JP2001324681A - Eye cup mechanism for optical apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an eyepiece cup mechanism which is capable of moving an eye cup cover at a large delivery amount in spite of a compact optical apparatus of a small diameter of eyepiece outer barrels. SOLUTION: The outer side of an eyepiece holding barrel for housing and holding the eyepiece lens is provided with the plural eyepiece outer barrels having multiple structures and the eyepiece outer barrel on the innermost periphery is disposed slidably with the outer peripheral part of the eyepiece lens holding barrel. An eye cup cover is mounted at the outer peripheral part of the eyepiece outer barrel on the outermost periphery and the respective eyepiece outer barrels are provided with moving mechanisms which respectively exist on the inner sides thereof and are slidable with the eyepiece lens holding barrel or the outer peripheral parts of the eyepiece outer barrels in such a manner that the eye cup cover is moved into the optical axis direction of the eyepiece lens.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eyepiece mechanism for an optical instrument having an eyepiece such as a binocular or an optical microscope.

[0002]

2. Description of the Related Art In an optical apparatus, there is provided an eye for obstructing light coming from around the eye when an observer looks into an eyepiece so as to facilitate observation. The eyepiece is often formed of an elastic body such as rubber on an eyepiece holding cylinder that holds the eyepiece. The rubber eyepiece is used by being turned upside down on the optical device main body side or by returning the folded object depending on whether or not the observer wears glasses.

[0003] Since such an operation is troublesome for an observer, a slide-type eyelet in which this operation is improved is described in JP-A-9-222569. FIG.
It is a longitudinal section of the conventional slide type eyepiece (slide eyepiece) mechanism, and shows the state where the eyepiece was taken in. FIG.
FIG. 10 is a longitudinal sectional view of a state where the eye is extended in the direction of the eye from the state of FIG. 9. In FIG. 9, a distance 1 between an observer's eye E (exactly, the exit pupil) and the last optical surface S of the eyepiece 3 is called an eye relief. You can overlook the field of view. The eye relief has a different length depending on the configuration of the eyepiece.

An eyepiece holding tube 2 holds the eyepiece 3 and is attached to the optical device main body 1. The eyepiece outer cylinder 16 is slidably attached to the outer peripheral portion of the eyepiece lens holding cylinder 2. The eyepiece outer cylinder 16 is integrated with the eye cover 10 by bonding or the like. To shift from the state of FIG. 9 to the state of FIG. 10, the eye cover 10 is rotated around the optical axis. Cam screw 1 implanted in eyepiece holding cylinder 2
The head of No. 5 is engaged with a cam groove provided in the eyepiece outer cylinder 16, and when this head slides from one end of the cam groove to the other end, the state of FIG. The transition to the state is completed. In FIG. 10 as well, the eye relief is invariable to 1. 9 and 10, the distance between the last optical surface S of the eyepiece 3 and the tip end T of the eye cover 10 is represented by l.
Assuming that 1, l2, the moving distance, that is, the feeding amount is
(12−11).

[0005]

The above-mentioned aim of the elastic body has a drawback that the operation of folding and returning the elastic body is troublesome, and the elastic body is easily deteriorated by repeating such an operation.

The above-mentioned slide eyepiece has an advantage that the operation is easy, but the feeding amount (stroke amount in the optical axis direction) is limited by the length of the cam groove. Since the length of the cam groove is basically limited by the diameter of the eyepiece barrel, there is a drawback that a sufficient feeding amount cannot be obtained with a compact device having a small diameter of the eyepiece barrel.

SUMMARY OF THE INVENTION An object of the present invention is to enable a large amount of extension to be obtained even with a compact optical apparatus having a small diameter of an eyepiece outer cylinder.

[0008]

According to a first aspect of the present invention, a plurality of eyepiece outer cylinders having a multiplex structure are provided outside an eyepiece holding cylinder for housing and holding an eyepiece, and an innermost eyepiece is provided. An outer cylinder is provided so as to be slidable with the outer peripheral portion of the eyepiece holding cylinder, and an eye cover is attached to the outer peripheral part of the outermost eyepiece outer cylinder. The eye cover is attached to these eyepiece outer cylinders in the optical axis direction of the eyepiece. This is an eyepiece mechanism of an optical apparatus including a moving mechanism slidable with an outer peripheral portion of an eyepiece lens holding cylinder or an eyepiece outer cylinder located inside the eyepiece lens holding cylinder or the eyepiece outer cylinder, respectively.

This moving mechanism includes a cam mechanism and a click mechanism, and is configured to be capable of sliding and positioning between a plurality of eyepiece barrels and an eyepiece holding barrel or eyepiece barrel located inside each of the plurality of eyepiece barrels. (Claim 2).

[0010] One end of the cam groove provided in each of the plurality of eyepiece outer cylinders may be formed in a direction perpendicular to the optical axis direction of the eyepiece. Further, the urging force of the elastic member of the click mechanism is sequentially changed in each of the plurality of eyepiece outer cylinders so that the inner side becomes larger (claim 4).
It can be made smaller (claim 5).

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the eye sighting mechanism according to the present invention, the payout amount (stroke amount in the optical axis direction) is increased by performing the payout in two or more stages, compared with the conventional one in which the payout is performed in one step. Things. That is, if the eyepiece outer cylinder is provided in a double manner, a payout amount for two stages can be obtained, and if provided in a triple manner, a payout amount for three stages can be obtained.

Hereinafter, an aiming mechanism (two-stage type) of this embodiment will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of an eyepiece according to an embodiment of the present invention, and shows a state in which the eyesight has been retracted. FIG. 3 is a longitudinal sectional view of the eyepiece according to the embodiment of the present invention, and shows a state in which the eyepiece is extended one step. FIG. 5 is a longitudinal sectional view of the eyepiece according to the embodiment of the present invention, and shows a state in which the eyepiece is further extended by one step. FIG.
3 is a sectional view taken along the line AA in FIG. 1, FIG. 4 is a sectional view taken along the line BB in FIG. 3, and FIG. 6 is a sectional view taken along the line CC in FIG. In FIG. 6, a line corresponding to an imaginary line is also illustrated for easy understanding.

[0013] In such an extension or retraction, the extension amount or the retraction amount is limited by the cam mechanism, and the extension position or the retraction position is determined by the click mechanism.

With reference to FIG. 1, the target structure will be described in detail. The eyepiece holding tube 2 holds the eyepiece 3,
It is attached to the optical device body 1. First eyepiece barrel 6
Is slidably attached to the outer peripheral portion of the eyepiece holding cylinder 2, and the second eyepiece outer cylinder 9 is slidably attached to the outer peripheral portion of the first eyepiece outer cylinder 6. The second eyepiece outer cylinder 9 is integrated with the eye cover 10 by bonding or the like. The eye relief, which is the distance between the observer's eye E and the last optical surface S of the eyepiece 3, is indicated by L. The distance between the last optical surface S of the eyepiece 3 and the tip T of the eye cover 10 is indicated by L1.

The state without extension in FIG. 1 will be described in more detail with reference to FIG. The cam mechanism in FIG. 2 includes a head 5 of a first cam screw 5 implanted in the eyepiece holding cylinder 2.
a engages with a cam groove 6 c provided in the first eyepiece outer cylinder 6. The head 8a of the second cam screw 8 implanted in the first eyepiece outer cylinder 6 is engaged with a cam groove 9c provided in the second eyepiece outer cylinder 9. The head 5a of the first cam screw 5 is locked in contact with one end 6d of the cam groove 6c of the first eyepiece outer cylinder 6. The head 8a of the second cam screw 8 is locked in contact with one end 9d of the cam groove 9c of the second eyepiece outer cylinder 9.

In the click mechanism shown in FIG. 2, the projection 4a of the first leaf spring 4 attached to the eyepiece holding cylinder 2 engages with the first engagement groove 6a provided in the first eyepiece outer cylinder 6, and Projection 7a of second leaf spring 7 attached to first eyepiece outer cylinder 6
Are engaged with a second engagement groove 9 a provided in the second eyepiece outer cylinder 9.

Next, a description will be given of the state from the state shown in FIG. 1 to the state shown in FIG. 3 (state in which the target cover is extended one step). In FIG. 3, the distance between the last optical surface S of the eyepiece 3 and the tip T of the eye cover 10 is indicated by L2,
2> L1. Referring to FIG.
The head 5a of the cam screw 5 is located on the cam groove 6c of the first eyepiece outer cylinder 6.
And the protrusion 4a of the first leaf spring 4 of the eyepiece holding cylinder 2 is in contact with the first end 6d of the first eyepiece outer cylinder 6.
The point engaged with the engagement groove 6a is the same as in FIG. However, the fact that the head 8a of the second cam screw 8 is in contact with one end 9e of the cam groove 9c of the second eyepiece outer cylinder 9 and the projection 7a of the second leaf spring 7 of the first eyepiece outer cylinder 6 , Second eyepiece barrel 9
2 is engaged with the second engagement groove 9b provided in FIG.
And different.

That is, (1) the head 8 of the second cam screw 8
a moves from one end 9d of the cam groove 9c to the other end 9e, and (2) the protrusion 7a of the second leaf spring 7 moves from the position of the first engagement groove 9a of the second ocular outer cylinder 9 to the first position. The movement from the state of FIG. 2 to the state of FIG. 4 is performed by moving to the position of the 2 engagement groove 9b. In other words, the first eyepiece barrel 6 does not rotate, and only the second eyepiece barrel 9 rotates counterclockwise. As a result, the eye cover 10 is extended by the distance of (L2−L1). .

Further, a description will be given of the state from the state shown in FIG. 3 to the state shown in FIG. 5 (state in which the target cover is further extended by one step). In FIG. 5, the distance between the last optical surface S of the eyepiece 3 and the tip end T of the eye cover 10 is indicated by L3, and has a relationship of L3>L2> L1. Referring to FIG. 6, the head 8a of the second cam screw 8 is
Contacting one end 9e of the cam groove 9c of the
The projection 7a of the second leaf spring 7 of the eyepiece outer cylinder 6 is
This is the same as FIG. 4 in that it is engaged with the second engagement groove 9b. However, that the head 5a of the first cam screw 5 is in contact with one end 6e of the cam groove 6c of the first eyepiece outer cylinder 6,
4 in that the projection 4a of the first leaf spring 4 of the eyepiece lens holding cylinder 2 is engaged with the second engagement groove 6b of the first eyepiece outer cylinder 6.

That is, (1) the head 5 of the first cam screw 5
a moves from one end 6d of the cam groove 6c to the other end 6e, and (2) the protrusion 4a of the first leaf spring 4 moves from the position of the first engagement groove 6a of the first eyepiece outer cylinder 6 to the first position. The movement from the state of FIG. 4 to the state of FIG. 6 is performed by moving to the position of the two engagement grooves 6b. In other words, the first eyepiece outer cylinder 6 rotates counterclockwise, and as a result, the eye cover 10 is extended by the distance of (L3-L2).

After all, the distance that the target cover is extended by one step is (L2-L1), and the distance that is further extended by one step is (L3-L2). Therefore, the total distance that is extended is (L3-L1). Become.

The aiming mechanism of the present invention has a multi-stage pay-out or pay-in operation, and the pay-out or feed-in sequence is operated by the following mechanism. In the present embodiment, a two-stage aiming mechanism will be described.

FIG. 7 is a side view for explaining a cam groove provided in the second eyepiece outer cylinder. In the drawing, when the head of the cam screw relatively moves from a position contacting 9d of the cam groove 9c to a position contacting 9e of the cam groove 9c, the eye cover 10 moves the distance (L).
It moves along the optical axis direction by 2-L1). Cam groove 9c
Is formed substantially perpendicular to the optical axis at one end (in the vicinity of 9e), so that when the head of the cam screw is in contact with 9e, even if force is applied to the eye cover in the optical axis direction, The two-piece outer cylinder 9 does not move.

FIG. 8 is a side view for explaining a cam groove provided in the first eyepiece outer cylinder. In the drawing, when the head of the cam screw relatively moves from a position contacting 6d of the cam groove 6c to a position contacting 6e of the cam groove 6c, the eye cover 10 moves the distance (L).
3-L2) along the optical axis direction. Cam groove 6c
Is formed in a direction substantially perpendicular to the optical axis at one end (in the vicinity of 6e), so that when the head of the cam screw is in contact with the 6e, even if a force is applied to the eye cover in the optical axis direction, The one eyepiece outer cylinder 6 does not move.

Although FIGS. 7 and 8 show a spiral cam groove oblique to the optical axis direction, other cam grooves (linear grooves) parallel to the optical axis direction may be used. Good.
Also in this straight groove, one end is formed in a direction substantially perpendicular to the optical axis.

Referring again to FIGS. 2, 4 and 6, the click mechanism used in the eye-catching mechanism of the present invention will be described in detail. In FIG. 2, the force of the projection 4a of the first leaf spring 4 coming off the first engagement groove 6a and the second engagement groove 6b of the first eyepiece outer tube 6 is F1, and the projection 7a of the second leaf spring 7 is the second force. F2 is the force disengaged from the first engagement groove 9a and the second engagement groove 9b of the eyepiece outer cylinder 9, and the projection 7a of the second leaf spring 7 is the first engagement groove 9a and the second engagement groove 9
After deviating from b, the force for urging the inner peripheral surface of the second eyepiece outer cylinder 9 is defined as F3. At this time, the urging forces of the first leaf spring and the second leaf spring are set so that F1> F2 and F1> F3. The biasing force is designed in consideration of the size and shape of the leaf spring, the elastic constant, and the size and shape of the engagement groove.

When the eye cover 10 is rotated around the optical axis from the state shown in FIG. 2, first, the projection 7a of the second leaf spring 7
It comes off from the first engagement groove 9a, slides while urging the inner peripheral surface of the second eyepiece outer cylinder 9, and engages with the second engagement groove 9b. At this time, the head 8a of the second cam screw 8 reaches a position in contact with 9e of the cam groove 9c. Further, when the eye cover 10 is rotated about the optical axis from the state shown in FIG. 4, the projection 4a of the first leaf spring 4 is disengaged from the first engagement groove 6a of the first eyepiece outer cylinder 6, and the first eyepiece outer cylinder 6 is slid while urging the inner peripheral surface thereof to engage with the second engagement groove 6b. At this time, the head 5a of the first cam screw 5
Reaches a position in contact with 6e of the cam groove 6c.

When the eye cover 10 is rotated around the optical axis by the above-described cam mechanism and click mechanism, the first eyepiece outer cylinder 6 and the second eyepiece outer cylinder 9 do not rotate together, and the state shown in FIG. The state shifts to the state shown in FIG. 6, that is, the state in which the eye cover 10 is extended in two steps via the state 4.

The state shown in FIG. 6 can be returned to the state shown in FIG. 2 by reversely rotating the eye cover 10 around the optical axis.
Since the biasing force is set to satisfy F1> F2, first the second
The projection 7a of the leaf spring 7 is disengaged from the second engagement groove 9b,
It slides while urging the inner peripheral surface of the eyepiece outer cylinder 9 and engages with the first engagement groove 9a. At this time, the head 8a of the second cam screw 8
Returns to the position in contact with 9d of the cam groove 9c. Further, when a reverse rotation is performed by applying a force, the projection 4a of the first leaf spring 4 is formed.
Is disengaged from the second engagement groove 6b of the first eyepiece outer cylinder 6, slides while urging the inner peripheral surface of the first eyepiece outer cylinder 6, and
a. At this time, the head 5a of the first cam screw 5
It returns to the position in contact with 6d of the cam groove 6c.

In the above-described embodiment, the urging forces of the first leaf spring and the second leaf spring are set so as to satisfy F1> F2 and F1> F3. Conversely, the urging forces of F2> F1 and F2> F4 are satisfied. It can also be set to be. Here, F4 is such that the projection 4a of the first leaf spring 4 has the first engagement groove 6a and the second engagement groove 6a.
This force urges the inner peripheral surface of the first eyepiece outer cylinder 6 after coming off from b. With this setting, when the eye cover 10 is rotated around the optical axis from the state of FIG. 2, first, the inner first eyepiece outer cylinder 6 moves along the optical axis direction, and further applies a force. When rotated, the second eyepiece barrel 9 moves.

In the above-described embodiment, the two-stage feeding is described. However, the feeding is performed by the same mechanism in the feeding of three or more stages.

[0032]

As described above, according to the eyepiece mechanism of the present invention, a long feeding amount can be obtained even if the diameter of the eyepiece outer cylinder is small. That is, if the diameter of the eye cover is the same as that of the conventional product, a longer feeding amount can be obtained, so that the present invention can be applied to a compact optical device in which the slide eye cannot be conventionally provided.

Further, since the number of positions that can be securely fixed increases by performing the feeding in multiple stages, it is possible to finely adjust the position of the eye cover so as to fit eyes of many people with different eye reliefs. Become.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view showing a state in which eye-loading is performed in an eye-weight mechanism according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is a vertical cross-sectional view showing a state in which the eyepiece is extended by one stage in the eyepiece mechanism according to the embodiment of the present invention.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a longitudinal sectional view showing a state in which the eyepiece is further advanced by one step in the eyepiece mechanism according to the embodiment of the present invention.

FIG. 6 is a sectional view taken along the line CC of FIG. 5;

FIG. 7 is a side view showing a cam groove provided in a second eyepiece outer cylinder of the eyepiece mechanism according to the embodiment of the present invention.

FIG. 8 is a side view showing a cam groove provided in a first eyepiece outer cylinder of the eyepiece mechanism according to the embodiment of the present invention.

FIG. 9 is a vertical cross-sectional view showing a state in which the eyepiece is retracted in the conventional eyepiece mechanism.

FIG. 10 is a vertical cross-sectional view showing a state where an eyepiece is extended in a conventional eyepiece mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical device main body 2 Eyepiece holding cylinder 3 Eyepiece 4 First leaf spring 5 First cam screw 6 First eyepiece outer cylinder 6a First engagement groove of first eyepiece outer cylinder 6b Second engagement of first eyepiece outer cylinder Groove 6c Cam groove of first eyepiece barrel 6d One end of cam groove of first eyepiece barrel 6e The other end of cam groove of first eyepiece barrel 7 Second leaf spring 8 Second cam screw 9 Second eyepiece Cylinder 9a First engagement groove of second eyepiece outer cylinder 9b Second engagement groove of second eyepiece outer cylinder 9c Cam groove of second eyepiece outer cylinder 9d One end of cam groove of second eyepiece outer cylinder 9e Second The other end of the cam groove of the eyepiece barrel 10 Eye cover E Eye of observer S Last optical surface of eyepiece T Tip of eye cover

Claims (5)

[Claims] 1. A plurality of eyepiece outer cylinders having a multiplex structure including an eyepiece holding cylinder for housing and holding an eyepiece, and an innermost eyepiece outer cylinder slidable with an outer peripheral portion of the eyepiece holding cylinder; An eye cover fixed to an outer peripheral portion of an outermost eyepiece outer cylinder among the plurality of eyepiece outer cylinders, an eyepiece mechanism for an optical apparatus, the plurality of eyepiece outer cylinders each having the eyepiece cover; An eyepiece mechanism for an optical device, comprising: a movement mechanism slidable with an outer peripheral portion of an eyepiece holding cylinder or an eyepiece outer cylinder located inside each of the eyepieces so as to move the eyepiece in the optical axis direction. . 2. The eyepiece mechanism according to claim 1, wherein the moving mechanism includes a cam groove provided in each of the plurality of eyepiece barrels and an eyepiece positioned inside each of the plurality of eyepiece barrels. A cam mechanism engaged with a cam pin fixed to the holding cylinder or the eyepiece outer cylinder, and an engagement groove provided in each of the plurality of eyepiece outer cylinders and located inside each of the plurality of eyepiece outer cylinders An eyepiece mechanism for an optical device, comprising: a click mechanism for urgingly engaging an elastic member fixed to the eyepiece holding cylinder or the eyepiece outer cylinder. 3. The eyepiece mechanism according to claim 2, wherein one end of a cam groove provided in each of the plurality of eyepiece outer cylinders is formed in a direction perpendicular to an optical axis direction. Mechanism for optical equipment. 4. The eyepiece mechanism according to claim 2, wherein the biasing force of the elastic member has the smallest force on the outermost eyepiece outer cylinder, and the innermost eyepiece outer cylinder has a smaller force on the eyepiece outer cylinder. An eyepiece mechanism for an optical device characterized by being sequentially increased in size. 5. The eyepiece mechanism according to claim 2, wherein the biasing force of the elastic member has the largest force on the outermost eyepiece outer cylinder, and the more the innermost eyepiece outer cylinder has a stronger force on the eyepiece outer cylinder. An eyepiece mechanism for an optical device, characterized in that it is sequentially reduced in size.