Abstract: An achromatic lens system is provided with a cemented resin lens having positive refractive power constructed by a resin lens L11 having positive refractive power cemented with a resin lens L12 having negative refractive power, and a close-contact multi-layer type diffractive optical element L11E, the diffractive optical element L11E being disposed to an image side of the cemented resin lens, the diffractive optical element L11E being constructed by cementing two diffractive element members DE11, DE12 each made of different optical materials with each other, and the cemented surface thereof being a diffractive optical surface Gf on which grooves of a diffraction grating are formed, there by being lightweight and easily manufactured, capable of excellently correcting chromatic aberration and spherical aberration at the same time.

Abstract: A relay zoom system includes, in order from an object side, a first lens group having a positive refractive power and a second lens group having a positive refractive power. Furthermore, in the relay zoom system, the first lens group and the second lens group are each made up of at least two positive lenses and one negative lens. The first lens group and the second lens group in the relay zoom system are configured so as to move along an optical axis when magnification is varied from a lower magnification edge state to a higher magnification edge state.

Abstract: The present application provides a distance measuring apparatus that can measure a distance with accuracy even when a light receiving level of a reflected light becomes saturated. A light emitting section of the distance measuring apparatus emits a measuring light toward an object to be measured. A light receiving section receives the reflected light being reflected from the object to be measured. A distance calculating section obtains a distance to the object to be measured based on an elapsed time which is from a point the measuring light is emitted until a point a light receiving level of the reflected light indicates a peak thereof. A distance correcting section corrects a value of the distance to the object to be measured depending on a length of saturation time of the light receiving level when the light receiving level becomes saturated and the peak is impossible to identify.

Abstract: A laser range finder includes: a light source emitting light from a linear light-emitting portion with making a divergent angle of the light larger in a transversal direction of the light-emitting portion than in a longitudinal direction thereof; an objective lens projecting the light onto a target object and converging reflection light; a partial reflection member disposed between the light source and the objective lens and having a partial reflection surface composed of a transmitting area transmitting light emitted from the light source and receiving areas reflecting reflection light; and a photodetector detecting the reflection light reflected by the receiving areas; wherein the light source and the partial reflection member are disposed with making the longitudinal direction of the light-emitting portion disposed substantially perpendicular to a longitudinal direction of the transmitting area as seen along an optical axis.

Abstract: A laser range finder 100 includes: a light source 10 emitting light from a linear light-emitting portion 10a with making a divergent angle of the light larger in a transversal direction of the light-emitting portion 10a than in a longitudinal direction thereof; an objective lens 30 projecting the light onto a target object and converging reflection light; a partial reflection member 20 disposed between the light source and the objective lens and having a partial reflection surface 21 composed of a transmitting area 21a transmitting light emitted from the light source and receiving areas 21b reflecting reflection light; and a photodetector 40 detecting the reflection light reflected by the receiving areas; wherein the light source and the partial reflection member are disposed with making the longitudinal direction of the light-emitting portion 10a disposed substantially perpendicular to a longitudinal direction of the transmitting area 21a as seen along an optical axis.

Abstract: An ocular lens used in an optical apparatus, such as a telescope optical system, includes the following lens groups sequentially arranged from the object side: a first lens group G1 having negative refracting power; a second lens group G2 including a lens component having a convex surface facing the viewer's eye side; and a third lens group G3 having positive refracting power. An object-side focal plane of the third lens group G3 is located between the second lens group G2 and the third lens group G3. The first lens group G1 includes the following lens components sequentially arranged from the object side: a first lens component G1A having a convex surface facing the object side, having negative refracting power, and having a meniscus shape; and a second lens component G1B having negative refracting power.

Abstract: A laser range finder 100 includes: a light source 10 emitting light from a linear light-emitting portion 10a with making a divergent angle of the light larger in a transversal direction of the light-emitting portion 10a than in a longitudinal direction thereof; an objective lens 30 projecting the light onto a target object and converging reflection light; a partial reflection member 20 disposed between the light source and the objective lens and having a partial reflection surface 21 composed of a transmitting area 21a transmitting light emitted from the light source and receiving areas 21b reflecting reflection light; and a photodetector 40 detecting the reflection light reflected by the receiving areas; wherein the light source and the partial reflection member are disposed with making the longitudinal direction of the light-emitting portion 10a disposed substantially perpendicular to a longitudinal direction of the transmitting area 21a as seen along an optical axis.

Abstract: A laser range finder 100 includes: a light source 10 emitting light from a linear light-emitting portion 10a with making a divergent angle of the light larger in a transversal direction of the light-emitting portion 10a than in a longitudinal direction thereof; an objective lens 30 projecting the light onto a target object and converging reflection light; a partial reflection member 20 disposed between the light source and the objective lens and having a partial reflection surface 21 composed of a transmitting area 21a transmitting light emitted from the light source and receiving areas 21b reflecting reflection light; and a photodetector 40 detecting the reflection light reflected by the receiving areas; wherein the light source and the partial reflection member are disposed with making the longitudinal direction of the light-emitting portion 10a disposed substantially perpendicular to a longitudinal direction of the transmitting area 21a as seen along an optical axis.