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Actuator, optical scanner and image forming device

A technology of optical scanners and actuators, applied in optics, optical components, electrical recording technology using charge patterns, etc., can solve problems such as changes in optical path length, deviation of the central axis of rotation of mirrors, and inability to exert rotation characteristics

Active Publication Date: 2008-07-16
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the rotation center axis of the mirror is shifted, and the desired rotation characteristics cannot be exhibited.
[0006] Moreover, when the actuator of Japanese Patent Document 1 is used as an optical scanner or the like, the optical path length from the light source to the reflector changes due to the deviation of the rotation center axis of the reflector, so that it cannot be positioned at the desired position of the object. Up-scan reflected light reflected by the mirror
That is, it is difficult to exhibit the desired scanning characteristics

Method used

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  • Actuator, optical scanner and image forming device
  • Actuator, optical scanner and image forming device
  • Actuator, optical scanner and image forming device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0058] First, the first embodiment of the actuator of the present invention will be described.

[0059] Fig. 1 is a perspective view showing the first embodiment of the actuator of the present invention, Fig. 2 is a cross-sectional view of line A-A in Fig. 1, and Fig. 3 is a voltage applied to the piezoelectric element included in the actuator shown in Fig. 1 A schematic diagram of an example of the waveform. In addition, in the following, for convenience of description, the outer side of the paper in FIG. 1 is called "upper", the inner side of the paper is called "lower", the right side is called "right", and the left side is called " Left", and the upper side in FIG. 2 is called "upper", the lower side is called "lower", the right side is called "right", and the left side is called "left".

[0060] The actuator 1 includes: a base body 2 having a two-degree-of-freedom vibration system as shown in FIG. 1 ;

[0061] As shown in FIG. 1 , the base body 2 has a movable plate 21 ...

no. 2 example

[0121] Next, a second embodiment of the actuator of the present invention will be described.

[0122] Fig. 4 is a plan view showing a second embodiment of the actuator of the present invention, and Fig. 5 is a sectional view taken along line B-B in Fig. 4 . In addition, for convenience of explanation, the upper side in FIG. 5 is referred to as "upper", and the lower side is referred to as "lower".

[0123] In the following, description will be made centering on the differences between the actuator 1A of the second embodiment and the actuator 1 of the first embodiment described above, and descriptions of overlapping parts will be omitted.

[0124] The actuator 1A according to the second embodiment of the present invention is substantially the same as the actuator 1 of the first embodiment except that the shapes of the piezoelectric elements 51A to 54A are different. Also, the same reference numerals are attached to the same structures as those of the first embodiment described...

no. 3 example

[0132] Next, a third embodiment of the actuator of the present invention will be described.

[0133] Fig. 6 is a plan view showing a third embodiment of the actuator of the present invention, Fig. 7 is a cross-sectional view of line C-C in Fig. 6 , Fig. 8 is a diagram for explaining a piezoelectric element, and Fig. 9 is a diagram applied to a piezoelectric element A schematic diagram of an example of the voltage. In addition, for convenience of explanation, the upper side in FIG. 7 is referred to as "upper", and the lower side is referred to as "lower".

[0134] In the following, description will be made centering on differences between the actuator 1B of the third embodiment and the actuator 1 of the first embodiment described above, and descriptions of overlapping parts will be omitted.

[0135] The actuator 1B according to the third embodiment of the present invention is substantially the same as the actuator 1 of the first embodiment except for the structure and arrangem...

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PUM

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Abstract

An actuator, includes: a movable plate; a supporter to support the movable plate; a pair of linking portions to link the movable plate and the supporter so as to allow the movable plate to rotate relative to the supporter; and a piezoelectric element to rotate the movable plate. The piezoelectric element elongated and contracted by an energization twists the pair of linking portions to rotate the movable plate, and each of the pair of the linking portions includes an axial member extending from the movable plate and a returned portion that links the axial member and the supporter and is formed so as to return to a side adjacent to the movable plate.

Description

technical field [0001] The invention relates to an actuator, an optical scanner and an image forming device. Background technique [0002] For example, in a laser printer or the like, an optical scanner using an actuator including a torsional vibrator is known as an optical scanner for forming an image by optical scanning (for example, refer to Japanese Patent Document 1). [0003] In Japanese Patent Document 1, an actuator is disclosed, which includes: a reflector; a fixed frame portion for supporting the reflector; and a pair of spring portions connecting the reflector to the fixed frame portion at both sides. Moreover, each of the above-mentioned spring parts includes: a connecting body, which is arranged at a distance from the reflector; a first spring part, which connects the reflector and the connecting body; Connection body and fixed frame part. [0004] The above-mentioned actuator heats up due to, for example, ambient temperature and light emitted to the reflector...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B26/10B41J2/47G03G15/00
Inventor 中村友亮沟口安志
Owner SEIKO EPSON CORP