Abstract: An anti-reflection coat includes an intermediate layer and a low refractive index layer sequentially stacked on a substrate, and preventing the reflection of incident light by optical interference effect, wherein the low refractive index layer is a film formed on the surface of the intermediate layer by a wet film formation method using a coating liquid including layer-constituting raw materials which includes hollow silica particles adhering each other with a binder, and the intermediate layer is a layer mainly composed of an organometallic compound which adheres well to the binder and having wettability to the coating liquid; and provides an optical device including the anti-reflection coat.

Abstract: A zoom lens includes sequentially from an object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, and a fifth lens group having a negative refractive power. The zoom lens satisfies given conditions to implement a compact, large aperture ratio zoom lens having excellent optical performance and compatible with solid state image sensors capable of recording full high vision images.

Abstract: A zoom lens includes sequentially from an object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, and a fifth lens group having a negative refractive power. The zoom lens satisfies given conditions to implement a compact, wide angle, large aperture ratio zoom lens having excellent optical performance and compatible with solid state image sensors capable of recording full high vision images.

Abstract: A zoom lens includes sequentially from an object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, an aperture stop, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, and fifth lens group. The zoom lens further satisfies given conditions.

Abstract: The present invention is directed to providing a large aperture telephotographing zoom lens that employs an inner-focusing system to enable quick focusing and avoid a great aberration when the zoom lens renders the close object in focus. The zoom lens comprises at least five groups of lens pieces arranged in series, namely, the foremost or first lens group of positive refractivity positioned the closest to the object, the succeeding second lens group of negative refractivity, the third lens group of negative refractivity, the fourth lens group of positive refractivity, and the rearmost or fifth lens group of positive refractivity. During varying the magnification for zooming in a transition from the wide-angle end to the telephoto end, all the lens pieces of the second, third, and fourth lens groups are moved toward the image plane, and the third lens group alone is displaced for focusing.

Abstract: In a retractable lens barrel, during imaging, when a drive unit is driven accompanying the extension of the retractable lens barrel, a first lens and a second lens are moved along the optical axis to maintain a given interval between the first lens and the second lens, a rotating member rotates in a given direction and rotates centered about a line parallel to the optical axis, whereby a first optical element is inserted onto the optical axis. The second lens is moved such that a second optical element remains positioned on the optical axis. In this state, the entrance of outside light, which can cause image formation to be negatively affected, is prevented by the rotating member and a base member. Thus, light entering the inside of the retractable lens barrel is limited to the light transmitted by the first optical element and necessary for image formation.

Abstract: The invention provides an infrared fixed-focus lens of which component lens pieces are made of germanium featured by low chromatic dispersion, and have no surface processed to serve as diffraction optics. The infrared fixed-focus lens comprises the first lens piece disposed closer to an object and of negative refractivity, and the second lens piece disposed closer to the image plane and of positive refractivity. Both the first and second lens pieces are made of germanium.

Abstract: In an imaging apparatus, during an utilization state, optical elements and an image sensor are arranged on the same optical axis. During a retracted state, the optical elements in include at least one optical element that is moved from an optical axis position on the optical axis to a first retraction position that differs from the optical axis position; the image sensor is moved from the optical axis position to a second retraction position that differs from the first retraction position; and the moved optical element and the image sensor are arranged such that at least one portion of the move optical element and of the image sensor overlap in a plane substantially orthogonal to the optical axis.

Abstract: The lens barrel assembly suitable for a zoom lens comprises a pedestal barrel member secured to a mount member; a fixed barrel member secured in position closer to an object to the pedestal barrel member and having longitudinal grooves defined therein; a focus cam barrel member, a focus interlocking plate, and a first cam barrel member, each disposed inside the fixed barrel member; a second cam barrel member disposed inside any of the focus cam barrel member, the focus interlocking plate, and the first cam barrel member; a third cam barrel member disposed outside the fixed barrel member; an automatic focusing unit secured to an outer surface of the pedestal barrel member; and an anti-vibration unit disposed inside the pedestal barrel member and at least partially or completely overlapping the automatic focusing unit when the lens barrel assembly takes the position at the wide-angle end.

Abstract: To provide an anti-vibration actuator capable of smooth transition to image-blur prevention control. The present invention is an actuator (10) furnished with a locking mechanism, including: a fixed portion (12); a movable portion (14) with an image-blur prevention lens (16); a movable portion support means (18); a drive means for driving the movable portion; a movable portion locking mechanism (42) for locking a movable portion by limiting the range over which the movable portion can move to be within a predetermined locked movable range; a memory section (36a), within which is stored the movable portion initial position to which the movable portion is moved upon startup of image-blur prevention control; and a control section (36) for moving the movable portion to the initial position and releasing the lock upon startup of control; whereby the predetermined position in the locked movable range is stored as an initial position.

Abstract: The present invention is directed to an imaging lens with an optical system that comprises the foremost lens group closest to an object and of positive refractivity, the succeeding middle lens group, and the rearmost lens group closest to an image plane and of negative refractivity where the middle lens group, having the first, second, and third lens subgroups disposed in series, is moved axially along the optical axis for focusing, and the foremost lens group includes at least three or more convex lens pieces and a single concave lens piece and meets predetermined requirements defined in formulae. The imaging lens has a quality image stabilizing system in which a light-weight lens piece(s) is moved in directions perpendicular to the optical axis.

Abstract: An object of the present invention is to provide an infrared camera capable of shading correction with ease and an improved degree of accuracy and has good maintenance ability. To achieve the object, an infrared camera provided with an infrared lens group and an infrared image sensor located at an image focusing surface of the infrared lens group in a housing in which a window is formed at a portion facing the object side of the infrared lens group comprising: a controller correcting a captured image according to an output from the infrared image sensor and outputting the corrected image; a shutter arranged on an infrared light path in the housing from the window to the infrared lens group; and a temperature sensor detecting the temperature of the shutter is adopted.

Abstract: This invention is directed to provide an infrared camera lens that is simple in lens configuration and has lens pieces including only spherical surfaces but no aspheric surfaces. The invention is also directed to provide an infrared camera lens of a design that facilitates and implements an airtight environment within the lens barrel because the foremost or first lens closest to the object stays still during focusing, and the entire length of the lens system is unchanged for focusing. The infrared camera lens comprises the foremost or first single spherical lens piece of positive refractivity, the succeeding or second single spherical lens piece of negative refractivity, and the third single spherical lens piece of positive refractivity. At least the second single spherical lens piece of negative refractivity or the third single spherical lens piece of positive refractivity is to be moved for focusing.

Abstract: The present invention is an anti-vibration actuator (10) for moving an image stabilizing lens (16), having: a fixed portion (12); a movable portion (14) to which an image stabilizing lens is attached; a movable support member (18) for supporting this movable portion so that it is movable within a plane perpendicular to the optical axis of the image stabilizing lens; drive coils (20) attached to one of either the fixed portion or the movable portion; drive magnets (22) attached to the other of either the fixed portion or the movable portion so as to respectively face these drive coils; and at least one yoke (26) disposed on the side of the drive coils not facing the drive magnets; whereby magnetic force suppressing cutouts (26a) are provided on the yoke in a position overlapping the drive coils in order to suppress magnetic force received from the drive coils.