Asahi Kogaku Kogyo Kabushiki Kaisha

Asahi Kogaku Kogyo K.k.

Asahi Kogaku Kabushiki Kaisha

Asahi Kogaku Kogyo Kaisha

Asahi Kokagu Kogyo Kabushiki Kaisha

Shinsuke Kohmoto

Keisuke Haraguchi

Shigeru Kondoh

Takeo Kobayashi

Norio Numako

Hideki Ohkubo

Saburo Sugawara

Haruo Ishii

Susao Nakamura

Hirofumi Matsuo

Etsuro Nishio

Katsuhiko Nomura

Zenichi Okura

Hiroshi Nomura

Tomoaki Kobayashi

Hiroaki Suzuki

Nobuaki Aoki

Takuji Hamasaki

Yukio Takaoka

Yasuyuki Haneishi

Tetsuya Abe

Hitoshi Tanaka

Takayuki Ito

Takamitsu Sasaki

Isao Soshi

Kazuyoshi Azegami

Norio Sato

Tomoaki Itabashi

Tetsuo Sekiguchi

Tatsuhide Takebayashi

Katsuhiko Nozaki

Zenichi Ohkura

Etsuroh Nishio

Takeo Kabayashi

Tadao Kato

Kazumoto Takakusagi

Hideki Oukubo

A zoom lens for a camera having a between-the-lens shutter includes a motor for moving the lens along an optical axis in forward and rearward directions. A switch is operable by an operator to control operation of the motor for moving the lens from an initial position on the axis to a final stationary position that establishes the focal length of the lens. Control apparatus is responsive to the setting of the switch for operating the motor such that movement of the lens from its initial position to its final position always ends after the lens travels to its final position in a predetermined direction.

Zoom lens drive system for lens shutter type of camera

A lens shutter type of camera is disclosed in which a zoom lens is positioned in a lens block (1) which has a sector gear (15) rotatably associated with the lens block and with a rotatable cam ring (14). The cam ring and sector gear are rotatable in a substantially constant axial position. A movable finder optical assembly (8) and a movable strobe assembly (9) are movable in association with movement of the zoom lens. The zoom lens is movable between an extreme telephoto position and an extreme wide angle position, as well as into a fully collapsed lens position beyond the extreme wide angle position and a macro or close-up photographing position beyond the extreme telephoto position. When the camera is in its macro mode, a prism (P1) is inserted into the finder optical assembly to correct for parallax; the strobe assembly is moved to change its illumination angle; and an optical wedge (4e) is pivoted into the path between a light receiver (4) and a light emitter (3e). A single cam plate (53) is provided to move the finder assembly and the strobe assembly. The photographic aperture (22b) can be selectively closed by barrier plates (31a) when the zoom lens is moved into its fully collapsed position. A light intercepting assembly (210) is provided for preventing light from entering the photographic optical assembly via cam grooves (20 and 21). This intercepting assembly includes a flexible code plate (90) which surrounds a peripheral portion of the cam ring (14) and which provides positional information relating to the position of the zoom lens.

Lens shutter camera including zoom lens

A lens position adjusting apparatus for adjusting an axial position of a rearmost lens group of a plurality of lens groups provided in a focal length variable lens upon assembly of the focal length variable lens is provided. The lens position adjusting apparatus includes a lens frame, a lens frame holder and an engagement tooth array portion. The lens frame holds the rearmost lens group. The lens frame holder engages with the lens frame through a threaded engagement. The engagement tooth array portion is formed along a rear end of the lens frame. The engagement tooth array portion consists of a plurality of engaging teeth. Each of the engaging teeth extends in a direction substantially parallel to an optical axis facing towards a rear of the focal length variable lens.

Apparatus for adjusting lens position in focal length variable lens

A lens shutter type of camera is disclosed in which a zoom lens is positioned in a lens block (1) which has a sector gear (15) rotatably associated with the lens block and with a rotatable cam ring (14). The cam ring and sector gear are rotatable in a substantially constant axial position. A movable finder optical assembly (8) and a movable strobe assembly (9) are movable in association with movement of the zoom lens. The zoom lens is movable between an extreme telephoto position and an extreme wide angle position, as well a into a fully collapsed lens position beyond the extreme wide angle position and a macro or close-up photographing position beyond the extreme telephoto position. When the camera is in its macro mode, a prism (P1) is inserted into the finder optical assembly to correct for parallax; the strobe assembly is moved to change its illumination angle; and an optical wedge (4e) is pivoted into the path between a light receiver (4) and a light emitter (3e). A single cam plate (53) is provided to move the finder assembly and the strobe assembly. The photographic aperture (22b) can be selectively closed by barrier plates (31a) when the zoom lens is moved into its fully collapsed position. A light intercepting assembly (210) is provided for preventing light from entering the photographic optical assembly via cam grooves (20 and 21). This intercepting assembly includes a flexible code plate (90) which surrounds a peripheral portion of the cam ring (14) and which provides positional information relating to the position of the zoom lens.

A zoom lens barrel is provided having a plurality of lens groups which are moved with respect to one another along a predetermined path. The zoom lens barrel comprises a driving barrel which rotates about an optical axis of the plurality of lens groups and at least three telescoping barrels which are moved in the direction of the optical axis by rotation of the driving barrel. Each telescoping barrel which is mounted on an inner periphery of another telescoping barrel of the telescoping barrels, travels a greater distance along the optical axis direction than the another telescoping barrel. A lens group driving mechanism is provided for moving the plurality of lens groups in the optical axis direction by movement of the at least three telescoping barrels in the optical axis direction.

Zoom lens barrel

A zoom lens assembly includes a stationary lens barrel and a rotatable cam ring which is supported on the stationary lens barrel for movement in the direction of the optical axis while being rotated, and which includes at least two cam grooves. The zoom lens include first and third lens groups which are both moveable by one of the two cam grooves in the direction of the optical axis. A second lens group movable, by a second of the two cam grooves in the direction of the optical axis is also provided, as well as a focusing mechanism, for moving the second lens group to a position which is determined by focal length data derived from actual positions of the first, second, and third lens groups and object distance data detected by an object distance measuring device. A method of controlling focusing of the zoom lens includes correcting an amount of deviation from focus caused by a zooming operation, by moving the focusing lens group. The method includes setting a reference object distance, at which no deviation from focus occurs during zooming of the zoom lens, at a finite object distance, such that the amount of movement of the focusing lens group necessary to effect focusing is determined based upon a reference position corresponding to a position of the focusing lens group at the reference object distance, in accordance with focal length data and object distance data.

An apparatus for setting the rotational torque of a screw mechanism including a frictional member which is positioned between a lens frame and a lens frame holder. The frictional member can be made of natural fiber, sponge, rubber, or styrene foam.

Rotational torque setting apparatus for screw mechanism

An apparatus for adjusting the axial position of a lens includes a lens frame which holds the lens, and a lens frame holder which holds the lens frame to allow movement in the optical axis direction. A plurality of split screw engaging portions are provided between the lens frame and the lens frame holder, so that the lens frame and the lens frame holder are capable of being fitted together without rotating and are screw engagable with the split screw engaging portions.

Apparatus for adjusting lens position

Growing community of inventors

Tokyo, Japan

Shinsuke Kohmoto