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US 6,556,360 B2Granted
Optical element and optical device having it
AssigneeCanon Kabushiki Kaisha
InventorsHiroaki Hoshi, Hiroshi Saruwatari
Life of this patent
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Abstract
An optical element of a transparent body has two refracting surfaces formed in surfaces of the transparent body, and a plurality of reflecting surfaces formed in surfaces of the transparent body. Light incident through one refracting surface into the transparent body is reflected successively by the plurality of reflecting surfaces to be guided to the other refracting surface. At least one of the two refracting surfaces and reflecting surfaces has an optical low pass filter.
Claims7
An optical element of a transparent body comprising:
- two refracting surfaces formed in surfaces of said transparent body;
- and
- a plurality of reflecting surfaces formed in surfaces of said transparent body;
- wherein light incident through one refracting surface into said transparent body is reflected successively by said plurality of reflecting surfaces to be guided to the other refracting surface,
- wherein at least one of said two refracting surfaces comprises an optical low pass filter, said refracting surface comprising the optical low pass filter being a phase grating whose grating pattern extends in a predetermined direction, and
- wherein one of said plurality of reflecting surfaces comprises an optical low pass filter, said reflecting surface comprising the optical low pass filter being a phase grating whose grating pattern extends in a direction different from the predetermined direction.
3 more elements
Dependencies are inferred from the claim text.