RU2029328C1 - Controlled polarization spectacles - Google Patents

Abstract

FIELD: instrument engineering. SUBSTANCE: spectacles has a pair of polarization filters mounted for rotation. Operation range of angles of rotations at preset admissible values relatively light intensity coefficient which passed through the filters, is chosen from the relation given in the description of the invention. EFFECT: improved precision; improved reliability. 3 cl, 6 dwg

Description

 The invention relates to optical instrumentation, and in particular to devices for controlling light, and can find application in controlled light-protective polarizing glasses.

(1+cos2α) (1) где α - угол между плоскостями поляризации источника и фильтра [1].Known polarizing filter mounted rotatably. The polarized light of the source entering the filter is converted at the output of the filter into a luminous flux whose intensity is proportional
cos ² =

(1 + cos2α) (1) where α is the angle between the planes of polarization of the source and filter [1].

 The disadvantage is the inadequacy of one filter for constructing sun glasses.

 Known light-protective polarizing glasses containing two pairs of polarizing filters superimposed coplanarly on top of each other. In this case, one pair of filters is stationary, and the filters of the other pair rotate indefinitely independently of each other [2].

 The disadvantage of points is the lack of a quantitative assessment of the allowable working range of filter rotation angles and unlimited rotation angles.

 Closest to the proposed solution in terms of technical nature and the achieved result are light-protective polarizing glasses containing two pairs of polarizing filters superimposed coplanarly on top of one another with the possibility of rotation [3].

 The disadvantage of glasses is the quantitative groundlessness of the working ranges of the angle of rotation of the filters and the arrangement of the clutch elements (teeth) around the entire circumference of the filter holders, which complicates the design and manufacture of glasses.

 The aim of the invention is a quantitative justification of the working ranges of angles and simplification of design and manufacture.

[arccos(2K₁-1)]
γ = 90^°-α₂ =

[arccos(1-K₂)] где α₁ , α₂ - граничные значения угла поворота плоскостей поляризации фильтров относительно плоскости поляризации света, входящего в фильтры, и соответствующие значениям К₁; К₂ на краях диапазона θ .The goal is achieved in that the controlled polarizing glasses contain one pair of polarizing filters installed with the possibility of simultaneous rotation, the working range of the rotation angles at specified acceptable values of K ₁ , K ₂ relative intensity factor of the light passing through the filters is selected according to the dependencies
θ = 90 ^° - (β + γ), where β = α _I =

[arccos (2K ₁ -1)]
γ = 90 ^° -α ₂ =

[arccos (1-K ₂ )] where α ₁ , α ₂ are the boundary values of the angle of rotation of the polarization planes of the filters relative to the plane of polarization of the light entering the filters, and corresponding to the values of K ₁ ; K ₂ at the edges of the range θ.

 In addition, in the proposed glasses, one pair of polarizing filters superposed coplanarly on another pair of filters can be fixedly installed, while the working range of angles θ corresponds to the angle α of rotation of the polarization planes of the filters of one pair relative to the polarization planes of the other pair of filters.

In addition, pairs of filters can be installed with the possibility of simultaneous counter rotation of unpaired filters in the right and left halves of the glasses, and the working range θ is chosen according to the dependence
θ = 45 ^° - 0.5 (β + γ).

In FIG. 1 shows the location of the boundary rotation angles α ₁ , α _{2 of the} plane of polarization of the BB filter and the working range of angles θ relative to the plane of polarization AA of the light entering the filter; in FIG. 2 is a graph of the change in relative light intensity K at the output of the filter depending on the angle of rotation α of the plane of polarization of the filter B-B relative to the plane of polarization AA of the light entering the filter; in FIG. 3, 4 - operating ranges of rotation angles of a pair of filter glasses that rotate simultaneously and according to one side, where in FIG. 3 - initial position; in FIG. 4 - after rotation through an angle θ; in FIG. 5, 6 - working ranges of the angles θ of rotation of two pairs of filters with simultaneous oncoming rotation of paired and unpaired filters.

In FIG. 1-6 is indicated:
AA, BB - the plane of polarization of the light entering the filter and the filter;
α ₁ , α ₂ - boundary angles of rotation of the filter;
α ₁ = β; α ₂ = α ₁ + θ = β + θ;
γ = 90 ^o - α ₂ = 90 ^o - (β + θ);
θ - working range of rotation angles θ = 90 ^о - (β + γ);
K is the relative light intensity at the output of the polarizer;
K ₁ , K ₂ - allowable values of intensity at the boundary angles α ₁ , α ₂ .

[arccos(2K₁-1)] (3)
К₂ = 0,5 (1 - cos 2 γ ) (4) или γ =

arccos(1-2K₂) (5)
Устройство работает следующим образом.The relationship between the intensity coefficient K and the angle is determined according to:
K ₁ = 0.5 (1 + cos 2 β) (2) or
β =

[arccos (2K ₁ -1)] (3)
K ₂ = 0.5 (1 - cos 2 γ) (4) or γ =

arccos (1-2K ₂ ) (5)
The device operates as follows.

If the angle between the planes of polarization of the filter and the light entering the filter is equal to α ₁ = β ₁ (Fig. 1), then it corresponds to the coefficient K ₁ , which is less than unity K ₁ <1. The angle α ₂ corresponds to the coefficient K ₂ > 0. Choosing the acceptable values of K ₁ and K ₂ determine the working range of angles θ according to (1) - (5).

 For a pair of filter glasses (Fig. 3, 4), rotating at the same time, the dependencies are saved. Moreover, due to the narrowing of the working range θ, the area on the filter cages containing the clutch elements decreases. This simplifies the design and manufacture of glasses, as well as the operation of managing glasses.

If in glasses containing two pairs of polarizers, the mechanism provides simultaneous counter rotation of unpaired filters in the right and left halves of the glasses, then with the same acceptable values of the coefficients K ₁ , K _{2 the} working range is halved.

 This rotation can be ensured with the oncoming (Fig. 5, 6) or consonant rotation of the paired filters.

 Compared with the prototype, the proposed solution has the following advantages: due to the quantitative justification of the permissible values of the relative coefficient of light intensity at the output of the glasses corresponding to the boundary angles of the working range θ, the range θ narrows, the manufacturing design and the glasses management process are simplified.

 (56) 1. Physical encyclopedic dictionary. M .: Soviet Encyclopedia, 1984, c. 572.

2. US patent N 3838913, class. G 02 C 7/12,
3. British patent N 600213, CL G 02 C 7/12, 1945.

Claims (2)

1. CONTROLLED POLARIZATION GOGGLES, containing at least one pair of polarizing filters, mounted with the possibility of rotation, characterized in that the clutch elements are placed on each rotary filter along an arc characterized by an angle defined by the dependencies
θ = 90 ^° - (β + γ),
where β = α ₁ = 1/2 [arccos (2K ₁ -1)];
γ = 90 ^° -α ₂ = 1/2 [arccos (1-2K ₂ )],
α ₁ , α ₂ - boundary values of the angle of rotation of the plane of polarization;
K ₁ , K ₂ - specified acceptable values of the coefficient of relative light intensity at the output of the glasses, corresponding to the angles α ₁ , α ₂ .
2. Glasses according to claim 1, characterized in that one pair of filters is stationary.  3. Glasses according to claim 1, characterized in that they contain two pairs of filters installed with the possibility of oncoming rotation of unpaired filters.

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