Optical measuring device

a measuring device and optical technology, applied in the direction of measurement devices, optical radiation measurement, instruments, etc., can solve the problems of increased measurement errors and likely causes of measurement errors, and achieve the effects of reducing measurement errors, high output, and high snr

Active Publication Date: 2007-10-18
OTSUKA DENSHI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0042]The optical measuring device of the present invention has an observation window on a plane mirror that passes the center of an integrating hemisphere, and therefore, can prevent light that has come directly from a light source from entering the observation window without providing any baffle in the integrating space. As a result, there is no self-absorption of the baffle and no vignette of reflected bundle of rays, thus reducing measurement errors due to these phenomena. Consequently, the total luminous flux can be measured at a high output and with a high SNR.

Problems solved by technology

However, since such a supporting member and the lamp itself absorb light to cause a measurement error, the supporting member is often coated with the same material as that applied onto the inner surface of the integrating sphere.
However, since the baffle itself absorbs light, the measurement error would increase just like the lamp supporting member arranged in the full integrating sphere.
As a result, measurement errors are likely to be caused in both of these situations.

Method used

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embodiment 1

[0057]A first preferred embodiment of an optical measuring device according to the present invention will be described with reference to FIG. 1.

[0058]The optical measuring device of this preferred embodiment is a total luminous flux measuring device that includes an integrating hemisphere 2, of which the inner wall surface functions as a light diffuse reflective surface 1, and a plane mirror 3 to close the opening of the integrating hemisphere 2. The light diffuse reflective surface 1 is formed by either coating the inner surface of the integrating hemisphere 2 with a diffusive material that diffuses the radiation to be measured or processing the inner surface of the integrating hemisphere 2. The plane mirror 3 has a central opening that functions as either a light entering window or a light source fitting hole 5 and an observation window 6′ that enables a photodetector 6 to take measurements. The center of radius of curvature of the hemisphere 2 is defined within the central openin...

embodiment 2

[0078]A second preferred embodiment of an optical measuring device according to the present invention will be described with reference to FIG. 2.

[0079]The photometer shown in FIG. 2 includes an integrating hemisphere 2, of which the inner wall surface functions as a light diffuse reflective surface 1, and a plane mirror 3, which is arranged so as to close the opening of the integrating hemisphere 2, including the center of curvature thereof. A light source 4, of which the total luminous flux should be measured, is fitted into a light source fitting window 5, which is arranged at the center of curvature of the integrating hemisphere 2 on the surface of the plane mirror 3. Meanwhile, a photodetector 6 is fitted into an observation window 6′ on the surface of the plane mirror 3 but is arranged such that the light source 4 is invisible to the photodetector 6.

[0080]Next, the operating principle of the photometer of this preferred embodiment will be described.

[0081]The light source 4 of t...

embodiment 3

[0101]A third preferred embodiment of an optical measuring device according to the present invention will be described with reference to FIG. 5.

[0102]The device of this preferred embodiment (total luminous flux measuring device) includes an integrating hemisphere 2, of which the inner wall surface functions as a light diffuse reflective surface 1, and a plane mirror 3, which is arranged so as to close the opening of the integrating hemisphere 2, including the center of curvature thereof. A light source 4, of which the total luminous flux should be measured, is fitted into a light source fitting window 5, which is arranged at the center of curvature of the integrating hemisphere 2 on the surface of the plane mirror 3. In this preferred embodiment, a luminometer 8 measures the luminance at an infinitesimal surface element A on the inner wall of the integrating hemisphere 2 through an observation window 6′ on the plane mirror 3.

[0103]Next, the operating principle of the photometer of t...

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Abstract

An optical measuring device according to the present invention includes: a plane mirror (3), which has a central opening that functions as either a light entering window or a light source fitting hole (5) and an observation window 6′ that enables a photodetector (6) to take measurements; and an integrating hemisphere (2), which has its center of radius of curvature defined within the central opening of the plane mirror (3) and of which the inner wall surface functions as a light diffuse reflective surface (1). The plane mirror (3) and the integrating hemisphere (2) form an integrating space inside.

Description

[0001]This is a continuation of International Application No. PCT / JP2006 / 307776, with an international filing date of Apr. 12, 2006, the contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an optical measuring device that can measure the total luminous flux of a light source.[0004]2. Description of the Related Art[0005]Among various optical measuring devices, a total luminous flux measuring device can measure the total luminous flux of a surface emitting light source such as a display with respect to a total luminous flux standard lamp, which is a cylindrical light source. A typical conventional total luminous flux measuring device includes a perfect integrating sphere, of which the inner surface is coated with a perfectly diffuse reflective material such as barium sulfate. A sample lamp, which is the object of measurement, is arranged at the center of the integrating sphere and its l...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01J1/00
CPCG01J1/04G01J1/0422G01J1/0455G01J2001/4247G01J1/42G01J2001/0481G01J1/08G01J1/02
Inventor OHKUBO, KAZUAKI
Owner OTSUKA DENSHI CO LTD
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