Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1992-11-04
1994-12-20
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
351158, G02C 100
Patent
active
053748204
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a lens system to be fixed to the head of a user, comprising: magnifier and the second magnifier being attached to a frame, this frame being adapted for being fixed to the head of the user of the lens system; distance measuring means for measuring the distance from the user to an object to be viewed by the user; a control unit connected to the distance measuring means, said distance measuring means providing the control unit with a signal representative of the said distance; driving means connected to the control unit, said control unit providing the driving means with a control signal in response to the signal received from the distance measuring means; and first displacement transferring means connected to the driving means for displacing the first and the second objective with regard to respectively the first and the second ocular in such a manner that the focal length of each magnifier is adapted to the distance measured by said distance measuring means so that the relevant object can be sharply viewed by the user by means of each of said magnifiers.
Such a lens system is known from U.S. Pat. No. 4,865,438. The lens system described therein is intended to always allow the user to automatically have a sharp view of an object to be viewed, regardless of the distance and without requiring manual adjustment of the glasses by the user. An example of a user receiving benefit from such glasses is a surgeon carrying out an operation.
In the following passages the term "adaptation of the focal length of a magnifier to a specific distance" means that the magnifier is adjusted in such a manner that the relevant object can be sharply viewed by the user by means of the magnifier. Preferably, the magnifier is then focussed on said distance, i.e. the focal distance of the magnifier is equalled to the distance of the magnifier to the relevant object. Physically this means that with respect to the associate ocular the objective is adjusted in such a manner that the beams of light reaching the objective leave the magnifier via the ocular in parallel with each other when said beams of light originate from a point remote from the magnifier over the directional distance. This has the advantage that the user can sharply view objects located at the directional distance with an unaccommodated eye, which is less trying than sharply viewing with an accommodated eye. The magnification obtained depends on the power of the employed ocular and the employed objective, respectively.
It is a drawback of the known lens system that the orientation of the magnifiers is constant, as a result of which the known lens system is in principle only suitable for viewing an object at one specific place, said place corresponding to the point of intersection of the optical axes of the two magnifiers. When the object is not located at said point of intersection, i.e. is located closer to or more remote from said point of intersection, the images both magnifiers form of the object are different and the brains must take "trouble" to translate the information presented to both eyes into a single sharp image, which is trying to the user. The more remote the object is from said place, i.e. is located closer to or more remote from said point of intersection, the greater is the extent to which the above phenomenon occurs. Outside a specific margin with respect to said point of intersection, the user will always view two different images overlapping each other.
The object of this invention is to provide a device that does not show these drawbacks. In particular, it is an object of this invention to provide a device with which it is possible to always view objects located at an arbitrary and/or variable distance with respect to the user with an unaccommodated eye in magnified and stereoscopically sharp condition. Since when sharply viewing an object with two eyes the optical axes of the eyes converge toward the object through an inwardly swivelling movement of the eyes, said inwardly swivelling movement of the eyes being larger as th
REFERENCES:
patent: 4195918 (1980-04-01), Freche et al.
patent: 4659922 (1987-04-01), Duncan
patent: 4834525 (1989-05-01), Vansaghi
patent: 4852988 (1989-08-01), Velez et al.
patent: 4929075 (1990-05-01), Eliakim
patent: 5109161 (1992-04-01), Horiuchi et al.
patent: 5200602 (1993-04-01), Ikebe et al.
Allen S. B.
Nelms David C.
Schmidt Optiek B.V.
Skoler George A.
LandOfFree
Lens system with movable magnifiers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Lens system with movable magnifiers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lens system with movable magnifiers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2387480