JPH0949955A - Lens holding frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens holding frame capable of holding an oval lens without shortening the length in the short side direction of the lens. SOLUTION: Ocular frames 31R and 31L consisting of anearly cylindrical member holding the oval ocular in an inside lens chamber are provided with projecting parts 315 bearing the lens surface of the ocular and positioning the ocular in an optical axis direction on both right and left inner periphery sides. Holes 313 and 314 communicating with the inside lens chamber are respectively formed up and down by notching upper and lower surfaces forward from a rear end 317 by almost as much as the thickness. In the case of assembling the ocular, one ocular is allowed to fall from the back side of the frames 31R and 31L and positioned by the rear end face 315 of the projected part 315, and the other ocular is inserted from the hole 313 in the long side direction, rotated by about 90 deg. in the lens chamber, and positioned by the front end face of the projecting part 315.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens holding frame, and more particularly, to a lens holding frame that holds a substantially rectangular lens having a short side and a long side.

[0002]

2. Description of the Related Art In recent years, binoculars and the like have been commercialized in consideration of portability, which are thinned in a thickness direction which is a direction perpendicular to an optical axis direction and a direction perpendicular to an eye width direction.

In order to reduce the thickness of the binoculars in the thickness direction, instead of making the shape of the lens as viewed from the optical axis into a circular shape, an elongated one in the width direction of the eye may be adopted.
As the substantially quadrangular lens having the short side and the long side, for example, a quadrangular lens in which the short side and the long side are formed in a straight line orthogonal to each other, or a pair of opposing short sides are formed in a substantially arc shape. There are oval lenses.

As an example of binoculars using an oval lens among these, for example, Japanese Patent Laid-Open No. 53-83758 discloses a pair of left and right lens barrels having an objective lens and an eyepiece, and a pair of these lens mirrors. In the binoculars having a guide rod for movably supporting the tube in the width direction of the eye, the objective lens and the eyepiece lens are formed in an oval shape, which is devised so as to reduce the thickness of the binoculars. There is.

In such a pair of binoculars, a pair of left and right lens barrels are arranged close to or apart from each other along the guide bar so that the interpupillary distance is adjusted so that the interpupillary distance of the user can be adjusted. This helps eliminate the gap between the left and right fields of view.

In the conventional binoculars as disclosed in the above-mentioned Japanese Patent Laid-Open No. 53-83758, a structure for holding an oval lens by a lens holding frame will be described with reference to FIGS. 16 and 17.

FIG. 16 is a vertical sectional view taken along the optical axis (A) of the eyepiece frame holding the eyepiece lens group of the conventional binoculars, and FIG. 17B is a transverse sectional view perpendicular to the optical axis. It is an exploded perspective view showing an eyepiece frame which holds an eyepiece lens group.

As shown in the figure, the eyepiece frame 31 'is a tubular member having a substantially oval cross section, which has a blindfold portion protruding from the rear end side in the interpupillary direction, and the oval lens 3a from the front side to the rear side. The oval lenses 3b are dropped from the side in the optical axis direction and fitted.

The eyepiece frame 31 'has a receiving portion 315' which determines the positions of the lenses 3a and 3b in the optical axis direction on the inner peripheral surface thereof.
Are projected respectively.

The eyepiece frame 31 'fitted with the lenses 3a and 3b as described above is fixed to the lens frame body 5, and the lens frame body 5 is attached to the main plate 8. To be

An exterior member (not shown) is attached so as to cover the base plate 8 and the lens frame body 5.

[0012]

In the prior art means shown in FIGS. 16 and 17, the total thickness of the binoculars is determined by the eyepiece frame, the lens frame body, the main plate, the exterior member, etc. Even if it is considered to further reduce the thickness with this configuration, it is difficult to make it thinner because the thickness of the exterior member, the main plate, the lens frame body, and the eyepiece frame is about 1 mm or less. is there.

On the other hand, even if an attempt is made to reduce the size of the oval lens by further reducing the length in the short side direction, the visual field may be narrowed and the optical performance may be affected. After all it is difficult.

The present invention has been made in view of the above circumstances, and a lens holding frame capable of holding a substantially rectangular lens having a short side and a long side without reducing the length in the short side direction. Is intended to provide.

[0015]

In order to achieve the above object, the lens holding frame of the present invention according to claim 1 is a lens holding frame for holding a substantially rectangular lens having a short side and a long side, The lens holding frame is formed by cutting out a part of the lens holding frame in the long side direction so that the length in the short side direction is substantially equal to the length in the short side direction of the substantially quadrangular lens and is cut out. The short sides facing each other of the substantially quadrangular lens are held by the missing portions.

According to a second aspect of the present invention, in the lens holding frame of the present invention, the notched portion forms a lens loading opening for inserting the lens from a substantially long side direction thereof. No. 1 described above.

Further, in the lens holding frame of the present invention according to claim 3, the notched portion reaches up to one end of the lens holding frame, whereby the unnotched portion is a pair of arm portions. The structure according to claim 1, wherein

[0018]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 show a first embodiment of the present invention, FIG. 1 is a plan sectional view showing binoculars, and FIG. 2 is an exploded perspective view showing the binoculars.

In these binoculars, the second optical system for the right eye is incorporated in the lens barrel body 5R as the lens barrel portion, and the first optical system for the left eye is incorporated in the lens barrel body 5L as the lens barrel portion. The second optical system for the right eye is configured to have the objective lens 1R, the prism 2R, and the eyepiece lens group 3R in this order from the objective side along the optical axis OR, and similarly, the first optical system for the left eye. The system comprises an objective lens 1L, a prism 2L, and an eyepiece lens group 3L in order from the objective side along the optical axis OL.

The objective lenses 1R and 1L are oval-shaped lenses and are incorporated and held in the objective frames 11R and 11L, respectively, and the objective frames 11R and 11L are
Objective frame axes 111R and 111L extended in the optical axis direction are provided, respectively.

The objective frame shafts 111R and 111L have their front ends in holes 41R and 41L of front plates 4R and 4L which will be described later.
In addition, the rear ends of the holes 51R, 51 of the lens frame bodies 5R, 5L are
It is inserted in L and is positioned so that it can be moved by a certain amount in the optical axis direction.

Further, the objective frames 11R and 11L are provided with the objective frame shafts 111R and 111L by an unillustrated objective spring.
By applying the moment of the surrounding force, the lens frame bodies 5R and 5L are positioned in the rotational direction with which they are applied.

The objective frames 11R and 11L are
It is connected to a focus mechanism (not shown), and is moved in the optical axis direction in conjunction with the focus mechanism to adjust the focus position.

The front plates 4R and 4L are the objective lenses 1
The lens frame bodies 5R and 5 are provided at positions further forward of the R and 1L.
Long holes 42R, 42L fixed to L and through which light enters
And the objective frame shafts 111R and 111L.
Has the holes 41R and 41L into which the front end portions of are inserted.

The prisms 2R and 2L are the lens frame body 5
They are fixed at predetermined positions of R and 5L, respectively.

The eyepiece lens groups 3R and 3L are oval lenses similar to the objective lenses 1R and 1L, and are incorporated in eyepiece frames 31R and 31L, respectively. The eyepiece frames 31R and 31L are mirror frames. It is positioned and fixed to the main bodies 5R and 5L.

The eyepiece frame 31R is provided with a blindfold portion 311R extending in the interpupillary adjustment direction on the outer side of the rear end portion and a blindfold portion 312R on the inner side.

Similarly, the eyepiece frame 31L has a blindfold portion 311L extending in the eye width adjusting direction outside the rear end portion.
However, the blindfold portions 312L are provided so as to project inside.

From the eyepiece frames 31R and 31L, field rings 32R and 32L for restricting the field of view are provided toward the front, respectively.

The lens frame body 5R incorporating the second optical system for the right eye and the lens frame body 5L incorporating the first optical system for the left eye as described above are perpendicular to the optical axes OR and OL. By the long shaft 6 and the short shaft 7 arranged in the interpupillary distance adjustment direction, the long shaft 6 and the short shaft 7 are movably supported in a direction in which they are close to each other or a direction in which they are separated from each other.

That is, holes 52R and 52L into which the long shaft 6 is inserted are formed at the bottoms of the lens frame bodies 5R and 5L.
An elliptical hole 53R into which the short shaft 7 is slidably inserted and a press-fitted and fixed 53L are bored.

By the long shaft 6 and the short shaft 7, the positions of the lens frame bodies 5R and 5L, that is, the right optical axis OR
And the parallelism of the left optical axis OL is determined.

The above-mentioned components are incorporated in the main plate 8. The base plate 8 is formed by vertically arranging walls from four sides on a substantially rectangular plate-like member, and objective windows 82R and 82L through which light is incident on the front side, and eyepiece lens groups 3R and 3 on the rear side.
Eyepiece windows 83R and 83L through which the light emitted from L passes are formed respectively.

A circular hole 86 for attaching a focus adjusting mechanism is formed in the wall portion between the elongated holes 83R and 83L.
An elongated plate member 85 is arranged from the vicinity of the circular hole 86 toward the front. The plate member 85 is formed with an escape recess 851 on which the long shaft 6 is placed.

The long shaft 6 is made up of the lens frame body 5R,
After being inserted through the 5L holes 52R, 52L, they are further fitted into the holes 81R, 81L formed in the wall portion of the main plate 8 for positioning.

In the vicinity of the front end portion of the plate member 85, the convex portion 83 engaged with the short shaft 7 and restricted in the height direction.
Is provided.

A circular hole 84 is formed in a substantially central portion of the bottom surface of the base plate 8 so that an interpupillary knob 9 as a means for changing the distance between the optical axes can be rotatably attached.

The interpupillary knob 9 is rotatably mounted around the shaft hole 92 by inserting a rotary shaft (not shown) into the shaft hole 92, and further, is projected from the bottom surface of the lens frame body 5R. A cam groove 91R engaged with a cam follower (not shown) and a 91L engaged with a cam follower (not shown) protruding from the bottom surface of the lens frame body 5L are formed.

An urging means (not shown) is attached to the main plate 8, and the rotation of the lens frame bodies 5R and 5L is restricted by applying the lens frame body 5R to the short shaft 7. There is.

After assembling the lens frame bodies 5R and 5L into the main plate 8, in order to secure the housing strength of the lens frame bodies 5R and 5L, the upper portions of the objective frames 11R and 11L and the prisms 2R and 2L are to be secured. And a lid 10R made of a rectangular plate-shaped member so as to cover a part of the upper portions of the eyepiece frames 31R, 31L,
10L is attached to the lens frame bodies 5R and 5L (see FIG. 4).

An exterior member (not shown) is attached to the base plate 8.

Next, referring to FIGS. 3 to 5, the eyepiece frame 3
1R and 31L will be described in detail. 3 is a perspective view showing the eyepiece frame, FIG. 4 is a vertical sectional view taken along the optical axis showing the eyepiece frame, and FIG. 5 is a plan sectional view taken along the optical axis showing the eyepiece frame.

More specifically, the eyepiece lens groups 3R and 3L are oval-shaped eyepieces 3R arranged on the front side.
a, 3La, and oval lenses 3Rb, 3Lb, which are also oval-shaped and arranged on the rear side.

The eyepiece frames 31R and 31L are substantially oval cylindrical members having a shape that covers the eyepiece lens groups 3R and 3L made of oval lenses, and the inside thereof is a lens chamber.

The eyepiece frames 31R and 31L are provided at the rear end portion 31.
Blindfolds 311R, 312R in the width direction from both sides of 7
And 311L, 312L are extended, and these blindfold portions 311R, 312R, 311L, 312L serve to hide the internal structure of the binoculars so as not to be seen from the outside when performing the interpupillary adjustment.

The eyepiece frames 31R and 31L are provided at the rear end portion 31.
The upper and lower surfaces are notched to the front from 7 by a thickness, and holes 313 and 314 communicating with the internal lens chamber are formed in the upper and lower sides, respectively. These holes 313, 31
On the front end side of 4, the left side cylinder surface and the right side cylinder surface are connected by the connecting portion 316, and again formed into an oval tube.

The lengths of the holes 313 and 314 in the interpupillary adjustment direction are formed to be slightly longer than the lengths of the eyepieces 3Ra and 3La in the short side direction, and these eyepieces 3R are formed.
a and 3La can be inserted through the holes 313 and 314.

The left and right inner peripheries of the eyepiece frames 31R and 31L receive the rear convex surfaces of the eyepiece lenses 3Ra and 3La, and the front convex surfaces of the eyepiece lenses 3Rb and 3Lb. A convex portion 315 for positioning in the axes OR and OL is provided.

Next, a method for incorporating the eyepiece lens groups 3R and 3L into the eyepiece frames 31R and 31L will be described.

First, the eyepieces 3Ra and 3La are shown in FIG.
As shown in, the long side direction is oriented in the direction perpendicular to the eye width direction, and the lens is inserted from the hole 313 in the direction of arrow A until the center of the lens coincides with the centers of the eyepiece frames 31R and 31L.

When the centers of the eyepieces 3Ra and 3La coincide with the centers of the eyepiece frames 31R and 31L, the eyepieces 3Ra and 3La are then rotated about the optical axis in the direction of arrow B by about 90 ° to predetermined positions in the lens chamber. Glue and fix in place. At this time, the eyepieces 3Ra and 3La are positioned in the directions of the optical axes OR and OL with their rear convex surfaces contacting the convex portions 315.

At this time, the eyepieces 3Ra and 3La are
As shown in FIG. 4, the upper and lower end positions of the connecting portion 31 are
6 is arranged so as to overlap the wall thickness of 6, that is, the connecting portion 3
16 is an eyepiece lens 3R when viewed from the front side of the optical axis
The upper and lower end surfaces of a and 3La are substantially the same as the upper and lower end surfaces and are configured so as not to protrude.

Further, the eyepieces 3Rb and 3Lb are dropped from the rear side of the eyepiece frames 31R and 31L and fixed by adhesion at a predetermined position. At this time, the eyepieces 3Rb and 3L
In b, the convex surface on the front side is in contact with the convex portion 315 and is positioned in the optical axis OR and OL directions.

The vertical thickness of the binoculars thus constructed will be described.

As shown in FIGS. 2 and 4, the thickness in the vertical direction perpendicular to the optical axes OR and OL and perpendicular to the interpupillary direction is the width of the eyepieces 3R and 3L in the short side direction, and the lens frame body 5R. , 5L, the lids 10R, 10L, the base plate 8, and the exterior member, and in the configuration of the present embodiment, the eyepiece frames 31R, 31
The thickness of L itself does not contribute to the overall thickness.

More specifically, the thick end faces of the connecting portions 316 of the eyepiece frames 31R and 31L are equal to the vertical end faces of the eyepiece lenses 3R and 3L, and the connecting portions 316 have the same thickness as the whole. Does not contribute to thickness. In addition, this connecting portion 3
Since 16 is arranged at a position where it does not pose a problem on the optical path, it does not impair the optical performance of the optical system.

The thicker end faces of the upper rear end portions 317 of the eyepiece frames 31R and 31L are equal to the thicker end faces of the lids 10R and 10L, while the lower rear end portions 317 are thicker. Since the thick end face is equal to the thick end faces of the lens frame bodies 5R and 5L, the wall thickness of the rear end portion 317 does not contribute to the total thickness.

By skillfully forming the eyepiece frames 31R and 31L in this manner, the thickness thereof does not contribute to the overall thickness.

According to the first embodiment as described above, the eyepiece frame for fixing the ocular lens, which is an oval lens, extends forward from the rear end portion which is vertically larger than the width of the eyepiece lens in the short side direction. The wall width is cut out so that the width in the vertical direction is equal to the width in the short side direction of the eyepiece, and a hole into which the width in the short side direction of the eyepiece can be inserted is provided in the internal lens chamber. It is provided so as to communicate with each other, and convex portions that define the position of the eyepiece in the optical axis direction are provided on the left and right of the inner peripheral surface, and the lens frame body is arranged from below to cover the front portion, and the lid is arranged from above. As a result, the eyepiece lens can be incorporated without reducing the width in the short side direction, and the overall thickness of the device can be reduced.

Further, the eyepiece frame has a structure in which a part of the eyepiece lens is inserted from the front side and the other part of the eyepiece lens is inserted from the rear side so that the long side of any of the eyepiece lenses is enlarged. Therefore, the device can be made thinner.

Further, since the front end side and the rear end side of the eyepiece frame are connected to each other and have a cylindrical shape, high precision of parts can be ensured and sufficient strength can be obtained when forming molded parts. it can.

7 to 9 show a second embodiment of the present invention. FIG. 7 is a perspective view showing an eyepiece frame, and FIG. 8 is a vertical sectional view taken along the optical axis showing the eyepiece frame. FIG. 9 is a plan sectional view along the optical axis showing the eyepiece frame.

In the second embodiment, the above-mentioned first embodiment is used.
The description of the same parts as those of the embodiment will be omitted,
Only the differences will be mainly described.

The eyepiece frames 31aR and 31aL are substantially oval cylindrical members having a shape that covers the eyepiece lens groups 3R and 3L, which are oval lenses, and the inside thereof is a lens chamber.

The eyepiece frames 31aR, 31aL are provided with the blindfold portions 311aR, 311aR, 31aR, 31aR, 31aR, 31aR, 31aR, 31aR, 31aR, 31aR, 31aR, 31aR, 31aR, 31aR, 31aR, 31aR, 31aR, 31b in the width direction of the eye from both sides of the rear end 317a.
312aR and 311aL, 312aL are extended, and these blindfold parts 311aR, 312aR, 311a
L and 312aL serve to hide the internal structure of the binoculars from the outside when performing the interpupillary adjustment.

The eyepiece frames 31aR, 31aL have upper and lower surfaces cut away from the rear end 317a toward the front by about a thickness, so that the eyepiece frames 31aR, 31aL communicate with the inner lens chambers.
14a are formed on the upper and lower sides, respectively. These holes 3
The front end sides of 13a and 314a are again formed into oval-shaped cylinders by connecting the left side cylinder surface and the right side cylinder surface by a connecting portion 316a.

On both the inner peripheral sides of the left and right sides of the eyepiece frames 31aR and 31aL, the receiving portion 3 for receiving the front surface of the eyepiece lenses 3Ra and 3La and performing positioning in the directions of the optical axes OR and OL.
15a and a receiving portion 315b which receives the convex surfaces on the front side of the eyepieces 3Rb and 3Lb to perform positioning in the optical axis OR and OL directions.
Is provided.

In this embodiment, the lengths of the eyepieces 3Ra and 3La in the long side direction are determined by the eyepiece 3R.
It is slightly shorter than the length of b and 3Lb in the long side direction.

Next, a method for incorporating the eyepiece lens groups 3R and 3L into the eyepiece frames 31aR and 31aL will be described.

First, the eyepieces 3Ra and 3La are dropped from the rear side of the eyepiece frames 31aR and 31aL, and are fixed by adhering when the front lens surface comes into contact with the receiving portion 315a.

Next, the eyepieces 3Rb and 3Lb are dropped from the rear side of the eyepiece frames 31aR and 31aL, and are fixed by adhesion when the front lens surface comes into contact with the receiving portion 315b.

Also at this time, the eyepiece frames 31aR, 31aL
The thick end face of the connecting portion 316a of the eyepiece 3Ra,
It is the same as the vertical end surface of 3La, and the wall thickness of the connecting portion 316a does not contribute to the overall thickness.

The thicker end faces of the upper rear end portions 317a of the eyepiece frames 31aR, 31aL are equal to the thicker end faces of the lids 10R, 10L, while the lower rear end portions 31a are formed.
Since the thick end surface of 7a is equal to the thick end surface of the lens frame bodies 5R and 5L, the wall thickness of the rear end portion 317a does not contribute to the total thickness.

By skillfully forming the eyepiece frames 31aR and 31aL in this manner, the thickness thereof does not contribute to the overall thickness.

According to the second embodiment as described above, even when the front eyepiece is inserted from the rear side of the eyepiece frame like the rear eyepiece, it is almost the same as the first embodiment. The effect of can be produced.

10 to 12 show a third embodiment of the present invention. FIG. 10 is an exploded perspective view along the optical axis showing a lens and a lens holding frame, and FIG. 11 holds the lens. FIG. 12 is a cross-sectional view when the lens holding frame in the state is cut in the long side direction, and FIG. 12 is a cross-sectional view when the lens holding frame in the state where the lens is held are cut in the short side direction.

In the third embodiment, description of the same parts as those of the first and second embodiments described above will be omitted, and only different points will be mainly described.

Each of the lenses 301A and 302A is made of a plastic lens that is comparatively easy to mold in a complicated shape, and has a substantially quadrangular cross section having a short side and a long side in a plane perpendicular to the optical axis. For example, it has an oval shape and has tapered projections 301Aa and 302Aa on the sides that are short sides.
Are formed to project.

Further, the lens holding frame 31A is provided with two arm portions having a width substantially equal to the length of the short sides on the side corresponding to the short sides of the lenses 301A and 302A. Mounting holes 313A and 314A, which are fixing portions, into which the protrusions 301Aa and 302Aa are fitted are provided, respectively.

Further, a convex portion 312 is provided on the tip of the arm portion.
A is provided respectively, and the convex portion 312A is for fitting the ring 311A which is a connecting member after the lenses 301A and 302A are attached.

This ring 311A is used for the lens 301.
It has an oval shape similar to A and 302A, and both arms of the lens holding frame 31A are fitted from the outside in the long side direction as shown in FIG. 11, and the length in the short side direction is shown in FIG. Thus, the lengths of the lenses 301A and 302A in the short side direction are not exceeded.

Next, a method for assembling the lenses 301A and 302A in the lens holding frame 31A in such a structure will be described.

First, the lens 302 is attached to the lens holding frame 31A.
A is inserted and the protrusion 302Aa is fitted into the mounting hole 314A.

Subsequently, the lens 301A is attached to the lens holding frame 3
1A, and similarly, the protrusion 301Aa is fitted into the mounting hole 313A.

After that, by fitting the ring 311A to the convex portion 312A, the arms of the lens holding frame 31A are prevented from opening, and the lenses 301A and 302A are prevented from falling off and are firmly fixed. Position.

At this time, the protrusions 301Aa and 302Aa
Since the taper is formed, it is possible to suppress the backlash by holding it from both arms, and
The relative distance and relative position shift of 02A are minimized.

It should be noted that even if some fitting backlash remains in the mounting holes 313A, 314A and the projections 301Aa, 302Aa, there is no problem because it is a level that is practically acceptable.

According to the third embodiment as described above, substantially the same effects as those of the above-described first and second embodiments are obtained, and the operation of rotating the lens in the lens chamber becomes unnecessary, The work of attaching the lens to the lens holding frame can be simplified. Further, even when the mounting is completed, the lens is positioned at the predetermined position of the lens holding frame, so that the lens does not partially float.

FIGS. 13 to 15 show a fourth embodiment of the present invention. FIG. 13 is an exploded perspective view along the optical axis showing the lens and the lens holding frame, and FIG. 14 holds the lens. FIG. 15 is a cross-sectional view when the lens holding frame in the state is cut in the long side direction, and FIG. 15 is a cross-sectional view when the lens holding frame in the state where the lens is held are cut in the short side direction.

In the fourth embodiment, the above-mentioned first
The description of the same parts as those of the third embodiment will be omitted, and only different points will be mainly described.

The lenses 301B and 302B may be either glass lenses or plastic lenses,
The cross-sectional shape in a plane perpendicular to the optical axis is a substantially square shape having a short side and a long side, for example, an oval shape.

Further, the lens holding frame 31B is provided with two arm portions having a width substantially equal to the length of the short sides on the side corresponding to the short sides of the lenses 301B and 302B. Step portions 313B and 314B, which are fixing portions for positioning and fixing the short sides of the lenses 301B and 302B, are formed, respectively.

Further, a convex portion 312 is provided at the tip of the arm portion.
B is provided, and this convex portion 312B is for fitting the ring 311B, which is a connecting member, after attaching the lenses 301B and 302B.

This ring 311B is used for the lens 301.
B and 302B have a substantially oval shape, and both arm portions of the lens holding frame 31B are fitted from the outside in the long side direction as shown in FIG. 14, and the length in the short side direction is shown in FIG. As described above, the lengths of the lenses 301B and 302B in the short side direction are not exceeded.

Next, a method for assembling the lenses 301B and 302B in the lens holding frame 31B in such a structure will be described.

First, the lens 302 is attached to the lens holding frame 31B.
B is inserted, and the short side of the lens 302B is attached to the step portion 31.
4B, and the adhesive 3
It is fixed by adhesion using 15B.

Subsequently, the lens 301B is attached to the lens holding frame 3
1B, similarly, the short side of the lens 301B is placed on the step portion 313B, and is fixed by adhering with the adhesive 315B.

After that, by fitting the ring 311B to the convex portion 312B, the arms of the lens holding frame 31B are prevented from opening, and the lenses 301B and 302B are prevented from falling off and are firmly fixed. Position.

According to the fourth embodiment as described above, it is possible to obtain substantially the same effects as those of the above-described third embodiment.

[Additional Notes] According to the above-described embodiment of the present invention as described in detail above, the following configuration can be obtained.

(1) It has a lens chamber having a shape similar to that of a substantially quadrangular lens having a shape of a cross section perpendicular to the optical axis, and the length of the lens chamber in the short side direction is substantially square. Each of the opposite long sides of the substantially quadrangular lens is cut by a portion not cut out to one end thereof in the long side direction so as to be substantially equal to the short side direction length of the shaped lens. A lens holding frame comprising: a lens holding member that holds the position; and a position restricting member that restricts the positions of the pair of arms at the one end.

(2) The lens holding frame described in appendix 1, wherein the substantially quadrangular lens is an oval lens or a quadrangular lens.

(3) The shape of the cross section perpendicular to the optical axis is substantially similar to that of the oval lens, and the length of the cross section in the short side direction is substantially parallel to a pair of opposed oval lenses. A lens chamber having a length substantially equal to the side-to-side distance and having a length in the same long-side direction set longer than a length determined by a pair of opposing R-face distances; An oval-shaped lens holding frame, comprising: a lens loading opening provided through the lens chamber.

(4) The oval lens holding frame described in appendix 3, wherein the lens chamber is provided with a fixing portion for positioning and fixing the loaded lens.

(5) The shape of the cross section perpendicular to the optical axis is similar to that of the oval lens, and the length of the cross section in the short side direction is a pair of substantially parallel pairs of the oval lenses facing each other. A lens chamber having a length substantially equal to the side-to-side distance and having a length in the same long-side direction set longer than a length determined by a pair of opposing R-face distances; And a lens loading opening provided through the lens chamber,
The oval-shaped lens is inserted into the lens loading opening from a substantially long side direction of the lens, and then the optical axes of the oval-shaped lens and the lens chamber are aligned with each other, and the length of the oval-shaped lens in a short side direction. And the lens chamber is loaded by rotating the lens chamber by a predetermined angle so that the length of the lens chamber and the length of the lens chamber in the short side direction coincide with each other.

(6) A lens chamber whose cross-section perpendicular to the optical axis is substantially similar to an oval lens, and the lens chamber are provided in each of the lens chambers. A lens loading opening provided through the lens chamber,
A pair for the right eye and for the left eye, when inserting the oval lens into the lens loading opening,
After inserting from the substantially long side direction, by rotating the lens chamber cross section by a predetermined angle, the length of the cross section of the lens chamber in the short side direction is made substantially equal to the distance between the pair of substantially parallel sides facing each other of the oval lens. Binoculars that use an oval-shaped lens.

(7) An oval lens characterized in that the cross-sectional shape of the cross section of the lens chamber in the long side direction is set to be longer than the length determined by a pair of facing R-plane distances. The binoculars according to appendix 6.

(8) The binoculars described in appendix 6, wherein the lens chamber is provided with a fixing portion for positioning and fixing the loaded lens.

(9) In a lens holding frame for holding a substantially quadrangular lens having a short side and a long side, a pair of arm portions having a width substantially equal to the short side of the lens are provided so as to project from the base end portion of the lens holding frame. A lens holding frame, characterized in that the space sandwiched between the arms forms a lens chamber, and the pair of arms holds the short sides of the lens from both sides.

(10) The pair of arm portions are integrally connected by a connecting portion on the tip end side, and the lens is inserted in the long side direction with a lens loading opening between the arm portions.
10. The lens holding frame according to appendix 9, which is mounted by rotating the lens chamber by a predetermined angle.

(11) A lens is mounted along the optical axis in the lens chamber sandwiched by the pair of arm portions, and the distal end sides of the pair of arm portions are connected by a separate connecting member. 10. The lens holding frame according to appendix 9, wherein.

(12) The lens holding frame described in any one of appendices 9 to 11, wherein the arm portion is provided with a fixing portion for positioning and fixing the lens to be mounted.

[0113]

As described above, according to the lens holding frame of the present invention, it is possible to hold a substantially quadrangular lens having a short side and a long side without reducing the length in the short side direction. .

[Brief description of drawings]

FIG. 1 is a plan sectional view showing binoculars according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the binoculars according to the first embodiment.

FIG. 3 is a perspective view showing an eyepiece frame according to the first embodiment.

FIG. 4 is a longitudinal sectional view taken along the optical axis showing the eyepiece frame of the first embodiment.

FIG. 5 is a plan sectional view taken along the optical axis showing the eyepiece frame of the first embodiment.

FIG. 6 is a cross-sectional view showing a state in which an eyepiece lens is incorporated in the eyepiece frame of the first embodiment.

FIG. 7 is a perspective view showing an eyepiece frame according to a second embodiment of the present invention.

FIG. 8 is a longitudinal sectional view taken along the optical axis showing the eyepiece frame of the second embodiment.

FIG. 9 is a plan sectional view taken along the optical axis showing the eyepiece frame of the second embodiment.

FIG. 10 is an exploded perspective view along an optical axis showing a lens and a lens holding frame according to a third embodiment of the present invention.

FIG. 11 is a cross-sectional view of the lens holding frame in a state where the lens is held, cut in the long side direction in the third embodiment.

FIG. 12 is a cross-sectional view of the lens holding frame in a state where the lens is held, cut in the short side direction in the third embodiment.

FIG. 13 is an exploded perspective view along the optical axis showing a lens and a lens holding frame according to a fourth embodiment of the present invention.

FIG. 14 is a cross-sectional view of the lens holding frame in a state where the lens is held in the fourth embodiment, taken along the long side direction.

FIG. 15 is a cross-sectional view of the lens holding frame holding the lens in the fourth embodiment, taken along the short side direction.

FIG. 16 is a longitudinal sectional view showing a conventional eyepiece frame, and FIG.
Cross-sectional view.

FIG. 17 is an exploded perspective view showing a state in which an eyepiece lens is incorporated in a conventional eyepiece frame.

[Explanation of symbols]

3R, 3L ... Eyepiece lens group 301A, 301B, 302A, 302B ... Lens 3Ra, 3La, 3Rb, 3Lb ... Eyepiece (oval lens) 31R, 31L, 31aR, 31aL ... Eyepiece frame (oval lens holding frame) 31A, 31B ... Lens holding frame 311A, 311B ... Ring (connecting member) 313, 314 ... Hole (lens loading opening) 313A, 314A ... Mounting hole (fixing part) 313B, 314B ... Step part (fixing part) 315 ... Convex part (Fixed part) 315a, 315b ... Receiving part (fixed part) 316, 316a ... Connecting part

Claims (3)

[Claims] 1. A lens holding frame for holding a substantially quadrangular lens having a short side and a long side, wherein the lens holding frame has a length in the short side direction formed by cutting out a part thereof in the long side direction. The length is set to be substantially equal to the length of the substantially quadrangular lens in the short side direction, and the opposite short sides of the substantially quadrangular lens are held by the portions that are not notched. Lens holding frame to be used. 2. The lens holding frame according to claim 1, wherein the cutout portion forms a lens loading opening for inserting the lens from a substantially long side direction thereof. . 3. The cutout portion reaches one end of the lens holding frame, whereby the noncutout portion forms a pair of arm portions. The lens holding frame according to 1.