JP2010038957A - Optical device and method for manufacturing the optical device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical device in which temperature rise due to irradiation heat is restrained, and a method for manufacturing the optical device. <P>SOLUTION: The optical device includes a cylindrical part 12 provided on the outside of a light passing area where light can pass, and at least partially equipped with a reflection surface 24 having ≥30% reflectance of light whose lightness L in an Lab color specification system is <40 and whose wavelength is 900 to <1,700 nm. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical device and a method for manufacturing the optical device.

  An optical device such as a lens barrel provided in a camera is used in an environment where a large amount of light including infrared rays such as sunlight is irradiated, such as when used for outdoor event photography. There is. In the optical device according to the prior art, when used in an environment where a large amount of sunlight is irradiated, there is a problem that the temperature of the optical device increases due to irradiation heat.

  As a conventional technique for preventing a temperature rise of a lens barrel or the like, for example, an optical device including a reversible temperature-sensitive color changing layer on the surface of a housing is known (see Patent Document 1). However, the optical device according to the related art cannot sufficiently suppress the temperature increase of the optical device due to the heat of irradiation, and cannot suppress the temperature increase particularly in the case of a dark-colored exterior.

Many optical devices such as lens barrels are designed so that a photographer or the like can operate by directly shaking the surface of the optical device. However, when the optical device according to the prior art is used in an environment irradiated with sunlight, the surface temperature rises due to the radiant heat, and the optical device may not be operated comfortably. It has become.
JP 2007-49370 A

  The present invention has been made in view of such a situation, and an object thereof is to provide an optical device having a suitable temperature characteristic and a method for manufacturing the optical device.

In order to achieve the above object, an optical device according to the present invention comprises:
A reflection surface (24, 64) provided outside the light passage region through which light can pass, the lightness L in the Lab color system being less than 40, and the reflectance of light having a wavelength of 900 nm or more and less than 1700 nm is 30% or more. 74, 74a) includes a cylindrical portion (12, 62, 72, 80) provided at least in part.

An optical device according to the second aspect of the present invention is
A reflection surface provided outside the light passage region through which light can pass and having a lightness L in the Lab color system of 40 or more and less than 70 and a reflectance of light having a wavelength of 900 nm or more and less than 1700 nm of 50% or more; A cylindrical part provided in a part is included.

An optical device according to the third aspect of the present invention is
At least a part of the reflective surface is provided outside the light passage region through which light can pass, and the lightness L in the Lab color system is 70 or more and the reflectance of light having a wavelength of 900 nm or more and less than 1500 nm is 70% or more It includes the cylindrical part with which it was equipped.

Further, for example, an optical device according to the present invention includes an optical system (13) that is provided in the light passage region and forms an image of incident light.
The reflection surface may be provided on the object side of the cylindrical portion.

  For example, the optical device according to the present invention may be a lens barrel (10, 60, 70).

  Further, for example, the optical device according to the present invention may include an operation member (14) that is provided on the image side with respect to the reflection surface and operates to move the optical system.

  Further, for example, the optical device according to the present invention may have an attachment portion (16) that is provided on the image side of the reflection surface and to which a support base that supports the cylindrical portion can be attached.

  Further, for example, the reflection surface may be provided in a region closer to the object side than two thirds from the end portion (12a, 62a) on the object side of the cylindrical portion.

  Further, for example, a film (32, 78) may be formed on the reflection surface by coating.

  For example, the reflective surface may be a film containing at least one element selected from Si, Al, Ti, Fe, Zn, Co, Mg, Ca, Sr, Ba, and Cu.

An optical device according to a fourth aspect of the present invention is
A cylindrical portion provided on the outer peripheral side of the optical system,
The cylindrical portion includes a first region (24, 64) provided on the outer peripheral surface (22, 63), and an outer peripheral surface closer to the image side than the first region, and reflects infrared rays more than the first region. And a second region (26, 66) having a small rate.

  Further, for example, an optical device according to the present invention is provided between the first region and the second region, as viewed in the axial (L) direction of the cylindrical portion, and operates to move the optical system. The operation member may be included.

  Further, for example, the optical device according to the present invention is provided between the first region and the second region as viewed in the axial direction of the cylindrical portion, and a support base that supports the cylindrical portion can be attached. The attachment part may be included.

An optical device according to a fifth aspect of the present invention is
An optical system for forming an image of incident light;
A cylindrical portion provided on the outer peripheral side of the optical system,
The cylindrical portions (72, 80) are different from the first region (74, 74a) provided on the outer peripheral surface (73) and in the region around the axis of the cylindrical portion. And a second region (76, 76a) having a lower infrared reflectance than the first region.

  Further, for example, in the optical device according to the present invention, a film (78) is formed by coating in the first region and the second region, and the film thickness of the first region is larger than the film thickness of the second region. May be thick.

An optical device according to a sixth aspect of the present invention is
A light passage area through which light can pass;
A cylindrical portion provided outside the light passage region;
The outer circumference of the cylindrical portion is such that the thickness of the first region of the cylindrical portion is larger than the thickness of the second region different from the first region when viewed in the direction around the axis of the cylindrical portion. And a coating film formed on the surface.

  Further, for example, in the cylindrical portion, the infrared reflectance of the first region may be higher than the infrared reflectance of the second region.

  In addition, for example, the optical device according to the present invention may include an attachment portion that is provided in the second region and is capable of attaching a support base that supports the cylindrical portion.

  Further, for example, the first region may be provided in a region of 4/5 or more when viewed in the direction around the axis of the cylindrical portion.

In addition, a method for manufacturing an optical device according to the present invention includes:
An optical system that forms an image of incident light is provided.
A cylindrical portion having a first region on the outer peripheral side of the optical system and a second region provided on the outer peripheral surface on the image side of the first region and having a lower infrared reflectance than the first region; It is provided on the outer peripheral side of the cylindrical portion.

  In the method for manufacturing an optical device according to the present invention, a support base that supports the cylindrical portion may be attached to the image side of the first region.

A method for manufacturing an optical device according to the second aspect of the present invention includes:
Form a cylindrical part outside the light passage area through which light can pass,
Applying a paint having a lightness L in the Lab color system of less than 40 and a light reflectance of 30% or more to a wavelength of 900 nm or more and less than 1700 nm on at least a part of the outer peripheral surface of the cylindrical part. Features.

A method for manufacturing an optical device according to the third aspect of the present invention includes:
Form a cylindrical part outside the light passage area through which light can pass,
Applying a paint having a lightness L in the Lab color system of 70 or more and a reflectance of light having a wavelength of 900 nm or more and less than 1700 nm to 70% or more on at least a part of the outer peripheral surface of the cylindrical part. Features.

A method for manufacturing an optical device according to the fourth aspect of the present invention includes:
Form a cylindrical part outside the light passage area through which light can pass,
Applying a paint having a lightness L in the Lab color system of 70 or more and a reflectance of light having a wavelength of 900 nm or more and less than 1700 nm to 70% or more on at least a part of the outer peripheral surface of the cylindrical part. Features.

In the method for manufacturing an optical device according to the present invention,
The coating material may be applied to the first region of the cylindrical portion thicker than a second region different from the first region.

  In the above description, in order to explain the present invention in an easy-to-understand manner, the description is made in association with the reference numerals of the drawings showing the embodiments. However, the present invention is not limited to this. The configuration of the embodiment described later may be improved as appropriate, or at least a part of the configuration may be replaced with another component. Further, the configuration requirements that are not particularly limited with respect to the arrangement are not limited to the arrangement disclosed in the embodiment, and can be arranged at a position where the function can be achieved.

Hereinafter, the present invention will be described based on embodiments shown in the drawings.
FIG. 1 is an overall view of a lens barrel according to a first embodiment of the present invention.
FIG. 2A is a schematic sectional view of a first region of the lens barrel shown in FIG.
FIG. 2B is a schematic sectional view of a second region of the lens barrel shown in FIG.
FIG. 3 is an enlarged view of the reflective coating film shown in FIG.
FIG. 4 is an overall view of a lens barrel according to the second embodiment of the present invention.
FIG. 5 is an overall view of a lens barrel according to the third embodiment of the present invention.
6 is a schematic sectional view of the lens barrel shown in FIG.
FIG. 7 is a schematic sectional view of a modification of the lens barrel shown in FIG.
FIG. 8 is an overall view of a lens hood according to an embodiment of the present invention.
FIG. 9 is an overall view of a support base mounting portion according to an embodiment of the present invention,
FIG. 10 is a diagram illustrating the relationship between the irradiation light wavelength and the reflectance when light is applied to the thermal barrier coating film.
First embodiment

  FIG. 1 is an overall view of a lens barrel 10 according to the first embodiment of the present invention. The lens barrel 10 has a cylinder 12 that forms the outer periphery of the lens barrel 10. The cylindrical body 12 has a substantially cylindrical shape, and a light passage region through which light can pass is formed in a direction along the central axis L of the cylindrical cylindrical body 12.

  An optical lens group 13 is provided in a light passage region formed inside the cylindrical body 12. The optical lens group 13 emits the light incident from the subject-side end 12 a that is one end of the lens barrel 10 to the imaging surface-side end 12 b that is the other end of the lens barrel 10. can do. Further, the lens barrel 10 according to the present embodiment can form an image of light incident from the subject side at a predetermined position after the light is emitted to the imaging surface side.

  A camera main body (not shown) is attached to the end 12 b on the imaging surface side of the cylinder 12 that forms the outer periphery of the lens barrel 10. The camera body includes a recording medium that records an image of light formed by the optical lens group 13 provided in the lens barrel 10. In addition, a lens hood 50 as shown in FIG. 8 can be attached to the end of the cylindrical body 12 on the subject side in order to prevent unnecessary light from entering the light passage region of the lens barrel 10. .

  In the embodiment, the lens barrel 10 will be mainly described as an example, but the optical device according to the present invention is not limited to this. Examples of the optical device according to the present invention include a lens hood, a camera body, and a camera (in which a lens barrel and a camera are integrated) in addition to a lens barrel. The optical device according to the present invention is not limited to a still camera, but includes a video camera, a teleconverter, a telescope, binoculars, and monoculars.

  The lens barrel 10 shown in FIG. 1 has a support base mounting portion 16 to which a support base that supports the cylindrical body 12 can be attached. The support base attaching part 16 has a ring part 17 through which the cylindrical body 12 of the lens barrel 10 is inserted, and a seat part 18 in which a support base fixing hole 28 for attaching a support base such as a tripod is formed. Further, the ring portion 17 of the support base mounting portion 16 is provided with an attachment screw 19 for fixing the support base mounting portion 16 to the cylindrical body 12.

  The lens barrel 10 is provided with a rotating ring 14 for adjusting the focus of the optical lens group 13 provided in the lens barrel 10. The rotating ring 14 is an operation member for operating the movement of the focus adjustment lens constituting the optical lens group 13. A photographer who uses the lens barrel 10, the camera, and the like operates the movement of the focus adjustment lens which is a part of the optical lens group 13 by rotating the rotating ring 14 to adjust the focus of the lens barrel 10. be able to.

  The rotating ring 14 attached to the lens barrel 10 is not limited to a so-called focus ring that adjusts the focus of the optical lens group 13 as in the present embodiment. For example, a zoom ring for adjusting the focal length between the optical lens group 13 and the imaging surface, a diaphragm ring for adjusting the amount of light transmitted through the optical lens group 13, or the like may be used.

  The outer peripheral surface 22 of the cylindrical body 12 is provided with a first region 24 and a second region 26 having different infrared reflectivities. The first region 24 is a reflecting surface having a higher infrared reflectance than the second region 26. On the other hand, the second region 26 is a region having a lower infrared reflectance than the first region 24.

  The cylindrical body 12 provided in the lens barrel 10 of the present embodiment has a first region 24 on the outer peripheral surface 22 on the subject side of the rotating ring 14 when viewed in the direction of the central axis L of the cylindrical body 12. A second region 26 is provided on the outer peripheral surface 22 on the imaging surface side. As shown in FIG. 2, a thermal barrier coating 32 is formed in the first region 24 along the outer peripheral surface of the tube main body 30.

  The thermal barrier coating film 32 according to this embodiment contains at least one element selected from Si, Al, Ti, Fe, Zn, Co, Mg, Ca, Sr, Ba, and Cu. The thermal barrier coating film 32 preferably contains a plate-like or box-shaped pigment 36 as shown in FIG. Furthermore, these plate-like or box-shaped pigments 36 include at least one element selected from Si, Al, Ti, Fe, Zn, Co, Mg, Ca, Sr, Ba, and Cu. It is preferable.

  By including the pigment 36 containing Si, Al, Ti, Fe, Zn, Co, Mg, Ca, Sr, Ba, and Cu in the thermal barrier coating 32, the thermal barrier coating 32 effectively absorbs infrared rays. Can be reflected. Furthermore, if the shape of the pigment 36 contained in the thermal barrier coating film 32 is a plate or box shape, the thermal barrier coating film 32 can reflect infrared rays more effectively. This is because the pigment 36 shown in FIG. 3 effectively reflects wavelength light (infrared rays) in the infrared region of the light incident on the thermal barrier coating. The thermal barrier coating 32 may include a pigment or dye for changing the color of the thermal barrier coating 32 in addition to the pigment 36 that efficiently reflects infrared rays. Thereby, the color of the thermal barrier coating film 32 can be an arbitrary color while the thermal barrier coating layer 32 has a function of reflecting infrared rays.

  The first region 24 where the thermal barrier coating film 32 is formed is formed by the surface of a material such as another general coating film, and compared with other regions having the same level of brightness as the first region 24, High reflectivity for reflecting light that gives thermal energy to objects. For example, in the first region 24, when the lightness L in the Lab color system is less than 40, the reflectance of light having a wavelength of 900 nm or more and less than 1700 nm is 30% or more.

  Further, for example, when the lightness L in the Lab color system is 40 or more and less than 70, the first region 24 has a reflectance of 50% or more for light having a wavelength of 900 nm or more and less than 1700 nm. Further, for example, when the lightness L in the Lab color system is 70 or more, the first region 24 has a light reflectance of 70% or more at a wavelength of 900 nm or more and less than 1700 nm.

  FIG. 10 is a diagram illustrating the relationship between the irradiation light wavelength and the reflectance when light is applied to the thermal barrier coating film.

  In FIG. 10, the coating film a <b> 1 is a coating film that has a reflectance of visible light (wavelength of 400 nm or more and 800 nm or less) of about 10% and looks like a color close to black. The coating film b has a visible light reflectance of about 25% and is a coating film that looks gray. The coating film c has a visible light reflectance of about 65% and is a coating film that looks like a color close to white.

  In the infrared wavelength region (wavelength 900 nm or more and less than 1700 nm), the coating film a1 has a light reflectance of 30% or more (about 45%), and the coating film b has a light reflectance of 50% or more ( The coating film c has a light reflectance of 70% or more (about 85%) and is a thermal barrier coating film.

  The coating film a2 is also a thermal barrier coating film having a visible light reflectance of 10% and an infrared light average reflectance of 30% or more (about 35%). The average reflectance can be calculated by the following formula 1.

  In Equation 1, Rλ (i) is the reflectance of each wavelength, and λ (i) is λ (1) = 900, λ (2) = 910, λ (3) = 920,... Λ (n) = 1700 nm. And

  The thermal barrier coating is not limited to the coatings a1, a2, b, and c shown in FIG. 10, but the lightness L in the Lab color system is less than 40, and the reflectance of light having a wavelength of 900 nm or more and less than 1700 nm is shown. It is 30% or more, the lightness L in the Lab color system is 40 or more and less than 70, and the reflectance of light having a wavelength of 900 nm or more and less than 1700 nm is 50% or more, or the lightness L in the Lab color system is 70 or more. The reflectance of light having a wavelength of 900 nm or more and less than 1700 nm may be 70% or more.

  More preferably, even if the thermal barrier coating film has a low reflectance in at least a part of the wavelength region of infrared light, the average reflectance of infrared light is preferably higher than the reflectance of visible light.

  For example, the thermal barrier coating film preferably has an average reflectance of infrared light (wavelength of 900 nm or more and less than 1700 nm) higher by 10% or more than an average reflectance of visible light (wavelength of 400 nm or more and 800 nm or less). For example, the thermal barrier coating film further preferably has an average reflectance of infrared light that is 20% or more higher than the average reflectance of visible light.

  In FIG. 10, the coating film d has a visible light reflectance of 10%, an infrared light average reflectance of less than 30% (about 10%), and is not a heat-shielding coating film of the black color of the comparative example. It is a coating film.

  In the visible light wavelength region (wavelength 400 nm or more and 800 nm or less), the coating film a1 and the coating film d have substantially the same reflectance (about 10%), but the infrared light wavelength region (wavelength 900 nm or more and less than 1700 nm). ), The reflectance (about 45%) of the coating film a1 is about 4.5 times that of the coating film d. For this reason, although the optical apparatus in which the coating film a1 was formed looks almost black like the optical apparatus in which the coating film d is formed, for example, even if it is used under the sun (a state in which a lot of sunlight is irradiated) Further, since the reflectance of infrared light is high, the temperature rise can be suppressed as compared with the optical device on which the coating film d is formed.

  As described above, the first region 24 shown in FIG. 1 has a high reflectivity for reflecting light that is converted into thermal energy when the object is irradiated. Therefore, for example, even when used in an environment where a large amount of sunlight is irradiated, the lens barrel 10 according to the present embodiment effectively prevents the temperature rise of the cylindrical body 12 including the first region 24. be able to. Further, since the temperature rise of the cylindrical body 12 is prevented, a photographer who uses the lens barrel 10 can comfortably operate the lens barrel 10 while directly shaking the surface of the lens barrel 10 by hand. it can.

  The cylindrical body 12 including the first region 24 has, for example, at least one of Si, Al, Ti, Fe, Zn, Co, Mg, Ca, Sr, Ba, and Cu on the outer peripheral surface of the cylinder main body 30 shown in FIG. It can be produced by applying a paint containing one pigment 36. The cylinder main body 30 is made of a metal material containing Mg, Al or the like, or a resin material such as polycarbonate. The first region 24 in which the thermal barrier coating film 32 is formed is obtained by applying a coating material that is a raw material of the thermal barrier coating layer 32 to the outer peripheral surface of the cylinder main body portion 30 formed of a metal or a resin material. Manufactured.

  A thermal barrier coating 32 is formed in the first region 24 shown in FIG. 1, whereas a coating coating 34 shown in FIG. 2 is formed in the second region 26 according to the present embodiment. Note that the coating film 34 may contain a pigment having a spherical shape, a needle shape, or the like.

  In the present embodiment, the coating film 34 applied to the second region 26 has a lower infrared reflectance than the thermal barrier coating film 32, but covers the surface of the cylinder main body 30 in the same manner as the thermal barrier coating film 32. The cylinder body 30 is protected from physical and chemical impacts. Further, since the second region 26 has a low infrared reflectance, the infrared reflectance generated inside the cylindrical body 12 (on the central axis L side of the cylindrical body 12) is also small, and the heat generated inside the cylindrical body 12 is small. Can be efficiently released from the first region 24 to the outside of the lens barrel 10.

  Similar to the first region 24, the second region 26 is manufactured, for example, by applying a coating material, which is a raw material for the coating film 34, to the outer peripheral surface of the cylinder main body 30. In the lens barrel 10 according to the first embodiment shown in FIG. 1, a thermal barrier coating 32 is formed on the outer peripheral surface of the rotary ring 14 provided between the first region 24 and the second region 26. It may be covered with a layer of rubber material or the like.

  Since the lens barrel 10 according to the first embodiment of the present invention includes the cylindrical body 12 provided with the first region 24 having a high reflectivity for reflecting light that gives thermal energy to the object, a large amount of infrared rays are irradiated. Even when used in an environment, the temperature rise of the cylinder 12 including the first region 24 can be effectively prevented. In addition, since the temperature rise of the cylindrical body 12 is effectively prevented, a photographer who uses the lens barrel 10 can comfortably operate the lens barrel 10 while directly shaking the surface of the lens barrel 10 by hand. Can be done.

  In particular, in the lens barrel 10 shown in FIG. 1, the first region 24 is provided in the region on the subject side of the cylindrical body 12. Therefore, the lens barrel 10 can effectively prevent an increase in the temperature of the outer peripheral surface 22 of the subject side portion of the cylindrical body 12, which is a portion that is easily touched by the photographer. For example, the first region 24 is preferably provided in a region closer to the subject than the two thirds from the end 12a on the subject side of the cylindrical body 12.

  Many of the lens barrels 10 such as telephoto lenses that are suitably used for outdoor photography have a large weight. Therefore, a photographer or the like who uses such a lens barrel 10 often performs photographing while supporting the outer peripheral surface 22 of the subject side portion of the cylindrical body 12 with his / her hand.

  The lens barrel 10 may be used in a state in which a support base such as a tripod is attached to the support base mounting portion 16 provided in the lens barrel 10 and the lens barrel 10 is supported by the tripod or the like. In such a case, the photographer or the like holds the lens barrel 10 with both hands by touching the subject side portion of the cylinder 12 with one hand and attaching the other hand to the release button of the camera. In many cases, shooting is performed in a stable state. The lens barrel 10 shown in FIG. 1 is suitable for such use because the temperature rise of the outer peripheral surface 22 of the subject side portion of the cylinder 12 can be effectively prevented.

In addition, although the coating film 34 was formed in the 2nd area | region 26 in the lens barrel 10 which concerns on 1st Embodiment as shown in FIG. 2, the 2nd area | region with which the imaging surface side of the cylinder 12 is equipped. The number 26 is not limited to this. For example, a thermal barrier coating film 32 that is thinner than the thermal barrier coating layer 32 formed in the first region 24 may be formed in the second region 26. Further, the second region 26 may be provided on the imaging surface side of the cylinder 12, for example, close to a position where a heat source such as a motor or an electronic board is installed inside the cylinder 12. It may be provided. As a result, the lens barrel 10 efficiently discharges the heat generated inside the cylinder 12 to the outside of the lens barrel 10, and an excessive amount of motor or electronic board or the like disposed inside the lens barrel 10. Temperature rise can be prevented.
Second embodiment

  FIG. 4 is an overall view of a lens barrel 60 according to the second embodiment of the present invention. The lens barrel 60 is the same as the lens barrel 10 according to the first embodiment shown in FIG. 1 except that the positions of the first region 64 and the second region 66 provided on the outer peripheral surface 63 of the cylindrical body 62 are different. is there.

  The outer peripheral surface 63 of the cylindrical body 62 is provided with a first region 64 and a second region 66 having different infrared reflectivities. The first region 64 is a reflecting surface having a higher infrared reflectance than the second region 66. In contrast, the second region 66 has a lower infrared reflectance than the first region 64.

  The cylindrical body 62 provided in the lens barrel 60 of the present embodiment has a first region 64 on the outer peripheral surface 63 on the subject side from the support base mounting portion 16 when viewed in the direction of the central axis L of the cylindrical body 62. A second region 66 is provided on the outer peripheral surface 63 closer to the imaging surface than the mounting portion 16. The first region 64 and the second region 66 are the same as the first region 24 and the second region 26 according to the first embodiment except that the arrangement on the outer peripheral surface 63 of the cylindrical body 62 is different.

  Similarly to the lens barrel 10 according to the first embodiment, the lens barrel 60 according to the second embodiment of the present invention includes a first region 64 having a high reflectance that reflects light that gives thermal energy to an object. A cylindrical body 62 is included. Therefore, even when used in an environment where a large amount of infrared light is irradiated, it is possible to effectively prevent the temperature increase of the cylindrical body 62 including the first region 64. Further, since the temperature rise of the cylindrical body 62 is effectively prevented, a photographer who uses the lens barrel 60 can comfortably operate the lens barrel 60 while directly shaking the surface of the lens barrel 60 by hand. Can be done.

In particular, when the lens barrel 60 is used with a tripod attached to the support base mounting portion 16 and supported by the tripod or the like, a photographer or the like who uses the lens barrel 60 is closer to the subject side than the support base mounting portion 16. In many cases, the lens barrel 60 is supported by touching the outer peripheral surface 63 with a hand. The photographer holds the lens barrel 60 by touching the outer peripheral surface 63 on the subject side of the support base mounting portion 16 with one hand and touching the release button of the camera with the other hand, and the support base mounting portion 16. Alternatively, the photographing direction is often changed by rotating the lens barrel 60 around a tripod or the like attached thereto. Since the lens barrel 60 according to the second embodiment has the first region 64 that effectively prevents the temperature increase of the outer peripheral surface 63 on the outer peripheral surface 63 of the subject side portion relative to the support base mounting portion 16. It is particularly preferably used for such use.
Third embodiment

  FIG. 5 is an overall view of a lens barrel 70 according to the third embodiment of the present invention. The lens barrel 70 is the same as the lens barrel 10 according to the first embodiment shown in FIG. 1 except that the positions of the first region 74 and the second region 76 provided on the outer peripheral surface 73 of the cylindrical body 72 are different. is there.

  A first region 74 and a second region 76 having different infrared reflectivities are provided on the outer peripheral surface 73 of the cylindrical body 72. The first region 74 is a reflecting surface having a higher infrared reflectance than the second region 76. In contrast, the second region 76 has a lower infrared reflectance than the first region 74.

  The cylindrical body 72 provided in the lens barrel 70 of the third embodiment has a first region 74 on the outer peripheral surface 73 on the upper side when viewed in the direction around the axis of the cylindrical body 72 (the rotational direction about the central axis L). And has a second region 76 on the outer peripheral surface 73 on the lower side.

  The upper side of the lens barrel 70 according to the third embodiment means that when the camera is attached to the end 72b on the imaging surface side of the cylindrical body 72 and the lens barrel 70 is used for photographing or the like, the direction is mainly empty. It is the side that faces. In addition, the lower side in the lens barrel 70 according to the third embodiment is the side opposite to the upper side, and when the lens barrel 70 is used for shooting or the like, it is the side that faces the ground. is there. On the upper side of the outer peripheral surface 73 of the cylindrical body 72, for example, a distance scale 20 representing the photographing distance of the optical lens group 13 provided in the lens barrel 70 is disposed. In addition, on the lower side of the outer peripheral surface 73 of the cylindrical body 72, for example, the seat portion 18 of the support base mounting portion 16 is disposed.

  As shown in FIG. 6, a thermal barrier coating 78 is formed in the first region 74 and the second region 76 along the outer peripheral surface of the tube main body 30. In the lens barrel 70 according to the present embodiment, the thickness of the thermal barrier coating film 78 in the first region 74 is thicker than the thickness of the thermal barrier coating layer 78 in the second region 76. Accordingly, the first region 74 has a higher infrared reflectance than the second region 76.

  The thermal barrier coating 78 shown in FIG. 6 has the same components as the thermal barrier coating 32 according to the first embodiment shown in FIG. It is formed on the outer peripheral surface of the main body 30. That is, the first region 74 and the second region 76 are manufactured by applying a coating material, which is a raw material for the thermal barrier coating film 78, to the outer peripheral surface of the cylinder main body 30 formed of a metal or a resin material. . At this time, a coating film thicker than the second region 76 is formed in the first region 74 by applying a paint thicker than the second region 76.

  Since the lens barrel 70 according to the third embodiment of the present invention includes the cylindrical body 72 provided with the first region 74 having a high reflectivity for reflecting light that gives thermal energy to the object, a large amount of infrared rays are irradiated. Even when used in an environment, the temperature rise of the cylinder 72 including the first region 74 can be effectively prevented. Further, since the temperature rise of the cylinder 72 is effectively prevented, a photographer who uses the lens barrel 70 can easily operate the lens barrel 70 while directly shaking the surface of the lens barrel 70 by hand. Can be done.

  Further, the cylindrical body 72 of the lens barrel 70 according to the third embodiment of the present invention is provided in a first region 74 and a region different from the first region 74 when viewed in the direction around the axis of the cylindrical body 72. And a second region 76 having a lower infrared reflectance than the region 74. When the lens barrel 70 is used for shooting outdoors in the daytime, the upper portion of the lens barrel 70 tends to be irradiated with more sunlight than the lower portion. Therefore, the photographer can effectively prevent the temperature rise of the entire cylinder 72 by installing the lens barrel 70 in a state where the first region 74 of the cylinder 72 faces the sky. . This is because the first region 74 having a high infrared reflectance is arranged on the upper side irradiated with more infrared rays.

   In the cylindrical body 72 shown in FIG. 6, the first region 74 having a high infrared reflectance may be provided in a region of 4/5 or more when viewed in the direction around the axis of the cylindrical body 72. With such a configuration, for example, when a photographer uses the lens barrel 70 in a state in which the lens barrel 70 is rotated about 90 ° about the central axis L with respect to the state shown in FIG. However, the temperature rise of the entire cylinder 72 can be effectively prevented.

Further, in the cylindrical body 72 according to the third embodiment shown in FIGS. 5 and 6, the second region 76 is provided with a thermal barrier coating film 78 having a thickness smaller than that of the first region 74. The region 76 is not limited to this. For example, as in the cylindrical body 80 according to the modification shown in FIG. 7, the thermal barrier coating 32 is formed in the first region 74a, and the coating coating 34 is formed in the second region 76a. Good. Note that the thermal barrier coating film 32 and the coating coating film 34 shown in FIG. 7 are made of a cylinder main body by the same material and method as the thermal barrier coating film 32 and the coating coating film 34 shown in FIGS. 30 is formed on the outer peripheral surface.
Other embodiments

  In the lens barrels 10, 60, 70 in the first to third embodiments, the first regions 24, 64, 74, 74 a having a high infrared reflectance are one of the outer peripheral surfaces of the cylinders 12, 62, 72, 80. Provided in the department. However, the optical device according to the present invention is not limited to this. For example, the first region having a high infrared reflectance may be formed on the entire outer peripheral surface of the cylindrical body.

  Furthermore, the thermal barrier coatings 32 and 78 formed in the first region may be the outermost surface films formed on the outermost outermost surfaces of the cylinders 12, 62, 72, and 80. It may be an intermediate film or an intermediate surface in which another film is laminated thereon. Further, the thermal barrier coatings 32 and 78 can be formed on the inner peripheral surfaces of the cylinders 12, 62, 72 and 80.

  The first regions 24, 64, 74, 74 a having high infrared reflectance are not limited to the form shown in FIG. 2 or the like in which the thermal barrier coating 32 is formed on the cylinder body 30. For example, in the first regions 24, 64, 74, and 74a having high infrared reflectance, a material that effectively reflects infrared rays, such as the pigment 36 shown in FIG. Alternatively, it may be formed by increasing the infrared reflectance of the tube body 30 itself.

  Moreover, the lens hood 50 shown in FIG. 8 may be attached to the cylinders 12, 62, 72 in the lens barrels 10, 60, 70 according to the first to third embodiments. The lens hood 50 is attached to the end 12a on the subject side of the cylindrical body 12 shown in FIG. The outer peripheral surface 52 of the lens hood 50 is provided with a thermal barrier coating film 32 as in the outer peripheral surface 22 related to the first region 24 of the cylindrical body 12 shown in FIGS. 1 and 2.

  9 may be attached to the cylindrical bodies 12, 62, 72 in the lens barrels 10, 60, 70 according to the first to third embodiments. The support base attaching part 54 is attached to the lens barrel 10 instead of the support base attaching part 54 shown in FIG. The surface 56 of the support mounting portion 54 is provided with a thermal barrier coating film 32 in the same manner as the outer peripheral surface 22 related to the first region 24 of the cylindrical body 12 shown in FIGS. 1 and 2.

  The surfaces of the lens hood 50 shown in FIG. 8 and the support base mounting portion 54 shown in FIG. 9 are provided with a thermal barrier coating 32 having a high reflectivity for reflecting light that gives thermal energy to the object. Therefore, even when the lens hood 50 or the support base mounting portion 54 is used in an environment where a large amount of infrared rays are irradiated, the surface temperature thereof is unlikely to rise.

  Further, the lens hood 50 or the support mounting portion 54 attached to the lens barrel 10, 60, 70 is disposed at a portion where a photographer who uses the lens barrel 10, 60, 70 is easily touched by hand. obtain. Since the surface temperature of the lens hood 50 or the support base mounting portion 54 is unlikely to rise, a photographer or the like can comfortably operate the lens barrel 10, 60, 70 to which the lens hood 50 or the support base mounting portion 54 is attached. Can be done.

FIG. 1 is an overall view of a lens barrel according to a first embodiment of the present invention. FIG. 2 is a schematic sectional view of the lens barrel shown in FIG. FIG. 3 is an enlarged view of the reflective coating film shown in FIG. FIG. 4 is an overall view of a lens barrel according to the second embodiment of the present invention. FIG. 5 is an overall view of a lens barrel according to the third embodiment of the present invention. FIG. 6 is a schematic sectional view of the lens barrel shown in FIG. FIG. 7 is a schematic sectional view of a modification of the lens barrel shown in FIG. FIG. 8 is an overall view of a lens hood according to an embodiment of the present invention. FIG. 9 is an overall view of a support mounting portion according to an embodiment of the present invention. FIG. 10 is a diagram illustrating the relationship between the irradiation light wavelength and the reflectance when light is applied to the thermal barrier coating film.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,60,70 ... Lens barrel 12,62,72,80 ... Cylinder 13 ... Optical lens group 14 ... Rotation ring 16 ... Supporting base mounting part 22,63,73 ... Outer peripheral surface 24,64,74 of cylinder 74a ... first region 26, 66, 76, 76a ... second region 32, 78 ... thermal barrier coating

Claims (25)

  At least a part of the reflective surface is provided outside the light passage region through which light can pass, and the lightness L in the Lab color system is less than 40 and the reflectance of light with a wavelength of 900 nm or more and less than 1700 nm is 30% or more. An optical device comprising a cylindrical portion provided in the above.   A reflection surface provided outside the light passage region through which light can pass and having a lightness L in the Lab color system of 40 or more and less than 70 and a reflectance of light having a wavelength of 900 nm or more and less than 1700 nm of 50% or more; An optical device comprising a cylindrical portion provided in a part.   At least a part of the reflection surface is provided outside the light passage region through which light can pass, and the lightness L in the Lab color system is 70 or more and the reflectance of light having a wavelength of 900 nm or more and less than 1700 nm is 70% or more. An optical device comprising a cylindrical portion provided in the above. The optical device according to any one of claims 1 to 3,
An optical system provided in the light passage region and forming an image of incident light,
The optical apparatus, wherein the reflection surface is provided on the object side of the cylindrical portion.   The optical apparatus according to claim 4, wherein the optical apparatus is a lens barrel. An optical device according to claim 4 or 5, wherein
An optical apparatus comprising an operation member provided on the image side of the reflecting surface and for operating movement of the optical system. An optical device according to any one of claims 4 to 6, comprising:
An optical apparatus comprising: an attachment portion that is provided on the image side of the reflection surface and to which a support base that supports the cylindrical portion can be attached. An optical device according to any one of claims 4 to 7,
The optical apparatus, wherein the reflecting surface is provided in a region closer to the object side than two thirds from an end portion on the object side of the cylindrical portion. An optical device according to any one of claims 1 to 8,
An optical device, wherein a film is formed on the reflection surface by coating. The optical device according to claim 9, comprising:
The optical device is characterized in that the reflecting surface is a film containing at least one element selected from Si, Al, Ti, Fe, Zn, Co, Mg, Ca, Sr, Ba, and Cu. An optical system for forming an image of incident light;
A cylindrical portion provided on the outer peripheral side of the optical system,
The cylindrical portion includes a first region provided on the outer peripheral surface, and a second region provided on the outer peripheral surface on the image side of the first region and having a lower infrared reflectance than the first region. An optical device characterized by the above. An optical device according to claim 11, comprising:
An optical device comprising an operation member provided between the first region and the second region as viewed in the axial direction of the cylindrical portion, for operating movement of the optical system. An optical device according to claim 11 or claim 12,
An optical device comprising an attachment portion that is provided between the first region and the second region as viewed in the axial direction of the tubular portion and is capable of attaching a support base that supports the tubular portion. . An optical system for forming an image of incident light;
A cylindrical portion provided on the outer peripheral side of the optical system,
The cylindrical portion is provided in a region different from the first region when viewed in the first region provided on the outer peripheral surface and in the direction around the axis of the cylindrical portion, and has an infrared reflectance higher than that of the first region. An optical device having a small second region. An optical device according to claim 14, comprising:
An optical device, wherein a film is formed by coating in the first region and the second region, and a film thickness of the first region is larger than a film thickness of the second region. A light passage area through which light can pass;
A cylindrical portion provided outside the light passage region;
The outer circumference of the cylindrical portion is such that the thickness of the first region of the cylindrical portion is larger than the thickness of the second region different from the first region when viewed in the direction around the axis of the cylindrical portion. An optical device comprising a coating film formed on a surface. An optical device according to claim 16, comprising:
The optical device, wherein the cylindrical part has an infrared reflectance of the first region higher than an infrared reflectance of the second region. An optical device according to any one of claims 14 to 17,
An optical device comprising an attachment portion provided in the second region and capable of attaching a support base for supporting the cylindrical portion. The optical device according to any one of claims 14 to 18, comprising:
The optical device is characterized in that the first region is provided in a region of 4/5 or more in the direction around the axis of the cylindrical portion. An optical system that forms an image of incident light is provided.
A cylindrical portion having a first region on the outer peripheral side of the optical system and a second region provided on the outer peripheral surface on the image side of the first region and having a lower infrared reflectance than the first region; A method for manufacturing an optical device, comprising: providing an outer peripheral side of a cylindrical portion. A method of manufacturing an optical device according to claim 20,
A method for manufacturing an optical device, comprising: mounting a support base for supporting the cylindrical portion closer to the image side than the first region. Form a cylindrical part outside the light passage area through which light can pass,
Applying a paint having a lightness L in the Lab color system of less than 40 and a light reflectance of 30% or more to a wavelength of 900 nm or more and less than 1700 nm on at least a part of the outer peripheral surface of the cylindrical part. A method of manufacturing an optical device. Form a cylindrical part outside the light passage area through which light can pass,
Applying a paint having a lightness L in the Lab color system of 40 or more and less than 70 and a reflectance of light of a wavelength of 900 nm or more and less than 1700 nm to 50% or more on at least a part of the outer peripheral surface of the cylindrical part. A method for manufacturing an optical device. Form a cylindrical part outside the light passage area through which light can pass,
Applying a paint having a lightness L in the Lab color system of 70 or more and a reflectance of light having a wavelength of 900 nm or more and less than 1700 nm to 70% or more on at least a part of the outer peripheral surface of the cylindrical part. A method of manufacturing an optical device. A method for manufacturing an optical device according to any one of claims 22 to 24, wherein:
The method of manufacturing an optical device, wherein the coating material is applied to the first region of the cylindrical portion thicker than a second region different from the first region.

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