CN2341119Y

CN2341119Y - Improved grating sensor

Info

Publication number: CN2341119Y
Application number: CN 98224265
Authority: CN
Inventors: 宗伟强; 张国栋
Original assignee: Shanghai Measuring & Cutting T
Current assignee: Shanghai Measuring & Cutting T
Priority date: 1998-06-11
Filing date: 1998-06-11
Publication date: 1999-09-29
Anticipated expiration: 2008-06-11

Abstract

The utility model relates to an improved grating sensor which is composed of a fixed grating and a movable grating. The movable grating is provided with a sending electrode and a receiving electrode; grating groups are distributed on the sending electrode; the receiving electrode b is the long strip shape; the length of the receiving electrode on the movable grating is smaller than or equal to the length of the sending electrode on the movable grating; grounding electrodes D1 and sensing electrodes D2 which are spaced mutually are distributed on the fixed grating; the length of the fixed grating is shorter than the length of the sending electrode of the movable grating. After the length of the fixed grating is shorter than the length of the sending electrode of the movable grating, the displacement space between the movable grating and the fixed grating is enlarged correspondingly and the external dimension of a dial gauge is reduced correspondingly, so that the convenience can be brought to the design and the manufacture.

Description

Improved capacitor grid transducer

The utility model relates to survey sensor, refers to a kind of improved capacitor grid transducer of dial gauge that is used for particularly.

Existing capacitive displacement transducer is widely used on Electronic-digital Readout Measuring Tool, this sensor comprises moving grid and fixed grid (can consult Fig. 1, Fig. 2 earlier), moving grid is provided with sender electrode and receiving electrode, be furnished with grid sets on the sender electrode, each group grid has eight grid bars, and the area size of each grid bar is consistent, and each group grid (eight grid bars) is one-period T, as when six groups of grid sets, the length of sender electrode is 6T just.Receiving electrode b is a strip, and its length is less than the length of sender electrode.When the length of sender electrode was 6T, the length of receiving electrode b can only be got 5T, 4T ... 1T.Be furnished with earthing pole D1 and induction electrode D2 separately on the fixed grid, be one-period T between two induction electrode D2, the length of fixed grid is greater than the length of the sender electrode of moving grid, as 7T, 8T ... sender electrode is sent to electric capacity on the induction electrode D2 on the fixed grid, and with fixed grid displacement become the electric capacity signal of continuous linear change to be coupled to the receiving electrode b of moving grid on one with moving grid by induction electrode D2, deliver to the circuit of back then and handle.Electronic digital centigrade indicator all adopts this capacitor grid transducer, it is motionless that it is fixed in watchcase with moving grid, move with it and fixed grid is fixed on the sounding rod of table, the physical dimension of this table is generally decided by the pitch (pitch number * period T) and the displacement between moving grid and the fixed grid of sensor, the length of fixed grid is long more, fixed grid in dial gauge in the space just big more, the physical dimension of digital display centimeter also will increase thereupon, other associated mechanical part size in addition also correspondingly increases, and brings inconvenience for design and manufacturing for this reason.

For this reason, the purpose of this utility model provides a kind of improved capacitor grid transducer, can reduce its physical dimension and design and manufacturing brings convenience for it after this sensor is used to digital display centimeter.

To achieve these goals, the utility model adopts following technical scheme: sensor comprises moving grid and fixed grid, moving grid is provided with sender electrode and receiving electrode, be furnished with grid sets on the sender electrode, each group grid has eight grid bars, and the area size of each grid bar is consistent, and each group grid is one-period T, receiving electrode b is a strip, and the receiving electrode length on the moving grid is less than the length of sender electrode; Be furnished with earthing pole D1 and induction electrode D2 separately on the fixed grid, be one-period T between two induction electrode D2, it is characterized in that: the equal value of length of fixed grid and moving grid sender electrode is the integral multiple of period T, the length that is shorter in length than the moving grid sender electrode of fixed grid.

Because after the utility model is length less than the moving grid sender electrode with the Design of length of the fixed grid of sensor, the size of fixed grid is reduced in digital display centimeter, displacement space between moving grid and the fixed grid also reduces accordingly, so the physical dimension of digital display centimeter also reduces accordingly, for it designs and manufacturing is provided convenience.

Below in conjunction with drawings and Examples, the utility model further separated continue:

Fig. 1 is the moving grid structural representation of existing sensor.

Fig. 2 is the fixed grid structural representation of existing sensor.

Fig. 3 is one of moving grid structural representation of the utility model sensor.

Fig. 4 be the utility model sensor the moving grid structural representation two.

Fig. 5 is the fixed grid structural representation of the utility model sensor.

Fig. 6 is the utility model sensor construction schematic side view.

Fig. 7 is installed on structural representation behind the digital display centimeter for the utility model sensor.

See also Fig. 1, shown in Figure 2, be furnished with six groups of grids on the moving grid sender electrode of existing sensors, each the group grid have eight grid bar a1, a2 ... a8, each group grid is one-period T, when six groups of grid sets, the length of sender electrode is 6T just, and receiving electrode b is a strip, the length of receiving electrode b can only be got 5T, 4T ... 1T, it is shorter in length than the length (6T) of sender electrode.And be furnished with earthing pole D1 and induction electrode D2 separately on the fixed grid, be one-period T between two induction electrode D2, the length of fixed grid is longer than the length of the sender electrode of moving grid, as 7T, 8T ..., in dial gauge, fixed grid is to be fixed on the sounding rod of table, sounding rod is to move up and down, and moving grid is to be installed on the watchcase, so fixed grid is long more, displacement space between fixed grid and the moving grid is just more little, and the physical dimension of table must design big more.

Please continue to consult respectively Fig. 3-Fig. 5, the utility model sensor comprises moving grid and fixed grid equally, moving grid is provided with sender electrode and receiving electrode, be furnished with grid sets on the sender electrode, each group grid has eight grid bar a1 ... a8, the area size of each grid bar is consistent, each group grid is one-period T, receiving electrode b is a strip, receiving electrode b among Fig. 3 on the moving grid is shorter in length than the length of sender electrode, as sender electrode length value is 8T, and the length of receiving electrode b just can be 7T, 6T, 5T ... 1T.When sender electrode length value was 9T, the length of receiving electrode b was also as the same 8T, the 7T of just can be ... 1T is shorter than the length of sender electrode to guarantee it.Certainly, the length of sender electrode also can be identical with receiving electrode b length, is 9T as the length of sender electrode among Fig. 4, and the length of receiving electrode b also is 9T.Among Fig. 5, be furnished with earthing pole D1 and induction electrode D2 separately on the fixed grid, be one-period T between two induction electrode D2, in same sensor, the equal value of the length of fixed grid and moving grid sender electrode is the integral multiple of period T, the length that is shorter in length than the moving grid sender electrode of fixed grid when if the length of moving grid sender electrode is 6T, can be 2T or 3T, 4T or 5T with the Design of length of fixed grid just.When the length of moving grid sender electrode is 5T, can with the Design of length of fixed grid 1T, 2T, 3T, 4T just.

Fig. 6 has illustrated to have formed the situation of the utility model sensor when moving grid 7 and fixed grid 8 are staggered relatively.

See also Fig. 7, the fixed grid of sensor is installed on the slide block 2 of dial gauge sounding rod 1, and can move up and down with it, moving grid is installed on the watchcase 3, moving grid and fixed grid keep a constant gap, and anti-bull stick 4 is fixed in to be surveyed on the reason bar, can eliminate the rotation of sounding rod 1, the ergometry of table is guaranteed that by dynamometer spring 5 gap bridge pulley 6 can change the pulling force of spring 5.From figure, also as can be seen,, help to reduce the physical dimension of dial gauge, like this design of his-and-hers watches and make and all brought convenience when the length of fixed grid during less than the length of moving grid.

Claims

1, a kind of improved capacitor grid transducer, sensor comprises moving grid and fixed grid, moving grid is provided with sender electrode and receiving electrode, be furnished with grid sets on the sender electrode, each group grid has eight grid bars, and the area size of each grid bar is consistent, and each group grid is one-period T, receiving electrode b is a strip, and the receiving electrode on the moving grid is shorter in length than the length of sender electrode; Be furnished with earthing pole D1 and induction electrode D2 separately on the fixed grid, be one-period T between two induction electrode D2, it is characterized in that: the equal value of length of fixed grid and moving grid sender electrode is the integral multiple of period T, the length that is shorter in length than the moving grid sender electrode of fixed grid.

2, capacitor grid transducer as claimed in claim 1 is characterized in that: the receiving electrode length on the described moving grid also can be identical with the length of sender electrode.