JP2010257584A5 - - Google Patents

Description

In order to solve the above problems, an illumination device according to the present invention includes two or more light sources that emit illumination light, a light source unit disposed around an imaging optical system that forms an image of an object, and two or more light sources And a deflecting unit that changes the size of the illumination visual field of the illumination light in accordance with the zoom ratio of the imaging optical system .

In such an illuminating device, the deflecting unit has a set of two or more optical members having different focal lengths for each light source, and the size of the illumination field of view is made by facing one of the two or more optical members to the light source. Is preferably changed.

Or a deflection | deviation part has the group of two or more optical members from which the distance with a light source differs for every light source, and changes the magnitude | size of an illumination visual field by making either of two or more optical members oppose a light source. It is preferable.

Claims (10)

A light source unit that includes two or more light sources that emit illumination light and that is disposed around an imaging optical system that forms an image of an object ;
A deflection that includes an optical member that condenses the illumination light from two or more light sources and irradiates the object, and changes the size of the illumination field of the illumination light in accordance with the zoom ratio of the imaging optical system A lighting device. The deflecting unit has a set of two or more optical members having different focal lengths for each light source, and the size of the illumination field of view is increased by facing one of the two or more optical members to the light source. The lighting device according to claim 1 to be changed. The deflecting unit has a set of two or more optical members having different distances from the light source for each light source, and makes any one of the two or more optical members face the light source, thereby The lighting device according to claim 1, wherein the size is changed.   The lighting device according to claim 2 or 3, wherein at least one of the light source unit and the deflection unit is relatively moved so that the optical member faces the light source.   The lighting device according to claim 1, wherein the size of the illumination visual field is changed by moving at least one of the light source and the optical member to change a distance between the light source and the optical member. A plurality of sets of the light source and the optical member having different illumination field sizes;
The lighting device according to claim 1, wherein among the light sources, the light source having the same size of the illumination visual field is turned on, and the remaining light sources are turned off to change the size of the illumination visual field.   Each of the said light source part and the said deflection | deviation part is arrange | positioned at the substantially same space | interval on the circumference | surroundings surrounding the imaging optical system which images the light radiate | emitted from the said object surface. The lighting device described.   The lighting device according to any one of claims 1 to 7, wherein the light source is an LED or an optical fiber that guides and emits light from a primary light source.   The illumination device according to claim 1, wherein the optical member is configured by any one of a lens, a mirror, a prism, a diffusion plate, and a diffractive optical element, or a combination thereof. The lighting device according to any one of claims 1 to 9,
And an imaging optical system that focuses light from the object surface to form an image.