JPH06103728A - Recording medium storage cassette - Google Patents

Abstract

PURPOSE:To optically detect a miserasing preventing state or an erasable state by emitting light from a light emitting element through a miserasing preventing detection hole and/or a miserasing preventing operation window of a cassette and receiving the light. CONSTITUTION:A prism 11 corresponding to the miserasing preventing detection hole 9 is disposed in a cassette corner part 4, and the light from the light emitting element 17 is introduced from a lower surface 14, and the light is derived from a slant surface 15 through the miserasing preventing operation window 10 and is received by a light receiving element 18. Consequently, in the erasable state where the miserasing preventing detection hole 9 and the miserasing preventing operation window 10 are blocked by a miserasing preventing plug 5, the light from the light emitting element is interrupted, on the other hand, in the opening state of the detection hole 9 and the operation window 10, an optical path of the light to be incident on the light receiving element 18 is formed so that the miserasing preventing state can be detected. By this method, the miserasing preventing state can be detected optically as well as mechanically, and these ways of detection can be used properly as occasion demands.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium accommodating cassette which is applied to, for example, an 8 mm video tape cassette having an erroneous erasing prevention function for preventing erroneous erasing of recorded information.

[0002]

2. Description of the Related Art Conventionally, an erroneous erasure prevention plug for preventing erroneous erasure of tape recorded information is generally provided in a tape cassette for so-called raw tape which can be recorded and erased. For example, in the case of a tape cassette for 8 mm video, this accidental erasure prevention plug has a part of the erroneous erasure prevention detection hole formed by sliding the plug claw hook facing the erroneous erasure prevention operation window to the left and right. By opening and closing, the tape record information can be switched between the erasable state and the erroneous erasure prevention state, and a detection pin can be mechanically applied to the erroneous erasure prevention detection hole for detection.

In the erroneous erasure prevention state in which the erroneous erasure prevention detection hole is opened, the above-mentioned erroneous erasure prevention operation window corresponds to the colored portion formed on the erroneous erasure prevention plug. it's shown.

[0004]

By the way, recently, there is a reliable and inexpensive method which is performed optically like the detection of the tape end. In this optical method, since the light emitting sensor and the light receiving sensor can be arranged at a distance,
For example, in an apparatus in which large and small cassettes having different cassette sizes can be used, there is an advantage that the light emitting sensor and the light receiving sensor can be arranged particularly at a position where they do not interfere with the large cassette. However, there is no proposal that can optically detect the erroneous erasure prevention state and the erasable state.

The present invention has been made to solve the above-mentioned problems, and is a recording medium capable of optically detecting the erroneous erasure prevention state and the erasable state as well as the conventional mechanical detection. The purpose is to obtain a storage cassette.

[0006]

In order to achieve the above-mentioned object, the recording medium storage cassette according to the present invention is erroneously set to a record erasable state by opening and closing the detection hole by the plug by the sliding operation of the erroneous erasure prevention plug. A detection hole and / or erroneous erasure in a recording medium storage cassette equipped with an erroneous erasure prevention plug that can be switched to the erasure prevention state and that allows the erroneous erasure prevention plug to enter and exit the erroneous erasure prevention operation window in accordance with the above operation. Using the prevention operation window, the light from the light emitting element is refracted and emitted from the light guide stored in the recording medium storage cassette and is received by the light receiving element so that the erasure prevention state or the erasable state can be detected. Is.

[0007]

In the recording medium accommodating cassette of the present invention configured as described above, the light from the light emitting element enters through the detection hole and / or the display window in the open state, and this light is guided by the light guide member accommodated in the cassette. The light is refracted and then emitted from the detection hole and / or the erroneous erasure prevention operation window in the open state and received by the light receiving element, whereby the erroneous erasure prevention state or the erasable state can be optically detected.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of a recording medium accommodating cassette according to the present invention will be described below with reference to the accompanying drawings by taking an 8 mm video tape cassette as an example.

Embodiment 1 FIG. 1 is an exploded perspective view showing an erroneous erasure prevention mechanism of an 8 mm video tape cassette, FIG. 2 is a cross sectional view of the erroneous erasure prevention mechanism, and FIG. 2 is a vertical cross-sectional view taken along line AA of 2. The erroneous erasure prevention mechanism is indicated by reference numeral 1 as a whole,
The housing of the erasure prevention mechanism 1 includes a lower half 2 and an upper half 3.
It is configured in the cassette corner portion 4 which is integrated with. Reference numeral 5 denotes an erroneous erasure prevention plug. The erroneous erasure prevention plug 5 is provided with a plug claw hook portion 6, a click spring portion 7 and a lid portion 8 for opening and closing an erroneous erasure prevention detection hole 9 which will be described later.

The erroneous erasure prevention detection hole 9 is provided on the bottom surface of the lower half 2 together with other detection holes (not shown). Also,
An erroneous erasure prevention operation window 10 is provided across the lower half 2 and the upper half 3.

The erroneous erasure prevention operation window 10 described above can be opened and closed by sliding the erroneous erasure prevention plug 5.
The erroneous erasure prevention detection hole 9 can be opened / closed by the lid portion 8 in accordance with the sliding operation of the erroneous erasure prevention plug 5.

More specifically, in the erroneous erasure prevention plug 5, when the erroneous erasure prevention operation window 10 is closed, the erroneous erasure prevention detection hole 9 is closed by the lid portion 8. In this state, the tape recording information (not shown) can be erased.

Further, when the erroneous erasure prevention plug 5 is in the opened state of the erroneous erasure prevention operation window 10, the erroneous erasure prevention detection hole 9 has a lid portion 8.
The tape recording information is erroneously erased from this state.

A prism 11 made of, for example, a transparent plastic material serving as a light guide is arranged in the cassette corner 4 in correspondence with the erroneous erasure prevention detection hole 9. A support member 12 is attached to the prism 11, and the support member 12 is supported in a support recess 13 formed in the lower half 2 to fix the position of the prism 11. Further, the prism 11 has a lower surface serving as an introduction surface 14 for the light incident from the erroneous erasure prevention detection hole 9 described above, and an upper surface formed as an inclined surface which serves as a refraction surface 15 for the light incident into the prism 11 and exits from this. The emitted light is led out from the erroneous erasure prevention operation window 10.

The tape cassette thus constructed is mounted on an 8 mm video device to reproduce the tape.
At the tape cassette mounting position, a light emitting element 17 such as an LED corresponding to the erroneous erasure prevention detection hole 9 and a light receiving element 18 corresponding to the erroneous erasure prevention operation window 10 on the 8 mm video device side.
Are arranged.

The erroneous erasure prevention mechanism constructed as described above is operated as follows. In the so-called erroneous erasure prevention state in which the erroneous erasure prevention detection hole 9 is opened, the tape cassette is attached to the video device, and the detection pin as a switch mechanism is inserted into the erroneous erasure prevention detection hole 9 to mechanically prevent the erroneous erasure prevention state. What can be detected can be performed in the same manner as in the past.

Therefore, in the present invention, in addition to the method of mechanically detecting the erroneous erasure prevention state, the erroneous erasure prevention state can be optically detected. That is, when the tape cassette is attached to the video device, the light emitting element 17
Light from the erroneous erasure prevention detection hole 9 enters the cassette and enters the prism 11 through the introduction surface 14 of the prism 11. Here, the light is refracted and reflected at a right angle by the refraction surface 15 to prevent erroneous erasure. After being led out of the cassette through the operation window 10, the light is received by the light receiving element 18.

Therefore, the erroneous erasure prevention mechanism of the present invention blocks the light from the light emitting element 17 in the erasable state in which the erroneous erasure prevention detection hole 9 and the erroneous erasure prevention operation window 10 are closed by the erroneous erasure prevention plug 5. The erasure prevention detection hole 9
When the erroneous erasure prevention operation window 10 is open, the light emitting element 1
Light from 7 passes through the erroneous erasure prevention detection hole 9 and the prism 11
It is possible to detect the erroneous erasure prevention state by forming an optical path which is refracted by the light and passes through the erroneous erasure prevention operation window 10 to enter the light receiving element 18.

Embodiment 2 FIG. 4 is an exploded perspective view of an erroneous erasure prevention mechanism of an 8 mm video tape cassette, FIG. 5 is a cross sectional view of the erroneous erasure prevention mechanism, and FIG. 5 is a vertical cross-sectional view taken along the line BB of FIG. 5, and the same parts as those in the first embodiment are designated by the same reference numerals and duplicate description will be omitted.

In this example, the erroneous erasure prevention operation window 10 is used for the entrance hole for the light from the light emitting element 17 and the exit hole for entering the light receiving element. That is, the prism 20 is arranged corresponding to the erroneous erasure prevention operation window 10. The prism 20 has its support member 21 supported by a support recess 22 formed in the lower half 2 and fixed in position. Prism 2
Reference numeral 0 indicates a light introduction surface 23 of the light incident from the erroneous erasure prevention operation window 10.
a and a lead-out surface 23b that similarly exits toward the erroneous erasure prevention operation window 10, and the opposite surfaces thereof are light refracting surfaces 24a and 24b formed in a V-shaped inclined surface.

In the erroneous erasure prevention mechanism constructed as described above, in the erroneous erasure prevention state in which the erroneous erasure prevention operation window 10 is opened, the light from the light emitting element 17 passes through the erroneous erasure prevention operation window 10 and the introduction surface of the prism 20. 23a, refracting surface 2
The erasure prevention operation window 10 is refracted at 4a at a right angle and further at a refraction surface 24b at a right angle and then led out from the lead-out surface 23b.
It is possible to detect an erroneous erasure prevention state by forming an optical path through which light is received by the light receiving element 18 through

Embodiment 3 FIG. 7 is an exploded perspective view showing an erroneous erasure prevention mechanism of an 8 mm video tape cassette, FIG. 8 is a cross sectional view of the erroneous erasure prevention mechanism, and FIG. 8 is a vertical sectional view taken along the line CC of FIG.

In this example, an erroneous erasure prevention detection hole 9 is provided for the incident hole for the light from the light emitting element 17 and the emission hole for entering the light receiving element.
This is the case when another detection hole other than the above is used. That is, another detection hole 25 is provided in the lower half 2 adjacent to the erroneous erasure prevention detection hole 9.
Is open. In the erasable state in which the erroneous erasure prevention detection hole 9 is closed by the lid 8 of the erroneous erasure prevention plug 5, the erroneous erasure prevention operation window 10 is open, and the erroneous erasure prevention detection hole 9 is opened. Erase erasure prevention operation window 10
Is closed by the accidental erasure prevention plug 5.

A prism 26 is arranged corresponding to the above-mentioned two detection holes 9 and 25. The prism 26 has its support member 27 supported in a support recess 28 formed in the lower half 2 and fixed in position. The lower surface of the prism 26 serves as an entrance surface 29a for the light entering from the detection hole 25 and a lead-out surface 29b for exiting toward the erroneous erasure prevention detection hole 9, and the upper surface refracts the light formed in the V-shaped inclined surface. Faces 30a, 30b
Has become.

The erroneous erasure prevention mechanism configured as described above is provided in the erroneous erasure prevention state in which the erroneous erasure prevention detection hole 9 is opened.
Light from the light emitting element 17 passes through the detection hole 25 and the prism 2
The light enters from the introduction surface 29a of No. 6, is refracted at a right angle by the refracting surface 30a, is further refracted at a right angle by the refracting surface 30b, is led out from the lead-out surface 29b, passes through the erroneous erasure prevention detection hole 9, and is received by the light receiving element 18. It is possible to form an optical path and detect the erroneous erasure prevention state.

Further, even in the case of the second and third embodiments described above, in a so-called erroneous erasure prevention state in which the erroneous erasure prevention detection hole 9 is opened, a detection pin as a switch mechanism is inserted into the erroneous erasure prevention detection hole 9 to cause an erroneous operation. The erasure prevention state can be mechanically detected as in the conventional case.

The present invention is not limited to the embodiments described above and shown in the drawings, and various modifications can be made without departing from the scope of the invention.

For example, in the embodiment, the case in which the erroneous erasure prevention detection hole 9 and the erroneous erasure prevention operation window 10 are opened is referred to as the erroneous erasure prevention state, and this is optically detected. 9 and the erroneous erasure prevention operation window 10 may be opened to make the state erasable, and this may be optically detected.

Further, the incident direction and the outgoing direction of the light emitting element 17 with respect to the prisms 11, 20, and 26 or the angle of the optical path can be easily implemented other than those of the embodiments.

Further, the example in which the supporting members of the prisms 11, 20, and 26 are supported by press fitting into the supporting recesses formed in the lower half 2 has been described, but the supporting members are fixed to the lower half 2 directly by welding or the like. May be.

Further, the erroneous erasure prevention mechanism in the recording medium accommodating cassette of the present invention has been described as applied to the tape cassette for 8 mm video, but it can also be applied to the cassette of DAT (digital audio tape).

[0032]

As described above, in the recording medium storage cassette according to the present invention, by sliding the erroneous erasure prevention plug, the plug opens and closes the detection hole to switch between the record erasable state and the erroneous erasure prevention state. In a recording medium storage cassette equipped with an erroneous erasure prevention plug that enables the erasure prevention plug to enter and exit the display window in accordance with the above operation, a detection hole and / or an erroneous erasure prevention operation window is used to Light is refracted and emitted from the light guide stored in the recording medium storage cassette and can be received by the light receiving element, so that erroneous erasure prevention state and erasable state can be detected by conventional mechanical detection and optical detection. The effect is that they can be used as needed.

The recording medium storage cassette of the present invention is
It is very suitable for use in an apparatus in which large and small cassettes having different cassette sizes can be used.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an erroneous erasure prevention mechanism of this example.

FIG. 2 is a cross-sectional view of an erroneous erasure prevention mechanism of this example.

FIG. 3 is a vertical cross-sectional view taken along the line AA of FIG.

FIG. 4 is an exploded perspective view of another example of the erroneous erasure prevention mechanism of the present example.

5 is a cross-sectional view of the erroneous erasure prevention mechanism of FIG.

6 is a vertical sectional view taken along the line BB of FIG.

FIG. 7 is an exploded perspective view of another example of the erroneous erasure prevention mechanism of the present example.

8 is a cross-sectional view of the erroneous erasure prevention mechanism of FIG.

9 is a vertical sectional view taken along the line CC of FIG.

[Explanation of symbols]

 1 erroneous erasure prevention mechanism 2 lower half 3 upper half 4 cassette corner portion 5 erroneous erasure prevention plug 8 lid 9 erroneous erasure prevention detection hole 10 erroneous erasure prevention operation window 11 prism 12 support member 13 support recess 15 refraction surface 17 light emitting element 18 Light receiving element 20 Prism 21 Support member 24a, 24b Refractive surface 25 Detection hole 26 Prism 30a, 30b Refractive surface

Claims (5)

[Claims] 1. A sliding operation of an erroneous erasure prevention plug allows the plug to open and close a detection hole to switch between a record erasable state and an erroneous erasure preventive state. In a recording medium storage cassette equipped with an erroneous erasure prevention plug that allows the erroneous erasure prevention operation window to come in and out, using the detection hole and / or the erroneous erasure prevention operation window,
The light from the light emitting element is refracted and emitted from the light guide body stored in the recording medium storage cassette, and is received by the light receiving element,
A recording medium accommodating cassette characterized by being capable of detecting an erroneous erasure prevention state or an erasable state. 2. The recording medium storage cassette according to claim 1, wherein the incident light and the emitted light form an optical path orthogonal to each other. 3. The recording medium storage cassette according to claim 1, wherein the emitted light forms an optical path that refracts the light guide body and returns to the incident light side. 4. The recording medium accommodating cassette according to claim 3, wherein the incident light and the emitted light form an optical path that enters from the side of the cassette and exits from the same side. 5. The recording medium accommodating cassette according to claim 3, wherein the incident light and the emitted light form an optical path that is incident from the lower side of the cassette and is emitted from the same lower side.