Seiko Instruments Inc

Hideki Kitajima

Yasuyuki Mitsuoka

Takayuki Kosaka

Susumu Fujita

Haruhiko Hasegawa

Shuzo Sudo

Shigeyuki Masuda

Tamio Nomura

An optical unit is disclosed which is capable of being easily assembled, enabling its optical element to smoothly move, and preventing friction loss from being generated around its nut member. A lens driving apparatus is provided for moving an optical element holder, which supports an optical element having an optical axis and is movable along a guide member, in an extension direction of the optical axis, using a nut integrally provided at the holder, and a lead screw threadedly coupled to the nut to rotate forward and backward by a driving unit. In the lens driving apparatus, the forward or backward rotation of the motor is transmitted to the lead screw via a reduction gear train. The lead screw is installed to be inclinedly movable with respect to the extension direction of the optical axis about threaded coupling portions of a threaded section of the lead screw and the nut.

Optical module and camera module

A coordinate reader comprises a coordinate detector body having at least one excitation line, at least one detection line, an exciting circuit connected to the excitation line for supplying an exciting signal, a signal processing circuit connected to the detection line for receiving an induction signal generated in the detection line and outputting a signal containing amplitude information of the induction signal, and a control circuit for receiving the signal outputted by the signal processing unit and outputting an excitation control signal to the exciting circuit. A coordinate indicator indicates position information obtained from the induction signal induced in the detection line. A phase detecting circuit detects a phase difference between the excitation signal and the induction signal generated in the detection line. By this structure, an induction signal component due to the direct electromagnetic coupling between the excitation line and the detection line is eliminated, the required accuracy in calculation of the coordinates is ensured, and the read invalid region can be further reduced.

Coordinate reader and method of detecting coordinates

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Chiba, Japan

Hideki Kitajima