Focus detecting unit, and refractive index measuring apparatus and non-contact thermometer using the same
AssigneeOlympus Corporation
InventorMitsuru Namiki
Life of this patent
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Abstract
The focus detecting unit includes, a light source unit emanating a collimated light, an optical unit to be inspected, which is equipped with a container having translucency, a lens and liquid, a deflection unit which irradiates a light to the unit to be inspected by diffracting a light from the light source, a spot position detecting means 4 arranged near a backside focus plane of the optical unit to be inspected, and an operating means which calculates the composite focal length of a lens and liquid in the optical unit to be inspected by using the spot position detected by the spot position detecting means.
Claims7
A focus detecting unit comprising,
- a light source unit emanating a collimated light
- an optical unit to be inspected, having a transparent container in which a space holding an optical element and liquid is formed,
- a deflection unit having a diffraction optical component, arranged between the light source and the optical unit to be inspected,
- a spot position detecting means arranged near a backside focus plane of the optical unit to be inspected, and
- an operating means which calculates a composite focal length of the optical element and liquid in the optical unit to be inspected using the spot position detected by the spot position detecting means.
Dependencies are inferred from the claim text.