JPH0915542A - Light quantity adjustable spectacles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust the transmissivity of light, namely, light quantity by providing a polarizing plate and another polarizing plate opposed to it and constituting at least one of the polarizing plates to be rotatable at the inside of a surface. SOLUTION: A pair of linear polarizing plates 1 and 2 which are mutually separated and are first polarizing plates are fixed and held by a spectacle frame 10 and are provided with the pair of the linear polarizing plates 3 and 4 respectively opposed to the polarizing plates 1 and 2 which are second polarizing plates. The pair of the linear polarizing plates 3 and 4 is supported by the spectacle frame 10, but is made to be movable polarizing plates supported to be respectively freely rotatable at the inside of the surface of the polarizing plate. A rotation transmitting means, for instance, a gear 5 intervenes between the pair of the movable polarizing plates 3 and 4, and transmits the rotation of one movable polarizing plate to another movable polarizing plate. The light quantity incident on left and right eyes is adjusted to be the same at an initial state, and a wearer increases and decreases incident light quality on the left and right eyes only by grasping a knob 6 and rotating the movable polarizing plate 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to spectacles capable of adjusting the amount of light, and more particularly to spectacles for suppressing the amount of light incident on the eyes when observing a bright light source or performing sports such as skiing in experiments.

[0002]

2. Description of the Related Art Conventionally, sunglasses are used to suppress the amount of light incident on the eyes when observing a bright light source or performing sports such as skiing in experiments.
In particular, when it is desired to greatly reduce the amount of incident light, the lens surface of the sunglasses is provided with a reflective coat or the like.

[0003]

However, in the conventional sunglasses provided with the above-described reflective coat, the light transmittance is constant, and this cannot be adjusted. As a result, there is an inconvenience that light is blocked more than necessary and light is transmitted too much.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide eyeglasses capable of adjusting the light transmittance, that is, capable of adjusting the light amount.

[0005]

In order to solve the above-mentioned problems, in the first invention of the present invention, a first polarizing plate and a second polarizing plate facing the first polarizing plate are provided. At least one of a first polarizing plate and a second polarizing plate is configured to be rotatable in its plane, and to provide spectacles capable of adjusting a light amount.

Further, in the second invention of the present invention, a pair of first polarizing plates and a pair of second polarizing plates facing each of the pair of first polarizing plates are provided, and the pair of second polarizing plates is provided. The plate is configured to be rotatable in its plane, and the plate further includes rotation transmission means for transmitting the rotation of one of the pair of second polarizing plates to the other. provide.

According to a preferred aspect of the second invention, at least one of the pair of second polarizing plates is provided with a gripping means for applying a rotational driving force to the polarizing plates.
According to a preferred aspect of the first and second inventions, both the first polarizing plate and the second polarizing plate are linear polarizing plates.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 is a diagram for explaining the operation of the present invention. In the present invention, as shown in FIG. 3, two polarizing plates facing each other, for example, a linear polarizing plate G and a linear polarizing plate H, which are respectively arranged along a plane perpendicular to the optical axis AX, are used in combination. . In FIG. 3, the polarization direction of the linear polarizing plate G is indicated by an arrow F1, and the polarization direction of the linear polarizing plate H is indicated by an arrow F2.

Here, when the polarization directions of the linear polarizing plate G and the linear polarizing plate H intersect at an angle θ in a plane perpendicular to the optical axis AX, the linear polarizing plate G and the linear polarizing plate H are arranged. The light transmittance t in the optical system consisting of is expressed by the following equation (a). t = cos ² θ (a) In this way, by changing θ, in other words, the linearly polarizing plate G and the linearly polarizing plate H are relatively rotationally driven to adjust the light transmittance t. be able to.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view schematically showing a configuration of eyeglasses capable of adjusting a light amount according to an embodiment of the present invention. FIG.
In (a) is a perspective view of the eyeglasses as viewed from the outside,
(B) is a perspective view of the eyeglasses viewed from the eye side of the wearer. FIG. 2 is a diagram showing a holding mechanism and a driving mechanism for the pair of movable polarizing plates in FIG. In FIG. 2, (b) is
It is sectional drawing which followed the line AA of (a).

The spectacles of FIG. 1 comprise a pair of first spaced apart first members.
Linear polarizing plates 1 and 2 are provided as polarizing plates. The pair of linear polarization plates 1 and 2 are fixed polarization plates fixedly held by the spectacle frame 10. The spectacles in FIG. 1 further include linear polarizing plates 3 and 4 as a pair of second polarizing plates facing the pair of fixed polarizing plates 1 and 2, respectively. The pair of linear polarizing plates 3 and 4 are supported by the spectacle frame 10, but are movable polarizing plates rotatably supported in the plane of the polarizing plate.

As shown in FIGS. 1 (a) and 1 (b), the pair of movable polarizing plates 3 and 4 are on the outer side, the pair of fixed polarizing plates 1 and 2 are on the eye side of the wearer, and the spectacle frame is used. Supported by 10. A rotation transmission means such as a gear 5 is interposed between the pair of movable polarizing plates 3 and 4, and the rotation of one movable polarizing plate is transmitted to the other movable polarizing plate. .

That is, as shown in FIG. 2, the gear 5 engages with the teeth formed on the outer periphery of the pair of movable polarizing plates 3 and 4, and the gear 5 and the pair of movable polarizing plates 3 and 4 form the gear. Forming the mechanism. Further, as described above, the pair of movable polarization plates 3 and 4 are rotatably supported by the spectacle frame 10. Therefore, the movable polarizing plates 3 and 4 are interlocked with each other via the gear 5 and are rotated in the same rotation direction by the same angle.

A knob 6 as a gripping means is formed on one of the movable polarizing plates, for example, the movable polarizing plate 4, so that a rotational driving force can be easily applied. Thus, when the glasses of the present embodiment are worn, if the amount of light entering the left and right eyes is adjusted to be approximately the same in the initial state, the wearer holds the knob 6 and the movable polarizing plate 4 The amount of incident light on the left and right eyes can be similarly increased / decreased only by rotating the lens by a predetermined amount.

In the above embodiment, only the linear polarizing plates 3 and 4 are movable polarizing plates, but the linear polarizing plates 1 and 2 may be movable polarizing plates. With this configuration, it is possible to deal with the case where incident light has polarized light. Further, in the above-described embodiments, the example in which the movable polarizing plates 3 and 4 are arranged on the outer side and the fixed polarizing plates 1 and 2 are arranged on the eye side, respectively, but the movable polarizing plates 3 and 4 are arranged on the outer side to the outer side. Fixed polarizing plates 1 and 2
It is obvious that each may be arranged.

Further, in the above embodiment, the gear 5
Although the movable polarizing plates 3 and 4 are configured to rotate in the same rotation direction by the same angle, the gear 5 may be omitted and the movable polarizing plates 3 and 4 may be directly engaged with each other. In this case, the movable polarizing plates 3 and 4 are interlocked so as to rotate in opposite rotation directions by the same angle.

[0017]

As described above, according to the present invention, it is possible to realize eyeglasses capable of adjusting the light transmittance with a simple structure by relatively rotationally driving two facing polarizing plates. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of eyeglasses capable of adjusting a light amount according to an embodiment of the present invention.

FIG. 2 is a diagram showing a holding mechanism and a driving mechanism for a pair of movable polarizing plates in FIG.

FIG. 3 is a perspective view for explaining the operation of the present invention.

[Explanation of symbols]

 1, 2 fixed polarizing plate 3, 4 movable polarizing plate 5 gear 6 knob 10 spectacle frame G, H linear polarizing plate

Claims (4)

[Claims] 1. A first polarizing plate and a second polarizing plate facing the first polarizing plate, wherein at least one of the first polarizing plate and the second polarizing plate is rotatable in its plane. Eyeglasses capable of adjusting the amount of light, which are configured. 2. A pair of first polarizing plates and a pair of second polarizing plates facing each of the pair of first polarizing plates, wherein the pair of second polarizing plates are rotatable within their respective planes. The spectacles capable of adjusting the amount of light, further comprising rotation transmission means for transmitting the rotation of one of the pair of second polarizing plates to the other. 3. The light quantity adjusting device according to claim 2, wherein at least one of the pair of second polarizing plates is formed with a gripping means for applying a rotational driving force to the polarizing plates. Possible glasses. 4. The spectacles according to claim 1, wherein both the first polarizing plate and the second polarizing plate are linear polarizing plates.