Asahi Kogaku Kogyo Kabushiki Kaisha

Asahi Kogaku Kabushiki Kaisha

Yutaka Kamijo

Akihiro Arai

Isamu Hirai

Etsuro Nishio

A rotary encoder,comprises a rotary shaft,supported for rotation about its axis AX and a disk,made of an insulating substrate with a conductive pattern,formed on a side surface thereof. The rotary shaft,has a pair of axially-extending, threaded holes,and,formed therein at its one end. The desk,is fixedly secured to the rotary shaft,by means of a pair of set screws,and,threadably engaged into the threaded holes,and,formed in the rotary shaft,such that the disk,is rotatable about a rotational center defined by the axis AX of the rotary shaft,A plurality of electrical contacts,are fixedly mounted on a circuit board,and so arranged as to be in contact with the conductive pattern,depending on the angular position of the disk,such that various combinations of the electrical contacts,may be electrically interconnected one another depending on the angular position of the disk,The threaded holes,and,and the set screws,and,are located off-center with respect to the rotational center of the disk,and along a circle centered to the rotational center of the disk,The conductive pattern,has a central portion,covering the region of the rotational center of the disk,The electrical contacts,include a centered electrical contact,so arranged as to be in contact with the conductive pattern,substantially at the rotational center of the disk,By virtue of the above, the overall size of the rotary encoder,may be minimized while the disk,may be safely secured to the rotary shaft,with reduced possibility of loosening during use.

Rotary encoder having a disk with a conductive pattern

An optical system comprises a pentagonal roof prism and a transparent plate. A rear surface of the pentagonal roof prism is provided with a triangular recessed portion. The wall of the recessed portion is frosted. The transparent plate is a triangular plate, slightly smaller than that of the recessed portion, and is applied to the wall of the recessed portion. The obverse face of the transparent plate is a transparent or polished surface. The transparent plate is applied to the recessed portion with adhesive having photo-transmissibility. It is preferable that the adhesive does not shrink when hardening.

Optical system having composite prism

A prism has a notch at a lower end of a third reflection plane of a pentagonal roof prism. The notch has a frosted wall, on which a transparent plate is adhered with adhesive. A miniature prism is adhered to the transparent plate with adhesive. The adhesive has photo-transmissibility, so that a transparent plane is formed between the pentagonal prism, the transparent plate and the miniature prism. Information displayed by an indication device is directed to an eyepiece optical system, via a mirror and the miniature prism.

Prism

A release switch is directly activated by a self-timer button, and a shutter release button first activates a photometric switch, then the release switch. The self-timer operation is carried out in response to the activation of only the release switch, a photometric operation is carried out in response to the activation of only the photometric switch, and a shutter release operation is carried out in response to the secuential activation of both the photometric switch and the release switch.

Switching device with DX contacts for a camera

A release switch is directly activated by a self-timer button, and a shutter release button first activates a photometric switch, then the release switch. The self-timer operation is carried out in response to the activation of only the release switch, a photometric operation is carried out in response to the activation of only the photometric switch, and a shutter release operation is carried out in response to the sequential activation of both the photometric switch and the release switch.

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Tokyo, Japan

Yutaka Kamijo