JPH0416258Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a tape end detection device for a magnetic tape used in a tape recorder for recording and reproducing digital signals, such as PCM signals.

BACKGROUND ART AND PROBLEMS Currently, tape recorders have been proposed that convert analog signals such as acoustic signals into digital signals, such as PCM signals, and record and reproduce the converted signals. As a tape cassette used in this tape recorder, a tape cassette 1 with an opening/closing lid as illustrated in FIGS. 1 to 4 is used.

This tape cassette 1 is formed by combining an upper half 2 and a lower half 3, and an opening/closing lid 5 is attached to a front opening 4 of the tape cassette 1. In FIGS. 1 to 4, 6 is a reel shaft insertion hole, 7 is a window, 8 is a circular through-hole for an optical sensor pin insertion hole, and 9 is a reel shaft insertion hole.
is a reference hole drilled as a rectangular through hole,
10 is a light guide hole, 11 is a capstan insertion hole, 12 is a magnetic tape, and 13 is a hub. The opening/closing lid 5 of the tape cassette 1 is U-shaped and has shaft pins 14 protruding from the inner surfaces of both lateral sides.
The free end of this shaft pin 14 is biased toward the rear of the tape cassette 1 by a leaf spring 16, and the tape cassette 1 is opened and closed. Free ends 17 of both lateral sides of the lid 5
is attached to the tape cassette 1 in such a manner that it faces into the reference hole 9.

This opening/closing lid 5 covers the front opening 4 when the tape cassette 1 is not in use to prevent hands from touching the magnetic tape 12 and preventing dust from entering inside, and can be rotated and opened when in use. It is something.

To use this tape cassette 1 by attaching it to a tape recorder, insert this tape cassette 1 into the first
Insert with the opening/closing lid 5 closed as shown in the figure. Then, a square columnar reference pin 18 is inserted into the reference hole 9 of the tape cassette 1 and comes into contact with the rear positioning surface 9a of the reference hole 9 to position and hold the tape cassette 1 at a predetermined position.

At the same time, the reference pin 18 pushes each free end 17 of the open/close lid 5 facing into the reference hole 9, and pushes the open/close lid 5 forward of the front opening 4. In this state, use the riser pin 19 to move the opening/closing lid 5 to arrow A.
Rotate in the direction to open it. Since the opening/closing lid 5 is pushed forward, it can be inserted around the corner of the front opening 4 of the tape cassette 1. Note that a capstan (not shown) is inserted into the capstan insertion hole 11.

Furthermore, an optical sensor pin 20 having a cylindrical light-receiving element is inserted into the optical sensor pin insertion hole 8 of the tape cassette 1, and correspondingly extends outward from the optical guide hole 10 on the side of the tape cassette 1. A light emitting element pin 21 is arranged. As shown in FIG. 3, the magnetic tape 12 is arranged so that the light emitted from the light emitting element of the light emitting element pin 21 passes through the light guide hole 10 and crosses the optical path B leading to the light receiving element of the optical sensor pin 20.
A running path B was set, and the light receiving element was configured to detect the light transmitted when the transparent leader tapes at the beginning and end of the magnetic tape 12 crossed this optical path B.

For this reason, three pins, the optical sensor pin 20, the light emitting element pin 21, and the reference pin 18, must be accurately positioned and erected within a narrow range in the cassette mounting portion of the tape recorder. however,
It is extremely difficult to accurately erect the three things, the optical sensor pin 20, the light emitting element pin 21, and the reference pin 18, in such a narrow area. The disadvantages were that it was difficult to use and productivity was low.

Purpose of the Invention In view of the above, the object of the present invention is to reduce the number of pins in the cassette mounting portion of a tape recorder and to improve productivity.

Summary of the invention The tape end detection device for a tape recorder of the invention consists of a reference pin that is inserted into a reference hole of a tape cassette to position the tape cassette and advance the opening/closing lid of the tape cassette, and a light sensor pin of the tape cassette. Since the optical sensor pin to be inserted into the insertion hole is provided integrally with the reference pin and the optical sensor pin, and either the light emitting element or the light receiving element is provided facing each other, the tape recorder The number of pins erected within the cassette mounting portion of the tape recorder can be reduced and the productivity of the tape recorder can be improved.

Embodiment Hereinafter, an embodiment of the tape end detection device for a tape recorder according to the present invention will be described with reference to FIGS. 5 to 8.

Note that in FIGS. 5 to 8, parts corresponding to those in FIGS. 1 to 4 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

FIG. 5 is a side view showing the tape cassette 1 mounted on the cassette mounting section 26 of a tape recorder equipped with the tape end detection device 25 of this embodiment.
This tape cassette 1 has a tape end detection device 2 installed at a position corresponding to both horizontal corners of the front opening of the tape cassette 1 on the cassette mounting section 26.
5 and a support base 27.

The tape end detection device 25 according to this embodiment is constructed entirely as a unit made of a metal material such as aluminum. As shown in FIGS. 7 and 8, this unitized tape end detection device includes a cylindrical optical sensor pin 20 and a quadrangular prismatic reference pin at predetermined positions on the upper surface of the rectangular base 28. 29 are provided. This optical sensor pin 20
Each of the reference pins 29 and 29 has a conical free end, and a flange-like abutment 30 is formed at the root end thereof. This support base 30 is used to position the tape cassette 1 in the height direction by coming into contact with the bottom surface of the tape cassette 1 through which the optical sensor pin 20 and the reference pin 29 are inserted.

Further, a light receiving element is mounted inside the optical sensor pin 20, and a reference pin 29 facing the light receiving element is mounted inside the optical sensor pin 20.
The light incident from the window hole 31 corresponding to the window hole 31 is sensed. Further, a light emitting element (such as a light emitting diode) is mounted inside the reference pin 29, and a window hole 32 provided corresponding to the optical sensor pin 20 is provided.
The window hole 32 of the reference pin 29 and the window hole 3 of the optical sensor pin 20 are
1, an optical path B is formed between the two. Further, one surface of the reference pin 29 is accurately positioned and formed as a horizontal positioning surface 29a of the tape cassette 1.

In addition, through holes 33, 33 for screwing the tape end detection device 25 to the cassette mounting portion are bored in both diagonal corners of the rectangular base 28.
Furthermore, terminals 41 of the light receiving element of the optical sensor pin 20 and the light emitting element of the reference pin 29 are provided on one side of the rectangular base 28 .

Further, a positioning convex portion 34 is provided protruding from the bottom surface of the rectangular base 28, and a positioning concave portion 35 is provided in the cassette mounting portion 26 to fit thereto. Then, the tape end detection device 25 is inserted into the cassette mounting section 26.
When installing the cassette in the specified position above, the cassette installation part 26
By fitting the positioning protrusion 34 into the recess 35, the positioning can be easily performed and the screw 36 can be screwed.

Tape end detection device 2 configured in this way
5 optical sensor pin 20 and reference pin 2
The portions of the optical sensor pin insertion hole 8 and the reference hole 9 of the tape cassette 1 into which the optical sensor 9 is inserted are as shown in FIG.

That is, in the optical sensor pin insertion hole 8,
A notch 37 is provided in a portion of the optical sensor pin corresponding to the window hole 31 and is open, and a notch 38 is also provided in a portion of the reference hole 9 that corresponds to the window hole 32 of the reference pin 29 and is open. Make sure that these do not block the optical path B. At the same time, a guide roller 39 and a guide pin 40 provided in the tape cassette 1 allow the magnetic tape 12 to pass through the optical path B between the optical sensor pin 20 and the reference pin 29 so as to block it. Set the tape path to be used.

With this configuration, while the running magnetic tape 12 crosses the optical path B, the light from the reference pin 29 is blocked and does not reach the light receiving element of the optical sensor pin 20; When a transparent leader tape at the start or end of the tape 12 crosses the optical path B, the light passes through this leader tape and reaches the light receiving element. By detecting this, the magnetic tape 12 is located at the start or end. We know that we have reached the end.

By detecting the end of the tape, the tape recorder can be caused to perform various related operations such as automatically stopping the running of the magnetic tape 12.

Furthermore, with this configuration, the reference pins, the optical sensor pins, and the light emitting element pins, which were conventionally provided in the cassette mounting part 26 of the tape recorder, can be replaced with the optical sensor pins 20 and the reference pins 29. It is suitable for mass production because it can be combined into two pieces, and mounting them can be done by simply screwing the single unitized tape end detection device 25 to the cassette mounting part 26. This can improve productivity. Another advantage is that it is not necessary to provide the light guide hole 10 in the tape cassette 1.

Further, a positioning surface 9a is provided in a part of the reference hole 9 of the tape cassette 1 into which the reference pin 29 is inserted, and the positioning surface 9a is brought into contact with the positioning surface 29a of the reference pin 29 so that the tape cassette 1 The cassette mounting part 26
position and hold it in a predetermined position inside.

Furthermore, this tape cassette 1 has the same structure as shown in FIG. 4 of the conventional tape cassette 1 described above.
Since the structure is such that the free end 17 of the opening/closing lid 5 faces into the reference hole 9, when the reference pin 29 is inserted into the reference hole 9, the free end 17 is pushed and the opening/closing lid 5 is opened. It also serves to push the front opening 4 forward. In addition, in the above-mentioned embodiment, the light receiving element was attached to the optical sensor pin 20 and the light receiving element was attached to the reference pin 29, but conversely, a light emitting element was attached to the optical sensor pin 20, reference pin 2
Of course, the structure may be such that a light-receiving element is attached to the light-receiving element 9.

It goes without saying that the present invention is not limited to the above-described embodiments, and that various other configurations may be adopted without departing from the gist of the present invention.

Effects of the invention According to the tape end detection device for a tape recorder of the present invention, the number of pins erected in the cassette mounting part of a tape recorder can be reduced, and productivity can be improved. be.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a tape cassette installed in a cassette mounting part equipped with a tape end detection device of a conventional tape recorder, and Fig. 2 shows the tape cassette shown in Fig. 1 in use with the lid opened. 3 is a plan view showing the upper half of the tape cassette shown in FIG. 1 removed, and FIG. 4 is a side view illustrating the state in which the opening/closing lid of the tape cassette shown in FIG. 1 is opened. FIG. 5 is a side view showing an embodiment of the tape end detection device for a tape recorder of the present invention, FIG. 6 is an enlarged plan view of the main part of FIG. 5,
FIG. 7 is a plan view showing the tape end detecting device shown in FIG. 5 taken out, and FIG. 8 is a front view showing the tape end detecting device shown in FIG. 5 taken out. 1 is a tape cassette, 8 is an optical sensor pin insertion hole, 9 is a reference hole, 12 is a magnetic tape, 2
0 is an optical sensor pin, 25 is a tape end detection device, and 29 is a reference pin.

Claims (1)

[Scope of utility model registration request] A reference pin inserted into a reference hole of a tape cassette to position the tape cassette and advance an opening/closing lid of the tape cassette and an optical sensor pin inserted into an optical sensor pin insertion hole of the tape cassette are integrated. 1. A tape end detection device for a tape recorder, characterized in that one of a light emitting element and a light receiving element is provided so as to face the reference pin and the optical sensor pin, respectively.