Automatic optical measurement method

• US 6,922,247 B2
• Filed: 07/26/2001
• Issued: 07/26/2005
• Est. Priority Date: 07/28/2000
• Status: Expired due to Fees

• Current Assignee: Otsuka Electronics Co., Ltd. (Otsuka Holdings Company Limited)
• Original Assignee: Otsuka Electronics Co., Ltd. (Otsuka Holdings Company Limited)
• Inventors: Taguchi, Kunikazu, Sawamura, Yoshimi, Fujimura, Shinji, Inamoto, Naoki
• Primary Examiner(s): Rosenberger, Richard A.
• Application Number:
  US10/333,990
• Publication Number:
  US 20030147081A1
• Time in Patent Office: 1,461 Days
• Field of Search: 356445-448, 356/434
• US Class Current: 356/448
• CPC Class Codes: G01N 2021/4745 Fused bundle, i.e. for backscatter
• CPC Class Codes: G01N 21/276 with alternation of sample and standard in optical path
• CPC Class Codes: G01N 21/4785 Standardising light scatter apparatus; Standards therefor
• CPC Class Codes: G01N 21/55 Specular reflectivity
• CPC Class Codes: G01N 2201/128 Alternating sample and standard or reference part in one path

Abstract

In an automatic optical measurement method according to the invention, with a movable reflection plate 6 moved to place under an optical axis, light projected from a light projecting portion 3a is received by a light receiving portion 3b via the movable reflection plate 6, a stationary reflection plate 11 and the movable reflection plate 6, whereas with the movable reflection plate 6 moved away from the optical axis and a reference 8 set on a sample stage 10, light projected from the light projecting portion 3a is received by the light receiving portion 3b via the reference 8 whereby a ratio between the intensities of the received lights is determined. During a sample measurement, light projected from the light projecting portion 3a with the movable reflection plate 6 moved to place under the optical axis is received by the light receiving portion 3b via the movable reflection plate 6, stationary reflection plate 11 and movable reflection plate 6 so that the intensity of light thus received and the above ratio are used for estimating an intensity of light to be measured with the reference, the estimated intensity of light being used for correcting an intensity of light received via a sample.

Claims

1. An automatic optical measurement method including a light projecting portion and a light receiving portion disposed in close adjacency to each other for taking measurement on light projected from the projecting portion onto a sample and thence reflected,

wherein a transparent or translucent member is fixed in place between the sample, and the light projecting and receiving portions for reflecting a part of the light projected from the light projecting portion into the light receiving portion, comprising

determining a ratio between a measurement of an intensity of light reflected by the transparent or translucent member and a measurement of intensity of light reflected by a reference, by using a measurement of intensity of light reflected from the transparent or translucent member and a measurement of intensity of light taken with the reference set in place and

estimating an intensity of light assumed to be obtained if the reference were set in place during a sample measurement, by using a measurement of intensity of light taken from the transparent or translucent member and the ratio thus determined, so as to correct the measurement of intensity of light reflected from the sample.

2. An automatic optical measurement method as claimed in claim 1, wherein the transparent or translucent member is tightly adhered to the light projecting and receiving portions.

3. An automatic optical measurement method as claimed in claim 1, wherein the transparent or translucent member is spaced away from the light projecting and receiving portions.