JP3481979B2 - Binocular magnifier - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a binocular magnifying glass for enlarging an object by wearing it when performing precision work at hand, and in particular, a binocular magnifying lens capable of adjusting the visual field by the difference in the eye width due to individual differences Regarding the mirror.

[0002]

2. Description of the Related Art As a binocular magnifying glass of this type, a technique disclosed in Japanese Patent Publication No. 2-38931 has been known. The binocular magnifying glass described in this publication includes a pair of magnifying optical systems for the right eye and the left eye, each of which has a convex lens and a concave lens arranged in order from the object side. Further, the interval between the convex lenses and the interval between the concave lenses can be adjusted independently, and the interval between the convex lens and the concave lens is also adjustable.

With such a configuration, the magnifying glass described in the above publication makes it possible to provide an unspecified number of lenses by aligning the optical centers of the concave lens and the convex lens with each other on the line connecting the wearer's pupil and the object each time they are worn. It is possible to set according to the eye width and the diopter of the wearer.

[0004]

However, in the above-mentioned conventional binocular magnifying glass, all four lenses must be independently adjusted according to the eye width of the wearer when wearing, and the setting is It has the problem of being complicated. In addition, the diameter of the convex lens is limited to a small value so that each convex lens can be adjusted in the approaching direction when worn by a person with a narrower eye width than the standard, and a wide field of view cannot be obtained.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a binocular magnifying glass capable of setting a visual field according to the eye width of a wearer with a simple operation. To do.

[0006]

In order to achieve the above-mentioned object, a binocular magnifying glass according to the present invention comprises a magnifying optical system constructed by arranging a positive lens group and a negative lens group in order from the object side. , A pair of binocular magnifiers for the right eye and the left eye, the positions of the negative lens groups are made relative to each other in order to match the field of view of each magnifying optical system while keeping the interval between the positive lens groups of each magnifying optical system constant It is characterized in that it has a means for changing it.

[0007]

EXAMPLES Examples of this binocular magnifying glass will be described below.
1 to 5 show an embodiment of the present invention.

First, an outline will be described with reference to FIG. In the following description, the positional relationship will be described with reference to the vertical and horizontal relationships during wearing.

The illustrated binocular magnifier is fixed to the wearer's forehead by a band 1 provided as a holding means. One end of an arm 2 that curves and extends downward is attached to the front surface of the band 1 so as to be vertically movable via a hinge 1a. A T-shaped main frame 10 is fixed to the other end of the arm 2. The main frame 10 holds the positive lens groups 11 and 11 by its lens holding portion 10a, and the negative lens groups 21 and 21 by its base end portion 10b.
It holds two sub-frames 20, 20 for holding.

The sub-frames 20, 20 are supported so as to be movable symmetrically to each other in the left-right direction with respect to the main frame 10, and a lens holding member for holding the negative lens group 21 with respect to the base end portion 20a of the sub-frame 20. The part 20b is configured to be movable in the front-rear direction. As a result, the negative lens groups 21 and 21 can be moved in the left-right direction to be adjusted according to the interpupillary distance, and the movement in the front-back direction can be performed to adjust the diopter according to the wearer's refractive power and working distance. Become.

FIG. 2 is an explanatory view of the adjusting mechanism.
As shown in FIG. 2A, the main frame 10 is provided with a circular rotary knob 12 which is rotatable about a rotary shaft 12a. On the lower surface of the rotary knob 12, pins 12b, 12b projecting downward are provided at axially symmetrical positions.

On the other hand, the base end portion 20a of the sub-frame 20
Is slidably inserted into a through hole formed in a direction crossing the base end portion 10b of the main frame 10,
The pin 12b is sandwiched by the forked portions 20c formed at the tip of a.

With such a structure, when the rotary knob 12 is rotated, the pin 12b moves along an arc, and the forked portion 20c absorbs the longitudinal component of the pin 12b while the circle of the rotary knob 12 is absorbed. The sub-frame 20 is displaced by converting the motion into a linear motion in the left-right direction. Further, since the two pins 12b are provided, the sub-frames on both sides can be moved symmetrically by operating the rotary knob 12 as a common member.

As shown in FIG. 2 (b), the subframe 20 is provided with a rotary knob 22, and a pin 22a is provided on the lower surface of the rotary knob 22 so as to project therefrom. The lens holding portion 20b of the sub-frame 20 is substantially L-shaped as a whole, and the base end portion 20a side thereof is inserted into and retractable from a sliding hole provided in the base end portion 20a. A forked portion 20c is formed at the tip end inserted into the base end of the lens holding portion 20a, and the forked portion 20c holds the pin 22a.

According to this structure, the rotary knob 22
By rotating the lens, the negative lens group 21 can be moved in the front-rear direction to change the relative distance between the negative lens group 21 and the positive lens group 11, and the diopter can be adjusted. Since the rotary knobs 22 are provided independently for each sub-frame, diopter adjustment can be performed separately for the right eye and the left eye.

The positive lens group and the negative lens group are attached so as to be exchangeable, and the magnification can be changed by exchanging the positive lens group alone or by combining the positive lens group and the negative lens group in combination. You can

FIG. 3 is a diagram showing a lens arrangement of the binocular magnifying glass. In this example, the positive lens group 11 and the negative lens group 21 are both composed of an aspherical single lens, and are arranged in the order of positive and negative from the object side, and a pair of Galilean magnifying optical systems for the left eye EL and the right eye ER, respectively. Are configured. In order to suppress the occurrence of chromatic aberration, the Abbe number of the positive lens group is set larger than that of the negative lens group.

In this example, since the interpupillary distance adjustment is performed by moving the negative lens groups 21 and 21 away from each other and approaching each other, the magnifying power is 3 times or less so that the deterioration of the image performance is not felt by this movement. desirable. Moreover, the reason why the aspherical surface is used is that the aberration is favorably corrected by the two single lenses.

Each lens group is preferably a plastic lens in consideration of the ease of processing an aspherical surface and the light weight. Further, in that case, the left and right positive lens groups can be integrally formed.

The positive lens group and the negative lens group of each magnifying optical system are provided so as to be inclined with respect to each other so that their optical axes intersect on the object surface 30 side. In the state shown in FIG. 3, the optical axes of the positive lens group 11 and the negative lens group 21 coincide with each other. In the above-mentioned conventional example, since the optical axes of the lenses of the respective magnifying optical systems are parallel to each other, the left and right optical systems have different image performance states in the peripheral portion. By setting the optical axes to intersect as in the embodiment, the image performance becomes equal in the left and right fields of view, so that a uniform visual field can be secured.

When the eye width of the wearer is PD1, the observation fields of view of the left and right magnifying optical systems on the symmetrical object plane 30 are substantially the same for both eyes. In this setting, when the wearer wears the eye width PD2 (> PD1), the observation areas on the symmetrical object plane 30 do not match with each other as shown in FIG. 4, and the observation becomes difficult.

Therefore, as shown in FIG. 5, the negative lens group 2
By moving 1 and 21 closer to each other, the observation fields of view of both eyes can be made to coincide again. On the contrary, when the eye width of the wearer is smaller than PD1, by moving the negative lens groups so as to separate from each other, the visual fields of both eyes can be matched.

Although the negative lens group is moved on the same straight line in this example, there is almost no difference in operation even if the negative lens group is moved along a direction substantially perpendicular to the optical axis of each magnifying optical system.

When the negative lens group is moved to adjust the interpupillary distance as in this embodiment, the negative lens group is effective in the vertical direction so that the movement does not cause "vignetting" in the negative lens group. It is desirable that the ratio of the horizontal effective diameter to the diameter is larger than the ratio of the horizontal effective diameter to the vertical effective diameter of the positive lens group.

Furthermore, the negative lens group is 30 mm from the wearer's forehead so that it can be worn with the glasses on.
It is desirable to set them so that they are separated from each other by a certain degree or more.

FIG. 6 shows an example in which a prism 40 is inserted between the positive lens group 11 and the negative lens group 21 as means for adjusting the interpupillary distance. It is also possible to adjust the left and right visual field ranges by changing the optical path by inserting a prism in the optical path.

The prism to be inserted may be a prism rotatable about the optical axis, a variable apex angle prism, a prism group in which a plurality of prisms having different apex angles are attached on a rotatable turret.

[0028]

As described above, according to the present invention, it is possible to make adjustments according to the eye width of the wearer without moving the positive lens unit on the object side, and therefore, it is possible to observe a wide range of eyes. It is possible to obtain a field of view.

[Brief description of drawings]

FIG. 1 is a perspective view showing an overall configuration of a binocular magnifying glass according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a drive mechanism portion of the binocular magnifying glass shown in FIG.

FIG. 3 is an explanatory diagram showing a case where the optical axes of the positive and negative lens groups match and the left and right visual fields also match in the apparatus of the embodiment.

FIG. 4 is an explanatory diagram showing a case where a wearer having different eye widths wears the wearer under the setting of FIG. 3;

5 is an explanatory diagram showing a state where the negative lens group is moved and adjusted with respect to the wearer of FIG. 4. FIG.

FIG. 6 is an explanatory view showing an example in which a prism is inserted in an optical path as a modified example of the embodiment.

[Explanation of symbols]

10 ... Mainframe 11 ... Positive lens group 20 ... Subframe 21 ... Negative lens group

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-144413 (JP, A) JP-A-56-126814 (JP, A) Fukukaihei 4-35114 (JP, U) Japanese Patent Publication 2- 38931 (JP, B2) (58) Fields surveyed (Int.Cl. ⁷ , DB name) G02B 23/00 G02B 21/20

Claims (8)

(57) [Claims] 1. A binocular magnifying lens provided with a pair of a positive lens group and a negative lens group arranged in order from the object side for the right eye and the left eye. 2. A binocular magnifying glass having means for relatively changing the position of the negative lens group so as to match the fields of view of the respective magnifying optical systems while keeping the distance between the positive lens groups constant. 2. The binocular magnifying glass according to claim 1, wherein the optical axes of the positive lens groups and the negative lens groups of the magnifying optical systems intersect on the object side. 3. The binocular magnifying glass according to claim 1, wherein the changing means is means for changing the distance between the negative lens groups of the magnifying optical systems. 4. The binocular magnifying apparatus according to claim 3, wherein the means for changing the distance between the both negative lenses has an interlocking mechanism for separating and approaching the negative lens groups on both sides by operating a common member. mirror. 5. The ratio of the horizontal effective diameter to the vertical effective diameter of the negative lens group is greater than the ratio of the horizontal effective diameter to the vertical effective diameter of the positive lens group. The binocular magnifying glass according to claim 3. 6. The binocular magnifying glass according to claim 1, wherein at least the positive lens group in the magnifying optical system is replaceable with a lens group having different powers. 7. The binocular magnifying glass according to claim 1, wherein the magnifying power of each magnifying optical system is 3 times or less. 8. A means for holding the magnifying optical system on a forehead of a wearer, and a horizontal distance between a contact point of the holding means with the forehead and the negative lens group is 30 mm or more. The binocular magnifying glass according to claim 1, characterized in that.