JPWO2019065539A1 - Blade drive device for imaging - Google Patents

Abstract

In the image pickup blade drive device in which the blade drive device is assembled to the lens frame, the lens performance can be maintained well and the optical performance of the blade drive device can be adjusted with high accuracy. The wing drive device for imaging includes a lens frame for holding a plurality of lenses and a wing drive device assembled to the lens frame, and the lens frame is provided with a slit corresponding to a gap between two adjacent lenses to drive the wing. The device includes a frame body in which a drive unit is housed and an insertion portion that protrudes from the frame body and is inserted into a gap between lenses by passing through a slit, and the lens frame or lens is a lens of a lens close to the insertion portion. It has a contact surface that protrudes toward the insertion part with respect to the functional part.

Description

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

A slit is provided on the side surface of the lens frame, an insertion portion (base plate) having an opening is projected from the drive portion of the blade drive device, and this insertion portion is inserted into the slit of the lens frame to integrate the lens frame and the blade drive device. An image pickup blade drive device to be assembled in is known (see Patent Document 1).

The conventional blade drive device for imaging is provided with a blade chamber for slidably holding the diaphragm blades in the insertion portion composed of a pair of main plates, and the insertion portion is inserted between a plurality of lenses held in the lens frame. As a result, the aperture of the insertion part is arranged on the optical axis of a plurality of lenses, and the aperture blade in the blade chamber is slid by the operation of the drive unit arranged outside the lens frame to control the aperture amount. ..

JP-A-2017-40814

In such an imaging blade drive device, the insertion portion is inserted through the gap between the lenses in the lens frame. Therefore, if the insertion portion comes into contact with the surface of the lens during insertion, the lens is damaged. There is a problem that the performance of the lens deteriorates due to sticking.

Further, since the insertion portion of the blade drive device is a thin member, if it interferes with the lens or the lens frame during insertion, the insertion portion or the blade housed inside the insertion portion is deformed, and the blades are formed. There arises a problem that the optical performance of the drive device cannot be maintained with high accuracy.

The present invention has been proposed to address such problems. That is, the present invention makes it possible to maintain good lens performance and to maintain high-precision optical performance of the blade driving device in the imaging blade driving device in which the blade driving device is assembled to the lens frame. , Etc. are the issues.

In order to solve such a problem, the present invention has the following configurations.

A lens frame for holding a plurality of lenses and a blade driving device assembled to the lens frame are provided, the lens frame is provided with a slit corresponding to a gap between two adjacent lenses, and the blade driving device is driven. A frame body in which a portion is housed and an insertion portion that protrudes from the frame body and is inserted into the gap by passing through the slit, and the lens frame or the lens is a lens function of a lens that is close to the insertion portion. An imaging blade driving device having a contact surface protruding toward the insertion portion with respect to the portion.

It is an external view ((a) is a perspective view, (b) is a plan view) of the vane drive apparatus for imaging which concerns on embodiment of this invention. It is sectional drawing of the vane drive apparatus for imaging which concerns on embodiment of this invention (AA sectional view in FIG. 1B, but the internal structure of the vane drive apparatus is omitted). (A) is an example of a convex lens for the lens L3, and (b) is an example of a concave lens for the lens L3. It is a cross-sectional view of the vane drive device for imaging which concerns on embodiment of this invention (the cross-sectional view of BB in FIG. It is explanatory drawing which shows the internal structure of the vane drive device. It is sectional drawing of the vane drive apparatus for imaging which concerns on another Embodiment of this invention (AA sectional view in FIG. 1B, but the internal structure of the vane drive apparatus is omitted). An explanatory view showing the function of the opening of the insertion portion ((a) is an example of a concave lens for the lens L3, and (b) is an example of a convex lens for the lens L3). An explanatory view showing the function of the opening of the insertion portion ((a) is an example of a concave lens for the lens L3, and (b) is an example of a convex lens for the lens L3). It is explanatory drawing which showed the dimensional relationship of the lens spacing and the insertion part of the blade drive device. It is explanatory drawing which showed the image pickup apparatus provided with the vane drive apparatus for imaging which concerns on embodiment of this invention (cross-sectional view, but the internal structure of the vane drive apparatus is omitted). It is explanatory drawing which showed the portable information terminal (portable electronic device) provided with the vane drive device for imaging 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 figures indicate parts having the same function, and duplicate description in each figure will be omitted as appropriate.

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

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

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

On the other hand, the blade driving device 3 includes a frame body 3A in which the driving unit is housed and an insertion portion 3B protruding from the frame body 3A. The insertion portion 3B is a member that is inserted into the gap between the lens L2 and the lens L3 by passing through the slit 2S of the lens frame 2, and may be the blade itself or the blade accommodating the blade. It may be a body. The frame body 3A of the blade driving device 3 is provided with a recess c for accommodating a part of the lens frame 2, and the insertion portion 3B projects into the recess c.

FIG. 4 shows an example of the internal structure of the blade driving device 3. In the illustrated example, the two blades 30 and 31 are housed inside the blade accommodating body 32. The blade accommodating body 32 accommodates the blades 30 and 31 in the thin blade chamber 32S, a part of which is housed in the frame body 3A, and the insertion portion 3B having the opening d protrudes from the frame body 3A.

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

The interlocking member 33 is a member that interlocks the operations of the two blades 30 and 31, and the engaging portion 33A on one end side is engaged with the engaged portion (engaging hole) 30P of the blade 30, and the other end side. 33B is engaged with the engaged portion (engagement hole) 31P of the blade 31. Further, the blades 30 and 31 are provided with elongated guide holes 30G and 31G extending in the protruding direction of the insertion portion 3B, respectively, and the guide holes 30G and 31G are engaged with the guide protrusion 35 of the frame body 3A. It fits.

The blades 30 and 31 in the blade drive device 3 shown in FIG. 4 are diaphragm blades, and the blades 30 and 31 are formed with diaphragm openings 30A and 31A, respectively, and the diaphragm openings 30A and 31A are inserted into the insertion portion 3B. It is arranged so as to overlap with the provided opening d. When the interlocking member 33 is rotated clockwise or counterclockwise around the shaft 34 by energizing the drive source, the blades 30 and 31 slide in opposite directions to the aperture openings 30A and 31A and the aperture d. The light transmission area (transmitted light amount) in which the two overlaps is continuously adjusted to be large or small. In the illustrated example, an example in which the blades 30 and 31 are driven steplessly is shown, but the blades may be driven stepwise as a form of the driving unit, or the blades may be driven in a switchable manner. It may be a thing.

Further, in the example of FIG. 4, the blades 30 and 31 are diaphragm blades, but the blades 30 and 31 may be shutter blades that transmit or block the light entering the opening d, or the light passing through the opening d. It may be an optical filter or the like that selectively adjusts the wavelength and intensity of the light.

The lens frame 2 is provided with a contact surface e projecting 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 on a portion of the lens L3 other than the lens functional portion Lf. The contact surface e projects further toward the insertion portion 3B from 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 on a portion of the lens L3 other than the lens functional portion Lf. In the illustrated example, the contact surface e is provided on the lenses L2 and L3, but the contact surface may be provided on the lens frame 2.

In such an imaging blade driving device 1, when the insertion portion 3B of the blade driving device 3 is inserted into the slit 2S of the lens frame 2, the insertion portion 3B is in sliding contact with the contact surface e described above and is in contact with the lens L2 and the lens. It is inserted in 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 come into contact with the lens functional portion Lf and is formed in the gap between the lenses L2 and L3. Will be inserted. As a result, it is possible to prevent a problem that the insertion portion 3B comes into contact with the lens functional portion Lf of the lenses L2 and L3 and the lens performance of the lenses L2 and L3 deteriorates.

Further, the contact surface e is formed so as to project inward of the interval of the slits 2S. Therefore, when the insertion 3B is inserted while sliding on the contact surface e, it is inserted between the pair of slits 2S in a state of being guided by the contact surface e without interfering with other parts. At this time, the insertion portion 3B can not only avoid contacting the lens functional portion Lf of the lenses L2 and L3, but also avoid contacting the edge portion of the slit 2S. As a result, it is possible to prevent problems such as deformation of the blades 30 and 31 housed inside the insertion portion 3B or the insertion portion 3B due to a collision of the insertion portion 3B, and maintain high performance of the optical performance of the blade drive device 3. can do.

The insertion portion 3B is not always inserted in contact with the contact surface e. If possible, the insertion portion 3B preferably passes through the gap between the lenses L2 and L3 without contacting the contact surface e. The above-mentioned receiving surface b included in the lens frame 2 is a part of the frame body 3A of the blade driving device 3 so that the insertion portion 3B does not interfere with the adjacent lenses L2, L3 and the like 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, by inserting the insertion portion 3B into the slit 2S with the frame body 3A supported by the receiving surface b, the insertion portion 3B becomes the optical axis. It moves across O so as to be orthogonal to each other 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 a front stage portion 2A and a rear stage portion 2B, and a light incident port f is provided at the front end of the front stage portion 2A, and the rear stage portion 2B is provided. A light emitting port g is provided at the rear end, 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 emission port g side). The mounting directions of the lenses L1 and L2 in the front stage portion 2A and the mounting directions of the lenses L3 to L5 in the rear stage portion 2B are the same. 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 hold the lenses L1 to L5. Therefore, on the inner surface of the lens frame 2, a step portion is formed in which the inner diameter gradually decreases from the rear end side (light emitting port g side) to the front end side (light incident port f side).

On the other hand, in the example shown in FIG. 5, the front stage portion 2A is incorporated in the order of the lenses L2 and L1, and the rear stage portion 2B is incorporated in the order of the lenses L3, L4 and L5. That is, the front stage portion 2A incorporates the lenses L2 and L1 from the front end side (light incident port f side), and the rear stage portion 2B incorporates the lenses L3 to L5 from the rear end side (light emission port g side). The mounting directions of the lenses L2 and L1 in the portion 2A and the mounting directions of the lenses L3 to L5 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 hold the lenses L1 to L5. Therefore, on the inner surface of the lens frame 2, the front end portion 2A is formed with a step portion whose inner diameter gradually decreases from the front end side to the inside, and the rear end portion 2B is on the rear end side (light emission port g side). ) Toward the inside, a step portion whose inner diameter gradually decreases is formed.

6 and 7 show the function of the opening d formed in the insertion portion 3B. In each figure, (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 diameters of the plurality of lenses L1 to L5 are set by the aperture d formed in the insertion portion 3B. That is, when the diaphragm blades are fully opened, of the light incident from the light incident port f of the lens frame 2, only the light that has passed through the aperture d is focused by the lenses L1 to L5 on an imaging surface (not shown).

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

Here, in the examples shown in FIGS. 6 and 7, in FIGS. 6A and 7A, the opening d of the insertion portion 3B is inserted at the aperture position of the lenses L1 to L5 in the lens design. .. 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 aperture position of the lenses L1 to L5 in the lens design. As described above, the insertion portion 3B may be inserted so as to match the aperture position of the lens system held in the lens frame 2 in the lens design, or may be inserted at any other position. When the insertion portion 3B is inserted at a position other than the aperture position in the lens design, the captured image is in a state of partially cutting the outer peripheral light rays, so that image correction is appropriately performed as necessary.

As described above, the imaging blade driving device 1 according to the embodiment of the present invention deteriorates the performance of the lens when the insertion portion 3B of the blade driving device 3 is inserted into the gap between the lenses of the lens frame 2. In addition, the optical performance of the blade can be maintained with high accuracy. As a result, it is possible to obtain an imaging blade driving device 1 that maintains high optical performance.

FIG. 8 shows the relationship between the thickness of the internal component of the insertion portion 3B of the blade driving device 3 in the optical axis direction and the lens spacing into which the insertion portion 3B is inserted. In the imaging blade driving device 1 in which the insertion portion 3B of the blade driving device 3 is inserted between the lenses of the two lenses L2 and L3, it is desirable to make the lens spacing as narrow as possible in terms of the optical design of the lens group. Since the insertion portion 3B is inserted, the thickness of the internal component of the insertion portion 3B in the optical axis direction and the lens spacing must have an appropriate dimensional relationship.

Here, as shown in FIG. 8, the lens spacing between the front lens L2 and the rear lens L3 into which the insertion portion 3B is inserted is Lt, and the thickness of each of the blades 30 (31) in the optical axis direction is set. As shown in the figure, when the number of blades 30 and 31 is two, t1, t2 is used, when the number of blades is three, t1, t2, t3, respectively, and when the space width in the optical axis direction of the blade chamber 32S is r. , It is preferable to design the dimensions 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 is t1, t2, t3);
2 × r> Lt, 2 × (t1 + t2 + t3) ≧ r

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

When the blade chamber 32S is formed by arranging an intermediate between a pair of plate-shaped bodies, the thickness m in the optical axis direction of the intermediate becomes the space width r in the optical axis direction of the blade chamber 32S. Therefore, the above relationship can be rewritten as follows.

When the number of blades is one (thickness t1);
2 × m ≦ Lt, 3 × m> Lt, 2 × t 1 ≦ 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 is t1, t2, t3);
2 × m> Lt, 2 × (t1 + t2 + t3) ≧ m

Further, when an optical filter is arranged instead of the blades and the optical filter is a filter sandwiched between two protective blades, it is preferable to do as follows.
2 × m> Lt, 2 × (total thickness of filter and protective blade)> m

With the above relationship, the relationship between the thickness t1, t2, t3 in the optical axis direction of the blade, the space width r (m) in the optical axis direction of the blade chamber 32S, and the lens spacing Lt into which the insertion portion 3B is inserted is set. By doing so, 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 image pickup device 100 as an optical unit including the image pickup blade drive device 1. The blade drive device 3 can be assembled in the lens frame 2 as described above and mounted in the housing 100A on which the image pickup device 101 is mounted to form the image pickup storage 100. Further, various optical units can be obtained by assembling the blade driving device 3 to other optical components. Such an imaging device 100 or an optical unit can be made thinner, and the installation space along the optical axis direction can be saved. Further, since the blade driving device 3 can be assembled and integrated after adjusting the lens frame 2 and the like, simple and highly accurate adjustment is possible, and a simple mounting in which the blade driving device 3 is integrated. Becomes possible.

FIG. 10 shows a portable electronic device (portable information terminal) 200 including the above-mentioned imaging device 100. The thickness of the unit mounted inside the portable electronic device 200 such as a smart phone is severely limited, but the image pickup device 100 described above is assembled by housing the blade driving device 3 within the thickness of the lens frame 2. Since it is possible to reduce the thickness, it can be space-efficiently mounted on a portable electronic device 200 pursuing 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 the design changes, etc. within the range not deviating from the gist of the present invention, etc. Even if there is, it is included in the present invention. In particular, in the above-described embodiment, the frame body 3A of the blade drive device 3 and the blade accommodating body 32 having the insertion portion 3B are made of separate members, but the blade accommodating body having the insertion portion 3B integrally with the frame body 3A. The body 32 can be configured, and the drive frame chamber in the frame body 3A and the blade chamber of the blade accommodating body 30 can be separated by a partition.

1: Blade drive device for imaging,
2: Lens frame, 2A: Front stage, 2B: Rear stage, 2C: Connecting part,
2S: Slit,
3: Blade drive device, 3A: Frame body, 3B: Insert part,
30, 31: Blade, 30A, 31A: Aperture opening,
30P, 31P: Engagement part (engagement hole), 30G, 31G: Guide hole,
32: Blade housing, 32S: Blade chamber,
33: Interlocking member, 33A, 33B: Engaging part (engaging protrusion), 34: Shaft,
35: Guide protrusion,
L1 to L5: lens, Lf: lens function part, a: step part, b: receiving surface,
c: recess, d: opening, e: contact surface, f: light incident port, g: light emitting port,
D1, D2: outer diameter, O: optical axis

Claims (19)

A lens frame for holding a plurality of lenses and a blade drive device attached to the lens frame are provided.
The lens frame comprises a slit corresponding to the gap between two adjacent lenses.
The blade driving device includes a frame body in which a driving unit is housed, and an insertion portion that protrudes from the frame body and is inserted into the gap by passing through the slit.
An imaging blade driving device, wherein the lens frame or the lens has a contact surface that projects toward the insertion portion with respect to a lens function portion of the lens that is close to the insertion portion. The vane driving device for imaging according to claim 1, wherein the contact surface is provided in a portion other than the lens functional portion of the lens close to the insertion portion. The vane driving device for imaging according to claim 1 or 2, wherein the lens functional portion of the lens close to the insertion portion is a convex lens. The vane drive device for imaging according to claim 1 or 2, wherein the range function portion of the lens close 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 forms a part of the frame body of the blade driving device so that the insertion portion does not interfere with a lens in the vicinity in the gap. The imaging blade driving device according to any one of claims 1 to 4, wherein the lens is supported. The imaging blade driving device according to any one of claims 1 to 5, wherein the insertion portion is inserted at a diaphragm position in the lens design 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 the diaphragm position in the lens design of the plurality of lenses. The vane driving device for imaging according to claim 6 or 7, wherein the total aperture diameters of the plurality of lenses are set by the aperture formed in the insertion portion. The vane driving device for imaging according to claim 6 or 7, wherein the total aperture diameters of the plurality of lenses are set in addition to the openings formed in the insertion portion. The lens frame includes a front stage portion that holds the lens on the front side of the slit and a rear stage portion that holds the lens on the rear side of the slit.
The vane driving device for imaging according to any one of claims 1 to 9, wherein the mounting direction of the lens in the front stage portion and the mounting direction of the lens in the rear stage portion are opposite to each other. The lens frame includes a front stage portion that holds the lens on the front side of the slit and a rear stage portion that holds the lens on the rear side of the slit.
The vane driving device for imaging according to any one of claims 1 to 9, wherein the mounting direction of the lens in the front stage portion and the mounting direction of the lens in the rear stage portion are the same. The imaging blade driving device according to any one of claims 1 to 11, wherein the insertion portion is a blade itself or a blade accommodating body that accommodates the blade. The imaging blade driving device according to claim 12, wherein the blade is a diaphragm blade for adjusting the amount of light, and is driven in a switchable manner, stepwise or steplessly. The imaging blade driving device according to claim 12, wherein the blade is a shutter blade for shading. The distance between the lenses into which the insertion portion is inserted is Lt, and the thickness of each blade in the insertion portion in the optical axis direction is t1 when the blade is one, and t1 when the blade is two. T2, when the number of the blades is three, t1, t2, t3, and the space width in the optical axis direction of the blade chamber at the insertion portion is r, and the following relationship is established. The vane driving device for imaging according to any one of the items.
Note: When the number of 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 driving device according to any one of claims 1 to 11, wherein an optical filter is provided in the insertion portion. The optical filter includes a filter sandwiched between two protective blades.
The imaging device according to claim 16, wherein the distance between the lenses into which the insertion portion is inserted is Lt, and the space width in the optical axis direction of the vane chamber in the insertion portion is r, and the following relationship is established. Blade drive device.
Note 2 × r> Lt, 2 × (total thickness of filter and protective blade)> r An imaging device including the imaging blade driving device according to any one of claims 1 to 17. A portable electronic device comprising the imaging blade driving device according to any one of claims 1 to 17.

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