JPH0419623Y2 - - Google Patents

Description

[Detailed Description of the Invention] The tape recorder of the present invention will be explained according to the following items.

A. Field of industrial application B. Overview of the invention C. Prior art [Figures 5 and 6] D. Problems that the invention aims to solve [Figures 5 and 6] E. Means for solving the problems F Example a Tape cassette [Fig. 1, Fig. 2, Fig. 4]
b) Tape recorder [Figs. 1 to 3] b-1 Outer casing, cassette mounting part [Figs. 1 to 3] b-2 Cassette positioning pin [Figs. 1 to 3] b-3 Motor [Figs. 1 to 3] b-4 Capstan [Figs. 1 to 3] b-5 Other parts [Figs. 2 and 3] c Attaching the tape cassette to the tape recorder [Fig. 1 Figure, Fig. 2] d Operation G Effect of the invention (A Field of industrial application) The present invention relates to a new tape recorder. Specifically, a cassette positioning pin is provided in a cassette mounting part to which a tape cassette is detachably mounted, which is inserted relatively into a positioning hole formed in the tape cassette when the tape cassette is mounted. This invention relates to a tape recorder that uses the positioning pin of the cassette as a bearing member for the rotating shaft of a motor for rotating rotating members such as a capstan and reel stand, thereby shortening the bearing span of the rotating shaft of the motor. The purpose of the present invention is to provide a new tape recorder that allows the size of the tape recorder to be miniaturized without having to reduce the size of the tape recorder.

(B Overview of the invention) The tape recorder of the invention has a tape cassette that is removably installed in the cassette installation part, and when the tape cassette is installed, the positioning hole formed in the tape cassette is positioned relative to the positioning hole formed in the tape cassette. In a tape recorder equipped with a cassette positioning pin that is inserted into the cassette positioning pin, a part of the rotating shaft of the motor for rotating the capstan or reel stand is supported by the cassette positioning pin, so that the bearing of the motor's rotating shaft is This allows the tape recorder to be made smaller without shortening the span.

(C Prior Art) [Figures 5 and 6] Generally, a tape recorder is necessarily provided with rotating members such as a capstan and a reel stand. A plurality of motors are provided, and gears, a transmission belt, or the like are provided for transmitting the rotational force of the motors to the rotating member.

FIGS. 5 and 6 show an example of a conventional audio tape recorder in which the rotational force of a motor is transmitted to a capstan via a transmission belt.

b is an outer casing of the tape recorder a, and a portion of the inner space of the outer casing b that is closer to the left end surface is a battery storage section d for storing batteries c and c; A speaker e is placed using a space near the top of the speaker d.

f is a cassette mounting part for mounting a tape cassette g, which occupies approximately half the space near the right end surface in the outer casing b, and includes reel stands h, i, a capstan j, a cassette positioning pin (not shown), etc. is provided so as to protrude upward.

Reference numeral k denotes a motor disposed between the battery storage section d and the cassette mounting section f, and a cylinder type motor is used as the motor k. 1 is a rotating shaft of motor k, and the rotating shaft 1 is rotatably supported at positions near the upper and lower ends of two bearing members (not shown) provided at both upper and lower ends of the housing m of the motor k. At the same time, a drive pulley n is fixed to a lower end portion projecting downward from the housing m.

A flywheel o is rotatably supported by a bearing member (not shown) below the cassette mounting part f, and a groove for winding a belt is formed on the outer peripheral surface of the flywheel o. The capstan j is erected from the center of the flywheel o.

An endless transmission belt p is stretched between the drive pulley n and the flywheel o.

When the motor k rotates, its rotational force is transmitted to the flywheel o via the transmission belt p, so that the flywheel o and the capstan j are rotated together, and the tape cassette g The magnetic tape q is run by being sandwiched between a rotating capstan j and a pinch roller (not shown) that is pressed against the rotating capstan j.

(D. Problem that the invention attempts to solve) [Figure 5,
[Fig. 6] By the way, when attempting to downsize the tape recorder a having the above-described structure, it is conceivable to first arrange the motor k below the cassette mounting part f to reduce its planar shape. .

However, if the motor k is disposed below the cassette mounting part f, although the planar shape of the outer casing b can be made smaller, another problem arises in that the thickness of the outer casing b increases.

Therefore, if a thin motor such as a so-called plane facing type motor is used, for example,
Even if the motor is disposed below the cassette mounting part f, the thickness of the outer casing b can be prevented from increasing to a large extent.

However, if a plane-opposed motor is used and its rotating shaft is supported at or near both ends of the motor in the thickness direction, it becomes impossible to increase the so-called bearing span of the motor's rotating shaft. Therefore, sufficient rigidity of the rotating shaft, particularly in the radial direction, cannot be obtained.

Moreover, when a transmission belt is used as a rotational force transmission member, tension in the radial direction by the transmission belt p is applied to the portion of the rotation shaft protruding from one bearing part, so that the rotation shaft is not rotated. The vibration in the radial direction increases and the rotation becomes extremely unstable, resulting in unstable running of the magnetic tape q, resulting in large vibration noises, a decrease in playback output, etc., and performance problems. The various problems mentioned above arise.

(E. Means for Solving Problems) In order to solve the above-mentioned problems, the tape recorder of the present invention has a motor disposed below the cassette mounting part, and a part of the rotating shaft of the motor is fixed to the cassette position. It is rotatably supported on a pin.

Therefore, according to the present invention, since the motor is disposed below the cassette mounting section, at least the planar shape of the tape recorder can be made smaller, and a part of the rotating shaft of the motor can be projected toward the cassette mounting section. Since the protruding portion can be supported by the cassette positioning pin, a sufficient length of the bearing span of the rotating shaft of the motor can be ensured.

(F. Embodiment) The details of the tape recorder of the present invention will be explained below according to the embodiment shown in the attached drawings.

The embodiment shown in the drawings is an application of the present invention to an audio tape recorder using an ultra-small tape cassette called a so-called microcassette.

(a Tape cassette) [Figures 1, 2, 4
[FIG.] First, an example of a tape cassette used in a tape recorder, which will be described later, will be described.

1 is a tape cassette. Reference numeral 2 denotes a cassette case of the tape cassette 1, and its front side (the downward direction in FIG. 2 is the front side, and the upward direction is the rear side; the leftward direction in the figure is the left side; (The direction to the right is defined as the right side. In the following explanation, directions will be referred to in this direction.) Most of the tape except for the left and right ends are open, and there are approximately slit-shaped tapes on both the left and right ends. An exit is formed.

Reference numerals 3 and 3' designate tape guides located near the tape outlet.

4 and 5 are tape reels rotatably housed inside the cassette case 2. Of these two tape reels 4 and 5, the one located on the right side is the tape reel on the supply side (hereinafter referred to as the "S reel").
Say. ), and the tape reel 5 on the left side is the take-up side tape reel (hereinafter referred to as the "T reel").
It is.

6 is a magnetic tape. Both ends of the magnetic tape 6 are fixed to the S reel 4 and the T reel 5, respectively, and are wound by a predetermined amount and passed through the following passes. That is, the magnetic tape 6 is pulled out from the S reel 4, wound around one tape guide 3, guided out of the cassette case 2 from one tape outlet, passed through the front of the cassette case 2, and then passed through the other tape outlet. from the other tape guide 3' into the cassette case 2.
After being wound on the T-reel 5, a path is passed through.

7 is an insertion hole formed approximately at the center in the left-right direction of the front side of the cassette case 2;
The insertion hole 7 is formed into a substantially oval shape that is long in the front-rear direction. This insertion hole 7 is a hole into which a capstan provided in a tape recorder, which will be described later, is inserted.

Reference numerals 8 and 8' indicate positioning holes formed near both left and right ends of the front side of the cassette case 2, and these positioning holes 8 and 8' are used to attach the tape cassette 1 to a tape recorder to be described later. This is a hole into which a positioning pin provided on the tape recorder side is inserted, thereby positioning the tape cassette 1 with respect to the tape recorder, and is formed into a long rectangle in the front-rear direction.

Note that the insertion hole 7 and positioning holes 8, 8' described above
is formed so as to vertically penetrate inside the portion of the magnetic tape 6 that passes through the front surface of the cassette case 2.

(b Tape recorder) [Figures 1 to 3] 9 is a tape recorder.

(b-Outer casing, cassette attachment part) [Figs. 1 to 3] Reference numeral 10 denotes the outer casing of the tape recorder 9, and the outer casing 10 has a ceiling on the rear edge and the right edge of the top plate 10a. An opening 11 (see FIG. 3) having a size of approximately two-thirds of the plate 10a is formed,
An opening/closing lid 12 is provided in the opening 11.

Reference numeral 13 denotes a chassis disposed in the internal space of the outer casing 10 between a position slightly to the left of the center in the left-right direction and a position near the right end surface. It is located at approximately the middle height in the horizontal direction.

The opening 1 formed in the top plate 10a
The space between the tape cassette 1 and the chassis 13 serves as a cassette mounting portion 14 for mounting the tape cassette 1 thereon.

15 and 16 (see FIG. 2) are reel stands (only the upper part thereof is schematically shown in the drawing), and reel engaging shafts 15a, located at the upper part thereof,
16a is positioned so as to protrude upward from the chassis 13. Incidentally, of the two reel stands 15 and 16, the one located on the right side is the reel stand on the supply side to which the S reel 4 of the tape cassette 1 described above is engaged, and the reel stand 1 located on the left side
Reference numeral 6 denotes a reel stand on the take-up side with which the T-reel 5 is engaged.

(b-2 Cassette Positioning Pins) [Figs. 1 to 3] Reference numerals 17 and 18 are cassette positioning pins provided in the cassette mounting section 14. These cassette positioning pins 17 and 18 are positioned so as to protrude upward from positions near both left and right ends of the portion of the chassis 14 corresponding to the front end of the opening 11, and their lower ends are attached to the chassis 13. At the same time, the outer peripheral surface of the tape cassette 1 near the chassis 13 is connected to the cassette case 2 of the tape cassette 1.
It is formed in a cylindrical shape having a diameter that is the same as the width of the positioning holes 8, 8' formed in the
The portion above the cylindrical portion is formed into a conical surface whose diameter gradually decreases toward the upper end.

Then, these two cassette positioning pins 1
Of 7 and 18, the one 18 located on the left side also serves as a bearing for a rotating shaft of a motor, which will be described later.

That is, the left cassette positioning pin 18 is formed with a hole 19 passing through its shaft center in the axial direction, and bearing members 20, 20' are press-fitted into the approximately middle and lower end portions of the hole 19 in the axial direction. It is set up in a shape.

(b-3 Motor) [Figures 1 to 3] Reference numeral 21 is a so-called plane facing type motor.

Reference numeral 22 denotes a stator board formed in a substantially disk shape, and the stator board 22 is fixed to the lower surface of the chassis 13 with its substantially center portion located at a position substantially corresponding to the left cassette positioning pin 18. There are multiple stator coils 2 on the bottom surface.
3, 23, . . . are attached in an annular arrangement.

24 is a rotor whose main part 24a is formed into a substantially circular dish shape, and a pulley part 25 is integrally formed on the lower surface of the main part 24a, and a press-fit hole 25a is formed in the pulley part 25. There is. and,
A substantially ring-shaped rotor magnet 26 is attached to the main portion 24a.

Reference numeral 27 denotes a rotating shaft, and the rotating shaft 27 has a substantially middle portion in the axial direction and a portion near the upper end thereof, which are provided on the left cassette positioning pin 18.
It is rotatably supported by two bearing parts 20 and 20', and its lower end is press-fitted into a press-fit hole 25a formed in the rotor 24.

Thus, the rotor 24 is positioned such that its rotor magnet 26 faces the stator coils 23, 23, . . . with a slight distance from them.

Note that the rotating shaft 27 is prevented from moving in the axial direction by a thrust receiving means (not shown).

Therefore, when a drive current switched at a predetermined frequency is supplied to the stator coils 23, 23, . . . , the rotor magnet 26 rotates due to the magnetic attraction force generated between it and the stator coils 23, 23, . The rotor 24 and rotating shaft 27
is rotated in a predetermined direction.

(b-4 Capstan) [Figures 1 to 3] 28 is a capstan. The capstan 2
8 has a chassis 13 approximately in the middle in its axial direction.
Among them, the two cassette positioning pins 17 and 1
It is inserted through a hole 29 (see FIG. 1) formed approximately in the center between the chassis 13 and the chassis 13, and its upper portion is positioned so as to protrude upward from the chassis 13. And, capstan 28 is chassis 13
A portion located below is rotatably supported by a bearing member (not shown) fixed to the chassis 13, and a flywheel 30 is fixed to the lower end thereof. 30a is a pulley groove formed on the outer peripheral surface of the flywheel 30.

The pulley groove 30a formed in the flywheel 30 and the pulley portion 2 of the rotor 24
An endless transmission belt 31 is stretched between the transmission belt 5 and the transmission belt 5.

When the motor 21 is rotated, the rotational force is transferred to the flywheel 3 via the transmission belt 31.
0, thereby causing the capstan 28 to rotate.

(b-5 Other components) [Figures 2 and 3] Reference numerals 32 and 32 are batteries stored in a battery storage section provided in a portion between the chassis 13 and the left end surface inside the outer casing 10. be.

Reference numeral 33 denotes a speaker, and the speaker 33 is attached from the inside to a portion of the top plate 20a of the outer casing 10 that corresponds to the battery storage section.

(c. Attaching the tape cassette to the tape recorder) [FIGS. 1 and 2] The tape cassette 1 is attached to the cassette attaching portion 14 of the tape recorder 9 in the following manner.

That is, a cassette holding member (not shown) for holding the tape cassette is provided on the inner surface of the opening/closing lid 12, and after the tape cassette 1 is inserted into the cassette holding member in a predetermined orientation, the opening/closing lid 12
By moving the cassette to the position where the opening 11 is closed, the cassette is mounted in the cassette mounting section in the state shown in FIGS. 1 and 2.

Then, the tape cassette 1 is inserted into the cassette mounting section 1.
4, the cassette positioning pin 17,
18 are inserted relatively into the positioning holes 8, 8' formed in the cassette case 2, thereby
The tape cassette 1 is positioned with respect to the cassette mounting portion 14.

Further, the tape cassette 1 is attached to the cassette mounting section 14.
When the tape cassette 1 is mounted on the tape cassette 1, the reel engagement shafts 15a and 16a of the reel stands 15 and 16 are inserted into the engagement holes (not shown) formed in the tape reels 4 and 5 of the tape cassette 1, so that the S The reel 4 is rotated integrally with the reel stand 15 on the supply side, and the T reel 5 is rotated integrally with the reel stand 16 on the winding side. Further, the capstan 28 is relatively inserted into the insertion hole 7 formed in the cassette case 2, so that the capstan 28 is positioned inside the portion of the magnetic tape 6 that is passed through the front surface of the cassette case 2. It turns out.

(d operation) Then, the tape cassette 1
4, when a command to perform recording or reproduction is given, the motor 21 is rotated, thereby rotating the capstan 28 in the clockwise direction in FIG. The table 16 is rotated and the T-reel 5 is rotated in the tape winding direction. At approximately the same time, a pinch roller (not shown) is pressed against the capstan 28 from the front side with the magnetic tape 6 in between, and a magnetic head (not shown) for recording and reproducing is moved to a position where it comes into contact with the magnetic tape.

Thus, the magnetic tape 6 is run in the forward direction, that is, in the running direction in which it is pulled out from the S reel 4 and wound onto the T reel 5, and signals are recorded or read by the magnetic head. Become.

(G. Effects of the invention) As is clear from the above description, the tape recorder of the invention is capable of attaching a tape cassette to the cassette mounting part to which the tape cassette is detachably mounted. In a tape recorder equipped with a cassette positioning pin that is inserted relatively into a positioning hole formed in the tape recorder, a motor is disposed below the cassette mounting part, and a part of the rotating shaft of the motor is connected to the cassette positioning pin. It is characterized by being rotatably supported.

Therefore, according to the present invention, since the motor is disposed below the cassette mounting section, at least the planar shape of the tape recorder can be made smaller.

In addition, since a part of the motor's rotating shaft can be positioned so as to protrude toward the cassette mounting part, and the protruding part can be supported by the cassette positioning pin, the bearing span of the motor's rotating shaft can be sufficiently extended. Therefore, even if a thin motor such as a flat-faced type motor is used, sufficient rigidity in the radial direction of the rotating shaft can be obtained.

[Brief explanation of drawings]

Figures 1 to 4 show an example of the implementation of the tape recorder of the present invention, with Figure 1 being an enlarged vertical sectional view of the main parts, and Figure 2 being a front view with a portion of the outer casing cut away. 3 is a front view with a part of the outer casing cut away, and FIG. 4 is an enlarged plan view of the tape cassette. FIGS. 5 and 6 show an example of a conventional tape recorder. The figure is a plan view with a part of the outer casing cut away, and FIG. 6 is a front view with a part of the outer casing cut away. Explanation of symbols, 1... Tape cassette, 8, 8'
... hole, 9 ... tape recorder, 14 ... cassette mounting section, 17, 18 ... cassette positioning pin, 21 ... motor, 27 ... rotating shaft.

Claims (1)

[Claims for Utility Model Registration] When the tape cassette is attached to a cassette attachment part where the tape cassette is detachably attached, the tape cassette is inserted relatively into a positioning hole formed in the tape cassette. 1. A tape recorder equipped with a cassette positioning pin, characterized in that a motor is disposed below a cassette mounting part, and a part of the rotating shaft of the motor is rotatably supported on the cassette positioning pin.