Nikon Vision Co., Ltd.

Sumitomo Chemical Company, Limited

Zs Elastomers Co., Ltd.

Yosuke Miyazaki

Toshiro Matsuo

Hitoshi Ohmuro

Satoshi Arai

Takao Takizawa

Jesus Rodriguez Castanon

Masako Imai

Kenji Shikama

The conjugated diene-based polymer of the invention comprises an aromatic vinyl unit based on an aromatic vinyl compound and a conjugated diene unit based on a conjugated diene compound, is modified with a compound containing a heteroatom, and has an SP value of 16.80 MPato 17.10 MPa.

Conjugated diene-based polymer, conjugated diene-based polymer composition, and method for producing conjugated diene-based polymer

A variable-power optical system includes, in order from an object, an objective optical system (O), a relay optical system (R), and an eyepiece optical system (E), wherein the relay optical system is provided with, in order from the object, a first lens group (G) having positive refractive power, a second lens group (G) having positive refractive power, and a third lens group (G) having positive refractive power, and is an optical system in which an image formed by the objective optical system with variable optical power, and the variable-power optical system is configured so as to satisfy expressions: 0.7&#x3c;|&#x3b2;|&#x3c;1.4, and 12 (mm)&#x3c;f&#x3c;15 (mm), where |&#x3b2;|denotes a minimum of absolute value of imaging magnification of the relay optical system, and fdenotes a shortest focal length.

Variable-power optical system

A distance measuring apparatus includes: a light-transmitting unit that transmits signal light from a light source toward a target object; a light-receiving unit that has a light-receiving element and receives the signal light from the target object on an optical axis different from that of the light-transmitting unit; a distance measuring unit that measures a distance to the target object based on propagation time from light transmission to light reception of the signal light; and a compensating unit that, while either optical path of an optical path from the light-transmitting unit to the light-receiving unit or an optical path from the target object to the light-receiving element is fixed, compensates an optical path of the signal light by displacing the other optical path at the light-transmitting unit or the light-receiving unit.

Distance measuring apparatus and method for calibration

An anti-vibration optical system is an observation optical system including, in sequence from an object side, an objective optical system, an erecting prism, and an ocular optical system, wherein: in sequence from the object side, the objective optical system includes a first lens group having a positive refracting power and a second lens group having a negative refracting power; in sequence from the object side, the second lens group comprises a positive lens group having a positive refracting power and a negative lens group having a negative refracting power; and an image position can be changed by the negative lens group of the second lens group being displaced in a direction orthogonal to an optical axis.

Anti-vibration optical system

Provided are a reticle unit that can secure excellent visibility of a reticle regardless of the background and an optical instrument including the reticle unit. A reticle unitused in an optical instrument such as a rifle scopeincludes: a reflectorprovided with a concave portionon one of surfaces of a plate-like optical member, wherein at least part of a side surface of the concave portionis a reflection surface; a light sourcethat is arranged laterally to the reflectorand that emits light; and a light collectorthat is arranged between the light sourceand the reflectorand that collects the light from the light sourceto guide the light to the reflection surface, wherein at least part of the light incident on the reflection surfaceis totally reflected by the reflection surfaceand emitted from the other surface of the reflector

Reticle unit, optical instrument, and rifle scope

Provided are an ocular zoom optical system which has a wide apparent field of view even on a low power side and in which aberrations are favorably corrected while a sufficient eye relief is secured over the entire zoom range, and an optical instrument including the ocular zoom optical system. The ocular zoom optical systemincludes, in order from the object side: a first lens group Ghaving a negative refractive power; a second lens group Ghaving a positive refractive power; and a third lens group Ghaving a positive refractive power and at least one aspheric surface. An intermediate image I' is formed between the first lens group Gand the second lens group G. During zooming, the third lens group Gis fixed on the optical axis, and the first lens group Gand the second lens group Gare moved in directions opposite to each other with the intermediate image I&#x2032; interposed therebetween. The second lens group Gincludes, in order from the object side: a positive single lens Lhaving a higher positive refractive power on the lens surface on the eye-point side than that on the lens surface on the object side; and a positive cemented lens CLincluding a positive lens Land a negative lens L

Ocular zoom optical system and optical instrument

The invention is directed to accurate calculation of a birefringence of a polymer stretched and oriented. Disclosed is a method for calculating a birefringence of a polymer in an information processing apparatus, having an amorphous state generating step including accepting input of a parameter, generating a model of the polymer on the basis of the parameter, and bringing the model into an amorphous state; a stretching step including stretching the model brought into the amorphous state; a birefringence calculating step including calculating a birefringence of the stretched model; and an outputting step including outputting the birefringence thus calculated.

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Ichihara, Japan

Yosuke Miyazaki