Precision focusing mechanism taking linear motor and grating rulers as servo elements

A linear motor and servo element technology, applied in the field of precision focusing, can solve the problems of transmission backlash error, limited installation accuracy, low focusing precision, etc., to eliminate backlash error, improve focus precision, and protect the motor. Effect

Inactive Publication Date: 2012-07-04
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] In order to solve the problems of transmission backlash error, complicated mechanism, limited installation accuracy and low focusing precision in the existing focusing mechanism, the present invention provides a precision focusing mechanism using linear motor and grating scale as servo components

Method used

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  • Precision focusing mechanism taking linear motor and grating rulers as servo elements
  • Precision focusing mechanism taking linear motor and grating rulers as servo elements
  • Precision focusing mechanism taking linear motor and grating rulers as servo elements

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Embodiment Construction

[0013] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0014] The invention adopts a focusing mechanism driven by a linear motor, driven by an anti-backlash nut, and the radial bearing eliminates the stress of the motor lead screw, and adopts a high-precision grating ruler as a feedback element.

[0015] Such as figure 1 As shown, the present invention uses a linear motor and a grating ruler as the precision focusing mechanism of the servo element, including: a fixed lens barrel 1, a moving lens barrel 2, a linear motor 3, a motor fixing seat 4, an anti-backlash nut 5, a connecting ball head 6, Radial bearing 7, bearing gland 8, motor connecting block 9, grating main scale 10, grating sub scale 11, connecting piece 12, grating connecting block 13, photoelectric switch limit mechanism 14, limit plate 15 and grating seat 16; The linear motor 3 is fixed on the fixed lens barrel 1 through the motor fixing seat 4, an...

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Abstract

The invention discloses a precision focusing mechanism taking a linear motor and grating rulers as servo elements, and relates to the field of precision focusing. The precision focusing mechanism comprises a fixed lens barrel (1), a mobile lens barrel (2), the linear motor (3), a motor fixing seat (4), a clearance eliminating nut (5), a connection ball head (6), a radial bearing (7), a bearing gland (8), a motor connection block (9), a master grating ruler (10), a slave grating ruler (11), a connection sheet (12), a grating connection block (13), a photoelectric switch limiting mechanism (14), a limiting sheet (15) and a grating seat (16). The precision focusing mechanism has the beneficial effects that: a backlash error caused by motor screw rod transmission can be eliminated effectively, an error caused by a transmission loop of the conventional displacement sensor is reduced, and the focusing precision is improved; and furthermore, a motor screw rod is not influenced by a bending torque, so that the motor is protected.

Description

technical field [0001] The invention belongs to the technical field of precision focusing, and relates to a precision focusing mechanism using a linear motor and a grating ruler as servo components. Background technique [0002] During the working process of the optical system, the relative distance between the imaging target and the optical system is always changing. According to the Gaussian formula, the image distance of the optical system will also change accordingly. To form a clear image, the distance between the lens and the imaging focal plane must be adjusted at any time as the target distance changes to obtain a clear image. This adjustment process is called focusing. [0003] Focusing is required in general optical lenses, and the traditional focusing mechanism has complex structure and low precision. There are many kinds of focusing structures of traditional optical lenses, such as the structure in which the stepping motor is the driving element and the potentio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B7/04
Inventor 贾庆莲
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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