JPH03214484A - Tape cassette - Google Patents

Abstract

PURPOSE:To prevent an electromagnetic wave from invading by setting the length of two planes of a shutter extending in the insertion direction of a mag netic head larger than at least the length from the confronting plane of a shutter with the magnetic head to a shield plate at the depth part of a magnetic head insertion window. CONSTITUTION:The shield plate 6 whose material consists of an iron plate or a stainless steel plate is housed in the depth part 3a of the magnetic head insertion window in a cabinet 1, and the shutter 7 consists of a shield plate with U-shape cross-section. The length C, D of the two planes 7a, 7b of the shutter 7 extending in the magnetic head insertion direction are arranged so as to exceed at least the length E to the shield plate 6 at the depth part 3a of the cabinet 1. In such a way, it follows that the front plane, the upper plane, the lower plane, and the side plane of the magnetic head 10 can be enclosed with a shield member consisting of the shield plate 6, the two planes 7a, 7b of the shutter 7, and the confronting plane 7c with with the magnetic head. Since such constitution is employed, it is possible to prevent the electromagnetic wave invaliding from the mechanism of the magnetic head or the outside, and to perform recording and reproduction satisfactorily.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to a tape cassette that stores a tape-shaped recording medium (hereinafter referred to as "tape") on which information such as music and images can be recorded and reproduced. .

Conventional technology Conventionally, for example, in the compact cassette tape shown in FIG. 7, a shield plate 6 is provided in front of the magnetic head 10 inserted into the insertion window of the housing 1 to prevent electromagnetic waves from entering the magnetic head 10 from the mechanism and the outside. It serves as an electromagnetic shield.

Problems to be Solved by the Invention However, the shielding structure of conventional compact cassette tapes has the problem that it is almost impossible to prevent electromagnetic waves from the top, bottom, and sides of the magnetic head. In order to reduce electromagnetic waves from the mechanism as much as possible, methods such as providing a separate means for preventing radio waves inside the mechanism have been taken.

The present invention solves these conventional problems, and its technical object is to provide a tape cassette with a simple configuration and an electromagnetic shielding effect.

Means for Solving the Problems In order to solve the above-mentioned problems, the tape cassette of the present invention includes a housing housing a tape, a shield plate housed in the back of the magnetic head insertion window of the housing, and a U-shaped shield. It consists of a sliding shutter that opens and closes the window of the housing made of wood,
The length of the two surfaces of the shutter extending in the magnetic head insertion direction is configured to exceed at least the length from the magnetic head facing surface of the shutter to the shield plate.

Effect: With the above configuration, the front, top, bottom, and side surfaces of the magnetic head inserted into the housing are surrounded by shielding material.

EXAMPLE A first example of the tape cassette of the present invention will be described below with reference to the drawings.

Fig. 1 is a perspective view of a tape cassette in an embodiment of the present invention, Fig. 2 is a plan view of the tape cassette of Fig. 1 seen from above, and Fig. 3 is a plan view of the tape cassette of Fig. 1 seen from below. 4 is a perspective view of the shutter of this tape cassette seen from below, FIG. 5 is a sectional view of the tape cassette of FIG. 2 seen from the direction of arrow A, and FIG. 6 is a tape of the present invention. FIG. 3 is a plan view illustrating the operation when the force set is attached to the magnetic recording/reproducing device.

In FIGS. 1, 2, 3, and 4, a housing 1 housing a tape 2 houses a shield plate 6 made of iron or stainless steel in the inner part 3a of the magnetic head insertion window 3. . The shutter 7 has a U-shape and is made of a shield material (iron plate or stainless steel plate), and connects the magnetic head insertion window 3 and pinch roller insertion windows 4a, 4b of the housing l to the reel insertion hole 5a. It can be opened and closed in the direction connecting the centers of 5b (in the direction of arrow B in Figure 1). The guides 8a and 8b provided on the shutter 7 are the guide grooves 9a and 8b provided on the housing 1, respectively.
9b and is slidable.

To further explain with reference to a cross-sectional view of the fifth tooth, two teeth 7a. 7b lengthC. D is arranged so that it exceeds at least the length E of the back part 3a of the head insertion window 3 of the housing 1 to the shield plate 6.

Regarding the tape cassette configured as above, the sixth
This will be explained in more detail using figures.

In the tape cassette of this embodiment, the shutter 7 has a guide groove 9a.
, 9b to the open position where the magnetic head insertion window 3 and the pinch roller insertion window 4a+4b are completely exposed, and the magnetic head 10 is inserted into the magnetic head insertion window 3 of the housing l. and levers 12a., which are rotatable around shafts 11a and flb. Shafts 13a, 13 at the tip of 12b
Of the pinch rollers 14a and 14b whose rotational axis is b, FIG. 6 shows the pinch roller 14a inserted into the pinch roller insertion window 4a of the housing 1.

At this time, the front, top, bottom, and side surfaces of the magnetic head 10 inserted into the housing 1 are covered with a shield material consisting of the shield plate 6, two surfaces 7a + 7b of the shirt shutter 7 extending in the magnetic head insertion direction, and the magnetic head facing surface 7c. It will be surrounded by

Effects of the Invention As described above, according to the tape cassette of the present invention, the front surface of the magnetic head is covered with a shield plate made of an iron plate or a stainless steel plate, and the top, bottom, and side surfaces of the magnetic head are made of an iron plate or a stainless steel plate. Since the magnetic head is surrounded by a shutter with a rolled effect made of an iron plate or a stainless steel plate, it is possible to prevent electromagnetic waves from entering the magnetic head from the mechanism or from the outside, resulting in good recording and reproduction.

[Brief explanation of drawings]

1 is a perspective view of the tape cassette of the present invention viewed from above, FIG. 2 is a plan view of the tape cassette of FIG. 1 viewed from above, and FIG. 3 is a perspective view of the tape cassette of FIG. 1 viewed from below. 4 is a perspective view of the shutter of the tape cassette seen from below, FIG. 5 is a sectional view of the tape cassette of FIG. 2 seen from the direction of arrow A, and FIG. 6 is a tape of the present invention. Plan view when the cassette is installed in the magnetic recording/reproducing device, No. 7
The figure is a plan view showing a conventional tape cassette. DESCRIPTION OF SYMBOLS 1... Housing, 2... Tape, 3... Magnetic head insertion window, 8a, 8b... Guide, 9a
．． 9b... Guide groove, 10... Magnetic head.

Claims (1)

[Scope of Claims] A housing that houses a tape-shaped recording medium and has a plurality of windows on the front face, a shield plate that is housed in the back of the window into which a magnetic head of the housing is inserted, and has a U-shaped cross section. and a slidable shutter that opens and closes the window of the housing from a shielding material, and the length of two surfaces of the shutter extending in the magnetic head insertion direction is at least from the magnetic head facing surface of the shutter to the magnetic head insertion window. A tape cassette characterized by a length that exceeds the length to the shield plate at the back.