JPH02263345A - Detecting device for a/b side of compact cassette tape - Google Patents

Abstract

PURPOSE:To obtain a surface information signal which can automatically identify a cassette state by adding a push switch to the cassette device to detect the recess of a screw attachment part of a cassette half when a tape cassette is lapsed to the cassette device. CONSTITUTION:The structural difference between both surfaces of a cassette half is defined in the following two points in order to identify the A and B sides of a tape. At the first point, an attachment screw a-2 for a cassette half a-1 is fixed at a constant position through the side A. This fixed part a-3 including the center part of a screw head is hollowed compared with the surface of the cassette half while the side B is flat. At the second point, the screw a-2 is made of a metal and other peripheral parts of the cassette half are made of a nonmetallic material. Then the screw is inserted through the side A. A device is added to a cassette device to detect the difference between said two points. Thus both sides of a cassette can be automatically identified.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention is a device built into a compact cassette tape recording/playback machine or related equipment, which is capable of preventing A
The present invention relates to a device that determines (detects) the direction of the (1) plane and the B (2) plane.

``Conventional technology'' Conventional compact cassettes, like micro cassettes and L cassettes, are capable of double-sided recording and playback, but unlike these other cassettes, clear A and B side identification areas are provided on the cassette half. Because the equipment was not installed properly, the equipment was not supported.

``Problem to be solved by the invention'' When operating cassette decks, etc., there was a high possibility of erroneous operation because managing the tape surface depended on the presence of people. Especially recently, many auto-reverse decks have become available, and tape surface management has become even more important with this type of tape.

Furthermore, if these devices are equipped with a device that detects tape surface information, the functionality can be further increased.

Although it is possible to add tape surface information to the tape itself by some method, this requires tape processing, and furthermore, this may cause the tape to be out of specification.

The problem that this invention attempts to solve is clearly A.
The problem is how to automatically obtain a side information signal that can be identified by a cassette device from a compact cassette tape that is not provided with a side B identification section, without modifying the tape.

"Means for Solving the Problem" In order to identify the A and B sides of the tape, the structural differences between the sides of each cassette half were determined based on the following two points.

The first point is that the cassette half mounting screw is in a fixed position A.
It is screwed from the surface, and this part, including the center part of the screw head, is recessed from the half surface, but the B surface is flat.

The second point is that although this mounting screw is made of metal, the other half parts around it are made of non-metal and assembled, and the screws are inserted from side A.

Automatic identification of the cassette surface becomes possible by attaching a device to the device to detect the difference in either of the above two points.

The specific methods for detecting these two differences are described in Example 1. This is described in Example 2.

``Operation'' When a cassette tape is loaded into the device, the electric (electronic) switch turns on and off depending on the A and B sides.

"Example" Example 1 FIG. 1 is a plan view showing the first embodiment.

In the first embodiment, push switch 1 is used to check whether part a-3 of the cassette half mounting screw is recessed or not. (In this case, the detection rod 1-1. and the leaf switch l-2
, and the like).

This push switch 1. Tape deck (equipment)
If you place the tape in a position where it will come into contact with the mounting screw when the tape is attached to the switch, the surface of the tape will have unevenness, so this switch will be pressed or not pressed, and it will be converted into an on/off electrical signal. This allows devices to identify each other based on this signal. (Specifications as claimed) Embodiment 2 FIGS. 2 and 3 are diagrams showing Embodiment 2.

In Example 2, the cassette half mounting screw a-
Noting that 2. is made of metal and other local parts are made of non-metal, metal screw a-2 is attached to detection coil 2. The A and B planes are detected based on the difference in the magnitude of the change in the inductance of this coil that occurs when the coil is brought close to the coil.

For part a-3° of the cassette half installation screw, when comparing sides A and B, the head of the screw is larger on side A, so as shown in Figure 3, tape deck (machine nb, >
If the detection coil 26 is fixed to the part of the side where this screw hits, then when the tape is attached and the two sides are brought close to each other, the degree of influence on the detection coil will be different, and if the degree of this change is detected and processed. It is possible to obtain surface information signals that can be identified by devices.

Next, a circuit for detection processing will be explained using a block diagram shown in FIG.

The basic configuration of the circuit is a detection coil 20, an oscillation section 30, a rectification section 40, a voltage switch section 5. The two-circuit operation consists of a detection coil 2. As part of the tank circuit for oscillation, the oscillating section 3° is operated to oscillate. This oscillation wave is transmitted to the next rectifying section 4. The voltage is converted into a DC voltage proportional to the magnitude of oscillation and drives the voltage switch 5 at the next stage. This voltage switch section is configured to perform an opening/closing operation (turn on) when a voltage of a certain level or higher is input to generate a surface information signal. Through this series of operations, the first stage oscillator 3
．． If the oscillation is sufficient, the switch at the final stage is turned on. Now detection coil 2. When the screw part a-3 of the tape A side is brought close to the switch part 5. is off. When the B side is brought closer, the detection coil 2. The effect on switch section 5. is small and has almost no effect on oscillation. is turned on. This allows it to be converted into an on/off electrical signal. (Specification of claim 2 [Effect of the invention J) By adding this device to a cassette device, the device can obtain tape surface information even with existing tapes without any modification or special operation. Based on this information, devices can send messages to the operator, perform various automatic controls, and increase functionality.

Furthermore, since there are five screws for attaching the half of the cassette tape, which are the detection positions of the device of the present invention, on the half, the detection part may be provided at one of the positions deemed appropriate according to the mechanism of the cassette device.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the first embodiment. FIG. 2 is a block diagram showing a second embodiment. FIG. 3 is a plan view showing the second embodiment. 1. Push switch 1-1.・・・・・−・・・−・−・・・・・・・Detection rod 1-2. Leaf switch・−・−・−・・−・・・・・−・・・・・・−Detection coil・・・・・・・−−−・・−・・・−・Oscillating part・
・・・・・・・・・−・−・・−・・−・・Rectifier section voltage switch section drawing a-1. a-2. a -3゜・・・－・・・・・・－・・・Cassette half...
・－・－・・－Cassette half installation screw Recess in cassette half installation screw.・・・・・−・−・・・・・・・Equipment Fig. 2A. B.・・・・・・－・・・－・・・－Cassette tape A side direction Cassette tape B side direction

Claims (1)

[Claims] 1. Cassette tape in equipment b. When the cassette half a-1. The dent in the screw attachment part a-3. Push switch to detect 1. equipment b. A device for detecting A and B sides of a compact cassette tape. 2. Put the cassette tape into the device b. When the cassette half is installed in the cassette half mounting screw a-2. Detection coil whose characteristics change sufficiently depending on the orientation of the coil 2. equipment b. This detection coil 2. A compact cassette tape side A and B side detection device characterized by circuit processing that converts changes in characteristics into switch operations.