New Japan Radio Co., Ltd.

Fumiaki Ohno

Seiji Koike

Kazuhito Fukui

To achieve an opto-reflector in which a distance to a detection target is shortened to be able to detect the position of the closer detection target, and thereby contributing to the reduction of the arrangement space. The opto-reflector () includes a plate-shaped substrate (); a light emitting element () and a light receiving element () mounted on the substrate (); light transmitting resin layer () which seals the light emitting element () and the light receiving element (); and a light shielding portion () provided between the light emitting element () and the light receiving element (). The light shielding portion () is formed at a height such that a part of light beam can be directly transferred between the light emitting element () and the light receiving element () via the light transmitting resin layer ().

Opto-reflector

An object of the present invention is to provide a position detecting device using a reflection type photosensor, which assures a small size and low cost and enables detection of a long distance of about 10 mm or more, and a position detecting method. The position of a moving body is detected by providing, on the moving body, a reflection plate () having reflecting surfaces (sa) and non-reflecting surfaces (sb) arranged alternately in a moving direction of the moving body, providing a light receiving element () of the reflection type photosensor () with, for example, two light receiving portions (and) having different light receiving regions in the moving direction of the moving body, outputting output signals from these two light receiving portions (and), and carrying out at least one calculation of adding, subtracting, dividing and function calculation of these two output signals.

Photosensor for position detecting device, position detecting device using same and position detecting method

There is provided a position detecting device using reflection type photosensors in which a position sensing of lens located not less than 1 mm apart from a sensor can be conducted. A pair of reflection type photosensors PRand PRare oppositely arranged, a double sided reflectorattached on a movable body is movably arranged between the pair of reflection type photosensors and a position of the double sided reflectoris detected from the outputs of these reflection type photosensors. In the position detecting device of the present invention, an operating formula in which linear values are obtained depending on a moving distance of the double sided reflector can be used. For example, when an output of one of the pair of reflection type photosensors is Vo, and an output of the other is Vo, the position detecting is conducted using the operating formula of (Vo&#x2212;Vo)/(Vo+Vo).

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Fujimino, Japan

Fumiaki Ohno