JPS5816192Y2 - Mounting structure of magnetically sensitive element - Google Patents

Description

[Detailed explanation of the idea] This idea can be applied to, for example, Hall elements and Hall ICs.

Or related to the mounting structure of magnetically sensitive elements such as magnet diodes, ensuring the accuracy of the mounting dimensions and mounting strength.
The purpose is to make it easy to maintain.

Recently, magnetically sensitive elements such as Hall elements, Hall ICs, and magnet diodes have come into widespread use.For example, they are used in circuits that automatically stop a cassette tape recorder when the tape reaches its end. It is often used as a rotation detection device.

These magnetically sensitive elements must be installed in such a way that their relative position with respect to the magnet wheel rotated by the reel disk of the cassette tape recorder remains unchanged, and that they will not be distorted by vibrations or shocks.

As is known, most of these magnetically sensitive elements have lead wires protruding from the element body, and even if they are inserted into a printed circuit board and soldered, the mounting dimensions must be maintained accurately. Since this is difficult, conventionally various mounting members have been used in combination to maintain the above-mentioned mounting dimensional accuracy and mounting strength.

However, the combined use of other mounting members in this way has various disadvantages, such as the space required for mounting is limited, the cost of parts increases, and the number of man-hours required for mounting.

This invention is intended to eliminate the drawbacks of the conventional method in which a magnetically sensitive element is mounted using a separate mounting member as described above, and will be described below with reference to the embodiments shown in the drawings.

The figure shows an example of a mounting structure for a magnetically sensitive element used as a rotation detection device for causing the above-mentioned automatic stop of a cassette tape recorder.
FIG. 2 is a side view thereof.

In these figures, 1 is a printed circuit board, a part of which is provided with a through hole 2, and a magnet wheel 3 is rotatably attached through this through hole 2.

4 is a Hall IC, that is, a magnetically sensitive element, and 5 is a capacitor such as an electrolytic capacitor.

The magnetically sensitive element 4 is attached to the outside of the rotation locus of the magnet wheel 3 in close proximity to the button, and a capacitor 5 is attached adjacent to the back of the button.

The mounting accuracy of this magnetically sensitive element 4 to the magnet wheel 3 may be approximately ±0.5 mm, and this value is
This is sufficiently achievable even when taking into account the accuracy of drilling into the hole, the dimensional accuracy of the magnetically sensitive element 4, and the capacitor 50.

The two lead wires 5' of the capacitor 5 are arranged so as to be aligned in the direction A shown in FIG. 1 for a stable and strong installation.

The magnetically sensitive element 4 is in contact with the back surface of the capacitor 5, and this contacting portion is fixed and fixed integrally with an adhesive or the like.

In this way, by integrally fixing the magnetically sensitive element 4 to the adjacent capacitor 5, the mounting strength of the magnetically sensitive element 4 is sufficiently increased, and the magnetically sensitive element 4 can be attached to the printed circuit board.
Better positional accuracy can be maintained compared to the case where the magnet wheel is inserted and soldered. a capacitor mounted on the printed circuit board adjacent to the magnet wheel; and a capacitor bonded to the side surface of the capacitor with an adhesive to face the magnet wheel and fixed integrally with the capacitor on the printed circuit board. By adopting a mounting structure for a magnetically sensitive element consisting of a magnetically sensitive element, all of the drawbacks of using a conventional separate mounting member, such as increased cost, increased installation man-hours, and increased installation space, are eliminated. This means that by placing the capacitor adjacent to the magnetically sensitive element and fixing them together, the mounting strength of the magnetically sensitive element can be sufficiently increased, and the accuracy of the mounting dimensions can also be stabilized without fluctuations. In addition, since the number of parts is reduced by using the adjacent capacitor and no separate mounting material is used, there is no increase in cost, and the number of installation steps is reduced to simply bonding the capacitor and the magnetically sensitive element. Moreover, it has the advantage that the mounting space on the printed circuit board can be reduced by not using a separate mounting member and by mounting the capacitor and the magnetically sensitive element closely together.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the magnetically sensitive element mounting structure according to this invention, and FIG. 2 is a side view thereof. DESCRIPTION OF SYMBOLS 1... Printed circuit board, 2... Through hole, 3... Magnet wheel, 4... Magnetically sensitive element, 5... Capacitor,
5'...Capacitor lead wire.

Claims (1)

[Scope of utility model registration request] A magnet wheel, a printed circuit board disposed in a predetermined positional relationship with respect to the magnet wheel, a capacitor mounted on the printed circuit board adjacent to the magnet wheel, and a capacitor bonded to the side surface of the capacitor with an adhesive. A mounting structure for a magnetically sensitive element comprising a magnetically sensitive element integrally fixed with the capacitor on the printed circuit board so as to face the magnet wheel.