Ophthalmic apparatus
First Claim
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1. An ophthalmic apparatus, comprising:
- a fogging optical system for eliminating an accommodation power of an eye being examined so as to realize relaxation;
a detecting optical system for detecting information relating to the eye being examined; and
at least one cemented lens, including a positive lens and a negative lens, which, as a whole, has a positive refractive power, said at least one cemented lens forming at least part of a common lens group shared by said fogging optical system and said detecting optical system,satisfying the following conditions;
space="preserve" listing-type="equation">0<
(r2+r1)/(r2-r1)<
0.2;
space="preserve" listing-type="equation">0.05<
1n1-n2<
0.25;
space="preserve" listing-type="equation">15<
σ
1-σ
2<
30wherein r1 is a radius of curvature of a surface of said positive lens other than the cemented surface, r2 is a radius of curvature of a surface of said negative lens, other than the cemented surface, n1 is a refractive index of said positive lens with respect to the d-line, n2 is a refractive index of said negative lens with respect to the d-line, σ
1 is Abbe number if said positive lens, and σ
2 is Abbe number of said negative lens.
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Abstract
An ophthalmic apparatus having a smaller size while guaranteeing a required optical performance from each optical system component is provided. The ophthalmic apparatus includes a fogging optical system for removing an accommodation power of an eye being examined so that the eye is properly relaxed. A detecting optical system is used for detecting information relating to the eye being examined. The fogging optical system and the detecting optical system share a common lens group containing at least one cemented lens. Positive and negative lenses are included in the cemented lens. The common lens group, as a whole, has a positive refractive power.
227 Citations
5 Claims
-
1. An ophthalmic apparatus, comprising:
-
a fogging optical system for eliminating an accommodation power of an eye being examined so as to realize relaxation; a detecting optical system for detecting information relating to the eye being examined; and at least one cemented lens, including a positive lens and a negative lens, which, as a whole, has a positive refractive power, said at least one cemented lens forming at least part of a common lens group shared by said fogging optical system and said detecting optical system, satisfying the following conditions;
space="preserve" listing-type="equation">0<
(r2+r1)/(r2-r1)<
0.2;
space="preserve" listing-type="equation">0.05<
1n1-n2<
0.25;
space="preserve" listing-type="equation">15<
σ
1-σ
2<
30wherein r1 is a radius of curvature of a surface of said positive lens other than the cemented surface, r2 is a radius of curvature of a surface of said negative lens, other than the cemented surface, n1 is a refractive index of said positive lens with respect to the d-line, n2 is a refractive index of said negative lens with respect to the d-line, σ
1 is Abbe number if said positive lens, and σ
2 is Abbe number of said negative lens. - View Dependent Claims (2, 3, 4, 5)
-
Specification