Rotation detecting device and method of producing same

Details Rotation detecting device and method of producing same Rotation detecting device and method of producing same

2002-05-24

2004-05-18

Le, N. (Department: 2862)

Electricity: measuring and testing

Magnetic

Displacement

C324S173000, C029S841000

Reexamination Certificate

active

06737863

ABSTRACT:

BACKGROUND OF INVENTION
1. Field of Invention
The present invention relates in general to a detector and a method of producing same and more particularly to a rotation detecting device that detects a rotation speed of a rotation member and a method of producing same.
2. Description of Related Art
Hitherto, as rotation detecting devices, optical and magnetic types have been widely used because these types can detect a rotation speed of a rotation member without contacting the same.
Laid-open Japanese Patent Application (Tokkai) 2000-180460 shows a magnetic type rotation detecting device that detects rotation speed of an automotive road wheel. In the device of this publication, there is used a substrate of insulated plastic material for mounting thereon a given wiring pattern. The plastic material has glass fibers embedded therein for a reliable durability of the substrate. To the substrate, there are further connected through soldering various electronic elements, such as, a magnetic resistance element, Hall element and the like for a sensor. The substrate thus mounting thereon the various electronic elements is installed in a metal case which is fixed to a housing of plastic material.
Laid-open Japanese Patent Application (Tokkai-hei) 11-14644 shows, as is seen from
FIGS. 12 and 13
of the accompanying drawings, a substrate
52
(see
FIG. 13
) which is received in a recess
50
A formed in a housing
50
of plastic material. As is seen from
FIG. 12
, a plastic sealing material
54
is packed in recess
50
A to hermetically install substrate
52
in recess
50
A. The housing
50
has a connector part
56
integrally molded therewith with terminal pins
56
A (only one is shown) as inserts. For assembling the parts, substrate
52
is set in the recess
50
A, then, terminal pins
56
A are soldered to given portions of a wiring pattern on substrate
52
, and then, plastic sealing material
54
is packed in recess
50
A.
SUMMARY OF INVENTION
However, the rotation detecting devices of the above-mentioned publications have failed to provide users with satisfaction. Specifically, due to inherent constructions, production of the devices needs a complicated assembling process which thus brings about increase in cost of the devices.
It is therefore an object of the present invention to provide a rotation detecting device which is easily produced and assembled.
It is another object of the present invention to provide a method of producing the rotation detecting device with ease.
According to a first aspect of the present invention, there is provided a rotation detecting device which comprises an intermediate assembly including terminal pins having given portions, each given portion having at least one projection; a molded plastic base in which the given portions of the terminal pins are embedded with the projections being exposed to the outside; and a plurality of electronic elements connected to the exposed projections of the given portions of the terminal pins, one of the electronic elements being a sensor element which is mounted on the molded plastic base; and a molded plastic housing entirely and hermetically covering the intermediate assembly except a connector part thereof where leading ends of the terminal pins are positioned.
According to a second aspect of the present invention, there is provided a method of producing a rotation detecting device, which comprises (a) setting a plurality of terminal pins in a first mold assembly, the terminal pins having projections; (b) injecting a molten plastic material into the first mold assembly to produce a parts-holder, the parts-holder including a molded plastic base in which given portions of the terminal pins are embedded with the projections being exposed to the outside; (c) connecting electronic elements to the exposed projections of the terminal pins thereby to constitute an intermediate assembly; and (d) molding a housing that hermetically embeds therein the intermediate assembly except leading ends of the terminal pins and has a recess of a connector part to which the leading ends of the terminal pins are exposed.
According to a third aspect of the present invention, there is provided a method of producing a rotation detecting device, which comprises (a) setting a plurality of terminal pins in a first mold assembly, the terminal pins having projections; (b) injecting a molten plastic material into the first mold assembly to produce a parts-holder, the parts-holder including a molded plastic base in which given portions of the terminal pins are embedded with the projections being exposed to the outside; (c) connecting electronic elements to the exposed projections of the terminal pins thereby to constitute an intermediate assembly, the connecting being achieved by one of soldering technique and welding technique; (d) setting the intermediate assembly in a second mold assembly; and (e) injecting a molten plastic material into the second mold assembly to mold a housing that hermetically embeds therein the intermediate assembly except leading ends of the terminal pins and has a recess of a connector part to which the leading ends of the terminal pins are exposed.
According to a fourth aspect of the present invention, there is provided a method of producing a rotation detecting device, which comprises (a) setting a plurality of terminal pins in a first mold assembly, the terminal pins having projections; (b) injecting a molten plastic material into the first mold assembly to produce a parts-holder, the parts-holder including a molded plastic base in which given portions of the terminal pins are embedded with the projections being exposed to the outside; (c) connecting electronic elements to the exposed projections of the terminal pins thereby to constitute a first intermediate assembly, the connecting being achieved by one of soldering technique and welding technique; (d) setting the first intermediate assembly in a second mold assembly; (e) injecting a molten plastic material into the second mold assembly to mold a first housing part that hermetically embeds therein the first intermediate assembly except leading portions of the terminal pins, thereby to produce a second intermediate assembly; (f) setting the second intermediate assembly in a third mold assembly; and (g) injecting a molten plastic material into the third mold assembly to mold a second housing part that hermetically covers one portion of the second intermediate assembly and has a recess of a connector part to which leading ends of the terminal pins are exposed.


REFERENCES:
patent: 4994739 (1991-02-01), Honda et al.
patent: 5488294 (1996-01-01), Liddell et al.
patent: 5631557 (1997-05-01), Davidson
patent: 5963028 (1999-10-01), Engel et al.
patent: 6157186 (2000-12-01), Aoki et al.
patent: 6326779 (2001-12-01), Shinjo et al.
patent: 6427316 (2002-08-01), Shinjo et al.
patent: 6534994 (2003-03-01), Doderer et al.
patent: 6593732 (2003-07-01), Dammkohler et al.
patent: 11-14644 (1999-01-01), None
patent: 2000-180460 (2000-06-01), None

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