JPS60143747A - Continuous optical axis direction measuring apparatus - Google Patents

Abstract

PURPOSE:To enable continuous measurement of a long-sized sample by providing a means for moving a long-sized sample to be measured perpendicular to the orthgonal Nicol optical system to measure the intensity of transmission light while the sample is fed from one side of a case surrounding the optical system and discharged on the other side thereof. CONSTITUTION:A holder 11 having a sample 10 to be measured being set is inserted from one side of a case 40 containing an orthgonal Nicol optical system comprising a light source 1, polarizers 3a and 3b and a photo detector 4 along a guide rail 37 and discharged on the other side thereof while the intensity of transmission light is measured at positions along the length of the sample 10. A reference sample 20 delivered from the lot identical to the sample 10 is set on a holder 21 and rotated about the optical axis C with a control knob 65 while the intensity of transmission light is measured to determine the relationship thereof with the deviated angle from the optical axis. In addition, the deviated angle at positions of the sample 10 is determined by collating the intensity of transmission light of the sample 10 with that of the sample 20.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous optical axis direction measuring device, and more particularly to a device that can continuously measure the optical axis direction at each position along the length of a transparent sample.

When measuring the optical axis direction of a transparent sample, as shown in FIG. A chip-shaped sample to be measured 2 is inserted between the polarizers 3a and 3b of the crossed Nicol optical system so that its surface is orthogonal to the axis of the optical system, and the sample is rotated around the axis of the optical system. The optical axis of the sample was determined from the relationship between the rotation angle and the transmitted light intensity of the optical system. However, with such conventional devices, for example, in the case of a long and slender sample whose optical axis direction changes at each position along its length, in order to know the optical axis direction at each position, it is necessary to It is necessary to divide the sample into pieces of appropriate size and measure the optical axis direction for each sample piece, resulting in a large amount of labor and time loss.

The present invention solves the above-mentioned drawbacks of the prior art and makes it possible to continuously measure the optical axis direction in the longitudinal direction of a long sample, and also enables smooth supply and discharge of the sample to be measured during the measurement. The purpose of the present invention is to provide an optical axis direction measuring device that can be used to measure the direction of an optical axis.

The present invention will be specifically explained with reference to the drawings. FIG. 2 is a perspective view showing an embodiment of the present invention, with a part of the case cut away.

Light source 1. Two polarizers 3a whose optical axes are perpendicular to each other.

3b and the light receiver 4 are arranged in a uniaxial direction to form an orthogonal Nicol optical system. A case 4o is provided to cover this orthogonal Nicol optical system. A means for transporting a sample to be measured is arranged in a direction perpendicular to the optical axis C of the crossed Nicol optical system. The conveying means includes a motor as a driving source and a speed reducer 30. Transmission belt 32. Boo IJ33, 34. Conveyor belt 35° Bank up roller 36. Guide rail 37.
It consists of a guide roll 38. A guide rail 37 is provided passing through the case 40, and the holder 11 containing the sample 10 to be measured is conveyed along the rail 37. The transport is carried out by a pair of transport bells) 35.35 is the sample holder 1 to be measured.
This is done by contacting the frame portion 11a of No. 1 from both sides and sandwiching the frame portion 11a. The puncture up roller 36 is attached to the belt 35.
35 assists in pinching. In addition, the guide roll 3
8 are provided in pairs outside the case 40 to maintain the posture of the sample holder 11. Measurement sample 10
A light-shielding hood 50 is provided at the entrance and exit of the case 40, and a light-shielding screen 51. A light shielding roller 52 is provided. The sample 10 to be measured is passed on the guide rail 37 and between the guide rolls 38 and 38, and then placed in the hood 50.
Lower entrance provided in the.

The light enters the case 40 from above, traverses the orthogonal Nicol optical system, and is discharged from an opening provided in the hood 50 on the opposite side. The operator only has to insert the tip of the holder 11 with the sample 10 to be measured into the case 40 along the guide rail 37, and then pull out the holder 11 that has come out from the case 40 after the measurement is completed.

The reference sample 20 is used to provide a reference value for the relationship between the transmitted light intensity I measured on the sample to be measured 10 and the optical axis deviation angle φ, and is used before or after the measurement operation using the sample to be measured 10. The reference sample holder 21 is inserted,
placed on the optical axis C. This reference sample holder 21 is
Worm 21° first gear 62. Second gear 63. Conduction shaft 64. Operation knob 65. It is rotated around the optical axis C by external operating means consisting of an angle scale 66 or the like.

The operation of measuring the optical axis direction at each position in the longitudinal direction of the sample to be measured 10 using this apparatus will be explained.

First, the holder 11 with the sample to be measured 10 set therein is inserted from one side of the case 40 along the guide rail 37 without the reference sample 20 set therein.

The sample 10 to be measured is transported by the transport means, continuously crosses the optical axis C of the crossed Nicol optical system, and is discharged from the other side of the case 40. Thereby, the transmitted light intensity I at each position along the longitudinal direction of the sample 10 to be measured is measured. Next, a reference sample 20 cut out from the same loft as the sample to be measured 10 is set in the holder 21, and the transmitted light intensity I is measured while rotating it around the optical axis C by an external operating means.

The following relationship holds between the transmitted light intensity I and the deviation angle φ of the optical axis of the sample 10.20 (the deviation angle between the optical axis of the polarizer 3a and the optical axis of the sample 10.20).

1(X: sin' (2φ) Since the reference sample 20 is rotated at least 90 degrees, there is always a □ point where I=O, and the position of this point is the position of the deviation angle φ=0.Therefore, the reference sample 20 Then, the deviation angle φ and the strength■
Since there is a one-to-one correspondence, the deviation angle φ at each position of the sample to be measured 10 can be determined by comparing the transmitted light intensity ■ at each position in the sample to be measured 10 with that of the reference sample 20. can.

The present invention has the above-mentioned configuration, and is provided with a transport means for continuously moving the sample to be measured in a direction perpendicular to the orthogonal Nicol optical system arranged in the -axis direction, so that the sample can be cut into short pieces. It has now become possible to continuously measure the optical axis of a long piece of paper along its longitudinal direction without any problems. Furthermore, since the sample to be measured only needs to be inserted from one side of the case and extracted from the other side, the operation is extremely simple and smooth. Overall, measurements in the optical axis direction of the sample to be measured can be carried out very quickly and continuously.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the prior art, and FIG. 2 is a partially cutaway perspective view of an embodiment of the present invention. 1 - Light source 3a, 3b - Polarizer 4 - Light receiver 10 - Sample to be measured 11 - Holder 3o - Motor and decelerator 32 - Transmission belt 33. 34 - Pulley 35 - Conveyance belt 36 - Backup roller 37 - Guide rail 38-Guide Roll 40-Case Patent Applicant Nitto Electric Industry Co., Ltd. Agent Patent Attorney Nishi 1) Shin

Claims (1)

[Claims] A crossed Nicol optical system in which a light source, two polarizers, and a light receiver are arranged in a uniaxial direction measures the intensity of the light transmitted through the sample to be measured placed between the two polarizers, and detects the light from the sample to be measured. A device for determining an axial direction, which includes a general feeding means for continuously moving a long sample to be measured in a direction orthogonal to the orthogonal Nicol optical system, and a case in which the sample to be measured surrounds the optical system. 1. A continuous measuring device in the optical axis direction, characterized in that it is configured to measure the intensity of transmitted light while being supplied from one side and extracted from the other side.