JPH0668864B2 - Tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The tape recorder of the present invention will be described in accordance with the following items.

A. Industrial field of use B. Summary of invention C. Prior art C-1. General background C-2. Conventional tape loading post D. Problems to be solved by the invention E. To solve problems Means F. Example a. Tape cassette [Fig. 1] b. VTR [Fig. 1] b-1. Head drum [Fig. 1, Fig. 2] b-2. Tape loading post [Fig. 1, Fig. 2] b-3. Other members [Fig. 1] c. Mounting of tape cassette d. Tape loading e. Tape path after completion of tape loading f. Recording and playback G. Effects of the invention (A. Industrial The present invention relates to a novel tape recorder. For more information,
Video tape recorder (hereinafter referred to as "VTR") or so-called PCM (pulse code modulation)
Audio tape recorder by recording method (hereinafter,
Called "DAT". ) A head drum provided with an equal rotating magnetic head is provided, and recording or reproducing on / from a magnetic tape is performed in a state in which a part of the magnetic tape is wound around the head drum in a predetermined winding angle substantially in a spiral shape, In particular, the present invention relates to a tape recorder having a relatively small wrap angle of about 90 ° to 180 °, and when the magnetic tape is wound on the head drum, the tape winding of the head drum is started at a position where the tape wrapping is started. At least one of the tape loading post that is moved close to the tape loading post and the tape loading post that is moved near the position where the tape winding of the head drum is finished can be in a form that does not require high accuracy in the positioning and the like. It is intended to provide a new tape recorder that does so.

(B. SUMMARY OF THE INVENTION) The present invention is provided with a head drum provided with a rotary magnetic head, and recording or reproducing to or from a magnetic tape is performed by forming a part of the magnetic tape around the head drum in a predetermined spiral shape. When a magnetic tape is wound around a head drum, particularly when a magnetic tape is wound around a head drum, particularly in a tape recorder having a relatively small winding angle of about 90 ° to 180 °. Not using a so-called inclined guide post for at least one of the tape loading post moved near the position where the tape winding is started and the tape loading post moved near the position where the tape winding of the head drum is ended, This type of tape recorder has a simple tape loading post and positioning means for it. It is obtained to be able to structure.

(C. Prior Art) (C-1. General Background) In a VTR or DAT, a VTR or DAT is usually provided with a rotary magnetic head, and its axial direction is predetermined with respect to a direction perpendicular to a predetermined reference plane such as VTR. Is provided with a head drum tilted at an angle, and for recording or reproducing the contents recorded on the magnetic tape, the magnetic tape is pulled out from the tape cassette mounted on the VTR or the like and the head drum is provided with a predetermined amount. It is designed to be wound in a substantially spiral shape at a winding angle.

The magnetic tape is pulled out from the tape cassette and wound around the head drum, that is, the tape is loaded by a predetermined tape loading mechanism. That is, this tape loading mechanism is provided so as to be movable with respect to the chassis, and when the tape cassette is mounted, the tape loading mechanism is located inside the tape pull-out surface of the tape cassette, that is, outside the cassette case. A plurality of tape loading posts located inside are provided, and the magnetic tape is pulled out from the tape cassette by moving the tape loading posts to a predetermined position close to the head drum, and a part of the magnetic tape is ejected from the head drum. It is configured to be wrapped around.

(C-2. Conventional tape loading post) By the way, there are several types of tape loading mechanisms such as these, one of which is the so-called "M type loading system". There is one. In the tape loading by this type of tape loading mechanism, the above-mentioned tape loading post is moved across the head drum to a substantially symmetrical position so that the loaded magnetic tape is passed through a substantially M-shaped tape path. It is like this.

Therefore, according to the tape loading mechanism of such a system, the tape loading post, the magnetic tape, and the like do not wrap around to the rear side of the head drum, which has the advantage that the depth of the VTR or the like can be made relatively short. is there.

(D. Problems to be Solved by the Invention) By the way, the tape loading mechanism based on the above-mentioned M-type loading method is disclosed in, for example, Japanese Patent Publication No. 59-46064. An inclined guide post, that is, a guide post whose axial direction is inclined at a predetermined angle in a predetermined direction with respect to a direction perpendicular to a reference plane such as a VTR is used for both the ones that are moved to the left and right.

That is, the magnetic tape must be held in a direction parallel to the vertical direction at the tape withdrawing position of the tape cassette, and since it is wound in a substantially spiral shape with respect to the head drum, at least this area of the head drum is A position before the position where the tape winding is started with respect to the tape (hereinafter, referred to as “tape winding start position”) and a position where the tape winding with respect to the head drum is ended (hereinafter, referred to as “tape winding”). End position "), the tape surface of the head drum needs to have the same inclination as the winding start position and the winding end position of the head drum.
In this case, if the tape path between the tape withdrawing position of the tape cassette and the tape winding start position and the tape winding end position of the head drum is long, the tape can be twisted little by little during that time. Since the tape path by the mold loading method is relatively short, it is difficult to twist the magnetic tape little by little during this. Therefore, the tape surface must be inclined at a position immediately before the tape winding start position of the head drum and a position immediately after the tape winding end position. Therefore, in the tape loading mechanism of the M-type loading system, the inclined guide posts are used for all the tape loading posts that are moved to the left and right sides of the head drum.

Due to the function of the inclined guide post, it is necessary that the inclination direction, the inclination angle, and the like in the state where the tape loading is completed are extremely accurately expressed. For this reason, this type of tape loading mechanism is provided with a positioning means having an extremely complicated structure for positioning the inclined guide post in the loading completed state.

Therefore, these inclined guide posts and positioning means are
This is an obstacle in increasing the component placement density of VTRs, etc., and also causes the cost to be high.

(E. Means for Solving Problems) By the way, the angle of the portion of the magnetic tape at the tape winding start position and the tape winding end position of the magnetic tape with respect to the vertical direction (hereinafter, “tape twist angle”). Generally has the following correlation with the tape wrap angle with respect to the head drum. That is, the smaller the tape winding angle with respect to the head drum, the smaller the tape twist angle.

Therefore, in order to solve the above-mentioned problems, the tape recorder of the present invention, in view of the above correlation, uses a magnetic tape in a tape recorder in which the winding angle of the magnetic tape with respect to the head drum is about 90 ° to 180 °. When the tape is wound around the head drum, at least one of the tape loading post that is moved to the tape winding start position side of the head drum and the tape loading post that is moved to the tape winding end position has an axial direction substantially parallel to the axial direction of the tape reel. It is configured only by a flanged guide roller portion extending in the direction.

Therefore, according to the present invention, highly accurate positioning or the like is required for at least one of the tape loading post that is moved to the tape winding start position side and the tape loading post that is moved to the tape winding end position side of the head drum. Since it is not necessary to use a so-called inclined guide post, the tape loading mechanism can have a simpler structure.

(F. Examples) The details of the tape recorder of the present invention will be described below with reference to the examples shown in the accompanying drawings.

In the embodiment shown in the drawings, the tape recorder of the present invention is
It is applied to R.

In addition, the description will be given first on an example of a tape cassette used for a VTR, and thereafter on each part of the VTR.

(A. Tape cassette) [Fig. 1] 1 is a tape cassette detachably mounted on a VTR described later (in the drawing, it is shown mounted on a VTR described later, and its horizontal section is shown). It is).

Reference numeral 2 is a cassette case of the tape cassette 1. The cassette case 2 is formed in a relatively thin, substantially box shape, and the front surface thereof, that is, the surface facing upward in FIG. 1 is the tape pull-out surface. Denoted at 3 is a tape pull-out recess formed in a portion of the tape pull-out surface excluding the left and right ends thereof. The tape pull-out recess 3 has a depth of about one third of the length of the cassette case 2 in the front-rear direction. Have. Reference numerals 4 and 5 denote tape outlets formed at both left and right ends of the tape pulling surface of the cassette case 2, and the tape guides 6 in the cassette are provided on the inner side surfaces of the tape outlets 4 and 5 near the tape pulling recess 3.
And 7 are formed.

Reference numeral 8 denotes a front lid for opening and closing the tape pull-out surface of the cassette case 2. The front lid 8 is in a position to close the tape pull-out surface until the tape cassette 1 is mounted on the VTR. When the cassette 1 is mounted at a predetermined cassette mounting position of the VTR, it is moved to a position where the tape pulling surface is opened as shown in FIG.

Reference numerals 9 and 10 denote tape reels rotatably housed in the cassette case 2. These two tape reels 9 and
The left side 9 of the 10 is the supply side tape reel (hereinafter,
Say "S reel". ), And the right one 10 is a take-up side tape reel (hereinafter referred to as "T reel"). 11 and
12 is a reel hub for the tape reels 9 and 10.

13 is a magnetic tape. Both ends of the magnetic tape 13 are separately fixed to the tape reels 9 and 10, and a predetermined amount is wound, and the tape cassette 1 is attached to the VTR by a chain double-dashed line in FIG. Passed through the path shown. That is, in this state, the magnetic tape 13 is pulled out from the S reel 9, is led out from the tape outlet 4 on the left side of the cassette case 2 to the outside of the cassette case 2, and is passed through the tape pulling surface, and the tape outlet 5 on the right side. It is introduced into the cassette case 2 and wound on the T reel 10.
The path of the portion of the magnetic tape 13 that is led out of the cassette case 2 is restricted by the tape guides 6 and 7 in the cassette.

(B.VTR) [Fig. 1] 14 is a VTR and 15 is its mechanical chassis.

(B-1. Head Drum) [FIGS. 1 and 2] 16 is a head drum provided at the rear end of the upper surface of the mechanical chassis 15. The head drum 16 is composed of a lower drum 17 fixed to the mechanical chassis 15 and an upper drum 19 fixed to a rotating shaft 18 rotatably supported by the lower drum 17, and a lower end surface of the upper drum 19 is provided. A magnetic head (not shown) for recording and reproducing is attached to a position near the outer peripheral edge of the.
The lower drum 17 and the upper drum 19 have diameters that are substantially equal to each other and are arranged coaxially with each other, and the axial direction thereof is a predetermined direction toward the left side with respect to the direction perpendicular to the mechanical chassis 15. It is tilted at an angle.

(B-2. Tape loading post) [Figs. 1 and 2
[Fig.] 20, 21 and 22 are tape loading posts, and the leftmost one of these three tape loading posts 20, 21 and 22 is the first tape loading post and is located in the middle. Item 21 is the second tape loading post, and item 22 on the far right is the third tape loading post.

The second tape loading post 21 is erected from a moving base (not shown), and its axial direction is inclined to the left rearward by a predetermined angle at the position when the tape loading is performed. Has been done.

The first tape loading post 20 and the third tape loading post 22 have a roller structure. That is, 23 and 23 'are support shafts vertically erected from a moving base (not shown), and the support shafts 23 and 23' are rotatably supported by rollers 24 and 24 'made of a material having a good smoothness. And the flanges 25, 25 and 25 ', 25' located in contact with the upper and lower ends of the rollers 24, 24 'are supported shafts.
It is fixedly provided on 23 and 23 '.

Each of the first, second and third tape loading posts 20, 21 and 22 is in a position before the tape loading is performed, and the position is indicated by a chain double-dashed line in FIG. 1 (hereinafter, "non-loading position"). When the tape loading is performed, the first
The position shown by the solid line in the figure (hereinafter referred to as "loading completion position")
Say ) Has been moved to.

(B-3. Other members) [Fig. 1] 26 is a tape guide provided at a position apart from the head drum 16 to the left of a portion of the mechanical chassis 15 near the left end edge, and 27 is a mechanical chassis 15. It is a capstan that is provided so as to project from a position that is separated from the head drum 16 in a diagonally forward right direction.

28 is a pinch roller, 29 is a ten pin, and 30 and 31 are feeding guides.
In the state before tape loading is performed, 29 and the feeding guides 30 and 31 are respectively at the positions indicated by the two-dot chain line in FIG. 1 (hereinafter referred to as "non-loading positions"), and tape loading is performed. And each first
The position shown by the solid line in the figure (hereinafter referred to as "loading completion position")
Say ) Has been moved to.

(C. Mounting of Tape Cassette) Then, the above-mentioned tape cassette 1 is mounted on the VTR 14 at the position shown in FIG. This mounting is performed by a cassette mounting mechanism (not shown). And ...
While the tape cassette 1 is mounted in such a position of the VTR 14, its front cover 8 is moved to a position where the tape pull-out surface of the cassette case 2 is opened.

(D. Tape loading) When the tape cassette 1 is mounted on the VTR 14, the tape loading posts 20, 21, 22, the pinch roller 28, the tenon pin 29, and the feeding guides 30, 31 are all relatively in the cassette case 2. Will be located in the tape pull-out recess 3.

Therefore, when a command for tape loading is issued from this state, the tape loading posts 20, 21 and 22
Is moved to the loading completion position described above. That is, the first tape loading post 20 is the head drum.
The second tape loading post 21 is moved to a position slightly separated from the head drum 16 on the substantially left side of the 16, and the second tape loading post 21 is moved to a position closer to the head drum 16 which is closer to the front than the first tape loading post 20. Further, the third tape loading post 22 is moved to a position on the substantially right side of the head drum 16 and separated from the head drum 16 by a small distance.

And along with this, pinch roller 28, ten-legged pin
29 and the feeding guides 30, 31 are moved to the above-mentioned loading completion position. That is, the pinch roller 28 is moved to the position where the magnetic tape 13 is sandwiched between the pinch roller 28 and the capstan 27 and the push-out guides 30 and 31 are individually moved to the positions behind the tape outlets 4 and 5 of the cassette case 2. Further, the balance pin 29 will be moved to a position approximately in the middle between the swing-out guide 30 and the tape guide 26 on the left side.

(E. Tape path after completion of tape loading) Then, when tape loading is performed, a part of the magnetic tape 13 is pulled out from the cassette case 2, and the pulled out portion is as shown by a solid line in FIG. You will be passed through the pass. That is, in this state, the magnetic tape 13 is pulled out from the S reel 9 and led out of the cassette case 2 from the tape outlet 4 on the left side, and then, first, the feeding guide 30-tenuregi pin 29-tape guide 26-first. The tape is wound around the roller 24 of the tape loading post 20 in this order, and is folded back from the position where it is wound around the roller 24 of the first tape loading post 20 in a diagonally right forward direction. The magnetic tape 13 is wound around the second tape loading post 21, that is, the inclined guide post, so that the tape surface of the magnetic tape 13 becomes the head drum 16.
The head drum 16 is tilted so that it is approximately in the same direction as the tape winding start position on the outer peripheral surface of the head drum 16.
A wrapping angle of about ゜ goes around. At this time, the magnetic tape 13 is wound with its one end edge in the width direction being in contact with the lead 32 (see FIG. 2) formed over the outer peripheral surface of the lower drum 17 at about 90 °, The winding position of the head drum 16 in the height direction is restricted.

Then, the magnetic tape 13 is separated from the head drum 16 at the tape winding end position of the head drum 16, and is first wound around the roller 24 'of the third tape loading post 22.
From here, it is folded back substantially forward, passed between the capstan 27 and the pinch roller 28, and wound around the right-side feed guide 31 and then introduced into the cassette case 2 from the tape outlet 5 on the right side, and the T reel. It gets rolled up to 10.

In the tape path described above, there is a twist between the tape surface of the magnetic tape 13 at the tape winding end position of the head drum 16 and the tape surface at the portion wound around the third tape loading post 22. Since the tape winding angle with respect to the head drum 16 is approximately 90 °, the angle of twist is very small.

(F. Recording and Reproduction) Recording on the magnetic tape 13 or reproduction of the content recorded on the magnetic tape 13 is performed with the magnetic tape 13 passing through the tape path described above.

That is, when a command for recording or reproducing is issued from this state, the capstan 27 is rotated in the counterclockwise direction, and the upper drum 19 of the head drum 16 is rotated in the counterclockwise direction in FIG. To be done. As a result, the magnetic tape 13 is run, and the magnetic head (not shown) attached to the upper drum 19 is rotated while being in contact with the portion of the magnetic tape 13 that is wound around the head drum 16. Recording while forming a predetermined track on the magnetic tape 13 or reproduction while tracing the track is performed.

As described above, there is a slight twist between the tape surface of the magnetic tape 13 at the tape winding end position of the head drum 16 and the tape surface of the portion wound around the third tape loading post 22. , Magnetic tape 13
When the magnetic tape 13 travels, a moving force for moving the magnetic tape 13 upward is applied to this portion, and the movement of the magnetic tape 13 due to this is caused by the flange 25 provided on the third tape loading post 22. , 25 'will be blocked by the upper one.

(G. Effect of the Invention) As is clear from the above description, the tape recorder of the present invention accommodates the tape reel wound with the magnetic tape and a part of the magnetic tape is the tape pull-out surface of the cassette case. And a tape drum which is equipped with a rotating magnetic head and whose axial direction is tilted at a predetermined angle with respect to the axial direction of the tape reel, for recording or reproducing on the magnetic tape. Is performed with a part of the magnetic tape wound around the head drum by about 90 ° to 180 °, and the magnetic tape is wound around the head drum relatively inside the tape pull-out surface when the tape cassette is mounted. And is moved from that state to a position close to the tape winding start position and the tape winding end position of the head drum. Of a tape loading post that is moved by the tape loading post of the head drum when the magnetic tape is wound around the head drum, and a tape loading post that is moved to the tape winding end position of the head drum. One of the features is that only one of the guide rollers is provided with a flange, the axial direction of which extends substantially parallel to the axial direction of the tape reel.

Therefore, according to the present invention, highly accurate positioning or the like is required for at least one of the tape loading post that is moved to the tape winding start position side and the tape loading post that is moved to the tape winding end position side of the head drum. Since there is no need to use a so-called tilted guide post, the tape loading mechanism in this type of tape recorder can be made a simpler structure, and
The VTR component placement density can be increased.

In the above-described embodiment, only the tape loading post which is moved to the tape winding end position side of the head drum is constituted only by the guide roller whose axial direction extends substantially parallel to the axial direction of the tape reel. However, in some cases, it is conceivable that only the tape loading post that is moved to the tape winding start position side of the head drum is used as the guide roller as described above. Further, it is conceivable that both the tape loading post that is moved to the tape winding start position side of the head drum and the tape loading post that is moved to the tape winding end position side are configured by only such guide rollers. .

Although the tape winding angle with respect to the head drum is about 90 ° in the above-described embodiment, the present invention has a tape winding angle with respect to the head drum of about 90 ° to 18 °.
It can be applied to those having an angle of about 0 °.

[Brief description of drawings]

The drawings show an example in which the tape recorder of the present invention is applied to a video tape recorder. FIG. 1 is a plan view showing a state in which a tape cassette is mounted, and FIG. 2 is a magnetic state in which a tape is loaded. It is a conceptual diagram which expands and shows a part of tape on the plane. Explanation of symbols 1 …… tape cassette, 2 …… cassette case, 9,10 …… tape reel, 13 …… magnetic tape, 14 …… tape recorder, 16 …… head drum, 22 …… flange guide roller section, 24 ′ …… Guide roller, 25 ′ …… Flange

Claims (1)

[Claims] 1. A tape cassette in which a tape reel around which a magnetic tape is wound is housed and a part of the magnetic tape is passed through a tape pull-out surface of a cassette case is mounted, and a rotary magnetic head is provided. A head drum whose axial direction is tilted at a predetermined angle with respect to the axial direction of the tape reel is provided. When recording or reproducing the magnetic tape, a part of the magnetic tape is approximately 90 ° to 18 ° to the head drum.
The magnetic tape is wound around the head drum at about 0 ° and is positioned relatively inside the tape pull-out surface when the tape cassette is loaded, and from that state, the tape winding start position of the head drum. Also, in a tape recorder having a plurality of tape loading posts that are moved to positions respectively close to the tape winding end position, when the magnetic tape is wound around the head drum, the magnetic tape is moved to the tape winding start position side of the head drum. A tape characterized in that at least one of the tape loading post and the tape loading post that is moved to the tape winding end position is constituted only by a flanged guide roller portion whose axial direction extends in a direction substantially parallel to the axial direction of the tape reel. recorder