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LCD

Laser-scanner-driving-apparatus

Mirror with dazzle light attenuation zone

OF THE APPARATUS OF THE INVENTION FIG. 1 is a cross-sectional view of a multilayered liquid-...

Active matrix LCD device with image signal lines having a multilayered structure

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Catalyst for polyester production, process for producing polyester using the catalyst, polyester obtained by the process, and uses of the polyester

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Image enhancement method and apparatus

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LWIR sensor system with improved clutter rejection

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Optical system

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Method of compensating scattered characteristics of outputs of an infrared detector of multiple-element type

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Optoelectronic multibit beamsteering switching apparatus

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Unitary LCD display holder

The present invention provides for a one-piece or unitary holder for positively locating and ...

Laser scanner driving apparatus

Details

Inventors: Ota, Kazuo;
Assignee: Kabushiki Kaisha Komatsu Seisakusho (Tokyo, JP)
Primary Examiner: Ben; Loha
Assistant Examiner:
Attorney, Agent or Firm: Richards, Medlock & Andrews

A laser scanner driving device has a piezoelectric actuator which acts through a lever to rotate a drive shaft against the force of a plunger which is biased by a reaction spring. The drive shaft is the input to a displacement amplifier. A laser beam deflecting mirror is mounted on the output shaft of the displacement amplifier. In order to reduce the effect of friction on the conversion of the rectilinear displacement of the piezoelectric actuator into the rotational displacement of the mirror and to avoid non-coaxial reaction forces on the piezoelectric actuator, at least one rotatable contactor is provided between the free end of the piezoelectric actuator and the lever and at least one rotatable contactor is provided between one end of the plunger and the lever.

DETAILED DESCRIPTION A laser scanner driving apparatus according to the present invention, wherein a rectilinear displacement of a piezoelectric actuator rotates a lever against a reaction force of a reaction spring and then a displacement amplifier amplifies this rotational displacement to provide a large scanning angle, comprises rotatable contactors between the free end of the piezoelectric actuator and one contact portion of the lever, and between the reaction spring means and another contact portion of the lever.
When the actuator is displaced rectilinearly so that the lever is rotated, only rolling friction occurs between the free end of the actuator and the lever, and between the free end of the reaction spring means and the lever.
Therefore, neither the actuator nor the reaction spring receives a force transverse to the line of action thereof, and thus the loss due to friction on the free end of the actuator can be substantially eliminated.
As a result, the actuator will not break during its operation, and also the positioning precision of a laser scanner driving apparatus can be improved.

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