JPH03117763U

JPH03117763U -

Info

Publication number: JPH03117763U
Application number: JP2700190U
Authority: JP
Priority date: 1990-03-16
Filing date: 1990-03-16
Publication date: 1991-12-05
Anticipated expiration: 2005-03-16
Also published as: JPH0754861Y2

Description

[Brief explanation of drawings]

第１図は本考案の第１の実施例に係わる速度セ
ンサを示す中央縦断面図、第２図は第１図の速度
センサの平面図、第３図は第１図の速度センサの
ボビンを示す正面図、第４図及び第５図は第２及
び第３の実施例の速度センサの中央縦断面図、第
６図は第５図の速度センサのボビンを示す正面図
、第７図、第８図、第９図、第１０図、第１１図
、第１２図及び第１３図は第４、第５、第６、第
７、第８、第９及び第１０の実施例の速度センサ
を夫々示す中央縦断面図、第１４図は永久磁石の
変形例を示す斜視図である。２……ボビン、３……コイル、４……磁気回路
形成体、５……樹脂包囲体、６……接着材、６ａ
……Ｏリング、７……中央部、８……第１の鍔部
、９……第２の鍔部、１０……孔、１１……コア
、１２……永久磁石。 FIG. 1 is a central vertical cross-sectional view showing a speed sensor according to a first embodiment of the present invention, FIG. 2 is a plan view of the speed sensor shown in FIG. 1, and FIG. 3 shows a bobbin of the speed sensor shown in FIG. 4 and 5 are central vertical sectional views of the speed sensors of the second and third embodiments, FIG. 6 is a front view showing the bobbin of the speed sensor of FIG. 5, and FIG. 8, 9, 10, 11, 12 and 13 are speed sensors of the fourth, fifth, sixth, seventh, eighth, ninth and tenth embodiments. FIG. 14 is a central vertical sectional view showing a modification of the permanent magnet. 2... Bobbin, 3... Coil, 4... Magnetic circuit forming body, 5... Resin enclosure, 6... Adhesive material, 6a
... O-ring, 7 ... Central part, 8 ... First flange, 9 ... Second flange, 10 ... Hole, 11 ... Core, 12 ... Permanent magnet.

Claims

[Claims for Utility Model Registration] (1) A utility model having a central portion 7 and first and second flange portions 8 and 9 disposed on both sides of the central portion 7, and the second flange portion 9 an insulating bobbin 2 having a hole 10 extending from the center of the first flange 8 toward the second flange 9 so as not to penetrate therethrough; The arranged magnetic circuit forming body 4, the coil 3 wound around the central part 7 of the bobbin 2, and at least the space between the first collar part 8 and the second collar part 9 are covered. However, the coil device comprises a moisture-proof coating means disposed so as not to cover the distal end surface of the magnetic circuit forming body 4 and in contact with the first flange 8 in a watertight manner. (2) The coil device according to claim 1, wherein the magnetic circuit forming body 4 comprises a magnetic core 11 and a permanent magnet 12 arranged on the top surface of the magnetic core 11. (3) The coil device according to claim 2, wherein the magnetic core 11 is integrally molded with the bobbin 2. (4) The coil device according to claim 1, 2 or 3, wherein the moisture-proof coating means is a molded resin envelope 5. (5) The coil device according to claim 4, wherein the moisture-proof coating further includes a watertight seal member between the first collar portion 8 and the resin enclosure 5. (6) Claim 5, wherein the sealing member is an adhesive 6.
The described coil device. (7) The coil device according to claim 5, wherein the sealing member is an elastic O-ring 6a. (8) The moisture-proof coating means includes a pot-shaped moisture-proof housing 5a having an opening on the bottom surface for exposing the tip end surface of the magnetic circuit forming body 4, and the tip-shaped housing 5a and the first flange portion 8. 2. The coil device according to claim 1, further comprising a sealing member 6 or 6a for sealing between the coils.