Abstract: Provided is a lens barrel having, in order from an object side to an image side, a first to a third group lens, the lens barrel including: a fixed frame; a cam frame supported by the fixed frame so as to be rotationally movable in a optical axis direction between a forward and a backward movement ends; and a shutter frame which moves in the optical axis direction in a rotation restricted state, through the rotation of the cam frame, in which: a third group frame is fixed to the shutter frame so that the object side of the third group lens is arranged on an inner peripheral side of the shutter frame; and the second frame is configured so that the image side of the frame is stored on the inner peripheral side of the shutter frame when the cam frame is positioned at the backward movement end.

Abstract: A zoom lens system includes in order from an object side to an image side a first lens unit having a positive refracting power; a second lens unit having a negative refracting power; a third lens unit having a positive refracting power; and a fourth lens unit having a positive refracting power. At the time of zooming from a wide angle end to a telephoto end, each of distances between the first lens unit and the second lens unit, between the second lens unit and the third lens unit, and between the third lens unit and the fourth lens unit is changed, and the first lens unit is moved. The first lens unit includes a lens component having positive refracting power, a total number of lens components included in the first lens unit is one, and the third lens unit includes five lens elements.

Abstract: An image pickup apparatus includes a zoom lens having a first positive lens unit, and a first negative lens unit disposed on an object side of the first positive lens unit. A distance between the first positive lens unit and the first negative lens unit is narrowed at the time of zooming from a wide angle end to a telephoto end. The zoom lens includes an aperture stop disposed between a lens nearest to an image side in the first negative lens unit and a lens nearest to the image side in the first positive lens unit, and a light-amount reducing filter made of a resin material which is disposed on the image side of the lens nearest to the image side in the first positive lens unit, and which can be inserted in an optical path and withdrawn from the optical path. The zoom lens satisfies predetermined conditional expressions.

Abstract: An image pickup apparatus includes a zoom lens having a first positive lens unit, and a first negative lens unit disposed on an object side of the first positive lens unit. A distance between the first positive lens unit and the first negative lens unit is narrowed at the time of zooming from a wide angle end to a telephoto end. The zoom lens includes an aperture stop disposed between a lens nearest to an image side in the first negative lens unit and a lens nearest to the image side in the first positive lens unit, and a light-amount reducing filter made of a resin material which is disposed on the image side of the lens nearest to the image side in the first positive lens unit, and which can be inserted in an optical path and withdrawn from the optical path. The zoom lens satisfies predetermined conditional expressions.

Abstract: A zoom lens includes a negative first lens unit G1 and a positive second lens unit G2. The second lens unit G2 includes first and second cemented lens components that are arranged adjacent to each other. The first and second cemented lens components are each made up of a plurality of lens elements having different refractive indices and different Abbe constants. The image side surface of the first cemented lens component and the object side surface of the second cemented lens component are both concave surfaces.

Abstract: A zoom lens system includes in order from an object side to an image side, a first lens unit G1 having a positive refracting power, a second lens unit G2 having a negative refracting power, a third lens unit G3 having a positive refracting power, and a fourth lens unit G4 having a positive refracting power. At the time of zooming from a wide angle end to a telephoto end, distances between the lens units change. The third lens unit includes a first cemented lens component having a concave image-side surface on the image side, and a second cemented lens component having a concave object-side surface on the object side, which is disposed immediately after the image side of the first cemented lens component. The first cemented lens component includes a positive lens, and a negative lens having a concave image-side surface which is disposed on the image side of the positive lens.

Abstract: Provided is a lens barrel having, in order from an object side to an image side, a first to a third group lens, the lens barrel including: a fixed frame; a cam frame supported by the fixed frame so as to be rotationally movable in a optical axis direction between a forward and a backward movement ends; and a shutter frame which moves in the optical axis direction in a rotation restricted state, through the rotation of the cam frame, in which: a third group frame is fixed to the shutter frame so that the object side of the third group lens is arranged on an inner peripheral side of the shutter frame; and the second frame is configured so that the image side of the frame is stored on the inner peripheral side of the shutter frame when the cam frame is positioned at the backward movement end.

Abstract: A zoom lens includes, in order from the object side, a first lens unit with negative power, a second lens unit with positive power, a third lens unit with positive power, and a fourth lens unit. When the magnification of the zoom lens is changed in the range from a wide-angle position to a telephoto position, spacing between the first lens unit and the second lens unit is narrowed and spacing between the second lens unit and the third lens unit is widened. An aperture stop moved integrally with the second lens unit is interposed between the most image-side lens element of the first lens unit and the most image-side lens element of the second lens unit. The first lens unit has, in order from the object side, a negative lens element and a positive lens element and satisfies the following conditions: 0.15<?1MF/?1MR<1.0 ?3.0<?1PF/?1PR<?1.

Abstract: A zoom lens includes a negative first lens unit G1 and a positive second lens unit G2. The second lens unit G2 includes first and second cemented lens components that are arranged adjacent to each other. The first and second cemented lens components are each made up of a plurality of lens elements having different refractive indices and different Abbe constants. The image side surface of the first cemented lens component and the object side surface of the second cemented lens component are both concave surfaces.

Abstract: A zoom lens system includes in order from an object side to an image side, a first lens unit G1 having a positive refracting power, a second lens unit G2 having a negative refracting power, a third lens unit G3 having a positive refracting power, and a fourth lens unit G4 having a positive refracting power. At the time of zooming from a wide angle end to a telephoto end, distances between the lens units change. The third lens unit includes a first cemented lens component having a concave image-side surface on the image side, and a second cemented lens component having a concave object-side surface on the object side, which is disposed immediately after the image side of the first cemented lens component. The first cemented lens component includes a positive lens, and a negative lens having a concave image-side surface which is disposed on the image side of the positive lens.

Abstract: The invention relates to a zoom lens and an imaging apparatus, and more particularly to a slimmed-down zoom lens well fit for imaging apparatus inclusive of video cameras and digital cameras. The zoom lens comprises, in order from its object side, a first lens group having negative refracting power, a second lens group having positive refracting power, a third lens group having negative refracting power and a fourth lens group having positive refracting power. The first lens group consists of one negative component wherein one negative lens and one positive lens are cemented together. Upon zooming from the wide-angle end to the telephoto end and the second lens group moves toward the object side with a decreasing spacing between the first lens group and the second lens group, a changing spacing between the second lens group and the third lens group and a changing spacing between the third lens group and the fourth lens group.

Abstract: A zoom lens includes, in order from the object side, a first lens unit with negative power, a second lens unit with positive power, a third lens unit with positive power, and a fourth lens unit. When the magnification of the zoom lens is changed in the range from a wide-angle position to a telephoto position, spacing between the first lens unit and the second lens unit is narrowed and spacing between the second lens unit and the third lens unit is widened. An aperture stop moved integrally with the second lens unit is interposed between the most image-side lens element of the first lens unit and the most image-side lens element of the second lens unit. The first lens unit has, in order from the object side, a negative lens element and a positive lens element and satisfies the following conditions: 0.15<?IMF/?IMR<1.0 ?3.0<?IPF/?IPR<?1.

Abstract: The invention relates to a zoom lens and an imaging apparatus, and more particularly to a slimmed-down zoom lens well fit for imaging apparatus inclusive of video cameras and digital cameras. The zoom lens comprises, in order from its object side, a first lens group having negative refracting power, a second lens group having positive refracting power, a third lens group having negative refracting power and a fourth lens group having positive refracting power. The first lens group consists of one negative component wherein one negative lens and one positive lens are cemented together. Upon zooming from the wide-angle end to the telephoto end and the second lens group moves toward the object side with a decreasing spacing between the first lens group and the second lens group, a changing spacing between the second lens group and the third lens group and a changing spacing between the third lens group and the fourth lens group.

Abstract: The invention relates to a zoom lens favorable for offering a tradeoff between slimming down a lens system upon received in an associated lens mount and making sure a small F-number. There is a zoom lens provided, which comprises, in order from its object side, a first lens group G1 having negative refracting power, a second lens group G2 having positive refracting power, and a third lens group G3 having positive refracting power. Upon zooming from a wide-angle end to a telephoto end, the first second and third lens groups G1, G2 and G3 each move along an optical axis while a spacing between the first lens group and the second lens group becomes narrow and a spacing between the second lens group and the third lens group becomes wide. The first lens group G1 comprises one single lens that is a double-concave negative lens or two lenses: a double-concave negative lens and a positive lens. The second lens group G2 comprises two positive lenses and one negative lens.

Abstract: The invention relates to a zoom lens favorable for offering a tradeoff between slimming down a lens system upon received in an associated lens mount and making sure a small F-number. There is a zoom lens provided, which comprises, in order from its object side, a first lens group G1 having negative refracting power, a second lens group G2 having positive refracting power, and a third lens group G3 having positive refracting power. Upon zooming from a wide-angle end to a telephoto end, the first second and third lens groups G1, G2 and G3 each move along an optical axis while a spacing between the first lens group and the second lens group becomes narrow and a spacing between the second lens group and the third lens group becomes wide. The first lens group G1 comprises one single lens that is a double-concave negative lens or two lenses: a double-concave negative lens and a positive lens. The second lens group G2 comprises two positive lenses and one negative lens.

Abstract: A method of performing a control operation on a target apparatus in a network including a step of creating a function information file describing control functions of the target apparatus, a step of forming a control window by gathering control functions stored in the function information file, a step of storing the control window in a performance information file, and a step of performing control operations by retrieving the control window from the performance information file. The method prepares beforehand the function information file that stores information of various functions of the target apparatuses and their platforms. The window for controlling the target apparatuses can be created by cutting and pasting necessary control functions from the function information file to the control window. The control functions created in the window are stored in the performance information file. A function performance unit retrieves a control function to perform the control operation accordingly.

Abstract: An optical head for writing and/or reading information on and/or from an optical record medium such as a magneto-optical record medium including a semiconductor substrate, a semiconductor laser mounted on a surface of the semiconductor substrate for emitting a laser beam, an objective lens for projecting the laser beam onto the optical record medium as a fine spot, a plurality of photodetectors firmed in the surface of the semiconductor substrate, and an optical block arranged on said semiconductor substrate to form an integral unit together with said semiconductor substrate. The optical block includes a hologram for diffracting a return beam reflected by said magneto-optical record medium and a polarization beam splitting plane arranged in substantially parallel with an optical axis of a zero order beam emanating from the hologram for splitting a pupil of the hologram.