JP2506664Y2 - Tape guide - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The tape guide of the present invention will be described in detail according to the following items.

A. Industrial field of use B. Overview of the device C. Prior art [Fig. 8] a. General background b. One example of conventional tape guide [Fig. 8] D. Problems to be solved by the device [Fig. Fig. 8] E. Means for solving the problem F. Embodiment [Figs. 1 to 7] F-1. First embodiment [Figs. 1 to 5] a. Magnetic head, head holder b. Tape guide b-1. Structure b-2. Function F-2. Second embodiment [Fig. 6] F-3. Third embodiment [Fig. 7] G. Effect of device (A. TECHNICAL FIELD The present invention relates to a novel tape guide. More specifically, for example, a tape guide of a magnetic head device provided in a fixed head type audio tape player or the like, that is, a tape path for a magnetic head of a magnetic tape that is arranged on one side or both sides of the magnetic head in the tape running direction. A tape guide for regulating the tape, in particular, when the tape runs, a moving force in the width direction is urged to bring one side edge of the tape into contact with the tape path reference portion, thereby regulating the tape path. The tape guide can improve the apparent rigidity of the tape by devising the width in the tape running direction of the tape contact surface and the tape path reference portion with which the tape contacts from the thickness direction. The strength per unit area of the pressing force with which one side edge of the tape is pressed against the tape path reference portion can be reduced, Les by, is intended to provide a novel tape guides to be able to prevent the occurrence of so-called tape curling one side edge of the tape will be wound in the width direction.

(B. Outline of the Invention) The tape guide of the present invention urges the width of the tape contact surface and the tape path reference portion in the tape traveling direction, that is, the inclined portion, that is, the moving force to the tape path reference portion side to the tape. By increasing the width of the biasing inclined portion in the tape running direction for increasing the apparent rigidity of the tape, one side edge of the tape is pressed against the tape path reference portion per unit area of the pressing force. Try to reduce the strength so that one side edge of the tape, even when using thin tape or when the tape path is significantly misaligned with the tape guide in the tape width direction. It is possible to prevent curling or breaking of the.

(C. Prior Art) [Fig. 8] (a. General Background) In a tape player, it is important that the contact state between the magnetic tape and the magnetic head be accurately matched during recording and during reproduction. In particular, if the angle between the width direction of the magnetic tape and the gap of the magnetic head (hereinafter referred to as “head gap”) in the track width direction does not match during recording and during reproduction, so-called azimuth loss occurs. As a result, the reproduction output is significantly reduced.

For this reason, for example, in a fixed head type audio tape player, a tape guide is arranged on one side or both sides of the magnetic head in the tape running direction, and the tape guide allows relative movement between the magnetic tape and the magnetic head. A contact state, in particular, the tape path is regulated so that the position and the inclination of the magnetic tape with respect to the track width direction of the head gap are always constant, and
Such regulation is usually made so that the width direction of the magnetic tape and the track width direction coincide with each other, and such a tape guide is provided integrally with the magnetic head.

A tape guide of this type generally includes a tape contact surface with which the magnetic tape contacts in the thickness direction and two guide portions protruding from both ends of the tape contact surface in the tape width direction. The position of the magnetic tape in the track width direction of the head gap is regulated by contacting both side edges of the magnetic tape with the guide portion.

(B. An example of a conventional tape guide) [Fig. 8] By the way, when a magnetic tape runs in such a tape guide, a moving force in the width direction is urged to the magnetic tape, so There is one in which the side edge is pressed against one of the two guide portions (may be referred to as "azimuth automatic adjustment type tape guide").

FIG. 8 shows an example of such a tape guide.

In the figure, a is a magnetic head and b is the magnetic head a.
Tape contact surface, c, c is a head core provided so that its front end surface is located on the tape contact surface b, d, d are head gaps, e is a head holder holding the magnetic head a, and f, f Is a head holder b that serves as a tape guide
At the front end portions of the left and right side walls g, g of the tape, and the tape guides f, f are in contact with the tape contact surfaces h, h extending in the height direction thereof, that is, along the track width direction of the head gaps d, d. The tape path reference planes i, i projecting vertically from the upper ends of the faces h, h and the biasing slopes j, j projecting from the lower ends of the tape contact faces h, h to the front oblique lower side. However, the tape contact surfaces h, h have a height slightly shorter than the width of the magnetic tape k. Therefore, when the magnetic tape k comes into contact with the tape contact surfaces h, h, the lower side portion 1 of the magnetic tape k contacts the biasing slope j. ,
You will be in contact with j.

Then, when the magnetic tape k runs, the magnetic tape k is biased by the moving force toward the tape path reference planes i and i, so that the upper edge m thereof is located at two positions on the left and right sides of the magnetic head a. It is pressed against the tape path reference planes i, i, whereby the positions of the head gaps d, d of the traveling magnetic tape k with respect to the track width direction are stably maintained, and the tape width direction and the head gaps d, d are held. Will always match the track width direction.

(D. Problem to be solved by the device) [FIG. 8] However, in such tape guides f and f, if the magnetic tape k to be used is extremely thin, its rigidity is weak, The tape path reference planes i, side portions n on the side pressed against i may be curled or bent as shown by a two-dot chain line in FIG. 8 (B).
When such a situation occurs, the position of the magnetic tape k with respect to the magnetic head a in the tape width direction is displaced or the tape width direction is inclined with respect to the track width direction of the head gaps d and d. , F are not played at all, and dropout occurs in recording and reproduction of signals, and the magnetic tape k is seriously damaged, resulting in various accidents.

(E. Means for Solving the Problem) Therefore, in order to solve the above-mentioned problems, the tape guide of the present invention urges the width of the tape contact surface and the tape path reference portion in the tape traveling direction to urge the inclined portion in the tape traveling direction. It is wider than the width of.

Therefore, according to the tape guide of the present invention, the total force of pressing the tape against the tape path reference portion is the same as the total movement force of the biasing inclined portion, but one side edge of the tape is pressed. Since the width of the tape path reference portion is larger than the width of the biasing inclined portion, the pressing force with which one side edge of the tape is pressed against the tape path reference portion is applied to the portion of the one side edge that is in contact with the tape path reference portion. Since the pressing force per unit area (length) of one side edge of the tape is dispersed and the width of the tape contact surface is larger than the width of the biasing inclined portion, the tape path reference portion of the tape is dispersed. The position in the thickness direction of the portion corresponding to the one side edge abutting on the tape is stabilized and the apparent rigidity is increased. With these, a sufficient moving force to the tape path reference portion side is applied to the tape. While tape Side edges that are in contact with the scan reference portion can be prevented from being broken or curled by the moving force.

(F. Embodiment) [FIGS. 1 to 7] The details of the tape guide of the present invention will be described below with reference to the embodiments.

In each of the illustrated embodiments, the present invention is applied to a tape guide in a tape guide integrated type magnetic head device provided in an audio tape player.

(F-1. First Embodiment) [FIGS. 1 to 5] FIGS. 1 to 5 show a first embodiment of the tape guide of the present invention.

(A. Magnetic Head, Head Holder) 1 is a magnetic head device, and the magnetic head device 1 comprises a magnetic head and a head holder holding the magnetic head.

Reference numeral 2 is a magnetic head, and a shield case 3 and head cores 4, 4 ...
.. (the head cores 4, 4, ... and the shield plates 5, 5, ... Only the front end face thereof is shown. )
And a coil (not shown) wound around the head cores 4, 4, ..., And the front end faces of the head cores 4, 4, ... And the shield plates 5, 5, ... Are the tape contact faces of the shield case 3. It is provided on the front surface 3a so as to be arranged on the front surface 3a.

The head gaps 4a, 4a, ... Are formed so that the track width direction is along the height direction of the tape contact surface 3a of the shield case 3.

Reference numeral 6 denotes a head holder, which includes a base portion 7 in the shape of a prism that is long in the left-right direction and a holding portion 8 having a substantially rectangular frame shape when viewed from the front-rear direction with a portion excluding both left and right end portions of the base portion 7 as the bottom portion. The left and right side walls 9, 9 of the holding portion 8 are integrally formed of a synthetic resin, and the front portions of the left and right side walls 9, 9 are formed so as to project forward from the remaining portion of the holding portion 8. 2 is held so as to be fitted.

Reference numeral 10 denotes a head base that is pushed toward the magnetic tape by a predetermined amount when recording or reproducing, and the magnetic head device 1 has insertion holes 7a, 7a formed at both left and right ends of the base portion 7 of the head holder 6. Threaded screws 11, 11
It is fixed to the head base 10 by.

(B. Tape guide) 12 and 12 are tape guides.

(B-1. Structure) These tape guides 12 and 12 are formed integrally with the head holder 6. That is, the front end portions 12, 12 of the side walls 9, 9 of the holding portion 8 are bent inward toward each other, and the upper end portions 12a, 12a (hereinafter, referred to as "upper protrusion portions") and the lower end portions thereof are mutually separated. The approximately half portions 12b, 12b (hereinafter, referred to as "lower protrusions") that are biased toward the far side end are protruded forward from the other portion, and such a front end portion is formed.
12 and 12 are tape guides.

The portions 13, 13 between the upper protrusions 12a, 12a and the lower protrusions 12b, 12b of the tape guides 12, 12 are tape contact surfaces, that is, most of the magnetic tape 14 in the width direction is in the thickness direction. The tape contact surfaces 13 and 13 are formed so as to have a gentle convex curved surface when viewed in a horizontal cross section, and the height thereof is greater than the width of the magnetic tape 14. It is made slightly smaller, is slightly rearward of the front end of the tape contact surface 3a of the magnetic head 2 when viewed from the side, and its intermediate position in the height direction is at both ends of the head cores 4, 4 ,. It is formed to be at a height corresponding to an intermediate position between the two.

Further, the bottom surface of the upper protrusion 12a, 12a, that is, the surface 15 positioned so as to protrude from the upper end of the tape contact surface 13, 13.
15 is a tape path reference surface, that is, a surface that regulates the position in the width direction by contacting one side edge of the magnetic tape 14, and the tape path reference surfaces 15 and 15 are entirely flat. And is formed to be perpendicular to the tape contact surfaces 13, 13.

Further, the upper surfaces 16 and 16 of the lower protrusions 12a and 12a are biased slopes,
That is, it is a surface for urging the moving force to the tape path reference surface 15, 15 side to the magnetic tape 14 contacting the tape contact surface 13, 13, and the urging inclined surfaces 16, 16 are tape contact surfaces. Face 1
Extends from the lower end of 3, 13 toward the front diagonally lower side, and
The vertical cross section viewed from the front is formed to have a convex curved surface.

Incidentally, the tape contact surfaces 13, 13 and the tape path reference surfaces 15, 15 in the left-right direction, that is, the widths in the tape running direction are the same width W ₁ , and these tape contact surfaces 13,
13 and the width W ₁ of the tape path reference surfaces 15 and 15 are biasing slopes 16 and 16.
Is approximately twice the width W ₂ in the tape running direction.

(B-2. Operation) Then, when the magnetic head device 1 advances with respect to the magnetic tape 14, the magnetic tape 14 relatively moves from its thickness direction to the tape contact surface 3a of the magnetic head 2 and also to the tape contact surface 3a.
At positions on both sides of 3a, the tape guides 12 and 12 are in contact with the tape contact surfaces 13 and 13 of the tape guides 12 and 12, respectively, and the biasing slopes 16 and 16 of the tape guides 12 and 12 have lower edges of the magnetic tape 14.
14a is contacted.

Then, when the magnetic tape 14 is run from this state,
Due to the tension, the magnetic tape 14 causes the tape contact surface 3a of the magnetic head 2 and the tape contact surface 1 of the tape guides 12, 12.
3, 13 and the biasing slopes 16 and 16, and a lower rear edge 14a pressed against the biasing slopes 16 and 16 has a rearward diagonal upward movement force, and therefore the magnetic tape 14 Upward movement force is applied to the magnetic tape, and this movement force causes magnetic tape
The upper edge 14b of 14 will be pressed against the tape path reference planes 15,15.

Thus, the magnetic tape 14 is always run with its upper edge 14b in contact with the tape path reference surfaces 15 and 15, whereby the position of the magnetic tape 14 in the width direction, in other words, the height of the magnetic head 2 is increased. The position in the direction is stably held, and the tape width direction and the track width direction of the head gaps 4a, 4a, ... Accurately match, that is, the magnetic tape 14 and the head gaps 4a, 4a ,. Azimuth adjustment between and will be made.

Then, as described above, the width W ₁ of the tape path reference surfaces 15, 15 of the tape guides 12, 12 is approximately twice the width W ₂ of the biasing slopes 16, 16, so that the biasing slope 16, The upper edge 14 of the magnetic tape 14 is moved by the moving force applied to the magnetic tape 14 by the magnetic tape 16.
The force to bring b into contact with the tape path reference surfaces 15, 15 is the upper edge 14b.
Of the tape path reference surface 15 of the
Therefore, even with a magnetic tape having low rigidity such as a thin magnetic tape, it is possible to prevent the side edge portions pressed against the tape path reference surfaces 15 and 15 from curling or breaking. Further, since the width of the tape contact surfaces 13 and 13 is the same as the width of the tape path reference surfaces 15 and 15, one side edge 14b of the magnetic tape 14 is pressed against the tape path reference surfaces 15 and 15. The entire contacted portion is in contact with the tape contact surfaces 13 and 13, whereby the position of this portion in the thickness direction is stabilized and the apparent rigidity is increased.

Therefore, the magnetic tape 14 used is thin, or the tape path is basically a tape guide.
Even when the tapes 12 and 12 are slightly displaced upward from the tape contact portions, it is possible to prevent the side edges pressed against the tape path reference surfaces 15 and 15 from curling or breaking.

.. are tape guide pins provided in a cassette case (not shown) of the tape cassette, and 18 is a pad.

(F-2. Second Embodiment) [FIG. 6] FIG. 6 shows a second embodiment 1A of the tape guide of the present invention.

The magnetic head device 1A shown in the second embodiment differs from the magnetic head device 1 shown in the first embodiment in that the tape contact surface of the tape guide and the tape path reference surface are biased against the biasing slope. And extended to the anti-magnetic head side. Therefore, the description of the parts other than the above differences will be omitted by giving the same reference numerals to the similar portions in the magnetic head device 1. The usage of such a code and its meaning are the same in the third embodiment described later.

In this magnetic head device 1A, the tape guides 12A, 1
2A is formed such that its distant half parts are located at positions projecting from the side walls 9, 9 toward the anti-magnetic head 2 side,
The biasing slopes 16 and 16 are provided so as to extend from the positions biased toward the side ends of the tape contact surfaces 13 and 13 which are closer to each other. Therefore, also in the tape guides 12A and 12A, the width W ₁ of the tape contact surfaces 13 and 13 and the tape path reference surfaces 15 and 15 in the tape running direction is made larger than the width W ₂ of the biasing slopes 16 and 16.

(F-3. Third Embodiment) [FIG. 7] FIG. 7 shows a third embodiment of the tape guide of the present invention.

The magnetic head device 1B shown in the third embodiment is the first
The only difference from the magnetic head device 1 shown in the embodiment is that the tape contact surface and the tape path reference surface of the tape guide are extended to the left and right sides with respect to the biasing slope.

That is, in this magnetic head device 1B, the tape guide
The left and right sides of 12B and 12B are formed so as to project laterally with respect to the side walls 9 and 9, respectively.
16 is arranged so as to extend from a substantially central portion in the width direction of the tape contact surfaces 13, 13.

Therefore, also in the tape guides 12B and 12B, the width W ₁ of the tape contact surfaces 13 and 13 and the tape path reference surfaces 15 and 15 in the tape running direction is larger than the width W ₂ of the biasing slopes 16 and 16. .

(G. Effect of the Invention) As is apparent from the above description, the tape guide of the present invention is arranged on at least one side of the magnetic head in the tape running direction, and projects forward from both ends of the magnetic head. The tape contact surface is formed such that the tape comes into contact with the tape in the thickness direction and the width in the direction orthogonal to the tape running direction is narrower than the width of the tape, and the tape contact surface is formed from one of upper and lower ends of the tape contact surface. A tape guide having a tape path reference portion that projects substantially perpendicular to the tape contact surface and a biasing inclined portion that projects obliquely forward from the other end of the tape contact surface, the tape contact surface and the tape contact surface The width of the tape path reference portion in the tape running direction is made wider than the width of the biasing inclined portion in the tape running direction.

Therefore, according to the tape guide of the present invention, the total force of pressing the tape against the tape path reference portion is the same as the total movement force of the biasing inclined portion, but one side edge of the tape is pressed. Since the width of the tape path reference portion is larger than the width of the biasing inclined portion, the pressing force with which one side edge of the tape is pressed against the tape path reference portion is applied to the portion of the one side edge that is in contact with the tape path reference portion. Since the pressing force per unit area (length) of one side edge of the tape is dispersed and the width of the tape contact surface is larger than the width of the biasing inclined part, the tape path reference part of the tape is The position in the thickness direction of the portion corresponding to the one side edge to be abutted is stabilized and the apparent rigidity is increased, whereby a sufficient moving force to the tape path reference portion side is applied to the tape. Tape tape Side edges is brought into contact with the reference portion can be prevented from being broken or curled by the moving force.

In the above embodiment, the width of the tape contact surface and the width of the tape path reference portion are both the same and approximately twice the width of the biasing inclined portion. However, these widths are related to each other in the tape guide. It may be appropriately determined according to the inclination degree, width, etc. of the bias inclined portion, and the width of the tape contact surface and the width of the tape path reference portion do not necessarily have to be the same.

Further, in the above embodiment, a part of the head holder holding the magnetic head is used as the tape guide,
The tape guide according to the present invention is not limited to this type, and may be formed as an independent component and provided so as to be integrated with the magnetic head.

[Brief description of drawings]

1 to 5 show a first embodiment in which the tape guide of the present invention is applied to a tape guide in a magnetic head device integrated with a tape guide, and FIG. 1 shows a state in which a magnetic tape is in contact. A front view of the entire magnetic head device, FIG. 2 is a perspective view of the entire magnetic head device, FIG. 3 is an exploded perspective view of the magnetic head device, and FIG. 4 is a sectional view taken along the line IV-IV of FIG. FIG. 5 is a plan view showing a magnetic head device and a tape guide in a cassette in a state in which a magnetic tape is in contact with the tape guide, and FIG. 6 is a tape in the magnetic head device of the tape guide integrated type of the present invention. A second embodiment applied to a guide is shown, (A) is a front view, (B) is a plan view, and FIG. 7 is a tape guide of the present invention applied to a tape guide in a magnetic head device integrated with a tape guide. Third An example is shown, (A) is a front view,
8B is a plan view, FIG. 8 shows an example of a conventional tape guide, FIG. 8A is a perspective view showing the entire magnetic head device, and FIG. 8B is a magnetic head device with a magnetic tape in contact. FIG. Explanation of code 2 …… Magnetic head, 12 …… Tape guide, 13 …… Tape contact surface, 14 …… Tape, 15 …… Tape path reference part, 16…
… Biasing ramp, w1 …… width of tape contact surface and tape path reference part, w2 …… width of biasing ramp, 12A …… tape guide, 12B …… tape guide

Claims (1)

(57) [Scope of utility model registration request] 1. A magnetic head, which is disposed on at least one side portion in the tape running direction, projects forward from both ends of the magnetic head, and has a width in a direction perpendicular to the tape running direction in which the tape contacts from its thickness direction. A tape contact surface formed to be narrower than the width of the tape, a tape path reference portion protruding substantially perpendicularly to the tape contact surface from one of the upper and lower ends of the tape contact surface, and the tape contact A tape guide having an urging inclined portion projecting obliquely forward from the other end of the surface, the width of the tape contact surface and the tape path reference portion in the tape traveling direction being the tape traveling of the urging inclined portion. A tape guide characterized by being wider than the width in the direction.