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US 5,116,114 AGranted
Ophthalmologic apparatus
AssigneeCanon Kabushiki Kaisha
InventorsYukitsugu Nakamura, Yoshimasa Hamano, Takashi Masuda, Isao Matsumura, Shigeo Maruyama, Kazunobu Kobayashi
Life of this patent
Estimating the term…
Abstract
An ophthalmologic apparatus can measure the eye axis length of an eye to be examined and other information of the eye to be examined (for example, the cornea refractive power). In the case of the measurement of the eye axis length, when moving a detecting terminal itself by driving means, the driving means is controlled so as to slow down the speed of movement of the detecting terminal when the detecting terminal comes near the cornea of the eye to be examined.
Claims15
An ophthalmologic apparatus, comprising:
- (a) a first measuring system for detecting first information of an eye to be examined at a predetermined working distance relative to the cornea of the eye to be examined;
- (b) a second measuring system for detecting second information of the eye to be examined with a detection terminal brought into contact with the cornea of the eye to be examined;
- (c) observation means for observing a positioning alignment state of said detection terminal to the eye to be examined from a moving direction of said detection terminal, said observation means being fixed at least in the moving direction of said detection terminal during the detecting performed using said detection terminal;
- (d) driving means for moving said detection terminal relative to said first measuring system from a position at which said detection terminal is spaced apart from the cornea of the eye to be examined to a position at which said detection terminal contacts the cornea of the eye to be examined without shifting the entire apparatus in the moving direction of said detection terminal;
- and
- (e) driving control means for controlling said driving means so as to slow down at least the speed of movement of said detection terminal when said detection terminal comes near the cornea of the eye to be examined.
3 more elements
An ophthalmologic apparatus, comprising:
- (a) a first measuring system for detecting first information of an eye to be examined at a predetermined working distance relative to the cornea of the eye to be examined;
- (b) a second measuring system for detecting second information of the eye to be examined with a detection terminal brought into contact with the cornea of the eye to be examined;
- (c) observation means for observing a positioning alignment state of said detection terminal to the eye to be examined from a moving direction of said detection terminal, said observation means being fixed at least in the moving direction of said detection terminal during the detecting performed using said detection terminal;
- (d) driving means for moving said detection terminal relative to said first measuring system from a position at which said detection terminal is spaced apart from the cornea of the eye to be examined to a position at which said detection terminal contacts the cornea of the eye to be examined without shifting the entire apparatus in the moving direction of said detection terminal;
- and
- (e) driving control means for controlling said driving means so as to slow down at least the speed of movement of said detection terminal when said detection terminal comes near the cornea of the eye to be examined, wherein said driving means is provided with detecting means for detecting that said detection terminal comes near the cornea of the eye to be examined, and said driving means slows down the speed of movement of said detection terminal in response to detecting that said detection terminal comes near the cornea of the eye to be examines, wherein said driving control means is provided with second detecting means for detecting that said detection terminal comes near the cornea of the eye to be examined, and for producing a signal used as a stop signal to stop said driving means from driving said detection terminal.
3 more elements
An ophthalmologic apparatus, comprising:
- (a) a first measuring system for detecting first information of an eye to be examined at a predetermined working distance relative to the cornea of the eye to be examined;
- (b) a second measuring system for detecting second information of the eye to be examined with a detection terminal brought into contact with the cornea of the eye to be examined;
- (c) observation means for observing a positioning alignment state of said detection terminal to the eye to be examined from a moving direction of said detection terminal, said observation means being fixed at least in the moving direction of said detection terminal during the detecting performed using said detection terminal;
- (d) driving means for moving said detection terminal relative to said first measuring system from a position at which said detection terminal is spaced apart from the cornea of the eye to be examined to a position at which said detection terminal contacts the cornea of the eye to be examined without shifting the entire apparatus in the moving direction of said detection terminal;
- and
- (e) driving control means for controlling said driving means so as to slow down at least the speed of movement of said detection terminal when said detection terminal comes near the cornea of the eye to be examined, wherein said driving means is provided with detecting means for detecting that said detection terminal comes near the cornea of the eye to be examined, and said driving means slows down the speed of movement of said detection terminal in response to detecting that said detection terminal comes near the cornea of the eye to be examined, wherein the position said detecting means is variable in the direction of an optical axis of said apparatus.
3 more elements
An ophthalmologic apparatus, comprising:
- (a) an optical measuring system for detecting information of an eye to be examined, at a predetermined working distance relative to the cornea of the eye to be examined, and for detecting positional alignment of a probe relative to the eye through an optical axis of said optical measuring system;
- (b) an ultrasonic measuring system for detecting dimensional information of the eye with said probe brought into contact with the cornea, said probe being movable on the optical axis of said optical measuring system;
- (c) first driving means for positioning an objective lens unit of said optical measuring system on the optical axis;
- (d) second driving means for moving said probe on the optical axis;
- and p1 (e) mode change instruction means which, at the performance of the ultrasonic measurement, instructs said first driving means to retract said objective lens unit from the optical axis and instructs said second driving means to move said probe into contact with the cornea, wherein said second driving means reduces the speed of said probe near the cornea.
2 more elements
An ophthalmologic apparatus, comprising:
- (a) an optical system for detecting positional alignment of a probe relative to an eye to be examined through an optical axis of said optical system;
- (b) a measuring system for detecting information of the eye with said probe brought into contact with the cornea, said probe being movable on the optical axis of said optical system;
- (c) a first driving means for positioning an objective lens unit of said optical system on the optical axis;
- (d) a second driving means for moving said probe on said optical axis;
- and
- (e) mode change instruction means which at the performance of the measurement by said measuring system instructs causes said first driving means to retract said objective lens unit from the optical axis, and instructs said second driving means to move said probe brought into contact with the cornea, wherein said second driving means reduces the speed of said probe near the cornea.
3 more elements
An ophthalmologic apparatus, comprising:
- (a) an optical system for detecting positional alignment of a probe relative to an eye to be examined through an optical axis of said optical system;
- (b) a measuring system for detecting information of the eye with the probe brought into contact with the cornea of the eye, the probe being movable on the optical axis of said optical system;
- (c) first driving means for positioning said optical system on the optical axis;
- (d) second driving means for moving the probe on the optical axis;
- and
- (e) mode change instruction means, for instructing said first driving means to retract at least one optical element of said optical system from the optical axis, and for instructing said second driving means to reduce the speed of the probe near the cornea so that said measuring system can perform its detecting operation.
3 more elements
Dependencies are inferred from the claim text.