JP2550316Y2 - Optical reading linear scale device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical reading linear scale device, and more particularly, to providing an optical reading unit by providing a scale on one of a measuring apparatus main body and a moving body and providing an optical reading unit on the other member. The present invention relates to an optical reading linear scale device that reads a scale of a scale at a section and detects a moving amount of a moving body.

[0002]

2. Description of the Related Art An optical reading type linear scale device is provided in a measuring device and is used for detecting a moving amount of a stylus of the measuring device. That is, the scale of the optical reading linear scale device is provided on the main body of the measuring device, and the moving body provided with the stylus is provided with the optical reading unit. The optical reading unit reads the scale of the scale while the stylus is moving. Thereby, the movement amount of the movement of the stylus is detected, and the shape of the measured object is measured.

When the scale and the apparatus body are made of different materials, it is difficult to set the same thermal expansion and contraction rate to the same. When it is not possible to set the same thermal expansion and contraction rate of the scale and the apparatus main body, it is necessary to independently expand and contract the scale and the measuring apparatus main body. As the method, there are a method of attaching a scale to the measuring device body via an elastic member such as rubber (see FIGS. 5 and 6) and a method of attaching the scale to the measuring device body via a leaf spring (see FIGS. 7 and 8). Are known.

As shown in FIG. 5, a method of attaching a scale to a main body of a measuring device via an elastic member such as rubber is such that a scale 10 is provided with screws 14, 14,.
Is attached to the measuring device main body 16. A spacer 18 is sandwiched between the screw 14 and the scale 10 at the center of the scale 10. Thus, scale 1
The central part of 0 is fixed to the measuring device main body 16. In other mounting portions, an elastic member 22 such as rubber is sandwiched between the washer 20 and the scale 10. Therefore, when the scale 10 and the measuring device main body 16 thermally expand and contract, the elastic member 22 such as rubber is deformed, and each of them can thermally expand and contract independently. In FIG. 6, reference numeral 24 denotes an optical reading unit, and reference numeral 26 denotes a moving body.

A method of attaching the scale to the measuring device main body via a leaf spring is as follows: As shown in FIGS. 7 and 8, the central portion of the scale 10 is attached to the measuring device main body 16 via a spacer 30 with a holding plate 28. The other parts are attached to the measuring device main body 16 by being pressed by leaf springs 29 along the longitudinal direction. In this case, the pressing force of the leaf springs 29, 29,... Is smaller than the pressing force when the scale 10 is directly fixed by the holding plate 28. Therefore, the scale 10 can slide with respect to the leaf springs 29, 29. For this reason, the scale 10 and the measuring device main body 16 can be independently thermally expanded and contracted. 7 and 8, reference numeral 30 denotes a spacer, and reference numeral 32 denotes a screw for fixing the spacer 30 to the measuring apparatus main body 16.

[0006]

However, since the scale 10 must be securely attached to the measuring device main body 16, it is necessary to press the scale 10 against the measuring device main body 16 with a certain pressing force. Therefore, the deformation resistance of the elastic member 22 such as rubber is increased, and the frictional force of the leaf spring 29 is increased.
6 cannot be independently thermally expanded and contracted. As a result, thermal stress is generated in the scale 10 and the measuring device main body 16, so that the measuring device main body 16 is deformed,
In some cases, the length of the scale 10 cannot follow the temperature change. Therefore, there is a problem that the measurement accuracy of the measurement device is reduced.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide an optical reading linear scale device capable of performing highly accurate measurement.

[0008]

According to the present invention, in order to achieve the above object, a scale is provided on one of the main body of the measuring apparatus and the moving body, and an optical reading section is provided on the other member. In the optical reading linear scale that reads the scale of the scale at the section and detects the moving amount of the moving body, the center of the scale is fixed to the upper surface of one of the member of the measuring device main body and the moving body, and the center of the scale is fixed. A double-sided adhesive member having an adhesive portion formed on both upper and lower surfaces of an elastic member that absorbs a difference in thermal expansion and contraction is provided between the back surface of the left and right sides of the scale excluding the portion and the one member, and via the double-sided adhesive member A scale is attached to the one member.

[0009]

According to the present invention, the optically readable linear scale has a scale and an optically readable section. The scale is provided on one member of the measuring device main body and the moving body, and the optical reading section is provided on one member of the measuring device main body and the moving body. Then, the scale of the scale is read by the optical reading unit, and the moving amount of the moving body is detected.

In this case, the scale has a central portion fixed to one of the measuring device main body and the movable body, and furthermore, the left and right side portions of the scale are bonded to one of the measuring device main body and the moving body by a double-sided adhesive member. Is glued through.
The elastic member of the double-sided adhesive absorbs a difference in thermal expansion and contraction between the scale and one of the measuring device main body and the moving body. Therefore, even if there is a difference in thermal expansion and contraction between the scale and any one of the measuring device main body and the moving body, the scale can expand and contract following the temperature change, and the deformation of the measuring device main body can be prevented. Altitude measurement becomes possible.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an optical reading linear scale device according to the present invention; FIG. 1 is a front view of an optical reading linear scale device according to the present invention, FIG. 2 is an enlarged view of a main part, and FIGS. 3 and 4 are AA of FIG.
It is sectional drawing and BB sectional drawing.

As shown in FIG. 1, a central portion 50A of a scale 50 of an optical reading linear scale device has a device main body 52.
It is fixed to. That is, as shown in FIG. 4, the holding plate 54 has a leg portion and a pressing portion.
6 is pressed downward. Therefore, the leg portion of the holding plate 54 presses the fixed spacer 58, and the pressing portion presses the central portion 50 </ b> A of the scale 50. This allows
The central portion 50A of the scale 50 is fixed to the fixed spacer 58 via the holding plates 54,54. Fixed spacer 5
8 is fixed to the apparatus main body 52 via the screws 60, 60, so that the central portion 50A of the scale 50 is
It is fixed to.

The spacers 62, 62 are arranged at a fixed distance from the center 50A of the scale 50 in the longitudinal direction of the scale 50.
Are fixed to the apparatus main body 52 via screws 63, 63 (see FIG. 3), respectively. The lower surfaces of the double-sided adhesive tapes 64, 64,... Are bonded to the spacers 62, 62, respectively.

The double-sided adhesive tape 64 has an elastic member 64A such as a sponge at the center as shown in FIG.
Adhesive portions 64B and 64C are provided on both surfaces of the elastic member 64A. The elastic member 64A is set to have a sufficiently low shear resistance (that is, the deformation resistance of the elastic member 64A is small enough to be ignored) and has excellent heat resistance. The adhesive strength of the adhesive portions 64B and 64C is 5
It is set so as to be able to support 0 mass and has excellent heat resistance.

Therefore, the scale 50 is adhesively supported by the apparatus main body 52 at a predetermined interval in the longitudinal direction. Further, when the scale 50 and the measuring apparatus main body 52 are thermally expanded and contracted, the elastic members 64A are deformed and become independent. And expand and contract with heat.
In FIG. 1, reference numeral 66 denotes an optical reading unit, and 68 denotes a moving body. The operation of the optical reading linear scale device according to the present invention will be described.

The amount of thermal expansion and contraction of the scale 50 is
The case where the thermal expansion / contraction amount is larger than 2 will be described. Since the central portion 50A of the scale 50 is fixed to the apparatus main body 52, the scale 50 is distributed to both sides from the central portion 50A and thermally expands and contracts. In this case, since the scale 50 has a larger thermal expansion and contraction amount than the measuring device main body 52, the scale 50 and the measuring device main body 52 are misaligned. However, since the scale 50 is adhered to the apparatus main body 52 at regular intervals with double-sided adhesive tapes 64, 64,.
The gap between the measuring device main body 52 and the double-sided adhesive tape 64, 6
4 are absorbed by the deformation of the elastic member 64A. Therefore, the scale 50 extends without being restricted by the measuring device main body 52.

Although the case where the thermal expansion and contraction amount of the scale 50 is larger than the thermal expansion and contraction amount of the measuring device main body 52 has been described above, the same applies to the case where the thermal expansion and contraction amount of the scale 50 is smaller than the thermal expansion and contraction amount of the measuring device main body 52. The effect can be achieved. That is, when the thermal expansion and contraction amount of the scale 50 is smaller than the thermal expansion and contraction amount of the measuring device main body 52, the scale 50 contracts without being restricted by the measuring device main body 52.

[0018]

As described above, according to the optical reading linear scale device according to the present invention, the scale is fixed at the central portion to one of the measuring device main body and the moving body, and further, on the left and right sides of the scale. The unit is attached to either one of the measurement device main body and the moving body via a double-sided adhesive member. The elastic member of the double-sided adhesive absorbs a difference in thermal expansion and contraction between the scale and one of the measuring device main body and the moving body.

Accordingly, even when there is a difference in thermal expansion and contraction between the scale and the measuring device main body, the scale can expand and contract following the temperature change, so that the temperature of the scale can be accurately corrected and the measuring device main body or the measuring device main body can be corrected. Deformation of any one of the members of the moving body can be prevented. Therefore,
High-precision measurement becomes possible. In the embodiment, since the scale is attached to any one of the measuring device main body and the moving body via the spacer, the inclination of the scale can be adjusted to adjust the scale reading value. The scale can be easily replaced, but it is also possible to directly attach the scale to any one of the measuring device main body and the moving body without using a spacer.

[Brief description of the drawings]

FIG. 1 is a side view of an optical reading linear scale device according to the present invention.

FIG. 2 is an enlarged view of a main part of the optical reading linear scale device according to the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a sectional view taken along line BB of FIG. 1;

FIG. 5 is a side view of a conventional optical reading linear scale device.

FIG. 6 is a sectional view taken along line AA of FIG. 5;

FIG. 7 is a central sectional view of another embodiment of the conventional optical reading linear scale device.

FIG. 8 is a left and right side sectional view of another embodiment of the conventional optical reading linear scale device.

[Explanation of symbols]

 Reference numeral 50: Scale 50A: Central part of scale 52: Measurement device main body 64: Double-sided adhesive tape (double-sided adhesive member) 66: Optical reading unit 68: Moving body

Claims (1)

(57) [Scope of request for utility model registration] 1. A scale is provided on one member of a measuring apparatus main body and a moving body, and an optical reading section is provided on the other member, and a scale of the scale is read by the optical reading section to detect a moving amount of the moving body. in an optical reading linear scales, the central portion of the scale as well as fixed to the upper surface of one of the members of the measuring device main body or the mobile body and the back of the left and right sides of <br/> scale except for the central portion Adhesive portions are formed on the upper and lower surfaces of the elastic member that absorbs the thermal expansion difference between the one member and the one member.
The the provided double-sided adhesive member, scale via the double-sided adhesive member
An optical reading linear scale device , wherein a tool is attached to said one member .