Appeal No. 1997-3919
Application 08/392,160
1. An apparatus for observing an object comprising:
an illuminating optical system for illuminating an object
to be observed with visible light;
an observing optical system for observing the object
positioned within a visual field illuminated by said
illuminating optical system;
an index projecting optical system for projecting index
for focus by luminous flux having wavelength of a visible
area, the index projecting optical system having projecting
luminous flux at least a part of which is common with a
wavelength of illumination luminous flux of said illuminating
optical system;
a first luminous flux restricting means for cutting an
illuminating light of the illuminating optical system;
a second luminous flux restricting means for cutting a
projecting light of the index projecting optical system;
means for controlling said first luminous flux
restricting means and said second luminous flux restricting
means so that the illuminating light and the projecting light
do not overlap with each other on said object, and for
controlling the period the illuminating light is off and the
projecting light is on such that the projecting light is
imperceptible as an after image to a normal human eye; and
means for detecting an image of focus index projected on
said object, said means being capable of detecting luminous
flux of visible wavelength;
wherein relative distance of said object with respect to
the focus index is changed based on the results detected by
said detecting means.
5. An apparatus for observing an object comprising:
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