JPH0132180Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a cassette tape recorder having a front/back detection device for detecting a detection member for front/back identification provided on a cassette half constituting a housing of a cassette tape.

In order to improve the operability of the cassette tape recorder, it is possible to detect and display the front and back sides (A side, B side, 1st side, 2nd side) of the cassette tape loaded in the tape deck, and to automatically control the operation of the tape drive system. Attempts are being made to switch.

Therefore, detecting members such as recesses and magnetized plates that are provided only on one side of the cassette half and not on the other side are detected by a front/back detection device installed in a part of the chassis to detect the front and back sides. A method for determining this has been proposed.

However, in such a front/back detection device,
Detection was impossible unless the cassette tape was completely attached to the cassette tape recorder.

In addition, in a cassette tape recorder in which a cassette tape is inserted in advance into a cassette holder which also serves as a lid of a cassette loading section so that the cassette tape can be easily installed, if the cassette holder is provided with a front/back detection device, the cassette tape can be rotated. It is possible to detect the front and back sides of the tape before it is completely installed, but the positional relationship between the cassette holder, which is the cassette tape installation part, and the cassette tape is different when the cassette tape is inserted into the holder and when it is installed on the operating surface of the tape deck. Because of the slight difference, the detection accuracy was poor, and there was a risk of erroneously detecting the front and back sides at times.

This idea was made in view of the above points,
Even if the relative positional relationship between the cassette tape loading section and the loaded cassette tape changes slightly, the relative positional relationship between the detected surface of the cassette tape and the detection device is always kept constant, achieving high accuracy. The purpose is to enable detection of front and back sides.

Therefore, in the cassette tape recorder according to the present invention, a detection device for detecting the detected member provided on the cassette half is attached to the cassette tape mounting section, and the detection device is attached to the cassette tape mounting section so that the detecting device detects the detected member provided on the cassette half, and the detecting device is attached to the cassette tape mounting section so as to be placed in contact with the detected surface of the cassette tape mounted on the mounting section. The above object is achieved by attaching it to a movable member that is urged into contact with the movable member.

Embodiments of this invention will be described below with reference to the accompanying drawings.

Figure 1 shows the first embodiment of this invention.
The lower edge of the rotary cassette holder 1, which constitutes a cassette tape mounting part consisting of a lid part 1a and a detection member mounting part 1b, is pivotally connected to the main body of a cassette tape deck (not shown) by a shaft 2, and the detection member mounting part 1b is Spring 3
A movable member 4 is attached via a and 3b, two rollers 5a and 5b are rotatably provided on the movable member 4, and the roller 5a is attached to the detection surface 10a of the cassette tape 10 mounted on the cassette holder. ,5b
It is biased by springs 3a and 3b so that they come into contact with each other.

A detection device 6 is attached between rollers 5a and 5b of this movable member 4.

On the other hand, a detection member 11 for identifying the front and back is provided on either the front or back of the cassette tape 10 to be detected, and when the cassette tape 10 is inserted into the cassette holder 1, the detection device 6 maintains a slight gap and detects the detected member. It is now facing 11.

Here, as the member to be detected 11, for example, a magnetized plate, a magnet, a light reflection plate, etc. can be considered, and as the detection device 6 corresponding to these, a magnetic sensor, a Hall element, a photoelectric sensor, etc. are used.

With the above configuration, when the cassette tape 10 is inserted into the cassette holder 1, the cassette tape 10 is pressed against the back surface 1c of the lid part 1a via the rollers 5a, 5b provided on the movable member 4 by the force of the springs 3a, 3b. Fixed.

When the cassette holder 1 is rotated from this state and the cassette tape 10 is attached to the performance surface of the tape deck body, the cassette tape 10 is completely attached to the back surface 1c of the cassette holder lid 1a.
The position of the cassette tape 10 is determined by being pressed by springs 3a and 3b against a reference pin (not shown) that is provided on the performance surface and slightly separated from the cassette tape 10.

During this time, the gap between the detection device 6 and the member to be detected 11 is always kept constant, and erroneous detection due to fluctuations in the relative position between the cassette tape 10 and the cassette holder 1 is prevented.

Next, FIG. 2 shows a second embodiment of this invention, which is a partial modification of the first embodiment, and when the cassette tape is inserted in the first embodiment, the movable member 4 moves as shown in the figure. This is an improvement in that it is easily displaced in the vertical direction.

Lever-shaped movable member 14 in this embodiment
The cassette tape 10 is equipped with a roller 5 whose one end is pivotally connected to the detection member attachment part 1b of the cassette holder 1 by a shaft 17, and which is rotatably provided by a spring 3 to give it a left-handed rotation as shown in the figure. The detection target surface 10a is brought into contact with the detection target surface 10a.

Therefore, the positional relationship between the detection device 6 attached to the movable member 14 and the detected member 11 provided on the detected surface 10a is always constant both in the horizontal and vertical directions in the figure, and the detection accuracy is When can you improve so.

FIG. 3 shows a third embodiment of this invention in which a cassette tape 10 has recesses 10c as members to be detected on both sides. The movable member 14 is provided with a protruding roller 5 that can be fitted into the recess 10c, a spring 3 imparts left-handed rotation behavior as shown in the figure, and a normally open leaf switch 16 is attached to the movable member 14 as a detection device.

Therefore, the detection surface 10a with the recess 10c
When facing the leaf switch 16, the roller 5
fits into the recess 10c, the movable member 14 rotates to the left as shown in the figure, and the protrusion 16 of the leaf switch 16
a is pushed by the detection surface 10a, and the movable contact piece 16b
contacts the fixed contact piece 16c and the switch is closed.

On the other hand, when the detection surface 10b without the recess 10c faces the roller 5, the movable member 14 is rotated to the right against the spring 3, and the leaf switch 16 is opened.

Depending on the closed or open state of the leaf switch 16, it is possible to detect the front and back sides of the loaded cassette tape.

This recessed part 10c as a member to be detected is because most of the cassette tapes of the Philips standard have a hole in only one cassette half for embedding the head of the screw for tightening the cassette half.
You can take advantage of it.

Note that even if the detected member provided on the cassette tape 10 is a convex portion, it can be detected in the same manner, and in the case of a conductive plate, a conductive pin may be used as the detection device.

According to each of the above embodiments, since the portion of the movable member that contacts the detection surface is a rotatable roller, there is no problem when inserting the cassette tape 10 into the cassette holder 1. This roller may be a rotating body such as a disc, a cylinder, or a sphere.

As described above, according to this invention, the relative position between the detection device and the surface to be detected is always kept constant regardless of the displacement of the cassette tape, so that the detection device provided on the surface of the cassette half can be Minute members and steps can be detected extremely accurately, and if this detection device is attached to a cassette holder, it has the excellent effect of making it possible to identify the front and back sides of a cassette in the early stage of insertion into the cassette holder.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a cassette holder showing a first embodiment of this invention, and FIG. 2 is a second embodiment of this invention.
FIG. 3 is a side sectional view of a cassette holder showing a third embodiment of this invention. 1...Cassette holder, 3...Spring, 4, 14
...Movable member, 5...Roller (rotating body), 6...
Detection device, 10...Cassette tape, 11...Member to be detected, 16...Leaf switch (detection device).

Claims (1)

[Claims for Utility Model Registration] 1. In a cassette tape recorder having a detection device for detecting a detected member provided on a cassette half in order to identify the front and back sides of a cassette tape, the detection device is attached to a cassette tape mounting section. and is mounted on a movable member that is urged to come into contact with the detection surface of the cassette tape mounted on the mounting section, and the relative positional relationship between the detection surface and the detection device is always maintained constant. A cassette tape recorder characterized by: 2. The cassette tape recorder according to claim 1, wherein the portion of the movable member that contacts the detection surface is a rotating body such as a rotatable disk, cylinder, or sphere.