JPS6089862A - Tape running system of video tape recorder - Google Patents

Abstract

PURPOSE:To attain miniaturizing and thinning of the profile of the titled device by keeping the relation of position between a magnetic tape and a drum to conduct helical scanning to a prescribed state, and supporting the axial attitude of the drum almost vertical to a mounting reference face of a tape reel. CONSTITUTION:Two tilted guide posts 19-22 are provided respectively to the tape supply side and winding side of the drum 11 the axial attitude of which is set almost vertically to the reference face. The tilted guide posts 19, 22 are provided to a magnetic side of the magnetic tape 2 and the other tilted guide posts 20, 21 are provided to a base side. Then the magnetic tape 2 is run while being wound on the tilted guide posts, a prescribed intake angle and winding angle of the magnetic tape 2 to the drum 11 are obtained, and the tension is distributed almost uniformly in the tape width direction and the tape is run stably without being torsioned along the circumference side face of the drum 11. Thus, the device is miniaturized and the profile is made thin.

Description

[Detailed description of the invention] [Technical portion of the invention! F] The present invention relates to a tape running system of a video tape recorder (hereinafter referred to as VTR) that performs helical scanning using a rotating magnetic head, and in particular, the present invention relates to a tape running system of a video tape recorder (hereinafter referred to as VTR) that performs helical scanning with a rotating magnetic head. The V
The present invention relates to a tape running system that can contribute to making TR devices smaller and thinner.

[Prior Art] Generally, in a helical scan system in a VTR, one or more magnetic heads for recording and reproducing are provided on the peripheral side of a rotatable drum. A magnetic tape, which is a recording medium, is wound around the circumferential surface of the drum at an angle determined by standards with respect to the axial direction of the drum, and the rotating magnetic head scans the tape in an oblique direction to create a magnetized pattern. Its running system is set so as to form a .

Among VTR devices using the helical scan method described above, the caret type V11 device has become particularly popular for home use, and this type of V11 device has been designed to reduce its size by reducing its size. LILQ-formation ``Liquidity'' is one of the selling points (something that is being pursued).

FIG. 1 shows a state in which a magnetic tape is loaded in a cassette type VTR device based on the helical 1-1J system.

In the figure, reference numeral 1 is a cassette, inside which a supply reel 3 and a take-up reel 4, on which a magnetic tape 2 is wound and stored, are arranged at the same height in 0 stages t3.

The magnetic tape 2 is a supply side species゛)-j guide 5,
..., drum '10.1 after 10? ! Various tape guides 12. ..., 1 (3 is wound onto the take-up reel 4 at the eave) J: A sea urchin run ij system is formed 8.

Among these, the magnetic tape 21 running between tape guides 5 to 90 and '13 to 18;
The posture is these tape guides 5・-',) ilJ
J, and 13-18.

Further, the tape guide 10, the drum 11, and the tape guide 12 are provided at an angle with respect to a reference plane in order to perform helical scanning.
1 is inclined to form an oblique magnetization pattern at a certain angle determined with respect to the running direction of the magnetic tape 2,
A tape lead (not shown) that guides the edge of the magnetic tape 2 along its circumferential surface is formed as a stepped portion, so that the magnetic tape 2 is aligned with the axial direction of the drum 11. It is configured to run along its circumferential surface in an inclined direction. Tape guides 10 and 12 are each inclined guide posts, with inclined guide post 1
0, the direction and angle of inclination are set so that the magnetic tape 2, which has been traveling so as to maintain an almost perpendicular attitude with respect to the reference plane, is guided along the tape lead of the drum 11. The guide post 12 has its inclination direction and angle set so as to bring the magnetic tape 2 along the tape lead back to the vertical position 819w1.

Thus, the helical snide 1Pn/j,'ju l
For difficult tape running systems, use the inclined guard C post 9.
, 12 and the relative position and posture with the drum 11 are important factors in recording and reproducing according to standards.

□By the way, in the tape running system, the space occupied by the drum 11 is quite crowded, and the posture of the drum 11 is similar to that of the cassette type Vl'R14.
It can be said that there are two major factors. In this respect, in the above-mentioned configuration (ν), the drum 11 is set at a distance of 1 QLt from the reference plane, so the dimensions of the cassette-type V T li device in the width direction, J: and thickness direction are It was intended to reduce the disadvantage by 1 when downsizing.

[Summary of the Invention] In view of the above-mentioned circumstances, the present invention has been devised to effectively solve the problems. The circumferential side of the drum is set so that it is almost perpendicular to the magnetic tape, and the drum and magnetic tape are set to be approximately perpendicular to each other, and in order to perform a helical scan, the drum and the magnetic tape are set to have a certain square shape between the drum and the magnetic tape. Two inclined guide posts are installed on the tape supply side and take-up side of the drum to guide the magnetic tape along the tape lead in the inclined direction. The present invention provides a tape running system that can contribute to making the VTR device smaller and thinner by disposing it therein.

[Embodiments of the Invention] A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 2 is a plan view showing an embodiment of a tape running system of a VTR according to the present invention, and corresponds to FIG. 1 showing a conventional example. Therefore, for similar components, the numbers shown in FIG. 1 will be used, redundant explanation will be omitted, and the characteristic components of the present invention will be explained.

The drum 11 is provided with its axial direction substantially perpendicular to the reference plane. However, −J(, Kahii・Formula V T
The space occupied by the drum 11 in the R device in the width direction and the space 1, 1, -r in the thickness direction are each drum 1'I
It is possible to reduce the space JjJ in the direction of the base 11ξ, and the space in the direction perpendicular to the reference plane. 1, 2lf (, caret type VT
In the case of R equipment, it is important to achieve miniaturization and thinning of the equipment itself.

If the attitude of the drum 11 is set vertically, the height difference between the supply side and the take-up side will increase in relation to the widthwise position of the magnetic tape 2. The first twist of the magnetic motor 12 is L. In order to absorb this large twist, properly spring (JG) the first opening i'I-pu 2 to the IN side of the drum 11.
19, 20, 2. The other inclined guide posts 20 and 2'
1 is arranged on the LL base surface side. However, the magnetic i'' = 72 is determined by these inclined guide posts 19.20.
By running the magnetic tape 2 wrapped around the tape 21 and 22, the angle of approach and wrapping angle of the magnetic tape 2 to the drum 11 specified by the standards can be obtained, and the tension is distributed almost evenly in the width direction of the tape. It is possible to run stably along the circumferential side of the drum 11 without twisting.

In addition, other tape guides 5. ..., 9 and 14°・
..., 18 are completely similar to the conventional example in their positions and postures.

[Effects of the Invention] As is clear from the above description, the present invention provides the following excellent effects.

However, while maintaining the positional relationship between the magnetic tape and the drum for helical scanning in a constant state specified by the standard, the axial posture of the drum should be approximately perpendicular to the mounting reference plane of the tape reel. By pivotally supporting the drum, the space occupied by the drum can be reduced and the VTR device can be made smaller and thinner.

[Brief explanation of drawings]

Fig. 1 is a plan view showing a conventional example of a -j tape row system of a video tape recorder according to the present invention; It is a plan view (not shown). In the figure, 2 is a magnetic tape, 1' is an upper drum, 19.20.2
1.22 is an inclined blade-C dovost. Agent Masu Oiwa 111th figure 2 continuation correction total (voluntary)! t,)ij'+Mr. Commissioner 1,. Showing 11 items 7.1' Gansho 58-19779
No. 9 2. Name of the invention Tape running system of video tape recorder: 3. Part 5 to the representative of the person making the amendment, Hitoshi Katayama, and the subject of the amendment, Akira? Column 6 of Detailed Description of the Invention in Book III, Contents of Amendment (1) "9" on page 5, line 3 of Specification I is corrected to "10". (2) Correct “host” on page 5, line 9 of the specification to “control.” (3) Correct “the posture of the drum 11” from page 7, line 9 of the HA@ book to line 14 of Dojo. ...in order to wrap it," should be corrected as follows. When the attitude of the drum 11 approaches the vertical state and the drum 11 is turned off, there is a difference in height between the supply side and the take-up side regarding the height position of the magnetic tape 2 in the width direction, and the magnetic tape between the guide posts 9 and 13. The magnetic tape 2 is transferred to the drum 1 by absorbing the twist of the magnetic tape 2.
In order to properly wrap and attach it to the circumferential side of 1, (4) "14" in the 8th negative 7th line of the specification is corrected to "13J."

Claims (1)

[Claims] Helical rotation by means of a rotating magnetic head: 1: In a video tape recorder that performs 'toning', the drum constituting the above-mentioned rotating magnetic head is placed approximately on the mounting reference surface of the tape reel. A magnetic tape is supported on a magnetic tape and runs with the tape surface maintained almost perpendicular to the mounting reference surface. In order to run along the lead, the above equipment ¥ 1
1 Two inclined guide bosses which are erected at an angle with respect to the reference 1ii are provided on each of the tape supply side and the winding side of the drum, and each of these two inclined guide bosses I- is connected to the magnetic tape of the magnetic tape. A tape running system for a video tape recorder, characterized in that one tape is provided on each of the front side and the base ini side.