Photomicrographic apparatus
AssigneeOlympus Optical Co., Ltd.
InventorsSatoru Oosawa, Motokazu Yamana
Life of this patent
Estimating the term…
Abstract
A photomicrographic apparatus, which takes a picture of an enlarged image of a specimen observed under a microscope, causes filter insert/remove means to insert a light intensity-reducing filter in the photometric optical path to a light-receiving element when the light-receiving surface illuminance of the light-receiving element exceeds the upper limit of a first photometry enable illuminance range, and makes the filter insert/remove driving means remove the light intensity-reducing filter from the photometric optical path to the light-receiving element when the light-receiving surface illuminance of the light-receiving element drops below the lower limit of a second photometry enable illuminance range.
Claims10
A photomicrographic apparatus comprising:
- an observation optical system for optically magnifying a specimen;
- a photographic apparatus for receiving a luminous flux from the observation optical system and taking a picture of an enlarged image of said specimen;
- a light-receiving element for receiving a light flux from the observation optical system and, based on the light-receiving surface illuminance, producing an illuminance signal;
- a light source for projecting light on said specimen;
- a light intensity-reducing filter which is inserted in and removed from an optical path running from the light source through said observation optical system to said light-receiving element;
- and
- filter insert/remove driving means which, receiving said illuminance signal from said light-receiving element, inserts said light intensity-reducing filter in said optical path when the light-receiving surface illuminance of said light-receiving element exceeds the upper limit of a first photometry enable illuminance range for a case where said light intensity-reducing filter is removed from said optical path, and removes said light intensity-reducing filter from said optical path when the light-receiving surface illuminance of said light-receiving element drops below the lower limit of a second photometry enable illuminance range for a case where said light intensity-reducing filter is inserted in said optical path.
A photomicrographic apparatus comprising:
- an observation optical system for optically magnifying a specimen;
- a photographic apparatus for receiving a luminous flux from the observation optical system and taking a picture of an enlarged image of said specimen with a photographic film;
- an exposure shutter placed in an optical path running from said observation optical system to said photographic apparatus;
- a shutter open/close driving circuit for opening and closing the exposure shutter;
- an advance motor for advancing said photographic film;
- a film advance motor driving circuit for actuating the advance motor;
- a switch input circuit for entering setting conditions for exposure;
- a display circuit;
- an insert circuit which, receiving said illuminance signal from said light-receiving element, issues an insert command to said filter insert/remove driving circuit when the light-receiving surface illuminance of said light-receiving element exceeds the upper limit of a first photometry enable illuminance range with said light intensity-reducing filter removed from said optical path;
- a remove circuit which issues a remove command to said filter insert/remove driving circuit when the light-receiving surface illuminance of said light-receiving element drops below the lower limit of a second photometry enable illuminance range with said light intensity-reducing filter inserted in said optical path;
- an exposure circuit for computing an exposure time on the basis of the setting conditions for exposure and the light-receiving surface illuminance of said light-receiving element;
- a display control circuit for displaying the setting conditions for exposure and the exposure time;
- a shutter open/close circuit for controlling said shutter open/close driving circuit according to said exposure time when the shutter release is actuated;
- and
- an advance circuit for actuating said film advance motor driving circuit after the completion of exposure to advance said photographic film in said photographic apparatus.
Dependencies are inferred from the claim text.