Abstract: Polarizing split layers 26 and reflection layers 27 are provided on bonding surfaces between prism rods 24a and 24b. Polarization conversion devices 25 are bonded to an emission surface from which linearly polarized light being reflected by the polarizing split layers 26 and reflected by the reflection layer 27 are emitted. The polarization conversion devices 25 are formed by bonding plural prism rods 30 with side surfaces being inclined by 45° with respect to an incidence surface. Retardation films formed of dielectric multilayers are provided between the bonding surfaces to give a phase difference of a ½wavelength to transmitted light. The retardation films and bonding borderlines 31 are inclined by 45° within a plane perpendicular to an optical axis of linearly polarized light so that an optical axis of the retardation film has an angle of 45° with respect to a polarization direction of the linearly polarized light.

Abstract: In a multi-focus camera apparatus that photographs the same region with cameras having different focal lengths, detection means for detecting a specified target in images obtained by the cameras, region acquisition means for obtaining in the images regions comprising pixels having substantially the same relationships between blurriness degrees as relationships between blurriness degrees of the specified target having been detected in the respective images, and image processing means for carrying out image processing to display the obtained regions differently from other regions are included.

Abstract: An electronic endoscope apparatus comprises: an intermediate member attached to a first cable of an electronic endoscope; a connector connected to a light source portion or to a processor portion; a second cable extending from the intermediate member and connecting to the connector; and a flexible outer-sheath for the second cable, the flexible outer-sheath comprising a flexible spiral tube and a resin outer skin provided on an exterior of the flexible spiral tube, wherein the flexible spiral tube is formed by spirally winding a strip body having engaging-projections respectively provided on its both side portions, so as to make the engaging-projections be engaged with each other and form a movable space which allows one of the engaging-projections to move with respect to the other one of the engaging-projections, and wherein an entirety of the flexible spiral tube is bendable with expansion and contraction of a space between the engaging-projections within the movable space.

Abstract: A projection optical system having a magnification side and a reduction side for forming a magnified image on a magnification side image surface conjugate with a reduction side conjugate image surface includes, arranged in order from the reduction side, a first imaging system including a plurality of lens elements and lens components and a second imaging system including a mirror having a concave, aspheric reflecting surface. An intermediate image is formed between the first imaging system and the second imaging system. The projection optical system satisfies specified conditions related to the travel of principal rays through the projection optical system and related to the Abbe number of a lens element having positive refractive power of the first imaging system. A projection display device includes the projection optical system and may include a light valve for modulating a light beam for projection on a screen.

Abstract: A prism sheet is bonded to the bottom faces of rectangular prisms constituting a polarization beam splitter array. In the front face of the prism sheet, a plurality of rectangular prism elements are arranged in parallel to each other and a phase difference compensation film is formed on the surface. The edge lines of the rectangular prism elements are inclined at 45 degrees relative to the edge lines of the rectangular prisms. Linear polarized light of S-polarization component reflected by a polarized light separation film is reflected twice sequentially in a phase difference compensation film formed in a pair of oblique faces of the rectangular prism elements, so that the polarization direction is rotated by 90 degrees and then the light reenters the rectangular prism. Then, the light is transmitted through the polarized light separation film and then extracted from the rectangular prism.

Abstract: The present invention provides a visible and infrared light image-taking optical system which can facilitate changing a wavelength of infrared light used to take an infrared video image with an infrared light camera and which can achieve an infrared video image not affected by infrared light of any wavelength other than a desired wavelength, by separating object light incident on an image-taking optical system into object light in a visible light region and object light in an infrared light region and taking an object image formed by each object light for each object light in each wavelength region decomposed by the color separation optical system.

Abstract: Two types of layers are simultaneously formed on a substrate and another substrate under the same layer forming condition, the heights of which are equal to a half height of an intended retardation compensation layer. Physical properties of the respective two types of layers formed on the substrates are identical to each other, and if deviations are produced in retardation distribution characteristics for azimuth angles of incident light, these deviations are commonly provided in the respective two types of layers. When one substrate is superposed with the other substrate and these superposed substrates are integrated with each other in order to make a single sheet of retardation compensation element, after one of these substrates is rotated by an angle of 90 degrees with respect to the other substrate, these substrates are stuck to each other by an adhesive agent.

Abstract: A lens moving frame according to an embodiment of the invention includes a holder portion. The holder portion includes: wall portions having guide holes formed therein; partition walls into which a guide bar is inserted and which are provided near the corresponding wall portions; and lubricant reservoir portions that are provided between the partition walls and the wall portions and have a lubricant filled and stored therein. The lubricant stored in the lubricant reservoir portion is adhered to the guide bar disposed between the partition wall and the wall portion. When the lens moving frame is moved along the guide bar, an extra lubricant is scraped off from the guide bar by the guide holes and opening portions of the partition walls and then stored in the lubricant reservoir portions.

Abstract: A lens device includes: a lens barrel body having holes; guide bars supported by the lens barrel body and one ends of the guide bars are inserted in the holes; lens holding frames supported so as to be movable along the guide bars and are engaged with the guide bars; and pressing members that press the one ends of the guide bars in a direction perpendicular to the guide bars and are inserted in the holes. The pressing members have a falling-off prevention engagement protrusion engaged with the lens barrel body.

Abstract: On condition that a first lens group adopts at least one plastic lens; a second lens group adopts at least any two adjacent plastic lenses; the first lens group monotonously moves from an object side to an image plane side in a zooming; the second lens group monotonously moves from the image plane side to the object side; wherein fw/fpi represents a ratio of refractive power of the entire system achieved at a wide angle end to refractive power of the respective lenses; P1 represents a total of fw/fpi of the plastic lenses of the first lens group; and P2 represents a total of fw/fpi of the plastic lenses of the second lens group, the following conditional expressions ?0.22<P1<?0.01 and ?0.15<P2<?0.03, are both fulfilled.

Abstract: An objective lens consists of a single lens element. A light source side surface is formed into a convex surface having a large curvature, and an optical recording medium side surface has a small curvature. The both surfaces are formed into aspheric surfaces. Also, the objective lens satisfies the following expressions (1) to (3): 0.70<NA<0.98??(1) 0.70<d/f<3.00??(2) 0.50<g/d<0.80??(3) where NA denotes a numerical aperture of the objective lens on an optical recording medium side, d denotes a thickness, in mm, of the objective lens on an optical axis, and g is a distance, in mm, from a tangential plane that is perpendicular to the optical axis and is tangent to a vertex of the light source side surface of the objective lens, to a center of gravity of the objective lens.

Abstract: In an electronic endoscope system, an RF signal is produced through quadrature modulation of a picture signal that is representative of an image taken through an electronic endoscope. When control signals are entered by an operator through a control section of the electronic endoscope, a data superimposing section superimposes the entered control signals on the RF signal in horizontal scanning intervals within a vertical blanking interval. The RF signal having the control signals superimposed thereon is sent as an electric wave of a single frequency band to a processor. In the processor, a data analyzer carries out sampling to extract the entered control signals if they are superimposed on the picture signal, and analyzes the contents of the entered control signals. Based on the results of analysis, a CPU controls respective components of the signal processor.

Abstract: An integrator unit for integrating an incoming light beam for a uniform distribution of illumination comprises an inner cylinder fixedly equipped with a rod integrator, an outer cylinder in which the inner cylinder is coaxially received for axial movement and axial adjustment members which comprises a circumferential groove spatially squared to a center axis of the inner cylinder and a radial access bore formed in the outer cylinder. A round shaped position adjustment tool has an end pin on a round end face thereof in a position off center from an axis of rotation of the position adjusting tool. The position adjusting tool is inserted in the radial access bore to put the end pin in the circumferential groove and turned in the radial access bore so as thereby to move the inner cylinder axially back and forth.

Abstract: A zoom lens is provided and includes: a first lens group having a positive power, a second lens group having a negative power, a stop, a third lens group having a positive power, and a fourth lens group having a positive power in order. Zooming is performed by moving at least the first lens group, the second lens group, the stop, and the third lens group along the optical axis. During zooming, the stop is moved so as to be closer to an image plane at a wide-angle end than at a telephoto end and to be closer to the second lens group at the telephoto end than at the wide-angle end. The following conditional expressions (1) and (2) are satisfied. For the conditional expressions (1) and (2), fw is a focal length at the wide-angle end of the entire system, ft is a focal length at the telephoto end of the entire system, f1 is a composite focal length of the first lens group, and X1 is a displacement of the first lens group during zooming from the wide-angle end to the telephoto end. 4.0<f1/fw<7.0??(1) 0.

Abstract: An image reading lens system of Example 1 includes six lenses having first to sixth lenses being arranged in order from an object side and an aperture diaphragm. In the image reading lens system, the first lens, the third lens, and the sixth lens are formed of negative lenses, and the second lens, the fourth lens, and the fifth lens are formed of positive lenses. The first lens, the second lens, the third lens, and the fifth lens are made of glass, and surfaces of all these lenses are formed of spherical surfaces. The fourth lens and the sixth lens are made of resin, and surfaces of the fourth lens and surfaces of the sixth lens are formed of aspheric surfaces. A cemented lens is formed of the second lens and the third lens with a cemented surface interposed therebetween, and is disposed adjacent to the aperture diaphragm.

Abstract: In an endoscope apparatus in which a scope is connected to a processor unit in a freely attachable and detachable way, the endoscope apparatus wherein matrix calculation is conducted for RGB signals formed by using CCD, a color space conversion processing circuit is provided for forming spectral images of the arbitrarily selected wavelength range. CCD characteristics identification information including types of color filters of the CCD and spectral characteristics or scope characteristics information is stored in the ROM of the scope, a plurality of matrix data corresponding to characteristics identification information is stored in the memory of the processor unit, and matrix data corresponding to the obtained characteristics information is read from the memory, thereby forming an excellent spectral image by using data suitable for characteristics of the CCD or the scope.

Abstract: An objective lens for converging light emitted from a light source on an optical recording medium to record and reproduce information consists of a single lens having at least one aspheric surface. The following conditional expressions (1) to (3) are satisfied: N?1.75??(1) 0.5<f/f1<0.6??(2) 0.8<d/(NA·De)<1.0??(3) where N denotes a refractive index, f denotes a focal length (mm), f1 denotes a focal length (mm) of a light source side surface, d denotes a thickness (mm) on an optical axis, NA denotes a numerical aperture on an optical recording medium side, and De denotes an effective aperture (mm) of the light source side surface.

Abstract: Disclosed are a projection lens that has a simple inner focus structure, an appropriate back focal length, telecentricity, a high optical performance, and a small size and can effectively correct, particularly, lateral chromatic aberration, and a projection display device. A projection lens includes a first lens group having a negative refractive power and a second lens group having a positive refractive power arranged in this order from a magnification side. A fifth lens arranged closest to a reduction side in the first lens group is moved along an optical axis to adjust focus, and at least two lenses are made of a material with anomalous dispersion capable of reducing chromatic aberration in a wide visible range.

Abstract: An imaging lens comprises, in order from an object side: a first lens having a positive refractive power; a second lens having a negative refractive power whose concave surface faces to the object; and a third lens having a positive refractive power and having a meniscus form that has a convex surface, facing to the object, in a portion at and around an optical axis of the imaging lens; wherein the first, second and third lenses have at least one aspheric surface, and wherein the imaging lens satisfies conditional expressions given below: 0.7<f1/f<1.3 ??(1) 0.3<D2/f<0.5 ??(2) 1.0<|f2/f|<3.0 ??(3) 1.2<f3/f<4.0 ??(4) where f: a focal length of an overall system, f1: a focal length of the first lens, f2: a focal length of the second lens, f3: a focal length of the third lens, and D2: a spacing, on the optical axis, between the first lens and the second lens.