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Variable focal length lens device and control method of variable focal length lens device

A focal length, variable technology, used in lenses, microscopes, instruments, etc., to solve problems such as prolonged time

Pending Publication Date: 2021-04-13
MITUTOYO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in such a method, the time required for obtaining an image with good brightness becomes longer

Method used

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  • Variable focal length lens device and control method of variable focal length lens device
  • Variable focal length lens device and control method of variable focal length lens device
  • Variable focal length lens device and control method of variable focal length lens device

Examples

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Embodiment Construction

[0036] Hereinafter, an embodiment of the present invention will be described based on the drawings.

[0037] [Variable focal length lens unit 1]

[0038] exist figure 1 In this example, the variable focal length lens device 1 detects an image of the surface of the measurement object 9 while changing the focal length.

[0039] To this end, the variable focal length lens device 1 includes: an objective lens 2 and a liquid lens assembly 3 arranged on the same optical axis A intersecting the surface; The image detection unit 4; and the pulse lighting unit 5 for pulse lighting the surface of the object 9 to be measured.

[0040]Furthermore, the variable focal length lens device 1 includes a lens control unit 6 for controlling the operations of the liquid lens unit 3 and the pulse lighting unit 5 , and a control PC 7 for operating the lens control unit 6 .

[0041] The PC 7 for control is constituted by a conventional personal computer, and realizes a desired function by executin...

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Abstract

A variable focal length lens device includes: a variable focal length lens whose focal length Df cyclically changes in accordance with an inputted drive signal Cf; an image detector configured to detect an image of a measurement target through the variable focal length lens; a pulsed light illuminator configured to emit a pulsed light to illuminate the measurement target; and an illumination controller configured to control the pulsed light illuminator so that the pulsed light is emitted twice in one cycle of the drive signal Cf based on two detection phases thetas1, thetas2 corresponding to a designated focal distance Dfs of the variable focal length lens.

Description

technical field [0001] The present invention relates to a variable focal length lens (lens) device and a control method of the variable focal length lens device. Background technique [0002] As a variable focal length lens device, for example, a device using a fundamental liquid lens system (hereinafter sometimes simply referred to as a lens system) described in Document 1 (US Patent Application Publication No. 2010 / 0177376) has been developed. [0003] The liquid lens system is formed by immersing a cylindrical vibrating member made of a piezoelectric material in a transparent liquid. In the liquid lens system, when an AC voltage is applied to the inner peripheral surface and the outer peripheral surface of the vibrating member, the vibrating member expands and contracts in the thickness direction, and the liquid inside the vibrating member vibrates. When the frequency of the applied voltage is adjusted according to the natural vibration number of the liquid, concentric s...

Claims

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Application Information

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IPC IPC(8): G02B3/14
CPCG02B3/14G02B21/02G02B21/06G02B26/004G02B21/241
Inventor 仓桥佑旗
Owner MITUTOYO CORP
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