JP6451127B2 - Photography lens and imaging device - Google Patents

Description

The present invention relates to an imaging lens and an imaging apparatus having an alignment mechanism that adjusts the optical performance of an imaging lens including a plurality of lenses in a better direction.

In recent years, there has been a further demand for imaging devices that have higher performance, higher accuracy, and smaller size. For example, an image sensor that can obtain a higher resolution image has been adopted. For this reason, in order to meet the performance of such an image sensor, the demand for the optical performance of the taking lens is also increasing.

A photographic lens having high optical performance usually has a plurality of lens mirror chambers including a lens mirror chamber frame and one or more lenses. In such a photographic lens, sufficient optical performance cannot be obtained with a design in which the lens mirror chamber is simply fitted to the lens barrel. This is because a shift in the positional relationship between the plurality of lens mirror chambers adversely affects the resolution.

Accordingly, the manufacturing process of the taking lens is provided with a centering process in order to suppress the performance degradation caused by the manufacturing error. In such an alignment process, the lens barrel is attached to an alignment jig such as an MTF measuring instrument, and the position of the lens barrel held in the lens barrel is adjusted while observing the resolution performance. Then, after adjusting the position of the lens mirror chamber in the alignment step, an adhesive is applied to the engaging portion between the lens mirror chamber and the lens barrel in the state after the adjustment. Thereby, the lens mirror chamber is positioned and fixed with respect to the lens barrel in a state after adjustment.

For example, in the invention described in Patent Document 1, by rotating a plurality of adjustment members rotatably attached to the outer peripheral surface of the lens barrel body and displacing the lens holding member in the optical axis direction, the lens holding member holds the lens holding member. An alignment technique for adjusting the tilt of the lens is disclosed.

In the invention described in Patent Document 2, the first lens frame in which the first lens is fitted and held in advance in the first holding portion, and the second lens in which the second lens is fitted and held in advance in the second holding portion. By preparing a frame and using a predetermined alignment device, the second lens frame is fitted into the fitting recess of the first lens frame and finely adjusted two-dimensionally in a direction perpendicular to the optical axis. The second lens can be aligned with the lens, and then the third lens is fitted into the third holding portion of the second lens frame to finely adjust it in a direction perpendicular to the optical axis. Thus, there is disclosed a configuration in which two lenses can be aligned with respect to one lens by aligning the third lens with respect to the first lens and the second lens.

JP 2004-163865 A

JP 2014-10213 A

However, in the inventions described in Patent Documents 1 and 2, in order to hold the lens mirror chamber with high accuracy at the position after alignment, a process of directly fixing the lens mirror chamber to the lens barrel with an adhesive is performed. doing.

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When the lens mirror chamber is directly fixed to the lens barrel by an adhesive, the portion fixed by the adhesive is forcibly separated and disassembled when the lens is understood.

When removing a part fixed by an adhesive, a load is naturally applied to the corresponding part. For example, if the material of the lens mirror chamber is plastic, if you try to remove the lens mirror chamber fixed to the lens barrel, a load will be applied to the lens mirror chamber and the lens chamber frame of the lens mirror chamber will be deformed or damaged. There was a risk of it. In such a case, in the dismantling for repair, the parts once removed cannot be reused, and it becomes necessary to newly recreate the parts, which may increase the cost and working time.

Moreover, if the parts fixed by the adhesive are removed, the cured adhesive may be broken, and the fine fragments may remain in the lens barrel. If the purpose of dismantling is repair, the adhesive debris that has fallen into the lens barrel must be completely removed, so that the processing becomes extremely complicated.

The present invention has been made in view of the above-described circumstances, and does not cause parts to be deformed or damaged when the photographic lens is disassembled, or to cause scattering of hardened adhesive fragments. An object of the present invention is to provide an imaging lens and an imaging apparatus having an alignment mechanism.

Accordingly, in order to solve the above problem, the invention according to claim 1 is sandwiched between a lens mirror chamber for holding a lens, a base member for holding the lens mirror chamber, and the lens mirror chamber and the base member. in the imaging lens having an adhesive base pin, said base member has a holding portion for holding the adhesive base pin, the lens chamber has been said for fixing the adhesive base pin hole-like holding by the holding portion the adhesive portion possess, the adhesive base pin and a plate portion and a first protrusion, the first protrusion in the insertion and the state in which the plate-like portion closes all the adhesive portion to the bonding portion The photographic lens is characterized in that the bonding portion is fixed to the bonding base pin with an adhesive .

According to a second aspect of the present invention, in the lens mirror chamber according to the first aspect of the present invention, the lens mirror chamber has a dismantling perforation portion for pulling up the lens mirror chamber in the optical axis direction by placing a jig during disassembly. It was set as the imaging lens of description.

According to a third aspect of the present invention, there is provided a photographic lens having a lens mirror chamber for holding a lens, a base member for holding the lens mirror chamber, and an adhesive base pin sandwiched between the lens mirror chamber and the base member. The base member has a holding portion for holding the bonding stand pin, and the lens mirror chamber has a bonding portion for fixing a part of the bonding stand pin held by the holding portion of the base member ; A photographic lens having a dismantling perforation for pulling up the lens mirror chamber in the optical axis direction by placing a jig during disassembly .

According to a fourth aspect of the present invention, in the photographing lens according to any one of the second and third aspects, the dismantling perforated part is provided in the vicinity of the adhesive part of the lens mirror chamber. It was.

FIG. 3 is an exploded perspective view of the alignment mechanism of the photographing lens of the present invention. Enlarged view of the adhesive stand pin of the present invention Exploded sectional view of the alignment mechanism of the present invention The expanded sectional view of the adhesion stand pin part of the alignment mechanism of this invention Enlarged sectional view of the mirror room mounting screw portion of the alignment mechanism of the present invention

Embodiments of the taking lens according to the present invention will be described below with reference to FIGS. 1 is an exploded perspective view of the photographing lens of the present invention, FIG. 2 is an enlarged view of the adhesive stand pin of the present invention, FIG. 3 is an exploded sectional view of the alignment mechanism of the present invention, and FIG. 4 is an illustration of the alignment mechanism of the present invention. FIG. 5 is an enlarged cross-sectional view of a mirror chamber mounting screw portion of the alignment mechanism of the present invention.

Hereinafter, the alignment mechanism of the photographing lens of Example 1 will be described with reference to FIG. The alignment mechanism of the photographic lens of the present invention includes a lens mirror chamber 1 including a lens 3 and a lens mirror frame 2, an adhesive table pin A71, an adhesive table pin B72, an adhesive table pin C73, a fixing member 10, and a mirror chamber mounting screw A81. , A mirror chamber mounting screw B82, a mirror chamber mounting screw C83, a washer A91, a washer B92, and a washer C93. In the present invention, the head side of the mirror chamber mounting screw is referred to as the object side, and the foot side of the mirror chamber mounting screw is referred to as the image plane side.

As described above, the lens mirror chamber 1 constituting the alignment mechanism of the photographing lens according to the present embodiment is configured by the lens mirror chamber frame 2 caulking and holding the lens 3. The lens mirror chamber 1 constitutes a part of the photographing lens together with another lens mirror chamber (not shown). Further, the lens mirror chamber frame 2 has an adhesive base pin hole A41, an adhesive base pin hole B42, and an adhesive base pin hole C43. A part of the adhesive base pin A71, the adhesive base pin B72, and the adhesive base pin C73 is inserted into the adhesive base pin hole A41, the adhesive base pin hole B42, and the adhesive base pin hole C43, respectively. The adhesive base pin is inserted into the hole for the adhesive base pin, and after alignment, is fixed with an adhesive. That is, the adhesive base pin hole A41, the adhesive base pin hole B42, and the adhesive base pin hole C43 constitute the adhesive portion of the present invention. The lens mirror chamber frame 2 has a screw mounting hole A51, a screw mounting hole B52, and a screw mounting hole C53. A screw mounting hole A51, a screw mounting hole B52, and a screw mounting hole C53 are provided for a mirror chamber mounting screw A81, a mirror chamber mounting screw B82, and a mirror chamber mounting screw C83 that fix the lens mirror frame 2 to the fixing member 10, respectively. It is a hole. The lens mirror chamber frame 2 is fixed to the fixing member 10 with a washer A91, a washer B92, and a washer C93 for stabilizing the seating surface interposed between a mirror chamber mounting screw A81, a mirror chamber mounting screw B82, and a mirror chamber mounting screw C83. . The lens mirror chamber frame 2 has a disassembly jig hole A61, a disassembly jig hole B62, and a disassembly jig hole C63 for removing the lens mirror chamber frame 2 from the fixing member 10 during disassembly. The dismantling jig hole A61, the dismantling jig hole B62, and the dismantling jig hole C63 are dismantling perforations according to the present invention configured to be hooked with a bowl-shaped dismantling jig.

The fixing member 10 constituting the alignment mechanism of the photographing lens of the present embodiment is a lens barrel that holds the lens barrel frame 2. The fixing member 10 has a cylindrical shape, and holds the lens barrel frame 2 inside thereof. The lens mirror frame 2 is aligned by being adjusted and fixed in the fixing member 10 in a direction orthogonal to the optical axis. Therefore, the fixing member 10 is configured so that the lens mirror frame 2 has an inner diameter that allows the lens mirror frame 2 to be aligned and move sufficiently in a direction orthogonal to the optical axis. Further, the fixing member 10 has an adhesive base pin concave portion A111, an adhesive base pin concave portion B112, and an adhesive base pin concave portion C113. The adhesive base pin recess A111, the adhesive base pin recess B112, and the adhesive base pin recess C113 are recesses for press-fitting a part of the adhesive base pin A71, the adhesive base pin B72, and the adhesive base pin C73, respectively. It is a holding | maintenance part of this invention holding a pin. The fixing member has a screw mounting recess A121, a screw mounting recess B122, and a screw mounting recess C123. The screw mounting recess A121, the screw mounting recess B122, and the screw mounting recess C123 are used to fix the lens mirror frame 2 to the fixing member 10 by the mirror chamber mounting screw A81, the mirror chamber mounting screw B82, and the mirror chamber mounting screw C83, respectively. Is provided.

Next, the shape of the adhesive base pin A71, the adhesive base pin B72, and the adhesive base pin C73 will be described using the adhesive base pin A71 as an example with reference to FIG. The adhesive base pin A71 has a convex part in the direction parallel to the optical axis, one on each side from the center of the thin plate-like part. The first convex portion 711 that is the convex portion on the object side is inserted into the adhesive base pin hole A41, and the second convex portion 712 that is the convex portion on the image plane side is press-fitted into the concave portion A111 for the adhesive base pin. Such an adhesive stand pin is made of a metal such as brass. By making the adhesive stand pin out of metal, when the second convex portion on the image surface side is press-fitted into the concave portion for the adhesive stand pin, it is easy to press-fit, and the flatness of the thin plate-like portion is easily obtained. In addition, it is desirable that the adhesive base pin be made of metal in terms of stability and strength of the adhesive base pin during screw tightening.

Next, regarding the assembly of the alignment mechanism of the present embodiment, the part of the adhesive base pin hole C43, the adhesive base pin C73, the adhesive base pin recess C113, the mirror chamber mounting screw C83, and the screw mounting recess A121 are taken as examples. This will be described with reference to FIGS. 3, 4 and 5. As described above, FIG. 3 is an exploded cross-sectional view of the alignment mechanism of the present invention, FIG. 4 is an enlarged cross-sectional view of the adhesive base pin portion of the alignment mechanism of the present invention, and FIG. 5 is the alignment of the present invention. It is an expanded sectional view of a mirror room mounting screw portion of the mechanism.

As can be seen from FIG. 3, the adhesive stand pin C <b> 73 is interposed between the lens mirror frame 2 and the fixing member 10. Specifically, the second convex portion 732 of the adhesive base pin C73 is press-fitted into the concave portion C113 for the adhesive base pin of the fixing member 10, and the first convex portion of the adhesive base pin C73 is inserted into the hole C43 for the adhesive base pin of the lens barrel frame 2. 731 is inserted. At this time, as can be seen from FIG. 4, the pin concave portion C113 of the fixing member 10 and the second convex portion 732 of the adhesive base pin C73 are fixed by press-fitting, but the adhesive base pin hole C43 of the lens mirror chamber frame 2 The first convex portion 731 of the adhesive base pin C73 is merely inserted with a margin indicated by the hatched portion, and is not fixed in the optical axis direction or the direction orthogonal to the optical axis.

First, as described above, the adhesive base pin A71, the adhesive base pin B72, and the adhesive base pin C73 have the second convex portion as the adhesive base pin concave portion A111, the adhesive base pin concave portion B112, and the adhesive base pin for the fixing member 10, respectively. In the state where the first convex portion is inserted into the concave portion C113 and similarly inserted into the adhesive base pin hole A41, the adhesive base pin hole B42, and the adhesive base pin hole C43 of the lens mirror chamber frame 2, respectively. It is interposed between the frame 2 and the fixing member 10. Then, the lens mirror frame 2 is attached to the fixing member 10 with a mirror chamber mounting screw A81, a mirror chamber mounting screw B82, and a mirror chamber mounting screw C83. This is because the lens mirror frame 2 may be detached from the fixing member 10 due to impact or the like unless the mirror chamber mounting screw is attached.

However, if the lens mirror chamber frame 2 is completely fixed to the fixing member 10 and cannot move at all in the direction orthogonal to the optical axis, alignment cannot be performed. Therefore, as can be seen from FIG. 5 which is a cross-sectional view of the portion in which the mirror chamber mounting screw A81 is screwed, the shaft of the mirror chamber mounting screw A81 is screwed into the screw mounting recess A121 of the fixing member 10 without any gap. With respect to the screw mounting hole A51 of the mirror chamber frame 2, there is an interval indicated by a hatched portion between the axis of the mirror chamber mounting screw. Needless to say, the mirror chamber mounting screw B82 and the mirror chamber mounting screw C83 are screwed into the screw mounting recess B122 and the screw mounting recess C123 without any gaps in the same manner as the mirror chamber mounting screw A81. Regarding the mounting hole B52 and the screw mounting hole C53, there is a gap between the shaft of the mirror chamber mounting screw. The clearance allows the lens mirror frame 2 to be aligned in a direction orthogonal to the optical axis, but is firmly fixed so that the lens mirror frame 2 does not come off the fixing member 10 due to impact or the like. Can be realized. However, when the screw is completely tightened, the lens mirror frame 2 is strongly pressed against the fixing member 10 by the head of the mirror mounting screw and the washer, and the lens mirror frame 2 is adjusted in a direction perpendicular to the optical axis. I can't core. Therefore, alignment is performed without completely tightening the mirror chamber mounting screw, and after the alignment, the mirror chamber mounting screw is completely tightened.

Next, alignment work is performed on the lens mirror chamber frame 2 and the fixing member 10. In the alignment operation, a lens barrel is attached to an alignment jig such as an MTF measuring instrument, and the position in the direction perpendicular to the optical axis of the lens barrel frame 2 in the fixed member 10 is adjusted while observing the resolution performance. . As described above, the first convex portion 711 of the adhesive base pin A71 is inserted into the adhesive base pin hole A41 of the lens mirror chamber frame 2, and the second convex portion 712 of the adhesive base pin A71 is bonded to the fixing member 10. Although it is press-fitted into the base pin recess A111, the inner diameters of the adhesive base pin hole A41, the adhesive base pin hole B42 and the adhesive base pin hole C43 of the lens mirror frame 2 and the adhesive base pin A71 inserted therethrough 1 convex portion 711, the first convex portion (not shown) of the adhesive base pin B72, and the diameter of the first convex portion 731 of the adhesive base pin C73, the adhesive base pin hole A41, the adhesive base pin hole B42, the adhesive base pin Since the inner diameter of the hole C43 is larger, the lens mirror frame 2 can be adjusted on a plane orthogonal to the optical axis.

After alignment, fixing in the aligned state is performed. The lens mirror chamber 1 is fixed by pouring an adhesive into the adhesive base pin hole A41, the adhesive base pin hole B42, and the adhesive base pin hole C43 of the lens mirror chamber frame 2 through which the first convex portion of the adhesive base pin is inserted. By doing. As can be seen from FIG. 4, the hole for the adhesive stand pin has a mortar shape in which the opening on the object side is wider than the opening on the image plane side. The efficiency of the adhesive injection | pouring operation | work to the hole for adhesive stand pins becomes high because this hole for adhesive stand pins becomes mortar shape. This is because the mortar shape widens the opening for injecting the adhesive. Moreover, even if the injected adhesive is too much, it is difficult to overflow.

In addition, any adhesive can be poured into the hole for the adhesive stand pin. For example, if an ultraviolet curable adhesive is used, the adhesive can be fixed immediately after alignment without affecting the surrounding parts by heat. It can be carried out. When such an ultraviolet curable adhesive is used, the mortar shape of the hole for the adhesive pedestal pin also contributes to an improvement in ultraviolet irradiation efficiency for curing the adhesive. This is because the opening for ultraviolet irradiation becomes wide. In addition, even when disassembling, which will be described later, since the hole for the adhesive base pin has a mortar shape, it is easy to insert a jig for pushing the adhesive base pin and apply it to the adhesive base pin, and to easily extrude the adhesive base pin Thus, the structure has an advantage that the adhesive stand pin and the hardened adhesive are easily peeled from the lens mirror chamber frame 2.

Next, the dismantling work will be described. When disassembling, first, the mirror chamber mounting screw A81, the mirror chamber mounting screw B82, and the mirror chamber mounting screw C83 that fix the lens mirror frame 2 to the fixing member 10 are removed. When this mirror chamber mounting screw is removed, the lens mirror chamber frame 2 is only fixed to the fixing member 10 via the adhesive base pin A71, the adhesive base pin B72, and the adhesive base pin C73. Specifically, the second convex portion is press-fitted into the adhesive base pin concave portion A111, the adhesive base pin concave portion B112, and the adhesive base pin concave portion C113 of the fixing member 10, and the first convex portion is the adhesive base pin of the lens mirror chamber frame 2. The lens mirror frame 2 is fixed through the adhesive base pin A71, the adhesive base pin B72, and the adhesive base pin C73, which are inserted and fixed through the mounting hole A41, the adhesive base pin hole B42, and the adhesive base pin hole C43. It is fixed to the member 10.

In order to remove the lens mirror chamber frame 2 from the fixing member 10, a bowl-shaped disassembly jig is inserted into the disassembly jig hole A61, the disassembly jig hole B62, and the disassembly jig hole C63 from the object side in the optical axis direction. Insert it and pull it in parallel to the optical axis so as to catch the lens mirror frame 2. Thereby, the lens mirror chamber frame 2 is removed from the fixing member 10.

At this time, the first convex of each of the bonding table pin hole A41, the bonding table pin hole B42, the bonding table pin hole C43, the bonding table pin A71, the bonding table pin B72, and the bonding table pin C73 of the lens mirror frame 2 is provided. The parts are fixed with an adhesive, but on the other hand, the adhesive base pin concave portion A111, the adhesive base pin concave portion B112, the adhesive base pin concave portion C113 and the adhesive base pin A71, the adhesive base pin B72 of the fixing member 10 are bonded. Since the second convex portions of the base pin C73 are only fixed by press fitting, the second convex portions of the adhesive base pin A71, the adhesive base pin B72, and the adhesive base pin C73 are for the adhesive base pin of the fixing member 10. The adhesive base pin A71, the adhesive base pin B72, and the adhesive base pin C73 are attached to the lens mirror frame 2 away from the concave portion A111, the adhesive base pin concave portion B112, and the adhesive base pin concave portion C113.

The adhesion table pin A71, the adhesion table pin B72, and the adhesion table pin C73 are the adhesion table pin from the object side of the adhesion table pin hole A41, the adhesion table pin hole B42, and the adhesion table pin hole C43 of the lens mirror chamber frame 2. The first convex portion of each of A71, adhesive base pin B72, and adhesive base pin C73 is pushed out in the direction of the second convex portion, so that it can be easily removed from the lens mirror frame 2. As described above, the adhesive base pin hole has a mortar shape so that the first convex part of the adhesive base pin can be easily pushed out in the direction of the second convex part. In addition, since the adhesive base pin is made of metal, it is easier to remove than when it is made of plastic, and it is difficult to be damaged or damaged when it is removed from the adhesive base pin hole. Therefore, when disassembling, it is easy to reuse the subsequent bonding base pins.

Also, the disassembly jig hole A61, the disassembly jig hole B62, and the disassembly jig hole C63 are the adhesive base pin hole A41, the adhesive base pin hole B42, and the adhesive base pin hole C43 of the lens mirror frame 2. It is provided in the vicinity. By providing a disassembly jig hole A61, a disassembly jig hole B62, and a disassembly jig hole C63 in the vicinity of the adhesive base pin hole A41, the adhesive base pin hole B42, and the adhesive base pin hole C43 to be fixed. This is because the load on the lens mirror frame 2 can be suppressed during disassembly.

As described above, in the embodiment of the present invention, the lens mirror chamber frame 2 is fixed to the fixing member 10 on a plane orthogonal to the optical axis via the adhesive base pin. For this reason, the lens mirror frame 2 is fixed to the fixing member 10 directly because the lens mirror frame 2 is removed from the fixing member 10 by removing the adhesive base pin at the time of disassembly. Compared to the case, the possibility of parts being damaged or deformed can be kept low. Therefore, parts once removed can be reused, and as a result, increase in cost and process can be prevented.

Further, when the lens mirror chamber frame 2 is directly fixed to the fixing member 10, if the parts fixed by the adhesive are removed, the cured adhesive may be broken, and the fine fragments may remain in the lens barrel. However, in the embodiment of the present invention, the lens mirror chamber frame 2 is first removed from the fixing member 10 together with the adhesive base pin A71, the adhesive base pin B72, and the adhesive base pin C73 to which the adhesive is applied. Since the adhesive base pin A71, the adhesive base pin B72, and the adhesive base pin C73 to which the adhesive is attached are disassembled in the form of taking them out, they can be disassembled without leaving fine fragments of the adhesive in the lens barrel.

DESCRIPTION OF SYMBOLS 1 Lens mirror chamber 2 Lens mirror chamber frame 3 Lens 41, 42, 43 Bonding base pin hole 51, 52, 53 Screw mounting hole 61, 62, 63 Dismantling jig hole 71, 72, 73 Bonding base pin 81, 82 , 83 Mirror chamber mounting screws 91, 92, 93 Washers 10 Fixing members 111, 112, 113 Adhesive base pin recesses 121, 122, 123 Screw mounting recesses

Claims (4)

A lens mirror chamber for holding the lens;
A base member for holding the lens mirror chamber;
In a photographic lens having an adhesive stand pin sandwiched between the lens mirror chamber and the base member,
The base member has a holding portion for holding the adhesive stand pin,
The lens chamber have a hole-shaped adhesion portion for securing said adhesive base pins held in said holding unit,
The adhesive stand pin has a plate-like portion and a first convex portion,
The photographing lens, wherein the first convex portion is inserted into the adhesive portion and the plate-like portion covers the adhesive portion, and the adhesive portion is fixed to the adhesive base pin with an adhesive . The photographing lens according to claim 1, wherein the lens mirror chamber has a dismantling perforation portion for pulling up the lens mirror chamber in an optical axis direction by placing a jig during disassembly. A lens mirror chamber for holding the lens;
A base member for holding the lens mirror chamber;
In a photographic lens having an adhesive stand pin sandwiched between the lens mirror chamber and the base member,
The base member has a holding portion for holding the adhesive stand pin,
The lens mirror chamber has a bonding portion for fixing a part of the bonding stand pin held by the holding portion of the base member and a jig for lifting the lens mirror chamber in the optical axis direction during disassembly. A photographic lens having a perforating part for disassembly . The photographing lens according to claim 2, wherein the dismantling perforation is provided in the vicinity of the adhesion portion of the lens mirror chamber.

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