Abstract: Auto focus methods for electronic cameras are disclosed. The method of the present invention obtains and compares evaluation values (high frequency component (HFC)) corresponding to desired image signals from left or right locations relative to a center of a zoom lens of an electronic camera, thereby locating the maximal evaluation value. The location corresponding to the located maximal evaluation value is an optimum focus location.

Abstract: An image forming device for forming an image on an image forming object by irradiating the image forming object with a luminous flux corresponding to the image, the image forming device including: a lens having a zoom lens and a focus lens; a driving system; a position sensor; a controlling circuit; and a memory. When the controlling circuit receives a first command, the controlling circuit sets the target values, controls the driving system using the set target values, and performs control to record the respective positions detected by the position sensor in timing of ending the controlling of the driving system in the memory as a first adjustment value. When the controlling circuit receives a second command to read contents of the memory, the controlling circuit reads the first adjustment value from the memory, and controls the driving system using the first adjustment value as the target values.

Abstract: Digital and optical zoom are combined over a number of discrete digital zoom levels. Digital interpolation is provided during transition periods between the discrete digital zoom levels such that the total apparent zoom level appears continuous and uninterrupted.

Abstract: A digital imaging device automatically detects that a subject is too close to the device for acceptable focus to be achieved and informs the user, takes automatic corrective action, or both.

Abstract: An imaging apparatus includes: a zoom lens system including a plurality of groups and performing variable magnification by changing intervals of the lens groups; a color-separation optical system configured to carry out color separation of a light flux from the zoom lens system; and a plurality of imaging devices configured to convert optical images separated by colors by the color-separation optical system into electric signals. The zoom lens system includes at least one reflection member configured to bend an optical axis by 90 degrees or approximately 90 degrees. The color-separation optical system is arranged such that color-separation is performed in a direction within a plane perpendicular to another plane formed by an optical axis for light incident to the zoom lens system and an optical axis for light reflected by the reflection member.

Abstract: Disclosed herein is an image pickup apparatus, including: image inputting portion configured to capture an image; optical portion configured to adjust a capture magnification; a rotatable table for adjusting a capture angle; storage portion configured to store a displacement amount between the center of a reading region of the image inputting portion and an optical axis of the optical portion; and control portion configured to calculate correction values and carry out angular control of the rotatable table so as to cancel the displacement amount based on the correction amounts.

Abstract: There is provided a zoom lens system, compact and light in weight and having high image formation performance over the zoom entire range irrespective of object lens while covering the range from the broad angle side up to the telescopic end state side, which is used in video camera and/or digital still camera.

Abstract: The invention relates to an imaging system in which, while high image quality is maintained with the influence of diffraction minimized, the quantity of light is controlled, and which enables the length of the zoom lens to be cut down. The imaging system comprises a zoom lens comprising a plurality of lens groups G1 and G2 wherein the spacing between individual lens groups is varied to vary a focal length and an aperture stop located in an optical path for limiting at least an axial light beam diameter, and an electronic image pickup device I located on the image side of the zoom lens. The aperture stop has a fixed shape, and a filter S2 for performing light quantity control by varying transmittance is located on an optical axis of a space located at a position different from that of a space in which the aperture stop is located.

Abstract: A zoom lens system is disclosed which comprises in order from an object side to an image side: a first lens unit with a positive optical power (inverse of the focal length), a second lens unit with a negative optical power; and one or more lens units; and with which at least one of the first lens unit and the second lens unit is moved during zooming. By specifying the optical characteristics (shape, material, focal length, etc.) of the lens elements making up the second lens unit in the zoom lens system, a high zoom ratio is obtained with a simple arrangement, and an optical system, which can adequately accommodate even the use of a solid-state image pickup element with a large number of pixels, is realized.

Abstract: A lens barrel includes an image-capturing optical system having a movable lens and a drive mechanism with a screw member extending along the optical axis direction and being rotated by a motor, a female threaded member moving along the screw member as it revolves. The screw member includes a male screw, and a shaft having an outside diameter equal or less than an inside diameter of a female threaded member, the shaft extending from an end of the male screw, the end being at an opposite direction to a direction in which the engagement section is in abutment with the end of the female threaded member. The female threaded member is disposed such that the female threaded member can move along the male screw and can move from the male screw to a spot on the shaft in abutment with the male screw.

Abstract: A digital camera has an image capturing unit, a display unit, a face portion detecting unit, face portion selecting device and a control unit. The image capturing unit photoelectrically captures an image of a subject including a face portion of the subject and obtains image data of the subject. The display unit displays an image of the subject based on the image data obtained by the image capturing unit. The face portion detecting unit detects face portion of the subject from the image data captured by the image capturing unit. The face portion selecting device selects a face portion detected by the face portion detecting unit as a main subject to which attention is to be paid. The control unit controls the display unit to display a face image of the face portion selected by the face portion selecting device, in enlargement.

Abstract: An electronic imaging apparatus includes a zoom optical system having, in order from the object side, a first lens unit with positive power, a second lens unit with negative power, and an aperture stop, in which the first lens unit is composed of a single positive power unit and the second lens unit has a single negative lens element located at the most object-side position, both surfaces of which are concave, and a positive lens component located at the most image-side position; an electronic image sensor located on the image side of the zoom optical system; and an image processing section electrically processing image data obtained by the electronic image sensor to change the form thereof.

Abstract: The present invention provides a camera system which comprises: a zoom lens; phototaking means converting an image captured by the zoom lens into an electric image signal; and image control means, in which the zoom lens is made up of a first lens group having positive refracting power, a second lens group having negative refracting power, a third lens group having positive refracting power, a fourth lens group having negative refracting power, and a fifth lens group having positive refracting power, which are disposed in this order from an object side, and is configured so that the first lens group, the third lens group, and the fifth lens group are stationary; the second lens group is shifted in an optical axis direction to mainly perform variable power; and the fourth lens group is shifted in the optical axis direction to perform correction for image position fluctuations and focusing.

Abstract: The invention relates to an electronic imaging system such a video camera or digital camera, whose thickness or size is reduced while performance degradation is reduced as much as possible. The system comprises a zoom lens system comprising a first G1, a second G2, a third G3 and a fourth lens group G4 and an aperture stop S, and an electronic image pickup device located on its image side I and covered with a cover glass CG. The image of a subject is formed on the photoreceptive surface of the electronic image pickup device for conversion into electric signals. The system satisfies the following conditions (1) and (2). a?4 ?m??(1) F>a??(2) Here a is the horizontal pixel pitch in ?m of the electronic image pickup device and F is the F-number of the zoom lens system at its wide-angle end.

Abstract: A variable-magnification optical system has, from the object side to the image side, at least a first lens group having a positive optical power, a second lens group having a negative optical power, and a third lens group having a positive optical power. The first lens group includes an optical prism that changes the optical path, and a prescribed conditional formula is fulfilled.

Abstract: An imaging device includes an imaging optical system including at least one movable optical element; an image sensor, an imaging surface of which lies on an image-forming plane of the imaging optical system; a circuit board on which the image sensor is mounted; and an image processing circuit for processing an image signal output from the image sensor and a drive circuit for the movable optical element, both of the image processing circuit and the drive circuit are mounted on the circuit board. The image processing circuit and the drive circuit are disposed on the circuit board in that order from a side closer to the image sensor.

Abstract: To enable to display a scale indicative of a reference length on a screen of a display at an accurate length even when exchanging the lens in an image pickup apparatus to any lens. In a case of mounting an exchange lens (4F, 4Z) to an image pickup apparatus main body (3) and displaying an image of an object picked up by an image sensor (2) and a scale (5) indicative of a reference length in juxtaposition on a screen of a display (6), a previously measured optical magnification or an actual magnification is outputted from optical magnification outputting means (8) provided to the exchange lens (4F, 4Z) is outputted, an actual magnification on the screen of the display (6) is calculated based on the optical magnification, the size for the image sensor and the screen size, and the size of the scale on the screen is set based on the actual magnification and the reference length of the scale by a scale setting means (17).

Abstract: This invention can perform a developing process or editing process, with a high response, for raw image obtained by image sensing by a digital camera or the like. When, therefore, raw image data is input, an extraction area in the raw image data is determined on the basis of the size of an image display area in which a processed image is displayed and a magnification set at this time. A developing process is then performed for partial raw image data in the determined area, and the resultant data is displayed in the image display area.

Abstract: The invention makes a suitable selection from zoom modes and lens elements so thin that the thickness of each lens group can reduced, thereby slimming down a zoom lens with great thoroughness and, hence, an electronic image pickup system. The electronic image pickup system a zoom lens and an electronic image pickup device located on the image plane side of the zoom lens. The zoom lens comprises, in order from the object side, a first lens group G1 comprising two lens components and having generally negative power and a second lens group G2 comprising two lens components and having generally positive power. The focal length of the zoom lens can be varied by varying the air separation between the first lens group G1 and the second lens group G2. The zoom lens should satisfy at least one of conditions (a) to (n).

Abstract: A color image sensor has imaging elements each structured to form, at an image plane, an image of a subject having a respective magnification. Ones of the imaging elements forming respective ones of the images with the same magnification in light of mutually different colors constitute a set characterized by the magnification of the images. The sets having mutually-different magnifications. The color image sensor additionally has a light sensor located in the image plane and comprising a region of sensor elements disposed opposite each of the imaging elements. The regions of sensor elements opposite each of the sets of imaging elements are operable to generate, in response to light incident thereon, a respective color image signal representing the image of the subject at the respective magnification.

Abstract: A collapsible type optical unit is described that is capable of moving its optical system between a working position and a retracted position as well as an image-pickup apparatus including the optical unit. The optical unit and the image-pickup apparatus are capable of acquiring lens-position information by detecting a position of a lens barrel supported to be movable with respect to a fixed barrel. The collapsible type optical unit includes a second group lens frame movable along a direction of its optical axis with respect to a fixed ring and rear barrel, and a solid-state image-pickup device provided behind the second group lens frame, in which on the movable second group lens frame, a position-detecting means for detecting a position of the second group lens frame is provided.

Abstract: The invention makes a suitable selection from zoom modes and lens elements so thin that the thickness of each lens group can reduced, thereby slimming down a zoom lens with great thoroughness and, hence, an electronic image pickup system. The electronic image pickup system a zoom lens and an electronic image pickup device located on the image plane side of the zoom lens. The zoom lens comprises, in order from the object side, a first lens group G1 comprising two lens components and having generally negative power and a second lens group G2 comprising two lens components and having generally positive power. The focal length of the zoom lens can be varied by varying the air separation between the first lens group G1 and the second lens group G2. The zoom lens should satisfy at least one of conditions (a) to (n).

Abstract: An imaging apparatus including a first lens unit with positive power in which the most object-side surface is concave and the most image-side surface is convex, an aperture stop, a second lens unit with positive power in which the most object-side surface is convex and the most image-side surface is concave, and a third lens unit with positive power; and an image sensor. Air spacing between the second lens unit and the third lens unit assumes the shape of a biconvex air lens. The imaging apparatus satisfies the following condition: 1.4?|r 2R|/IH?15.0 where IH is the maximum photographic image height, which is a half of the diagonal length, in an effective imaging area, of the image sensor, and r 2R is the radius of curvature, measured along the optical axis, of the most image-side surface of the second lens unit.

Abstract: The invention relates to an imaging system in which, while high image quality is maintained with the influence of diffraction minimized, the quantity of light is controlled, and which enables the length of the zoom lens to be cut down. The imaging system comprises a zoom lens comprising a plurality of lens groups G1 and G2 wherein the spacing between individual lens groups is varied to vary a focal length and an aperture stop located in an optical path for limiting at least an axial light beam diameter, and an electronic image pickup device I located on the image side of the zoom lens. The aperture stop has a fixed shape, and a filter S2 for performing light quantity control by varying transmittance is located on an optical axis of a space located at a position different from that of a space in which the aperture stop is located.

Abstract: A taking lens apparatus includes a zoom lens system that is composed of a plurality of lens units and that achieves zooming by varying the distances between the lens units and an image sensor that converts the optical image formed by the zoom lens system into an electrical signal. The zoom lens system has, from the object side,: a first lens unit having a negative optical power, a second lens unit disposed on the image side of the first lens unit and having a negative optical power, a third lens unit disposed on the image side of the second lens unit and having a positive optical power, a fourth lens unit disposed on the image side of the third lens unit and having a positive optical power, and a fifth lens unit disposed on the image side of the fourth lens unit and having a positive optical power. During zooming, the first lens unit remains stationary relative to the image sensor, and the second and third lens units move.

Abstract: An imaging system includes a wavelength dependent aperture stop, which transmits light with different ranges of wavelengths through apertures of different diameters. Thus, different colored light will have different F-stops, which can be selected based on the power transfer and image quality requirements for the different colored light. For example, a smaller F-stop may be used with a weaker light source to produce a higher throughput for a specific range of wavelengths. Accordingly, the optical system's design and optimization is wavelength and F-stop dependent.

Abstract: The invention relates to an imaging apparatus that makes effective use of an image restoration processing method, thereby working favorably for size reductions while making sure zoom ratios and brightness, and ensuring good images. The imaging apparatus includes a zoom lens 1 comprising a plurality of lens groups G1 to G4 and adapted to implement zooming from a wide-angle end to a telephoto end with a change in a space between the plurality of lens groups, an imaging device 2 adapted to take an image formed through the zoom lens 1, and an image restoration processor 11 adapted to implement signal processing by which image restoration is implemented on the basis of a signal for the image taken by the imaging device 2 to generate an image signal for a restored image.

Abstract: An electronic camera includes an imager. The imager has an imaging surface to which an optical image of an object scene passing through an optical lens is irradiated. A detector detects a high-frequency component of a partial object scene image belonging to an adjustment area out of the object scene image generated in the imaging surface. A changer changes the distance from the optical lens to the imaging surface step by step. An adjuster adjusts the distance from the optical lens to the imaging surface to an appropriate distance on the basis of the high-frequency component detected by the detector in parallel with the changing processing by the changer. A restarter restarts the changer by changing a size and/or a position of the adjustment area in response to an acceptance of an area changing instruction.

Abstract: A multi-eye camera includes imaging units which are detachably attached to a camera main body. The camera main body has a concave container portion to which at most four imaging units in either vertical or horizontal orientation can be attached at the same time. A length between the optical axes of two imaging units is denoted by a base length R. Attachment positions and orientations of the imaging units can be changed according to a distance from the multi-eye camera to a subject for being captured, so that the length of the base length R is optimized for the subject.

Abstract: An electronic imaging apparatus has a zoom optical system in which the most object-side lens unit A includes one biconcave-shaped negative lens component, each of air-contact-surfaces of which is configured as an aspherical surface, and when the magnification of the zoom optical system is changed in the range from a wide-angle position to a telephoto position, the lens unit A is moved back and forth along the optical axis in such a way that the lens unit A is initially moved toward the image side, and an electronic imaging unit that has an electronic image sensor so that image data picked up by the electronic image sensor are electrically processed and can be output as image data whose format is changed. In this case, in nearly infinite object point focusing, the zoom optical system satisfies the following condition: 0.7<y07/(fw·tan ?07w)<0.94 where y07 is expressed by y07=0.

Abstract: An object of the present invention is to provide a compact size variable power optical system capable of producing a high quality image. The variable power optical system comprises a plurality of lens groups for forming an optical image on an image surface of an image pickup device. Among the plurality of lens groups, the first lens group, which is disposed in the most subject side has a negative refraction power, includes at least a lens having a negative refraction power and a reflective optical element for bending the optical axis. When varying the variable power, the axial distance between the first lens group and the image surface varies. When Nd denotes the refraction power of the lens having negative refraction power at d-line, the refraction power satisfies the conditional formula Nd>1.81.

Abstract: An imaging optical system which is a small-sized and wide angle of view a zoom lens, and whose aberration is finely corrected, is provided. In the imaging optical system, it has the first lens group of negative power, the second lens group of positive power, the third lens group of negative power, the fourth lens group of the positive and the following lens group, and the first lens group is fixed with respect to the image plane during zooming and focusing, and during zooming at least the lens group constituting the following lens group is moved within an adequate range, and the distance between the most image side surface of the following lens group and the image plane is set in an adequate range.

Abstract: A compact bent zooming imaging optical system characterized by sufficient aberration correction. The imagining optical system contains, in order from the object, a first lens group having positive refractive power, a second lens group with negative power which has a reflective optical element for bending the optical axis and lenses on each of the object side and the image side of the reflective optical element, and a following lens group. At least the aforementioned first lens group and following lens group are moved to change in the magnification. ?0.6<?1/?2<?0.15 is satisfied wherein ?1 denotes the refractive power of the first lens group and ?2 indicates the refractive power of the second lens group.

Abstract: A system for selecting a zoom size of an anatomical image for display includes an image detector having a pre-defined field of view defining a maximum and minimum analog zoom fields of view corresponding to maximum and minimum analog zoom settings for at least one anatomical image; an image display displaying the anatomical image within the pre-defined field of view; a processing unit providing a selection of at least one anatomical image; and a network configured to interface the detector with the processing unit and the image display with the processing unit. The system enables establishment of at least one intervening selectable zoom setting corresponding to an intervening selectable zoom field of view between the maximum and minimum analog zoom fields of view, thereby establishing a first user profile. A second user profile overriding the first user profile can be established. A corresponding method is also disclosed.

Abstract: A zoom lens system includes a zoom base to which an image pickup device can be coupled, a driving source for generating rotational force in accordance with a control signal of a control unit disposed in the electronic facility, plural power transmission gears disposed on the zoom base to reduce the rotational force of the driving source, a first lens cam disposed on the zoom base and rotated by the rotational force of the power transmission gears, plural first lens shafts coupled on the zoom base in a direction of an optical axis and located in the first lens cam, a first lens barrel having a first lens, the first lens barrel being disposed in the first lens cam and slidably coupled to the first lens shaft in the direction of the optical axis so as to move in the direction of the optical axis in accordance with rotation of the first lens cam, a power transmission member coupled to the first lens cam in the direction of the optical axis, an outer second lens cam disposed on an outer circumference of the first

Abstract: A zoom lens including front and rear elements, the front elements is set up so that the front elements are disposed at a position to satisfy the formula: T 1 ? Ha 1 + HH 1 + L + HH 2 + f 2 ? ( f 1 - L ) f 1 + f 2 - L + f 1 2 m - f 1 , where a length from the top of the front elements on the optical axis to the front main point of the front elements: Ha1, a main point of the front elements: HH1, a length from the rear main point of the front elements to the front main point of the rear elements: L, a main point of the rear elements: HH2, a focal length of the front elements: f1, a focal length of the rear elements: f2, a length from the object at the time of photography to the front main point of the front elements: m, and a length from the top of the front elements on the optical axis to the imaging plane: T1.

Abstract: There is provided an optical module having a circuit board that includes an imaging element, a lens barrel that is fixed onto the circuit board to movably accommodate a lens holder having a lens that forms an image on an imaging surface of an imaging element in a light axis direction, a cylindrical cam having a cam surface engaged with a protrusion disposed in the outside of the lens barrel and extending from a side face of the lens holder to move the lens holder, and a drive section in which an actuator drives the cylindrical cam via a gear train and also having a cover that integrally covers the lens barrel and the actuator and determines the positional relationship between the lens barrel and the drive section.

Abstract: This invention has as its object to appropriately inform the user of reception of an incoming call in accordance with the operation mode of a video camera upon arrival of call. To achieve this object, an apparatus has a telephone and video camera in a single housing, and comprises a device for muting a ringing tone during image sensing by the video camera.

Abstract: When the camera is performing the pan or tilt operation on performing image blurring correction, the image blurring correction is stopped and a vibration-proof lens is returned to a reference position at a speed that is changed according to a focal length of the zoom lens and is reduced if the zoom lens is set on a wide-side in particular so as to prevent a sense of discomfort due to swingback on the pan or tilt operation. The vibration-proof lens may be kept at a fixed position for a fixed time and returned to the reference position after the fixed time elapses so as to alleviate disorder of an image. The control subject for correcting the image blurring may be returned to the reference position by a predetermined function of which variable is time so as to exert control after stopping the image blurring correction on the pan or tilt operation suitably as intended.

Abstract: The invention makes a suitable selection from zoom modes and lens elements so thin that the thickness of each lens group can reduced, thereby slimming down a zoom lens with great thoroughness and, hence, an electronic image pickup system. The electronic image pickup system a zoom lens and an electronic image pickup device located on the image plane side of the zoom lens. The zoom lens comprises, in order from the object side, a first lens group G1 comprising two lens components and having generally negative power and a second lens group G2 comprising two lens components and having generally positive power. The focal length of the zoom lens can be varied by varying the air separation between the first lens group G1 and the second lens group G2. The zoom lens should satisfy at least one of conditions (a) to (n).

Abstract: A zoom lens having five lens groups arranged in succession. The zoom lens is configured such that when zooming from a short focal length end toward a long focal length end, the second lens group lens moves toward the third lens group and the fourth lens group moves toward a side of the third lens group, and the fifth lens group corrects the zooming and a shift in a position of an imaging plane of the zoom lens caused by movement of the third lens group and the fourth lens group.

Abstract: A zoom lens system is disclosed which includes, in order from an object side to an image side, a first lens unit, a second lens unit, a third lens unit and a fourth lens unit which have a positive, negative, positive and positive optical power, respectively, and at least the first, third and fourth lens units move during zooming so that the distance between the first and second lens units increases, the distance between the second and third lens units decreases and the distance between the third and fourth lens units decreases at the telephoto end compared to the wide-angle end. Then, by appropriately setting lens elements constituting each lens unit and focal lengths of the lens units which move during zooming, the present invention realizes high optical performance over the entire zooming range and entire image area while achieving a desired zoom ratio.

Abstract: A zoom lens system comprising a plurality of lens units each composed of at least one lens element, wherein an interval between at least any two lens units is changed so that an optical image is formed with a continuously variable magnification, the zoom lens system comprises a first lens unit having positive power, a second lens unit that includes a lens element having a reflecting surface and has negative power and subsequent lens units including at least one lens unit having positive power, and the condition: 0.50<(C?S)/H<1.00(C=?{square root over ( )}(2R·dR?dR2), S is a sag of the image side surface of the most object side lens element in the second lens unit at height H, H is one-half of an optical axial thickness of the lens element having a reflecting surface, R is a radius of curvature of the image side surface, and dR is an interval between the most object side lens element and the lens element having a reflecting surface) is satisfied.

Abstract: A digital camera has a first optical system having a wide zoom lens and a second optical system for a telephotography zoom lens. In an initial state where power is active, a controller and timing-generator controls the wide zoom lens so as to be situated at a wide position and the telephotography zoom lens so as to be situated at a telephotograph position. When zoom-in is effected, the wide zoom lens is actuated, and the telephotography zoom lens is maintained at the telephotograph position. When a zoom position of the wide zoom lens has reached a threshold zoom position set to a wider angle of view than that achieved at the telephotograph position, the telephotography zoom lens starts being actuated toward the wide position. When the zoom lens has reached the telephotograph position, an image signal is switched from the wide zoom lens to the telephotography zoom lens, and the selected image signal is output.

Abstract: An image-sensing apparatus has a zoom lens system for forming an optical image of an object with variable magnification, which zoom lens system includes a plurality of lens units and achieves zooming by varying distances between the lens units, and an image sensor for converting the optical image formed by the zoom lens system into an electrical signal. The zoom lens system has, from the object side, a first lens unit that has a positive optical power, includes a reflective member for turning the optical path, and is kept stationary relative to the image sensor during zooming, a second lens unit that is disposed on the image side of the first lens unit and has a negative optical power, an aperture stop that is disposed on the image side of the second lens unit and is kept stationary relative to the image sensor during zooming, and at least one lens unit that is disposed on the image side of the aperture stop and is moved relative to the image sensor during zooming.

Abstract: An image forming device is provided with: a zoom lens system TL that performs magnification varying by changing the distance between the lens units; and an image sensor SR that converts an optical image formed by the zoom lens system TL into an electric signal. The zoom lens system TL includes at least a negative first lens unit GR1 and a positive second lens unit GR2, and at least the first lens unit GR1 and the second lens unit GR2 move in zooming from the wide angle end (W) to the telephoto end (T). The second lens unit GR2 includes three lens elements of, from the object side, a positive meniscus lens element L21 convex to the object side, a negative lens element L22 and a positive lens element L23, and the following condition is satisfied: ?1.0<(CR1?CR2)/(CR1+CR2)<0.0 (CR1 is the front radius of curvature of the most object side lens element L21 in the second lens unit GR2, and CR2 is the rear radius of curvature of the most object side lens element L21 in the second lens unit GR2).

Abstract: There are provided a first lens group having a negative optical power as a whole, second and third lens groups having positive optical powers as a whole, which are located in this order from the object side. These lens groups are all configured to be movable in the optical axis direction during magnification. The first lens group is constituted by a bi-concave lens having a negative optical power and a positive meniscus lens which is convex at the object side thereof, which are located in this order from the object side. The second lens group is constituted by a bi-convex lens having a positive optical power and a bi-concave power having a negative optical power, which are located in this order from the object side and bonded to each other to constitute a cemented lens. The third lens group is constituted by a bi-convex lens having a positive optical power. The first and fifth lenses are double-aspherical lenses formed from resin and the third and fourth lenses are single-aspherical lenses.

Abstract: The invention makes a suitable selection from zoom modes and lens elements so thin that the thickness of each lens group can reduced, thereby slimming down a zoom lens with great thoroughness and, hence, an electronic image pickup system. The electronic image pickup system a zoom lens and an electronic image pickup device located on the image plane side of the zoom lens. The zoom lens comprises, in order from the object side, a first lens group G1 comprising two lens components and having generally negative power and a second lens group G2 comprising two lens components and having generally positive power. The focal length of the zoom lens can be varied by varying the air separation between the first lens group G1 and the second lens group G2. The zoom lens should satisfy at least one of conditions (a) to (n).

Abstract: A zoom lens system for forming an optical image of a subject on the image-sensing surface of an image sensor has three lens units, namely, from the object side thereof, a first lens unit having a negative optical power, a second lens unit having a positive optical power, and a third lens unit having a positive optical power. The lens units each include at least one plastic lens element. The zoom lens system as a whole includes at least one glass lens element that fulfills a prescribed conditional formula.

Abstract: Imaging lens device has a zoom lens system and an image sensor. The zoom lens system has a first reflecting surface, a first movable lens unit, an aperture stop, a second reflecting surface, a second movable lens unit. A first reflecting surface bends a first optical axis which is an incident optical axis of the zoom lens system 90 degrees into a second optical axis. A second reflecting surface bends the second optical axis 90 degrees into a third optical axis. The first optical axis, the second optical axis and the third optical axis are mutually perpendicular. The first movable lens unit and the aperture stop are disposed on the second optical axis. The second movable lens unit is disposed on the third optical axis. During zooming, the first and second reflecting surfaces and the aperture stop are stationary; the first and second movable lens units are moved, respectively.