JP7118633B2 - OPTICAL COMPONENT MANUFACTURING METHOD, OPTICAL COMPONENT, AND OPTICAL DEVICE - Google Patents

Description

The present invention relates to an optical component manufacturing method, an optical component , and an optical instrument.

Conventionally, optical products (optical parts) used in optical equipment such as cameras, for example, large telephoto lenses with long focal lengths, have been required to reduce the weight of the lens barrel due to its portability and mobility during shooting. There is a strong demand for miniaturization or miniaturization. For this reason, efforts are being made to make the parts that make up the lens barrel that holds the lens resin or to make them thinner.

2. Description of the Related Art Conventionally, in order to reduce the size and weight of parts constituting various industrial products, there has been known a method of changing all or part of the parts, which have been made of metal until then, to resin with a lower specific gravity. Also, in that case, at the same time, consideration may be taken to reduce the dimensions, especially the thickness, of the metal portion and the resin portion. For example, Patent Literature 1 below discloses a resin gear in which a metal bush is inserted, which can reduce the weight and noise while maintaining the strength of the gear.

In the case of an optical lens barrel or the like, as shown in Patent Document 2 below, the outer cylinder is made of metal such as aluminum by pressing, the inner cylinder is made of a resin material, and the sealing material between them is the outer cylinder. A watertight structure has been proposed for a waterproof lens barrel that is fixed with an inner barrel using adhesive or screws. Further, Patent Document 3 below discloses a structure in which a metal member and a resin member are integrated by integral molding processing in consideration of the rigidity, strength, and weight reduction of the lens barrel. In addition, in Patent Document 3, the mechanical portion for moving the lens barrel is made of resin.

JP 2007-056923 A JP-A-11-202397 Japanese Patent Application Laid-Open No. 2003-167180

Here, a telephoto lens equipped with a long focal length and large diameter lens having a focal length exceeding 500 mm to 1000 mm, for example, may have a configuration in which the total weight reaches Kg order. Such optical products exist, for example, as interchangeable lenses for mirror-type or mirrorless single-lens reflex cameras. Such an optical product is preferably made as lightweight as possible to facilitate portability and handling by reducing its weight. However, in optical products such as this type of interchangeable lens, the optical elements and mechanical parts themselves are large and have a large weight. It may be difficult to simply replace metal with resin.

In general, in lens barrels, a structure is used in which a V-shaped groove called a light shielding line is formed on the inner surface of the housing part where ghosts and flares are generated due to stray light. In some cases, it is difficult to reduce the thickness of the resin part. In optical products such as lens barrels, strict light shielding is required between the housing and the internal space near the optical axis in order to prevent ambient light from entering the lens. Therefore, the housing component of the lens barrel must have the necessary light shielding properties. For this reason, in order to reduce the weight, it is practically impossible to adopt a structure that includes an opening that communicates the inside and the outside, such as hollowing out, in the optical parts that make up the lens barrel.

In view of the above problems, an object of the present invention is to provide a compact and lightweight optical component or optical component that can ensure the necessary strength and wear resistance and also has necessary optical properties such as light blocking properties and anti-reflection properties for unnecessary light. An object of the present invention is to provide an optical product having the same optical component.

According to one aspect of the present invention, an optical characteristic portion made of a resin material having a light-shielding property is insert-molded into a cylindrical skeleton structure portion including a grating made of a metal material. A method of manufacturing an optical component, wherein the gratings are regularly arranged quadrilaterals or triangles, wherein the lattice structure and the optical features are combined such that the gratings are embedded in the optical features. an optical component having a plurality of shaped openings, wherein the resin material is in contact with a surface of a portion of the grating located between the plurality of openings, which constitutes the cylindrical inner surface of the framework structure . manufacturing method.
Further, one aspect of the present invention includes a cylindrical skeleton structure portion including a grid made of a metal material, and an optical characteristic portion made of a resin material and having a light shielding property , and the grids are arranged regularly. a plurality of quadrangular or triangular openings formed in parallel with each other, and the resin material constitutes the cylindrical inner surface of the skeleton structure at portions of the lattice located between the plurality of openings. is an optical component in contact with

With the above configuration, according to the present invention, a compact and lightweight optical component or optical component capable of securing the necessary strength and abrasion resistance and having necessary optical properties such as light shielding properties and anti-reflection properties of unnecessary light can be provided. An optical product with components can be provided.

2 is an external perspective view of a housing component of the lens barrel according to Embodiment 1 of the present invention; FIG. 1 is an explanatory diagram showing the configuration of a camera according to Embodiment 1 of the present invention; FIG. 1A is an external perspective view showing the structure of a housing component of a lens barrel according to Embodiment 1 of the present invention, particularly a focus unit, and FIG. 1B is a cross-sectional view showing the structure of a focus unit including a focus lens. FIG. 4 is an exploded perspective view showing the structure of the focus unit of FIG. 3(B); FIG. FIG. 2 is an external perspective view showing housing components of the lens barrel according to Embodiment 1 of the present invention, particularly metal parts of the guide barrel. FIG. 4 is an explanatory diagram showing a manufacturing method using a 3D printer for housing components of the lens barrel, particularly the metal portion of the guide barrel, according to Embodiment 1 of the present invention. 1 shows a manufacturing method using casting of housing parts of a lens barrel according to Embodiment 1 of the present invention, particularly a metal part of a guide barrel, (A) is a perspective view of the casting, and (B) is a post-treatment after casting. It is a sectional view showing. 1 shows a cross-sectional structure of a housing component of a lens barrel, particularly a guide barrel, according to Embodiment 1 of the present invention, where (A) is a cross-sectional view of the entire structure, and (B) is a cross-sectional view showing an enlarged part thereof; . FIG. 10 is an external perspective view showing housing components of a lens barrel, particularly a guide barrel, according to Embodiment 2 (or 3) of the present invention. FIG. 11 is an external perspective view showing a housing component of a lens barrel according to Embodiment 2 (or 3) of the present invention, particularly a frame portion of a guide barrel; FIG. 10 is an external perspective view showing a housing component of the lens barrel according to Embodiment 2 (or 3) of the present invention, particularly a rectilinear cam plate as a contact portion of the guide barrel. FIG. 11 is an external perspective view showing a housing component of a lens barrel according to Embodiment 4 of the present invention, particularly a frame portion of a separate structure from a base portion of a guide barrel. FIG. 13 is an external perspective view showing a base portion used together with the skeleton portion of FIG. 12; FIG. 13 is an external perspective view showing a ring portion used together with the skeleton portion of FIG. 12; FIG. 11 is an external perspective view showing a housing component of a lens barrel used, for example, in Embodiment 4 of the present invention, particularly a frame portion of a guide barrel molded by press working. FIG. 16 is an external perspective view showing a connecting structure of both end portions for processing the frame portion into a cylindrical shape from the state of FIG. 15; FIG. 12 is an explanatory diagram showing the configuration of a camera according to Embodiment 5 of the present invention; FIG. 10 is an external perspective view of a mirror holder used in the camera of FIG. 9; FIG. 19 is an external perspective view of a metal portion forming the frame of the mirror holder of FIG. 18; FIG. 2 is a table showing the material, specific gravity, volume, and weight of optical components manufactured according to Embodiment 1 of the present invention; FIG. 4 is a table showing the material, specific gravity, volume, and weight of optical components manufactured according to Embodiment 2 of the present invention; FIG. 10 is a table showing the material, specific gravity, volume, and weight of an optical component manufactured according to Embodiment 3 of the present invention; FIG. 10 is a table showing the material, specific gravity, volume and weight of an optical component manufactured according to Embodiment 4 of the present invention; FIG. 5 is a table showing the material, specific gravity, volume and weight of an optical component manufactured according to Embodiment 5 of the present invention; 6 shows a cross-sectional structure of housing parts of a lens barrel, particularly a guide barrel, according to Embodiment 6 of the present invention, where (A) is a cross-sectional view of the whole, (B) is a partially enlarged view of (A), (C ) is an enlarged view of (B), and (D) is a view of (C) viewed from the right side of the figure.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings. The configuration shown below is merely an example, and, for example, details of the configuration can be changed as appropriate by those skilled in the art without departing from the spirit of the present invention. Further, the numerical values taken up in the present embodiment are reference numerical values and do not limit the present invention.

In the following embodiments, an optical component including a skeleton structure portion and an optical characteristic portion which is bonded to the skeleton structure portion and is made of a resin material and has predetermined optical characteristics, and a manufacturing method thereof will be exemplified. The skeletal structure portion is made of a material (a metal material in the present embodiment) different from the resin material used in the optical characteristic portion, which has higher rigidity and wear resistance than the resin material used in the optical characteristic portion. As an example of this optical component, a lens barrel component (embodiments 1 to 4, 6) and a mirror holder as an optical element holder (embodiment 5) are shown below.

The skeletal structure of the optical component is formed by 3D printing or casting (eg die casting) or even cutting after casting. The skeletal structure primarily maintains the stiffness or strength of the optical component in question. Also, a part of this skeletal structure part can be configured as a part used as a contact part or a coupling part with respect to other parts.

On the other hand, the optical characteristic portion is formed by insert molding a resin material into the skeleton structure portion. The optical characteristic portion made of this resin material constitutes part of the function of maintaining the rigidity or strength of the optical component, but mainly functions as a portion for imparting optical characteristics such as light shielding properties and antireflection properties. Among these, the light shielding property is mainly imparted to the optical characteristic portion by using an opaque resin such as black. The antireflection property is imparted by forming a matte surface or a light-shielding line (light-shielding groove) at a required portion by simultaneous processing during insert molding or post-processing.

In addition, the framework structure is provided with a plurality of regularly arranged openings by the above-described 3D printing or casting (or subsequent processing). By performing insert molding so that the resin material of the optical characteristic portion enters the opening, the framework structure portion and the optical characteristic portion are firmly coupled through the opening.

<Embodiment 1>
In Embodiment 1, a lens barrel component (lens barrel housing component) is shown as the above optical component. In the lens barrel part of the present embodiment, in order to reduce the weight while maintaining the strength, the frame structure part is made of a high-strength material such as metal, leaving a region that requires rigidity, including the screw fastening part. In addition, sliding parts and connecting parts with other parts that require wear resistance are also preferably made integrally from the same metal or other highly wear-resistant material as the framework structure. In the first step of the optical component manufacturing method of the present embodiment, for example, this skeleton structure can be formed by 3D printing or casting (or subsequent processing).

On the other hand, the optical characteristic part of the lens barrel part is responsible for light shielding and antireflection properties, and for the purpose of weight reduction, it is made of a black or other resin material that does not transmit light and has a lower specific gravity than the skeleton structure part. In the second step of the optical component manufacturing method of the present embodiment, the optical characteristic portion is an insert in which the skeleton structure portion is placed inside a mold, and the resin material is injected or cast into the mold. It is formed by molding.

Specifically, the lens barrel component of this embodiment is an inner cylinder of a focus unit that movably supports an optical element, particularly a focusing lens, in the lens barrel. , the skeleton structure part is insert-molded so as to be embedded inside the optical characteristic part of the resin. In addition, in the lens barrel part of the present embodiment, in order to prevent the occurrence of ghosts and flares due to the reflection of light on the inner surface, the inner surface of the resin optical characteristic portion is preferably molded at the same time and subjected to matte treatment. It is matted to provide an anti-reflection surface. This matte shape can be produced in a mold and transferred at a low cost. The antireflection surface may be formed by post-processing after insert molding, or a post-processing step such as painting may be performed for the purpose of enhancing the matting effect. In the lens barrel component of the present embodiment, an antireflection pattern in which V-shaped grooves are periodically formed on the circumference, that is, a so-called light shielding line can be used as the antireflection surface. This light-shielding line can also be formed by simultaneous molding by insert molding or by subsequent processing. However, it is thought that the thickness of the resin can be made thinner by the matte treatment than by the light shielding line, and the thickness of the lens barrel parts can be made thinner, which may lead to further weight reduction.

FIG. 2 shows the configuration of a single-lens reflex digital camera as an optical device that can use the lens barrel component of this embodiment. In FIG. 2, a camera body 2 is connected to a photographing lens 1 . Light from an object is photographed through an optical lens such as lens 3 included in photographing lens 1 . Before photographing, the light is reflected by the main mirror 7, and after passing through the prism 11, the photographed image is displayed to the photographer through the finder lens 12. - 特許庁The main mirror 7 is a half mirror, and light transmitted through the main mirror is reflected by a sub-mirror 8 toward an AF (autofocus) unit 13. For example, this reflected light is used for distance measurement.

At the time of photographing, the main mirror 7 and the sub-mirror 8 are moved out of the optical path via a drive mechanism (not shown), the shutter 9 is opened, and the photographing light image incident from the photographing lens 1 is formed on the image sensor 10 . Further, the diaphragm 6 is configured to change the brightness and the depth of focus at the time of photographing by changing the aperture area. Note that even when the imaging element 10 of the single-lens reflex camera shown in FIG. 2 is replaced with a silver-salt film, the lens barrel component of the present embodiment can be configured in the same manner as described later. The taking lens 1 may be fixedly attached to the camera body 2, but in many optical devices of this type, the taking lens 1 is an interchangeable lens that can be attached to and detached from the body of the camera body 2. configured as

The photographing lens 1 is configured such that the focus state can be adjusted by variably moving the position of the focus lens 5 inside the focus unit 4 in the optical axis direction. Note that the lens barrel component of the present embodiment constitutes the focus unit 4 that adjusts the focal length, but a similar lens barrel component configuration can also be applied to a zoom unit that variably adjusts the magnification. Examples of the configuration of the focus unit 4 of this embodiment are shown in FIGS. 3A, 3B, and 4. FIG.

As shown in FIGS. 3 and 4, the focus unit 4 of this embodiment includes a cam barrel 14 as an outer cylinder and a guide barrel 15 as an inner cylinder corresponding to the lens barrel component of this embodiment. The cam cylinder 14 and the guide cylinder 15 have an inclined cam and a rectilinear cam, and are constructed so that the focus lens 5 can be moved forward or backward along the optical axis in the unit. The cam cylinder 14 is coupled with a focus ring (not shown) of the photographing lens 1 that can be rotated by the photographer. As a result, the photographer can adjust the focus by operating the focus ring while observing the in-focus state through the viewfinder lens 12 (FIG. 2), for example.

The cam cylinder 14 is formed with oblique cams 17 at intervals of 120°. Linear cams 18 are also formed on the guide cylinder 15 at intervals of 120°. The focus lens 5 is held by a focus lens holder 16 . Bearings 19 are attached to the focus lens holder 16 at intervals of 120°.

The bearing 19 is engaged with the oblique cam 17 and the rectilinear cam 18 and fixed in position. The inner surface of the cam cylinder 14 is engaged with the sliding surfaces 24, 25 (FIG. 5) of the guide cylinder 15. As shown in FIG. A bearing 22 is screwed into the screw fastening hole 23 of the guide cylinder 15 , and the bearing 22 is also engaged with the cam cylinder 14 .

The charge cylinder 20 pushes the cam cylinder 14 in the optical axis direction by the washer spring 21 in contact with the guide cylinder 15 . That is, the bearing 22 and the charge cylinder 20 urge the cam cylinder 14 obliquely to the lower right in FIG. 3 to maintain the position of the focus lens 5 in the optical axis direction. The guide tube 15 is screwed to a lens barrel component outside the unit that is not driven by a screw fastening portion 28, for example, an exterior portion.

On the other hand, the cam cylinder 14 is engaged with a focus ring as a focus key component that is rotationally driven about the optical axis through key grooves 26 and 27 and is rotated. By rotating the cam cylinder 14, the bearing 19 engaged with the rectilinear cam 18 moves in the optical axis direction along the oblique cam 17, thereby moving the focus lens 5 in the optical axis direction. adjustments are made.

The guide tube 15, which corresponds to the lens barrel part of the present embodiment, has an optical characteristic portion 51 having the above-described light shielding and antireflection properties with respect to the cylindrical metal frame structure portion 31, which is insert-molded from a resin material. Produced by

Here, the guide barrel 15 corresponding to the lens barrel component of this embodiment will be described in detail. The guide tube 15 is manufactured by inserting an optical characteristic portion 51 made of a resin material into the skeleton structure portion 31 shown in FIGS. 5 and 6, and is in the state shown in FIG.

As shown in FIGS. 5 and 6, the frame structure portion 31 has a frame structure of a lattice 151 for maintaining the rigidity and strength of the guide tube 15 on the cylindrical surface. A plurality of gratings 151 are arranged on the cylindrical surface formed by the framework structure 31 so as to be inclined with respect to a straight line parallel to the axis 1510 (generally coaxial with the optical axis O of the focus lens 5). It includes a diagonally slanted grid 1512 . More specifically, the grating 1512 includes a grating 1512a inclined toward one direction in the circumferential direction of the guide tube 15 with respect to a straight line parallel to the axis, and a grating 1512a inclined with respect to a straight line parallel to the axis. and the lattice 1512b slanted toward the other circumferential direction side are arranged so as to intersect with each other to form a lattice shape. In this embodiment, the grating 151 further includes a grating 1511 extending parallel to the axis of the cylindrical surface of the skeleton structure 31 (usually coaxial with the optical axis of the focus lens 5). With such a structure of the grating 151, the guide cylinder 15 can be compressed in the radial direction or in a direction parallel to the axis (generally coaxial with the optical axis of the focus lens 5), or through the cam groove of the rectilinear cam 18. Rigidity can be imparted with respect to the applied torsional external force. Also, as shown in FIG. 6 , a large number of rectangular openings 1513 are arranged at both ends of the guide tube 15 so as to match the direction of the inclined lattice 1512 .

The regions defined by the grids 1511, 1512 become triangular or quadrilateral openings 1514, 1514, . . . regularly defined and arranged by these grids. These regularly arranged openings 1514, 1514, .

Furthermore, the skeletal structure portion 31 includes the following parts. These correspond to the rectilinear cam 18 engaged with the bearing 19 and the sliding surfaces 24 and 25 engaged with the cam cylinder 14 . In addition, the frame structure 31 includes a screw fastening hole 23 to which the bearing 22 is screwed, seating surfaces 35 and 36, a seating surface and clearance of the screw fastening portion 28 with the lens barrel part outside the unit, and contact with the washer spring 21. It includes a contact surface 32, a sliding surface 33 that engages with the charge cylinder 20, and the like.

The skeletal structure 31 having a shape as complicated as that shown in FIG. 6 can be preferably manufactured using a 3D printer 201, for example. When the skeletal structure portion 31 is modeled by the 3D printer 201, for example, in FIG. The stacking direction L coincides with a direction parallel to the axis of the skeleton structure 31 (generally coaxial with the optical axis of the focus lens 5). At the time of modeling, the 3D printer 201 is supplied with 3D print data 202 for modeling the skeletal structure portion 31 . The 3D print data 202 is, for example, 3D CAD data of the skeletal structure 31. In this case, the 3D printer 201 decomposes the 3D CAD data into layer (slice) data for layered modeling in the layering direction L. used. Such layer (slice) data may be directly supplied to the 3D printer 201 as 3D print data 202 . Note that when the 3D print data 202 is supplied to the 3D printer 201 from a server or host device (not shown), the 3D print data 202 may be transmitted through network communication. Alternatively, the 3D print data 202 can be stored in a computer-readable recording medium such as various optical discs or flash memory devices and supplied to the 3D printer 201 . In that case, these computer-readable recording media constitute recording media of the present invention.

In the example of FIG. 6, the angle formed by the lamination direction L, that is, the direction parallel to the axis of the skeleton structure 31 (generally coaxial with the optical axis of the focus lens 5) and the inclined grating 1512 is the inclination angle of the grating 1512. (α) is taken at approximately 45°. As a result, good rigidity can be maintained against any external force in each of the above directions. The inclination angle (α) of this inclined grating 1512 is preferably about 50° or less. As the inclination angle (α) of the lattice 1512 exceeds about 50° and approaches the lying posture in the horizontal direction in FIG. 6, stable 3D modeling may become more difficult. On the other hand, by setting the inclination angle (α) of the grating 1512 to about 50° or less, particularly about 45° as shown in FIG.

The skeletal structure 31 may be formed by a 3D printer, as well as by casting as shown in FIGS. 7A and 7B, or by post-processing. In that case, as shown in FIG. 7(A), a cast metal component 37 having a molten metal flow allowance 38 in the inner diameter portion is produced. In the state immediately after casting, as indicated by hatching in FIG. 7(B), there is a molten metal flow allowance 38, so that the portion of the opening formed by the lattice 151 having the same shape as described above penetrates to the inner surface. do not have. After this casting, as shown in the cross section of FIG. 7(B), the molten metal flow allowance 38 is removed by cutting or the like along the removal line 39, and the opening of the lattice 151 is penetrated to obtain the skeleton structure 31. .

FIG. 1 shows a guide cylinder 15 produced by insert-molding an optical characteristic part 51 made of resin into the skeleton structure part 31 produced as described above.

The outer surface portion of the guide tube 15 has the same diameter as the outer diameter of the skeleton portion of the skeleton structure portion 31 in order to simplify the shape of the mold and reduce the volume and weight of the resin portion. In particular, after the insert molding, the guide cylinder 15 has such a structure that the skeleton structure portion 31 is exposed on the outer peripheral surface of the optical characteristic portion 51 made of resin. For example, the mold for insert molding is designed such that the resin material of the optical characteristic portion 51 enters the opening of the grating 151 of the skeleton structure portion 31 to a depth that is flush with the outer circumference of the skeleton structure portion 31 and fits therein. configuration. In addition, the following parts of the skeleton structure part 31, especially the parts that contact or slide with other members, have a metal part of the skeleton structure part 31 on the outer surface of the guide cylinder 15 in order to ensure the contact and sliding functions. The structure is exposed. At the abutment and sliding portions of the skeleton structure 31 exposed on the outer surface of these guide cylinders 15, there are a rectilinear cam 18 that engages with a bearing 19, sliding surfaces 24 and 25 that engage with the cam cylinder 14, and a bearing 22. A screw fastening hole 23 and bearing surfaces 35 and 36 to be screwed are included. Further, the abutting and sliding portions of the frame structure portion 31 exposed on the outer surface of the guide tube 15 include the bearing surface of the screw fastening portion 28 with the lens barrel part outside the unit, relief, and abutment with the washer spring 21. Surface 32 includes a sliding surface 24 that engages charge barrel 20 .

On the other hand, on the cylindrical inner surface (29) of the guide tube 15, the optical characteristic portion 51 is insert-molded so that the metal skeleton structure portion 31 is not exposed in order to ensure light blocking. Further, in order to prevent unwanted light from being reflected and the occurrence of ghosts and flares, the inner surface of the guide cylinder 15 is preferably provided with an antireflection surface 29 by matting. This anti-reflection surface 29 can be formed by forming a mold for insert molding of the optical characteristic portion 51 in advance and transferring it. Alternatively, the antireflection surface 29 may be formed by suitable post-processing or painting as described above.

A portion of the inner surface of the guide tube 15, particularly a portion where the optical characteristic portion 51 made of resin is required, has a circumferential V-shaped groove for antireflection as shown in FIG. 8(A). It is possible to form a so-called shielding line 30 portion formed in a plurality of lines in the direction of the core 1510 . Here, in the guide cylinder 15 of the present embodiment, as shown in the cross section of FIG. Become. In the case of the anti-reflection surface (29) by the above-described matte treatment, the thickness of the guide cylinder 15 increases by the amount of the molten metal flow allowance B. Since the thickness of the line is added, it is considered that the matte treatment is preferable in order to reduce the thickness and weight.

In the optical component and the lens barrel component of the first embodiment, the metal skeleton structure 31 is made of an aluminum alloy having a specific gravity of 2.68, and the resin optical characteristic part 51 is made of an aluminum alloy having a specific gravity of 2.68, for example, as shown in FIG. of 1.2 PC (polycarbonate). In this case, as shown in the figure, the volume of the skeleton structure portion 31 (metal portion) of Embodiment 1 is 7.2 cm̂3 (̂ indicates a power), the weight is 19.3 g, and the optical characteristic portion 51 (resin Part) has a volume of 14.6 cm^3 and a weight of 15.8 g. Therefore, in this example, the total weight of the metal portion and the resin portion is 35.1 g. On the other hand, in the comparative example (1203), the shape of the same volume corresponding to the skeleton structure portion 31 (metal portion) and the optical characteristic portion 51 (resin portion) on the left side of the figure (the present embodiment 1) is manufactured only from an aluminum alloy. This is an example of a case where The total weight of this comparative example (1203) is 58.4 g, and according to the structure of the first embodiment, the total weight can be reduced by about 40%.

In the production of the guide cylinder 15, a part whose accuracy cannot be guaranteed by a 3D printer, casting, or insert molding is subjected to secondary machining (post-machining) after insert molding to achieve the required accuracy. can also take In that case, it is desirable to add extra thickness to the part to be subjected to secondary processing (post-processing) during 3D printing, casting, or insert molding.

Further, in the above description, the structure in which the metal frame structure portion 31 is exposed from the resin optical characteristic portion 51 on the outer periphery of the guide tube 15 is illustrated. However, there is a possibility that the portion of the skeleton structure portion 31 exposed from the optical characteristic portion 51 reflects light and causes a ghost or flare. In that case, the exposed portion of the skeleton structure portion 31 may be colored by painting or alumite treatment as necessary to impart antireflection properties to the exposed portion of the skeleton structure portion 31 .

Further, in the above description, the skeleton structure portion 31 is defined by a linear lattice structure and has openings as lightening portions that are regularly arranged. However, as the shape of the openings as lightening portions regularly arranged to achieve the necessary weight reduction, a shape obtained by phase optimization analysis or the like may be adopted. Altair's OptiStruct (trade name) and the like are known for this type of phase optimization software, and by using this type of phase optimization software, it is possible to distinguish between necessary and unnecessary regions in terms of strength. can be done.

In the above description, the structure of the guide tube 15 of the inner tube of the focus unit 4 is exemplified as a lens barrel component, but the structure of the guide tube 15 may be applied to the cam tube 14, which is the outer periphery of the focus unit 4, for example. . The structure of the focus unit 4 exemplified above also applies to the zoom unit for operating the zoom optical system, and the structure of the lens barrel parts of the present embodiment is applied to the lens barrel parts constituting the zoom unit. may

As described above, according to the present embodiment, it is possible to ensure the strength and abrasion resistance that satisfy the required specifications of the lens barrel parts, and also to have the necessary optical characteristics such as light shielding properties and anti-reflection properties of unnecessary light. A compact and lightweight lens barrel component can be realized. In addition, by using the lens barrel component of the present embodiment, for example, a compact and lightweight lens unit having optical characteristics satisfying the required specifications, and an optical device including the lens unit, such as a digital or film camera, can be realized. .

In the following, as embodiments 2 to 4, of the skeleton structure portion 31 of the lens barrel component, for example, abutment (contact) for sliding and engaging with other members that require relatively strength and rigidity A structure in which the abutting portion and the other frame portion are separated from each other is exemplified. In Embodiments 2 to 4 below, the configuration of the skeleton structure portion 31 that can be implemented in the same lens barrel as the basic structure shown in FIGS. As for the illustrated members, structures equivalent to those of the first embodiment described above are used. In Embodiments 2 to 4 below, the same reference numerals are used for the same or corresponding members or portions as those described above, and detailed description thereof will be omitted unless particularly necessary.

<Embodiment 2>
9 shows the guide tube 15 having the skeleton structure 31, which corresponds to the lens barrel component of the second embodiment, and FIG. 10 shows the skeleton 182 of the skeleton structure 31 of FIG. FIG. 11 also shows a rectilinear cam plate 181 as an abutting portion that constitutes the frame structure portion 31 of FIG. 9 and is formed as a separate component from the frame portion 182 of FIG. 10 .

By making the skeleton structure portion 31 a separate structure in this way, the rectilinear cam plate 181 as an abutment portion with respect to another member provided with the rectilinear cam 18 and the skeleton portion 182 other than the rectilinear cam plate 181 are provided with, for example, different first and second cam plates. 2 metal materials can be used. As a result, different characteristics (physical properties) can be imparted to the abutting portion (straight cam plate 181), which requires strength, rigidity, wear resistance, etc., of each portion of the skeleton structure portion 31 and the skeleton portion 182 other than the contact portion. can. That is, for example, the abutting portion (straight cam plate 181) of the frame structure portion 31 can ensure sufficient strength, rigidity, wear resistance, and other characteristics, and the frame portion 182 can achieve necessary weight reduction. .

In the second embodiment, the two rectilinear cams 18, which engage with or abut on the bearing 19 (FIG. 4) and constitute a part of the focus mechanism, are provided on a rectilinear cam plate 181 as shown in FIG. It is

On the other hand, as shown in FIG. 10, a skeleton portion 182, which constitutes the skeleton structure portion 31 (FIG. 9) together with the rectilinear cam plate 181, has a skeleton structure formed of a lattice 151 formed on a cylindrical surface, similar to the skeleton structure portion 31 shown in FIG. It is a cylindrical member provided for the The skeleton portion 182 can be formed by the method of 3D printing as described in FIG. 6, or the method of casting and subsequent cutting of the inner surface as described in FIG. Further, as shown in the figure, the frame portion 182 is provided with cam plate housing portions 181a, 181a, 181a having, for example, notch structures for housing the rectilinear cam plate 181 at three locations. 5, the skeleton portion 182 has sliding surfaces 24 and 25 that engage with the cam cylinder 14, screw fastening holes 23 to which the bearings 22 are screwed, and seating surfaces 35 and 36. is included. Further, the abutting and sliding portions of the frame structure portion 31 exposed on the outer surface of the guide tube 15 include the bearing surface of the screw fastening portion 28 with the lens barrel part outside the unit, relief, and abutment with the washer spring 21. Surface 32 includes sliding surfaces 33 , 24 that engage charge barrel 20 .

As described above, the rectilinear cam plate 181 (FIG. 11) and the skeleton portion 182 (FIG. 10) of the second embodiment are separate members, and are joined by the optical characteristic portion 51 by insert molding as shown in FIG. be. In this insert molding, the rectilinear cam plate 181 (FIG. 11) and the frame portion 182 (FIG. 10) are set at predetermined positions in a mold (not shown) for insert molding via appropriate positioning means (not shown). After that, the resin material is cast into the mold. By this insert molding, the rectilinear cam plate 181 (FIG. 11) and the skeleton portion 182 (FIG. 10) are fixed at predetermined positions within the optical characteristic portion 51. As shown in FIG.

As shown in FIG. 11, the linear cam plate 181 has projections 181c and ridges 181d for positioning in the mold or mutual positioning with the cam plate accommodating portion 181a of the frame portion 182. Such a positioning portion can be provided. In addition, the rectilinear cam plate 181 may be provided with several openings 181b for weight reduction. The rectilinear cam plate 181 can be manufactured by any method, and the rectilinear cam plate 181 can be manufactured by, for example, press working or 3D printing.

An antireflection surface 29 can be formed on the inner surface of the optical characteristic portion 51 . Also, the antireflection surface 29 may be composed of a light shielding line 30 . The anti-reflection surface 29 may be formed by matting or coating, in addition to forming the light shielding lines 30 by mold processing. The guide barrel 15 configured as shown in FIG. 9 as described above has an optical component such as a long focal length and a It can be placed in the barrel of a large interchangeable lens (or fixed lens).

First and second different metal materials can be used for the rectilinear cam plate 181 as a contact portion with respect to other members and the frame portion 182 other than that. FIG. 21 shows, in the same format as FIG. 20 of Embodiment 1, the guide cylinder 15 manufactured according to Embodiment 2 and the material, specific gravity, volume, weight, etc. of each part in a comparative example.

In the example of FIG. 21, an aluminum alloy having a specific gravity of 2.68 is used as the first metal material for the rectilinear cam plate 181 of the frame structure 31 so as to ensure sufficient strength, rigidity, wear resistance, and other characteristics. ing. In addition, the frame portion 182 other than that is made of a magnesium alloy having a specific gravity of 1.8 mainly in consideration of weight reduction. Also, the optical characteristic portion 51 made of resin can be formed of PC (polycarbonate) having a specific gravity of 1.20. On the other hand, the comparative example (1203) in FIG. 21 is an example in which a shape equivalent to and of the same volume as the framework structure 31 on the left side is produced only from an aluminum alloy, and is the same as that in FIG.

As shown in FIG. 21, the structure of the second embodiment has a total weight of 29.7 g compared to the structure of the comparative example (1203) having a total weight of 58.4 g. , and the total weight has been reduced by about 49%. This weight reduction effect is even greater than the approximately 40% weight reduction effect in FIG. In this way, by adopting a lightweight magnesium alloy for the frame portion 182, which occupies a larger portion of the frame structure portion 31, excluding the rectilinear cam plate 181 made of aluminum alloy, a remarkable weight reduction effect can be expected. can.

<Embodiment 3>
Embodiment 3 shows one example of a different configuration of the skeleton structure portion 31 configured by the separate parts of Embodiment 2 described above. In the following description, portions not shown, such as the skeleton structure portion 31 to the guide barrel 15 and the overall structure of the lens barrel parts including these, are the same as those described above.

In the structure of the third embodiment, the frame structure portion 31 is a separate structure composed of the rectilinear cam plate 181 (FIG. 11), the frame portion 182 (FIG. 12), and the base portion 183 (FIG. 13). .

As shown in FIG. 13, the base portion 183 of the third embodiment is obtained by separating the base portion of the skeleton portion 182 (FIG. 10) of the second embodiment, for example. Therefore, the base portion 183 includes a seating surface of the screw fastening portion 28 with the lens barrel component outside the unit, a contact surface 32 with the washer spring 21, and the like. The base portion 183 is roughly composed of a short cylindrical portion and a flange-shaped portion, and an opening or the like for lightening can be arranged in the short cylindrical portion or the like. A rectilinear cam plate 181 (FIG. 11) has a configuration similar to that of the second embodiment described above.

Due to the separation as described above, the frame structure portion 31 consists of a rectilinear cam plate 181 (FIG. 11) and a frame portion 182 (FIG. 12), which have relatively simple structures, and a base portion 183 (FIG. 12), which has a relatively complicated structure. 13). Such separate construction may make these parts easier to manufacture, and may reduce overall manufacturing costs and time, for example. For example, according to the configuration of the third embodiment, the base portion 183 having a relatively complicated structure is divided into small shapes as shown in FIG. With the small size and shape of FIG. 13, this part may be easier and less expensive to manufacture, even when using certain manufacturing techniques, such as 3D printing.

Further, since the base portion 183 having a relatively complicated structure is separated as shown in FIG. 13, the shape of the skeleton portion 182 is organized into a relatively simple shape as shown in FIG. Therefore, the skeleton portion 182a shown in FIG. 12 can be manufactured very simply and inexpensively at low cost, for example, by a method described later with reference to FIGS. there is a possibility.

During insert molding, the rectilinear cam plate 181 (FIG. 11), skeleton portion 182 (FIG. 12) and base portion 183 (FIG. 13) are appropriately positioned in the mold, and the resin material constituting the optical characteristic portion 51 is cast. As a result, for example, a guide tube 15 having the same overall shape as that shown in FIG. 9 can be manufactured.

Here, FIG. 22 shows the material, specific gravity, volume, weight, etc. of each part in the guide tube 15 manufactured according to Embodiment 3 and the comparative example in the same format as FIGS. 20 and 21 . 22, the frame structure portion 31 of the guide cylinder 15 has a separate structure composed of a separate rectilinear cam plate 181 (FIG. 11), a frame portion 182 (FIG. 12), and a base portion 183 (FIG. 13). 51 is insert-molded.

As shown in FIG. 22, in this example, an aluminum alloy having a specific gravity of 2.68 is used as the first metal material for the rectilinear cam plate 181 in the same manner as described above. On the other hand, for the frame portion 182 and the base portion 183, a lithium magnesium alloy (specific gravity 1.36), which is lighter than the magnesium alloy, is used as the second metal material. The configuration of the comparative example (1203) is the same as that of FIGS. 20 and 21. FIG.

As shown in FIG. 22, the structure of the third embodiment has a total weight of 28.56 g compared to the structure of the comparative example (1203) having a total weight of 58.42 g. We have achieved a weight reduction of about 51% in total weight. The effect of this weight reduction is even greater than the structure using a magnesium alloy (specific gravity: 1.8) for the entire frame portion 182 of FIG. 21 (Embodiment 2). As in the third embodiment, except for the aluminum alloy rectilinear cam plate 181, the frame portion 182 and the base portion 183, which occupy a larger portion of the frame structure portion 31, are made of a lighter lithium-magnesium alloy. A significant weight reduction effect can be expected. Even in that case, by organizing the skeleton portion 182 and the base portion 183 into separate structures, there is a possibility that these parts can be easily manufactured, and the skeleton structure portion 31 or the guide barrel 15, and by extension the entire lens barrel can be lowered. Can be manufactured at a cost.

<Embodiment 4>
The skeleton portion 182 (FIG. 12) of Embodiment 3 has ring-shaped sliding surfaces 24 and 25 on its outer periphery. These portions constitute contact portions that slide with other members, that is, contact with other members. Therefore, this portion is made of an aluminum alloy (the above first metal) in consideration of wear resistance and strength, and the other portion of the frame portion 182 (FIG. 12) is made of a lightweight lithium-magnesium alloy (or magnesium alloy). It may consist of

FIG. 14 shows a ring portion 64 made of an aluminum alloy (first metal). The ring portion 64 has the same shape and size as the ring-shaped sliding surface 24 on the side opposite to the end portion where the base portion of the skeleton portion 182 of FIG. 12 is arranged, for example. 14 is placed in the same position as the sliding surface 24 in FIG. to mold. Thus, the ring portion 64 can constitute a portion equivalent to the sliding surface 24 described above. Alternatively, the ring portion 64 may similarly be used to form the sliding surface 25 (in which case the skeleton portion 182 would not have an integral sliding surface 25).

Here, FIG. 23 shows the material, specific gravity, volume, weight, etc. of each part in the guide cylinder 15 manufactured according to the fourth embodiment and the comparative example in the same manner as in FIGS. 23 is a separate straight cam plate 181 (FIG. 11), a skeleton portion 182 (FIG. 12), a base portion 183 (FIG. 13), and a ring portion 64. The structure is insert-molded in the optical characteristic portion 51 .

As shown in FIG. 23, in this example, an aluminum alloy having a specific gravity of 2.68 is used as the first metal material for the rectilinear cam plate 181 and the ring portion 64, which form contact portions with other members. On the other hand, for the frame portion 182 and the base portion 183, a lithium magnesium alloy (specific gravity 1.36), which is lighter than the magnesium alloy, is used as the second metal material. However, in the figure, the volume of the frame portion 182 is reduced by an amount corresponding to the sliding surface 24, and the volume of the aluminum alloy of the ring portion 64, which is a separate part, is increased. The configuration of the comparative example (1203) is the same as that of FIGS. 20 and 21. FIG.

As shown in FIG. 23, the structure of the fourth embodiment has a total weight of 29.02 g compared to the structure of the comparative example (1203) having a total weight of 58.42 g. We have achieved a weight reduction of about 50% in total weight. This weight reduction effect is about 1% smaller than that in the case of FIG. 22 because the volume of the aluminum alloy of the ring portion 64, which is a separate part, is increased. However, even so, it is possible to obtain a greater effect of weight reduction than the structure using a magnesium alloy (specific gravity of 1.8) for the entire frame portion 182 of FIG. 21 (Embodiment 2). The effect of ease of manufacture is substantially the same as that of the third embodiment.

Further, in the fourth embodiment, not only the rectilinear cam plate 181 but also the ring portion 64 functioning as the sliding surface 24 are made of an aluminum alloy, so that the portion constituting the contact portion with these other members is Sufficient strength, rigidity or abrasion resistance can be imparted.

The skeleton portion 182 (FIG. 12) in Embodiments 3 and 4 described above can be processed into a cylindrical shape as shown in FIG. 12 by the method shown in FIGS. FIG. 15 shows a frame formed by press working (or die-casting) or the like to form openings and the like forming the lattice 151 and the cam plate accommodating portion 181a in a flat plate-shaped metal material, such as a lithium magnesium alloy, of a predetermined thickness. Member material 1821 is shown. In addition to the openings described above, the frame material 1821 is provided at both ends 1821a and 1821b with recesses 1823 and projections 1822 for positioning these ends when processed into a cylindrical shape.

This skeleton part material 1821 is rolled into a cylindrical shape of the skeleton part 182 as shown in FIG. stick it. Thereby, the skeleton portion 182 having the cylindrical shape shown in FIG. 12 can be obtained. 15 and 16, there is a possibility that the skeleton portion 182 (FIG. 12) in Embodiments 3 and 4 can be easily manufactured at relatively low cost.

In the above-described second to fourth embodiments, the structure is shown in which the frame structure portion is a contact portion with respect to other parts, and the frame portion of the frame structure portion excluding the contact portion is a separate structure. However, in order to implement the present invention, it is sufficient that the contact portion includes a portion made of the first metal material, and the skeleton portion of the skeleton structure portion excluding the contact portion includes a portion made of the second metal material. . That is, in the above embodiment, the abutment portion and the skeleton portion of the separate skeleton structure portion are not necessarily made of one type of metal material. Parts of different materials may be included. For example, the first metal material forming the contact surface of the contact portion with respect to other parts is made of a thin film of a metal material having high wear resistance, and the other parts are different from the first metal material. It may be composed of other materials. The same is true for the skeleton part. For example, a metal material considering strength and rigidity is used as the second metal material for the parts that require strength and rigidity, and the other parts are made of other materials different from the second metal material. may be composed of

<Embodiment 5>
This embodiment shows a mirror holder as an optical element holder (Embodiment 5) as an example of an optical component employing the present invention.

FIG. 17 shows the configuration of a single-lens reflex digital camera as an optical device that can use the mirror holder of this embodiment. A camera body 2 is connected to a photographing lens 1. - 特許庁Light from an object is photographed through an optical lens such as lens 3 included in photographing lens 1 . Before photographing, the light is reflected by the main mirror 7, and after passing through the prism 11, the photographed image is displayed to the photographer through the finder lens 12. - 特許庁

Also in this embodiment, the main mirror 7 is a half mirror, and the light transmitted through the main mirror is reflected by the sub-mirror 8 toward the AF (autofocus) unit 13. For example, this reflected light is used for distance measurement. . During photographing, the main mirror 7 and the sub-mirror 8 are moved out of the optical path via a driving mechanism (not shown), the shutter 9 is opened, and the photographing light image incident from the photographing lens 1 is formed on the image sensor 10 . Further, the diaphragm 6 is configured to change the brightness and the depth of focus at the time of photographing by changing the aperture area.

It should be noted that there is a possibility that the imaging element 10 of the single-lens reflex camera shown in FIG. 17 is replaced with a silver salt film. In that case, the mirror holder of this embodiment can have a configuration similar to that described later. The taking lens 1 may be fixedly attached to the camera body 2, but in many optical devices of this type, the taking lens 1 is an interchangeable lens that can be attached to and detached from the body of the camera body 2. is the same as in Embodiments 1 to 4 above.

The main mirror 7 is attached to and supported by a main mirror holder 40 by adhesion or the like. The swing position of the main mirror 7 and the main mirror holder 40 in FIG. 17 is an observation position for reflecting the observation light in the direction of the finder lens 12 different from that at the time of photographing. At the time of photographing, the main mirror 7 and the main mirror holder 40 are swung to the horizontal position in the figure as indicated by arrows through a drive mechanism (not shown) in synchronization with the opening of the shutter 9 . At this time, the sub-mirror 8 is synchronously folded with the main mirror holder 40 so as to be substantially flush with the main mirror holder 40 .

The purpose of swinging the main mirror holder 40 is to move the main mirror 7 out of the photographing optical path, and to prevent ghosts caused by light entering from the outside through the finder lens 12. The object is to shield the optical path between the lens 12 and the lens 12. - 特許庁After photographing, that is, after necessary exposure of the image pickup device 10, the shutter 9 is closed. In synchronism with this, the mechanism quickly returns to the position shown in FIG. ing. For this reason, the main mirror 7 that swings via the main mirror holder 40 is sometimes called a quick return mirror or the like.

The unit of the main mirror holder 40 including the main mirror 7 and the sub-mirror 8 is desired to be light in weight in order to improve the (quick return) drive characteristics such as the swing speed and stop time. On the other hand, in the conventional configuration, the main mirror holder 40 has a large thickness, for example, from the viewpoints of strength against impact during driving, reliable holding of the main mirror 7, and blocking of unnecessary light before and after photographing. It may be difficult to reduce the weight by punching or the like.

FIG. 18 shows the main mirror holder 40 of the fifth embodiment. FIG. 18 is a perspective view from the rear left side of the lower surface of the main mirror holder 40, and particularly shows the main mirror holder 40 with the sub-mirror 8 removed. A composite structure of a skeleton structure portion 161 for maintaining strength and rigidity, and an optical characteristic portion 52 formed by insert-molding a resin material such as black into the skeleton structure portion 161 and having a light shielding property or an antireflection property. It has become. That is, the main mirror 7 or further the sub-mirror 8 is supported by the optical element holder of this embodiment, that is, the structure formed by combining the main mirror holder 40 skeleton structure portion 161 and the optical characteristic portion 52 . The solid shape of the main mirror holder 40 illustrated in a flat plate shape in FIG. 18 is constituted by an optical characteristic portion 52 made of resin, except for portions not specifically described below.

In FIG. 18, the main mirror holder 40 has a rotating shaft 41 around which the above swinging drive is performed. At the roots of the rotating shafts 41, 41, there is provided a receiving surface 42 that abuts and slides on a bearing (not shown) on the camera body 2 side to restrict movement in the horizontal direction of the drawing. The rotating shaft 41 and the receiving surface 42, which constitute contact or sliding portions for these other parts, are molded integrally with the skeleton structure portion 161 and are exposed from the optical characteristic portion 52 made of resin.

As described above, the main mirror holder 40 maintains the inclined posture shown in FIG. 17 and inserted into the main optical path of the camera, except when the shutter is driven. At this time, a positioning member (not shown) of the camera body 2 at the rear end of the main mirror holder 40 abuts. The receiving surface 43, which constitutes a contact or sliding portion with respect to other parts, is molded integrally with the skeleton structure portion 161 and is exposed from the optical characteristic portion 52 made of resin.

Like the main mirror 7, the sub-mirror 8 also needs to be retracted from the main optical path so as to take a horizontal posture in FIG. For this reason, the main mirror holder 40 is provided with rotating shafts 44, 44 for swinging the sub-mirror 8 so that it is parallel to the main mirror. ), receiving surfaces 45, 45 that contact and slide are arranged. The receiving surface 45, which constitutes a contact or sliding portion with respect to other parts, is molded integrally with the skeleton structure portion 161 and is exposed from the optical characteristic portion 52 made of resin.

Further, it is necessary to prevent ghosts and flares caused by reflection of light on the back side when the main mirror holder 40 moves out of the optical path. For this reason, an antireflection surface composed of a light shielding line 46 is formed on a necessary portion of the rear surface of the main mirror holder 40 . In FIG. 18, the antireflection surface formed by the light shielding line 46 can be formed by simultaneous molding when the optical characteristic portion 52 is insert-molded. Further, the portion of the antireflection surface formed by the light shielding lines 46 may be formed by post-processing such as delustering by matting or painting. The receiving surfaces 43, 43, which face the main optical axis when moving to the horizontal position in FIG.

Also in the main mirror holder 40 as an optical component of the fifth embodiment, the framework structure 161 for maintaining strength and rigidity is made of metal as in the first (to fourth) embodiments. However, as shown in FIG. 18, most of the portion of the skeleton structure portion 161 other than the portion constituting the contact and sliding portion is embedded and covered inside the surface of the resin of the optical characteristic portion 52, and the appearance The structure is such that the top cannot be seen. In FIG. 18, the portions of the skeleton structure 161 other than the portions constituting the abutting and sliding portions are exposed substantially only at the edge of the main mirror holder 40, and the other portions are embedded in the optical characteristic portion 52. ing.

FIG. 19 shows a configuration example of the skeleton structure portion 161 of the main mirror holder 40 before the resin of the optical characteristic portion 52 is inserted. The skeleton structure 161 in FIG. 19 is shown from the rear left side of the lower surface, like the main mirror holder 40 in FIG.

The skeletal structure 161 of the main mirror holder 40 of this embodiment has a lattice shape as in the first to fourth embodiments. A three-dimensional lattice structure such as This type of three-dimensional lattice structure is sometimes called a "lattice structure". This three-dimensional lattice structure has a shape in which a large number of spaced inclined lattices 1611, 1611 . . . are arranged at suitable intervals and combined. Also, the portions (41, 42, 43, 44, 45, etc.) forming the contact and sliding portions of the skeleton structure portion 161 are shaped in the same shape as in FIG. A central portion of the skeleton structure portion 161 is an opening 81 that allows passage of light traveling in the direction of the sub-mirror 8 via the main mirror 7 of the half mirror.

The skeletal structure portion 161 of FIG. 19 is hollowed out by openings defined by the inclined lattices 1611 with a regular arrangement in its three-dimensional lattice structure. Therefore, it is possible to greatly reduce the weight of the skeleton structure portion 161 . A three-dimensional lattice structure or lattice structure having a shape as shown in FIG. 19 is particularly suitable for modeling with a 3D printer 201 or the like.

That is, the skeletal structure portion 161 of FIG. 19 can be modeled by supplying the 3D print data 202 for modeling the skeletal structure portion 161 to the 3D printer 201 in the same manner as described above. In that case, for example, the lamination direction L in which lamination molding is repeated is taken in the thickness direction of the skeleton structure portion 161 . In this case, for the same reason as the grid 1512 described above, the tilted grid 1611 or 1613 of the skeletal structure 161 is tilted with respect to a straight line (normal line) perpendicular to the plane in which one 3D modeled layer is included. It is preferable that the shape be such that the inclination angle is 50° or less. For example, the receiving surface 43 is conceivable as a plane including one layer of 3D modeled layer that serves as a reference for this tilt angle. Here, the plane including one 3D modeled layer is one surface of the structure (for example, the receiving surface 43 or the It is assumed that the light shielding line 46 and the like are substantially parallel to the back surface).

In addition, in the production of the main mirror holder 40, the part where the precision cannot be guaranteed by a 3D printer or insert molding is subjected to secondary processing (post-processing) by machining after the insert molding, and a manufacturing method is adopted to achieve the necessary precision. can also be taken. In that case, it is desirable to add extra thickness to the part to be subjected to secondary processing (post-processing) during 3D printer and insert molding.

In the above description, the metallic skeleton structure 161 is exposed from the resin optical characteristic portion 52 on the side surface of the main mirror holder 40 . However, there is a possibility that the portion of the skeleton structure portion 161 exposed from the optical characteristic portion 52 reflects light and causes a ghost or flare. In this case, the exposed portion of the skeleton structure portion 161 may be colored by painting or alumite treatment as necessary to impart antireflection properties to the exposed portion of the skeleton structure portion 161 .

It should be noted that in the frame structure portion 161 of the main mirror holder 40 of the present embodiment as well, the shape of openings (lightening portions) regularly arranged in the frame structure portion 161 is determined by phase optimization analysis or the like as in the above-described embodiment. may be determined using

In the optical component and main mirror holder 40 of the fifth embodiment, the metal framework structure 161 can be made of a magnesium alloy having a specific gravity of 1.81, for example, as shown in FIG. The optical characteristic portion 52 made of resin is formed by foam-molding ABS (acrylonitrile-butadiene-styrene) having a specific gravity of 1.20 at a foaming ratio of 10%, and the specific gravity after insert molding is 1.08. As shown in FIG. 24, in this example, the skeleton structure portion 161 (metal portion) has a volume of 0.34 cm^3 and a weight of 0.62 g, and the optical characteristic portion 52 (resin portion) has a volume of 0.55 cm^. 3, the weight is 0.59 g, and the total weight of the metal part and the resin part is 1.21 g.

On the other hand, in the comparative example (1204), the shape of the same volume corresponding to the skeleton structure part 161 (metal part) and the optical characteristic part 52 (resin part) on the left side of the figure (this embodiment 5) was produced only with a magnesium alloy. This is an example of a case where The total weight of the comparative example (1204) is 1.60 g, and according to the structure of the fifth embodiment, the total weight can be reduced by about 25%.

As described above, according to this embodiment, the strength and abrasion resistance that satisfy the required specifications can be secured, and a compact and lightweight optical system that has necessary optical properties such as light shielding properties and anti-reflection properties for unnecessary light can be provided. An element holder, in particular a primary mirror holder, can be realized. Also, by using the optical element holder of the present embodiment, it is possible to realize optical equipment such as a high-performance digital or film camera.

In addition, in the mirror holder as in Embodiment 5 as well, the frame structure portion shown in Embodiments 2 to 4 is a contact portion with respect to other parts, and the skeleton portion of the frame structure portion excluding the contact portion is provided. can be made of separate or different first and second metal materials. For example, in the skeleton structure 161 of the main mirror holder 40, the abutting portions, that is, the portions that slide or abut on other parts such as the rotating shafts 41, 44 and the receiving surfaces 42, 43, 45 is composed of a first metallic material. Other portions different from these are made of a second metal material. In that case, for example, an aluminum alloy is used as the first metal material, and a magnesium alloy or a lithium-magnesium alloy is used as the second metal material, as described above. By selecting such a structure and metal materials, it is possible to provide a main mirror holder having good properties in which weight reduction and rigidity, strength or durability are well balanced.

<Embodiment 6>
In this embodiment, a plurality of minute anchor-shaped portions are provided on the surface that contacts the optical characteristic portion during insert molding of the skeleton structure portion, and the anchoring effect allows the skeleton structure portion and the optical characteristic portion to be joined more firmly. This embodiment is effective when a resin material having a large shrinkage rate is used, or when the thickness of the optical characteristic portion is reduced, and peeling of the optical characteristic portion after insert molding is concerned.

FIG. 25 shows a cross-sectional structure of a housing component of a lens barrel in which an anchor-shaped portion 63 is formed according to Embodiment 6 of the present invention, particularly a skeleton structure portion 31, and (A) is a cross-section of a guide tube 15 as a housing component. (B) is a partially enlarged cross-sectional view, (C) is a further partially enlarged cross-sectional view, and (D) is a view of (C) viewed from the right side of the figure.

As shown in FIG. 25, a plurality of minute anchor-shaped portions 63 are formed on the surface 31a of the skeletal structure portion 31 in contact with the optical characteristic portion 51. As shown in FIG. The minute anchor-shaped portion 63 is a minute recess formed on the surface 31a of the skeleton structure portion 31, and in FIG. is smaller than the width Y of the That is, the anchor-shaped portion 63 is formed so that its internal space S is larger than the inlet portion 63a. The portion 51 is firmly joined, and cracking and peeling of the optical characteristic portion 51 can be prevented.

A 3D printer is preferably used to manufacture the skeletal structure portion 31 having the minute anchor shape portions 63 . When repeating modeling and lamination along the lamination direction L, it is desirable that the size of the width X of the entrance portion 63a of the minute anchor shape portion 63 is set to be at least twice the lamination thickness of the 3D printer used. . In this embodiment, it is set in the range of 0.02 mm or more and 0.3 mm or less. This is because if it is too small, the hole may be blocked, and if it is too large, the wall thickness will be thick, and there is a possibility that sink marks or voids will occur in the optical characteristic portion.

In addition, 0.02 mm or more, which is the minimum thickness for resin to flow, is generally secured. With respect to dimension Y, it is larger than inlet dimension X and constitutes an anchor profile. For example, when the lamination thickness is 0.02 mm, the dimension X is 0.04 mm and the dimension Y is 0.08 mm.

Since the minute anchor-shaped portion is filled with powder immediately after molding, the powder is removed after the molding is completed or after the secondary processing. Any method may be used as long as the powder in the anchor-shaped portion can be removed, such as suction using a vacuum cleaner, blowing off using an air gun, ultrasonic cleaning, or the like.

As described above, according to the present embodiment, it is possible to join the skeleton structure portion and the optical characteristic portion more firmly, the degree of freedom in setting the resin material and wall thickness is improved, and the weight is reduced. Component configuration can be realized.

Note that the fine anchor-shaped configuration described above is merely an example, and the configuration is not limited to the configuration described above as long as the skeletal structure portion and the optical characteristic portion are firmly connected by the anchor effect.

DESCRIPTION OF SYMBOLS 1... Taking lens, 2... Camera body, 3... Lens, 4... Focus unit, 5... Focus lens, 6... Diaphragm, 7... Main mirror, 8... Sub-mirror, 9... Shutter, 10... Image sensor, 11... Prism, 12... Finder lens, 13... AF unit, 14... Cam cylinder, 15... Guide tube, 16... Focus lens holder, 17... Oblique cam, 18... Straight cam, 19... Bearing, 20... Charge tube, 21... Washer spring, 22... Bearing 23... Screw fastening hole 24, 25... Sliding surface 26, 27... Keyway 28... Screw fastening part 29... Antireflection surface 30... Light shielding line forming surface 31, 161... Framework structure Part 32... Contact surface 35, 36... Screw bearing surface 37... Cast part 38... Melt flow allowance 39... Removal line 40... Main mirror holder 41, 44... Rotating shaft 42, 43, 45 .

Claims (21)

An optical characteristic portion made of a light-shielding resin material is insert-molded into a cylindrical skeleton structure portion including a lattice made of a metal material, so that the lattice of the skeleton structure portion is attached to the optical characteristic portion. A method for manufacturing an optical component , wherein the skeletal structure portion and the optical characteristic portion are bonded so as to be embedded ,
The lattice has a plurality of regularly arranged quadrilateral or triangular openings,
the resin material is in contact with a surface of a portion of the lattice located between the plurality of openings, which constitutes a cylindrical inner surface of the framework structure;
A method of manufacturing an optical component. 2. The method of manufacturing an optical component according to claim 1, wherein said plurality of openings are arranged in a direction along the cylindrical axis of said skeleton structure . 3. The method of manufacturing an optical component according to claim 1, wherein, after the insert molding, the portion of the grating located between the plurality of openings forms a cylindrical outer surface of the skeleton structure. A method for manufacturing an optical component having an exposed surface . 4. The method of manufacturing an optical component according to claim 1 , wherein an antireflection surface is formed in said optical characteristic portion by said insert molding or subsequent processing . 5. The method of manufacturing an optical component according to claim 1 , wherein said skeleton structure has a plurality of anchor shapes on a surface that couples with said optical characteristic portion. 6. The method of manufacturing an optical component according to any one of claims 1 to 5, wherein the skeletal structure is formed by a 3D printer. 6. The method of manufacturing an optical component according to any one of claims 1 to 5, wherein the skeletal structure portion is shaped by casting or post-processing after casting. a cylindrical skeletal structure including a grid formed from a metallic material ;
and an optical characteristic part made of a resin material and having a light blocking effect ,
The lattice has a plurality of regularly arranged quadrilateral or triangular openings,
An optical component in which the resin material is in contact with a surface forming a cylindrical inner surface of the skeleton structure in a portion of the grating located between the plurality of openings . 9. The optical component according to claim 8, wherein said resin material is in contact with the surfaces forming said openings of said portions of said grating located between said plurality of openings. 10. The optical component according to claim 8, wherein said lattice of said framework structure is embedded in said resin material. 11. The optical component according to any one of claims 8 to 10, wherein the portion of the grating located between the plurality of openings has an exposed surface forming the outer cylindrical surface of the skeletal structure. optical components. 12. The optical component according to any one of claims 8 to 11 , wherein said plurality of openings are arranged in a direction along the cylindrical axis of said skeleton structure . 13. The optical component according to any one of claims 8 to 12 , wherein said framework structure is made of at least one of a material containing aluminum and a material containing magnesium . 14. The optical component according to any one of claims 8 to 13 , wherein an antireflection surface is formed on said optical characteristic portion. 15. The optical component according to any one of claims 8 to 14 , wherein the plurality of openings includes a quadrilateral opening and a triangular opening adjacent to the quadrilateral opening. parts. 16. The optical component according to any one of claims 8 to 15 , wherein grooves larger than said plurality of openings are formed in said skeleton structure. 17. The optical component according to any one of claims 8 to 16 , wherein said skeleton structure has a plurality of anchor shapes on a surface that couples with said optical characteristic portion. An optical instrument comprising the optical component according to any one of claims 8 to 17 and an optical element . 19. The optical instrument according to claim 18, wherein said optical component is a barrel that supports said optical element. 20. The optical instrument according to claim 18, further comprising another member that slides on said skeleton structure. 21. The optical instrument according to claim 20, wherein said skeleton structure includes a portion made of a metal material different from said grating, and said another member slides on said portion.

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