Optical device, display device, imaging device, and method for manufacturing an optical device

Abstract

To provide a compact optical device with high optical performance. [Solution] The optical device (100) includes a lens (10) having a curved surface, an optical film (11) disposed on at least a portion of the effective area on the curved surface of the lens (10), and holding parts (12, 13) that hold the lens (10) and the optical film (11).

Description

Technical Field

[0001] The present invention relates to an optical device, a display device, an imaging device, and a method for manufacturing an optical device.

Background Art

[0002] In recent years, in display devices such as head-mounted displays (HMDs), an optical system that uses polarization to fold the optical path has been adopted for miniaturization. In such an optical system, an optical element in which an optical film is disposed on the curved surface of an optical element such as a lens is used. Patent Document 1 discloses that an adhesive or an adhesive material is used to closely adhere the optical film to the curved surface of the optical element.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An optical device that is small and has high optical performance is desired.

Means for Solving the Problems

[0005] An optical device according to one aspect of the present invention includes a lens having a curved surface, an optical film disposed on at least a part of an effective region on the curved surface of the lens, and a holding portion that holds the lens and the optical film.

Effects of the Invention

[0006] According to the present invention, it is possible to provide an optical device that is small and has high optical performance.

Brief Description of the Drawings

[0007] [Figure 1] These are cross-sectional views of the optical apparatus and schematic diagrams of the optical elements in each embodiment. [Figure 2] These are schematic diagrams of the display devices in each embodiment. [Figure 3] This is an explanatory diagram of the optical path in each embodiment. [Figure 4] This is an explanatory diagram of the optical apparatus in Example 1. [Figure 5] This is an explanatory diagram of the optical apparatus in Example 2. [Figure 6] This is a cross-sectional view of the optical device in Example 3. [Figure 7] This is a cross-sectional view of the optical device in Example 4. [Figure 8] This is a cross-sectional view of the optical device in Example 5. [Figure 9] This is a cross-sectional view of the optical device in Example 6. [Figure 10] This is a cross-sectional view of the optical device in Example 7. [Figure 11] This is a cross-sectional view of the optical device in Example 8. [Figure 12] This is a schematic diagram of an imaging device equipped with the optical device of each embodiment. [Modes for carrying out the invention]

[0008] The embodiments of the present invention will be described in detail below with reference to the drawings. Note that, for convenience, the drawings may be drawn to a different scale than the actual dimensions. Furthermore, the same reference numeral is used for identical components in each drawing, and redundant explanations are omitted.

[0009] First, the optical device 100 in each embodiment will be described with reference to Figures 1(a) and 1(b). Figure 1(a) is a cross-sectional view of the optical device 100. Figure 1(b) is a schematic diagram of the optical element (lens) 10 of the optical device 100. The optical device 100 comprises the optical element 10, an optical film (optical functional film) 11, a lens barrel 12, and a support member 13. The optical element 10 is made of a resin material such as COC, COP, acrylic, polycarbonate, polyester, or glass.

[0010] The surface of the optical element 10 that the optical film 11 is in close contact with is curved. Preferably, the absolute value of the maximum half-opening angle θ is greater than 0 degrees and less than 60 degrees. Here, the half-opening angle is the angle between the surface normal and the optical axis OA at any point on the optical element 10. If the surface of the optical element 10 is spherical, the maximum half-opening angle is the angle between the surface normal at the edge of the surface of the optical element 10 with respect to its maximum effective diameter (the maximum diameter through which effective rays contributing to image formation pass on the surface of the optical element 10) and the optical axis. If the surface of the optical element 10 is aspherical, the surface normal will differ depending on the position.

[0011] In each embodiment, at least one surface of the optical element 10 is curved in any cross-section including the optical axis. On the other hand, if the optical element includes a non-curved shape, the optical film 11 is adhered without being stretched, which suppresses peeling and lifting of the outer edge of the optical film 11, but it becomes a design limitation and reduces optical performance.

[0012] The optical film 11 is positioned in at least a portion of the effective region (optically effective region) on the curved surface of the optical element 10 (not limited to the entire effective region, but may be only a portion of the effective region). Here, the effective region is the region through which effective light rays that contribute to image formation pass on the optical surface, and is the range of the effective diameter shown by the dashed line in Figure 1(b). In each embodiment, the optical film 11 is not limited to being positioned in the entire effective region, but may be positioned in a portion of the effective region.

[0013] The optical film 11 has at least one function of a retardation plate, a polarization beam splitter element, a polarizing plate, an antireflection element, and a color selection element. The optical film 11 also contains a resin material and is different from an optical thin film. In an optical thin film, peeling or lifting from the outer edge does not occur, but the optical functions that can be formed are limited. Also, it is more advantageous to use the optical film 11 to obtain optical functions at a low cost. Although not shown in the figure, the optical film 11 is arranged (adhered) to the optical element 10 via an adhesive or an adhesive material. The adhesive is an optically transparent material made of a resin material such as acrylic, epoxy, or urethane. The adhesive material is an optically transparent adhesive material made of a resin material such as acrylic, silicone, rubber, or urethane. The adhesiveness in the present disclosure refers to the property of a material that exhibits adhesiveness by applying a slight pressure at room temperature for a short time. The optical film 11 has a thickness of about 10 to 500 μm and can be configured by laminating a plurality of layers, for example, but is not limited thereto.

[0014] The support member 13 fixes the optical element 10 and the optical film 11 to the lens barrel 12 by supporting at least a part of the outer edges of the optical element 10 and the optical film 11. The lens barrel 12 and the support member 13 constitute a holding part for holding the optical element 10. The support member 13 supports (holds or fixes) the optical element 10 and the optical film 11, for example, by caulking, a pressing ring, a lens barrel, the abutting surface of the lens barrel, an adhesive, a snap fit, or the abutment of the outer edge of an adjacent optical element. That is, the holding part has a pressing ring, a caulking structure, an adhesive, or a snap fit structure. Or the holding part is the abutting part of another optical element (another lens) adjacent to the optical element 10. Or the optical film 11 is held by the holding part on the reference plane of the optical element 10.

[0015] The conditional expressions that are preferably satisfied in the optical device 100 of each embodiment are described below. <00,00092> When the maximum diameter of the optical film 11 is df and the maximum diameter of the optical element 10 is ds, the optical device 100 of each embodiment preferably satisfies the following conditional expression (1).

[0017] 0.70 ≦ ds / df ≦ 1.20 ···(1) Conditional expression (1) relates to the maximum diameter of the optical film 11. By satisfying conditional expression (1), it becomes possible to achieve both miniaturization of the optical device 100 and suppression of deterioration of optical performance. If the upper limit value of conditional expression (1) is exceeded, the optical film 11 will be supported near the center of the optical element 10, so if an attempt is made to secure the necessary effective portion, the optical device 100 will become large. On the other hand, if the lower limit value of conditional expression (1) is exceeded, the amount by which the optical film 11 protrudes from the optical element 10 increases, and the extra optical film 11 affects the arrangement of the optical element 10, resulting in deterioration of optical performance.

[0018] Note that the maximum diameter ds of the optical element 10 and the maximum diameter df of the optical film 11 respectively mean the maximum diameter of the optical element 10 or the optical film 11 itself, not the maximum effective diameter. For example, even if a part of the optical element 10 or the optical film 11 is missing, the maximum diameters ds and df are respectively the maximum diameters in the non-missing regions.

[0019] More preferably, the numerical range of conditional expression (1) is set as in the following conditional expression (1a).

[0020] 0.75 ≦ ds / df ≦ 1.15 ···(1a) Even more preferably, the numerical range of conditional expression (1) is set as in the following conditional expression (1b).

[0021] 0.80 ≦ ds / df ≦ 1.10 ···(1b) In each embodiment, let the distance in the radial direction from an arbitrary outer end point P1 of the optical film 11 to the point P2 closest to the center (optical axis OA) of the optical element 10 in the region where the optical film 11 is supported by the holding portion be dr. At this time, the optical device 100 of each embodiment preferably satisfies the following conditional expression (2).

[0022] 0.0025 ≤ dr / df ≤ 0.2000 ···(2) Condition (2) relates to the support position of the optical film 11. Satisfying condition (2) makes it possible to achieve both miniaturization of the optical device 100 and suppression of optical performance degradation. If the upper limit of condition (2) is exceeded, the optical film 11 will be supported near the center of the optical element 10, and the optical device 100 will become larger in order to secure the necessary effective area. On the other hand, if the lower limit of condition (2) is fallen below, the area for supporting the optical film 11 cannot be sufficiently secured, and peeling or lifting of the optical film 11 cannot be suppressed, resulting in a decrease in optical performance.

[0023] More preferably, the numerical range of condition (2) is set as shown in condition (2a) below.

[0024] 0.0050≦dr / df≦0.1500 (2a) More preferably, the numerical range of condition (2) is set as shown in condition (2b) below.

[0025] 0.0100≦dr / df≦0.1000 (2b) In each embodiment, the holding portion supports the entire circumference of the optical film 11, or supports the optical film 11 in multiple regions (support region, divided region) that divide the entire circumference of the optical film 11. In the latter case, da is defined as the shortest distance between adjacent regions among the multiple regions supported by the holding portion (the distance between point P3 and point P4). In this case, it is preferable that the optical device 100 of each embodiment satisfies the following condition (3).

[0026] 0.00 <da / df≦0.90 ···(3) Condition (3) relates to the support position of the optical film 11. Satisfying condition (3) makes it possible to suppress the deterioration of the optical performance of the optical device 100. If the upper limit of condition (3) is exceeded, the unsupported area of ​​the optical film 11 increases, and peeling or lifting of the optical film 11 may occur within the effective area. In addition, if the support area of ​​the optical film 11 is small, the optical element 10 may be distorted, and the orientation of the optical element 10 may not be properly maintained, resulting in a deterioration of optical performance. Note that the support members become one unit at the lower limit of condition (3), which is 0, so it will not fall below the lower limit of condition (3).

[0027] More preferably, the numerical range of condition (3) is set as shown in condition (3a) below.

[0028] 0.00 <da / df≦0.85 ···(3a) More preferably, the numerical range of condition (3) is set as shown in condition (3b) below.

[0029] 0.00 <da / df≦0.80 ···(3b) When the maximum half-opening angle of the region supporting the optical film 11 is θ (degrees), it is preferable that the optical device 100 of each embodiment satisfies the following condition (4).

[0030] |θ|≦60 ···(4) Condition (4) relates to the shape of the support position of the optical film 11. Here, the maximum half-opening angle refers to the maximum value of the angle between the surface normal at any point in the region supporting the optical film 11 and the optical axis of the optical element 10. Satisfying condition (4) makes it possible to properly fix the optical element 10 to the lens barrel 12. If the upper limit of condition (4) is exceeded, the tilt of the support position of the optical film 11 becomes large, and the optical element cannot be properly fixed.

[0031] More preferably, the numerical range of condition expression (4) is set as shown in condition expression (4a) below.

[0032] |θ|≦45 ···(4a) More preferably, the numerical range of conditional expression (4) is set as shown in conditional expression (4b) below.

[0033] |θ|≦30 ···(4b) In each embodiment, the optical device 100 is manufactured by a first step of placing the optical film 11 on the curved surface of the optical element 10, and a second step of holding the optical element 10 and the optical film 11 with the lens barrel 12.

[0034] Next, specific application examples of the optical device 100 of each embodiment will be described. Specific application examples include eyepiece optical systems used in display devices such as head-mounted displays, and imaging optical systems for cameras and video cameras. These optical systems consist of multiple optical elements, and each embodiment can be applied to at least one of these multiple optical elements.

[0035] Referring to Figure 2, a display device using the optical device 100 of each embodiment will be described. Figure 2 is a schematic diagram of a head-mounted display 400, which is an example of a display device using the optical device 100 of each embodiment.

[0036] The head-mounted display 400 has right-eye and left-eye eyepiece optics corresponding to the user's right eye 411R and left eye 411L. The right-eye eyepiece optics are composed of optical element 404R and optical device 100R. The left-eye eyepiece optics are composed of optical element 404L and optical device 100L. The display elements (right-eye display element) 401R and (left-eye display element) 401L are organic EL displays. Polarizing plates 402R and 402L and phase plates 403R and 403L are arranged between the display elements 401R and 401L and the optical elements 404R and 404L, respectively, to convert unpolarized light emitted from the display elements 401R and 401L into circularly polarized light.

[0037] The right eyepiece optical system projects the original image displayed on the display element 401R as a virtual image, magnifying it and directing it to the user's right eye 411R. The left eyepiece optical system projects the original image displayed on the left eye display element 401L as a virtual image, magnifying it and directing it to the user's left eye 411L. Each eyepiece optical system is an optical system that folds the optical path using polarization, and half-mirrors are deposited on the first surface of the optical elements 404R and 404L.

[0038] Optical films 11R and 11L are in close contact with the display element side of the optical elements (lenses) 10R and 10L. The optical films 11R and 11L are each constructed by laminating an anti-reflective film, a phase plate, and a polarization separation film in order from the side closest to the display elements 401R and 401L. In the optical devices 100R and 100L, the lens barrels 12R and 12L support and fix at least a portion of the outer circumference of the optical elements 10R and 10L and the optical films 11R and 11L.

[0039] Next, the optical paths in each embodiment will be described with reference to Figure 3. Figure 3 is an explanatory diagram of the optical paths in each embodiment.

[0040] Light emitted from the display element 401 passes through the polarizing plate 402 to become linearly polarized, and then passes through the phase plate 403 to become circularly polarized. It passes through the half mirror and anti-reflective film 11a on the first surface of the optical element 404, suppressing reflected light that causes ghosting, and then passes through the phase plate 11b to become linearly polarized. The polarization direction of the linearly polarized light is perpendicular to the polarization direction transmitted by the polarization separation film 11c. Therefore, it is reflected by the polarization separation film 11c, passes through the phase plate 11b, and becomes circularly polarized. Also, after passing through the anti-reflective film 11a, it is reflected by the half mirror, passes through the anti-reflective film 11a again, and then passes through the phase plate 11b to become linearly polarized. Unlike the above, the polarization direction of this linearly polarized light coincides with the polarization direction transmitted by the polarization separation film 11c, so it passes through the polarization separation film 11c, passes through the optical element 10, and is finally guided to the user's eye 411.

[0041] By supporting the optical element 10 and the outer edge of the optical film 11 and fixing them to the lens barrel 12, it is possible to prevent peeling or lifting from the outer edge of the optical film 11 and suppress a decrease in optical performance.

[0042] In each embodiment, it is preferable that the value obtained by subtracting twice the distance dr from the maximum diameter df of the optical film 11 or the maximum diameter ds of the optical element 10 is greater than or equal to the effective diameter (effective region) shown by the dashed line in Figure 1(b). The following describes each embodiment in detail. [Examples]

[0043] First, the optical device 100 in Example 1 will be described with reference to Figures 4(a) and 4(b). Figures 4(a) and 4(b) are a cross-sectional view of the optical device 100 and a schematic diagram of the optical element 10 in this embodiment. As shown in Figure 4(a), the optical element 10 and the optical film 11 bonded to the optical element 10 via an adhesive are inserted into the inner diameter of the lens barrel 12 from the optical axis direction, and the optical element 10 abuts against the abutment portion of the lens barrel 12. A support member 13 is formed by heat-sealing a part of the lens barrel 12, and the optical element 10 and the optical film 11 are fixed to the lens barrel 12. At this time, the optical film 11 is a film made by laminating a polarizing separation film, a phase difference plate, and an anti-reflective film, and the maximum diameter ds of the optical element 10 is 40 mm, and the maximum diameter df of the optical film 11 is 40 mm.

[0044] As shown in Figure 4(b), the distance dr from any outer edge of the optical film 11 to the point closest to the center of the area where the optical film 11 is supported by heat crimping is 3 mm. The area supported by heat crimping is divided into three regions, and the distance da between adjacent areas supported by support members is 30.8 mm. In other words, in this embodiment, the support member 13 divides the entire circumference of the optical film 11 into multiple regions (support area, The optical film 11 is supported in the divided region. The support area and the effective area are represented by the same geometric formula and have a continuous shape. The maximum half-opening angle of the support area is 20 degrees. In this embodiment, the support area and the effective area are represented by the same geometric formula, but they can be represented by different formulas as long as they have a continuous shape.

[0045] Table 1 shows the characteristics of this embodiment.

[0046] [Table 1]

[0047] The optical device 100 can be judged to be in good condition because no peeling or lifting was observed to enter the effective part, and this does not affect the optical performance. [Examples]

[0048] Next, the optical device 100 in Example 2 will be described with reference to Figures 5(a) and (b). Figures 5(a) and (b) are a cross-sectional view of the optical device 100 and a schematic diagram of the optical element 10 in this embodiment. As shown in Figure 5(a), the optical element 10 and the optical film 11 bonded to the optical element 10 via adhesive are inserted into the inner diameter of the lens barrel 12 from the optical axis direction, and the optical element 10 abuts against the abutment portion of the lens barrel 12. A support member 13 is formed by heat-sealing a part of the lens barrel 12, and the optical element 10 and the optical film 11 are fixed to the lens barrel 12. The optical film 11 is a polarization separation film, and the maximum diameter ds of the optical element is 40 mm, and the maximum diameter df of the optical film is 40 mm.

[0049] As shown in Figure 4(b), the optical element 10 has an outer shape in which a part of a circle is flattened. The distance dr from any outer edge of the optical film 11 to the point closest to the center of the area where the optical film 11 is supported by heat crimping is 3 mm, and the entire circumference of the optical film 11 is supported by heat crimping. In this embodiment, the outer shape of the optical element 10 has one flattened part of a circle, but it may also have an outer shape in which multiple flattened parts of a circle are located, or an elliptical shape.

[0050] The support area and the effective area are represented by the same geometric formula and have a continuous shape. Furthermore, the maximum half-opening angle of the support area is 20 degrees.

[0051] Table 2 shows the characteristics of this embodiment.

[0052] [Table 2]

[0053] The optical device 100 is judged to be in good condition because no peeling or lifting was observed to enter the effective part, and this did not affect the optical performance. [Examples]

[0054] Next, with reference to Figure 6, the optical device 100 in Embodiment 3 will be described. Figure 6 is a cross-sectional view of the optical device 100 in this embodiment. As shown in Figure 6, the optical element 10 and the optical film 11, which is bonded to the optical element 10 via an adhesive, are inserted into the inner diameter portion of the lens barrel 12 from the optical axis direction, and the optical element 10 abuts against the abutment portion of the lens barrel 12. The optical element 10 and the optical film 11 are fixed to the lens barrel 12 via a buffer member 14. That is, in this embodiment, the holding portion includes the lens barrel 12 and the buffer member 14 positioned between the optical film 11 and the lens barrel 12.

[0055] In this embodiment, the support member 13 is composed of a retaining ring and supports the optical film 11 via a buffer member 14 to relieve pressure on the optical film 11. The optical film 11 is a polarizing separation film, with a maximum diameter ds of 40 mm for the optical element 10 and a maximum diameter df of 38.5 mm for the optical film 11. The distance dr from any outer end of the optical film 11 to the point closest to the center of the area supporting the optical film 11 is 1 mm, and the entire circumference of the optical film 11 is supported.

[0056] The support area and the effective area are represented by the same geometric formula and have a continuous shape. Furthermore, the maximum half-opening angle of the support area is 19 degrees.

[0057] [Table 3]

[0058] The optical device 100 is judged to be in good condition because no peeling or lifting was observed to enter the effective part, and this did not affect the optical performance. [Examples]

[0059] Next, with reference to Figure 7, the optical device 100 in Embodiment 4 will be described. Figure 7 is a cross-sectional view of the optical device 100 in this embodiment. As shown in Figure 7, the optical element 10 and the optical film 11, which is bonded to the optical element 10 via an adhesive, are inserted into the inner diameter of the lens barrel 12 from the direction of the optical axis, and the optical element 10 abuts against the abutment portion of the lens barrel 12. The optical element 10 and the optical film 11 are supported by a support member 13 and fixed to the lens barrel 12.

[0060] In this embodiment, the support member 13 is made of ultraviolet-curing resin, and can be fixed even if the end shape is complex. Furthermore, even if there is an area at the outer end of the optical film 11 that is not adhered to the optical element 10, it is possible to prevent peeling, lifting, and detachment of chips from the edge of the optical film 11 because it is covered with ultraviolet-curing resin.

[0061] The optical film 11 is a polarization-separating film. The maximum diameter ds of the optical element 10 is 40 mm, and the maximum diameter df of the optical film 11 is 42.1 mm. The distance dr from any outer edge of the optical film 11 to the point closest to the center of the region supporting the optical film 11 is 1.5 mm, and the entire circumference of the optical film 11 is supported.

[0062] The support area and the effective area are represented by the same geometric formula and have a continuous shape. Furthermore, the maximum half-opening angle of the support area is 18.5 degrees.

[0063] [Table 4]

[0064] The optical device 100 is judged to be in good condition because no peeling or lifting was observed to enter the effective part, and this did not affect the optical performance. [Examples]

[0065] Next, with reference to Figure 8, the optical device 100 in Embodiment 5 will be described. Figure 8 is a cross-sectional view of the optical device 100 in this embodiment. As shown in Figure 8, the optical element (lens) 110 and the optical film 111, which is bonded to the optical element 110 via an adhesive, are inserted into the inner diameter of the lens barrel 12 from the direction of the optical axis, and the optical element 110 abuts against the abutment portion of the lens barrel 12.

[0066] Next, the optical element (lens) 210, to which the support members 113, 213 and optical films 211, 311 are in close contact, is inserted and fixed to the lens barrel 12 by the support member 313. In this embodiment, the support members 113, 213 are lens barrels that also serve as retaining rings, and the support member 313 is a retaining ring, allowing for simultaneous support of the optical films 111, 211, and 311.

[0067] Optical film 111 is a laminated film of a phase plate and an anti-reflective film. Optical film 211 is a polarizing separation film. Optical film 311 is a laminated film of a polarizing film and an anti-reflective film. The maximum diameters ds1 and ds2 of optical elements 110 and 210 are both 40 mm. The maximum diameter df of optical films 111, 211 and 311 is also 40 mm. The distances dr1, dr2, and dr3 from any outer edge of optical films 111, 211 and 311 to the point closest to the center of the region supporting optical films 111, 211 and 311 are 2 mm, 2 mm, and 3 mm, respectively, and the entire circumference of the optical films is supported.

[0068] The support region and effective portion of the optical elements 110 and 210 are represented by the same geometric formula and have a continuous shape. Furthermore, the maximum half-opening angles θ1, θ2, and θ3 of the support region are 2.7 degrees, 7.3 degrees, and 1.5 degrees, respectively.

[0069] The characteristics of this embodiment are shown in Table 5 below.

[0070] [Table 5]

[0071] The optical device 100 is judged to be in good condition because no peeling or lifting was observed to enter the effective part, and this did not affect the optical performance. [Examples]

[0072] Next, with reference to Figure 9, the optical device 100 in Embodiment 6 will be described. Figure 9 is a cross-sectional view of the optical device 100 in this embodiment.

[0073] As shown in Figure 9, the optical element (lens) 15, the optical element 10, and the optical film 11 bonded to the optical element 10 via adhesive are inserted into the inner diameter of the lens barrel 12 from the optical axis direction, and the optical element 15 abuts against the abutment portion of the lens barrel 12. The optical element 10 and the optical film 11 are fixed to the lens barrel 12 using a retaining ring from the opposite side of the optical element 10 where the optical film 11 is in close contact, with a portion of the optical element 15 serving as the support member 13, which supports the outer end of the optical film 11. In this embodiment, by making the support member 13 a portion of the optical element 15, it is possible to reduce the number of parts.

[0074] The optical film 11 is a polarization-separating film. The maximum diameter ds of the optical element 10 is 40 mm, and the maximum diameter df of the optical film 11 is 40 mm. The distance dr from any outer edge of the optical film 11 to the point closest to the center of the region supporting the optical film 11 is 1.5 mm, and the entire circumference of the optical film 11 is supported.

[0075] The support area and the effective area are represented by the same geometric formula and have a continuous shape. Furthermore, the maximum half-opening angle of the support area is 0 degrees. The characteristics of this embodiment are shown in Table 6 below.

[0076] [Table 6]

[0077] The optical device 100 is judged to be in good condition because no peeling or lifting was observed to enter the effective part, and this did not affect the optical performance. [Examples]

[0078] Next, the optical device 100 in Example 7 will be described with reference to Figure 10. Figure 10 is a cross-sectional view of the optical device 100 in this example.

[0079] As shown in Figure 10, the optical element 10 and the optical film 11, which is bonded to the optical element 10 via an adhesive, are inserted into the inner diameter of the lens barrel 12 from the direction of the optical axis, and the outer shape of the optical element 10 abuts against the abutment portion of the lens barrel 12. In this way, the optical element 10 and the optical film 11 are fixed to the lens barrel 12 by the support member 13, which is part of the lens barrel 12.

[0080] In this embodiment, the support member 13 is a component in which the lens barrel 12 and the snap-fit ​​are integrally molded, and is supported by the lens barrel 12 via the buffer member 14. In this embodiment, the outer shape of the optical film side of the optical element 10 is used as the reference plane for positioning, so tolerances such as the thickness of the optical element 10 are not affected. As a result, the positioning accuracy of the optical film 11 is improved, and the deterioration of optical performance is suppressed.

[0081] The optical film 11 is a polarization-separating film, with a maximum diameter ds of 40.25 mm for the optical element 10 and a maximum diameter df of 40 mm for the optical film 11. The distance dr from any outer edge of the optical film 11 to the point closest to the center of the region supporting the optical film 11 is 0.5 mm, and the entire circumference of the optical film 11 is supported.

[0082] The support area and the effective area are represented by the same geometric formula and have a continuous shape. Furthermore, the maximum half-opening angle of the support area is 1.5 degrees.

[0083] [Table 7]

[0084] The optical device 100 is judged to be in good condition because no peeling or lifting was observed to enter the effective part, and this did not affect the optical performance. [Examples]

[0085] Next, the optical device 100 in Example 8 will be described with reference to Figure 11. Figure 11 is a cross-sectional view of the optical device 100 in this example.

[0086] As shown in Figure 11, the optical element 10 and the optical film 11, which is bonded to the optical element 10 via an adhesive, are inserted into the inner diameter of the lens barrel 12 from the direction of the optical axis, and the optical film 11 abuts against the abutment portion of the lens barrel 12. The abutment portion is used as a support member 13 and is fixed to the lens barrel 12 by a retaining ring from the surface of the optical element 10 opposite to the surface to which the optical film 11 is in close contact.

[0087] In this embodiment, by using the surface against which the optical film 11 abuts as a reference surface, the optical film 11 can be positioned without being affected by variations in the thickness of the optical film 11. In particular, when the optical film 11 is a polarization separation film, the sensitivity to positioning is high. Therefore, by positioning the optical film 11 in a way that is not affected by variations in its thickness, it is possible to suppress the deterioration of optical performance.

[0088] The optical film 11 is a polarization-separating film. The maximum diameter ds of the optical element 10 is 40 mm, and the maximum diameter df of the optical film 11 is 40 mm. The distance dr from any outer edge of the optical film 11 to the point closest to the center of the region supporting the optical film 11 is 2.5 mm, and the entire circumference of the optical film 11 is supported.

[0089] The support area and the effective area are represented by the same geometric formula and have a continuous shape. Furthermore, the maximum half-opening angle of the support area is 1.5 degrees.

[0090] [Table 8]

[0091] The optical device 100 is judged to be in good condition because no peeling or lifting was observed to enter the effective part, and this did not affect the optical performance. (Imaging device) Next, with reference to Figure 12, an imaging device 120 using the optical device 100 of each embodiment as the imaging optical system will be described. Figure 12 is a schematic diagram of the imaging device 120.

[0092] In Figure 12, 123 is the camera body, and 121 is the imaging optical system composed of one of the optical devices 100 described in Examples 1 to 8. 122 is an image sensor (photoelectric conversion element) such as a CCD sensor or CMOS sensor, which is built into the camera body 123 and receives the optical image formed by the imaging optical system 121 and converts it into photoelectric energy. The camera body 123 may be a so-called single-lens reflex camera with a quick-turn mirror, or a so-called mirrorless camera without a quick-turn mirror.

[0093] By applying the optical device 100 of each embodiment to the imaging device 120, an imaging device with high optical performance can be obtained. The optical device 100 of each embodiment can also be similarly applied to a video camera.

[0094] Each embodiment's disclosure includes the following configuration and method. (Composition 1) A lens having a curved surface, An optical film disposed in at least a portion of the effective area on the curved surface of the lens, An optical device having a holding part for holding the lens and the optical film. (Configuration 2) The optical apparatus according to configuration 1, characterized in that the optical film is in close contact with the curved surface. (Composition 3) The optical device according to configuration 1 or 2, characterized in that the optical film contains a resin. (Composition 4) The optical apparatus according to any one of configurations 1 to 3, characterized in that the optical film is arranged on the curved surface via an adhesive or tack. (Composition 5) When the maximum diameter of the optical film is df and the maximum diameter of the lens is ds, 0.70 ≤ ds / df ≤ 1.20 An optical device according to any one of configurations 1 to 4, characterized in that it satisfies the following conditional expression. (Composition 6) When dr is the distance from the outer edge of the optical film to the point in the region supported by the holding portion that is closest to the center of the lens, 0.0025 ≤ dr / df ≤ 0.2000 An optical device according to any one of configurations 1 to 5, characterized in that it satisfies the following conditional expression. (Composition 7) The optical apparatus according to any one of configurations 1 to 6, characterized in that the holding portion supports the entire circumference of the optical film. (Composition 8) The optical apparatus according to any one of configurations 1 to 6, characterized in that the holding portion supports the optical film in a plurality of regions that divide the entire circumference of the optical film. (Composition 9) When the shortest distance between adjacent regions among the plurality of regions supported by the holding portion is da, and the maximum diameter of the optical film is df, 0.00 <da / df≦0.90 The optical device according to configuration 8, characterized in that it satisfies the following conditional expression. (Composition 10) The optical apparatus according to any one of configurations 1 to 9, characterized in that the optical film has at least one function of a phase difference plate, a polarization separation element, a polarizing plate, an anti-reflective element, and a color selection element. (Composition 11) The optical apparatus according to any one of configurations 1 to 9, characterized in that the retaining portion is a pressing ring. (Composition 12) The optical apparatus according to any one of configurations 1 to 9, characterized in that the holding portion has a crimping structure. (Composition 13) The optical device according to any one of configurations 1 to 9, characterized in that the holding portion has an adhesive. (Composition 14) The optical device according to any one of configurations 1 to 9, characterized in that the retaining portion has a snap-fit ​​structure. (Composition 15) The optical apparatus according to any one of configurations 1 to 9, characterized in that the holding portion is a contact portion of another lens adjacent to the lens. (Composition 16) The optical apparatus according to any one of configurations 1 to 9, characterized in that the optical film is held by the holding portion on the reference surface of the lens. (Composition 17) When the maximum half-opening angle of the region supporting the optical film is θ (degrees), |θ|≦60 An optical device according to any one of configurations 1 to 16, characterized in that it satisfies the following conditional expression. (Composition 18) The optical device according to any one of configurations 1 to 17, characterized in that the holding portion is a lens barrel for holding the lens. (Composition 19) The optical apparatus according to any one of configurations 1 to 18, characterized in that the holding portion includes a lens barrel for holding the lens and a buffer member disposed between the optical film and the lens barrel. (Composition 20) A display device characterized by having an optical device according to any one of configurations 1 to 19 and a display element. (Composition 21) An imaging device characterized by having an optical device according to any one of configurations 1 to 19 and an image sensor. (Method 1) The first step is to place the optical film on the curved surface of the lens, The process includes a second step of holding the lens and the optical film with a holding part, A method for manufacturing an optical device, characterized in that, in the first step, the optical film is arranged in at least a portion of the effective area on the curved surface of the lens.

[0095] Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of its essence. [Explanation of Symbols]

[0096] 100, 100R, 100L optical equipment 10, 110, 210, 10R, 10L Optical elements (lenses) 11, 111, 211, 11R, 11L Optical Functional Film 12, 12R, 12L Telescope Tube (Holding Section) 13. Support member (holding part)

Claims

1. A lens having a curved surface, An optical film disposed in at least a portion of the effective area on the curved surface of the lens, An optical device having a holding part for holding the lens and the optical film.

2. The optical device according to claim 1, characterized in that the optical film is in close contact with the curved surface.

3. The optical device according to claim 1, characterized in that the optical film contains a resin.

4. The optical device according to claim 1, characterized in that the optical film is arranged on the curved surface via an adhesive or tack.

5. When the maximum diameter of the optical film is df and the maximum diameter of the lens is ds, 0.70 ≤ ds / df ≤ 1.20 The optical device according to claim 1, characterized in that it satisfies the following condition.

6. When dr is the distance from the outer edge of the optical film to the point in the region supported by the holding portion that is closest to the center of the lens, 0.0025 ≤ dr / df ≤ 0.2000 The optical device according to claim 1, characterized in that it satisfies the following condition.

7. The optical apparatus according to claim 1, characterized in that the holding portion supports the entire circumference of the optical film.

8. The optical apparatus according to claim 1, characterized in that the holding portion supports the optical film in a plurality of regions obtained by dividing the entire circumference of the optical film.

9. When the shortest distance between adjacent regions among the plurality of regions supported by the holding portion is da, and the maximum diameter of the optical film is df, 0.00<da / df≦0.90 The optical apparatus according to claim 8, characterized in that it satisfies the following conditional expression.

10. The optical device according to claim 1, characterized in that the optical film has at least one of the functions of a phase difference plate, a polarization separation element, a polarizing plate, an anti-reflective element, and a color selection element.

11. The optical device according to claim 1, characterized in that the retaining portion is a retaining ring.

12. The optical device according to claim 1, characterized in that the holding portion has a crimping structure.

13. The optical device according to claim 1, characterized in that the holding portion has an adhesive.

14. The optical device according to claim 1, characterized in that the retaining portion has a snap-fit ​​structure.

15. The optical apparatus according to claim 1, characterized in that the holding portion is a contact portion of another lens adjacent to the lens.

16. The optical apparatus according to claim 1, characterized in that the optical film is held by the holding portion on the reference surface of the lens.

17. When the maximum half-opening angle of the region supporting the optical film is θ (degrees), |θ| ≤ 60 The optical device according to claim 1, characterized in that it satisfies the following condition.

18. The optical device according to claim 1, characterized in that the holding portion is a lens barrel for holding the lens.

19. The optical apparatus according to claim 1, characterized in that the holding portion includes a lens barrel that holds the lens and a buffer member disposed between the optical film and the lens barrel.

20. A display device comprising an optical device according to any one of claims 1 to 19 and a display element.

21. An imaging device characterized by having an optical device according to any one of claims 1 to 19 and an image sensor.

22. The first step is to place the optical film on the curved surface of the lens, The process includes a second step of holding the lens and the optical film with a holding portion, A method for manufacturing an optical device, characterized in that, in the first step, the optical film is arranged in at least a portion of the effective area on the curved surface of the lens.

Images