WO2019065539A1

WO2019065539A1 - Blade-driving device for imaging

Info

Publication number: WO2019065539A1
Application number: PCT/JP2018/035206
Authority: WO
Inventors: 謙三今井; 渡部　伸昭
Original assignee: 日本電産コパル株式会社
Priority date: 2017-09-29
Filing date: 2018-09-21
Publication date: 2019-04-04
Also published as: JPWO2019065539A1

Abstract

A blade-driving device for imaging which has a blade-driving device assembled with a lens frame, and makes it possible to favorably maintain lens performance and to accurately adjust the optical performance of the blade-driving device. A blade-driving device for imaging equipped with a lens frame for holding a plurality of lenses and a blade-driving device to be assembled with the lens frame, wherein: the lens frame is equipped with a slit that corresponds to a gap between two adjacent lenses; a frame body which stores a drive unit and an insertable part which projects from the frame body and is inserted through the slit into the gap between lenses are further provided in the blade-driving device; and the lens frame or lens has a contact surface which projects toward the insertable part side relative to the lens functional part of the lens which is adjacent to the insertable part.

Description

Imaging blade drive

The present invention relates to an imaging blade drive device in which a blade drive device is assembled to a lens frame.

A slit is provided on the side surface of the lens frame, and the insertion portion (base plate) having an opening is projected from the drive portion of the blade drive device, and the lens frame and blade drive device are integrated by inserting this insertion portion into the slit of the lens frame. There is known an imaging blade drive apparatus to be assembled to a vehicle (see Patent Document 1).

In the conventional imaging blade drive device, a blade chamber for slidably holding the diaphragm blade is provided in the insertion portion formed of a pair of base plates, and the insertion portion is inserted between the plurality of lenses held by the lens frame Thus, the opening of the insertion portion is disposed on the optical axis of the plurality of lenses, and the diaphragm blade in the blade chamber is slid by the operation of the drive portion disposed outside the lens frame to control the diaphragm amount. .

Unexamined-Japanese-Patent No. 2017-40814

In such an imaging blade drive apparatus, since the insertion portion is inserted through the gap between the lens and the lens in the lens frame, if the insertion portion contacts the surface of the lens during insertion, the lens is scratched As a result, there is a problem that the lens performance is lowered due to sticking.

Further, since the insertion portion of the blade driving device is a thin member, if interference with the lens or lens frame occurs during insertion, the blade housed in the insertion portion or the insertion portion is deformed or the like. There arises a problem that the optical performance of the driving device can not be maintained with high accuracy.

The present invention is proposed to address such problems. That is, according to the present invention, in the imaging blade drive apparatus in which the blade drive apparatus is assembled to the lens frame, the performance of the lens can be favorably maintained and the optical performance of the blade drive apparatus can be maintained with high accuracy. , Etc. is an issue.

In order to solve such a subject, the present invention comprises the following composition.

A lens frame for holding a plurality of lenses, and a blade drive device assembled to the lens frame, wherein the lens frame comprises a slit corresponding to a gap between two adjacent lenses, and the blade drive device is driven A frame in which the portion is accommodated, and an insertion portion which is inserted from the frame and inserted into the gap by passing through the slit, and the lens function of the lens frame or the lens adjacent to the insertion portion An imaging blade drive device having a contact surface projecting toward the insertion portion with respect to a portion.

BRIEF DESCRIPTION OF THE DRAWINGS The external appearance figure ((a) is a perspective view, (b) is a top view) of the imaging | photography blade drive device which concerns on embodiment of this invention. FIG. 2 is a cross-sectional view (taken along the line AA in FIG. 1B, but the internal structure of the blade drive device is omitted) of the imaging blade drive device according to the embodiment of the present invention. (A) is an example of the lens L3 being a convex lens, (b) is an example of the lens L3 being a concave lens. FIG. 2 is a cross-sectional view of the imaging blade drive device according to the embodiment of the present invention (a cross-sectional view taken along the line BB in FIG. 1B; however, the internal structure of the blade drive device is omitted). It is explanatory drawing which shows the internal structure of a blade drive device. FIG. 6 is a cross-sectional view of an imaging blade drive device according to another embodiment of the present invention (a cross-sectional view taken along the line AA in FIG. 1B; however, the internal structure of the blade drive device is omitted). An explanatory view showing a function of an opening of the insertion portion ((a) is an example in which the lens L3 is a concave lens, and (b) is an example in which the lens L3 is a convex lens). An explanatory view showing a function of an opening of the insertion portion ((a) is an example in which the lens L3 is a concave lens, and (b) is an example in which the lens L3 is a convex lens). It is explanatory drawing which showed the dimensional relationship of the lens space | interval and the insertion part of a blade | wing drive device. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing (cross-sectional view, However, internal structure omission of a blade drive device is shown) which showed the imaging device provided with the imaging blade drive device which concerns on embodiment of this invention. It is explanatory drawing which showed the portable information terminal (portable electronic device) provided with the imaging | photography blade drive device which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same reference numerals in different drawings denote parts having the same functions, and redundant description in each drawing will be appropriately omitted.

As shown in FIGS. 1 to 3, the imaging blade drive device 1 includes a lens frame 2 and a blade drive device 3 assembled to the lens frame 2. The lens frame (lens barrel) 2 holds a plurality of lenses L1 to L5, and is provided with a slit 2S corresponding to the gap between two adjacent lenses L2 and L3. Although the slit 2S is provided between the lens L2 and the lens L3 in the illustrated example, the slit 2S may be provided to correspond to the gap by providing a gap between other adjacent lenses. Good.

The illustrated lens frame 2 includes a front stage 2A that holds the lenses L1 and L2 on the front side of the slit 2S, and a rear stage 2B that holds the lenses L3, L4 and L5 on the rear side of the slit 2S. The stepped portion a is provided on the rear part 2B by making the outer diameter D2 of the rear part 2B larger than the outer diameter D1 of the rear part 2B. Here, the front side is the light incident side of the lens frame 2, and the rear side is the light emission side of the lens frame 2.

Further, in the illustrated lens frame 2, a portion where the pair of slits 2 </ b> S is not provided is a connecting portion 2 </ b> C that connects the front portion 2 A and the rear portion 2 B. The connecting portion 2C has an upper surface parallel to the surface on the step a described above, and the upper surface is a receiving surface b perpendicular to the optical axis O of the lenses L1 to L5.

On the other hand, blade driving device 3 is provided with frame 3A in which a drive part was stored, and insertion part 3B which projected from frame 3A. The insertion portion 3B is a member inserted into the gap between the lens L2 and the lens L3 by passing the slit 2S of the lens frame 2, and may be a blade itself, or a blade housing in which the blade is housed It may be the body. The frame 3A of the blade drive device 3 is provided with a recess c that accommodates a part of the lens frame 2, and the insertion portion 3B protrudes from the recess c.

FIG. 4 shows an example of the internal structure of the blade drive device 3. In the illustrated example, two

blades

30 and 31 are accommodated inside the blade housing 32. The blade housing 32 accommodates the

blades

30, 31 in a thin-walled blade chamber 32S, a part of which is accommodated in the frame 3A, and an insertion portion 3B having an opening d protrudes from the frame 3A.

In the frame 3A, the central portion of the interlocking member 33 is rotatably supported by a shaft 34 provided inside the frame 3A. The interlocking member 33 is provided with an engagement portion (engagement protrusion) 33A at the end of the arm extending to the left and right with respect to the shaft 34, and the engagement portion (A) Engaging projection) 33B is provided.

The interlocking member 33 interlocks the movement of the two

blades

30, 31. The engagement portion 33A at one end is engaged with the engaged portion (engagement hole) 30P of the blade 30, and the other end The engagement portion 33B of the second gear 31 engages with the engagement portion (engagement hole) 31P of the blade 31. Further, the

vanes

30 and 31 respectively have long hole-

like guide holes

30G and 31G extending in the projecting direction of the insertion portion 3B, and the

guide holes

30G and 31G are engaged with the guide protrusions 35 of the frame 3A. It is correct.

The

blades

30 and 31 in the blade driving device 3 shown in FIG. 4 are diaphragm blades, and the

blades

30 and 31 are respectively formed with

diaphragm openings

30A and 31A, and the

diaphragm openings

30A and 31A are in the insertion portion 3B. It is arranged to overlap with the provided opening d. When the interlocking member 33 is rotated clockwise or counterclockwise around the shaft 34 by energization to the drive source, the

blades

30, 31 slide in the opposite directions to each other, and the

diaphragm openings

30A, 31A and the opening d The light transmission area (the amount of transmitted light) overlapping the two is continuously adjusted to be large or small. In the illustrated example, an example is shown in which the

blades

30 and 31 are driven steplessly, but as a form of the drive unit, the blades may be driven stepwise and the blades are driven in a switching manner. It may be one.

Further, in the example of FIG. 4, the

blades

30 and 31 are used as diaphragm blades, but the

blades

30 and 31 may be shutter blades that transmit or block light entering the opening d, or light passing through the opening d It may be an optical filter that selectively adjusts the wavelength and intensity of

The lens frame 2 is provided with a contact surface e that protrudes toward the insertion portion 3B with respect to the lens functional portion Lf of the lenses L2 and L3 that are close to the insertion portion 3B inserted into the slit 2S. FIG. 2A shows an example in which the lens L3 is a convex lens, and a contact surface e is provided in a portion other than the lens functional portion Lf of the lens L3. The contact surface e protrudes further to the insertion portion 3B side than the central portion of the convex lens of the lens functional portion Lf. FIG. 2B shows an example in which the lens L3 is a concave lens, and a contact surface e is provided in a portion other than the lens functional portion Lf of the lens L3. In the illustrated example, the contact surfaces e are provided on the lenses L2 and L3, but the contact surfaces may be provided on the lens frame 2.

When inserting the insertion portion 3B of the blade drive device 3 into the slit 2S of the lens frame 2, the imaging blade drive device 1 as described above slides the lens L2 and the lens while the insertion portion 3B is in sliding contact with the contact surface e described above. It is inserted into the gap with L3. At this time, since the contact surface e protrudes from the lens functional portion Lf of the lenses L2 and L3 toward the insertion portion 3B, the insertion portion 3B does not contact the lens functional portion Lf, and the gap between the lenses L2 and L3 is Be inserted. As a result, it is possible to prevent the problem that the lens performance of the lenses L2 and L3 is degraded by the insertion portion 3B coming into contact with the lens functional portion Lf of the lenses L2 and L3.

Further, the contact surface e is formed so as to protrude inside the interval of the slits 2S. For this reason, when the insertion 3B is inserted while sliding on the contact surface e, it is inserted between the pair of slits 2S without being interfered with the other part while being guided by the contact surface e. At this time, the insertion portion 3B can not only avoid contact with the lens functional portion Lf of the lenses L2 and L3, but also can avoid collision with the edge portion of the slit 2S. As a result, it is possible to suppress such a defect that the

blades

30, 31 accommodated in the insertion portion 3B or the insertion portion 3B are deformed by the collision of the insertion portion 3B, and maintain the optical performance of the blade drive device 3 with high performance. can do.

In addition, the insertion part 3B is not always inserted in the state which contacted the contact surface e. The insertion portion 3B preferably passes through the gap between the lenses L2 and L3 without contacting the contact surface e if possible. The above-described receiving surface b of the lens frame 2 is a part of the frame 3A of the blade driving device 3 so that the insertion portion 3B does not interfere with the adjacent lenses L2 and L3 in the gap between the lenses L2 and L3. I support it. Since the receiving surface b is a surface perpendicular to the optical axis O of the lenses L1 to L5, the inserting portion 3B is inserted into the slit 2S while the frame 3A is supported by the receiving surface b. It moves transversely to O, and passes through the gap between the lenses L2 and L3 in a stable state.

A more specific structural example of the lens frame 2 will be described. As described above, the lens frame 2 shown in FIGS. 2A and 2B includes the front end 2A and the rear end 2B, and the light entrance f is provided at the front end of the front end 2A. A light exit g is provided at the rear end of the lens frame 2, and the inside of the lens frame 2 is a cavity in which the lenses L1 to L5 are held.

Here, in the example shown in FIGS. 2A and 2B, the lenses L1 to L5 are incorporated in the order of L1, L2, L3, L4, L5 from the rear end side (that is, the light exit g side). The direction in which the lenses L1 and L2 are incorporated into the front stage 2A coincides with the direction in which the lenses L3 to L5 are incorporated into the rear stage 2B. In order to incorporate such a lens, the outer diameters (Ld1 to Ld5) of the lenses L1 to L5 have a magnitude relationship of Ld1 <Ld2 <Ld3 <Ld4 <Ld5, and the lenses L1 to L5 are held. For this reason, the inner surface of the lens frame 2 is formed with a stepped portion whose inner diameter gradually decreases from the rear end side (the light emission port g side) to the front end side (the light incident port f side).

On the other hand, in the example shown in FIG. 5, the front stage 2A is incorporated in the order of the lenses L2 and L1, and the rear stage 2B is incorporated in the order of the lenses L3, L4 and L5. That is, the front part 2A incorporates the lenses L2 and L1 from the front end side (light entrance port f side), and the rear part 2B incorporates the lenses L3 to L5 from the rear end side (light exit g side). The direction in which the lenses L2 and L1 are incorporated into the portion 2A and the direction in which the lenses L3 to L5 are incorporated in the rear portion 2B are opposite to each other. In order to incorporate such a lens, the outer diameters (Ld1 to Ld5) of the lenses L1 to L5 have a magnitude relationship of Ld1> Ld2 and Ld3 <Ld4 <Ld5, and the lenses L1 to L5 are held. For this reason, on the inner surface of the lens frame 2, a front end 2A is formed with a stepped portion whose inner diameter gradually decreases from the front end toward the inside, and the rear end 2B is a rear end (a light exit g side). The step is formed in which the inner diameter gradually decreases from the inside to the inside).

6 and 7 show the function of the opening d formed in the insertion portion 3B. In each of the drawings, (a) is an example in which the lens L3 is a concave lens, and (b) is an example in which the lens L3 is a convex lens. In the example shown in FIGS. 6A and 6B, the total aperture diameter of the plurality of lenses L1 to L5 is set by the aperture d formed in the insertion portion 3B. That is, when the diaphragm blade is fully opened, of the light incident from the light entrance f of the lens frame 2, only the light passing through the opening d is condensed on the imaging surface (not shown) by the lenses L1 to L5.

On the other hand, in the example shown in FIGS. 7A and 7B, the full openings of the plurality of lenses L1 to L5 are set other than the opening d formed in the insertion portion 3B. In the illustrated example, the total opening diameter is set by the light entrance f, and when the diaphragm blade is fully opened, all light incident from the light entrance f of the lens frame 2 is collected on the imaging surface (not shown) by the lenses L1 to L5. It will be done.

Here, in the example shown in FIGS. 6 and 7, in FIGS. 6 (a) and 7 (a), the opening d of the insertion portion 3B is inserted at the stop position on the lens design of the lenses L1 to L5. . On the other hand, in FIGS. 6 (b) and 7 (b), the opening d of the insertion portion 3B is inserted at a position other than the diaphragm position in lens design of the lenses L1 to L5. As described above, the insertion portion 3B may be inserted so as to be matched with the lens design stop position of the lens system held by the lens frame 2, or may be inserted at another position. In the case where the insertion portion 3B is inserted at a position other than the diaphragm position in lens design, the captured image is in a state of partially cutting the light beam of the outer periphery, and image correction is appropriately performed as necessary.

As described above, the imaging blade drive device 1 according to the embodiment of the present invention reduces the performance of the lens when inserting the insertion portion 3B of the blade drive device 3 into the gap between the lenses of the lens frame 2 Also, the optical performance of the blade can be maintained with high accuracy. By this, the imaging blade drive device 1 maintaining high optical performance can be obtained.

FIG. 8 shows the relationship between the thickness in the optical axis direction of the internal components of the insertion portion 3B of the blade driving device 3 and the lens interval in which the insertion portion 3B is inserted. In the imaging blade drive device 1 in which the insertion portion 3B of the blade drive device 3 is inserted between the lenses of the two lenses L2 and L3, in terms of the optical design of the lens group, it is desirable to design the lens interval as narrow as possible. Since the insertion portion 3B is to be inserted, the thickness in the optical axis direction of the internal parts of the insertion portion 3B and the lens interval need to be in an appropriate dimensional relationship.

Here, as shown in FIG. 8, let Lt be the lens distance between the front lens L 2 and the rear lens L 3 into which the insertion portion 3 B is inserted, and let the thickness in the optical axis direction of the blade 30 (31) be As shown, when the number of

blades

30 and 31 is two, t1 and t2 and when the number of blades is three, t1 and t2 and t3 respectively, and the space width of the blade chamber 32S in the optical axis direction is r. It is preferable to perform dimension design so that the following relationship is established.

When the number of blades is one (thickness t1);
2 × r ≦ Lt, 3 × r> Lt, 2 × t1 ≦ Lt

When the number of blades is 2 (each thickness t1, t2);
2 × r ≒ Lt, 2 × (t1 + t2) ≒ r

When the number of blades is 3 (each thickness t1, t2, t3);
2 × r> Lt, 2 × (t1 + t2 + t3) ≧ r

In the case where an optical filter is disposed instead of the blade and the optical filter is a filter sandwiched between two protective blades, it is preferable to perform as follows.
2 × r> Lt, 2 × (total thickness of filter and protective blade)> r

When the blade chamber 32S is formed by arranging the intermediate between the pair of plate members, the thickness m of the intermediate in the optical axis direction is the space width r of the blade chamber 32S in the optical axis direction. So, the above relationship can be rewritten as:

When the number of blades is one (thickness t1);
2 × m ≦ Lt, 3 × m> Lt, 2 × t1 ≦ Lt

When the number of blades is 2 (each thickness t1, t2);
2 × m ≒ Lt, 2 × (t1 + t2) ≒ m

When the number of blades is 3 (each thickness t1, t2, t3);
2 × m> Lt, 2 × (t1 + t2 + t3) ≧ m

Further, in the case where an optical filter is disposed instead of the blade and the optical filter is a filter sandwiched by two protective blades, it is preferable to perform as follows.
2 × m> Lt, 2 × (total thickness of filter and protective blade)> m

From the above relationship, set the relationship between the thickness t1, t2 and t3 of the blade in the optical axis direction, the space width r (m) in the optical axis direction of the blade chamber 32S, and the lens interval Lt at which the insertion portion 3B is inserted Thus, the insertion portion 3B can be smoothly inserted between the lenses L2 and L3, and the blades in the blade chamber 32S formed in the insertion portion 3B can be smoothly operated.

FIG. 9 shows an imaging device 100 as an optical unit provided with the imaging blade drive device 1. The blade drive device 3 can be assembled to the lens frame 2 as described above, and mounted on the housing 100A on which the image pickup device 101 is mounted, whereby the imaging storage 100 can be configured. In addition, various types of optical units can be obtained by assembling the blade drive device 3 with other optical components. Such an imaging device 100 or an optical unit can be thinned, and the installation space along the optical axis can be saved. Also, since the blade drive device 3 can be assembled and integrated after adjustment of the lens frame 2 etc., simple and highly accurate adjustment is possible, and a simple mounting in which the blade drive device 3 is integrated. Becomes possible.

FIG. 10 shows a portable electronic device (portable information terminal) 200 provided with the imaging device 100 described above. Although the thickness of a unit mounted inside is severely limited, a portable electronic device 200 such as a smart phone can receive and assemble the blade driving device 3 within the thickness of the lens frame 2. Since the thickness reduction is possible, it can be space-efficiently mounted on the portable electronic device 200 in pursuit of high portability or design.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and changes in design etc. within the scope of the present invention are not limited. Are included in the present invention. In particular, in the embodiment described above, the frame 3A of the blade drive device 3 and the blade housing 32 having the insertion portion 3B are configured as separate members, but the blade housing having the insertion portion 3B integrally with the frame 3A. The body 32 can be configured to separate the drive frame chamber in the frame 3A and the blade chamber of the blade housing 30 by a partition.

1: Imaging blade drive,
2: Lens frame, 2A: front part, 2B: rear part, 2C: connection part,
2S: Slit,
3: Blade drive, 3A: Frame, 3B: Insertion part,
30, 31: blade, 30A, 31A: aperture opening,
30P, 31P: engaged portion (engagement hole), 30G, 31G: guide hole,
32: wing housing, 32S: wing chamber,
33: interlocking member, 33A, 33B: engaging portion (engaging projection), 34: shaft,
35: Guide projection,
L1 to L5: lens, Lf: lens functional portion, a: stepped portion, b: receiving surface,
c: recessed part, d: opening, e: contact surface, f: light entrance, g: light exit,
D1, D2: Outer diameter, O: Optical axis

Claims

A lens frame for holding a plurality of lenses, and a blade driving device assembled to the lens frame;
The lens frame includes a slit corresponding to a gap between two adjacent lenses,
The blade drive device includes a frame in which a drive unit is accommodated, and a plug portion which is inserted into the gap by being protruded from the frame and passing the slit.
The imaging blade drive unit according to claim 1, wherein the lens frame or the lens has a contact surface projecting toward the insertion portion with respect to a lens function portion of a lens adjacent to the insertion portion.
The imaging blade drive device according to claim 1, wherein the contact surface is provided in a portion other than the lens functional portion of the lens adjacent to the insertion portion.
The imaging blade drive device according to claim 1, wherein the lens functional portion of the lens adjacent to the insertion portion is a convex lens.
The imaging blade drive device according to claim 1, wherein the range function portion of the lens adjacent to the insertion portion is a concave lens.
The lens frame includes a receiving surface perpendicular to the optical axis of the lens, and the receiving surface is a part of the frame of the blade driving device so that the insertion portion does not interfere with the adjacent lens in the gap. The imaging blade drive device according to any one of claims 1 to 4, wherein the imaging blade is supported.
The imaging blade drive device according to any one of claims 1 to 5, wherein the insertion portion is inserted at a lens design stop position of the lens.
The imaging blade driving device according to any one of claims 1 to 5, wherein the insertion portion is inserted at a position other than a diaphragm design in lens design of the plurality of lenses.
8. The imaging blade drive device according to claim 6, wherein the total opening diameter of the plurality of lenses is set by the opening formed in the insertion portion.
8. The imaging blade drive device according to claim 6, wherein the total aperture diameter of the plurality of lenses is set in addition to the aperture formed in the insertion portion.
The lens frame includes a front part that holds the lens in front of the slit, and a rear part that holds the lens on the rear side of the slit.
The imaging blade drive device according to any one of claims 1 to 9, characterized in that the mounting direction of the lens in the front part and the mounting direction of the lens in the rear part are opposite.
The lens frame includes a front part that holds the lens in front of the slit, and a rear part that holds the lens on the rear side of the slit.
The imaging blade drive device according to any one of claims 1 to 9, wherein a direction in which the lens is incorporated in the front stage and a direction in which the lens is incorporated in the rear stage are the same.
The imaging blade drive device according to any one of claims 1 to 11, wherein the insertion portion is a blade itself or a blade housing that stores the blade.
The imaging blade drive device according to claim 12, wherein the blade is a diaphragm blade for light amount adjustment, and is driven switchably or stepwise or steplessly.
The imaging blade drive device according to claim 12, wherein the blade is a shutter blade for light shielding.
The distance between the lenses in which the insertion portion is inserted is Lt, and the thickness in the optical axis direction of the blades in the insertion portion is t1 when the number of the blades is one, and t1, when the number of the blades is two. The following relationship is established, where t2, t3 and t2 when the number of the blades is three, and the space width in the optical axis direction of the blade chamber at the insertion portion is r. The imaging blade drive device according to any one of the items.
Note: When the number of the blades is one;
2 × r ≦ Lt, 3 × r> Lt, 2 × t1 ≦ Lt
When the number of blades is two;
2 × r ≒ Lt, 2 × (t1 + t2) ≒ r
When the number of blades is three;
2 × r> Lt, 2 × (t1 + t2 + t3) ≧ r
The imaging blade drive device according to any one of claims 1 to 11, wherein an optical filter is provided in the insertion portion.
The optical filter comprises a filter sandwiched between two protective blades,
17. The imaging relationship according to claim 16, wherein the following relationship is satisfied, where Lt is a distance between lenses into which the insertion portion is inserted, and r is a space width in the optical axis direction of the blade chamber in the insertion portion. Blade drive.
2 × r> Lt, 2 × (total thickness of filter and protective blade)> r
An imaging device comprising the imaging blade drive device according to any one of claims 1 to 17.
A portable electronic device comprising the imaging blade drive device according to any one of claims 1 to 17.