JPH031347A - Dew removing device for head drum in vtr or the like - Google Patents

Abstract

PURPOSE:To remove the dew of a head drum with lower electric power consumption without requiring a space for installation by blowing heated hot wind through an aperture of a casing in a loaded state to a head drum. CONSTITUTION:The reel shaft of this VTR is inserted into holes 15, 16 of the casing 14 when a cassette is loaded. An operating element 26 is then pressed by the insertion of this reel shaft into the hole 15 and a switch 25 is turned on. The power source currents of batteries 23, 24 are, therefore, supplied to a heater 20 and a motor 22 from the batteries and the wind is sent from the aperture 18 in an arrow direction toward the aperture 17 by a fun 21. The wind is heated by the heater 20 and is blown as the hot wind from the aperture 17 toward the head drum, by which the dew of the head drum is removed. The dew of the head drum is removed in this way with the lower electric power consumption without forming the apparatus to larger sizes.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is directed to a cassette VTR (video tape recorder).
The present invention relates to a device for removing dew from a head drum of a device equipped with a head drum, such as a DAT (digital audio recorder) or the like.

[Prior Art] In general, VTRs that have a rotating head (1) and a head drum that guides a magnetic tape, for example, in the winter, when the VTR is brought into a warm room rather than outside in the cold. It is known that when the temperature of a VTR changes rapidly, dew forms on the head drum.

Conventionally, a device shown in FIG. 3 is known as a device for removing this dew. FIG. 3 shows the head drum of a VTR, and the head drum 1 is composed of a rotating drum 3 having a head chip 2 and a fixed drum 4. As shown in FIG. Reference numeral 5 is a dew condensation sensor, which is attached to the fixed drum 4.
It is attached to the stationary drum and detects the presence of dew based on the electrical resistance that changes depending on the moisture on the surface of the fixed drum.

Reference numeral 6 denotes a heater, which is attached to the fixed drum 4 so that when the dew condensation sensor 5 detects dew, a heating current automatically flows to remove dew from the head drum 1. It has become.

[Problems to be Solved by the Invention] By the way, in the case where the head drum 1 is heated by the heater 6 provided on the fixed drum 4 to remove dew as described above, the rotary drum 3 must also be heated by the heater 6. Therefore, there was a drawback that power consumption for heating increased. This drawback becomes noticeable in portable devices that use batteries as a power source.

In order to eliminate this drawback, a blowing means and a heating means for heating the air sent by the blowing means are provided near the head drum 1, and warm air heated by the heating means is blown onto the head drum l. It is also possible to add one.

However, in order to blow hot air in this way, a space is required in which the blowing means and the heating means are installed near the head drum l. Providing such a space increases the size of the device, which is particularly undesirable in the case of portable devices.

The present invention eliminates the above-mentioned drawbacks and provides a head drum dew removal device for a VTR or the like, which can remove dew from the head drum with low power consumption and without increasing the size of the device.

[Means for Solving the Problems] In order to solve the above problems, the present invention has an external shape that can be loaded into a cassette loading section of a cassette VTR, etc., and when loaded in the loading section. The device includes a housing having an opening on the side facing the head drum of a VTR, etc., and a blowing means and a heating means built into the housing, and hot air sent from the blowing means and heated by the heating means is heated to the loaded state. The blower is configured to be able to blow onto the head drum through the above-mentioned opening of a certain housing, and the housing has a built-in power source for the blowing means and the heating means, and the housing has a built-in power source for the blowing means and the heating means. A power switch is provided for supplying power current from the power source to the blowing means and heating means when a reel shaft of a cassette VTR or the like is inserted.

[Function] In the head drum dew removal device for a VTR or the like configured as described above, by loading this dew removal device into the cassette loading section of the VTR or the like, the dew removal device is installed in the casing of the VTR or the like. The reel shaft is inserted and the power switch is turned on. When this power switch is turned on, a power supply current is supplied to the air blowing means and the heating means, and hot air from the air blowing means heated by the heating means is blown onto the head drum of a VTR or the like through the frontage of the housing. , the dew on the head drum is removed.

[Example] An example of the present invention will be described below with reference to the drawings. Figure 1 shows the outline of the configuration of the dew removal device, and the second
The figure shows this dew removal device installed in a camera-integrated VTR. In FIG. 2, reference numeral 7 denotes a well-known camera-integrated VTR, which includes a lens 8, a microphone 9, a finder 1O, and the like. A part of the casing of the VTR 7 is shown cut away, and parts of the rotary drum 11 of the built-in head drum and tape guides 12 and 13 are visible. Reference numeral 14 designates a housing of the dew removal device of the present invention, which is shown loaded in a well-known cassette loading section of a VTR 7.

This housing 14 is a housing for a cassette used in this VTR 7 (
It has substantially the same shape as (not shown). This case 1
4 is a hole 15, 16 into which a reel shaft (not shown) is fitted during loading into a VTR, as shown by the chain line in FIG.
The head drum (rotating drum 11) when loaded into the TR
It has a frontage 17 provided on the side facing toward the frontage and a frontage 18 provided on the opposite side, and an air passage 19 from the frontage 17 to the frontage 18 is formed. A heater (heating means) 20 made of a heating wire is installed near the frontage 17 in this passage 19, and a motor (air blowing means) 22 having a fan 21 is installed near the opening 18.
is installed. Reference numerals 23 and 24 indicate batteries that serve as a power source for the heater 20 and the motor 22, and are housed in the housing 14. Reference numeral 25 is a microswitch attached to the housing 14, and the switch is connected to the battery 23.2.
4 serves as a power switch that supplies power current to the heater 20 and motor 22. This switch 25
has an operating element 26 made of a plate spring, which reaches a part of the hole 15.

A case where the dew removal device configured as described above is used will be described. When this dew removal device is loaded into the above-mentioned cassette loading section of the VTR in the same way as loading a well-known cassette, the reel shaft of the VTR is inserted into the hole 1 of the housing 14.
Inserted in 5.16. By inserting the reel shaft into the hole 15, the operator 26 is pressed and the switch 25 is turned on. When this switch 26 is turned on, the batteries 23 and 24 are connected to the heater 20 and the motor 2.
2 is supplied with the power supply current. As a result, heater 2
0 is heated and the motor 22 is rotated. The fan 21 driven by the rotation of the motor 22 sends air in the direction of the arrow from the opening 18 toward the opening 17, and this air is heated by the heater 20 and becomes warm air.

This warm air is blown toward the head drum from the opening 17, thereby removing dew from the head drum.

After this dew has been removed, the dew removing device is removed from the cassette loading section in the same manner as in the case of a known cassette, and the reel shaft is removed from the hole 15 of the housing 14.
As a result, the pressure exerted by the reel shaft on the operator 26 is released,
The switch 25 is turned off, cutting off the electrical current from the batteries 23, 24 to the heater 20 and motor 22.

Incidentally, in the above embodiment, explanation has been given of a camera-integrated VTR that removes the dew, but the invention is not limited to this.
This can also be done for stationary VTRs and DATs.

Further, in the above embodiment, the insertion of the reel shaft into the hole 15 is detected to detect that the housing 14 is loaded, and the power supply current is thereby supplied. However, the present invention is not limited to this. The housing 14 may be provided with a movable protrusion that is pressed by a known cassette holder when the housing 14 is held in the cassette holder, and the power switch is turned on when the protrusion is pressed.

Further, in the above embodiment, the power supply current is automatically supplied when the dew removal device is loaded, but a manual power switch is provided in the housing 14, and the power supply current is supplied by manual operation. Good too.

Further, in the above embodiment, the motor 22 causes the fan 21 to
However, the driving force is obtained from the reel shaft of a VTR, etc.
The fan 21 may be driven by this.

[Effects of the Invention] As described above, the present invention has a cassette having an external shape that can be loaded into a cassette loading section of a VTR, etc., and a frontage on the side facing the head drum of the VTR etc. when loaded in the loading section. (frontage part 17), a blowing means such as a fan 21 and a heating means such as a heater 20 built into the case, and the temperature that is sent from the blowing means and heated by the heating means is provided. Since the wind is blown onto the head drum through the opening 17 of the housing 14 in the loaded state, dew on the head drum can be removed with less power consumption and without requiring any installation space. Can be removed.

The housing 14 also includes the air blowing means (motor 22).
and a power switch (switch 25) which has a built-in power supply for the heating means and supplies power current from the power supply to the blowing means and heating means when the reel shaft of the cassette VTR or the like is inserted into the housing. By loading this dew removal device into a VTR or the like, power supply current is automatically supplied, warm air is blown onto the head drum, and dew is removed.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a schematic configuration of an embodiment of the present invention, Fig. 2 is a partially cutaway perspective view showing the state of use of the device shown in Fig. 1, and Fig. 3 is a front view showing a conventional example. be. 11: Rotating drum, 14: Housing, 17: Frontage, 20:
Heater, 21: Fan, 22: Motor 23.24:
Battery, 25: Switch.

Claims (2)

[Claims] (1) A casing that has an external shape that can be loaded into a cassette loading section of a cassette VTR, etc., and is open on the side facing the head drum of the VTR, etc. when loaded in the cassette loading section; A built-in air blowing means and a heating means are provided, and warm air sent from the air blowing means and heated by the heating means is blown onto the head drum through the opening of the housing in the loaded state. A head drum dew removal device for a VTR, etc., characterized by the following. (2) The housing has a built-in power source for the air blowing means and heating means, and when the reel shaft of the cassette VTR or the like is inserted into the housing, power is supplied from the power source to the air blowing means and heating means. 2. The head drum dew removal device for a VTR or the like according to claim 1, further comprising a power switch for supplying current.