invention.

2 is a schematic diagram of a head drum of a video cassette recorder according to the present invention;

3 is a cross-sectional view of the lower drum in the head drum according to the present invention.

4 is a flowchart of a method of driving a video cassette recorder for preventing dew condensation according to the present invention.

Explanation of symbols on the main parts of the drawings

11: recording processing system 12: reproduction processing system

13: Deck 14: Micom

15 Key Matrix 16 Humidity Sensor

17: heater

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a VCR according to the present invention, and as shown, a recording processing system 11 and a reproduction processing system 12, a deck 13, a microcomputer 14, a key matrix 15, and a humidity sensor ( 16 and a heater 17.

Here, the recording processing system 11 records and processes the video and audio signals applied from a tuner or an external input terminal (not shown) under the control of the microcomputer 14, and applies them to the deck 13, and the deck 13 receives the microcomputer. According to the control of (14), the video signal of the recording processing system 11 is recorded on the video tape, or the signal of the video tape is read and applied to the reproduction processing system 12. At this time, the deck 13 includes a head drum 2 as shown in Figure 2, the head drum 2 is composed of an upper cylinder 21 and a lower cylinder 22.

The upper cylinders 21 are equipped with video heads CH1 and CH2 and are connected via the rotor 23 and the shaft 24 to rotate in accordance with the rotation of the rotor 23. Here, the lower cylinder 22 is to remain fixed.

In this case, as shown in FIG. 3, the lower cylinder 22 includes a heater 17, and the heater 17 is formed of a resistor, and the like, and a predetermined amount of heat under the control of the microcomputer 14 as described below. Will emit heat.

The reproduction processing system 12 is configured to reproduce the video signal of the video tape detected from the deck 13 and apply it to a display device such as a monitor (not shown). The humidity sensor 16 is provided at a predetermined place inside the VCR. It is configured to detect the humidity inside the VCR and apply it to the microcomputer 14.

The microcomputer 14 controls the driving of the recording processing system 11, the reproducing processing system 12, and the deck 13 in this manner, and the mode for controlling the driving is one of various function keys of the key matrix 15. The control is performed in response to a key selected or pressed by the user. In addition, the humidity information of the VCR measured by the humidity sensor 16 of the microcomputer 14 is received. When the humidity inside the VCR is higher than a predetermined reference humidity, the VCR is configured to be driven in the stop mode. . That is, when the internal humidity of the VCR is higher than or equal to a predetermined value, the microcomputer 14 stops the driving VCR mode and drives the stop mode, and maintains the stop mode even if any key of the key matrix 15 is pressed.

4 is a flowchart of a program stored in the microcomputer 14 for carrying out the present invention.

First, the microcomputer 14 is driven in a predetermined mode according to the key of the key matrix 15, and the flowchart shown in FIG. 4 means a subroutine by interruption.

At this time, the humidity sensor 16 inside the VCR measures the humidity in the VCR and applies it to the microcomputer 14, and the microcomputer 14 inputs the humidity of the humidity sensor 16 in step 41.

Then, the microcomputer 14 determines whether the input humidity is a predetermined value, that is, a predetermined reference humidity or more at which the VCR can operate normally (step 42), and proceeds to step 43 when the input humidity is higher than the reference humidity. In step 43, the microcomputer 14 determines whether the predetermined key of the key matrix 15 has been driven, and if so, the microcomputer 14 drives in the mode corresponding to the driven key (step 44). That is, if the humidity in the VCR sensed by the humidity sensor 16 is normal humidity, the microcomputer 14 performs a normal operation of driving in a mode corresponding to the driving key of the key matrix 15.

However, when the determination result of step 42 indicates that the internal humidity of the VCR detected by the humidity sensor 16 is equal to or greater than a predetermined reference humidity, the microcomputer 14 proceeds to step 45 to drive the VCR in the stop mode. . Then, the microcomputer 14 drives the heater 17 embedded in the lower cylinder 22 and returns to step 41.

That is, when the humidity in the VCR is higher than the normal humidity, the microcomputer 14 puts the VCR into the stop mode to prevent the tape from being damaged due to the humidity when the tape is running. The microcomputer 14 drives the heater 17 of the lower cylinder 22 to raise the temperature of the head drum 2 so that the humidity of the head drum 2, that is, dew, can be removed within a short time. .

As described above, the present invention has the effect of forming a heater in the lower cylinder of the head drum and removing the dew in a short time by using the heater when dew is formed on the head drum.

Claims (2)

It consists of an upper cylinder 21 and a lower cylinder 22, the upper cylinder 21 is connected to the rotor 23 through a shaft passing through the lower cylinder 22 to rotate in accordance with the rotation of the rotor 23 In the head drum 2 of the configured video cassette recorder, A video cassette recorder for preventing dew condensation, wherein a heater (17), which is a heating element, is formed in the lower cylinder (22) to selectively raise the temperature of the head drum (2). As a driving method of a video cassette recorder in which a heater 17 is formed in a lower cylinder 22 of a head drum 2, Measuring (41) the humidity of the video cassette recorder; Determining (42) whether the measured humidity is equal to or greater than a predetermined reference humidity; Driving (43) according to a set mode when the measured humidity is equal to or less than the predetermined reference humidity; If the measured humidity is greater than or equal to the predetermined reference humidity, the video cassette for preventing dew condensation has a step (45,46) of driving the heater 17 until it is below the predetermined reference humidity. How to drive the recorder.