JPS5894173A - Video tape cassette - Google Patents

Abstract

PURPOSE:To fit a guide roller surely with excellent workability even for a miniature size video tape casette where the area for arranging a fulcrum is very narrow, by inserting a pin to the boss fot the cassette and providing the fulcrum. CONSTITUTION:A projected boss 8 is formed at the position of a guide roller for a cassette half 4 and a cylindrical pin 9 is inserted to form a fulcrum for a guide roller. A cylindrical roller member 10 is freely rotatably inserted and a boss 12 provided for the other cassette half 11 is inserted. The tape guide can be formed by providing the boss for one cassette half only.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to videotape cassettes, and more particularly to microminiature videotape cassettes with guide rollers.

In recent years, moving images have been photographed by a camera equipped with an imaging device such as a camera tube or a CCD in a photoelectric conversion section, and the resulting image information converted into electrical signals is recorded on a magnetic tape by a magnetic head. The video recording method (VTR), in which the image information recorded on the magnetic tape is then read out by a magnetic head and appears as a visible image on a reproducing device such as a CRT, allows easy recording, reproducing, erasing, etc. As is well known, it is widely used in general today due to its advantages.

Magnetic tapes used in VTR systems are generally housed in cassettes so that they can be easily attached to and removed from recording/producing devices. However, since the videotape cassettes commonly used today are quite large in size, the recording and reproducing apparatus has a large size and a large weight. Therefore, there are considerable restrictions on where and how the VTR system can be used. In other words, for example, if you want to take pictures outdoors using a VTR system, you will need to carry a video camera to take the images and a recording device that is separate from the video camera and is also large and heavy. must, 8
Its maneuverability was significantly inferior to conventional small movie cameras such as millimeter cameras.

This situation led to the development of a videotape cassette (hereinafter referred to as an "ultra-compact videotape cassette"), which is significantly smaller than the conventionally used videotape cassette and is about the same size as an audiotape cassette. . Due to its small size, this ultra-compact video tape cassette can be built into a video camera, allowing it to be easily and easily used for filming in the same way as a small movie camera such as a conventional 8mm camera. ,
The advantages of conventional VTR systems, namely recording, playback,
Since it has the advantage of being easily erased, a VTR system that can use the above-mentioned ultra-small video tape cassette is very advantageous in practice. This ultra-compact video tape cassette can be used conventionally by using an adapter.
It is designed so that it can be recorded and played back even in a recording and playback device that is compatible with normal-sized video tape cassettes.

By the way, in conventionally used normal-sized video tape cassettes, as shown in FIG. 1, when there is no recording, the reel 1 transports the fed-out video tape 2 to the part where the magnetic head comes into contact with it. For this purpose, a rotatable guide roller 3 is provided on the tape feeding path.

This guide roller 3 is indispensable in order to send the video tape 2 sent out from the roll 1 to the part where the magnetic head comes into contact with it.

This guide roller has a cylindrical support shaft 6 as shown in FIG. The support shaft 6 is provided in the cassette half 4 by press-fitting a shaped tip, and the cylindrical roller member 7 is inserted into the support shaft 6, which is then formed by the C.C.

Even in the ultra-compact video tape cassette mentioned above, it is essential for transporting the video tape fed from the reel to the part where it comes into contact with the magnetic head, but since the cassette itself is very small, press-fitting is essential. Inserting and fixing the spindle into the spindle fixing hole is a very difficult task, and since the spindle fixing hole is provided very close to the end of the cassette case, it is difficult to insert the spindle into the spindle press-fitting process. It has been found that a problem arises in that the spindle fixing hole overlaps with the spindle, resulting in the spindle not being able to be attached. Furthermore, it is extremely difficult to provide the above-mentioned taper on a minute support shaft that can be adapted to an ultra-small video tape cassette.

Therefore, an object of the present invention is to provide a video tape cassette that can easily and reliably attach a support shaft to an ultra-small video tape cassette in which space for fixing a support shaft for pivotally supporting a guide roller is limited. Our goal is to provide tape cassettes.

This purpose is formed by a first videotape cassette half, a second videocassette half engageable with the first cassette half, and a second videocassette half engageable with the first cassette half. In a videotape cassette having a videotape guide roller on a videotape running path of a cassette case, the guide roller is provided with a boss protruding from an inner surface of at least one of the first and second cassette halves. This was achieved by forming a cylindrical roller member that was rotatably fitted concentrically to a cylindrical pin having a slit in the length direction inserted into the section.

Here, the cassette half refers to one side of a videotape cassette that is formed by being divided into two parts due to assembly reasons, and when the side into which the spindle for driving the reels is inserted is the main body side, the If the first cassette half is on the main body side, the second cassette half is on the lid side, and if the first cassette half is on the lid side, the second cassette half is on the main body side.

According to the present invention, the support shaft of the guide roller can be provided by inserting a cylindrical bottle into the boss portion provided in the kayak roof, so there is no risk of damaging the support shaft fixing hole as described above. In addition, since the complicated work of press-fitting is not involved, it is possible to assemble ultra-small video tape cassettes with many parts installed in minute parts with ease. It also saves you time.

Hereinafter, the videotape cassette of the present invention will be explained in detail with reference to the drawings.

3 and 4 are an exploded perspective view and a sectional view, respectively, showing a first embodiment of the videotape cassette of the present invention.

In this embodiment, a convex boss portion 8 is provided at the guide roller installation position of the cassette half 4 on the main body side. A support shaft of the guide roller is formed by inserting a cylindrical pin 9 having a slit in the length direction into the boss portion 8 .

Here, the inner diameter of the pin 9 is smaller than the maximum outer diameter of the boss portion 8, so that when the pin 9 is inserted into the boss portion 8, the pin 9
It is preferable that the pin 9 is a so-called spring pin having an elastic force that tends to reduce the diameter when the diameter is expanded so that the pin 9 is fixedly installed. In this way, the cylindrical roller member 10 is attached to the pin 9 fixed to the main body side cassette half 4.
The upper part of the pin 9 is engaged with the boss part 12 provided on the lid side cassette half 11 during assembly, so that the pin 9 is aligned parallel to the video tape feeding surface. This makes it possible to stably transport the videotape to the position where it contacts the magnetic head without causing deformation or positional shift.Furthermore, even if excessive force is applied to the guide roller, the pin 9 will not move to the boss. It never deviates from this. Note that since the inner diameter of the cylindrical roller member 10 is rotatable with respect to the pin 9, the boss portion 9
．． It goes without saying that the outer diameter of the pin 9 is larger than the outer diameter of the pin 9 when attached to the pin 12.

5 and 6 are an exploded perspective view and a sectional view, respectively, showing a second embodiment of the videotape cassette of the present invention.

In this embodiment, the boss portion is provided only on the main body side cassette half 4.

As shown in the figure, the length of the convex part of the boss part 8 is longer than that of the previous embodiment, so that even if the pin 9 is held at one point, it is always parallel to the videotape feeding surface. It is gaining support.

It goes without saying that the boss portion may be provided only on the lid side cassette half instead of only on the main body side cassette half as in this embodiment.

7 and 8 are an exploded perspective view and a sectional view, respectively, showing a third embodiment of the videotape cassette of the present invention.

In this embodiment, as shown in the figure, a boss portion 8 provided on the main body side cassette half 4 has a cylindrical portion 8 at its bottom. The outer diameter of this cylindrical portion 8' is smaller than the inner diameter of the cylindrical roller member 10, and it is necessary that there is a difference between the tip end of the boss portion and its diameter. If such a boss portion 8 is provided, the cylindrical roller member 10 is first inserted into the cylindrical portion 8 of the boss portion during assembly, and then the pin 9 is inserted into the cylindrical roller member 10.
is inserted through the hollow part of the cylindrical roller member 10,
Since the pin 9 can be fixed to the tip of the boss part 8, the effort of inserting the small pin 9 into the small boss part 8 can be omitted, resulting in an advantage that assembly is simplified.

Note that it is also possible to provide a boss portion with a cylindrical bottom portion on the lid-side cassette half as in the above-mentioned ★ example, and it is also possible to provide only the boss portion with a cylindrical bottom portion on the main body side or on the lid-side cassette half. It goes without saying that it is also possible to provide it only in either one.

As described above in detail, the videotape cassette of the present invention is provided by inserting a pin into the boss portion provided on the cassette instead of providing the support shaft in the cassette by press-fitting the support shaft into the support shaft fixing hole. By providing the support shaft, the guide roller can be mounted reliably and with good workability even in ultra-small video tape cassettes in which only a small area for providing the support shaft is available.

[Brief explanation of the drawing]

1 and 2 are a schematic diagram and an exploded perspective view, respectively, for explaining a conventional guide roller, and FIGS. 3 and 4 are an exploded perspective view and a cross-sectional view, respectively, showing a first embodiment of the present invention. 5 and 6 are an exploded perspective view and a sectional view, respectively, showing a second embodiment of the present invention, and FIG. 7, and FIG. 8 are an exploded perspective view and a sectional view, respectively, showing a third embodiment of the present invention. They are a perspective view and a sectional view. 1・・・・・・・・・・・・・・・Reel 2・
・・・・・・・・・・・・Video tape 3・・・・・・・
...Guide roller 4-...Main body side cassette half 5......Spindle fixing hole 6...
・・・・・・・・・・・・・・・・Spindle 7.10...
...Cylindrical roller member 8, 12...-...
...Boss part 8...Cylindrical bottom part of the boss part 9.
・・・・・・・・・・・・Cylindrical pin 11・・・Lid side cassette half Figure 1 Figure 3 Figure 4 Figure 7 (Voluntary) Procedural amendment February 4, 1982 Mr. Commissioner of the Japan Patent Office, 1. Indication of the case: Patent Application No. 192046, filed in 1982. 2. Title of the invention: Hiteo Kaap Kaya. 3. Relationship with the person making the amendment No patent applicant 6. Number of inventions increased by the amendment

Claims (1)

Claims: 1) a first video cassette half, a second video power set 7 engageable with the first cassette half, and a first cassette half and a second cassette half; In the videotape cassette, the videotape guide roller is provided on the videotape running path of the cassette case formed by the engagement of the first and twentieth cassette holes 1-7. - The cylindrical roller member is rotatably fitted concentrically to a cylindrical pin having a longitudinal slit inserted into a boss portion protruding from the inner surface of at least one of the parts. videotape cassette. 2) The videotape cassette according to claim 1, wherein the cylindrical pin is a spring pin.