Abstract: An objective optical system includes in order from an object side a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power, wherein focusing is carried out by moving the second lens group with respect to a change in an object-point distance, and the following conditional expressions (2) and (3) are satisfied: 3<|?|??(2), and 60°<???(3), where, ? denotes a lateral magnification of the overall objective optical system at the time of focusing to an object point at a close distance, and ? denotes the maximum half angle of view at the time of focusing to an object point at a long distance.

Abstract: A laser beam expander has at least two negative lenses with adjustable collimation. The amount of required motion can be reduced by an order of magnitude over single negative lens approaches by splitting the input lens in two and adjusting the small remaining air gap between the lenses. The change in collimation may be accomplished by heating/cooling (i.e., thermal), mechanical motion (e.g., motors), electro-optical means (e.g., applying or reducing an electric current), any combination thereof, or any other suitable mechanism.

Abstract: A light guide for a virtual image device to guide and emit image light output from an image display element to display a virtual image. The light guide includes a light-guide member and an optical member. The light-guide member includes an incidence portion to receive the image light and an exit portion to emit the image light to an outside, and a reflective portion inclined relative to the incidence portion to guide the image light received by the incidence portion into the light guide. The light-guide member also includes an extraction portion including first planes each inclined relative to the exit portion and second planes each parallel with the exit portion, to guide the image light from each first plane to the exit portion and extract the image light. The optical member includes a parallel plane and an inclined portion.

Abstract: An optical image capturing system includes, along the optical axis in order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. At least one lens among the first to the sixth lenses has positive refractive force. The seventh lens can have negative refractive force, wherein both surfaces thereof are aspheric, and at least one surface thereof has an inflection point. The lenses in the optical image capturing system which have refractive power include the first to the seventh lenses. The optical image capturing system can increase aperture value and improve the imaging quality for use in compact cameras.

Abstract: A virtual image display apparatus, adapted for medical surgical applications, with which a surgical device is operated is provided. The virtual image display apparatus includes at least one virtual image display module which is disposed in front of at least one eye of a user. The virtual image display module includes an image display unit and a beam splitting unit. The image display unit provides an image beam, wherein the image beam includes at least one type of surgical information. The beam splitting unit is disposed on the transmission path of the image beam and an object beam from an environment object. The beam splitting unit causes at least part of the object beam to be transmitted to the eye, and causes at least part of the image beam to be transmitted to the eye to display a virtual image.

Abstract: A system includes a focusing element configured to receive electromagnetic radiation coaxially and to focus the electromagnetic radiation to generate focused radiation. The system also includes a refracting element having an associated focal plane. The refracting element is configured to receive the focused radiation, and to refract the focused radiation to produce refracted radiation having an annular pattern at the focal plane. The system also includes a slit lamp having a receiving element to receive the refracted radiation.

Abstract: An endoscope is provided having a shaft and an optical system disposed in the shaft. The optical system defines an optical path. The optical system includes a first relay lens and a first meniscus lens positioned in the optical path and between an intermediate image plane and the first relay lens. In one embodiment, a second relay lens and a second meniscus lens, the first relay lens and the first meniscus lens residing on a first side of the intermediate image plane, and the second relay lens and the second meniscus lens residing on a second side of the intermediate image plane, wherein the first and second sides of the intermediate image plane are opposing sides.

Abstract: An embodiment of the present invention provides an image pick-up lens system, an imaging module having the image pick-up lens system, and a terminal having the imaging module. The system includes the following lenses arranged sequentially from an object side to an image side: a first lens with positive focal power; a second lens with negative power, having a convex object-side surface; a third lens with negative power; a fourth lens; a fifth lens with positive power, having a convex image-side surface; and a sixth lens having a concave image-side surface near an optical axis. With proper focal power allocation and a large aperture diameter configuration, the length of the lens system is effectively shortened, aberration is reduced, and imaging quality is improved.

Abstract: An imaging lens consists of, in order from the object side, a first lens group fixed during focusing, and a positive second lens group moved toward the object side during focusing from a distant object to a close object. The second lens group consists of, in order from the object side, a first cemented lens consisting of a biconvex lens and a negative lens having a smaller absolute value of curvature radius of the object-side surface than that of the image-side surface, and a second cemented lens as a whole having a positive refractive power and consisting of a negative lens having a smaller absolute value of curvature radius of the image-side surface than that of the object-side surface and a positive lens having a smaller absolute value of curvature radius of the object-side surface than that of the image-side surface. The imaging lens satisfies specific condition expressions.

Abstract: A photographing optical lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element has negative refractive power. The second lens element has negative refractive power. The fourth lens element has positive refractive power. The fifth lens element has positive refractive power. The sixth lens element has negative refractive power. The photographing optical lens assembly has a total of six lens elements, and the photographing optical lens assembly further includes an aperture stop.

Abstract: A backlight device including an optical sheet diffusing and outputting light from a light guide plate, a frame member having an opening corresponding to a light output surface of the light guide plate, the frame member being provided between the light guide plate and the optical sheet to secure a positional relationship therebetween. The device also includes a plurality of securing members provided at a peripheral edge of the frame member, which secure the optical sheet, are each coupled with the frame member via a thin hinge, and each include a pressing portion having a hole, where the pressing portion presses the optical sheet to the frame member. The frame member is provided with protrusions respectively fit into the holes. The optical sheet includes perforations, and the protrusions are inserted through the perforations and fit into the holes, and the pressing portions press the optical sheet to the frame member.

Abstract: A lens includes an optically transparent substrate having a first lens surface and a second lens surface opposite to the first lens surface. The first lens surface includes a plurality of Fresnel structures. A respective Fresnel structure of the plurality of Fresnel structures includes a slope facet and a draft facet. The draft facet is characterized by a draft angle. The draft angle of the respective Fresnel structure is based on a distance of the respective Fresnel structure from a center of the lens.

Abstract: A lens barrel includes a frame body, a support frame, and a refracting lens frame. The support frame is configured to be supported by the frame body and move within a plane perpendicular to the optical axis with respect to the frame body. The refracting lens frame includes a lens support portion and is configured to retract around a retraction shaft. The frame body includes an opening portion. The opening portion is configured to open outward with respect to the optical axis. The opening portion is configured to house part of the lens support portion during a transition period between an imaging enabled state and a housed state. The support frame includes a light blocking portion. The light blocking portion is provided in front of part of the opening portion in an optical axis direction in order to block light rays.

Abstract: A lens barrel and an imaging device utilizing the same includes a fixed cylinder that has a guide groove; a cam cylinder which is rotatably provided to the fixed cylinder and has a cam groove having a tapered section; and a moving lens support member that supports a moving lens and movably supports a cam follower that moves along the guide groove. The cam follower has a tapered contact section, which can be brought into contact with the tapered section of the cam groove, and is impelled radially outward by the cam follower impelling member.

Abstract: An optical image capturing system includes, along the optical axis in order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. At least one lens among the first to the fifth lenses has positive refractive force. The fifth lens can have negative refractive force, wherein both surfaces thereof are aspheric, and at least one surface thereof has an inflection point. The lenses in the optical image capturing system which have refractive power include the first to the fifth lenses. The optical image capturing system can increase aperture value and improve the imaging quality for use in compact cameras.

Abstract: A lens includes a barrel and a first optical element. The barrel includes an inner circumferential surface surrounding an axis and defining an accommodation space, an object side and an image side spaced at two ends of the axis and interconnecting with the accommodation space, and a first mounting portion integrally formed around the inner circumferential surface. The first mounting portion includes a first blocking portion having a first blocking surface corresponding to the object side. The first optical element is received in the accommodation space, and disposed in the first mounting portion, and includes a first body portion and a first stopping portion. The first stopping portion includes a first stopping surface leaning against the first blocking surface. The distance between an outermost edge of the first stopping portion and the axis is greater than the distance between an innermost edge of the first blocking portion and the axis.

Abstract: Various stacks of arrays of beam shaping elements are described. Each array of beam shaping elements can be formed, for example, as part of a monolithic piece that includes a body portion as well as the beam shaping elements. In some implementations, the monolithic pieces may be formed, for example, as integrally formed molded pieces. The monolithic pieces can include one or more features to facilitate stacking, aligning and/or centering of the arrays with respect to one another.

Abstract: Disclosed is a composite array camera lens module, including: a first lens layer disposed at a position from a diaphragm toward an object space having a first-type lens and a second-type lens; a second lens layer disposed at a position from the diaphragm toward an image space having a third-type lens and a fourth-type lens, wherein the first-type lens and the third-type lens are positive lenses and form a first camera lens with a first effective focal length, and the second-type lens and the fourth-type lens are a negative lens and a positive lens, respectively, and form a second camera lens with a second effective focal length less than the first effective focal length; and an image sensor arranged at a side of the second lens layer away from the diaphragm, wherein the first lens layer, the second lens layer and the image sensor are designed to be parallel flat planes.

Abstract: An optical element is provided with an optical layer in which a concavo-convex surface is formed on the surface thereof, and a wavelength-selective reflection layer formed on the concavo-convex surface. The wavelength-selective reflection layer directionally reflects light having a specific wavelength band selectively, while transmitting light having wavelength bands other than the specific wavelength band. The concavo-convex surface is provided with a plurality of first structural elements that are extended in a first direction within the surface of the optical layer and a plurality of second structural elements that are extended in a second direction within the surface of the optical layer, and placed to be spaced apart from each other, with the first direction and the second direction intersecting with each other.

Abstract: A surface-emitting laser apparatus includes a surface-emitting laser substrate; a microlens substrate; and an adhesion agent. The surface-emitting laser substrate includes a semiconductor substrate; and a surface-emitting laser and plural first adhesion fixing regions formed on a first face of the semiconductor substrate. The microlens substrate includes a microlens configured to receive light emitted by the surface-emitting laser; plural pier portions protruding toward a side of the first face of the semiconductor substrate; and plural second adhesion fixing regions, formed at positions corresponding to the first adhesion fixing regions on surfaces of the pier portions. The adhesive agent causes the first adhesion fixing regions and the second adhesion fixing regions to adhere to each other. A restoring force acts on the adhesive agent in a case where the adhesive agent is melted.