JPH0450618Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is most suitable for application to tape cassettes for video tape recorders, for example, and is particularly suitable for use with detection holes for detecting cassette information. This invention relates to a tape cassette having a lid member on the bottom surface for opening and closing the detection hole.

[Summary of the invention] This invention consists of a cassette housing consisting of upper and lower halves in which tapes and reels are stored, a lid body for opening and closing the front opening of the cassette housing, and a mounting shaft provided on the bottom plate of the lower half. In the tape cassette, the tape cassette has a lid locking member rotatably attached to the tape cassette, a detection hole provided on the bottom surface of the lower half for detecting cassette information, and a lid member for opening and closing the detection hole. By arranging the lid member on the same plane as the mounting shaft without interfering with the mounting shaft at all, the bottom space of the lower half can be used effectively, and the detection hole The closed state of the detection hole can always be detected reliably by firmly positioning the lid member, which is configured to be vertically movable within the lid, in the lowered position.

[Conventional technology]

Regarding tape cassettes for video tape recorders, for example, as seen in the earlier application filed by the applicant of this invention (Utility Application No. 16744-1983),
Some cassette tapes have a detection hole for detecting various types of cassette information such as tape type, tape thickness, and prevention of erroneous erasure, and a lid member for opening and closing the detection hole on the bottom surface of the lower half of the cassette housing.

In this type of tape cassette, the detection hole is set in advance to be open or closed by the lid member according to the cassette information to be detected, and when the tape cassette is attached to a video tape recorder, the information of the video tape recorder can be detected. The cassette information described above can be detected by detecting the open/closed state of the detection hole using a pin.

At this time, when the detection hole is in the closed state, the information detection pin is pushed down by the lid member against elasticity, and when the detection hole is in the open state, the information detection pin is not pushed down and the information is detected. The pin is inserted into the detection hole, and the cassette information signal is detected based on the difference in height of the information detection pin (whether it is pressed down or not).

Therefore, the detection hole must have a height (depth) that allows the information detection pin to be inserted, and the detection hole must not have a structure in which the lid member is moved up and down within the detection hole as in the previous application. , a vertical movement stroke of the lid member is also required. For this reason, when a detection hole and a lid member are provided on the bottom of the lower half, the detection hole and lid member are attached to various parts (tape, reel, tape guide, various mounting shafts, etc.) located on the lower half.
It can only be placed in limited positions where it will not interfere with the

In addition, in the prior application, in order to prevent the detection hole and the lid member from interfering with the reel, there is a substantially triangular shape between the reels located at the center rear of the substantially trapezoidal bottom opening provided on the bottom of the lower half. placed within the space.

[Problem that the invention attempts to solve]

Incidentally, in recent years, in this type of tape cassette, in parallel with the diversification of tape types and tape thicknesses, it has been desired to increase the amount of information contained in the cassette. There is a need.

However, as described above, there is a natural limit to the arrangement space for providing a large number of detection holes and lid members on the bottom surface of the lower half without any interference with various members located on the lower half.

This invention was devised to solve these problems, and consists of a cassette housing consisting of an upper and lower half in which tapes and reels are stored,
a lid body for opening and closing the front opening of the cassette case;
A lid locking member rotatably attached to a mounting shaft provided on the bottom plate of the lower half, a detection hole provided on the bottom of the lower half to detect cassette information, and a lid that opens and closes the detection hole. In the tape cassette having a member, the detection hole and the lid member are disposed in the same plane as the mounting shaft without interfering with the mounting shaft at all, and the detection hole is arranged in a closed state and an open state. In order to switch to the detection hole, a lid member configured to be vertically movable within the detection hole is firmly positioned at a lowered position that closes the detection hole.

[Means for solving problems]

The tape cassette of this invention is provided with a mounting plate raised up from the bottom plate of the lower half at a predetermined height, the mounting shaft is provided on the upper part of the mounting plate, and the detection hole is connected to the bottom surface of the lower half. The lid member is provided at a predetermined height in the lower part of the mounting plate, and the lid member is provided in the detection hole so as to be movable up and down, and the lid member that is moved up and down in the detection hole is in a lowered position that closes the detection hole. Means for positioning the lid member between the raised position and the open state is provided, and means for pressing the lid member from the raised position to the lowered position is provided.

[Effect]

According to the tape cassette of this invention, a space is formed below the mounting shaft by mounting the mounting shaft so as to float it a predetermined height above the bottom plate of the lower half, and the space under the mounting shaft is used for detection. Since the hole and the cover member are arranged, the detection hole and the cover member can be arranged in the same plane as the mounting axis without interfering with the mounting axis at all. Moreover, in order to switch the detection hole between the closed state and the open state, the lid member, which is moved up and down within the detection hole, is moved by the positioning means and the pressing biasing means at the lowered position where the detection hole is closed. It can be firmly positioned.

〔Example〕

An embodiment in which this invention is applied to a tape cassette (beta cassette) for a video tape recorder will be described below with reference to the drawings.

First, the entire tape cassette will be explained with reference to FIGS. 5 and 6.

This tape cassette has a tape (magnetic tape) 4 wound around a pair of left and right reels 5a and 5b and stored in a cassette housing 3 consisting of upper and lower halves 1 and 2 made of synthetic resin.

A pair of left and right fulcrum shafts 8a are integrally provided at both left and right ends 7a and 7b of the lid body 7, which is molded from synthetic resin and has a substantially U-shape, for opening and closing the front opening 6 of the cassette housing 3. , 8b to be rotatably attached to the cassette housing 3 in the directions of arrows a and b in FIG. A substantially trapezoidal bottom opening 9 is provided on the front end side (lower side in FIG. 5) of the bottom plate 2a of the lower half 2 and connected to the front opening 6, and the tape 4 is attached to the bottom half of the lower half 2. A pair of left and right entrance/exit tape guides 1 provided on the bottom surface 2a of 2.
It is guided by 0a and 10b and spans along the front opening 6 and across the bottom opening 9.

Then, within the cassette housing 3, the lid locking member 13 is rotated in the directions of arrows c and d in FIG. It can be installed freely.
This lid locking member 13 is biased to rotate in the direction of arrow c by a spring 14a, and its front end 13b
By passing a locking pawl 15 provided integrally through one side plate 2b of the lower half 2 and engaging a locking hole 16 provided at one end 7a of the lid 7, the lid 7 can be attached to the sixth The lid is configured to be locked in the closed position shown by the solid line in the figure. Note that when the tape cassette is installed in the video tape recorder, the lid locking member 13 is moved from the locking position shown by the solid line to the unlocking position shown by the chain line in FIG. 5 against the spring 14a by the lid locking member (not shown). When the lid 7 is rotated in the direction of the arrow d, the lock pawl 15 is disengaged from the lock hole 16 in the direction of the arrow d, and the lid 7 is unlocked. Then, the lid body 7 can be opened by rotating in the direction of arrow a from the closed lid position shown by the solid line to the open lid position shown by the chain line in FIG.

In addition, a pair of left and right mounting shafts 17 are provided vertically on the bottom plate 2a of the lower half 2 within the cassette housing 3.
A pair of left and right reel lock members 18 at a and 17b
a and 18b are mounted rotatably in the directions of arrows e and f, respectively, in FIG. These reel locking members 18a, 18b are biased to rotate in the direction of arrow e by a pair of left and right springs 14a, 14b attached to both mounting shafts 17a, 17b, so that the lower reel flanges of the pair of left and right reels 5a, 5b are rotated. The reels 5a and 5b are engaged with teeth 19a and 19b provided on the outer periphery of the reels 5a and 5b, thereby locking the reels 5a and 5b from rotating in the direction of the arrow g in FIG. 5, which is the tape feeding direction. Note that when the tape cassette is attached to the video tape recorder and the lid 7 is opened by rotating in the direction of arrow a in FIG. The lock release pins 20a and 20b move both reel lock members 18a and 18b from the lock position shown by the solid line to the lock release position shown by the chain line in FIG.
The reels 5a and 5b are rotated in the direction of the arrow f against the reels 5a and 14b, and the locks of both reels 5a and 5b are released.

By the way, the spaces around the pair of left and right reels 5a and 5b on the bottom plate 2a of the lower half 2 include the pair of left and right front end corner spaces 22a,
22b, and a pair of left and right rear end corner spaces 23
a, 23b, a front end inter-reel space 24 at the center rear of the bottom opening 7, and a rear end inter-reel space 25 behind it. On the bottom plate 2a of the lower half 2, there are four screw bosses 27 through which four setscrews 26 for screwing the upper and lower halves 1 and 2 are inserted into the four corner spaces 22a, 22b, 23a, and 23b. are integrally provided, and a fitting boss 28 for fitting the upper and lower halves 1 and 2 into the rear end inter-reel space 24 is provided integrally. In addition, both entrance/exit tape guides 10a, 10b, mounting shaft 12, and lid locking member 1 are installed in both front end corner spaces 22a, 22b.
3. Both mounting shafts 17a, 17b, both reel lock members 18a, 18b, and a pair of left and right intermediate tape guides 29a, 29b are provided.

And both rear end corner spaces 23a, 23
Since the lateral groove 30 is provided on the bottom surface 2d of the lower half 2 so as to cross between the two screw fixing bosses 27 in b, the bottom surface 2d of the lower half 2 has both rear end corner spaces 23a, 23b and the rear end corner spaces 23a, 23b. A detection hole and a lid member for detecting cassette information cannot be provided at the lower position of the end reel space 25.

Therefore, normally, cassette information to prevent accidental erasure is stored on the bottom surface 2d of the lower half 2 at a position close to the side plate 2c of the lower half 2 in the front end corner space 22b where the lid locking member 13 is not provided. A detection hole 32 for detection and a break-off lid member 33 for opening and closing the detection hole 32 are provided, and as in the previous application, the remaining front end inter-reel space 24 is used to On the bottom 2d of half 2,
A plurality of detection holes 34a, 34b, 34c for detecting other cassette information, and a plurality of lid members 35a, 35b, 35 for opening and closing these, etc.
c.

Therefore, in accordance with the diversification of tape types, this invention provides a detection hole and a cover member for detecting cassette information to prevent accidental erasure, etc., which are almost the same as the detection hole 32 and cover member 33. It is intended to be provided at a lower position of the mounting shaft 12 of the lid locking member 13 in the other front end corner space 22a so as to be in a symmetrical position.

Therefore, details of the detection hole provided at the lower position of the mounting shaft 12 of the lid locking member 13 and the lid member will be explained with reference to FIGS. 1 to 4.

First, a predetermined height H ₁ from the bottom plate 2a of the lower half 2
A mounting plate 36, which is raised up by 30 degrees, is integrally provided with the bottom plate 2a via a rising portion 37, and a mounting shaft 12 is vertically and integrally provided on the upper part of the mounting plate 36. Note that a guide hole 48 is provided at the center of the mounting shaft 12 so as to pass through the mounting plate 36 downwardly. A notch 38 having a height H ₂ that is approximately the same as the height H ₁ is provided in the lower part of the rear end 13 a of the lid locking member 13 .
a to the outer periphery of the mounting shaft 12 through the insertion hole 39, and attach the lid lock member 13 to the mounting shaft 12 at the fourth position.
It is mounted rotatably in the directions of arrows c and d in the figure.
In addition, on the outer periphery of the upper end of the mounting shaft 12, there is a shaft fixing boss 40 that is integrally provided under the top plate 1a of the upper half 1.
is inserted.

Next, a rectangular detection hole 41 is provided in the bottom surface 2d of the lower half 2 by utilizing a space with a height _H3 below the mounting plate 36. Note that this detection hole 41
is open on two sides, the bottom surface 2a and the side surface 2e of the lower half 2. Then, the above-mentioned 2 of this detection hole 41
A lid member 42 that opens and closes surfaces 2a and 2e at the same time is provided within this detection hole 41. This lid member 42
is a horizontal plate 42 that opens and closes the bottom surface 2d side of the detection hole 41;
a, a vertical plate 42b that opens and closes the side surface 2e, a pair of elastic locking claws 43a and 43b, and a guide shaft 49 provided at the upper part of the approximately central portion of the horizontal plate 42a are made of synthetic resin. The cover member 42 is integrally molded and is configured to be movable up and down within the detection hole 41. Note that the lid member 4 is inserted into a substantially L-shaped notch 44 provided around the mounting plate 36.
2 vertical plate 42b and both locking claws 43a, 43b are inserted from below to above, and one of the locking claws 4
3a is configured to be selectively and elastically engaged with a pair of upper and lower positioning recesses 45a and 45b provided on the inner surface of the side plate 2c of the lower half 2. Further, at this time, the guide shaft 49 is inserted into the guide hole 48 from below, and the lid member 42 is smoothly moved up and down within the detection hole 41 by the guiding action of the guide hole 48 and the guide shaft 49. It is configured as follows.

The locking pawl 43a and the recesses 45a and 45b constitute means for selectively positioning the lid member 42 between the raised position and the lowered position within the detection hole 41. A spring 50 serves as a means for always pressing the lid member 42 from the raised position to the lowered position.
is the guide shaft 4 between the mounting plate 36 and the horizontal plate 42a.
It is inserted and provided on the outer periphery of 9.

With the detection hole 41 and the cover member 42 configured as described above, first, as shown in Figs. 2A and 3A, when the cover member 42 is lowered to the lowered position,
The two faces 2a and 2e of the detection hole 41 are simultaneously covered by the horizontal plate 42a and the vertical plate 42b. At this time, one of the locking claws 43a is in contact with the lower recess 45.
b of the cover member 42 and the other engaging claw 43b of the cover member 42 is brought into contact with the upper end 37a of the rising portion 37. Furthermore, the downward pressing force of the spring 50 firmly positions the cover member 42 in the lowered position.
To lower 2 to the lowered position, the tip 42a' on the side 2e of the horizontal plate 42a is hooked with a fingernail or the like and lowered slightly to disengage the engaging claw 43a from the upper recess 45a, after which it will automatically be lowered by the pressing force of the spring 50.

In this way, the detection hole 41 is connected to the lid member 42.
When the tape cassette is attached to the video tape recorder with the lid closed, the information detection pin 46 of the video tape recorder is pushed down against elasticity by the horizontal plate 42a of the lid member 42, and the detection hole is pushed down by the horizontal plate 42a of the lid member 42. It is detected that 41 is in the closed state.

However, at this time, since the lid member 42 is firmly positioned in the lowered position by the downward pressing force of the spring 50, the lid member 42 is
2, the locking pawl 43a is removed from the recess 45b, and the lid member 42
There is no possibility that the liquid is accidentally raised inside the detection hole 41. Therefore, the lid member 42 is connected to the information detection pin 4
6 can always be reliably pressed down against elasticity, so that the closed state of the detection hole 41 can always be reliably detected.

Next, as shown in FIGS. 2B and 3B, when the lid member 42 is raised to the raised position against the spring 50, the two surfaces 2a and 2e of the detection hole 41 are simultaneously opened. At this time, after one of the locking claws 43a comes off from the lower recess 45b, the upper recess 45
a again, and the lid member 42 is positioned in the raised position. Moreover, in order to raise the lid member 42 to the raised position, it is sufficient to push up the horizontal plate 42a from below.

In this way, the detection hole 41 is connected to the lid member 42.
When the tape cassette is installed in the video tape recorder with the lid opened by the holder, the information detection pin 46 is inserted into the detection hole 41 without being pushed down in any way, and the detection hole 41 is in the open state. is detected.

At this time, the vertical plate 42b of the lid member 42
Since the side surface 2e of 1 also opens and closes, the information detection pin 46
The open/closed state of the detection hole 41 can also be detected by horizontally inserting the detection hole 41 into the detection hole 41 from the side surface 2e side. Note that 47 shown in FIGS. 2A to 3B are both left and right side surfaces 2e of the cassette housing 3.
This is a horizontal guide groove provided along the

Although the embodiments of this invention have been described above, this invention is not limited to the embodiments, and various effective changes can be made based on the technical idea of this invention.

[Effect of idea]

As described above, in the tape cassette of this invention, the detection hole and the lid member do not interfere with the mounting axis of the lid lock member provided on the lower half, and are arranged in the same plane as the mounting axis. This makes it possible to effectively utilize the bottom space of the lower half, thereby increasing the amount of information in the cassette.

However, in order to switch the detection hole between the closed state and the open state, the lid member, which is moved up and down within the detection hole, is moved by the positioning means and the pressing biasing means at the lowered position where the detection hole is closed. Since the information detection pin can be firmly positioned using the lid member, when the tape cassette is installed in a video tape recorder, etc. with the detection hole closed, the information detection pin can be pressed down securely at all times. Therefore, the closed state of the detection hole can always be detected reliably. In other words, this prevents detection errors such as the cover member being unexpectedly raised within the detection hole due to the relative upward thrust by the information detection pin, making it impossible to detect the closed state of the detection hole. can be prevented.

[Brief explanation of the drawing]

The drawings show one embodiment of the tape cassette of this invention, in which Fig. 1 is an exploded perspective view of the main parts, and Figs. 2A and 2B are cross-sections of the main parts in the direction of the arrow in Fig. 4. Figures 3A and 3B are sectional views of the main parts in the direction of the arrows in Fig. 4, Fig. 4 is a plan view of the main parts, and Fig. 5 is a plan view of the whole excluding the upper half;
FIG. 6 is a side view of the whole. In addition, in the symbols used in the drawings, 1... upper half, 2... lower half, 3... cassette housing,
4... Tape, 5a... Reel, 5b... Reel, 6... Front opening, 7... Lid, 12... Mounting shaft, 13... Lid lock member, 36... Mounting plate, 4
1...Detection hole, 42...Lid member, 43a...Latching claw, 43b...Latching claw, 45a...Recess, 45b
. . . recess, 46 . . . information detection pin, 50 . . . spring.

Claims (1)

[Scope of claim for utility model registration] A cassette housing consisting of upper and lower halves in which tapes and reels are stored, a lid body for opening and closing the front opening of the cassette housing, and a mounting shaft provided on the bottom plate of the lower half. A tape cassette having a rotatably mounted lid lock member, a detection hole provided at the bottom of the lower half for detecting cassette information, and a lid member for opening and closing the detection hole, wherein the lower half providing a mounting plate raised up from the bottom plate at a predetermined height, providing the mounting shaft on the top of the mounting plate, and providing the detection hole at a predetermined height on the bottom of the lower half at the bottom of the mounting plate; The lid member is provided in the detection hole so as to be vertically movable, and means for positioning the lid member, which is moved up and down in the detection hole, between a lowered position where the detection hole is closed and a raised position where the detection hole is opened. What is claimed is: 1. A tape cassette comprising: a tape cassette; and means for pressing and biasing the lid member from a raised position to a lowered position.