JPH0728630Y2 - Transparent window plate of tape cassette - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] In this invention, a pair of left and right cylindrical portions for guiding the movement of a reel pressing member that holds a pair of left and right reels are integrally molded on the lower surface with synthetic resin. The present invention relates to a transparent window plate of a tape cassette, and is most suitable for a transparent window plate of a tape cassette for a video tape recorder.

[Outline of device]

In this invention, a pair of left and right cylindrical portions for guiding the movement of a reel pressing member that holds a pair of left and right reels is integrally molded on the lower surface of a synthetic resin into a transparent window plate of a tape cassette. A pair of left and right annular recesses that respectively correspond to the cylindrical portions and are one step lower than the upper surface of the transparent window plate are provided on the upper surface of the transparent window plate and directly above each of the pair of left and right cylindrical portions. By preventing the transparent window plates from rubbing against each other when the transparent window plates are stacked on each other, it is possible to prevent the scratches due to the rubbing.

[Conventional technology]

A conventional example of a tape cassette for a video tape recorder will be described with reference to FIGS.

First, as shown in FIG. 4, a pair of left and right reels 2 around which a magnetic tape 1 is wound are rotatably housed in a cassette housing 3 composed of an upper half 3a and a lower half 3b. The magnetic tape 1 is guided by a pair of left and right tape guides (not shown) provided in the cassette housing 3 and hung along the inside of a front lid 5 which is openably and closably attached to the cassette housing 3. There is.

A long rectangular window 6 is provided along the longitudinal direction of the cassette housing 3 in a substantially central portion of the upper half 3a. Further, a transparent window plate 8 is attached to the window 6 so that the inside of the cassette housing 3 can be observed through the transparent window plate 8 such as visually recognizing the remaining amount of the magnetic tape 1. For the above-mentioned mounting of the transparent window plate 8, a stepped portion 9 is provided on the peripheral edge of the transparent window plate 8, the stepped portion 9 is fitted into the window 6, and the thin portion of the transparent window plate 8 caused by the stepped portion 9 is formed. The portion 10 is overlapped with the periphery of the window 6 and is welded or adhered.

The pair of left and right reels 2 is a pair of left and right reel holders 11.
As shown in FIG. 5, the magnetic tape 1 is pressed against the lower half 3b so that the reel 2 does not rotate or move when not in use, and the magnetic tape 1 is not loosened.

That is, the transparent window plate 8 is made of a synthetic resin such as acrylic resin, and the lower surface 8b of the transparent window plate 8 is located at the right and left above the hubs 12 provided at the centers of the pair of reels 2, respectively. A pair of cylindrical portions 15 are integrally projected, and a concave portion 17 having a through hole 16 concentric with the cylindrical portions 15 is provided on the upper surface 8a.

The pair of left and right reel retainers 11 has a large diameter portion 18 slidingly contacting the inner surface of the cylindrical portion 15 and a small diameter portion 19 slidingly contacting the through hole 16.
The reel retainer 11 is urged downward in FIG. 5 by a compression spring 22 interposed between the large diameter portion 18 and the upper half 3a. In addition, since the flange 23 having a diameter larger than that of the through hole 16 is provided at the upper end of the reel presser 11 in the figure, there is no possibility that the reel presser 11 comes out of the through hole 16.

Next, the pair of left and right reels 2 are constructed by assembling and welding upper and lower flanges 24 and 25 formed of synthetic resin at their respective hub portions 12a and 12b as shown in FIG. However, in the case of the above combination, a thin metal plate 26 is interposed between the upper and lower hub portions 12a and 12b, and the reel retainer 11 abuts against this thin plate 26 so that the reel 2 can be pressed downward as described above. Has been done.

[Problems to be solved by the invention]

By the way, the transparent window plate 8 must be transparent even if it gets tired so that the inside of the cassette housing 3 can be observed as described above. Further, even if an unexpected slight scratch is made on the upper surface 8a of the transparent window plate 8, the transparent window plate 8 is easily noticeable, and the commercial value is significantly reduced.

Therefore, if the transparent window plates 8 after the synthetic resin molding and before being assembled into the upper half 3a are transported in a stacked state as shown in FIG. 6, the transparent window plates 8 are rubbed against each other due to vibration or the like. The upper surface 8a of the lower transparent window plate 8 is easily damaged at the lower end of the cylindrical portion 15 of the transparent window plate 8. In particular, if the transparent window plates 8 are stacked immediately after being molded with synthetic resin, the above-mentioned scratches are significant, so at the molding site, the transparent window plates 8 are arranged horizontally so as not to be stacked immediately after molding. As a result, it was necessary to make the storage space of the transparent window plate 8 very large at the molding site.

In view of the above points, the present invention positively forms an annular recess on the upper surface of the transparent window plate, so that even if the transparent window plates are stacked or transported or stored, the transparent window plate has a sense of quality. It is intended to provide a transparent window plate of a tape cassette which is not likely to be damaged.

[Means for solving problems]

The present invention provides a transparent window plate of a tape cassette in which a pair of left and right cylindrical portions for guiding the movement of a reel pressing member that holds the pair of left and right reels is integrally molded on the lower surface thereof with a synthetic resin. A pair of left and right annular recesses that respectively correspond to the cylindrical portions and are one step lower than the upper surface of the transparent window plate are provided on the upper surface of the transparent window plate and directly above each of the pair of left and right cylindrical portions. A transparent window plate of a tape cassette, characterized in that, when the transparent window plates are stacked on top of each other, the lower end of each cylindrical portion is inserted and positioned in each annular recess. is there.

〔Example〕

An embodiment in which the present invention is applied to a transparent window plate of a tape cassette for a video tape recorder will be described below with reference to FIGS. The parts having the same structures as those shown in FIGS. 4 to 6 are designated by the same reference numerals and the description thereof will be omitted.

Reference numeral 29 in FIG. 1 denotes a pair of left and right annular recesses provided on the upper surface 8a of the transparent window plate 8. The annular recess 29 is the lower surface 8b of the transparent window plate 8.
It occupies a position directly above the cylindrical portion 15 provided in the. The cross-sectional shape of the annular recess 29 is similar to the cross-sectional shape of the lower end 15a of the cylindrical portion 15.

Therefore, as shown in FIG. 1, it is extremely easy to insert and remove the lower end 15a of the cylindrical portion 15 of the upper transparent window plate 8 into the annular recess 29 of the lower transparent window plate 8. Further, when the upper and lower transparent window plates 8 are fitted to each other, the upper and lower transparent window plates 8 are restrained from each other, so that relative displacement in the plate surface direction is prevented. The degree of fitting in this case may be appropriately selected, but if the fitting is a stop fitting, even if external force in the vertical direction unexpectedly acts on the transparent window plates 8 stacked on each other, the upper and lower transparent window plates are There is an effect that the engagement of 8 is hard to be released. Although acrylic resin or the like is used as the material for the transparent window plate 8, other transparent synthetic resins may be used instead.

Next, FIGS. 2 and 3 show a transparent and thin plastic container 30 in which a plurality of transparent window plates 8 stacked on each other in the above-described manner are provided.
Shows the state of being housed in. The height of the container 30 is substantially the same as the height of the plurality of transparent window plates 8 stacked on each other.

By the way, the width and length of the container 30 are substantially the same as the dimensions of the transparent window plate 8. Therefore, the transparent window plate 8 can be easily removed from the container 30.
Projecting portions 31 are provided on both side surfaces in the longitudinal direction of the container 30 so that the container can be taken in and out. Again container 30
The lid 32 that closes the upper part of the is configured as an inro cage type as shown in FIG.

An annular protrusion 33 is provided on the lower surface of the lid 32 so as to correspond to the annular recess 29 of the transparent window plate 8 housed in the container 30. When the container 30 is covered with the lid 32, the annular projection 33 fits into the annular recess 29 of the uppermost transparent window plate 8. Similarly, the bottom of the container 30 is provided with an annular recess 36 corresponding to the cylindrical portion 15 of the transparent window plate 8 housed in the container 30. Then, among the transparent window plates 8 housed in the container 30, the cylindrical portion 15 of the lowermost transparent window plate 8 fits into the annular recess 36. Thus, the plurality of transparent window plates 8 stacked on each other is securely fixed in the container 30.

Since the transparent window plate 8 of the tape cassette for video tape recorder is constructed as described above, the cylindrical portion of the upper transparent window plate 8 is
A plurality of transparent window plates 8 can be stacked at a desired height by fitting the lower end 15a of 15 into the annular recess 29 of the lower transparent window plate 8 as shown in FIG.

Moreover, the plurality of transparent window plates 8 stacked above each other are
Relative sliding of the transparent window plate 8 in the plate surface direction by the above fitting of the lower end 15a of 15 and the annular recess 29 (rubbing against each other)
Will not occur. Therefore, even if the transparent window plates 8 are stacked as described above, there is no risk that the upper surface 8a of the transparent window plates 8 will be scratched by the lower end 15a of the cylindrical portion 15 and damaged. Further, disassembling the plurality of stacked transparent window plates 8 is extremely simple because it is only necessary to remove the cylindrical portion 15 from the annular recess 29.

Next, by accommodating the plurality of stacked transparent window plates 8 in the container 30 and closing the lid 32, the plurality of transparent window plates 8 are fixed to the container 30 as described above. Therefore, even if the transparent window plate 8 jumps in the container 30 due to vibration or the like during transportation, there is no possibility that the upper surface 8a of the transparent window plate 8 will be damaged.

Furthermore, since the container 30 is provided with the protruding portions 31, it is easy to insert a finger into the pair of protruding portions 31 and sandwich the transparent window plate 8 with the fingers. Therefore, the insertion / removal of the transparent window plate 8 into / from the container 30 can be performed extremely easily and freely.

The embodiments of the present invention have been described above, but the present invention is not limited to the embodiments, and various effective modifications can be made based on the technical idea of the present invention.

The embodiment is an example in which the present invention is applied to a transparent window plate of a tape cassette for a video tape recorder, but the present invention can be widely applied to transparent window plates of various tape cassettes used for various purposes. it can.

[Advantages of the Invention] Since the present invention is configured as described above, when a plurality of transparent window plates according to the present invention are stacked on top of each other and then transported, even if the inside of the annular recess of the transparent window plate is on the upper surface side. Even if it is rubbed and damaged by the cylindrical portion of another transparent window plate that is stacked on the upper surface of the transparent window plate, the upper surface of the transparent window plate is not rubbed and damaged by the cylindrical portion. Since the width is narrow, even if the inside of the annular recess is damaged, it is not conspicuous, and for this reason, even if the transparent window plate is rubbed by the cylindrical portion of another transparent window plate stacked on the upper surface side and damaged, There is no loss of quality.

Further, since a large number of transparent window plates can be stacked on top of each other without damaging the upper surface of the transparent window plate according to the present invention, the storage space at the molding site can be saved, and the number management can be facilitated. Further, since it is not necessary to wrap the transparent window plates one by one, the cost can be reduced.

Further, since the lower ends of the pair of left and right cylindrical portions of the transparent window plate according to the present invention are inserted into the pair of left and right annular recesses of another transparent window plate which is stacked on the lower surface side thereof, a single cylindrical portion is formed. The lower transparent window plate and the transparent window plate stacked on the upper side of the lower transparent window plate are relatively rotated around the cylindrical portion as compared with the case where the lower end of the It is always positioned correctly in the upper and lower directions without any need to do so, and therefore, it is easy to handle when a large number of transparent window plates are stacked on each other.

Further, since the concave portion provided on the upper surface of the transparent window plate for inserting the cylindrical portion for guiding the movement of the reel pressing member for pressing the reel is annular, a transparent window is provided in the cylindrical portion for attaching the reel pressing member to the transparent window plate. The strength of the reel retainer locking portion provided on the plate does not substantially decrease, and the reel retainer retaining portion and the reel retainer member are interposed between the reel retainer retaining member and the reel retainer member in order to urge the reel retainer member toward the reel. The installation space for the coil spring is not reduced.

[Brief description of drawings]

1 to 3 show an embodiment in which the present invention is applied to a transparent window plate of a tape cassette for a video tape recorder. FIG. 1 is a vertical sectional view of two transparent window plates which are the same as each other. 2 is a perspective view of a container accommodating a predetermined number of stacked transparent window plates, and FIG. 3 is a vertical sectional view of FIG. Further, FIGS. 4 to 6 show a conventional transparent window plate,
FIG. 4 is a perspective view of a tape cassette for a video tape recorder using a transparent window plate, and FIG. 5 is a partial sectional view of the same.
FIG. 6 is a vertical sectional view of two transparent window plates which are the same as each other and which are stacked on each other. Further, in the reference numerals used in the drawings, 2 ... reel 6 ... window 8 ... transparent window plate 8a ... upper surface 8b ... lower surface 11 ... reel retainer 15 ... cylindrical portion 15a ... lower end 29 ... annular recess Is.

Claims (1)

[Scope of utility model registration request] 1. A transparent window plate of a tape cassette, wherein a pair of left and right cylindrical portions for guiding the movement of a reel pressing member for holding the pair of left and right reels is integrally molded on the lower surface thereof with a synthetic resin. A pair of left and right annular recesses respectively corresponding to the cylindrical portion of the transparent window plate and one step lower than the upper surface of the transparent window plate, provided on the upper surface of the transparent window plate and directly above each of the pair of left and right cylindrical portions, A transparent window plate for a tape cassette, characterized in that, when a plurality of transparent window plates are stacked on top of each other, the lower end of each cylindrical portion is inserted and positioned in each annular recess.