JPS6331270Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape cassette used in video, audio, data recorders, etc.

Conventionally, in this type of tape cassette, for example, a tape cassette used in an audio tape recorder, the recorder has been designed to optimize the recording current etc. according to the type of tape, such as metal, CrO ₂ or γ-Fe ₂ O ₃ tape. A changeover switch was provided on the main body, and the user could judge the type of tape and change it. In addition to the complexity of switching operations each time, these have the disadvantage that sufficient performance cannot be obtained if the switching operation is incorrect. On the other hand, in order to automatically detect the type of tape, the tape length convenient for calculating and displaying the remaining amount of tape, and the tape thickness to change the tape running tension value as necessary, the tape cassette It has been considered to provide the sensor itself with a detectable signal shape, such as a hole.

In addition to the contact detection means in which the detection part directly contacts the signal shape part, the present invention detects the signal of the signal shape part based on the presence or absence of light transmission in the thickness direction of the tape cassette. It is an object of the present invention to be able to apply a detection means of a light transmission detection method, to prevent erroneous detection, and to realize these with an extremely simple and inexpensive structure without impairing the appearance of the tape cassette.

Hereinafter, one embodiment of the tape cassette according to the present invention will be described in detail with reference to the drawings. 1 and 2 are perspective views of the tape cassette according to the present invention, viewed from the top or bottom, respectively.

On the upper surface 1A of the rear end of the tape cassette 1,
Holes 2A and 3 are signal shaped portions indicating the specifications of the tape (not shown) wound inside the tape cassette 1.
A, 4A, 5A, 6A, and 7A are provided, and the lower surface 1 of the rear end of the tape cassette 1 faces each other.
B is provided with holes 2B, 4B, 5B, and 6B. As shown in FIG. 1, holes 2A, 3A, 4A, and
5A, 6A, and 7A are all open, but as shown in FIG. The holes are not provided at the positions and are closed, and the positions of the lower surface 1B corresponding to the other holes 2A, 4A, 5A, and 6A are open like the upper surface 1A.
Holes 2A, 3A, 4A, 5A, 6A, 7 on top surface 1A
A or the holes 2B, 4B, 5B, and 6B on the bottom surface are used as bit information, and for example, it is detected and judged whether or not the bottom surface corresponding to the hole on the top surface is in a closed state, and one or more bits are arbitrarily set according to the tape specifications. The specifications of the tape (not shown) are detected by combining the holes.

FIG. 3 is a partial cross-sectional view of the holes 2B and 4B formed in the lower surface 1B as viewed from the direction of the upper surface 1A, and FIG. FIG. 3 is a schematic cross-sectional view for detection.

In FIGS. 3 and 4, the lower surface 1B faces each of the holes 2A, 3A, and 4A formed in the upper surface 1A.
Holes 2B and 4B are formed in the upper surface 1A and are open, but a position 3B on the lower surface 1B opposite to the hole 3A formed on the upper surface 1A is closed. A lower surface 1B facing each of the holes 2A, 3A, and 4A formed in the upper surface 1A.
A space connecting the holes 2B and 4B provided in the tape cassette 1 is surrounded by the optical path wall 8 and the side plate 1' in the thickness direction of the tape cassette 1. Light emitters 10 and 11 are provided below each of the holes 2B formed in the lower surface 1B of the tape cassette 1 and the positions 3B on the lower surface 1B corresponding to the holes 3A formed in the upper surface 1A. Photoreceptors 12 and 13 are provided opposite light emitters 10 and 11 with tape cassette 1 interposed therebetween. The light emitted from the light emitter 10 passes through the holes 2B and 2A and reaches the light receiver 12.
The light emitted from the photoreceptor 11 is blocked by the lower surface 1B, and the light is not received by the photoreceptor 13. This makes it possible to detect the specifications of the tape. At this time, each optical path is separated by an optical path wall 8 so that the photoreceptor 13 does not receive light from a source other than the light emitter 11 which is opposed to it via the tape cassette 1, thereby preventing erroneous detection. Furthermore, since the holes 2A, 3A, 4A, 5A, 6A, and 7A on the top surface 1A of the tape cassette 1 are all open in a well-balanced manner, there is no hole in the top surface 1A according to the tape specifications. Detection using a light transmission method is now possible without damaging the appearance.

Next, as a means for detecting the specifications of the tape of the tape cassette of the present invention, a contact type detecting means in which the detecting section directly contacts the shape signal section will be described with reference to FIG. Of the switches 14 and 15 provided at predetermined distance positions corresponding to the hole 2B provided on the bottom surface 1B of the tape cassette 1 and the position 3B corresponding to the hole 3A provided on the top surface 1A, The detection pin of the switch 14 enters the hole 2B,
The switch 14 is not operated, but the switch 15 has its position 3B, which corresponds to the hole 3A, closed.
Since the detection pin of the switch 15 comes into contact with the lower surface 1B and is moved, the switch 15 is operated, and the specification of the tape (not shown) can be detected by the combination of opening and closing of the hole.

In the above embodiment, the optical path for light detection was formed by the optical path wall 8 and the side plate 1' of the tape cassette 1, but as shown in FIG. Alternatively, an optical path may be formed. By keeping the size of the optical path formed by the optical path wall 9 constant, it is possible to insert a separate member (not shown) into the optical path wall 9 of the open hole when changing the specifications of the tape. This makes it easy to put the device in a closed state.

As is clear from the above description, the tape cassette of the present invention includes a casing for storing a tape, a first signal shape portion having at least one hole on a first surface forming the casing, and a first a second signal shape portion formed by opening or closing a hole opposite to the hole of the first signal shape portion on a second surface opposite to the surface;
It consists of a wall that makes the space connecting the hole of the second signal shape part opposite to the hole of the first signal shape part optically independent from other spaces, and the light It is possible to detect the specifications of the built-in tape by switching between the transmission type and contact type detection means with an extremely simple structure, and also prevents false detection in the light transmission type.

[Brief explanation of the drawing]

Fig. 1 is a perspective view from above of an embodiment of the tape cassette according to the present invention, Fig. 2 is a perspective view from the bottom of the tape cassette, Fig. 3 is a partial sectional view of the tape cassette, Figs. FIG. 5 is a schematic sectional view showing a detection means for detecting a shape signal of the tape cassette, and FIG. 6 is a partial sectional view showing another embodiment of the tape cassette according to the present invention. 1...Tape cassette, 1A...Top surface, 1B...
...Bottom surface, 2A, 2B, 3A, 4A, 4B, 5A,
5B, 6A, 6B...hole, 8, 9...light path wall.

Claims (1)

[Claims for Utility Model Registration] (1) A housing rotatably housing a pair of reels wound with magnetic tape, and at least one hole provided in a first surface forming the housing. a first signal-shaped portion formed on a second surface opposite to the first surface, and a second hole formed in a position opposite to the hole of the first signal-shaped portion opened or closed. A tape cassette comprising a wall that makes a space connecting a signal shape section and a hole in the second signal shape section opposite to a hole in the first signal shape section optically independent from other spaces. (2) The tape cassette according to claim 1, wherein the first signal shape section is provided on the top surface of the casing, and the second signal shape section is provided on the bottom surface of the casing.