JP2017146486A - Lens device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens device that continues urging force urging a lens frame against a reference surface of a holding frame holding the lens frame, and makes a simple structure tightly fix the lens frame and the holding frame.SOLUTION: A lens device comprises: a lens L1; a lens frame 12; a holding frame 13 that abuts on the lens frame 12 in a reference surface 13A vertical to an optical axis to hold the lens frame 12; and an adhesive part C that tightly fixes the lens frame 12 to the holding frame 13. The lens frame 12 has: a an abutting surface 12B abutting on a reference surface 13A; and an outer peripheral surface 12A that has a diameter getting larger as it goes downward when a direction toward the reference surface 13A from the abutting surface 12B is regarded as downward. At least a part of the adhesive part C is piled on an upward surface 13C and is provided between the upward surface 13C and an outer peripheral surface of the lens frame 12 located above the upward surface 13C.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a lens apparatus, and more particularly to a structure for adjusting and bonding a lens frame.

  2. Description of the Related Art Conventionally, in lens devices used in various cameras, the lens frame holding the lens is moved in a direction perpendicular to the optical axis with respect to the lens device main body, and then the lens frame is bonded to the lens device main body. It is fixed (Patent Document 1).

  Here, in Patent Documents 2 and 3, the lens frame is provided with a taper surface around the optical axis, and a plurality of support portions protruding toward the taper surface are moved back and forth with respect to the taper surface. A technique is disclosed in which the position of the lens frame is adjusted by moving the lens frame along a surface perpendicular to the optical axis while pressing against the surface perpendicular to the optical axis.

JP 2004-157286 A JP 2007-310067 A JP 05-45550 A

  Here, as a result of diligent studies by the inventors of the present application, in a lens device as shown in Patent Documents 2 and 3, a holding frame that holds the lens frame and the lens frame in a state where the lens frame is pressed against a surface perpendicular to the optical axis. It is desirable to continue the urging force that presses the lens frame against the surface perpendicular to the optical axis after the urging force by the member protruding toward the tapered surface is removed. It was revealed.

  The present invention has been made in view of such circumstances. That is, in the lens device, the holding frame that holds the lens frame abuts the lens frame with a reference plane perpendicular to the optical axis to hold the lens frame, and the lens frame has an outer peripheral inclined surface (tapered surface) around the optical axis. When the lens frame receives an external force on the outer peripheral inclined surface and the lens frame is aligned and fixed along the surface perpendicular to the optical axis, the lens frame is pressed against the reference surface with a simple structure. An object of the present invention is to provide a lens device capable of continuing the urging force.

  The lens device according to the present invention includes a lens, a lens frame that holds the outer periphery of the lens, a holding frame that holds the lens frame in contact with the lens frame on a reference plane perpendicular to the optical axis of the lens, and holds the lens frame An adhesive portion that is fixed to the frame, and the lens frame has a contact surface that contacts the reference surface and a diameter that increases toward the bottom when the direction from the contact surface toward the reference surface is downward. The outer peripheral inclined surface has an outer peripheral inclined surface that moves and adjusts the position of the lens frame along the reference surface by receiving a vertical external force that is an external force perpendicular to the optical axis. It has an upward surface, and at least a part of the adhesive portion is raised above the upward surface and is provided between the upward surface and the outer peripheral surface of the lens frame located above the upward surface. It is characterized by.

  In the lens device according to the present invention, the lower end of the outer peripheral inclined surface is positioned below the upward surface, and the adhesive portion is provided over the upper surface.

  In the lens device according to the present invention, the lens frame may have a concave portion below the lower end of the outer peripheral inclined surface, and a part of the adhesive portion may be provided in the concave portion.

  In the above case, the concave portion is preferably a concave groove provided on the entire circumference of the lens frame.

  Further, in the lens device according to the present invention, the holding frame has a cylindrical portion surrounding the outer peripheral inclined surface, the cylindrical portion has an opening provided as an adhesive port for filling the adhesive, and the upward surface is an adhesive port. It is preferable that it is a part of surface which forms the provided opening.

  In the above case, it is preferable that a plurality of adhesive portions are provided apart from each other in the circumferential direction of the lens frame, and an opening provided as an adhesive port is provided at a position corresponding to each adhesive portion. Furthermore, it is preferable that the adhesive portions are provided at intervals of 120 degrees in the circumferential direction of the lens frame.

  The above “opening provided as an adhesive port for filling an adhesive” means an opening that can be used as an adhesive port. The opening provided as the bonding port can be formed in any shape that can be filled with an adhesive, and can be, for example, a through hole or a notch provided at a position facing the outer peripheral inclined surface of the cylindrical portion. .

  The phrase “an opening provided as an adhesive port is provided at a position corresponding to the adhesive portion” means that the adhesive port is located at a position where the adhesive portion can be filled with the adhesive. Note that there may be one or more bonding ports for one adhesive part.

  Further, in the lens device according to the present invention, when the holding frame has a cylindrical portion surrounding the outer peripheral inclined surface, and the cylindrical portion has an opening provided as an adhesive port for filling the adhesive, the cylindrical portion is inclined at the outer peripheral It is preferable to have an opening provided as a lens frame position adjusting port for applying an external force in the vertical direction at a position facing the surface.

  In the above case, it is preferable that a plurality of openings provided as lens frame position adjustment ports are provided at equal intervals in the circumferential direction of the cylindrical portion. Furthermore, it is preferable that the openings provided as the lens frame position adjusting ports are provided at intervals of 120 degrees in the circumferential direction of the cylindrical portion.

  The above “opening provided as a lens frame position adjusting port for applying an external force in the vertical direction” is an opening through which an external force in the direction perpendicular to the optical axis can be applied to the outer peripheral inclined surface by inserting some member such as a position adjusting jig. Means. The opening provided as the lens frame position adjustment port can be formed into an arbitrary shape into which a position adjustment jig or the like can be inserted.For example, a through hole or a cut provided at a position facing the outer peripheral inclined surface of the cylindrical portion is provided. It can be a lack.

  Further, in the lens device according to the present invention, when the holding frame has a cylindrical portion that surrounds the outer peripheral inclined surface, and the cylindrical portion has an opening provided as an adhesive port for filling the adhesive, it is above the adhesive portion. It is preferable that an additional adhesive part is provided, and the adhesive amount of the adhesive part is larger than the adhesive amount of the additional adhesive part.

  In the above case, a part of the surface that forms the opening provided as the bonding port is a downwardly facing downward surface, and the additional adhesive portion is only above the downwardly facing surface of the inner peripheral surface of the cylindrical portion and the lens frame. It is preferable to be provided between the outer peripheral surface.

  The above “provided between the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the lens frame only above the downward surface” means that the region where the further adhesive portion contacts the cylindrical portion and the lens frame is the same as the downward surface. Means it exists only at or above the location.

  In the lens device according to the present invention, the upward surface may be the upper end surface of the holding frame.

  According to the lens device of the present invention, a lens, a lens frame that holds the outer periphery of the lens, a holding frame that holds the lens frame in contact with the lens frame on a reference plane perpendicular to the optical axis of the lens, and a lens frame are provided. An adhesive portion that is fixed to the holding frame, and the lens frame has a contact surface that contacts the reference surface and a diameter that increases toward the bottom when the direction from the contact surface toward the reference surface is downward. An outer peripheral inclined surface that has an outer peripheral inclined surface that moves and adjusts the position of the lens frame along the reference plane by receiving a vertical external force that is an external force perpendicular to the optical axis. And at least a part of the adhesive portion is raised above the upward surface and provided between the upward surface and the outer peripheral surface of the lens frame positioned above the upward surface. .

  According to the present invention, at least a part of the adhesive portion is raised on the upward surface provided on the holding frame, and between the upward surface and the outer peripheral surface of the lens frame positioned above the upward surface. Therefore, the stress of the adhesive part can be applied in the direction in which the lens frame is pressed against the reference surface of the holding frame that holds the lens frame, and the lens frame is used as the reference surface of the holding frame with a simple structure. The urging force to be pressed can be continued.

It is sectional drawing of the lens apparatus which concerns on one Embodiment of this invention. It is a perspective view of the holding frame of FIG. It is the elements on larger scale of FIG. It is a 1st modification of the holding frame of FIG. It is a 2nd modification of the holding frame of FIG. It is a 3rd modification of the holding frame of FIG. It is a 1st modification of the lens frame of FIG. It is a 2nd modification of the lens frame of FIG. It is a 3rd modification of the lens frame of FIG. It is a modification of a lens apparatus.

  FIG. 1 is a cross-sectional view taken along a plane including an optical axis of a lens apparatus 1 according to an embodiment of the present invention. Hereinafter, as an embodiment according to the present invention, an example in which the present invention is applied to an industrial camera lens device 1 which is a so-called MV / FA (Machine Vision / Factory Automation) camera will be described. In FIG. 1, the upper side is the object side, and the lower side is the image side. Moreover, the same code | symbol is attached | subjected to the element corresponding in each figure, and detailed description is abbreviate | omitted.

  The lens device 1 is attached to a camera body (not shown) via a mount member (not shown) at the lower end in FIG. In the camera body, an imaging element (not shown) such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) (not shown) is arranged on the imaging plane of the optical system housed in the lens device 1.

  As shown in FIG. 1, the lens apparatus 1 includes a first lens group L1, a first lens frame 12 that holds the outer periphery of the first lens group L1, a holding frame 13 that holds the first lens frame 12, 2 lens group L2, the 2nd lens frame 14 holding the outer periphery of the 2nd lens group L2, the lens barrel main body 11, and the adhesive part C which fixes the 1st lens frame 12 to the holding frame 13 are provided. Here, the first lens unit L1 corresponds to the lens of the present invention, and the first lens frame 12 corresponds to the lens frame of the present invention.

  The optical system attached to the lens apparatus 1 includes, in order from the object side, a first lens group L1 that is a fixed lens group, a second lens group L2, a first lens group L1, and a second lens group L2 that are fixed lens groups. 2 is an optical system having a two-group configuration including a diaphragm (not shown) disposed between the two. Various optical systems can be adopted as the optical system attached to the lens apparatus 1 according to required items. For example, the optical system may be configured as a rear focus type or inner focus type fixed focus optical system. In this case, a known configuration such as a mechanism for performing focusing by moving in the optical axis direction by a voice coil motor or the like, a position sensor, a driving unit, and a control unit may be provided. The optical system may be configured to include a lens hood or various filters as necessary.

  The lens barrel body 11 is a cylindrical member that supports the first lens frame 12 and the second lens frame 14 whose positions have been adjusted. The second lens frame 14 that holds the outer periphery of the second lens unit L2 is inserted into and supported by the lens barrel body 11. The first lens frame 12 that holds the outer periphery of the first lens unit L1 is held by a holding frame 13. A holding frame 13 that holds the first lens frame 12 is fixed to and supported by the lens barrel body 11 with screws 15 at intervals of 120 degrees.

  FIG. 2 is a perspective view of the holding frame 13. The holding frame 13 has a cylindrical shape and includes a reference surface 13A perpendicular to the optical axis Z on the inner periphery. The holding frame 13 has a cylindrical portion 13B that surrounds a later-described outer peripheral inclined surface 12A of the first lens frame 12 in a state where the first lens frame 12 is in contact with the reference surface 13A. As shown in FIGS. 1 and 2, the cylindrical portion 13B is a cylindrical portion extending from the radially outer side of the reference surface 13A to the object side in parallel to the optical axis Z. Further, on the outer periphery of the holding frame 13, a screw hole 13E for fixing the lens barrel body 11 is provided.

  The region surrounded by the cylindrical portion 13B is a region in which a part of the first lens frame 12 is accommodated, and the inner diameter of the cylindrical portion 13B is formed larger than the outer diameter of the first lens frame 12. For this reason, a gap is provided between the outer peripheral portion of the first lens frame 12 and the cylindrical portion 13B. Accordingly, the first lens frame 12 is movable in a direction perpendicular to the optical axis Z while being in contact with the reference surface 13A.

  FIG. 3 is a partially enlarged view of FIG. 1 and shows the adhesive portion C of the first embodiment.

  As shown in FIGS. 1 and 3, the first lens frame 12 includes a contact surface 12B perpendicular to the optical axis Z, and contacts the reference surface 13A of the holding frame 13 at the contact surface 12B. The first lens frame 12 is an outer peripheral inclined surface 12A having a diameter that increases in the downward direction when the direction from the contact surface 12B toward the reference surface 13A is downward, and is perpendicular to the optical axis Z. By receiving a vertical external force, which is an external force, there is an outer peripheral inclined surface 12A that moves and adjusts the position of the lens frame along the reference surface.

  Since the outer peripheral inclined surface 12 </ b> A has an inclination, the first lens frame 12 receives an external force from the position adjusting jig S on the outer peripheral inclined surface 12 </ b> A, whereby the contact surface 12 </ b> B of the first lens frame 12 is the reference of the holding frame 13. The position is adjusted in the direction perpendicular to the optical axis while being pressed against the surface 13A. Specifically, when an external force is applied from the position adjusting jig S toward the outer peripheral inclined surface 12A, the component force in the optical axis direction of the external force presses the contact surface 12B of the first lens frame 12 against the reference surface 13A ( 3), and the component force in the direction perpendicular to the optical axis of the external force acts to push the first lens frame 12 toward the optical axis Z. For this reason, the first lens frame 12 can move in the direction perpendicular to the optical axis along the reference surface 13A while being pressed against the reference surface 13A.

  The external force applied to the outer peripheral inclined surface 12A has a component that is perpendicular to the optical axis Z toward the optical axis, and presses the contact surface 12B of the first lens frame 12 against the reference surface 13A of the holding frame 13. Yes, as long as the position of the first lens frame 12 is moved and adjusted along the reference surface 13A. For example, the external force applied to the outer peripheral inclined surface 12 </ b> A may have an inclination with respect to the optical axis Z.

  Further, when the direction parallel to the optical axis Z and directed from the contact surface 12B toward the reference surface 13A (the direction indicated by the arrow W in FIG. 3) is downward, the holding frame 13 is upwardly upward 13C. Have

  Here, the holding frame 13 is provided with an upward surface 13 </ b> C as a part of a surface forming an opening provided in the holding frame 13. More specifically, in the example of FIG. 1, an upward portion of a surface forming an opening (adhesion opening Q) provided as an adhesive opening in the holding frame 13 is an upward surface 13 </ b> C. By using a part of the surface that forms the bonding opening Q as the upward surface 13C as it is, an adhesive portion C described later is easily and suitably disposed between the upward surface 13C and the outer peripheral surface of the first lens frame 12. (Not shown in FIG. 1) can be provided.

  The adhesive portion C is an adhesive that fixes the first lens frame 12 and the holding frame 13 together. At least a part of the adhesive portion C is provided between the upward surface 13C and the outer peripheral surface of the first lens frame 12 that is positioned above the upward surface 13C. .

  The adhesive portion C is cured by allowing an adhesive to flow between the outer peripheral surface of the first lens frame 12 and the holding frame 13 in a state where the position is adjusted while pressing the first lens frame 12 against the reference surface 13A. It is formed by. Further, stress is generated in the adhesive part C in the process of curing and shrinking. Here, at least a part of the adhesive portion C is raised on the upward surface 13C and is provided between the upward surface 13C and the outer peripheral surface of the first lens frame 12 positioned above the upward surface 13C. It has been. As a result, when the adhesive portion C is cured and contracted, a force (stress) is generated that pulls the outer peripheral surface of the first lens frame 12 positioned above the upward surface 13C toward the upward surface 13C. By using the stress of the adhesive portion C, it is possible to apply an urging force to press the first lens frame 12 against the reference surface 13A with a simple structure.

  If it is a range which has the said effect | action, you may vary suitably the number, magnitude | size, position, shape, etc. of the adhesive part C and the upward surface 13C. For example, the upward surface 13C may be provided only in the vicinity of the bonding port where the adhesive portion C is provided, and the upward surface 13C may not be provided at other positions. In addition, the adhesive portion C has a portion raised upward in at least a part of the upward surface 13C as long as the first lens frame 12 has a function of applying an urging force that presses against the reference surface 13A. There may be a portion provided between the upward surface 13C and the outer peripheral surface of the first lens frame 12 positioned above the upward surface 13C.

  The upward surface 13C may have an arbitrary configuration as long as it is an upward surface extending outward in the radial direction from the outer peripheral surface of the first lens frame 12 (centered on the optical axis Z). For example, in the upward surface 13C, the normal line of the upward surface 13C is substantially parallel to the optical axis Z. Further, the upward surface 13C may be a flat surface or a curved surface, or a surface obtained by combining a plurality of surfaces selected from a flat surface and a curved surface.

  4 to 6 are views showing first to third modifications of the holding frame 13 of FIG. For example, in FIG. 2, the bonding opening Q is a through-hole, but in FIGS. 4 and 5, the bonding opening Q is formed by a notch, and an upward surface of the surfaces that form the bonding opening Q. This is an example in which a part of is an upward surface 13C.

  Further, the upward surface 13 </ b> C may be the upper end surface of the holding frame 13. For example, as shown in FIG. 6, the upper surface 13C can be used as the upper end surface of the cylinder part 13B by setting the upper end surface of the cylinder part 13B at a position corresponding to the outer peripheral inclined surface 12A. Also in this case, the upward surface 13C can be provided on the holding frame 13 with a simple structure, and the adhesive portion C is provided between the upward surface 13C and the outer peripheral surface of the first lens frame 12 simply and preferably. be able to. 4 to 6 is the same as the example shown in FIGS. 1 to 3 except for the configuration described above.

  Returning to FIG. 3, the description will be continued. The lens device 1 may include a further adhesive part C1 above the adhesive part C. In this case, it is preferable that the adhesive amount of the adhesive part C is larger than the adhesive amount of the further adhesive part C1. Since the stress caused by the adhesive of the adhesive part C that applies the downward urging force to the first lens frame 12 can be strengthened than the stress caused by the adhesive of the further upper adhesive part C1, it is possible to secure the downward urging force. it can. In order to ensure this effect, a plurality of one or both of the lower adhesive portion C (adhesive portion C at least part of which is bonded to the upward surface 13C) and the upper adhesive portion C1 are provided. In this case, it is desirable that the total amount of adhesive in the lower adhesive portion C is larger than the total amount of adhesive in the upper adhesive portion C1.

  In addition, when only the lower adhesive part C is provided, it is preferable from the viewpoint of repairability (decomposability) because an area to be bonded can be prevented from being increased more than necessary. Further, when the upper adhesive portion C1 and the lower adhesive portion C are provided, the adhesive amount of the adhesive pool C is made larger than the adhesive amount of the further adhesive portion C1, so that the downward direction The first lens frame 12 can be securely fixed by the holding frame 13 while maintaining the urging force.

  Also, as shown in FIG. 3, a part of the surface forming the bonding opening Q is a downward downward surface 13D, and the further adhesive portion C1 is inside the cylinder portion 13B only above the downward surface 13D. It is preferably provided between the peripheral surface and the outer peripheral surface of the first lens frame 12. In the further adhesive portion C1, it is possible to prevent a force that pulls the outer peripheral surface of the first lens frame 12 toward the downward surface 13D from the internal stress generated in the process of curing and shrinking of the adhesive. . Accordingly, it is possible to securely fix the first lens frame 12 by the holding frame 13 while maintaining the urging force of the adhesive portion C pressing the first lens frame 12 against the reference surface 13A.

  The 1st lens frame 12 can be made into arbitrary outer peripheral shape in the range in which the adhesive agent part C below is provided at least. In FIG. 3, the lower end 12E of the outer peripheral inclined surface 12A is positioned above the upward surface 13C, and at least a part of the adhesive portion C is raised on the upward surface 13C to be the upward surface 13C and the upward surface. It is provided between the outer peripheral surface of the first lens frame 12 positioned above 13C. In this case, as described above, the first lens frame 12 can be favorably biased toward the reference surface 13A by the stress caused by the adhesive portion C raised on the upward surface 13C.

  7 to 9 are views showing first to third modifications of the first lens frame 12 of FIG. The first and second modifications are examples in which the shape of the outer peripheral surface of the first lens frame 12 is different from that in FIG. 3, and the other configurations are the same as those in FIG. The third modification is an example in which the shape of the outer peripheral surface of the first lens frame 12 and the shape of the upward surface 13C of the holding frame 13 are different from those in FIG. 3, and other configurations are the same as those in FIG.

  As shown in FIG. 7, the lower end 12E of the outer peripheral inclined surface 12A may be positioned below the upward surface 13C, and the adhesive portion C may be provided over the upper surface 13C. In this case, a gap between the outer peripheral inclined surface 12A and the inner peripheral surface of the holding frame 13 is generated by positioning the lower end 12E of the outer peripheral inclined surface 12A below the upward surface 13C. By filling the gap also with an adhesive to form an adhesive portion C, the space between the upward surface 13C and the outer peripheral surface of the first lens frame 12 above the upward surface 13C, and the upward surface 13C A part of the adhesive portion C can be provided both between the first lens frame 12 and the outer peripheral surface below the facing surface 13C. Thereby, the adhesive amount of the adhesive part C can be secured with a simple shape.

  As shown in FIG. 8, the first lens frame 12 may have a recess 12C below the lower end 12E of the outer peripheral inclined surface 12A, and a part of the adhesive part C may be provided in the recess 12C. In this case, since the adhesive can be filled in the gap between the recess 12C and the holding frame 13, the amount of adhesive in the adhesive part C can be ensured. The recesses 12C can have any shape and number that can be used as the adhesive part C. In the example of FIG. 8, the concave portion 12 </ b> C is a concave groove provided on the entire circumference of the first lens frame 12. In this case, the adhesive amount of the adhesive part C can be suitably secured with a simple structure. The concave groove can have an arbitrary cross-sectional shape. For example, in the example of FIG. 8, the cross-sectional groove has a V-shaped cross section, but may have a U-shaped cross section. Further, a plurality of concave grooves may be provided to further secure the adhesive amount of the adhesive part C.

  As shown in FIG. 9, the first lens frame 12 has a further inclined surface 12F whose diameter decreases downwardly from the lower end 12E of the outer peripheral inclined surface 12A, and is provided on the inner peripheral side of the upward surface 13C. A part thereof is an upward inclined surface 13Ca whose normal vector is inclined with respect to the optical axis Z, and a part of the adhesive portion C is interposed between the upward inclined surface 13Ca and the further inclined surface 12F. It may be provided. In this case, since the adhesive can be filled between the upward inclined surface 13Ca and the further inclined surface 12F, the adhesive amount of the adhesive portion C can be ensured.

  Further, as in the example shown in FIG. 2 and the like, the cylindrical portion 13B has a lens frame position adjustment in which a position adjusting jig S is inserted at a position facing the outer peripheral inclined surface 12A and an external force perpendicular to the optical axis Z is applied. It is preferable to provide an opening (position adjustment opening P) provided as a mouth. In this case, with the holding frame 13 having a simple shape, the position adjustment jig S is brought into contact with the outer peripheral inclined surface 12A via the position adjustment opening P, and the position is suitably adjusted. The adhesive can flow into the gap between the first lens frame 12 and the holding frame 13 through the bonding opening Q. Further, since the bonding opening Q and the position adjustment opening P are provided at positions corresponding to the optical axis direction, the first lens frame 12 and the holding frame 13 are preferably maintained while maintaining the position adjustment. It can be fixed.

  In the lens device 1 of each embodiment, it is preferable that a plurality of adhesive portions C are provided apart from each other in the circumferential direction, and an adhesive opening Q is provided at a position corresponding to each adhesive portion C. In this case, the adhesive portion C can be provided so that the urging force can be obtained in a well-balanced direction from the equally spaced direction toward the outer peripheral inclined surface 12A. In order to enhance this effect, for example, as shown in FIG. 2 and the like, it is preferable that the adhesive portions C are provided at intervals of 120 degrees in the circumferential direction. In addition, it is preferable that two or more adhesive portions C are provided so as to be fixable in two directions, and it is preferable that the number is 3 or more.

  In the holding frame 13, it is preferable that a plurality of position adjustment openings P are provided at equal intervals in the circumferential direction of the cylindrical portion 13B. In this case, it is possible to adjust the position by urging the force in a balanced manner toward the outer peripheral inclined surface 12A from the equally spaced direction. In order to enhance this effect, for example, as shown in FIG. 2, it is preferable that the position adjustment openings P are provided at intervals of 120 degrees in the circumferential direction of the cylindrical portion 13B. Further, when the position adjustment is performed on the three position adjustment openings P by using an axial position adjustment jig S such as an adjustment pin that can be moved back and forth with a screw, each adjustment pin is suitably used for the outer peripheral inclined surface 12A. Since it can be abutted, the position can be adjusted stably. Further, it is preferable that two or more position adjustment openings P are provided so that the positions can be adjusted in two directions, and the number may be three or more.

  In the holding frame 13 of FIG. 2, openings having the same shape are provided at six locations at intervals of 60 degrees in the circumferential direction as through holes penetrating from the inner peripheral surface to the outer peripheral surface of the holding frame 13. If the position adjustment opening P has a shape into which a position adjustment member such as the position adjustment jig S can be inserted, and the bonding opening Q can be filled with an adhesive, the position adjustment opening P and the bonding opening Q may have any size or shape, and the size or shape may be different between the position adjustment opening P and the bonding opening Q.

  As a modified example of the holding frame 13, the cylindrical portion 13 </ b> B is provided with a long hole R having a width in the circumferential direction at a position facing the outer peripheral inclined surface 12 </ b> A. And may be used as the position adjustment opening P. For example, as shown by a broken line in FIG. 2, one end portion in the circumferential direction of the long hole R is used as the bonding opening Q, and the other end portion in the circumferential direction of the long hole R is used as the position adjusting opening P. Also good. In this case, the holding frame 13 can have a simpler shape.

  As shown in FIG. 2, the holding frame 13 is a cylindrical member configured as a separate member from the lens barrel body 11 in the present embodiment. For this reason, it is easy to manufacture the holding frame 13 with a simple structure. If the holding frame 13 includes a reference surface 13A perpendicular to the optical axis Z and an upward surface 13C, the holding frame 13 is configured not as a separate member of the lens barrel body 11 but as a part of the lens barrel body 11. Also good.

  The outer peripheral inclined surface 12A has an inclination in which the diameter increases as it goes downward when the direction from the contact surface 12B toward the reference surface 13A is downward, and receives an external force perpendicular to the optical axis Z. Accordingly, the first lens frame 12 is inclined in a direction in which the position of the first lens frame 12 is moved and adjusted along the reference surface 13A by generating a force in a direction in which the first lens frame 12 is pressed toward the reference surface 13A in the optical axis direction. If there is, it may be configured to have an arbitrary inclination within a range in which the movement of the first lens frame 12 can be adjusted.

  For example, the outer peripheral inclined surface 12A can be provided with an inclination such that the distance from the optical axis Z increases as it approaches the reference surface 13A, as in the example illustrated in FIG. FIG. 10 shows a modification of the lens device 1. As in the example illustrated in FIG. 10, the outer peripheral inclined surface 12 </ b> A may be provided with an inclination in which the distance from the optical axis Z decreases as the distance from the reference surface 13 </ b> A increases. The outer peripheral inclined surface 12A has an inclination in which the diameter increases in the direction from the contact surface 12B toward the reference surface 13A in both cases of FIG. 1 and FIG. It has a structure that can be moved along the reference surface 13A while being pressed toward the surface 13A.

  Hereinafter, a process of assembling the lens device 1 as described above will be described. When the lens apparatus 1 is assembled, the lens apparatus 1 is arranged so that the lens barrel body 11 has the axis as the vertical direction. Then, the second lens frame 14 that holds the outer periphery of the second lens unit L2 is inserted into the lens barrel body 11, and the axis is tilted by a known method so that the optical axis Z coincides with the axis of the lens barrel body 11. Is corrected and fixed in a position-adjusted state. In this state, the holding frame 13 is fixed to the lens barrel body 11 with screws 15.

  Next, the first lens frame 12 is inserted into the holding frame 13 of the lens barrel body 11. Then, the contact surface 12B of the first lens frame 12 is brought into contact with the reference surface 13A of the holding frame 13, and the measured values and images are observed using an MTF (Modulation Transfer Function) measuring machine or the like, as shown in FIG. Thus, the first lens frame 12 is moved in the direction perpendicular to the optical axis by inserting an axial position adjusting jig S into each position adjusting opening P and abutting it toward the outer peripheral inclined surface 12A to move back and forth. Adjust the position.

  Next, when the position adjustment is completed, the position adjustment jig S is brought into contact with the outer peripheral inclined surface 12A from each position adjustment opening P (the contact surface 12B of the first lens frame 12 is in contact with the holding frame 13). In a state of being pressed against the reference surface 13A), the adhesive dispenser T is inserted from the bonding opening Q (see FIG. 2) of the holding frame 13. Then, an adhesive which is an ultraviolet curable resin is applied from the adhesive dispenser T so that the adhesive reaches the upward surface 13C of the holding frame 13 and the outer peripheral surface of the first lens frame 12 above the upward surface 13C. Inflow. Then, the adhesive dispenser T is separated from the bonding opening Q, and ultraviolet light from an ultraviolet light irradiation unit (not shown) is irradiated from the bonding opening Q for a predetermined time. As a result, as shown in FIG. 3, at least a part of the adhesive portion C is raised on the upward surface 13C and is positioned above the upward surface 13C and the upward surface 13C. It is provided between the outer peripheral surfaces. Moreover, the same adhesive agent part C is provided in three places in the circumferential direction.

  As described above, according to the lens device 1, the reference surface 13A of the holding frame 13 is urged by biasing the position adjusting jig S toward the outer peripheral inclined surface 12A through the position adjusting opening P of the holding frame 13. The position of the first lens frame 12 to be adjusted can be suitably adjusted with respect to the holding frame 13 while pressing the contact surface 12 </ b> B of the first lens frame 12. Further, with the position adjusted, at least a part of the adhesive portion C is raised above the upward surface 13C as described above, and the first lens is positioned above the upward surface 13C and the upward surface 13C. Since it is provided between the outer peripheral surface of the frame 12, even after the position adjusting jig S is removed, the urging force that presses the lens frame against the reference surface of the holding frame that holds the lens frame with a simple structure. Can continue.

  Further, since the urging force that presses the lens frame against the reference surface of the holding frame that holds the lens frame can be continued, the lens device 1 can be improved in resistance to vibration. For example, the lens device 1 is used in an environment in which vibration or shaking is likely to occur. The lens apparatus 1 can be suitably applied to an industrial camera that is an MV / FA camera. An industrial camera must satisfy the requirement that it will not cause out-of-focus even if it is used for a long time because it will cause the production efficiency of the factory to be greatly reduced if an error that cannot accurately read the subject to be photographed occurs. I must. Furthermore, it is often used by being attached to the tip of a mechanical arm, and it is necessary to satisfy the above requirements while being used in an environment in which vibration and shaking are likely to occur. Since the present invention can always maintain a state where the lens is held at the reference position, it is less likely to be out of focus and is suitable for satisfying the requirements of industrial lenses.

  The lens frame and the lens frame according to the present invention are not limited to the above example, and the combination of any lens frame provided in the lens device 1, the holding frame for the lens frame, and the adhesive portion for fixing the lens frame and the holding frame. The structure of the adhesive part which adheres the holding frame, lens frame, and holding frame to hold | maintain is applicable.

  For example, in order from the object side, the space in the optical axis direction is limited by providing adjacent lens groups such as a second lens group of a three-group optical system including a first lens group, a second lens group, and a third lens group. It is preferable to apply the present invention to the adjusted lens group as a lens group to be adjusted. For example, since the second lens group includes another lens group adjacent to the optical axis direction, there is no space provided with a structure for applying an urging force in the optical axis direction to the second lens group, and the lens frame is used as the reference plane. It is difficult to apply the force to press against. In such a case, a second lens frame that holds the second lens group, a second holding frame that is a holding frame for the second lens frame, and an adhesive portion that fixes the second lens frame and the second holding frame to each other. By applying the present invention, it is possible to adjust the position of the second lens frame by applying a vertical external force to the outer peripheral inclined surface of the second lens frame regardless of whether there is a space around the lens group to be adjusted. In addition, an external force that presses the lens frame against the reference surface can be applied even after bonding, which is effective.

  Also, in order from the object side, the space in the optical axis direction is limited by providing adjacent lens groups such as the second lens group of the optical system having a three-group configuration of the first lens group, the second lens group, and the third lens group. When the present invention is applied to the lens group to be adjusted as a lens group to be adjusted, the holding frame of the second lens group includes a cylindrical portion that surrounds the outer peripheral inclined surface, and the cylindrical portion is provided as an adhesive port for filling the adhesive It is preferable that the upper surface is a part of a surface forming an opening provided as an adhesive opening. In this case, since there is another lens group adjacent to the optical axis direction, even if the space for allowing the adhesive to fix the second lens group to flow in cannot be secured in the optical axis direction, The adhesive can be suitably flown from the opening provided as the bonding port.

  The lens apparatus according to the present invention is not limited to the above-described embodiment, and is applicable to various arbitrary camera apparatuses such as a digital camera, a video camera, a surveillance camera, a broadcast camera, a mobile phone camera, a tablet terminal camera, and an in-vehicle camera. Is possible. The optical system attached to the lens device may be a variable magnification optical system, a fixed focus optical system, or an arbitrary group configuration. In addition, each lens group constituting the optical system may be composed of an arbitrary number of one or more, and an arbitrary material and shape can be adopted for each lens.

  Although the lens device of the present invention has been described in detail above, the present invention is not limited to the above examples, and various improvements and modifications may be made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Lens apparatus 11 Lens barrel body 12 1st lens frame 12A Outer peripheral inclined surface 12B Contact surface 12C Recess 12E Lower end 13 Holding frame 13A Reference surface 13B Tube part 13C Upward surface 13Ca Upward inclined surface 13Ca
13D Downward surface 13E Screw hole 14 Second lens frame 15 Screw C Adhesive part C1 Further adhesive part L1 First lens group L2 Second lens group P Opening provided as a lens frame position adjustment opening (position adjustment opening)
Q Opening provided as an adhesive opening (adhesion opening)
R Long hole S Position adjustment jig T Adhesive dispenser W Arrow Z Optical axis

Claims (13)

A lens,
A lens frame for holding the outer periphery of the lens;
A holding frame that holds the lens frame in contact with the lens frame at a reference plane perpendicular to the optical axis of the lens;
An adhesive portion for fixing the lens frame to the holding frame;
When the lens frame is a contact surface that contacts the reference surface and a direction from the contact surface toward the reference surface is downward, the outer peripheral inclined surface has a diameter that increases toward the bottom. An outer peripheral inclined surface that moves and adjusts the position of the lens frame along the reference surface by receiving a vertical external force that is an external force perpendicular to the axis;
The holding frame has an upward upward surface, and at least a part of the adhesive portion is raised on the upward surface, the upward surface and the lens frame positioned above the upward surface. A lens device provided between the outer peripheral surface and the lens device.   The lens device according to claim 1, wherein a lower end of the outer peripheral inclined surface is positioned below the upward surface, and the adhesive portion is provided over the upper surface.   The lens device according to claim 1, wherein the lens frame has a concave portion below a lower end of the outer peripheral inclined surface, and a part of the adhesive portion is provided in the concave portion.   The lens device according to claim 3, wherein the concave portion is a concave groove provided on the entire circumference of the lens frame. The holding frame has a cylindrical portion surrounding the outer peripheral inclined surface, and the cylindrical portion has an opening provided as an adhesive port for filling an adhesive;
The lens device according to claim 1, wherein the upward surface is a part of a surface that forms an opening provided as the bonding port.   The lens device according to claim 5, wherein a plurality of the adhesive portions are provided apart from each other in a circumferential direction of the lens frame, and an opening provided as the adhesive opening is provided at a position corresponding to each of the adhesive portions.   The lens device according to claim 6, wherein the adhesive portions are provided at intervals of 120 degrees in the circumferential direction of the lens frame.   The said cylinder part has an opening provided as a lens frame position adjustment port for the said perpendicular direction external force provision in the said outer peripheral inclined surface in the position facing the said outer peripheral inclined surface. Lens device.   The lens apparatus according to claim 8, wherein a plurality of openings provided as the lens frame position adjusting ports are provided at equal intervals in a circumferential direction of the cylindrical portion.   The lens device according to claim 9, wherein openings provided as the lens frame position adjusting ports are provided at intervals of 120 degrees in a circumferential direction of the cylindrical portion. A further adhesive part is provided above the adhesive part,
The lens device according to claim 5, wherein an adhesive amount of the adhesive portion is larger than an adhesive amount of the further adhesive portion. A part of the surface that forms the opening provided as the bonding port is a downward downward surface,
The lens device according to claim 11, wherein the further adhesive portion is provided between the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the lens frame only above the downward surface.   The lens device according to claim 1, wherein the upward surface is an upper end surface of the holding frame.