Abstract: Disclosed is a unit substrate for an optical device, the unit substrate including: an optical device-mounting region provided on an upper surface of the unit substrate; and first and second metal substrates bonded to each other with a vertical insulating layer interposed therebetween. A lower surface of the unit substrate is electrically connected to the mounting region, and side and upper surfaces of the unit substrate are electrically isolated from the mounting region such that an optical device is capable of operating in an environment with low electrical resistance.

Abstract: An optical device substrate includes a substrate body having a mounting space formed thereon, and a lamination layer formed on the substrate body. A groove for connecting the mounting space and the outside of the substrate body is patterned in the lamination layer.

Abstract: An optical device substrate includes a substrate body having a mounting space formed thereon, and a guide pattern laminated on the substrate body and configured to guide a cover for covering the mounting space.

Abstract: An iris recognition optical system having short total length includes first lens having positive diopter and second lens having negative diopter and axially disposed in alignment with first lens. The first lens includes second reflecting surface located on object side around optical axis, first transmissive surface with concave curvature located on object side around second reflecting surface and exhibiting vertical profile relative to said optical axis, second transmissive surface located on image side around optical axis, and first reflecting surface located on image side around second transmissive surface. As first lens is configured to provide two opposite reflecting surfaces, focal length of system can be greatly shortened, and therefore, the system can be installed in cell phone, smart phone, tablet computer, notebook or any other low-profile mobile electronic device, allowing product user to easily and stably get iris images from a distance of about 300 mm.

Abstract: Provided is a diaphragm pump guaranteed with operational reliability that enables a fluid to be continuously sucked and discharged by causing a volume change of an working chamber through a diaphragm pulsating according to the flow of compressed air controlled by movement of a spool constituting an air control valve, and smoothly can pump a fluid by reliably controlling the flow of compressed air using an up-and-down motion of a spool performed by pressure of the compressed air, and thus completely resolving an inoperative situation caused by a delay in motion of the spool. The diaphragm pump includes: a pump body (10), a shaft (20), a first diaphragm (30), a second diaphragm (40), and an air control valve (50).

Abstract: A zoom lens optical system includes: a first lens group that is provided close to an object, has a negative refractive power in total, and includes an optical part having a surface that reflects light; a second lens group that has a negative refractive power in total; an iris; a third lens group that has a positive refractive power in total; and a fourth lens group that has a positive refractive power in total.

Abstract: A refractive-type zoom lens optical system includes a first lens group having a negative lens power and including a reflection member, a second lens group having a negative lens power, a third lens group having a positive lens power, a fourth lens group having a negative lens power, and a stop between the second lens group and the third lens group, wherein an overall length of the system is fixed during zooming and focusing.

Abstract: A refractive-type zoom lens optical system includes a first lens group having a negative lens power and including a reflection member, a second lens group having a negative lens power, a third lens group having a positive lens power, a fourth lens group having a negative lens power, and a stop between the second lens group and the third lens group, wherein an overall length of the system is fixed during zooming and focusing.

Abstract: Disclosed is a zoom lens optical system including: a first lens group that is provided close to an object, has a negative refractive power in total, and includes an optical part having a surface that reflects light; a second lens group that has a negative refractive power in total; an iris; a third lens group that has a positive refractive power in total; and a fourth lens group that has a positive refractive power in total. At least one of the second lens group, the third lens group, and the fourth lens group is moved to vary magnification. The second lens group is moved to perform focus adjustment when a distance to an object is changed between a long distance to a short distance, and the distance from a first lens of the first lens group to an imaging surface is fixed even when the lens moves during a change in magnification and the focus adjustment.

Abstract: A real image finder includes an objective lens group, an inverting group and an eyepiece lens group. The objective lens group includes a first lens unit of a negative refractive power, a second lens unit of a positive refractive power, a third lens unit of a positive refractive power, and a first prism of a positive refractive power, where an exit surface of the first prism is convex toward an image. The objective lens group forms an inverted image. The inverting group forms an erect image by inverting the image formed through the objective lens group. The eyepiece lens group magnifies the erect image formed by the inverting group.

Abstract: The present invention relates to a variable magnification finder comprising an objective lens group having a positive refractive power for enabling a wide angle view of an object. The objective lens group includes a first lens sub-group having either a negative or a positive refractive power; a second lens sub-group having a negative refractive power; a third lens sub-group having a positive refractive power and having a cemented lens with at least two pieces; and a fourth lens sub-group having a positive refractive power. The third lens sub-group is movable for magnifying the image, and the second lens sub-group is movable for compensating the focus of the magnified image. The finder further comprises an eyepiece lens group having a positive refractive power for viewing the image.

Abstract: A zoom lens system, includes a first lens group of a positive refractive power viewed from the object's side having a concave lens and convex lens adhered to the concave lens and at least two meniscus lenses whose entrance surfaces are convex; a second lens group of a negative refractive power; a third lens group of a positive refractive power having at least one biconvex aspherical lens, at least one convex lens and a concave lens; and a fourth lens group of a positive refractive power having one concave lens and two convex lenses.The second lens group is movable for changing the magnification, and the fourth lens group is movable for compensating the shift of an image plane caused by the movement of the second lens group and for focusing an image.

Abstract: A photographic lens system, comprising, from an object side, a first lens group having a positive refractive power, and a second lens group having a positive refractive power, wherein the first and the second lens groups comprise at least one cylindrical lens and the photographic lens system satisfies the condition of 1.0<f.sub.1 /f.sub.2 <1.2, where f.sub.1 represents a focal length in the Y direction, and f.sub.2 represents a focal length in the Z direction.The photographic lens system enables an image to be formed at the same position by making the horizontal magnification different from the vertical magnification due to the back focal length in the Y direction being different from that in the Z direction while equating the focal point lengths in the Y and Z directions. The photographic lens system can be used in a high quality camera having a relatively large aperture ratio and a good image forming efficiency.

Abstract: A variable magnification finder has an objective lens group having an overall positive power. A first lens group and a second lens group each have a negative refractive power; a third lens group and a fourth lens group each have a positive refractive power; and an eyepiece lens group has a positive power. The second and third lens groups move to zooming from the wide angle position to the telephoto position, and compensate the change of an aberration resulting from such movement of the second and third lens groups.