Fujifilm Corporation

Fujinon Corporation

Yuya Sakai

Ikuo Taki

Yasunori Tanaka

Ryota Sasaki

Shinichiro Fujiki

Ryosuke Nagami

Takeya Abe

Kazuaki Okamori

Keito Kamio

Mitsuhiro Ohno

Naoki Sasaki

A lens unit includes a guided portion that includes a first bearing portion and a second bearing portion disposed to be spaced apart from each other in a direction X and is slidably supported by a guide shaft, and a lens holding member. The lens unit includes a first tilt-preventing member having a linear expansion coefficient lower than a linear expansion coefficient of the lens holding member. The first tilt-preventing member is fixed to a region of the guided portion positioned between the first bearing portion and second bearing portion.

Lens unit and imaging device

A lens unit includes a guided portion that includes a first bearing portion and a second bearing portion disposed to be spaced apart from each other in a direction X and is slidably supported by a guide shaft, and a lens holding member. A first distance between the center of a fixing portion of the lens holding member and the center of the first bearing portion in the direction X is set to be longer than a second distance between the center of the fixing portion and the center of the second bearing portion in the direction X. A first tilt-preventing member having a linear expansion coefficient lower than that of the lens holding member is fixed to a region, which is closer to the first bearing portion than the center of the fixing portion, of a portion of the guided portion positioned between the first and second bearing portions.

Ceramic is molded to produce a molded ceramic product, using a mold that has a portion for forming the trough of a first thread formed on the molded ceramic product. The trough of the first thread is higher than the crest of a second thread formed on a mating component to be engaged with the first thread. Subsequently, the molded ceramic is fired. The trough of the first thread formed on the molded ceramic product thus produced has a depth that allows the trough of the first thread to avoid interference with the crest of the second thread of the mating component.

Method of producing molded ceramic product, molded ceramic product and image-taking apparatus

A lens assembly has: optical members including lenses and spacing rings; and a ceramic lens frame into which the optical members are inserted. A solid lubricant is applied to at least one of a part of the inner peripheral surface of the ceramic lens frame, which part is to be in contact with at least the outer peripheral surfaces of the optical members, and the outer peripheral surfaces of the optical members. Subsequently, the lenses and spacing rings are alternately inserted into the ceramic lens frame and then pressed by a pressing ring.

Lens assembly and method of disposing optical member in ceramic lens frame

A lens assembly made of porous ceramic is provided with concave sections into which an adhesive for fixing lenses inserted into a lens frame is injected. Each of the concave sections has an outward opening and a spacing wall provided between a hollow part of the lens frame and the opening. The adhesive injected into the concave sections passes through multiple pores in the lens frame made of porous ceramic, and reaches the periphery of each of the lenses, thereby fixing the lenses to an inner wall of the hollow part of the lens frame.

Lens frame, lens assembly and image-taking apparatus

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

A lens assembly is provided and includes: a lens frame; and a lens frame having a hollow part into which the lens is inserted. The lens frame has a bonding hole into which an adhesive agent is injected for bonding and fixing to the lens frame the lens inserted into the lens frame and which passes through an outer wall of the lens frame and an inner wall of the hollow part.

Growing community of inventors

Saitama, Japan

Yuya Sakai