Nikon Corporation

Fujikoki Corporation

Denso Corporation

Hitachi-lg Data Storage, Inc.

Masashi Yamashita

Satoshi Miwa

Tomoki Ito

Ayumu Makida

Yoko Komatsubara

Akihiko Obama

Katsuya Watanabe

Keigo Koida

Azuna Nonaka

Tomonori Kuribayashi

Hiroshi Yamamoto

Takeru Uehara

Hiroshi Yabumoto

Keisuke Tsubonoya

Daisuke Kondo

Kenichi Mochizuki

Takeshi Kannoo

Yusuke Arai

Toshinori Take

Takayuki Matsumoto

Takao Harada

Junya Hayakawa

Seiichi Hara

Fumihito Ichikawa

Takamitsu Mano

Kazuhiro Aoyama

Akino Kondo

An optical system (LS) has an aperture stop (S), and a positive lens (L) disposed closer to the object side than the aperture stop (S). The positive lens (L) satisfies the following conditional expressions.−0.010<1−(2.015−0.0068×ν1)50.00<ν1<65.000.545<θ1−0.010<θ1−(0.6418−0.00168×ν1)where ndP1 is the refractive index to the d line of the positive lens, νdP1 is the Abbe number with respect to the d line of the positive lens, and θgFP1 is the partial dispersion ratio of the positive lens.

Optical system, optical apparatus and method for manufacturing the optical system, and zoom optical system, optical apparatus and method for manufacturing the zoom optical system

This optical system (OL) has a first lens group (G) having positive refractory power, a second lens group (G), a third lens group (G), and a fourth lens group (G) which are aligned in order from an object side along an optical axis, wherein when focused from an infinity object to a short-distance object, the second lens group (G) and the third lens group (G) move in mutually different trajectories along the optical axis, and the second lens group (G) and the third lens group (G) are composed of three or less lenses in total.

Optical system, optical apparatus and method for manufacturing the optical system

A valve gear includes a valve main body having a valve chamber in an inner portion, a valve body having a flow channel space in an inner portion and changing a flow rate for fluid by being rotated and driven within the valve chamber, a first flow channel hole formed in the valve main body and communicated with the flow channel space to allow the fluid to pass through, a second flow channel hole formed in the valve main body changing a communicated state with the flow channel space by a rotational displacement position of the valve body and allowing the fluid to pass through when being communicated with the flow channel space, and a transmission mechanism including a valve body drive shaft transmitting a drive force for rotating the valve body to the valve body. Rotation axes of the valve body and the valve body drive shaft are orthogonal.

Valve gear

An optical system and an optical apparatus that have favorable imaging performance and a method for manufacturing the optical system are provided. An optical system OL includes, sequentially from an object side, a front group Ghaving positive refractive power and a focusing group Gthat performs focusing by moving in an optical axis direction, the front group Gincludes, sequentially from the object side, a first lens L, a second lens L, and a third lens L, and the optical system OL satisfies a condition expressed by an expression below,0.10<23/1<0.75

Optical system, optical apparatus, and method for manufacturing optical system

This optical system (LS) has an aperture diaphragm (S) and a negative lens (L) disposed closer to an object side than the aperture diaphragm (S) and satisfies the following conditional expression.−0.010<1−(2.015−0.0068×ν1),50.00<ν1<65.00, 0.545<θ1,−0.010<θ1−(0.6418−0.00168×ν1). Where, ndN1 is a refractive index of the negative lens with respect to a d-line,

A variable magnification optical system has, in order from an object side: a first lens group having positive refractive power; a second lens group having negative refractive power; an aperture stop; a third lens group having positive refractive power; and a rear lens group. Upon zooming from a wide-angle end state to a telephoto end state, at least the rear lens group is moved toward the object side, and distances between the lens groups are varied. Upon focusing from an infinitely distant object to a closely distant object, the third lens group is moved along the optical axis. At least a portion of the rear lens group constitutes a vibration reduction lens group having negative refractive power and moveable perpendicular to the optical axis. An optical apparatus and a method of manufacture are also provided.

Variable magnification optical system, optical device, and method for producing variable magnification optical system

An optical system (LS) has a lens (L) that satisfies the following conditional expressions.−0.010<−(2.015−0.0068×ν)50.00<ν<65.00 0.545<θ−0.010<θ−(0.6418−0.00168×ν)

An optical system (LS) includes lenses (L,L) satisfying the following conditional expressions,νLZ<35.0, and0.702<θFLZ+(0.00316×νLZ),

Optical system, optical apparatus, and method of manufacturing optical system

An optical system (LS) has an aperture stop (S), and a negative lens (L) disposed closer to the image side than the aperture stop (S) and satisfying the following conditional expressions.−0.010<2−(2.015−0.0068×ν2),50.00<ν2<65.00,0.545<θ2,−0.010<θ2−(0.6418−0.00168×ν2)where ndN2 is the refractive index to the d line of the negative lens, νdN2 is the Abbe number with respect to the d line of the negative lens, and θgFN2 is the partial dispersion ratio of the negative lens.

An optical system (LS) includes lenses (L,L) satisfying the following conditional expressions,+(0.01425×)<2.12, andν35.0,where ndLZ: a refractive index of the lens with reference to d-line, and

A compact zooming optical system, an optical apparatus and a method for manufacturing the zooming optical system having a vibration reduction function, a high zooming ratio, a wide-angle view and superb optical performance are provided, the system including, in order from an object side: a first lens group Ghaving positive refractive power; a second lens group Ghaving negative refractive power; a third lens group Ghaving positive refractive power; and a fourth lens group Ghaving negative refractive power; upon zooming from a wide-angle end state to a telephoto end state, a distance between the first lens group Gand the second lens group G, a distance between the second lens group Gand the third lens group Gand a distance between the third lens group Gand the fourth lens group Gbeing respectively varied; the third lens group Ghaving, in order from the object side, a first segment group Ghaving positive refractive power and a second segment group G; the second segment group Gbeing moved to have a component in a direction perpendicular to the optical axis; and predetermined conditional expressions being satisfied.

Zooming optical system, optical apparatus and method for manufacturing zooming optical system

A flow channel switching valve includes a valve stem that is attached to a ball valve member. The flow channel switching valve includes a potentiometer shaft that is press-fitted into an attachment hole provided in an end surface of the valve stem, and a potentiometer that detects a rotation angle of the potentiometer shaft around an axis. The potentiometer shaft has a small-diameter portion, a medium-diameter portion, and a large-diameter portion that are sequentially connected in a direction of the axis, and is supported rotatably around the axis in the attachment hole in an inserted state before being press-fitted into the attachment hole. The large-diameter portion is press-fitted into an upper end portion of the attachment hole.

Flow channel switching valve

An optical system (LS) Includes lenses (L22,L23) satisfying the following conditional expressions,&#x3c;35.0, and0.702&#x3c;&#x3b8;+(0.00316&#xd7;&#x3bd;),where &#x3bd;dLZ: Abbe number of the lens with reference to d-line, and

There is provided a light source module in which an optical element is accommodated in a housing, in which three projection portions are provided in the housing, and the light source module has a structure where the optical element is pressed to be brought into contact with the three projection portions by a pressing member, so that the optical element is fixed in the housing.

Growing community of inventors

Tokyo, Japan

Masashi Yamashita