Home | Links | Contact Us | More About Intellectual Property | Bookmark

Search patents:

Home

Optical Systems

Optical-instrument-for-measuring-displacement

Optical memory having serially stocked hologram plates

What is claimed is: 1. An optical memory device comprising: means for generating a scanning light ...

Lens testing using total internal reflection holography

I claim: 1. In a process for holographically testing concave and convex surfaces wherein a hologram ...

Composite T-shirt construction

OF THE PREFERRED EMBODIMENT In FIG. 1 can be seen composite clothing article 10 and more ...

Woven endless tire reinforcing belt and method for producing same

In accordance with the present invention, a woven endless tire reinforcing belt is provided ...

Holographic scanner control based on monitored diffraction efficiency

The present invention is an optical scanner in which the actual diffraction efficiency of the ...

Display device for ergonomic sights with a large field of observation

Accordingly, an object of the present invention is to provide a device for the production of ...

Optical position sensor for scanning probe microscopes

Accordingly, it is an object of the invention to provide a scanning probe microscope which is ...

Indication display unit for vehicles

In order to solve the aforementioned existing problems, the present invention suggests an ...

Optical mixer for helmet visual display system

What is claimed is: 1. A visual display system for use in a helmet, comprising: a light intensifier ...

Mirror alignment and/or figure sensing with surface mounted holographic optical elements

FIG. 1 shows, by way of example in the practice of the invention, a telescope 20 comprising a ...

Optical instrument for measuring displacement

Details

Inventors: Taniguchi, Kayoko; Tsuchiya, Hideki; Toyama, Masaaki;
Assignee: Sony Magnescale Incorporation (Tokyo, JP)
Primary Examiner: Willis; Davis L.
Assistant Examiner: Koren; Matthew W.
Attorney, Agent or Firm: Hill, Van Santen, Steadman & Simpson

Optical instrument for measuring displacement comprising a movable diffraction grating used as a scale, a semiconductor laser device, photodetectors, and means for making two light beams diffracted by the diffraction grating interfere with each other in which displacement of said diffraction grating is measured, based on variations of interference signals. The laser device has a suitable coherency for making selectively two necessary light beams with equal optical path lengths interfere with each other.

DETAILED DESCRIPTION This invention has been made in order to take measures against the problems mentiond above and an object of this invention is to provide an optical instrument for measuring displacement, which eliminates the drawbacks of the prior art techiques by detecting a difference between the optical path lengths of the two beams and by adjusting the optical path lengths without any special high precision elements or mechanisms and to make selective light beams interfere with each other.
In order to achieve this object, according to this invention, a suitably coherent multimode semiconductor laser is used as a light source and interference between two light beams diffracted by a diffraction grating is measured.
The invention is described in more detail below using some preferred embodiments.

Related patents

	Diffraction encoded position measuring apparatus In FIG. 1 a laser source supplies a light beam signal on a path or beam labeled 10. This beam is passed through a block 12 labeled AOM for acouso-optic modulator which ...
	Simulated objects What is claimed is: 1. An article comprising a two dimensional reproduction of a surface of an object on a sheet of transparent material, a reflective backing, and a ...
	Telecommunications system for transmitting images The object on which the invention is based consists in setting up a telecommunications system for transmitting images, in particular black-and-white individual images, ...
	Optical waveguide device with phase matching layers It is an object of the present invention to provide an optical waveguide device which, even though the thickness of the device is made very small, produces almost no ...
	Optical arrangement having a concave mirror or concave grating It is an object of the invention to provide the simplest possible correction of astigmatism in concave mirrors and concave gratings, or in the case of holographically ...
	Cassette having an information disc It is an object of the invention to provide a cassette of which does not have the drawbacks of the prior-art cassettes, which combines an optimum rigidity of the housing ...
	Optical systolic array processing I claim: 1. A method for providing a series of analog quantities that are proportional respectively to the components of a third array that is the product of a first ...
	Optical digital matrix multiplication apparatus Another object of this invention is to provide an updatable programmable mask for use in performing digital matrix multiplication using cavityless, optical bistability. S...
	Wide angle line scanner The present invention overcomes the stray radiation, ghost imaging, and narcissus effects of the prior art by incorporating in the system at least two light absorbing ...
	Sample-moving automatic analyzing apparatus An object of the present invention is to eliminate the aforementioned problems and provide a sample.moving sample and apparatus malfunction during irradiation with an ...

0.034
Archive: All patents - Links Copyright (c)2006 Eipa-patents.org - All rights reserved