JP2021076639A - Optical instrument - Google Patents

Abstract

To provide a small-sized optical instrument that can accurately adjust a Porro prism.SOLUTION: A binocular comprises: an objective lens; an eye-piece; a pair of Porro I type prisms L2 each having one transmission surface L2a, two reflection surfaces L2b, and a side face L2c that is perpendicular to the two reflection surfaces L2b, and guiding light from the objective lens to the eye-piece; and a prism base 9 having an outer wall that surrounds the respective Porro I type prisms L2, a butting wall against which the side faces L2c of the respective Porro I type prisms L2 are butted, and a convex seat part 9f with which the transmission surfaces L2a of the respective Porro I type prisms L2 are in contact. The butting wall is formed integrally with the outer wall, and the outer wall is provided with an adhesive hole 9k for injecting an adhesive between the butting wall 9e and the side face L2c.SELECTED DRAWING: Figure 6

Description

The present invention relates to an optical instrument.

In an optical device having an erect optical system between the objective optical system and the eyepiece optical system, it is necessary to align the optical axis of the objective optical system with the optical axis of the eyepiece optical system, so that the position of the erect optical system needs to be adjusted. It becomes.

In Patent Document 1, in binoculars having a pair of polo prisms, a recess for adhesive is provided in the vicinity of a mounting portion for mounting the polo prism on a prism base, and an adhesive is injected into the recess to polo. It is disclosed that the prism is fixed.

Utility Model Registration No. 2536275

However, in Patent Document 1, when the objective optical system and the eyepiece optical system are connected before and after the Porro prism, it is difficult to inject the adhesive into the recess. Furthermore, it is also difficult to adjust the Porro prism with high accuracy after bonding the Porro prism. In addition, a recess is provided near the opening through which light incident from one Porro prism to the other passes, and a sufficient gap is required between the opening and the recess so that the adhesive does not flow into the opening. , The configuration becomes large.

An object of the present invention is to provide a small optical device capable of adjusting a Porro prism with high accuracy.

The optical device of the present invention has an objective optical system, an eyepiece optical system, one transmission surface, two reflection surfaces, and a side surface perpendicular to the two reflection surfaces, and light from the objective optical system. A pair of prisms leading to the eyepiece optical system, an outer wall portion surrounding the prisms, a first contact portion with which the side surfaces of the prisms abut, and a transmission surface of the prisms contact each other. A base having a second contact portion in contact with the first contact portion is provided, and the first contact portion is integrally formed with the outer wall portion, and the outer wall portion is formed with the first contact portion. It is characterized in that an opening for injecting an adhesive is provided between the side surface and the side surface.

According to the present invention, it is possible to provide a small optical device capable of adjusting the Porro prism with high accuracy.

It is external perspective view of the binoculars (optical equipment) of an Example. It is sectional drawing of the binoculars of an Example. It is sectional drawing at the break line III-III of FIG. It is sectional drawing at the break line IV-IV of FIG. It is an exploded perspective view which looked at the structure of the erecting optical system from the objective side. It is an exploded perspective view which looked at the structure of the erecting optical system from the eyepiece side. It is the figure which looked at the structure of the erecting optical system from the objective side. It is a figure which looked at the prism base 9 from the objective side. (A) is a cross-sectional view taken along the line IX-IX of FIG. (B) is an enlarged view. FIG. 5 is a cross-sectional view taken along the line XX of FIG. It is a figure seen from the XI direction of FIG. It is a figure seen from the XII direction of FIG. It is the figure which looked at the structure of the erecting optical system of the modified example from the objective side. It is sectional drawing in FIG. 13 breaking line XIV-XIV.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. The same member in each figure is given the same reference number, and duplicate description is omitted.

(Example)
FIG. 1 is an external perspective view of the binoculars (optical equipment) of the embodiment. The binoculars have a pair of left and right objective optical systems, a pair of left and right upright optical systems, and a pair of left and right eyepiece optical systems. The left and right sides correspond to the left and right of both eyes observing the binoculars. Further, in the drawings of the present invention, the object side observed by the binoculars is also referred to as the front side, and the observer (user) side is also referred to as the rear side. The optics and configuration of the left and right sides are basically the same, but when the left and right sides are explained separately, the member with L at the end of the member number indicates the member on the left side, and the end of the member number. The member with R is indicated on the right side. If there is no difference between the left and right members, the description of L and R at the end of the member number is omitted.

In FIG. 1, the optical axis OL of the left objective optical system corresponding to the left eye and the optical axis OR of the right objective optical system corresponding to the right eye are parallel, and the distance between the optical axis OL and the optical axis OR is large. A state is shown in which the distance between the optical axis EL of the left eyepiece optical system and the optical axis ER of the right eyepiece optical system is the same. In the following description, the optical axes OL and OR of the objective optical system will be the objective optical axes, and the optical axes EL and ER of the eyepiece optical system will be the eyepiece optical axes. Further, the direction in which the objective optical axis (or the eyepiece optical axis) is separated is defined as the left-right direction (first direction), and the direction in which each optical axis extends is defined as the optical axis direction (second direction). Of the directions orthogonal to the optical axis direction and the left-right direction, the upper surface side of the binoculars in the normal posture is the upper side and the lower surface side is the lower side as shown in FIG.

In the binoculars of the present invention, the upper cover 1 and the lower cover 2 accommodate the left and right objective optical systems, and hold the objective cover 3 and the protective rubber 4 at the front end portions thereof. The protective rubber 4 uses the elasticity of the protective rubber 4 itself to reduce the impact on the inside due to dropping of the binoculars or the like. FIG. 2 is a cross-sectional view of the binoculars shown in FIG. 1 in a plane including both the optical axis OL and the optical axis EL, and shows the optical system on the left side. The eyepiece base member 14 is fixed to the upper cover 1 by a fixing screw (not shown), and accommodates a mechanism for adjusting the eye width and a mechanism for focusing, which will be described later, and includes left and right upright optical systems and eyepiece optical systems. It supports the left and right eyepiece units 13L and 13R.

The configuration on the left side of the binoculars will be described with reference to FIG. 2, but the configuration on the right side is also the same. An objective lens L1L is provided as an objective optical system. As an upright optical system, a pair of Polo I-type prisms L2L are provided. An eyepiece lens L3L is provided as an eyepiece optical system. The optical axis OL from the objective lens L1L is totally reflected by the pair of Polo I-type prisms L2L and coincides with the optical axis EL of the eyepiece optical system.

The front lens barrel 5L holds the objective lens L1L and is fixed to the objective base 6. The objective base 6 is formed with an objective mounting surface 6a parallel to a surface orthogonal to the optical axis OL, and the front lens barrel 5L is fixed to the objective mounting surface 6a with mounting screws 7. The tilt of the front lens barrel 5L is adjusted by an eccentric roller (not shown) so that the optical axis OL of the front lens barrel 5L coincides with the optical axis EL of the eyepiece optical system, and the light of the front lens barrel 5L is adjusted. The position in the direction orthogonal to the axis is determined.

The prism holder 8L is integrated with the prism base 9L by a screw or the like (not shown) and connected to the eyepiece base member 14. The pair of Polo I-shaped prisms L2L are held on the prism base 9L in an arrangement in which the transmission surfaces L2a (see FIG. 5) face each other and are rotated by 90 ° about a direction orthogonal to the transmission surfaces L2a. The prism base 9L and the eyepiece holder 11L are integrated with a screw or the like (not shown) so that the Polo I type prism L2L and the eyepiece lens L3L have a predetermined positional relationship (about the holding mechanism and the adjusting mechanism of the Polo I type prism L2L). Details will be described later).

The eyepiece tube 10L holds a plurality of eyepiece lenses L3L, and is held by the eyepiece holder 11L. Male helicoid screws are formed on the outer peripheral wall of the eyepiece tube 10L, and female helicoid screws are formed on the inner peripheral wall of the eyepiece holder 11L. By screwing these screw portions, the eyepiece tube 10L becomes the eyepiece holder 11L. It is connected. By rotating either the eyepiece tube 10L or the eyepiece tube 10R on the right side (not shown) and moving the eyepiece tube 10L or the eyepiece tube 10R forward and backward along the optical axis EL, the left and right diopters can be adjusted. It is possible. The eyepiece rubber 12L is put on the eyepiece tube 10L, and the eyepiece position can be changed by folding back the side portion on the side to be in contact with the eye. The eyepiece unit 13L on the left side is composed of a Polo I-type prism L2L, a plurality of eyepiece lenses L3L, a target rubber 12L, and the like. Further, the eyepiece unit 13R on the right side is also configured with the same configuration.

The eyepiece base member 14 is a support member that rotatably supports the left and right eyepiece units 13L and 13R around the optical axes OL and OR of the left and right objective optical systems, and further supports the left and right objective optical systems with the optical axes OL and OR. It also supports a mechanism that advances and retreats along the line to focus according to the observation distance. The eyepiece base member 14 is made of metal because it requires high rigidity and accuracy. The eyepiece base member 14 is provided with an opening 14La coaxial with the optical axis OL of the left objective optical system and an opening 14Ra (not shown) coaxial with the optical axis OR of the right objective optical system. A cylindrical portion 8La provided in the prism holder 8L is rotatably fitted in the opening 14La on the left side. The structure of the opening 14Ra on the right side is the same as that of the opening 14La on the left side.

FIG. 3 is a cross-sectional view taken along the line III-III of FIG. The left and right interlocking plates 15L and 15R are interlocked with the rotational movement of the cylindrical portions 8La and 8Ra of the prism holders 8L and 8R, respectively. The interlocking plates 15L and 15R are provided with gear portions 15La and 15Ra, and a plurality of arm portions 15Lb and 15Rb, respectively. The gear portions 15La and 15Ra are incorporated at predetermined positions, and by engaging the gear portions 15La and 15Ra, the rotations of the left and right eyepiece units 13L and 13R can be interlocked. The interlocking plates 15L and 15R are fastened to the prism holders 8L and 8R with screws in a state where the tip portions of the plurality of arm portions 15Lb and 15Rb are in contact with the eyepiece base member 14, respectively. With this configuration, the plurality of arm portions 15Lb and 15Rb generate an urging force that urges the interlocking plates 15L and 15R in the directions of the optical axes OL and OR. The optical axes EL and ER (not shown) are eccentric with respect to the optical axes OL and OR by a pair of left and right Polo I-type prisms L2L and L2R, respectively. The widths of the optical axes EL and ER change. With this mechanism (mechanism for adjusting the eye width), it is possible to adjust the eye width so that the distance between the left and right pupils of the observer using the binoculars and the distance between the optical axes EL and ER are matched.

FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. The objective base portion 14Rb (or 14Lb) is a portion of the eyepiece base member 14 having a surface parallel to both the optical axes OL and OR of the objective optical system, and is used for focusing according to the observation distance. The left and right objective optical systems are supported so as to be able to move forward and backward along the optical axes OL and OR. The focus plate 16 is a focus support member connected to an objective base 6 to which the objective optical system is fixed, and can freely move forward and backward in the directions of the optical axes OL and OR with respect to the objective base portion 14Rb (or 14Lb) by a guide mechanism. Supported and guided.

The focus operation dial 17 is coupled to the feed screw 19 with a dial stop screw 20 so as to cover the end portion in the optical axis direction of the screw receiving member 18 fixed to the eyepiece base member 14 with a screw or the like. Therefore, the focus operation dial 17 is restricted from moving in the directions of the optical axes OL and OR, but can rotate at a fixed position together with the feed screw 19. The drive nut 21 meshes with the threaded portion of the feed screw 19 and is fixed to the focus plate 16 with a nut fixing screw (not shown). By rotating the focus operation dial 17, the drive nut 21 advances and retreats the objective base 6 connected to the focus plate 16 along the optical axis OR (or OL). As the focus operation dial 17 moves the objective base 6 in the direction of the optical axis OR (or OL), the left and right objective optical systems move as a whole, so that focusing is performed according to the observation distance. The above configuration constitutes a mechanism for focusing.

Next, the details of the holding mechanism of the Polo I type prism L2 will be described. FIG. 5 is an exploded perspective view of the configuration of the erect optical system as viewed from the objective side, and FIG. 6 is an exploded perspective view of the configuration of the erect optical system as viewed from the eyepiece side. FIG. 7 is a view of the configuration of the upright optical system as viewed from the objective side, and FIG. 8 is a view of the prism base 9 as viewed from the objective side. 9 (A) is a cross-sectional view taken along the line IX-IX of FIG. 7, and FIG. 9 (B) is an enlarged view of a portion shown by a square chain line of FIG. 9 (A). FIG. 10 is a cross-sectional view taken along the line XX of FIG. 11 is a view seen from the XI direction of FIG. 7, and FIG. 12 is a view seen from the XII direction of FIG. 7. Since the left and right configurations are the same, the description of L and R indicating the difference between the left and right at the end of the member number is omitted.

Each of the pair of Polo I-type prisms L2, which is an erect optical system, is a bending optical system including one transmitting surface L2a, two reflecting surfaces L2b, and two side surfaces L2c perpendicular to the two reflecting surfaces. The two reflecting surfaces L2b are each inclined at 45 ° with respect to one transmitting surface L2a, and the angles formed by each other are at right angles. Therefore, the light incident from the transmitting surface L2a is specularly reflected by one of the two reflecting surfaces L2b, then specularly reflected by the other reflecting surface L2b, and finally emitted from the transmitting surface L2a. As described above, the pair of Polo I-type prisms L2 are arranged so that the transmission surfaces L2a face each other and are rotated by 90 ° about the direction orthogonal to the transmission surfaces L2a. With this configuration, the light incident from the transmission surface L2a of one Polo I-type prism L2 is specularly reflected four times and emitted from the transmission surface L2a of the other Polo I-type prism L2 to form an upright image, and the eyepiece lens L3 Guided to.

The prism base 9 has an incident opening 9a through which light emitted from the objective optical system passes, a passing opening 9b through which light passing between the pair of Polo I-type prisms L2 passes, and exit from the Polo I-type prism L2. An exit opening hole 9c through which the light is passed is provided. The center of the incident aperture 9a is coaxial with the optical axis O of the objective optical system, and the center of the exit aperture 9c is coaxial with the optical axis E of the eyepiece optical system. One of the pair of Polo I-type prisms L2 was arranged on the eyepiece side, the light from the incident opening hole 9a of the prism base 9 was incident, and the light was totally reflected twice in the one Polo I-type prism L2. After that, light is emitted from the passage opening hole 9b. The other side of the pair of Polo I-type prisms L2 is arranged on the objective side, the light that has passed through the passage opening hole 9b of the prism base 9 is incident, and the light is totally twice inside the other Polo I-type prism L2. After reflection, light is emitted from the exit opening hole 9c. Then, the emitted light is incident on the eyepiece optical system.

The outer wall 9d (outer wall portion) that surrounds each of the pair of Polo I-type prisms L2 and one of the two side surfaces L2c of the pair of Polo I-type prisms L2 are in contact with the prism base 9, and are integrated with the outer wall 9d. The abutting wall 9e (first contact portion) provided in the above is provided. Further, the prism base 9 is provided with a convex seat portion 9f (second contact portion) on which a part of the transmission surface L2a is mounted. As shown in FIG. 7, the abutting wall 9e is separated by a length D1 from one side and the other side away from the plane S that bisects the angle formed by the two reflecting surfaces L2b of the Polo I-type prism L2. It is provided on the outer wall 9d.

As shown in FIG. 8, the prism base 9 is provided with a positioning portion 9h at a position separated from the plane S on one side, and an urging spring 23 (second urging member) at a position separated from the plane S on the other side. ) Is provided with an urging spring holding portion 9i. Then, as shown in FIG. 7, the urging spring 23 is attached to the urging spring holding portion 9i. Each of the pair of Polo I-type prisms L2 is a line forming the shape of the pair of Polo I-type prisms L2 that is outside the effective range of the light passing through the transmission surface L2a and is separated from the plane S by a predetermined distance. Each surface abuts on the positioning portion 9h. On the opposite side of the pair of Polo I-type prisms L2 that abut the positioning portion 9h, the pair of Polo I-type prisms that are outside the effective range of the light passing through the transmission surface L2a and are separated from the plane S by a predetermined distance. The line or surface forming the shape of L2 abuts on the urging spring 23, respectively. Then, the urging spring 23 generates an urging force in the direction facing the positioning portion 9h.

A light-shielding sheet 24 for preventing stray light is attached to the outside of the two reflecting surfaces L2b of the pair of Polo I-type prisms L2. Then, each of the pair of Polo I-shaped prisms L2 is held by the holding plate 27 (the first) so that the tops formed by the two reflecting surfaces L2b are urged against the convex seat portion 9f of the prism base 9 from above the light-shielding sheet 24. It is held by the prism base 9 by the urging member of 1). The holding plate 27 is integrally fixed to the prism base 9 by a screw 25 and a step screw 26. The above configuration is the holding mechanism of the Polo I type prism L2. In view of the operation of the adjustment mechanism described later, it is desirable that the contact area where the holding plate 27 contacts the top of the Polo I type prism L2 is small. Further, the holding plate 27 is provided with two notch portions 27a, which also serve as positioning of the urging spring 23 and preventing it from coming off.

As described above, the widths of the optical axes EL and ER are changed by rotating the eyepiece units 13L and 13R to adjust the eye width. However, due to the variation in tolerance of each part, the rotation center of the eyepiece units 13L and 13R is adjusted. , Optical axes EL and ER do not always match. Therefore, it is necessary to adjust the transmission surfaces L2a of the pair of Polo I-type prisms L2 of the left and right optical systems so as to be orthogonal to the optical axis OL and the optical axis EL, respectively.

Next, the details of the adjustment mechanism of the Polo I type prism L2 will be described. As shown in FIG. 9A, the prism base 9 is provided with a nut accommodating portion 9g, and the nut 29 is integrally held by the nut accommodating portion 9g. When the adjusting screw 28 (pressing member) is screwed into the female screw of the nut 29 and the adjusting screw 28 is tightened, the tip portion 28a of the adjusting screw 28 hits the contact portion L2d of the polo I type prism L2. Get in touch. That is, the adjusting screw 28, the abutting wall 9e, and the convex seat portion 9f come into contact with the Polo I type prism L2.

The contact portion L2d at which the tip portion 28a of the adjusting screw 28 abuts on the polo I-shaped prism L2 is located at a height H2 in a direction away from the convex seat portion 9f. Then, as shown in FIG. 9B, the abutting wall 9e abuts on a part of one side surface L2c of the Polo I type prism L2. At this time, assuming that the size of the maximum contact region where the side surface L2c in the direction away from the convex seat portion 9f abuts on the abutting wall 9e is the height H1, the relationship between the height H1 and the height H2 is H1 <. It is H2.

The convex seat portion 9f abuts on a part of the transmission surface L2a of the Polo I type prism L2. At this time, the maximum contact region where the transmission surface L2a in the direction away from the abutting wall 9e abuts on the convex seat portion 9f. Let the size of be the length D2. Further, as shown in FIG. 9A, the contact portion L2e in which the holding plate 27 indirectly abuts on the polo I-type prism L2 is located at a position of length D3 in a direction away from the abutting wall 9e. The relationship between the length D2 and the length D3 is D2 <D3. Based on the above relationship, the adjusting screw 28 is moved forward and backward in the direction facing the wall 9e to adjust the transmission surface L2a of the Polo I-type prism L2 to the transmission surface L2a'shown by the broken line in FIG. 9B. can do. At the same time, the side surface L2c becomes the side surface L2c'shown by the broken line in FIG. 9B. That is, the adjusting screw 28 adjusts the contact area (contact point) of the abutting wall 9e that contacts a part of the side surface L2c and the contact area (contact point) of the convex seat portion 9f that contacts a part of the transmission surface L2a. Then, the transmission surface L2a of the Polo I type prism L2 can be adjusted. The above configuration is the adjustment mechanism of the Polo I type prism L2.

After adjusting the Polo I-type prism L2 as described above, the Polo I-type prism L2 is fixed to the prism base 9 with an adhesive. In the embodiment, as shown in FIG. 11, the outer wall 9d provided with the abutting wall 9e has an adhesive hole 9k opened from a direction facing the side surface L2c of the polo I-shaped prism L2 abutting on the abutting wall 9e. (Opening) is provided. After adjusting the position of the Polo I-type prism L2, the boundary between the Polo I-type prism L2 and the abutting wall 9e can be easily adhered and fixed by injecting an adhesive through the adhesive hole 9k. The adhesive to the boundary between the Polo I-shaped prism L2 and the abutting wall 9e can be injected from the outer circumference in the direction orthogonal to the optical axis E of the eyepiece optical system. With this configuration, since the light passing through the pair of Polo I-type prisms L2 is not blocked during the bonding operation, it is possible to adjust and bond the objective optical system and the eyepiece optical system in the front and rear.

Conventionally, a recess for adhesive of the Porro prism is provided near the opening through which the light of the Porro prism passes, and the objective optical system and the eyepiece optical system are connected to the front and back of the Porro prism to bond the Porro prism. Was difficult. When the objective optical system and the eyepiece optical system are not connected to the front and rear, it is necessary to adjust the porro prism with respect to the center of the optical axis of the dummy, and the objective optical system and the eyepiece optical system are connected after the adjustment by the dummy. Then, the optical axis shifts due to the processing error between the objective optical system and the eyepiece optical system. In order to eliminate this deviation, it is necessary to further provide an adjustment mechanism in the objective optical system or the eyepiece optical system, and the optical equipment has become large.

However, in the embodiment, since it is not necessary to provide the recess for the adhesive near the passage opening hole 9b of the prism base 9, after adjusting the Polo I type prism L2, the objective optical system and the eyepiece optical system are connected and bonded. It is easy to do and does not require dummy adjustment. Further, the fact that it is not necessary to provide the recess for the adhesive also contributes to the miniaturization of the optical device.

Further, in order to prevent the adjusting screw 28 after adjustment from loosening, the adjusting screw 28 is adhesively fixed. As shown in FIG. 12, in the vicinity of the nut storage portion 9g of the prism base 9, the adhesive can be retained even if the adhesive is injected to fix the adjusted adjusting screw 28. A wall 9j is provided. As shown in FIGS. 7 and 8, the nut accommodating portion 9g is provided inside the outer wall 9d and at a position avoiding the incident opening hole 9a, the passing opening hole 9b, and the exit opening hole 9c. The length D4 is separated from the plane S in one direction. The relationship between the length D1 and the length D4 is D1> D4.

The position of the contact portion L2d where the adjusting screw 28 abuts on the polo I-type prism L2 is ideally on the plane S of the side surface L2c. However, in the vicinity of the side surface L2c on the plane S, there is an incident opening hole 9a or an exit opening hole 9c through which light incident or emitted from the other Polo I-type prism L2 passes, and the ideal side surface L2c is on the plane S. It is difficult to install the contact portion L2d on the surface. In order to abut on the plane S while keeping a sufficient distance from the entrance opening hole 9a or the exit opening hole 9c, it is necessary to increase the size of the Polo I-type prism L2, which leads to an increase in the size of the entire binoculars. Therefore, by providing the adjusting screw 28 at a position sufficiently distant from the incident opening hole 9a or the outgoing opening hole 9c and at a position where stable adjustment can be performed, stable adjustment can be performed without enlarging the optical device. It becomes.

Further, as shown in FIGS. 7 and 8, the positioning portion 9h of the prism base 9 and the urging spring 23 can regulate the movement of the polo I-type prism L2 in the direction perpendicular to the plane S. The I-type prism L2 does not need to have a margin for misalignment in the optical effective diameter. Therefore, the binoculars can be miniaturized.

As described above, it is possible to provide binoculars that are compact while realizing stable and accurate adjustment of the Polo I type prism L2. In the embodiment, the nut 29 is integrally held in the nut storage portion 9g provided on the prism base 9 and screwed with the adjusting screw 28, but the present invention is not limited to this configuration and is directly attached to the prism base 9. The female screw may be processed. Further, although the light-shielding sheet 24 is used to prevent stray light from the Polo I-type prism L2, it is not limited to the sheet parts, and may be metal parts, molded parts, or the like. Although the urging spring 23 is mentioned as a means for regulating the movement of the Polo I-type prism L2 in the direction perpendicular to the plane S, an elastic member such as a leaf spring or rubber may be used.

(Modification example)
Next, a holding mechanism of a pair of porro prisms of binoculars, which is a modification of the present invention, will be described. The modified example has a different shape from the holding plate 27 in the embodiment. Therefore, the configuration of the other parts is the same as that of the embodiment, and the description thereof will be omitted. FIG. 13 is a view of the upright optical system of the modified example as viewed from the objective side, and FIG. 14 is a cross-sectional view taken along the breaking line XIV-XIV of FIG.

The holding plate 227 (first urging member) of the modified example not only urges the apex formed by the two reflecting surfaces L2b of the Polo I type prism L2, but also further includes an arm portion 227b. The holding plate 227 can urge the polo I-shaped prism L2 in the direction facing the positioning portion 9h of the prism base 9 by the arm portion 227b. The holding plate 227 is fixed to the prism base 9 by the step screw 26, and the hole provided in the holding plate 227 that engages with the step screw 26 is formed as a long hole in the longitudinal direction of the holding plate 227 and is long. A part of the holding plate 227 for forming the hole is left as the arm portion 227b.

The holding plate 227 in the modified example can also have the function of the urging spring 23 provided in the embodiment, can reduce the urging spring 23, and also the urging spring holding portion 9i of the prism base 9. Since it is no longer necessary, it can be made smaller than the embodiment. It is possible to provide binoculars that are compact while realizing stable and accurate adjustment of the Polo I-type prism L2 by the configuration of the modified example.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and modifications can be made within the scope of the gist thereof.

L1L objective lens (objective optical system)
L2, L2L Polo I type prism (prism)
L2a Transmissive surface L2b Reflective surface L2c Side surface L3, L3L Eyepiece (eyepiece optical system)
9 Prism base (base)
9d outer wall (outer wall)
9e abutment wall (first contact part)
9f Convex seat (second contact)
9k adhesive hole (opening)

Claims (8)

Objective optics and
Eyepiece optics and
A pair of prisms, each of which has one transmission surface, two reflection surfaces, and a side surface perpendicular to the two reflection surfaces, and guides light from the objective optical system to the eyepiece optical system.
A base having an outer wall portion surrounding each of the prisms, a first contact portion with which the side surface of each of the prisms abuts, and a second abutment portion with which the transmission surface of each of the prisms abuts. With
The first contact portion is integrally formed with the outer wall portion.
An optical device characterized in that the outer wall portion is provided with an opening for injecting an adhesive between the first contact portion and the side surface portion. Claim 1 is characterized in that the first abutting portion is provided one by one in the direction away from the plane that bisects the angle formed by the two reflecting surfaces and one on the other. Described optical equipment. Further provided with a pressing member for pressing each of the prisms,
The base has an incident opening hole for incidenting the light on one of the pair of prisms and a passing opening hole for reflecting the incident light on the one prism and passing the light toward the other of the pair of prisms. And an exit opening for the light that has passed through to be reflected by the other prism and emitted.
The pressing member can move forward and backward in a direction facing the outer wall portion, is provided in the vicinity of the incident opening hole or the exit opening hole, and is separated from the plane that bisects the angle formed by the two reflecting surfaces. The optical device according to claim 1 or 2, wherein the optical device is provided in a direction and a distance shorter than that of the first contact portion. The optical device according to claim 3, wherein the pressing member is adhered to the base. Each of the first urging members further comprises a first urging member for urging each of the prisms, and each of the first urging members urges the apex of the two reflective surfaces with respect to the base. The optical device according to any one of claims 1 to 4, which is fixed to a base and holds each of the prisms. The base has a positioning portion for positioning each of the prisms.
Each of the prisms is urged so as to abut on the positioning portion with a line or surface separated by a predetermined distance in one of the directions away from the plane that bisects the angle formed by the two reflecting surfaces. 5. The optical device according to claim 5. A second urging member is provided on the other side of the direction away from the plane that bisects the angle formed by the two reflecting surfaces so as to urge each prism with respect to the positioning portion at a predetermined distance. The optical device according to claim 6, wherein the optical device is characterized by the above. The optical device according to claim 6, wherein the first urging member urges each prism with respect to each positioning portion.

Images