CN2049780U

CN2049780U - Myopia preventing glasses for reading

Info

Publication number: CN2049780U
Application number: CN 89211171
Authority: CN
Inventors: 胡宁生; 胡之珺; 胡之明; 钟慧玲
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-03-06
Filing date: 1989-03-06
Publication date: 1989-12-20

Abstract

Disclosed is myopia preventing glasses for reading which is an optical instrument, comprising a near distance watch telescope with amplifying function and an adjusting type glasses frame. The front and rear position of objective lens can be adjusted by a user to make the image of the observed written form in the objective lens positioned at the most farther point for an eye can see clearly, and thereby, shortsightedness can be prevented or prevented deepening. The myopia preventing glasses for reading can visibility reduce convergence angle while both eyes watch near objects. The amplifying function of the telescopic contributes to view small fonts clearly. The various regulating function of the plastic glasses frame makes the utility model suited for the wearing and using of a male, a female, an old and a young.

Description

Myopia preventing glasses for reading

The utility model is a kind of reading optical instrument that can have on use, relates to a kind of anti-myopia glasses.

Existingly prevent that the eyeglass of watching of each eye of spectacles from being convex lens.Because when using, the focal length of convex lens is fixed, thereby after user's eyesight (being myopic degree) change, convex lens originally will no longer be suitable for and different convex lens of the adapted number of degrees again, and this is a shortcoming.Another shortcoming of existing anti-myopia glasses is not have amplification, thereby when the not good enough person of eyesight sees small font, can feel difficulty.

The purpose of this utility model is to do the myopia prevention reading spectacles with adjustable telescope optical system, uses to prevent myopia or to prevent the myopia intensification for various eyesight persons.Its enlarging function helps to read small font.

Scheme of the present utility model is as follows: the viewer of myopia prevention reading spectacles is two tool low powers, watches the telescope of low coverage target that they are contained in a kind of adjustment type and can wear on the mirror holder.

Be described further with accompanying drawing in conjunction with the embodiments down.

Accompanying drawing 1 is an optical schematic diagram of the present utility model.

Accompanying drawing 2 is a vertical view of the present utility model.

Accompanying drawing 3 is the sectional view of a lens barrel of the utility model.

Accompanying drawing 4 is the side view of the utility model adjustable nose support mechanism.

Accompanying drawing 5 be the utility model to the L-L among Fig. 4 to cut-open view.

Referring to accompanying drawing 1, optical system of the present utility model is two tool telescopes, and existing is that example illustrates principle of work of the present utility model with the Galileo telescope.Every tool telescope has object lens (1), (1 ') and eyepiece (2), (2 ').The pupil that the user is two is located at G, G ' respectively.First feature of the present utility model is: object lens can be along H, H(or H ', H ') direction of arrow moves focusing respectively, so that the point on objective plane A ' CA is roughly directional light through the light beam that telescope penetrates.When eyes were accepted directional light, the position of the target of being seen just looked like to be positioned at infinite distant place.In whole reading process, the focusing flesh of eyes is in relaxation state always, thereby has eliminated the bathomorphic factor that produces.

Second feature of the present utility model is that two tool telescopes have amplification.Its angular magnification can be selected to the scope of several times 1.2.This amplification is except that the degree of fatigue that helps watching also can alleviate eyes the thin objects and watch the time.

The 3rd feature of the present utility model is the C point (still referring to accompanying drawing 1) that the telescopical optical axis of two tools does not meet at center, target visual field, but makes the A point of left telescopical optical axis by C point the right wittingly, thereby forms offset angle α.Similarly, right telescopical optical axis is by the A ' point on the C point left side.The fundamental purpose of doing like this is to make the convergence angle (it partly is △/2) of watching of common existence be reduced to the part of initial value.Also be target C point after the telescope imaging, light beam E, the F and E ', the F ' that penetrate from two eyepieces have only less angle.Reduce to watch convergence angle that Oculomotor muscle is in than relaxation state, help alleviating the degree of fatigue of eyes.Another purpose of doing like this is to enlarge the visual field in left and right direction.The linear distance of its expansion is A, A '.

Description is asked the method for offset angle α.By accompanying drawing 1, the angle of CB and optical axis ABG is α.If γ is telescopical angular magnification, then the C point after eyepiece penetrates light EF and the angle of optical axis BG will be γ α.The condition of eliminating convergence angle should be γ α

△/2.The offset angle α that need adopt in the time of can obtaining design by last condition △/(2 γ).

The utility model can adopt Galileo telescope, also can adopt the Kepler telescope of band erecting prism group, and the latter can obtain to regulate distance, the amplification of watching image and the function of eliminating convergence angle equally.

Accompanying drawing 2 provides a full implementation example that comprises lens barrel and mirror holder of the present utility model.In accompanying drawing 2, left lens barrel (3) nationality sliding sleeve (4) can be gone up left and right moving to regulate distance between two lens barrels at arc-shaped guide rail (6).After adjusting puts in place, with screw (5) locking.Right lens-barrel also can be done similar adjusting.The banded nose holder of slightly flexible bending (8) is supported by flexure strip.(9) be the part of mirror holder.Screw (10) scalable mirror pin back segment (12) is to the clamping degree of head.The length of nut body (11) scalable mirror pin back segment (12) reaches the corner around axle I, I, thereby changes the angle of pitch that lens barrel is watched.

Lens barrel section when accompanying drawing 3 has been represented the utility model employing Galileo telescope.Between eyepiece (14) and the eyes a suitable distance should be arranged.Object lens (13) are contained in the left lens barrel (3).There are screw thread and scale in the outside of left side lens barrel (3), can make object lens (13) do forward and backward focusing and move, and its position is indicated by scale.

Accompanying drawing 4 is side views of adjustable nose support mechanism.Vertical member in the accompanying drawing 4 (16) can rotate, thereby nose holder (8) is moved along front and rear direction along J, the J direction of arrow around the screw axis (15) that is fixed on the arc-shaped guide rail (6).Horizon bar (18) can be around screw axis (17) along the rotation of K, the K direction of arrow, thus can make nose holder (8) along upper and lower to moving.The two ends of nose holder (8) are porose, can rotate around the end of flexure strip (7) conforming to the gradient of nose (19) just, thereby can alleviate the pressure of nose weight-bearing surface.

Accompanying drawing 5 is that the L-L of accompanying drawing 4 is to cut-open view.Accompanying drawing 5 demonstrates disk spring (20) compressed by nut (21) after, can between horizontal bars (18) and vertical member (16), produce enough big moment of friction, thereby keep the relative angle between two rod members.Similarly, outside screw axis (15), also be with disk spring and nut.

The known main reason that produces myopia is: because eyes are seen nearly thing for a long time, the muscle that eyes are focused just is in contraction state for a long time, loosens function and the maximum distance (being point far away) that enables to see clearly becomes near gradually thereby lose gradually it. The utility model has the advantage of, by the focusing action of telescope object lens, can make and be seen that (for normal eye, this far puts at infinity the point far away that the target accent can be seen clearly at eyes. To myopia, this point far away is in limited distance, usually in 1 meter). At this moment, the eyes focusing muscle relaxation state that can be in that the beholder can reach. That is to say, can not become can only shrink and can not loosen, state that the sort of myopia just has. In addition, telescopical amplification is conducive to see clearly tiny target, also can subtract the degree of fatigue that eyes are clearly watched. And, when adopting the Galileo telescope, can also make the beholder feel that the brightness of target increases to some extent. Above-mentioned two kinds act on and watch convergence angle reduce to prevent myopia or prevent myopia intensification also be useful. During correct the use, the utility model can not produce harmful side effect to eyesight. Adopt day by day the using method that (moon) will watch point far away to transfer fartherly, also possible effective in cure to first trouble myope.

When the utility model is done common reading, desirable about 1.5 times of magnifying power, the visual field that watch this moment is bigger. Be about 10 centimetres. To the amblyope or when doing meticulous watching, magnifying power can be designed to 3 to 5 times. As require the good matter that resembles, the optical system of looking in the distance to adopt object lens and the eyepiece of two gummeds. To the magnifying power below 1.5 times, the pattern of telescopical object lens and eyepiece can be simplified, even can adopt plastic lens with weight reduction and reduce manufacturing cost. Optical system of the present utility model is suitable for normal eye and most myopia or farsightedness, so can also replace the old man to wear the reading glasses of usefulness. Its adjustment type mirror holder has multiple regulatory function, makes one pair of mirror holder can be fit to man, woman, old, the few use. The main in addition part of adjustment type mirror holder is all used the plastics manufacturing, is shaped with the injection moulding method, is easy to batch production.

Claims

1, myopia prevention reading spectacles is made up of left and right lens barrel and mirror holder, it is characterized in that left and right lens barrel is that two tools are suitable for the telescope that low coverage is watched, and its mirror holder is that adjustment type can be worn mirror holder.

2, myopia prevention reading spectacles according to claim 1 is characterized in that being provided with in the telescope and can make the object lens that forward and backward focusing is moved.

3, myopia prevention reading spectacles according to claim 1 is characterized in that the telescopical optical axis of left and right two tools respectively by watching left and right 2 points that separate on the objective plane, and left telescope aims at right point, and right telescope is aimed at left point.

4, myopia prevention reading spectacles according to claim 1 is characterized in that adjustment type can wear the nose restitope of mirror holder and put the rod member that governor motion is an approximate vertical and the rod member of an approximate horizontal.This two rod member can rotate around two transverse axis respectively.

5, myopia prevention reading spectacles according to claim 1 is characterized in that it itself is a slightly flexible bending band that adjustment type can be worn the nose holder of mirror holder, and this bending band can be around the axle rotation of an approximate horizontal.