Abstract: An immersion microscope objective includes a first lens group having a positive refractive power, a second lens group having a positive refractive power, and a third lens group having a negative refractive power. The first lens group includes a first lens surface and a second lens surface. The first lens surface is positioned nearest to the object side, and the second lens surface is positioned on an image side of the first lens surface and nearest to the first lens surface. The conditional expression ?3?(rG12/f)×(NAob/ndimm)2??1.7 is satisfied, in which rG12 denotes a radius of curvature at the second lens surface, f denotes a focal length of an entire system of the immersion microscope objective, NAob denotes an object-side numerical aperture of the immersion microscope objective, and ndimm denotes a refractive index of an immersion liquid for a d-line.

Abstract: An immersion microscope objective includes, a first lens group having a positive refractive power, a second lens group having a positive refractive power, and a third lens group having a negative refractive power, wherein the first lens group includes a first lens surface and a second lens surface, the first lens surface is positioned nearest to the object side and the second lens surface is positioned on an image side of the first lens surface and nearest to the first lens surface, and the following conditional expression (1) is satisfied: ?3?(rG12/f)×(NAob/ndimm)2?1.7??(1) where rG12 denotes a radius of curvature at the second lens surface, f denotes a focal length of an entire system of the immersion microscope objective, NAob denotes an object-side numerical aperture of the immersion microscope objective, and ndimm denotes a refractive index of an immersion liquid for a d-line.

Abstract: A flyback boost circuit includes an output voltage detection terminal provided to a secondary winding of a transformer of the flyback boost circuit, and configured to detect an output voltage. Prior to the start of a boost operation, current is supplied to a secondary side of the transformer via the output voltage detection terminal to detect a voltage generated at the output voltage detection terminal, to thereby detect an unwired state by determining whether or not there is floating of the output voltage detection terminal or a grounding terminal of the secondary winding of the transformer.

Abstract: An optical microscope, which has a light source, for observing a sample by illuminating light from the light source on the sample includes a second light source that is different from the light source and is insertable/removable in/from the optical path of the optical microscope. The second light source is configured to have the peak of an emission spectrum only in a wavelength range of 400 to 490 nm.

Abstract: A flyback boost circuit includes an output voltage detection terminal provided to a secondary winding of a transformer of the flyback boost circuit, and configured to detect an output voltage. Prior to the start of a boost operation, current is supplied to a secondary side of the transformer via the output voltage detection terminal to detect a voltage generated at the output voltage detection terminal, to thereby detect an unwired state by determining whether or not there is floating of the output voltage detection terminal or a grounding terminal of the secondary winding of the transformer.

Abstract: An optical microscope, which has a light source, for observing a sample by illuminating light from the light source on the sample includes a second light source that is different from the light source and is insertable/removable in/from the optical path of the optical microscope. The second light source is configured to have the peak of an emission spectrum only in a wavelength range of 400 to 490 nm.

Abstract: An infrared microscope includes a light source emitting infrared light, an objective optical system forming an image of a specimen, and a path switching member switching an optical path from a visual observation optical path in which an infrared-light blocking member is placed, to another optical path to introduce light from the objective optical system thereinto. The infrared microscope is constructed so that an image which is free of aberration due to infrared light and has no unnatural hue due to a large amount of light with long wavelengths can be obtained without moving an element for blocking the infrared light.

Abstract: An infrared microscope includes a light source emitting infrared light, an objective optical system forming an image of a specimen, and a path switching member switching an optical path from a visual observation optical path in which an infrared-light blocking member is placed, to another optical path to introduce light from the objective optical system thereinto. The infrared microscope is constructed so that an image which is free of aberration due to infrared light and has no unnatural hue due to a large amount of light with long wavelengths can be obtained without moving an element for blocking the infrared light.