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Focus detection and tilt regulating method and apparatus using the same

A technology of focusing detection and detection surface, applied in the direction of measuring device, recording/reproducing by optical method, photometric method, etc., can solve the problem of the method of not revealing the image of the imaging element, etc., and achieve the effect of reducing cost

Inactive Publication Date: 2008-09-17
LEADER ELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, there is no disclosure about a method for high-speed processing of images from imaging elements such as CCDs.

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  • Focus detection and tilt regulating method and apparatus using the same
  • Focus detection and tilt regulating method and apparatus using the same
  • Focus detection and tilt regulating method and apparatus using the same

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Embodiment Construction

[0057] Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0058] FIG. 1 is a diagram showing the basic configuration of a focus detection device according to the present invention. As shown in FIG. 1 , what is detected by this focus detection device A is an image on a reference plane (in the figure, a beam spot is represented by a circle, for example). The image can move within a certain, for example, rectangular area. In order to detect the focus of the movable image, the focus detection device A of the present invention includes a detection surface 3 for receiving an image on a reference plane through a projection optical system 2 , a one-dimensional light energy distribution detection unit 4 and a focus state determination unit 5 . Specifically, the detection surface 3 has, for example, a rectangular area corresponding to a certain area of ​​the reference plane 1, and can receive an image tha...

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Abstract

To provide a focus detecting device and a tilt adjustment system that are faster or tolerant of vibration and disturbance during adjustment, or at a lower cost. The focus detecting device is provided with a linear light energy distribution detection part 4 and a focus state judgement part 5. The distribution detection part 4 detects at least one linear light energy distribution of the whole image at an arbitrary position in a prescribed region on a reference surface 1 from a two-dimensional light energy distribution of an image on the reference surface 1. The focus state judgement part 5 judges the focus state of the image on the reference surface 1 on the basis of the detected linear light energy distribution.

Description

technical field [0001] The present invention relates to focus detection in an optical system and its tilt adjustment method and device, in particular, to the focus detection and tilt adjustment of the objective lens of a laser head suitable for use in the drive of optical discs such as CDs and DVDs, etc. Methods and devices. Background technique [0002] Various methods have been known so far as methods for detecting the focus of an optical system or adjusting the tilt of an optical element in an optical system. For example, we have known a method of focusing state detection and angle detection using a semiconductor exposure device by combining an astigmatism method and a two-dimensional CCD (see Patent Document 1). In this method, the focus state is determined by comparing the major axis and the minor axis of the spot diameter generated by the astigmatism method. In this method, in order to detect inclination, it is necessary to make the center of the dot coincide with th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/08G11B7/09G02B7/28
CPCG01J2001/448G11B7/0912G11B7/1374G11B7/1378
Inventor 川村贵史
Owner LEADER ELECTRONICS