JP2022117037A - Optical device - Google Patents

Abstract

To provide an optical device capable of suppressing deterioration of optical performance after an impact is applied.SOLUTION: An optical device includes a first lens barrel holding a first lens, a second lens barrel holding a second lens, a third lens barrel holding a third lens arranged between the first and second lens, a first guide member guiding the first lens barrel, a second guide member guiding the second lens barrel, and an elastic member biasing a plurality of contact portions in contact with regulation portions provided on a fixed member toward the fixed member. A gap is formed among a plurality of facing surfaces that are provided on the plurality of contact portions and the fixed member and face the regulation portions, and the elastic member bias a first contact portion having a phase closest to a straight line connecting the first guide member and an optical axis so as to shorten a distance between the first and third lens barrels and bias a second contact portion having a phase closest to a straight line connecting the second guide member and the optical axis so as to shorten a distance between the second and third lens barrels, among the plurality of contact portions.SELECTED DRAWING: Figure 1

Description

The present invention relates to an optical device that drives a lens along the optical axis.

Conventionally, optical devices such as digital cameras and interchangeable lenses, in which the lens barrel is driven in a predetermined direction by an actuator for autofocus operation functions, etc., are known. may overshoot. Patent Literature 1 discloses a device that suppresses overshoot by controlling acceleration.

JP 2020-86166 A

However, the device of Patent Document 1 cannot suppress the influence of unexpected driving of the lens barrel when an impact is applied. In particular, if the lens is held by a member with which the lens barrel collides when an impact is applied, the impact of the collision may change the optical performance.

An object of the present invention is to provide an optical device capable of suppressing deterioration of optical performance after being subjected to impact.

An optical instrument as one aspect of the present invention includes a first lens barrel that holds a first lens movably in the optical axis direction, and a second lens barrel that holds a second lens movably in the optical axis direction. a lens barrel; a third lens barrel that holds a third lens arranged between the first lens and the second lens; and a third lens barrel that guides the first lens barrel in the optical axis direction. 1 guide member, a second guide member for guiding the second lens barrel in the optical axis direction, a fixed member having an optical axis direction regulating portion, and a light guide member for adjusting the third lens barrel. a plurality of contact portions that contact the axial direction restricting portion; and an elastic member that biases the plurality of contact portions against the fixed member in the optical axis direction. , and a plurality of opposing surfaces facing the optical axis direction regulating portion. The first contact portion with the closest phase is urged so that the distance between the first lens barrel and the third lens barrel is shortened, and the straight line connecting the second guide member and the optical axis is closest to the first contact portion. It is characterized by urging the second abutting portion with a close phase so that the distance between the second lens barrel and the third lens barrel becomes closer.

ADVANTAGE OF THE INVENTION According to this invention, the optical apparatus which can suppress the deterioration of the optical performance after an impact is given can be provided.

1 is a front view of an optical instrument according to an embodiment of the invention; FIG. It is a rear view of an optical device. 1 is a front view of an optical device; FIG. It is a side view of an optical instrument. 4 is a cross-sectional view taken along line CC of FIG. 3; FIG. It is a side view of an optical instrument. 4 is a cross-sectional view taken along line BB of FIG. 3; FIG. FIG. 4 is a cross-sectional view taken along line AA of FIG. 3;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same reference numerals are given to the same members, and overlapping descriptions are omitted.

FIG. 1 is a front view of a lens barrel, which is an example of an optical device according to an embodiment of the present invention, showing members other than a fixing member 104. FIG. FIG. 2 is a rear view of the optical device, showing members other than the fixing member 104. FIG. FIG. 3 is a front view of the optical instrument. FIG. 4 is a side view of the optical instrument. 5 is a cross-sectional view taken along line CC of FIG. 3. FIG. FIG. 6 is a side view of the optical instrument. 7 is a cross-sectional view taken along the line BB of FIG. 3. FIG. 8 is a cross-sectional view taken along the line AA of FIG. 3. FIG.

The first lens 100 is held by a first lens barrel 101 so as to be movable in the optical axis direction. A guide member (first guide member) 102 and a guide member (sub-guide bar) 103 are arranged along the optical axis direction and held by a fixing member 104 . The guide member 102 is fitted into fitting holes provided at two locations on the front and rear sides of the first lens barrel 101 in the optical axis direction. The guide member 103 engages with a notch shape formed in the first lens barrel 101 . The first lens barrel 101 is guided (guided) by guide members 102 and 103 and is movable in the optical axis direction. Further, the first lens barrel 101 is restricted from rotating about the guide member 102 by the guide member 103 .

The second lens 105 is held by a second lens barrel 106 so as to be movable in the optical axis direction. A guide member (second guide member) 107 is arranged along the optical axis direction and held by a fixing member 104 . The guide member 107 is fitted in two fitting holes provided in the front and rear of the second lens barrel 106 in the optical axis direction. The guide member 103 engages with a notch shape formed in the second lens barrel 106 . The second lens barrel 106 is guided by guide members 103 and 107 and is movable in the optical axis direction. Further, the second lens barrel 106 is restricted from rotating about the guide member 107 by the guide member 103 .

By sharing the member (guide member 103) for restricting the rotation of the first lens barrel 101 and the second lens barrel 106, space saving is realized.

The actuator 108 is connected to the first lens barrel 101 and moves the first lens barrel 101 in the optical axis direction. The actuator 109 is connected to the second lens barrel 106 and moves the second lens barrel 106 in the optical axis direction. In this embodiment, the actuators 108, 109 are linear ultrasonic motors.

The first restricting portion 110 is provided on the fixed member 104 and restricts movement of the first lens barrel 101 . The second restricting portion 111 is provided on the fixed member 104 and restricts movement of the first lens barrel 101 . By providing the first restricting portion 110 and the second restricting portion 111, the first lens barrel 101 and the second lens barrel 106 move more than expected when an impact is applied to the optical device. can be suppressed. The first restricting portion 110 and the second restricting portion 111 are arranged in phase near the guide members 102 and 107 .

A third lens 112 is arranged between the first lens 100 and the second lens 105 and held by a third lens barrel 113 . A plurality of contact portions 114a, 114b, and 114c are fixed to the third lens barrel 113 with screws. A plurality of contact portions 114 a , 114 b , 114 c are in contact with optical axis direction regulation portions 115 a , 115 b , 115 c provided on the fixed member 104 . The plurality of abutting portions 114a, 114b, and 114c are eccentric rollers in which the axes of the third lens barrel 113 and the portions abutting on the optical axis direction regulating portions 115a, 115b, and 115c are deviated. be. The third lens barrel 113 is adjusted by a plurality of contact portions 114a, 114b, and 114c. Specifically, the adjustment of the third lens barrel 113 is at least one of lens interval adjustment, eccentricity adjustment, and inclination adjustment. The elastic members 116a, 116b, and 116c urge the plurality of contact portions 114a, 114b, and 114c against the fixing member 104 in the optical axis direction. Small gaps are formed between the plurality of contact portions 114a, 114b, 114c and the plurality of opposing surfaces 117a, 117b, 117c provided on the fixed member 104 and opposed to the optical axis direction regulation portions 115a, 115b, 115c. It is

The elastic members 116a, 116b, and 116c are installed obliquely with respect to the optical axis direction so as to generate biasing forces in the circumferential direction and the optical axis direction of the optical device. The position of the third lens barrel 113 in the direction perpendicular to the optical axis is restricted by the circumferential biasing force of the elastic members 116a, 116b, and 116c. In addition, by rotating the contact portions 114a, 114b, and 114c while being urged in the optical axis direction by the elastic members 116a, 116b, and 116c, the inclination of the third lens barrel 113 with respect to the fixed member 104 is changed. .

The elastic member 116a is arranged so that the contact portion (first contact portion) 114a of the phase closest to the straight line connecting the guide member 102 and the optical axis is positioned between the first lens barrel 101 and the third lens barrel 113. Force the distance closer. In addition, the elastic member 116b is arranged such that the contact portion (second contact portion) 114b having the phase closest to the straight line connecting the guide member 107 and the optical axis is connected to the second lens barrel 106 and the third lens barrel 113. is biased so that the distance between the

When an impact is applied to the optical device, the first lens barrel 101 may collide with the first restricting portion 110 . After colliding with the first restricting portion 110, the phase on the straight line connecting the guide member 102 of the first lens barrel 101 and the optical axis overshoots in the direction of the arrow in FIG. As a result, the first lens barrel 101 may collide with the adjacent third lens barrel 113 . In this case, the impact force is stronger than the biasing force of the elastic member 116a in the optical axis direction, and the contact portion 114a collides with the opposing surface (first opposing surface) 117a facing the optical axis direction restricting portion 115a. At this time, since the portion of the contact portion 114a that collides with the facing surface 117a is different from the portion that contacts the optical axis direction regulation portion 115a used for adjustment, even if the contact portion 114a is deformed, the effect on the adjustment is small. . Furthermore, after the impact is applied to the optical device, the contact portion 114a returns to the state of contacting the optical axis direction regulation portion 115a due to the biasing force of the elastic member 116a. changes are unlikely to occur.

Also, if an impact is applied to the optical device in a direction different from the impact described above, the second lens barrel 106 may collide with the second restricting portion 111 . After colliding with the second restricting portion, the phase on the straight line connecting the guide member 107 of the second lens barrel 106 and the optical axis overshoots in the direction of the arrow in FIG. As a result, the second lens barrel 106 may collide with the adjacent third lens barrel 113 . In this case, the impact force is stronger than the biasing force of the elastic member 116b in the optical axis direction, and the contact portion 114b collides with the opposing surface (second opposing surface) 117b facing the optical axis direction restricting portion 115b. At this time, since the portion of the contact portion 114b that collides with the facing surface 117b is different from the portion that contacts the optical axis direction regulation portion 115b used for adjustment, even if the contact portion 114b is deformed, the effect on the adjustment is small. . Furthermore, after the impact is applied to the optical device, the contact portion 114b returns to the state of contacting the optical axis direction regulation portion 115b due to the biasing force of the elastic member 116b. changes are unlikely to occur.

With the above-described configuration, it is difficult for the tilting of the third lens barrel 113 to change due to the impact regardless of the direction of the impact applied to the optical device.

With the configuration described above, it is possible to provide an optical device capable of suppressing deterioration of optical performance after being subjected to impact.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist.

100 First lens 101 First lens barrel 102 Guide member (first guide member)
104 fixing member 105 second lens 106 second lens barrel 107 second guide member 112 third lens 113 third lens barrel 114a, 114b, 114c a plurality of contact portions 115a, 115b, 115c optical axis Direction restricting portions 116a, 116b, 116c Elastic members 117a, 117b, 117c Plural opposing surfaces

Claims (7)

a first lens barrel that holds the first lens movably in the optical axis direction;
a second lens barrel that holds a second lens movably in the optical axis direction;
a third lens barrel holding a third lens arranged between the first lens and the second lens;
a first guide member that guides the first lens barrel in the optical axis direction;
a second guide member that guides the second lens barrel in the optical axis direction;
a fixing member provided with an optical axis direction regulating portion;
a plurality of abutting portions abutting against the optical axis direction restricting portion for adjusting the third lens barrel;
an elastic member that biases the plurality of abutment portions toward the fixing member in the optical axis direction;
gaps are formed between the plurality of contact portions and the plurality of opposing surfaces provided on the fixed member and facing the optical axis direction regulation portion;
The elastic member selects a first contact portion having a phase closest to a straight line connecting the first guide member and the optical axis, among the plurality of contact portions, between the first lens barrel and the third contact portion. and a second contact portion having a phase closest to a straight line connecting the second guide member and the optical axis, with the second lens barrel. An optical apparatus characterized in that it is biased so that the distance to the third lens barrel is reduced. 3. The fixing member includes a first restricting portion that restricts movement of the first lens barrel, and a second restricting portion that restricts movement of the second lens barrel. 2. The optical instrument according to 1. 3. The optical device according to claim 1, wherein the elastic member generates an urging force in the circumferential direction of the optical device and in the optical axis direction. 4. The adjustment of the third lens barrel by the plurality of contact portions is at least one of lens interval adjustment, eccentricity adjustment, and inclination adjustment. The optical instrument described in . 5. The optical apparatus according to any one of claims 1 to 4, further comprising a sub-guide bar for restricting circumferential rotation of the first lens barrel and the second lens barrel. 6. The optical apparatus according to claim 1, wherein the plurality of contact portions are fixed to the third lens barrel. When an impact force stronger than the biasing force of the elastic member acting on the first contact portion is applied to the optical device, the first contact portion collides with the first opposing surface among the plurality of opposing surfaces. death,
When an impact force stronger than the biasing force of the elastic member acting on the second contact portion is applied to the optical device, the second contact portion collides with the second opposing surface among the plurality of opposing surfaces. 7. The optical instrument according to any one of claims 1 to 6, characterized in that:

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