JP5875574B2 - Lens optical device - Google Patents

Description

  The present invention relates to a lens optical device having a structure in which another lens is aligned and assembled to a base such as a lens barrel or a base plate to which optical elements such as a shutter unit and a diaphragm unit including a lens are attached.

  As a conventional lens optical device, a fixed cylinder as a base, a diaphragm unit including a lens attached to the fixed cylinder, a plurality of lenses arranged at a predetermined interval in the optical axis direction with the diaphragm unit (and the lens), A lens tube for fixing a plurality of lenses is provided, and the plurality of lenses are fitted and fixed in advance to the lens tube while adjusting each other (adjusting the distance in the optical axis direction and the inclination with respect to the optical axis). The fixed lens barrel is fastened to the base with screws or the like, and the lens of the aperture unit is aligned (adjustment of the distance in the optical axis direction and the inclination with respect to the optical axis) (or after alignment) A lens barrel (which can be fixed with an adhesive or the like) is known (see, for example, Patent Document 1).

  However, in this lens optical device, the lens fixed to the aperture unit is aligned (aligned) with respect to the base (the position serving as the reference), and the lens incorporated in the lens tube is referred to as the lens cylinder (the reference). It is necessary to align (align) the lens tube with the lens fixed to the base incorporating the aperture unit while aligning (aligning) with the lens tube. Alignment work is complicated, and when it is fixed with adhesive after alignment, it is not easy to disassemble afterwards, and there is a defective part (for example, alignment was not performed sufficiently or position It is difficult to replace only the component including the lens that has caused the shift and reuse other components (for example, a diaphragm unit including the lens).

JP-A-11-64704

  The present invention has been made in view of the circumstances of the prior art described above, and the object of the present invention is to perform alignment work while simplifying the structure, reducing the number of parts, facilitating alignment work, and the like. It is an object to provide a lens optical device that can easily disassemble a problem part and reuse other trouble-free parts even when it is fixed with an adhesive or the like after performing .

A lens optical device according to the present invention includes a base, an optical element fixed to the base, a lens assembled to the base while being aligned with the optical element, and a lens frame that holds the lens. The base includes a receiving portion that receives the lens by directly contacting the lens in the optical axis direction, and the lens frame is detachably and annularly formed with respect to the base, and has a predetermined shape with respect to the outer peripheral surface of the lens. And an adhesive reservoir for storing an adhesive for adhering at least a part of the outer peripheral surface of the lens.
According to this configuration, the lens is adjusted with respect to a base on which optical elements (for example, an aperture unit including a lens, a shutter unit, an image sensor, and other optical units that require alignment of the incorporated lens) are fixed in advance. When assembling while centering, the lens frame is first assembled to the base, the lens is inserted inside the lens frame and brought into contact with the receiving part of the base and positioned in the optical axis direction, and the adhesive is placed in the adhesive reservoir. Fill the lens and finely adjust the lens in the lens frame in the direction perpendicular to the optical axis (along the receiving part) to adjust the deviation of the optical axis, and then cure the adhesive (cured by ultraviolet irradiation etc.) Thus, the lens assembly and alignment work can be completed.
In this way, since the lens is directly brought into contact with the base (receiving portion) in which the optical element is incorporated for positioning in the optical axis direction, the lens barrel for fixing the lens is assembled to the base as in the conventional case. Thus, it is possible to easily assemble the lens while aligning the lens while achieving the simplification of the structure and the reduction in the number of parts. In addition, since the lens is fixed only to the lens frame, and the lens frame is detachable from the base, if the alignment work of the incorporated lens is insufficient, the lens The optical element incorporated in the base can be reused together with the base simply by removing the lens frame to which the is fixed.

In the above configuration, the lens frame has an annular end facing the base, and a through hole through which a screw for fastening is passed. The base has an annular receiving portion, and the lens frame has an annular shape around the receiving portion. A configuration having an annular groove for receiving the end portion and a screw hole for fastening a screw through the through hole of the lens frame can be adopted.
According to this configuration, since the annular groove is provided around the receiving portion of the base, when the lens frame is assembled to the base, the annular end portion of the lens frame is easily fitted into the annular groove. Even if the adhesive flows into the interior from the gap between the inner peripheral wall of the lens frame and the outer peripheral surface of the lens, the flowed adhesive is received by the annular groove. Intrusion into the inside from the opening inside the receiving portion can be prevented. Further, the lens frame can be easily attached and detached by attaching it to the base with screws.

In the above configuration, the lens frame may have a positioning projection that is positioned with respect to the base, and the base may have a positioning recess in which the positioning projection is fitted.
According to this configuration, when the lens frame is assembled to the base, the lens frame can be assembled at a desired position on the base with high accuracy by fitting the positioning protrusion of the lens frame into the positioning recess of the base. A gap (a gap between the inner peripheral wall of the lens frame and the outer peripheral surface of the lens) for fine adjustment in the direction perpendicular to the optical axis can be ensured uniformly without any deviation.

  According to the lens optical device having the above configuration, the structure is simplified, the number of parts is reduced, the alignment work is facilitated, etc. However, it is possible to obtain a lens optical device that can easily disassemble a part that has caused a problem such as a positional deviation and reuse a part without any other problem.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view illustrating a state of a lens optical device according to an embodiment of the present invention and a state before a lens is assembled after a lens frame is assembled. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates a lens optical device according to an embodiment of the present invention, and is a front view illustrating a state in which a lens and a lens frame are incorporated in a base. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates an embodiment of a lens optical device according to the present invention, and is a cross-sectional view illustrating a state in which a lens and a lens frame are incorporated into a base. 1 is an exploded perspective view showing a lens, a lens frame, and a base according to an embodiment of a lens optical device according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates an embodiment of a lens optical device according to the present invention, and is an exploded cross-sectional view illustrating a lens, a lens frame, and a base. 1 is a cross-sectional view illustrating a relationship between a lens frame and a lens, illustrating an embodiment of a lens optical device according to the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIGS. 1 to 3, the lens optical device according to this embodiment includes a base 10, a diaphragm unit E1 as various optical elements assembled to the base 10, a lens unit E2 including a lens G, and image blur correction. A unit E3, a lens 20 assembled to the base 10, and a lens frame 30 for holding and fixing the lens 20 are provided.
As shown in FIGS. 3 to 5, the base 10 has a circular opening 11 formed substantially at the center, an annular flat surface 12 as a receiving part formed around the opening 11 on one surface, and an annular shape. An annular groove 13 formed around the flat surface 12, a screw hole 14 and a positioning recess 15 formed around the annular groove 13, a mounting portion 16 to which other parts are attached, and the diaphragm unit E <b> 1 on the other surface. And a fixing portion 18 for fixing the lens unit E2 including the lens G.

As shown in FIG. 5, the annular flat surface 12 is formed on the plane S so as to receive the annular end surface 21 of the lens 20 in contact therewith.
As shown in FIG. 5, the annular groove 13 is configured to receive the annular end portion 33 of the lens frame 30, and the outer peripheral wall is formed as a vertical wall, and the inner peripheral wall is inclined downward toward the groove bottom. It is formed to do.
As shown in FIGS. 1, 2, and 4, the screw holes 14 are provided at two of the circumferentially divided portions in order to screw the screws B passed through the through holes 34 of the lens frame 30. Is formed.
As shown in FIG. 4, the positioning recess 15 is formed as a cylindrical hole at one of the portions that are substantially divided in the circumferential direction so as to fit the positioning projection 35 of the lens frame 30.
The attachment portion 16 is formed so that the coil and the yoke CY included in the image blur correction unit E3 or the electromagnetic actuator M that drives the aperture blade included in the aperture unit E1 can be attached.

As shown in FIG. 3, the accommodating part 17 is formed so that the aperture blade (not shown) of the aperture unit E1 is rotatably accommodated.
As shown in FIG. 3, the fixing portion 18 is formed so that the lens unit E2 to which the lens G having the optical axis L1 is fixed can be fixed or fastened.
Here, when the fixing unit 18 fixes the lens unit E2, the optical axis L1 of the lens G is perpendicular to the plane S on which the annular flat surface 12 is located, and the optical axis L1 of the lens G is The lens unit E2 is positioned substantially at the center, and is formed so that the lens unit E2 can be fixed with fine adjustment so that the distance in the optical axis L1 direction between the lens G and the annular flat surface 12 becomes a predetermined value.

The diaphragm unit E1 includes diaphragm blades (not shown), a driving motor M, and the like. The diaphragm blades and the like are accommodated in the accommodating portion 17 of the base 10, and the motor M is fixed to the front side of the base 10. .
As shown in FIG. 3, the lens unit E <b> 2 includes a lens G and a lens holding member E <b> 21 that fixes the lens G and is fixed to the fixing portion 18 of the base 10.
As shown in FIG. 3, the lens G is a biconvex lens having an optical axis L1.
The lens holding member E21 further fixes the lens G in advance, and further the base 10 so that the optical axis L1 of the lens G is perpendicular to the plane S of the base 10 and the optical axis L1 is positioned substantially at the center of the opening 11. After being aligned so that the distance in the optical axis L1 direction to the annular flat surface 12 becomes a desired value, it is fixed to the fixing portion 18 of the base 10.
The image blur correction unit E3 is configured by a movable holder (not shown) that is movably supported with respect to the base 10 and holds a correction lens, a drive mechanism that includes a coil, a yoke CY, and the like to drive the movable holder. Yes.

As shown in FIGS. 5 and 6, the lens 20 is a cemented lens in which a small-diameter biconvex lens 20 a and a large-diameter biconcave lens 20 b are cemented, and an annular end surface 21 that comes into contact with the annular flat surface 12 of the base 10. The outer peripheral surface 22, the convex surface 23, the concave surface 24, etc. which demarcate the edge arrange | positioned so that the inner peripheral wall 31 of the lens frame 30 may be opposed are provided.
In the lens 20, the biconvex lens 20a and the biconcave lens 20b are pre-aligned and bonded and fixed, and have an optical axis L2 as a whole, and the outer peripheral surface 22 is formed to have an outer diameter φd. ing.

  As shown in FIGS. 1 to 6, the lens frame 30 is formed in a substantially annular shape, and has an inner peripheral wall 31 formed so as to form a predetermined gap with the outer peripheral surface 22 of the lens 20, and the outer peripheral surface 22 of the lens 20. Three adhesive reservoir portions 32 for accumulating an adhesive Gr for adhering at least a part (here, three locations) of the base plate, an annular end portion 33 fitted in the annular groove 13 of the base 10, and two penetrations through which a fastening screw B is passed. A hole 34, a positioning projection 35 to be fitted into the positioning recess 15 of the base 10, and the like are provided.

The inner peripheral wall 31 is formed as a cylindrical surface having an inner diameter φD, and is formed so as to receive the outer peripheral surface 22 of the lens 20 with a predetermined gap.
The adhesive reservoir 32 is formed as a recess by partially thinning the inner peripheral wall 31 in an arc shape on the upper end side of the lens frame 30 (the end side located in the upper part in FIG. 5).
The annular end portion 33 is formed in a cylindrical shape with a diameter smaller than the outer diameter of the lens frame 30, and is fitted into the annular groove 13 of the base 10.
The through hole 34 is formed so that the threaded portion of the screw B passes through with a predetermined gap and the head of the screw B does not pass.
The positioning protrusion 35 is formed in a stepped columnar shape and is formed so as to be fitted into the positioning recess 15 of the base 10.

Here, regarding the relationship between the lens 20 and the lens frame 30, as shown in FIG. 6, the outer diameter φd of the outer peripheral surface 22 of the lens 20 is smaller than the inner diameter φD of the inner peripheral wall 31 of the lens frame 30. A gap ΔC is formed in the gap.
After the lens frame 30 is fastened and fixed to the base 10, the gap ΔC is inserted into the lens frame 30 and brought into contact with the annular flat surface 12 of the base 10, and then the annular flat surface 12 (plane S). When the alignment operation is performed so that the optical axis L2 of the lens 20 coincides with the optical axis L1 of the lens G while being moved along, the minimum dimension necessary for the alignment operation to the adhesive reservoir 32 is set. The filled adhesive is formed so as to fall within a range of a dimension (maximum dimension) that does not flow into the gap ΔC and enter the inside.
Since the fluidity varies depending on the viscosity (viscosity) of the adhesive Gr, the maximum dimension of the gap ΔC is defined according to the adhesive Gr used.

  In addition, as shown in FIG. 6, the relationship between the height dimension (edge thickness) h of the outer peripheral surface 22 of the lens 20 and the height dimension H of the inner peripheral wall 31 of the lens frame 30 satisfies the relationship of H> h. The relationship between the height dimension H1 of the inner peripheral wall 31 in the region where the adhesive reservoir 32 is formed and the depth dimension H2 of the adhesive reservoir 32 is such that H1> H2. It is preferable to be formed so as to satisfy. By satisfying such a dimensional relationship, a part of the outer peripheral surface 22 of the lens 20 is securely fixed to the lens frame 30 using the adhesive Gr while preventing the adhesive Gr from flowing into the base 10. be able to.

Next, assembly and alignment work of the lens optical device having the above configuration will be described.
First, as shown in the lower region of FIG. 3, the aperture unit E1, the lens unit E2 including the lens G, the image blur correction unit E3, and the like are incorporated into the base 10.
Here, the lens G is arranged so that the optical axis L1 is perpendicular to the plane S (annular flat surface 12) of the base 10 and the optical axis L1 is positioned at the approximate center of the opening 11. They are aligned and assembled so that the distance in the optical axis L1 direction to the annular flat surface 12 becomes a desired value.

Subsequently, the lens frame 30 is brought close to the base 10, the annular end 33 is fitted into the annular groove 13, the positioning projection 35 is fitted into the positioning recess 15, and the screw B is passed through the through hole 34. The lens frame 30 is fastened and fixed to the base 10 by being screwed into the screw holes 14.
When the lens frame 30 is attached, the annular end 33 of the lens frame 30 is fitted into the annular groove 13 and the positioning projection 35 is fitted into the positioning recess 15 to bring the lens frame 30 into a desired position on the base 10. It can be incorporated with high accuracy, and a gap (gap between the inner peripheral wall 31 of the lens frame 30 and the outer peripheral surface 22 of the lens 20) for finely adjusting the lens 20 in the direction perpendicular to the optical axis L2 is biased. Can be ensured uniformly.

Subsequently, the lens 20 is inserted into the lens frame 30 close to the base 10 from above, and the annular end surface 21 of the lens 20 is brought into contact with the annular flat surface 12 as a receiving portion of the base 10.
Thereby, with the base 10 as a reference, the inter-axis distance between the lens G and the lens 20 in the optical axis L1 and L2 directions is set to a predetermined value.
Subsequently, an ultraviolet curable adhesive Gr is injected into the adhesive reservoir 32. Here, since the annular groove 13 is formed around the annular flat surface 12, the adhesive Gr before being cured is temporarily introduced from the gap between the inner peripheral wall 31 of the lens frame 30 and the outer peripheral surface 22 of the lens 20. Even when the adhesive Gr flows into the annular flat surface 12, the adhesive Gr that has flowed in is received by the annular groove 13 and can be prevented from entering the inside from the opening 11 inside the annular flat surface 12.

Then, while confirming a predetermined alignment measuring instrument or image, the optical axis L2 of the lens 20 is made to coincide with the optical axis L1 of the lens G while moving the lens 20 along the annular flat surface 12. While maintaining the state, the adhesive Gr is irradiated with ultraviolet rays to cure the adhesive Gr.
Thereby, the lens 20 assembly to the base 10 and the alignment operation to the lens G are completed.

  On the other hand, if the alignment operation of the lens 20 is insufficient, the base 10 assembled with the other optical elements E1, E2, E3 can be obtained by loosening the screw B and removing the lens frame 30 to which the lens 20 is fixed. Can be reused.

  According to the lens optical device having the above-described configuration, the lens 20 is brought into direct contact with the base 10 (the annular flat surface 12 as a receiving portion thereof) in which the optical elements E1, E2, and E3 are incorporated, and the optical axes L1 and L2 directions. Compared to the conventional case where a lens barrel that fixes the lens is assembled to the base, the lens can be easily positioned while achieving a simplified structure, a reduced number of parts, and easier alignment. 20 can be assembled while aligning. On the other hand, when the alignment operation of the lens 20 is insufficient, it is incorporated into the base 10 simply by removing the lens frame 30 to which the lens 20 is fixed. The optical elements E1, E2, E3 can be reused together with the base 10.

In the above embodiment, the annular flat surface 12 is used as the receiving portion provided on the base 10, but the present invention is not limited to this, and a plurality of supporting convex portions scattered in the circumferential direction may be provided. Even if it is not a flat surface, it may be formed as an annular convex surface whose section is curved in a convex shape.
In the above-described embodiment, the lens 20 in which the two lenses 20a and 20b are joined is shown as the lens fixed to the lens frame 30, but the present invention is not limited to this, and a single lens, three or more lenses are used. A cemented lens and other lenses can be applied.

In the above-described embodiment, the aperture unit E1, the lens unit E2, and the image blur correction unit E3 are shown as optical elements pre-assembled in the base 10. However, the present invention is not limited to this, and a shutter unit including a lens, The present invention can be employed in a configuration including an image sensor and other optical elements.
In the above-described embodiment, the method of fastening using the screw B is shown as a method of making the lens frame 30 detachable from the base 10, but the method is not limited to this, and the lens frame 30 is fixed by snap fit or the like. A configuration may be employed in which a screwing groove is provided in the base, a screwing screw is provided in a part of the lens frame, and the lens frame is detachably screwed to the base.

  As described above, the lens optical device according to the present invention achieves the simplification of the structure, the reduction in the number of parts, the ease of alignment work, etc., and is fixed with an adhesive after performing the alignment work. Even so, it is possible to easily disassemble components that have caused problems such as misalignment and reuse other components that are free from other problems, and thus can be applied to lens optical devices including an aperture unit and a shutter unit. Needless to say, the present invention is also useful in optical equipment including other lenses.

10 base 11 opening 12 annular flat surface (receiving part)
S plane 13 annular groove 14 screw hole E1 aperture unit E2 lens unit G lens L1 optical axis 15 of lens G positioning recess 20 lens 21 annular end surface 22 outer peripheral surface L2 optical axis 30 of lens 20 lens frame B screw 31 inner peripheral wall 32 adhesive Reservoir 33 Annular end 34 Through hole 35 Positioning protrusion Gr Adhesive

Claims (3)

A base, and an optical element fixed to the base, a lens assembled before Symbol base, a lens optical device and a lens frame for holding the lens,
The base has a receiving portion that receives the lens in direct contact with the optical axis direction;
The lens frame is detachably attached to the base and is formed in an annular or substantially annular shape , an inner peripheral wall formed with a predetermined gap from the outer peripheral surface of the lens, and at least a part of the outer peripheral surface of the lens Having an adhesive reservoir for storing the adhesive to be bonded,
A lens optical device. The lens frame has an annular end facing the base and a through-hole through which a screw for fastening passes.
The base has an annularly formed receiving portion, an annular groove for receiving an annular end portion of the lens frame around the receiving portion, and a screw hole for fastening a screw through the through hole of the lens frame. ,
The lens optical apparatus according to claim 1. The lens frame has positioning protrusions that are positioned with respect to the base;
The base has a positioning recess into which the positioning protrusion is fitted.
The lens optical device according to claim 1, wherein the lens optical device is a lens optical device.

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