JPH11174301A - Lens device and optical apparatus having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust the eccentricity of a lens in a short time while confirming the final performance considering the whole lens system state by performing the positional adjustment from the outside of a lens barrel in the state that lens holding members are assembled at a normal position in the lens barrel. SOLUTION: In the lens device having lens holding means 4 and 3 for holding lenses in a lens barrel, exposed parts 16a, 16b, 17a and 17b to be exposed outside the lens barrel provided on the lens holding means and by imparting an adjusting force on the exposed parts from the outside of the lens barrel, the positional adjustment of the lens holding means is performed in a direction orthogonal to the optical axis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens device (lens barrel) used for optical equipment such as a camera and observation equipment.

[0002]

2. Description of the Related Art Conventionally, lens groups in a lens barrel are held and fixed in respective lens group holders, and then positioned by positioning pins or the like provided on the respective lens group holders. Are determined in the orthogonal direction.

However, in the above conventional example, the accuracy of each positioning pin is limited, and it is difficult to guarantee the coaxiality of each lens group due to the accumulation of the positioning pin tolerance.

In recent years, the sensitivity of eccentricity of each lens group has increased due to the miniaturization of the lens system, and the amount of eccentricity allowed for each lens group has reached a level of several μm. In order to satisfy this level of eccentricity, in the conventional lens holding method using positioning pins, the eccentricity between the lens groups exceeds the allowable eccentricity and satisfies the required optical performance. The problem that things cannot be done has occurred.

In order to avoid this problem,
The eccentricity adjustment is performed on the lens group having high eccentric sensitivity to satisfy the desired optical performance.

[0006]

However, when the lens group to be adjusted is the front group or the rear group, the eccentricity can be adjusted while passing through the entire lens system. If it is located in the middle of the system, the lens barrel structure for adjustment becomes complicated and the cost increases. For this reason, when the lens group to be adjusted is located in the middle of the optical system, the lens group to be adjusted is temporarily placed at the front group position using another dummy optical system, and after the eccentricity adjustment, the predetermined optical I was taking a method of attaching it to the system. For this reason, there is a problem that the eccentricity cannot be adjusted while confirming the final performance while passing through the entire lens system. In addition, there is a problem that the time required for the eccentricity adjustment is very long.

[0007]

Accordingly, in the present invention,
In a lens apparatus having a lens holding means for holding a lens in a lens barrel, an exposure portion exposed to the outside of the lens barrel is provided in the lens holding means, and an adjusting force is applied to the exposed portion from outside the lens barrel to hold the lens. The position is adjusted in a direction (diameter direction of the lens barrel) orthogonal to the optical axis of the means.

Specifically, the lens holding member is provided with a first exposure portion for adjusting the position of the lens holding member in a predetermined direction out of a direction orthogonal to the optical axis and the predetermined direction out of a direction orthogonal to the optical axis. It is desirable to provide a second exposed portion for adjusting the position in a direction orthogonal to.

[0009] This makes it possible to adjust the position of the lens holding member from the outside of the lens barrel in a state where the lens holding member is installed at a proper position in the lens barrel. The eccentricity adjustment of the lens can be performed in a short time.

The lens holding member may be simply and inexpensively configured as an integral member having first and second exposed portions. However, the position adjustment is performed only in the predetermined direction by having the first exposed portion. The first member holds the lens and is connected to the first member so that the position can be integrally adjusted in the predetermined direction. The second member has a second exposed portion, and the position is adjusted only in a direction orthogonal to the predetermined direction. And a second member. Accordingly, the position of the second member holding the lens is adjusted in a predetermined direction via the first member to which the adjusting force is applied to the first exposed portion, while the adjusting force is applied to the second exposed portion. Although the position is adjusted in a direction orthogonal to the predetermined direction, it is possible to prevent the second member from being minutely displaced in the orthogonal direction at the time of adjusting the position of the second member in the predetermined direction via the first member. The eccentricity adjustment of the lens can be performed more easily and in a shorter time.

In the above invention, the projection for receiving the abutment of the position adjusting jig is provided on each exposed portion, so that even when each exposed portion is smaller than the abutting portion of the position adjusting jig, it is easy. Eccentricity adjustment can be performed.

Further, the lens holding means is positioned between the two fixing members constituting the lens barrel to perform positioning in the optical axis direction. In this case, one of the fixing members is charged by the lens holding means. It is desirable to provide an elastic portion that abuts on the base member and press it against the reference surface of the other fixed member so that positioning in the optical axis direction can be performed more reliably.

[0013] Further, the lens holding means has a shape having the elastic portion near the outer end of the arm-shaped portion extending in the lens barrel radial direction and having the exposed portion at the outer end of the arm-shaped portion. A lean shape can be achieved in the lens holding means that requires axial positioning and position adjustment in a direction perpendicular to the optical axis.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIGS. 1 to 5 show a lens barrel (lens device) according to a first embodiment of the present invention. The lens barrel is used for various optical devices such as a camera and an observation device.

In these figures, reference numeral 1 denotes a fixed lens barrel (a fixed member 1 in the claims) for holding the first lens group.
2) a variator moving ring for holding the zoom lens group, and 3 an afocal ring (second member in the claims) for holding the afocal lens. Reference numeral 4 denotes an adjustment ring (a first member in the claims), 5 denotes an RR moving ring for holding a focusing lens, and 6 denotes a relay holder for holding a CCD (not shown) serving as an image sensor at a rear end portion. One of the fixing members).

Reference numerals 7a and 7b denote guide bars which hold the variator moving ring 2 and the RR moving ring 5, which are moving lens frames, so as to be movable in the optical axis direction. Fixed lens barrel 1 and relay holder 6
Are positioned in a direction orthogonal to the optical axis by two pairs of positioning pins and are fixed by screws. Guide bars 7a, 7b
Is held between the fixed lens barrel 1 and the relay holder 6 and holds the two movable rings 2 and 5. In the optical system configured as described above, the eccentricity sensitivity is very low with the afocal lens. Therefore, it is necessary to adjust the eccentricity of the afocal lens. Therefore, guide pins 8a, 8b extending in the optical axis direction are formed in the relay holder 6, and elongated holes 9a, 9b extending in a predetermined direction (direction of arrow A) of the direction orthogonal to the optical axis are formed in the adjustment ring 4, By fitting them together, the position of the adjustment ring 4 can be adjusted with respect to the relay holder 6 only in the direction of arrow A. Further, guide pins 10a and 10b extending in the optical axis direction are formed on the adjustment ring 4, and the elongate holes extending in the afocal ring 3 in the direction orthogonal to the optical axis in the direction orthogonal to the predetermined direction (the direction of arrow B). 11a, 11b
And by fitting them together, the afocal ring 3 can be adjusted with respect to the adjustment ring 4 only in the direction of arrow B, and can be integrally adjusted with the adjustment ring 4 in the direction of arrow A. ing.

The adjusting ring 4 is formed with two arm-shaped portions extending in the direction of arrow A. Elastic contact portions 12a and 12b extending toward the fixed lens barrel 1 are provided near the outer ends of these arm-shaped portions. Are formed. The afocal ring 3 is formed with two arm-shaped portions extending in the direction of arrow B. Elastic contact portions 14a and 14b extending toward the fixed lens barrel 1 are provided near the outer ends of these arm-shaped portions. Is formed.

Then, as shown in FIGS. 4 and 5, the adjusting ring 4 and the afocal ring 3 are arranged so as to be sandwiched between the fixed lens barrel 1 and the relay holder 6 when the lens barrel is assembled. The parts 12a, 12b, 14a, and 14b are pressed against the fixed lens barrel 1 to charge, and the relay holder 6 is charged.
The adjustment ring 4 is pressed against the reference surfaces 13a to 13d provided at the same time, and the afocal ring 3 is pressed against the reference surfaces 15a to 15d, thereby positioning the adjustment ring 4 and the afocal ring 3 in the optical axis direction. .

Further, at the outer ends of the arm-shaped portions of the adjusting ring 4 and the afocal ring 3, projections (parts of exposed portions) 16a, 16 projecting outward are provided.
b, 17a and 17b are formed. These projections 16
As shown in FIGS. 2 to 5, a, 16 b, 17 a, and 17 b are exposed to the outside of the barrel through an adjustment opening 1 a formed by cutting out a joint portion of the outer periphery of the fixed barrel 1 with the relay holder 6. .

Therefore, as shown in FIG. 6, the assembled lens barrel is set in the adjusting jig 18, and the protrusions 16a and 16b of the adjusting ring 4 are attached to the micrometer 19a attached to the adjusting jig 18. When the micrometer 19a is caused to protrude or retract by being brought into contact with the damper 20a and the afocal ring together with the adjustment ring 4 by the protruding operation force (adjustment force) of the micrometer 19a or the extension force (adjustment force) of the damper 20a. 3 (that is, the afocal lens group) can be adjusted in the direction of arrow A.

At this time, since the movement of the adjusting ring 4 is restricted in a direction other than the direction of the arrow A by fitting the elongated holes 9a, 9b with the guide pins 8a, 8b, the afocal movement through the adjusting ring 4 is performed. When the position of the ring 3 is adjusted in the direction of the arrow A, the adjustment ring 4 and the afocal ring 3 are not displaced in the direction of the arrow B.

The projections 17a, 1 of the afocal ring 3
When the micrometer 19b is brought into contact with the micrometer 19b attached to the adjustment jig 18 and the damper 20b and the micrometer 19b is protruded or retracted, the protruding operation force (adjustment force) of the micrometer 19b or the damper 20b is reduced. The position of the afocal ring 3 (that is, the afocal lens group) can be adjusted in the direction of arrow B by the extension force (adjustment force).

The micrometers 19a, 19b and the dampers 20a, 20b are connected to the projections 16a, 16b, 17 respectively.
Since the contact portions a and 17b are contacted, eccentricity adjustment can be easily performed even when the contact portion of the micrometer or the damper is larger than the adjustment opening 1a.

As described above, according to the present embodiment, the afocal ring 3 is assembled at a regular position in the lens barrel (between the fixed lens barrel 1 and the relay holder 6) and positioned in the optical axis direction. Since it becomes possible by adjusting the position from outside the cylinder, it is possible to adjust the eccentricity of the afocal lens group in a short time while confirming the final performance while passing through the entire lens system.

(Second Embodiment) FIG. 7 shows a second embodiment of the present invention.
This embodiment has a lens barrel (which shows a lens device. This embodiment has components common to the first embodiment, and common components are denoted by the same reference numerals as those of the first embodiment. And replace it with the description.

In the first embodiment, the eccentricity of the afocal lens group is adjusted by adjusting the positions of the adjustment ring 4 and the afocal ring 3, respectively. In the present embodiment, only the afocal ring 3 is used. Is adjusted so that the eccentricity of the afocal lens group can be adjusted.

Specifically, the afocal ring 73 is provided with two arm-shaped portions extending in a predetermined direction (direction of arrow A) in a direction perpendicular to the optical axis and a direction perpendicular to the predetermined direction (direction of arrow B). Two extending arm-shaped portions are provided, and elastic contact portions 84a to 84d extending toward the fixed lens barrel 1 are formed near the outer ends of the respective arm-shaped portions, and outwardly protruded from the outer ends of the respective arm-shaped portions. Projections 87a to 87d are formed.

In the present embodiment, an afocal ring 73 is provided between the fixed lens barrel 1 and the relay holder 6 when assembling the lens barrel.
Are disposed so as to sandwich the elastic contact portions 84a to 84d.
Is pressed against the fixed lens barrel 1 to charge the afocal ring 73 against the reference surfaces 15a to 15d provided on the relay holder 6, whereby the afocal ring 3 is positioned in the optical axis direction.

Further, the projections 87a to 87d exposed to the outside of the lens barrel through the adjustment opening 1a are brought into contact with the micrometer and the damper of the adjustment jig as described in the first embodiment, so that an afocal point is obtained. Ring 73 is fixed lens barrel 1
The position can be adjusted in the direction of arrow A or the direction of arrow B with respect to the relay holder 6.

Also in this embodiment, the afocal ring 3
It is possible to adjust the position from the outside of the lens barrel while the lens is positioned at the proper position in the lens barrel and positioned in the direction of the optical axis. The eccentricity of the group can be adjusted.

Moreover, in this embodiment, the adjusting ring 4 used in the first embodiment is abolished and the function of the adjusting ring 4 is also provided to the afocal ring 3, so that the number of parts and the cost can be reduced. Can be planned.

It should be noted that the shapes of the first member, the second member, the lens holding member, and the members related to their positioning in the present invention are not limited to those described in the above embodiments.

[0033]

As described above, according to the present invention,
It is possible to adjust the position from the outside of the lens barrel with the lens holding member installed in the proper position in the lens barrel. Alignment can be performed.

A first member whose position is adjusted only in a predetermined direction out of a direction orthogonal to the optical axis, a lens holding member, and an integrated position adjustment of the lens holding member with respect to the first member which is performed in the predetermined direction. And a second member that has a second exposed portion and that can be adjusted only in a direction orthogonal to the predetermined direction.
Since it is possible to prevent the second member from being minutely displaced in a direction orthogonal to the predetermined direction at the time of adjusting the position of the member in the predetermined direction, it is possible to adjust the eccentricity of the lens more easily and in a shorter time.

Further, in the above invention, the projection for receiving the abutment of the position adjusting jig is provided on each exposed portion, so that even when each exposed portion is smaller than the abutting portion of the position adjusting jig, it is easy. Eccentricity adjustment can be performed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a lens barrel according to a first embodiment of the present invention.

FIG. 2 is a front sectional view of the lens barrel.

FIG. 3 is a front sectional view of the lens barrel.

FIG. 4 is an overall sectional view of the lens barrel taken along line CC shown in FIG. 2;

5 is an overall sectional view of the lens barrel taken along line DD shown in FIG. 3;

FIG. 6 is an explanatory diagram of an eccentricity adjusting operation of the lens barrel.

FIG. 7 is an exploded perspective view of a lens barrel according to a second embodiment of the present invention.

FIG. 8 is a sectional view of a lens barrel according to the second embodiment.

[Explanation of symbols]

Reference Signs List 1 fixed lens barrel 2 variator moving ring 3, 73 afocal ring 4 adjusting ring 5 RR moving ring 6 relay holder 7a, 7b guide bar 12a, 12b, 14a, 14b, 84a to 84d elastic contact portions 16a, 16b, 17a, 17b, 87a-87d Projection 18 Adjustment jig 19a, b Micrometer

Claims (8)

[Claims] 1. A lens device having lens holding means for holding a lens in a lens barrel, wherein said lens holding means has an exposed part exposed to the outside of said lens barrel, and said exposed part is provided with said lens barrel. A lens device wherein position adjustment in a direction orthogonal to an optical axis is performed by receiving an adjustment force from the outside. 2. The apparatus according to claim 1, wherein the lens holding member is configured to adjust a position of the lens holding member in a predetermined direction among directions orthogonal to the optical axis, and the predetermined direction in a direction orthogonal to the optical axis. The lens apparatus according to claim 1, further comprising a second exposure portion for adjusting a position in a direction orthogonal to the direction of the lens. 3. The lens holding means includes a first member having the first exposed portion, the position of which is adjusted only in the predetermined direction, and a lens holding the lens and the predetermined position relative to the first member. And a second member having the second exposed portion and having a position adjusted only in a direction orthogonal to the predetermined direction. The lens device according to claim 2, wherein: 4. The lens device according to claim 1, wherein a projection for receiving a contact of a position adjusting jig is provided on the exposed portion. 5. The apparatus according to claim 1, wherein the lens holding means is positioned between two fixing members constituting the lens barrel to perform positioning in the optical axis direction. Lens device. 6. The lens holding means has an elastic portion which comes into contact with one of the two fixing members in a charged state, and presses against a reference surface of the other fixing member. The lens device according to claim 5, wherein 7. The lens holding means has an arm-shaped portion extending in a direction perpendicular to the optical axis, and the elastic portion is formed near an outer end of the arm-shaped portion.
The lens device according to claim 5, wherein the exposed portion is formed at an outer end of the arm-shaped portion. 8. An optical apparatus comprising the lens device according to claim 1.