초록 ▼

There is disclosed a focus detecting apparatus capable of detecting the focus state of an objective lens in a wide viewing field, comprises a view finder optical unit for observing the image formed by the objective lens, an optical unit for forming a pair of optical amount distributions, based on li

There is disclosed a focus detecting apparatus capable of detecting the focus state of an objective lens in a wide viewing field, comprises a view finder optical unit for observing the image formed by the objective lens, an optical unit for forming a pair of optical amount distributions, based on light beams passing through different areas of the pupil of the objective lens, wherein the optical unit being provided, at the light incident side, with a concave face directed to the light incident side, and, at the light exit side, with a convex face directed to the light exit side, a sensor unit for received said pair of the optical amount distributions, a main mirror positioned in the optical path from the objective lens to the optical unit and adapted to reflect the light beams from the objective lens toward the finder optical unit, and a reflecting mirror having a concave curved face directed to the light entrance side and adapted to reflect the light beams, transmitted by the main mirror, in a direction opposite to the finder optical system and toward the optical unit.

대표청구항 ▼

[ What is claimed is:] [1.] A focus detecting apparatus for detecting a focus state of an objective lens, comprising:a finder optical unit for observing an image formed by said objective lens;an optical unit for forming a pair of optical amount distributions, based on light beams passing through dif

[ What is claimed is:] [1.] A focus detecting apparatus for detecting a focus state of an objective lens, comprising:a finder optical unit for observing an image formed by said objective lens;an optical unit for forming a pair of optical amount distributions, based on light beams passing through different areas of the pupil of said objective lens, wherein said optical unit being provided, at the light incident side, with a concave face directed to the light incident side, and, at the light exit side, with a convex face directed to the light exit side;a sensor unit for receiving said pair of the optical amount distributions;a main mirror positioned in an optical path from said objective lens to said optical unit and adapted to reflect light beams from said objective lens toward said finder optical unit; anda reflecting mirror having a concave curved surface directed to the light incident side and adapted to reflect the light beams, transmitted by said main mirror, in a direction opposite to said finder optical system and toward said optical unit.