Canon Kabushiki Kaisha

Ken Wada

Atsushi Okuyama

Shuichi Kobayashi

Yoshihisa Tashiro

Kenji Obu

Saburo Sugawara

Arata Sato

Tsunefumi Tanaka

Hiroyuki Hamano

Toyokatsu Fujisaki

Kenji Shinohara

Takashi Okada

In an observation device including a display device, paired ocular optical systems each include a resin lens having a shape defined by an arch and a chord, and provided with a molding gate in an outer peripheral portion of the arc shape, and is appropriately set in: a difference RC between the radius of the resin lens and the length of a line connecting the midpoint of the chord and the point on the optical axis; the diameter D of the resin lens; an angle &#x3b8; between a direction connecting a midpoint of a long side of the display surface and the point on the optical axis and a direction connecting the molding gate and the point on the optical axis; and an acute angle &#x3b1; between directions connecting the point on the optical axis and the respective molding gates of the resin lenses in the paired ocular optical systems.

Observation device

Provided is a compact zoom lens having a high aperture ratio and high optical performance over an entire zoom range. The zoom lens includes, in order from object side to image side: first, second, and third lens units respectively having positive, negative, and positive refractive powers; an aperture stop; a middle lens group; and a final lens unit. An interval between adjacent lens units is changed during zooming. The third lens unit includes at least two positive lenses and at least one negative lens. A combined focal length (f) of first lens unit and second lens unit at telephoto end, a focal length (fn) of a lens unit (N) having a largest absolute value of the negative refractive power of the lens unit forming middle lens group, a focal length (f) of third lens unit, and a focal length (ft) of zoom lens at telephoto end are appropriately set.

Zoom lens and image pickup apparatus including the same

A zoom lens includes a front lens group having a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, an aperture stop, and a rear lens group having a plurality of lens units. The first lens unit is fixed at the time of zooming, the first lens unit includes a first lens subunit having a negative refractive power, which is fixed at the time of focusing and a second lens subunit having a positive refractive power, which moves at the time of focusing. The second lens subunit is arranged at a position adjacent to the first lens subunit on the image side thereof, and the rear lens group includes a lens unit moving in a direction of an optical axis so that an imaging magnification at a telephoto end is larger than an imaging magnification at a wide-angle end.

Zoom lens and image pickup apparatus having the same

The zoom lens includes a front unit including a first positive lens unit and a second positive or negative lens unit, a reflective mirror and a rear unit including two or more lens units. During zooming, the reflective mirror is not moved, and the first lens unit and at least two lens units of the rear unit are moved. When the zoom lens is retracted into a body of an image pickup apparatus, at least one of rotation of the reflective mirror such that a normal line thereto is brought closer to parallel to an optical axis of the rear unit and axial movement thereof in a direction of the optical axis of the rear unit is performed. The front unit is moved into a space formed by the at least one of the rotation and the axial movement. Conditions of 10.5&#x3c;ft/|fn|&#x3c;30.0 and 0.80&#x3c;(Lf&#x2212;L)/Lm&#x3c;1.30 are satisfied.

Zoom lens and image-pickup apparatus including the same

A zoom lens includes a front lens group including a first lens unit and a second lens unit, a reflecting mirror configured to bend an optical path, and a rear lens group including two or more lens units. When the zoom lens is retracted, the reflecting mirror performs at least one of rotation and linear movement to provide space for the front lens group. A focal length of a lens unit having the highest absolute value of refractive power among negative lens units in the front lens group, a focal length of the entire zoom lens at a telephoto end, a maximum value and a minimum value of amounts of movement of the at least two lens units in the rear lens group during zooming, a length of a reflecting surface of the reflecting mirror, and a maximum effective diameter of the first lens unit are appropriately set.

Zoom lens and image pickup apparatus equipped with same

A zoom lens includes, in order from an object side to an image side, a front lens group including a first lens unit having positive refractive power and a second lens unit having refractive power, and a rear lens group including a plurality of lens units. The second lens unit includes a reflective member configured to bend an optical path. At least the first lens unit and at least two lens units of the rear lens group move during zooming. The second lens unit does not move for zooming. A reflection unit including the reflective member moves perpendicularly to an optical axis of the front lens group during retraction. At least part of the front lens group is retractable into a space caused by movement of the reflection unit. A focal length fof the second lens unit and a focal length ft of the entire zoom lens at a telephoto end are appropriately set.

A zoom lens includes, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, and a fourth lens unit having positive refractive power. All of the lens units are moved during zooming from a wide-angle end to a telephoto end. An aperture stop is arranged on the image side of the third lens unit. A distance T23 from a lens surface closest to the image side in the second lens unit to a lens surface closest to the object side in the third lens unit when the zoom lens is at the telephoto end, a focal length fT of the entire zoom lens at the telephoto end, and focal lengths f1, f2, and f3 of the first, second, and third lens units, respectively, are set based on predetermined mathematical conditions.

Zoom lens and image pickup apparatus equipped with zoom lens

An image processing apparatus includes a switching unit to switch images output to the display apparatus, a storage unit to store image specifying information to specify the multiple images to be printed and the number of copies information specifying the number of copies to be printed, and an output unit to sequentially output the images specified with the image specifying information to the display apparatus, are provided, and if a switching operation is performed when the number of copies information is set as two or more copies of an image displayed, output of the next image specified with the image specifying information is performed without following the number of copies information.

Image processing apparatus and image processing method

A zoom lens includes, a plurality of lens units arranged along an optical axis and configured to move from a wide angle end to a telephoto end during a zooming operation of the zoom lens; a first refractive power variable element whose refractive power is changed in a positive direction by changing shapes of boundary surfaces of different media when zooming from the wide-angle end to the telephoto end; and a second refractive power variable element whose refractive power is changed in a negative direction by changing shapes of boundary surfaces of different media when zooming from the wide-angle end to the telephoto end. When zooming from the wide-angle end to the telephoto end, imaging magnifications of the first refractive power variable element and the second refractive power variable element are increased.

Zoom lens and image pickup device including the same

The optical system of the present invention includes a plurality of lens groups and a variable focus lens. Here, the variable focus lens satisfies the following condition:&#x2212;0.023&#x2266;{(&#x2212;1)/&#x3bd;&#x2212;(&#x2212;1)/&#x3bd;}/()&#x2266;0.023

Optical system

A zoom lens includes a first variable refractive power element that changes a refractive power thereof in a positive direction by changing a shape of an interface between different media during zooming from a wide angle end to a telephoto end; and a second variable refractive power element that changes a refractive power thereof in a negative direction by changing a shape of an interface between different media during zooming from a wide angle end to a telephoto end. An imaging magnification of at least one of the variable refractive power elements increases during zooming from the wide angle end to the telephoto end. Variations in chromatic aberration and other distortions are controlled when predetermined conditional expressions are satisfied.

An optical system having a larger total lens length than a focal length includes lenses L and NL on at least one of a magnification conjugate side and a reduction conjugate side with respect to an aperture stop. The lens L satisfies conditional expressions as follows,&#x2212;1.68&#xd7;10&#xb7;&#x3bd;+0.590&#x3c;&#x3b8;&#x3c;3.15&#xd7;10&#xb7;&#x3bd;&#x2212;1.86&#xd7;10&#xb7;&#x3bd;+0.878, and5&#x3c;&#x3bd;&#x3c;27,where &#x3bd;and &#x3b8;are an Abbe number and a gF-line partial dispersion ratio of the lens L. The refractive power of the lens L is positive when located at the magnification conjugate side, or negative when located at the reduction conjugate side.

Optical system and optical apparatus including the same

A zoom lens includes, in order from an object side to an image side, first and second lens units respectively having positive and negative refractive powers, a reflecting prism for bending an optical path, and a rear lens group including lens units. At least the first and second lens units move for zooming. During retraction into a storage state, the prism moves to a position different from a position in an image taking state, and at least a part of the first and second lens units is retracted into a space formed by movement of the prism. Thicknesses of the first and second lens units, a moving amount of the first lens unit during zooming from a wide angle end to a telephoto end, a focal length of the first lens unit, and a focal length of the entire zoom lens at the telephoto end are set properly.

The zoom lens includes, in order from an object side, a first lens unit (positive), a second lens unit (negative), a reflective member and subsequent lens units. A distance between the second and subsequent lens units is reduced during zooming from a wide-angle end to a telephoto end. One of the subsequent lens units includes a non-shift lens unit and a shift lens unit shiftable for image stabilization. The conditions of 1&#x3c;(1&#x2212;&#x3b2;b)&#x3b2;r&#x3c;3 and 0.70&#x3c;Lb/Lp&#x3c;2.00 are satisfied. &#x3b2;b and &#x3b2;r represent lateral magnifications of the shift lens unit and all lens units disposed further on the image side than the shift lens unit when the zoom lens is focused on an infinitely distant object at the telephoto end. Lb represents a distance from an image side surface of the reflective member to an object side lens surface of the shift lens unit. Lp represents a thickness of the reflective member.

Zoom lens and image pickup apparatus with the same

The zoom lens is a retractable bent-type zoom lens capable of providing a high zoom ratio and a reduced thickness, and capable of retracting into a camera body with an easily-configured mechanism. The zoom lens includes in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a prism including a reflective surface, and a posterior lens group which includes plural lens units and has as a whole a positive refractive power. The first and second lens units are retractable into a space formed by movement of the prism in a direction orthogonal to an optical axis of the first lens unit, and, during zooming, the second lens unit and the plural lens units in the posterior lens group are moved while the first lens unit and the prism are fixed.

Growing community of inventors

Sakura, Japan

Ken Wada