JPS585930Y2 - magnetic lens support device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a magnetic lens support device for use in a device that holds a magnetic sensing element such as a Hall element between magnetic lenses and provides direction indication.

Two magneto-sensitive elements with magnetic lenses placed on both sides are placed orthogonally, and by rotating the paper 360 degrees, each generates a sine wave of one wavelength. From this sine wave, determine which direction is north. A direction indicator that indicates the direction in which a vehicle is moving or in which direction it is traveling has been developed and filed by the same applicant.

By the way, it is necessary to reduce the gap between the magneto-sensitive element and the magnetic lens because the generated voltage can be increased, but if the gap is small and they are brought into close contact with each other, the magnetic lens will not be sensitive when it expands due to outside temperature. May destroy magnetic elements.

Therefore, it is possible to prevent the destruction of the magneto-sensitive element by using a material with the same coefficient of thermal expansion as the magnetic lens for the non-magnetic case to which the magnetic lens is attached. b: It is difficult to select the same one, and if the magnetic sensing element itself expands, it is impossible to prevent the element from being destroyed.

Therefore, this idea prevents excessive stress from being applied to the magnetic sensing element, keeps the magnetic lens in pressure contact with the magnetic sensing element at all times, and also serves as a cushion against movement of the magnetic lens due to vibration. The purpose of the present invention is to provide a magnetic lens support device that provides improved magnetic lens support.

Next, one embodiment of this invention will be described with reference to the drawings.

1 is a mounting plate made of a non-magnetic material, 2 and 2' are magnetic lenses made of ferromagnetic material in which a magnetic flux convergence part 21 and 21' with one end as a truncated cone are formed, and a circle closer to the convergence part 21 than the middle is formed. Rings 22, 22' are formed in the circumferential direction.

Reference numeral 3 denotes a magnetic sensing element such as a Hall element, which is held between the tips of the magnetic flux converging parts 21 and 21' of the magnetic lenses 2 and 2' facing each other.

Lead wires 31 of the magnetic sensing element 3 are soldered to a printed board 4 fitted in a case 5, which will be described later.

A case 5 is made of a non-magnetic material and has an open top surface, and partition plates 51 and 52 are formed to divide the chamber into three chambers, and the printed board 4 described above is fitted and fixed in the middle chamber. A fitting protrusion 53 is formed for this purpose.

And the annulus 22, 22 of the above-mentioned magnetic lenses 2, 2'
' is located approximately at the center of the chambers on both sides of the case 5, and ring-shaped cushioning materials 6, 6' made of rubber or the like are provided on both sides of each ring 22, 22' in the chamber.

I, 7' are inserted.

In this way, inside the case 5 are the magnetic lenses 2, 2', the magnetic sensing element 3, the printed board 4, and the cushioning materials 6, 6', 7.
7' is housed, and the open side is attached to the mounting plate 1 with adhesive or the like.

Furthermore, on the lower surface of the mounting plate 1, parts having the same structure as those described above are mounted in a state that they are perpendicular to each other.

To explain the function based on the above structure, the cushioning materials 6.6' and 7.7 are designed so that the magnetic lenses 2 and 2' clamp the magnetic sensing element 3 with an appropriate force under the thermal expansion coefficient state under normal temperature.
' If there is a temperature rise, the magnetic lens 2,
Even if 2' expands, the cushioning materials 6.6' and 7.7' absorb the expansion, and even if they shrink due to temperature drop, the cushioning materials 6, 6', ? .

7' clamps the magnetic sensing element 3 with an appropriate force.

Furthermore, when the G of the vibration is lost as shown by the arrow, the return force of the cushioning material 6' and the force of the G of the vibration act in a direction that cancels each other out, and in the magnetic lens 2', they act in a direction in which they add up. Since an excessive stress is applied to the magnet, a cushion material I is provided to absorb the stress, thereby preventing the magneto-sensitive element 3 from being destroyed due to vibration.

Although rubber is used as the cushioning material in the above embodiments, other elastic materials such as springs may be used instead.

As mentioned above, this idea supports the magnetic lens inside the case with cushioning material and clamps the magnetic sensing element with moderate force, so even if the magnetic lens expands or contracts due to temperature changes, the magnetic sensing element will always remain in place. It is held with an appropriate force, and even if vibrations are applied, the cushioning material absorbs the vibrations and has the effect that the magnetic sensing element will not be destroyed.

[Brief explanation of the drawing]

The figures show an embodiment of the magnetic lens support device according to this invention, with FIG. 1 being a front view and FIG. 2 being a plan view taken along line 1--n of the same. 2.2'... Magnetic lens, 3... Magnetically sensitive element, 5... Case, 6, 6', 7.7'...
...Cushion material.

Claims (1)

[Scope of utility model registration request] Two magnetic lenses are arranged in a case made of non-magnetic material with magnetic flux converging parts facing each other, and a magnetic sensing element is sandwiched between the opposing surfaces, and the magnetic lenses are fixed in the case via a cushioning material such as rubber. A magnetic lens support device characterized by: