Optics: measuring and testing – Lens or reflective image former testing – For optical transfer function
Patent
1997-11-12
1999-10-26
Pham, Hoa Q.
Optics: measuring and testing
Lens or reflective image former testing
For optical transfer function
33200, G01B 900
Patent
active
059737727
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a layout judgment apparatus that judges the layout of a lens to be tested (hereinafter referred to as a subject lens) and a system for the layout judgment apparatus.
2. Description of the Related Art
Progressive power lenses and distance aspheric lenses have become widespread in recent years as eyeglass lenses. With this wide spread, there is a need to appropriately put an eyeglass lens into the lens frame of an eyeglass frame so that the distance visual point and near visual point of a subject fall within the lens frame. For this reason, there is a need to measure the lens characteristics of a subject lens with a lens meter and confirm the distance portion (i.e., farsighted portion) and near portion (i.e., nearsighted portion) of the subject lens.
The aforementioned conventional lens meter, however, merely displays the measured value of each portion measured with a means of measuring. For this reason, there arises the disadvantage that the corresponding relationship between the frame of a subject lens and the distribution state of the lens characteristics of the subject lens, that is, the layout of the lens characteristics of the subject lens to the lens frame, is not known.
SUMMARY OF THE INVENTION
This invention has been made in view of the aforementioned problem, and the object of the invention is to provide a layout judgment apparatus and a layout judgment system which are capable of judging the corresponding relationship between the distribution state of the lens characteristics of a progressive power lens and the lens frame.
This invention is equipped with a measurement means for measuring a lens characteristic of a subject lens and a display section for displaying an image of distribution which shows the measured lens characteristic, in order to achieve the aforementioned object. A lens frame image showing the shape of a lens frame is displayed on the display section.
According to the aforementioned structure of this invention, the lens characteristic of a subject lens is measured by the measurement means, and an image of distribution showing the measured lens characteristic is displayed on the display section. Also, a lens frame image showing the shape of a lens frame is displayed on the display section.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view showing a layout judgment system for a subject lens according to this invention;
FIG. 2 is a block diagram showing a structure of the layout judgment system of FIG. 1;
FIG. 3 is an optical layout diagram showing an optical system of the lens meter;
FIG. 4(A) is a plan view showing a case where the microscopic lens of the micro lens array of FIG. 3 is a circular, spherical convex lens;
FIG. 4(B) is a plan view showing a case where the microscopic lens is a hexagonal, spherical convex lens;
FIG. 4(C) is a plan view showing a case where the microscopic lens is a rectangular, spherical convex lens;
FIG. 4(D) is a plan view showing a case where the microscopic lens is a Fresnel lens;
FIG. 5(A) is an explanatory diagram of light spot images formed on a light receiving sensor in the case where the subject lens has not been set;
FIG. 5(B) is an explanatory diagram of light spot images formed on a light receiving sensor in the case where the subject lens is a positive spherical lens;
FIG. 5(C) is an explanatory diagram of light spot images formed on a light receiving sensor in the case where the subject lens is a negative spherical lens;
FIG. 5(D) is an explanatory diagram of light spot images formed on a light receiving sensor in the case where the subject lens is a lens for astigmatism;
FIG. 5(E) is an explanatory diagram of light spot images formed on a light receiving sensor in the case where the subject lens is a progressive power lens;
FIG. 5(F) is an explanatory diagram of light spot images formed on a light receiving sensor in the case where the subject lens is eccentric and a prism;
FIG. 5(G) is an explanatory diagram of light spot images formed on a
REFERENCES:
patent: 5428448 (1995-06-01), Albert-Garcia
patent: 5825476 (1998-10-01), Abitol et al.
patent: 5844671 (1998-12-01), Kajino et al.
patent: 5847819 (1998-12-01), Yanagi
Supplementary EPO Search Report dated Feb. 17, 1999.
Fukuma Yasufumi
Ikezawa Yukio
Kato Takeyuki
Matsumoto Kouichi
Yanagi Eiichi
Kabushiki Kaisha Topcon
Pham Hoa Q.
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