Fujinon Corporation

Fujifilm Corporation

Naoki Sasaki

Ryota Sasaki

Yasunori Tanaka

Yoshiaki Ishii

Ikuo Taki

Yuya Sakai

Makoto Kobori

The present invention provides an imaging device in which focus movement due to a temperature variation is suppressed and the infiltration of foreign matter such as liquid or dust is prevented. An imaging deviceis provided with an imaging lens, an imaging element, and an intermediate member. The imaging lensis held by a lens-barreland forms an image of a photographic subject. The imaging elementcaptures the image of the photographic subject which is formed by the imaging lens. The intermediate memberhas, on the inner-peripheral-surface of one end thereof, a flange portionwhich comes into contact with the lens-barrel, and holds the lens-barrelby joining the front surfaceof a flange portionof the lens-barreland the surfaceon the imaging elementside of the flange portionto each other.

Imaging device

Among three lenses housed in a lens barrel, a first lens and a second lens are adjacent to each other. A position regulating section is a part where a first protrusion of the first lens is formed. A shielding member is provided at a position interposed between the first lens and the second lens and limits a passing luminous flux. An engagement section is a part of the shielding member, and in this part, there is formed an opening into which the first protrusion of the first lens enters. The engagement section engages with the position regulating section, and thereby the position of the shielding member in a direction crossing an optical axis is regulated.

Lens unit

A lens assembly includes a barrel having an object-side opening and an image-forming-side opening. The barrel further has a positioning section that positions an image-forming-side surface of a lens by having line contact around an optical axis at a center. The positioning section is disposed at a position that is closer to an object side than the image-forming-side opening of the barrel is. The barrel also has an image-forming section that extends from the positioning section to a center of the optical axis along the image-forming-side surface of the lens and forms an edge of the image-forming-side opening of the barrel.

Lens assembly and image-taking apparatus

Taking lenses, andare housed in a lens frame. Then, the O-ringis fitted into a grooveprovided on the periphery of the taking lens, and the taking lensis housed in the lens frame. Subsequently, an anterior surfaceof a lens holderin a screwing direction (directions of arrows P and P') comes into contact with a wall surfaceof the lens frame. Then, the lens holderis gradually screwed into the lens frame. Thereby, a deformable portionof the lens frameon an O-ringside of the wall surfaceis deformed in such a direction (directions of arrows Q and Q&#x2032;) as to press the O-ring

Lens assembly and imaging apparatus

An O-ringis disposed on an image-side second outer peripheral surfacewhich is subjected to a smoothing process, of a taking lensThe O-ringis pressed by an inner surfaceof a lens frametoward the second outer peripheral surface

In the lens assembly, ventilation channels, andpassing between an object-side openingand an image-side openingof a barrelare formed by processing inner surfaces, andof the barreland a surfaceof the barrelThereby, when a taking lensof a first group having an O-ringfitted thereto is mounted into the barrelair in the barrelis pushed out from the image-side openingof the barrelthrough the ventilation channelsand

Areasbeing in contact with an O-ring, of an outer peripheral surface of a taking lensand an area, being in contact with the O-ring, of an inner surface of a lens frameare formed in taper shapes having slopes with respect to an optical axis of the taking lensin a section taken along a plane including the optical axis. The O-ringis disposed in contact with the areasand, which are formed in the taper shapes, of both of the outer peripheral surface of the taking lensand the inner surface of the lens frame. Also, the O-ringis pressed in directions of arrows P and P' by the outer peripheral surface of the taking lensand the inner surface of the lens frame

Growing community of inventors

Saitama, Japan

Naoki Sasaki