JP2022034479A - Lens holding frame and method for manufacturing the same - Google Patents

Abstract

To provide a lens holding frame that can secure accuracy of fixing a lens and also can manufactured at lower cost by reducing the number of components and labor in steps.SOLUTION: A holding trench 21 is formed to insert an outer periphery part of a lens 50 in inner periphery surfaces of frame forming parts 2, 2 and spring parts 220a and 220b in a shape of a leaf spring elastically in contact with an outer periphery surface of the lens protrude from a bottom surface of the holding trench 21. The lens 50 is prevented from floating in a direction perpendicular to a direction of an optical axis in a lens holding frame 1 in such a manner that the spring parts 220a and 220b exhibit an elastic repelling force on the outer periphery surface of the lens 50 when the outer periphery part of the lens 50 is inserted into the holding trench 21 of the frame forming parts 2, 2.SELECTED DRAWING: Figure 1

Description

The present invention relates to a lens holding frame used for holding the outer peripheral portion of the lens and interchangeably mounting and fixing the lens to a predetermined device, and a method for manufacturing the same.

Conventionally, in a device such as a magnifying glass where the lens can be exchanged or an optical device in which the lens needs to be fixed, in order to accurately and stably mount and fix the target lens at the predetermined position, the outer circumference of the lens is used. It is mounted via a lens holding frame having a structure for fitting and holding the portion.

In addition, the lenses used in the optical equipment generally have dimensional tolerances during processing, but increasing the processing accuracy on the lens side to achieve high mounting accuracy leads to cost increase. Cheap. Therefore, various methods are used to improve the mounting accuracy of the lens on the frame body (mirror frame) side that holds the lens to eliminate problems such as rattling after mounting. For example, it is made of resin. In the lens holding frame of No. 1, in addition to the method of fixing the lens to the frame body side with an adhesive, as described in Japanese Patent Application Laid-Open No. 2015-16001, the frame body is screwed so as to be tightened in the diameter reduction direction. As described in Japanese Patent Application Laid-Open No. 2014-174224, a caulking method is known in which a caulking protrusion provided on a frame is thermally melted to fix a lens, and each method has a number of parts. It is possible to fix the lens to the frame while suppressing the increase in the lens, and in the metal lens holding frame, for example, as described in Japanese Patent Publication No. 7-26811, the lens mounted on the frame is pressed by the lens. By fixing it with a ring, high mounting accuracy is achieved while eliminating the rattling of the lens. Alternatively, as described in Japanese Patent Publication No. 3-71316, a method of fitting and fixing a lens in a lens holding frame made of a flexible material such as rubber is also known, while reducing the number of parts. It is possible to reduce the manufacturing effort.

However, the conventional bonding method, screwing method, and caulking method have a drawback that the number of manufacturing steps is increased and the cost is easily increased, and the cleanability and maintainability are easily deteriorated. Further, in the method of mounting the lens pressing ring, in addition to the process of threading the frame body and the fitting portion of the lens pressing ring, a process of surface treatment of the appearance is required, so that the cost is further high. It is easy to become.

On the other hand, in the method using a flexible lens holding frame such as a rubber material, the lens mounting work itself becomes easy, but for example, in the rubber frame of a square lens, when the long side is gripped, the rubber is released. It is easy to turn over and it is easy to hold the lens. As a countermeasure, it is conceivable to thicken the rubber frame or increase the hardness of the rubber, but this will result in a decrease in practicality as a flexible lens holding frame.

Japanese Unexamined Patent Publication No. 2015-16001 Japanese Unexamined Patent Publication No. 2014-174224 Jitsukaihei 7-26811 Gazette Jikkenhei 3-71316 Gazette

The present invention solves the above-mentioned problems, and provides a lens holding frame and a method for manufacturing the same, which can secure the mounting accuracy of the lens while reducing the number of parts and the labor in the process and suppressing the manufacturing cost. That is the issue.

The lens holding frame of the present invention made to solve the above problems is a lens holding frame including two frame components fitted to the outer peripheral portion of the lens from opposite directions and a connecting structure for connecting the two frame components. A holding groove for fitting the outer peripheral portion of the lens is formed on the inner peripheral surface of the frame component, and a plate that elastically contacts the bottom surface of the holding groove with respect to the outer peripheral surface of the lens. A spring-shaped spring portion is formed so as to project, and the spring portion exerts an elastic repulsive force against the outer peripheral surface of the lens in a state where the outer peripheral portion of the lens is fitted into the holding groove of the frame component. This is characterized in that the lens is prevented from idling in the lens holding frame in a direction perpendicular to the optical axis direction.

In the present invention, when the lens is held in the lens holding frame, the spring portion abuts on the outer peripheral surface of the lens and exerts an elastic repulsive force to exert light in the lens holding frame of the lens. It is configured to suppress idleness (so-called rattling) in the direction perpendicular to the axial direction (plane direction), and the spring portion absorbs the dimensional tolerance in the plane direction generated during processing of the lens, and then the outer peripheral surface of the lens. Since it comes into contact with the lens and is pressed by the elastic repulsive force to suppress rattling, there is no need for manufacturing labor or cost such as improving the processing accuracy on the lens side or tightening the frame in the reduced diameter direction. It is possible to suppress rattling only by abutting and connecting the two frame components.

Further, in the present invention, when the spring portion is formed so as to protrude from the bottom surface of the spring recess formed in the bottom surface of the holding groove, the spring portion is formed on the outer peripheral surface of the lens. By being pushed by the spring and accommodated in the spring recess, the outer peripheral surface of the lens can be brought into close contact with the entire bottom surface of the holding groove other than the spring recess, so that rattling due to the spring portion occurs. Moreover, it is possible to exhibit a sufficient spring function in which the spring portion housed in the spring recess always elastically presses against the outer peripheral surface of the lens.

Further, when the present invention is characterized in that the spring portion is formed so as to project vertically from the bottom surface and can be inclined and deformed toward the bottom surface side by an external force, the present invention is described from the beginning. It is possible to exert a large elastic force compared to the case where it is formed so as to project diagonally from the bottom surface, and since there is no undercut molding part in the spring part, it can be molded with a mold that does not require a slide mechanism. It is also possible to reduce the production cost.

Further, in the present invention, when the spring portion is formed so as to project diagonally outward and upward from the bottom surface, the spring portion is tilted from the beginning, so that it is not necessary to tilt and deform it by an external force, and the lens. By inserting the outer peripheral portion of the lens into the holding groove while sandwiching the lens, the spring portion elastically contacts the outer peripheral surface of the lens, and the spring action can be exerted on the outer peripheral surface of the lens. Efficiency can be improved.

Further, in the present invention, when the spring portion is inclined from the beginning, when the lens is inserted, depending on the formation position, as in the case where the spring portion is formed so as to project vertically from the bottom surface. It does not occur that the outer peripheral surface of the lens presses the spring portion in the vertical direction and the spring portion is crushed so that the elastic repulsive force cannot be exerted.

Furthermore, in the present invention, in the process of fitting the outer peripheral portion of the lens into the holding groove of the frame component, the spring portion is pressed against the outer peripheral surface of the lens and thus tilts toward the bottom surface side. When it is characterized by being deformed, the spring portion presses against the outer peripheral surface of the lens in the assembly process in which the outer peripheral portion of the lens is fitted into the holding groove while sandwiching the lens by the frame component. By being formed at a position where it is naturally tilted and deformed toward the bottom surface, the spring portion is pushed from the direction perpendicular to the lens and becomes crushed, and the lens is sandwiched without exhibiting springiness. In addition, there is no need for the work process of tilting the spring part diagonally by an external force in advance, and the spring part surely abuts on the outer peripheral surface of the lens and tilts and deforms toward the bottom surface while exerting an elastic repulsive force. Can be demonstrated.

In particular, in the present invention, the holding groove formed in the lens and the connected frame component is a quadrangle with rounded corners in a plan view, and the spring portion is a bent portion in the holding groove of the frame component. At the same time as being formed, the spring portion is formed so as to project in a direction parallel to the insertion direction of the lens, and the spring portion is formed on the outer periphery of the lens in the process of fitting the outer peripheral portion of the lens into the holding groove of the frame component. When the lens is tilted and deformed toward the bottom surface by being pressed against a surface, the spring portion is formed in a bent portion of a quadrangle with rounded corners, so that the lens is oriented in a direction perpendicular to the optical axis direction. Since the lens is pressed in the diagonal direction, the lens can be suppressed from moving more efficiently and reliably than when it is located in the straight portion of the rounded quadrangle.

Further, since the spring portion is formed so as to project in a direction parallel to the insertion direction of the lens at the bent portion, there is no undercut portion in the spring portion when the frame component is injection-molded, and the frame configuration is formed. It can be manufactured simply by removing the parts from the mold.

Moreover, by forming the spring portion in the bent portion in a direction parallel to the insertion direction of the lens, it is not necessary to incline the spring portion after manufacturing, and the lens is held by the frame component. By simply inserting the lens into the groove, the spring portion is pressed against the outer peripheral surface of the lens and naturally tilts and deforms toward the bottom surface in the opening direction of the frame component to elastically contact the outer peripheral surface of the lens. Therefore, the process from manufacturing the lens holding frame to fitting and holding the lens becomes extremely simple.

Furthermore, in the present invention, a ridge portion having elasticity is formed at a predetermined position on the side surface of the holding groove at a predetermined height, and the ridge portion has a dimensional tolerance assumed in the processing of the lens. The lens is arranged at a height and position that does not move in the optical axis direction with respect to the minimum side, and by inserting the outer peripheral portion of the lens into the holding groove, the lens comes into contact with the outer peripheral side surface of the lens. A lens with high accuracy by suppressing the lens from swinging in the optical axis direction in the holding groove of the lens holding frame while the ridge portion is crushed according to the magnitude of the dimensional tolerance. It is possible to reduce rattling of the lens in the optical axis direction, that is, in the thickness direction after assembly without the need for processing.

In addition, the connecting structure constituting the lens holding frame of the present invention is a combination of convex and concave shapes formed on both end faces of one frame component and both end faces of the other frame component. The convex shape is a connecting arm having a lens structure provided at the tip of the arm projecting from the end face, and the concave shape has a shape and a depth into which the connecting arm can be inserted by opening to the end face. At the same time, it is a connecting hole provided with a hooking structure for hooking the hook structure inside, and the frame constituent parts facing each other while sandwiching the lens on the inner peripheral side of the two frame constituent parts. By abutting the both end faces against each other and inserting the connecting arm into the connecting hole to hook the hook structure to the hooking structure, the two frame components are in close contact with each other. When it is decided to complete the connection work, the connection structure can be integrally formed as a part of the frame component, and the connection work is continuously performed with the work of fitting the lens into the lens holding frame. It is possible to realize a firm connection and fixed state while making it easy to perform in one work process. In particular, the connecting work is completed by simply inserting and hooking the convex shape of one end face into the concave shape of the other end face by butting the both end faces against each other. When holding the lens, steps such as screwing work, bonding work, caulking work, etc. are not required, and work jigs are also unnecessary, so manufacturing labor and cost are greatly reduced. High mounting accuracy can be achieved.

Further, in the present invention, when the two frame constituent parts have the same shape and the same size as each other, the parts constituting the frame body can be manufactured with only one type of mold, which is laborious and costly in manufacturing. Can be greatly reduced.

Furthermore, in the present invention, after the frame component whose spring portion projects vertically from the bottom surface is injection-molded, an external force is applied to the spring portion of the frame component to incline the frame component toward the bottom surface. According to the method of manufacturing a lens holding frame, which is characterized by projecting diagonally upward from the bottom surface, since there is no undercut molding part in the spring part of the frame component, it can be molded with a mold that does not require a slide mechanism. Not only can the production cost be reduced, but when the outer peripheral portion of the lens is fitted into the holding groove while sandwiching the lens, the spring portion does not collapse and elastically abuts on the outer peripheral surface of the lens to ensure the spring. It can exert its action.

Further, in the present invention, according to the method for manufacturing a lens holding frame, wherein the frame component and the connecting structure are integrally molded by injection molding of a hard synthetic resin, the lens holding frame is turned up like rubber. The lens is firmly held, and the manufacturing process and cost can be reduced.

According to the lens holding frame and the manufacturing method thereof according to the present invention, it is possible to improve the mounting accuracy of the lens while reducing the number of parts and the labor in the process and suppressing the manufacturing cost.

It is a perspective view which shows the preferable embodiment of the lens holding frame of this invention, (A) shows the state before assembling with the lens holding state, (B) is the state after assembling with the lens holding state. Is shown. FIG. 3 is a perspective view showing a detailed configuration of a pair of frame components constituting the lens holding frame of the embodiment shown in FIG. 1. FIG. 3 is a cross-sectional view for explaining a state in the holding groove when a lens is mounted on the frame component of the lens holding frame of the embodiment shown in FIG. 1, and a partially enlarged partial view thereof. FIG. 3 is a cross-sectional view showing a state in which the lens is inserted into the holding groove from the state of FIG. 3 until the lens abuts on the spring portion, and a partially enlarged partial view thereof. It is a cross-sectional view showing a state in which the lens is further inserted deeply from the state of FIG. 4 and the spring portion is compressed, and a partial view thereof is enlarged. A cross-sectional view and a part thereof for explaining a state in a holding groove when a lens is mounted on a frame component of a lens holding frame according to a different embodiment of the frame component of the lens holding frame of the present invention. It is an enlarged partial view. FIG. 3 is a perspective view for explaining a detailed configuration of a ridge portion formed in a frame component of the lens holding frame of the embodiment shown in FIG. 1, and an enlarged partial view thereof.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

FIG. 1 shows a preferred embodiment of the lens holding frame 1 in the present invention in which the lens and the connected frame component are rounded quadrangles, and holds the outer peripheral portion of the lens 50 to hold the outer peripheral portion of the lens 50, for example, the tip of an arm of a magnifying glass. It is used for applications such as means for mounting and fixing a lens on the side (not shown).

FIG. 1A shows a state before holding the convex lens 50 having a quadrangular rounded corner in the frame components 2 and 2 having a substantially U-shaped plan view, and the lens holding. The frame 1 is formed into a quadrangular frame shape with a rigid synthetic resin having flexibility and mechanical strength such as polypropylene (PP), and the holding groove 21 for inserting the outer peripheral portion of the lens 50 into the inner peripheral surface. It is equipped with.

Further, in the lens holding frame 1, as shown in FIG. 1 (A), two frame components 2 and 2 having the same shape and the same size are arranged and connected so as to be symmetrically opposed to each other on a plane, and are connected to each other in FIG. 1 (B). ), Each frame component 2 is formed in the shape of a square frame with a rounded square view that is exterior to the lens 50 when assembled, and each frame component 2 is an outer peripheral portion of the lens 50 having a rounded square shape to be held. Has a shape and size that can be held by inserting a range divided into two equal parts at the center position of the short side, and both end faces that are connected to each other are for connecting to the end face side of the frame component 2 to be combined. It has a connecting structure composed of a combination of connecting arms 22a and 22b having a convex shape and connecting holes 23a and 23b having a concave shape.

Then, in order to mount the two frame components 2 and 2 on the outer peripheral portion of the lens 50, the outer peripheral portion of the lens 50 to be held is held on the inner peripheral side facing the two frame components 2 and 2. The connecting arms 22a and 22b on the end face side of one frame component 2 are inserted into the connecting holes 23b and 23a on the end face side of the other frame component 2 while being sandwiched so as to be inserted into the grooves 21 and 21. The connection work is completed simply by inserting the connecting arms 22b, 22a on the end face side of the other frame component 2 into the continuous k-dwelling holes 23a, 23b on the end face side of one frame component 2, and FIG. 1 (B) ), The lens 50 is fixed in a holding state.

As described above, in the present embodiment, the frame body made of hard synthetic resin for fixing the lens 50 in a holding state is composed of two frame component parts 2 and 2 which are the same parts, and is connected to the end face side thereof. The lens 50 is held by providing a connecting structure and inserting the connecting arms 22a and 22b into the connecting holes 23b and 23a to complete the connecting work and adopting a method in which the lens 50 is fixed in a held state. The component parts of the frame body for fixing can be produced with only one type of mold, and the manufacturing cost of the lens holding frame 1 can be suppressed at a low cost.

Further, when holding and fixing the lens 50 in the connecting work of the frame constituent parts 2 and 2, steps such as screwing work, adhesive work, and caulking work are not required, and the lens 50 is used for the connecting work. Since no jig is required, it is easy to secure the lens mounting accuracy while further reducing the manufacturing labor and cost.

Explaining the connecting structure in more detail, in the present embodiment, as shown in FIG. 2, the tips of the connecting arms 22a and 22b projecting from both end faces of the frame component 2 having a U-shaped plan view are shown. The hook structures 221 and 222 are provided on the sides, respectively, and form a snap hook as a whole.

Further, a connecting hole 23a is opened on the end surface provided with the connecting arm 22a, and a connecting hole 23b is also opened on the end surface provided with the connecting arm 22b, and the connecting arm and the connecting hole are paired on one end surface. By arranging in, it is provided with four connecting structures as a whole, and even and reliable connection is realized, but the number of connecting structures is not limited to this.

The connecting holes 23a and 23b have a shape and a depth into which the connecting arms 22b and 22a can be inserted, and the hook structures 222 and 221 on the tip side of the connecting arms 22b and 22a are hooked inside the connecting holes 23a and 23b. By inserting the connecting arms 22b and 22a into the connecting holes 23a and 23b and hooking the hook structures 222 and 221 to the hooking structure, the facing end faces are in close contact with each other. It completes the connection work of the pair of frame components 2 and 2, and makes it possible to secure a firm connection state while facilitating the connection work by eliminating the need for screws and adhesives.

Further, since the connecting structure can be integrally molded by injection molding using a mold as a part of the frame component 2 which is a hard synthetic resin molded product, the number of parts and the work process are required to provide these. Not accompanied by an increase in.

As shown in FIG. 2, the connecting holes 23a and 23b have an opening on the outer peripheral surface of the frame component 2 at the tip end side thereof, and the hook structure 2222 of the connecting arms 22b and 22a is opened through the opening portion. By removing the 221 from the hook structure, the connected state can be released from the outside, so that the lens 50 can be easily held and released, and the lens can be easily replaced.

Further, the connecting structure is a snap hook with a connecting arm and a connecting hole, but the connecting structure of the present invention is not limited to this, and it is sufficient that two frame components 2 and 2 can be connected. Or other means such as adhering both end faces.

Further, in the lens holding frame 1 of the present embodiment, as shown in FIG. 3, a spring recess 211 is formed on the bottom surface of the holding groove 21 in the bent portion of the frame component 2, and the spring recess 211 is formed. On the bottom surface of the lens 50, leaf spring-shaped spring portions 210a and 210b that elastically abut against the outer peripheral surface of the lens 50 to be inserted are formed so as to project in a direction parallel to the insertion direction of the lens 50.

Then, as shown in FIG. 4, when the outer peripheral portion thereof is inserted in order to hold the lens 50 in the holding groove 21, the bottom surface of the spring recess 211 formed in the holding groove 21 toward the lens 50. When the outer peripheral surface of the lens 50 abuts on the tip of the protruding spring portions 210a and 210b and is inserted deeper, the spring portions 210a and 210b elastically hit along the angle R of the lens 50 as shown in FIG. While in contact with the spring recess 211, the frame component 2 is tilted and deformed toward the bottom surface in the opening direction.

At this time, since the tips of the spring portions 210a and 210b are formed at an acute angle, the spring portions 210a and 210b are likely to slide smoothly and deform when elastically deformed to the bottom surface side along the angle R of the lens 50 while abutting against the lens 50. ..

Further, since the spring portions 210a and 210b have a shape that protrudes in the bending portion in a direction parallel to the insertion direction of the lens, if the frame component is injection-molded and released in the lens insertion direction. , The spring portion has no undercut portion, and the frame component can be manufactured only by removing the frame component from the mold.

Moreover, the spring portions 210a and 210b are pressed against the outer peripheral surface of the lens 50 by simply inserting the lens 50 into the holding groove 21 of the frame component 2, and are naturally tilted and deformed to be the outer periphery of the lens. Since it will elastically abut on the surface, it is not necessary to incline the spring portion before inserting the lens after manufacturing, and the process from manufacturing the lens holding frame to fitting and holding the lens. Is extremely easy.

As described above, when the lens 50 is inserted into the holding groove 21 while being sandwiched between the inner peripheral sides of the frame components 2 and 2 and connected, the spring portions 210a and 210b are pushed by the outer peripheral surface of the lens 50 and are tilted and deformed. At the same time, since it exerts an elastic repulsive force so as to push back against the outer peripheral surface of the lens 50, even if each lens has a manufacturing dimensional tolerance, the spring portions 210a and 210b absorb the tolerance and the outer peripheral surface of the lens 50. By always elastically contacting the lens 50, the lens 50 held in the frame components 2 and 2 exhibits a function of preventing the lens 50 from floating in the holding grooves 21 and 21 in the width direction and causing rattling. ..

Further, in the present embodiment, since the spring portions 210a and 210b are formed in the holding groove 21 at the bent portion of the frame component 2, the elastic rebound force of the spring portions 210a and 210b acts in the diagonal direction of the lens 50. Therefore, as compared with the case where it works only in the opposite side direction, it is possible to efficiently suppress the movement and stabilize the holding, and it is extremely effective if it is formed at four bent portions.

Further, in the present embodiment, since the spring portions 210a and 210b are formed on the bottom surface of the spring recess 211 formed on the bottom surface of the holding groove 21, the outer peripheral surface of the lens 50 is the spring recess 211 of the holding groove 21. Even when the spring portions 210a and 210b are inserted until they come into contact with a bottom surface other than the above, the spring portions 210a and 210b exert an elastic repulsive force so as to push back the outer peripheral surface of the lens, are tilted and deformed while abutting, and are housed in the spring recess 211. Therefore, the outer peripheral surface of the lens 50 is not prevented from being in close contact with the bottom surface of the holding groove 21, and the lens 50 is stably held.

In the present embodiment, the spring portions 210a and 210b are inside the spring recess 211 and are inclined and deformed toward the bottom surface side in the opening direction of the frame component 2, but the spring portions 210a and 210b are in the opposite direction (frame component). It may be tilted and deformed in the depth direction of 2).

FIG. 6 shows different embodiments of each frame component 2 in the present invention, and the overall configuration is substantially the same as the embodiments shown in FIGS. 1 to 5, but has a leaf spring shape. The difference is that the spring portions 210c, 210c, 210c project in the vertical direction from the bottom surface of the holding groove 21 at the immediate side of the end of the frame component 2.

In this embodiment, the spring portions 210c, 210c, 210c protrude in the vertical direction from the immediate side at the end, so if the lens 50 is inserted as it is, the spring portions 210c, 210c, 210c are crushed on the outer peripheral surface of the lens 50. Before inserting the lens, it is necessary to apply an external force (for example, bend it by hand with a tool) and tilt it to the bottom side in advance as shown by the chain line in the figure, but it is manufactured by injection molding. It has the advantage of being economically superior because it can be manufactured with a mold that does not have an undercut portion and does not have a slide mechanism.

On the other hand, when the spring portion is formed so as to project diagonally from the bottom surface from the beginning (not shown), it is not necessary to tilt and deform the spring portion after manufacturing.

The spring portions 210a, 210b, 210c can also be easily and in large quantities by injection molding using, for example, a mold integrally formed with the main body portion of the frame component 2.

Furthermore, FIG. 7 shows another rattling prevention structure arranged in the holding groove 21 of each frame component 2 in the present embodiment, and shows the side surface of the holding groove 21 in each frame component 2. In addition, the protrusions 220a and 220b protruding at a predetermined height are integrally molded with the frame component 2.

The ridges 220a and 220b have a height that regulates the lens 50 so that it does not move in the optical axis direction, based on the dimensional tolerance on the minimum side in the thickness direction that is expected to occur in the processing process of the lens 50. It is arranged at a position, and when the outer peripheral portion of the lens 50 is fitted into the holding groove 21, the side surfaces of the outer peripheral portion of the lens come into contact with each other and the protrusions 220a and 220b are pressed, so that the tolerance in lens processing is increased. It is designed to exert a repulsive force while being crushed according to its size.

That is, the ridges 220a and 220b made of a rigid synthetic resin material that is integrally molded with the frame component 2 and has flexibility are crushed and repelled according to the thickness by the insertion operation of the lens 50. It exerts a function of suppressing the lens 50 from moving in the optical axis (thrust) direction, and reduces the occurrence of rattling in the optical axis direction of the lens 50. Therefore, in combination with the functions of the spring portions 210a, 210b, and 210c described above, the lens 50 to be fixed can be stably held in the lens holding frame without requiring high processing accuracy.

As described above, according to the present invention, it has become possible to sufficiently secure the lens mounting accuracy of the lens holding frame while reducing the number of parts and the labor in the process and suppressing the manufacturing cost.

Although the present embodiment shows the case where the present invention is carried out for a so-called square lens having a rounded quadrangle in a plan view, the present invention is not limited to the square lens but for a lens having a different shape such as a circular lens. Can be carried out in the same manner, and the material of the lens does not matter.

Further, in the present embodiment, since polypropylene (PP) is used as the synthetic resin material for molding the frame constituent parts 2 and 2, it is suitable in that it is easy to secure mechanical strength while having flexibility. Needless to say, other materials may be used, not limited to this.

1 lens holding frame, 2 frame components, 21 holding groove, 22a, 22b connecting arm, 23a, 23b connecting hole, 50 lens, 210a, 210b, 210c spring part, 220a, 220b ridge part, 211 spring recess, 221 , 222 Lens structure

Claims (11)

A lens holding frame having a connecting structure for connecting two frame components fitted to the outer peripheral portion of the lens from opposite directions and the two frame components.
A holding groove for fitting the outer peripheral portion of the lens is formed on the inner peripheral surface of the frame component, and a leaf spring-like spring that elastically contacts the bottom surface of the holding groove with respect to the outer peripheral surface of the lens. The portion is formed to protrude, and the spring portion exerts an elastic repulsive force against the outer peripheral surface of the lens in a state where the outer peripheral portion of the lens is fitted into the holding groove of the frame component. A lens holding frame characterized in that the lens is prevented from moving in a direction perpendicular to the optical axis direction within the lens holding frame. The lens holding frame according to claim 1, wherein the spring portion is formed so as to protrude from the bottom surface of the spring recess formed in the bottom surface of the holding groove. The lens holding frame according to claim 1 or 2, wherein the spring portion is formed so as to project vertically from the bottom surface and can be tilted and deformed toward the bottom surface side by an external force. The lens holding frame according to claim 1 or 2, wherein the spring portion is formed so as to project obliquely upward from the bottom surface. In the process of fitting the outer peripheral portion of the lens into the holding groove of the frame component, the spring portion is pressed against the outer peripheral surface of the lens, so that the spring portion is tilted and deformed toward the bottom surface side. The lens holding frame according to claim 1, 2, 3 or 4. The holding groove formed in the lens and the frame component connected to the frame component is a quadrangle with rounded corners in a plan view, and the spring portion is formed in a bent portion in the holding groove of the frame component and described above. The spring portion is pressed against the outer peripheral surface of the lens in the process of fitting the outer peripheral portion of the lens into the holding groove of the frame component, which is formed so as to project in a direction parallel to the insertion direction of the lens. The lens holding frame according to claim 1 or 2, wherein the lens is tilted and deformed toward the bottom surface side. A ridge portion having elasticity protruding at a predetermined height is formed at a predetermined position on the side surface of the holding groove, and the ridge portion is the lens with reference to the minimum side of the dimensional tolerance assumed in the processing of the lens. Is arranged at a height and a position where the lens does not move in the optical axis direction, and the ridge portion abutting on the outer peripheral side surface of the lens by inserting the outer peripheral portion of the lens into the holding groove has the dimension. 1. 2, 3, 4, 5 or 6, wherein the lens is prevented from moving in the optical axis direction in the holding groove of the lens holding frame while being collapsed according to the magnitude of the tolerance. Lens holding frame. The connecting structure is a combination of a convex shape and a concave shape formed on both end faces of the frame component on one side and both end faces of the frame component on the other side, and the convex shape projects from the end face. It is a connecting arm provided with a hook structure at the tip of the arm, and the concave shape opens to the end face and has a shape and a depth into which the connecting arm can be inserted, and the hook structure is hooked inside the connecting arm. It is a connecting hole provided with a hooking structure, and while sandwiching the lens on the inner peripheral side of the two frame components, the both end faces of the frame components facing each other are abutted against each other, and the connecting arm is attached to the connecting arm. A claim characterized in that the connection work of two frame components is completed in a state where the facing end faces are in close contact with each other by inserting the lens structure into the connecting hole and hooking the hook structure to the hook structure. Item 2. The lens holding frame according to Item 1, 2, 3, 4, 5, 6 or 7. The lens holding frame according to claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein the two frame components have the same shape and the same size. The lens holding frame according to claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, wherein the frame component is integrally injection-molded with a hard synthetic resin. The method for manufacturing a lens holding frame according to claim 4, wherein the frame component whose spring portion projects vertically from the bottom surface is injection-molded, and then an external force is applied to the spring portion of the frame component. A method for manufacturing a lens holding frame, which comprises tilting the lens toward the bottom surface so as to project diagonally upward from the bottom surface.

Images