Scale on an apparatus for measuring displacement

Details Scale on an apparatus for measuring displacement Scale on an apparatus for measuring displacement

2002-04-22

2004-01-13

Fulton, Christopher W. (Department: 2859)

Geometrical instruments

Distance measuring

Scale reading position sensor

C033S708000, C324S207240

Reexamination Certificate

active

06675491

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a scale on an apparatus for measuring displacement and more particularly to a scale providing a high environmental resistance on an apparatus for measuring displacement.
2. Related Art of the Invention
A scale on an apparatus for measuring displacement, for example, an electronic caliper disclosed in U.S. Pat. No. 5,973,494 to Karl G. Mareliez et al, is bonded to the top surface of a slider's beam assembly (denoted as P in
FIG. 3A
, showing the present invention). Such a the scale includes generally an elongated printed circuit board. A plurality of rectangular gratings
12
are spaced apart along the printed circuit board in an aperiodic pattern on a glass-epoxy substrate
11
. The scale includes also a scale cover
30
which is deposited onto the top surface of a plural of rectangular gratings
12
by for example an adhesive tape or the like. The scale cover
30
serves as a protector for the adhesive layer
20
. The protector
30
can also include a printed marking.
In such a conventional scale used for an apparatus for measuring displacement, since the top surface side of the scale substrate
11
is formed with raised portions by bonding the rectangular grating
12
thereon, it provides an imperfect contact with the scale cover
30
. Consequently contaminated coolant and oil can find their way between the scale member
10
and the scale cover
30
and intrude into the gap therebetween and then the scale cover
30
is easily peeled from the adhesive layer
20
. Thereby contaminated coolant and oil cause measurement errors.
Furthermore when such a is scale used in a conventional shop, coolant and oil may potentially intrude into the gap between the scale member
10
and the scale cover
30
. In some types of oil and non-water-solvent coolants, chlorine and sulfur may cause chemical reaction with the rectangular grating
12
made from copper to make them corroded, to disrupt the rectangular grating
12
and to result in detection error.
This invention has been made in view of the above-described state of the related art, and has for its object to provide a scale for measuring displacement having a significant resistance to the environment such that it provides great reliability in a harmful industrial environment.


REFERENCES:
patent: 5635833 (1997-06-01), Onodera et al.
patent: 5973494 (1999-10-01), Masreliez et al.
patent: 6154974 (2000-12-01), Nakajima et al.
patent: 6442861 (2002-09-01), Boge et al.

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