WO2017159581A1 - Infrared lens module - Google Patents

Infrared lens module Download PDF

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Publication number
WO2017159581A1
WO2017159581A1 PCT/JP2017/009845 JP2017009845W WO2017159581A1 WO 2017159581 A1 WO2017159581 A1 WO 2017159581A1 JP 2017009845 W JP2017009845 W JP 2017009845W WO 2017159581 A1 WO2017159581 A1 WO 2017159581A1
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WO
WIPO (PCT)
Prior art keywords
lens
cap
temperature
heater
lens module
Prior art date
Application number
PCT/JP2017/009845
Other languages
French (fr)
Japanese (ja)
Inventor
長谷川　幹人
遼太 山口
明徳 加原
Original Assignee
住友電気工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2016131645A external-priority patent/JP6798161B2/en
Application filed by 住友電気工業株式会社 filed Critical 住友電気工業株式会社
Priority to CN201780016231.3A priority Critical patent/CN108780265A/en
Priority to US16/085,075 priority patent/US20190094484A1/en
Publication of WO2017159581A1 publication Critical patent/WO2017159581A1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/55—Details of cameras or camera bodies; Accessories therefor with provision for heating or cooling, e.g. in aircraft
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B41/00—Special techniques not covered by groups G03B31/00 - G03B39/00; Apparatus therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof

Definitions

  • the present invention relates to an infrared lens module.
  • the infrared camera As a countermeasure when the infrared camera is used in a low temperature environment, the infrared camera is stored in a case having a window that transmits infrared rays, and the window is heated by a heater to prevent condensation and freezing. It has been proposed (see, for example, Japanese Patent Laid-Open No. 2001-57642 (Patent Document 1)).
  • the infrared lens module includes a lens that transmits infrared rays, a lens barrel that holds the lens, and a temperature adjusting device that is disposed on the lens and adjusts the temperature of the lens.
  • FIG. 2 is a schematic cross-sectional view showing a structure of an infrared lens module according to Embodiment 1.
  • FIG. 6 is a schematic cross-sectional view showing a structure of an infrared lens module according to Embodiment 2.
  • FIG. 6 is a schematic cross-sectional view showing a structure of an infrared lens module according to Embodiment 3.
  • FIG. 6 is a schematic cross-sectional view showing a structure of an infrared lens module according to Embodiment 4.
  • FIG. 10 is a schematic cross-sectional view showing the structure of an infrared lens module in a fifth embodiment.
  • FIG. 10 is a schematic cross-sectional view showing the structure of an infrared lens module in a sixth embodiment.
  • FIG. 10 is a schematic cross-sectional view showing the structure of an infrared lens module in a seventh embodiment.
  • FIG. 10 is a schematic cross-sectional view showing the structure of an infrared lens module in an eighth embodiment.
  • FIG. 10 is a schematic cross-sectional view showing the structure of an infrared lens module in a ninth embodiment.
  • FIG. 10 is a schematic cross-sectional view showing the structure of an infrared lens module in a tenth embodiment.
  • FIG. 22 is a schematic cross-sectional view showing the structure of an infrared lens module in an eleventh embodiment.
  • Patent Document 1 does not adjust the temperature of the infrared lens, but adjusts the temperature of the window of the case. For this reason, a case having a window that transmits infrared rays is indispensable, which increases the size of the device and increases the cost. Therefore, an object is to provide an infrared lens module in which the temperature of the infrared lens can be easily adjusted.
  • an infrared lens module in which the temperature of the infrared lens can be easily adjusted can be provided.
  • An infrared lens module includes a lens that transmits infrared rays, a lens barrel that holds the lens, and a temperature adjustment device that is disposed in the lens and adjusts the temperature of the lens.
  • a temperature adjusting device that adjusts the temperature of the lens is arranged in the lens.
  • the temperature adjustment device is installed outside the infrared lens module, and the lens temperature is adjusted by the temperature adjustment device placed on the lens, rather than adjusting the lens temperature from the outside. Easy to do.
  • an infrared lens module in which the temperature of the infrared lens can be easily adjusted can be provided.
  • an interval may be formed between the lens and the lens barrel.
  • the temperature adjusting device may be disposed on at least one of the outer peripheral surface of the lens and the outer edge region of the lens surface.
  • the material constituting the lens may be zinc sulfide (ZnS).
  • ZnS zinc sulfide
  • a lens composed of ZnS has a small change in refractive index with respect to a temperature change. Therefore, by adopting a lens composed of ZnS in the lens module of the present application, it becomes easy to set the focal position of the lens within a desired range.
  • the infrared lens module includes a lens that transmits infrared rays and a lens barrel that holds the lens.
  • the lens barrel includes a lens barrel body and a cap disposed on one end side of the lens barrel body. The lens is held between the lens barrel body and the cap. A heater for adjusting the temperature of the lens is installed in the cap.
  • a heater is installed on the cap that holds the lens. Rather than adjusting the temperature of the lens from the outside of the infrared lens module, adjusting the temperature of the lens with a heater installed in the cap makes it easy to adjust the lens to a desired temperature.
  • adjusting the temperature of the lens with a heater installed in the cap makes it easy to adjust the lens to a desired temperature.
  • the region in contact with the lens of the lens barrel body may be made of a material having a lower thermal conductivity than the region in contact with the lens of the cap.
  • the emissivity of the surface of the cap other than the surface exposed to the outside may be 0.7 or less. By doing so, the amount of heat released from the cap is reduced, and the adjustment of the lens temperature is further facilitated. From the viewpoint of further facilitating adjustment of the lens temperature, the emissivity is preferably 0.5 or less, and more preferably 0.3 or less.
  • the material constituting the lens may be zinc sulfide.
  • a lens composed of ZnS has a small change in refractive index with respect to a temperature change. Therefore, by adopting a lens composed of ZnS in the lens module of the present application, it becomes easy to set the focal position of the lens within a desired range.
  • (Embodiment 1) 1 is a schematic cross-sectional view showing a cross section including the optical axis of the lens module according to Embodiment 1.
  • FIG. 1 the lens module 1 according to the first embodiment includes a lens 10, a lens barrel 50, and a heater 61.
  • the lens 10 is an infrared lens that transmits infrared light, more specifically, light having a wavelength of 8 ⁇ m to 14 ⁇ m.
  • the material constituting the lens 10 is, for example, ZnS.
  • the lens 10 includes a first lens surface 11, a second lens surface 12, and an outer peripheral surface 13.
  • the first lens surface 11 includes a central region 11A that is a convex surface that is located at the center and intersects the optical axis C, and an outer edge region 11B that is a plane surrounding the central region 11A.
  • the second lens surface 12 includes a central region 12A that is a concave surface that is located at the center and intersects the optical axis C, and an outer edge region 12B that is a plane surrounding the central region 12A.
  • the lens barrel 50 includes a cap 20 and a lens barrel body 30.
  • the lens barrel body 30 has a cylindrical shape.
  • the lens barrel body 30 supports the lens 10 by contacting the outer edge region 12B and the outer peripheral surface 13 of the second lens surface 12 at the end.
  • the lens barrel body 30 is made of a metal such as a resin or an aluminum alloy.
  • the cap 20 is cylindrical and has a shape in which a projecting portion 21 projecting radially inward is formed at one end.
  • the cap 20 is made of a metal such as an aluminum alloy.
  • a gap is formed between the inner peripheral surface 22 of the cap 20 and the outer peripheral surface 13 of the lens 10.
  • the protruding portion 21 of the cap 20 and the outer edge region 11B of the first lens surface 11 are in contact with each other.
  • a gap is formed between the outer peripheral side of the region in contact with the outer edge region 11B in the protruding portion 21 and the outer edge region 11B.
  • the cap 20 is fixed to the barrel main body 30 in a state where the end of the barrel main body 30 is fitted to the end opposite to the side on which the protruding portion 21 is formed. In this way, the lens 10 is held by the lens barrel 50.
  • the heater 61 as a temperature adjusting device for adjusting the temperature of the lens 10 is fixed to the outer peripheral surface 13 of the lens 10.
  • a heater 61 is disposed inside a gap formed between the outer peripheral surface 13 of the lens 10 and the inner peripheral surface 22 of the cap 20.
  • the heater 61 is disposed on the outer peripheral surface 13 of the lens 10 so as to extend along the circumferential direction.
  • the heater 61 may be disposed so as to contact the outer peripheral surface 13 over the entire circumference.
  • a wiring 62 is connected to the heater 61.
  • the wiring 62 is connected to a power source (not shown).
  • a heater 61 driven by electric power supplied from the power source via the wiring 62 adjusts the temperature of the lens 10 by heating the lens 10.
  • the heater 61 is, for example, a film heater.
  • a heater 61 that adjusts the temperature of the lens 10 is fixed to the outer peripheral surface 13 of the lens 10.
  • the heater 61 is installed outside the lens module 1, and the temperature of the lens 10 is not adjusted from the outside, but the temperature of the lens 10 is adjusted (heated) by the heater 61 fixed to the lens 10. It is easy to adjust to a desired temperature.
  • a gap is formed between the lens 10 and the lens barrel 50 (cap 20). Thereby, heat conduction with the cap 20 is suppressed, and adjustment of the temperature of the lens 10 is further facilitated.
  • the lens module 1 of the present embodiment is an infrared lens module in which the temperature of the lens 10 can be easily adjusted.
  • the lens barrel body 30 that contacts the lens 10 can be made of resin.
  • a resin having a thermal conductivity smaller than that of a metal as a material constituting the lens barrel body 30 in contact with the lens 10 heat conduction with the lens barrel body 30 is suppressed, and the temperature of the lens 10 is adjusted. Is even easier.
  • FIG. 2 is a schematic cross-sectional view showing a cross section including the optical axis of the lens module according to the second embodiment.
  • the lens module 1 includes a lens 10, a lens barrel 50, and a heater 61.
  • the lens 10 is an infrared lens that transmits infrared rays.
  • the material constituting the lens 10 is, for example, ZnS.
  • the lens 10 includes a first lens surface 11, a second lens surface 12, and an outer peripheral surface 13.
  • the first lens surface 11 includes a central region 11A that is a concave surface that is located at the center and intersects the optical axis C, and an outer edge region 11B that is a plane surrounding the central region 11A.
  • the second lens surface 12 includes a central region 12A that is a convex surface that is located at the center and intersects the optical axis C, and an outer edge region 12B that is a plane surrounding the central region 12A.
  • the lens barrel 50 includes a cap 20 and a lens barrel body 30.
  • the lens barrel body 30 has a cylindrical shape.
  • the lens barrel body 30 includes a cylindrical inner cell 31, a middle cell 32 surrounding the outer periphery of the inner cell 31, and an outer cell 33 surrounding the outer periphery of the middle cell 32.
  • the inner cell 31 and the outer cell 33 are made of a metal such as an aluminum alloy, for example.
  • the middle cell 32 is made of resin, for example.
  • a space is formed between the inner peripheral surface 31 ⁇ / b> B of the inner cell 31 and the outer peripheral surface 13 of the lens 10.
  • the inner peripheral surface 31B of the inner cell 31 and the outer peripheral surface of the lens 10 are formed. 13 is in contact. Further, the inner cell 31 is formed with a protruding portion 31A that protrudes toward the inner peripheral side. The protrusion 31A of the inner cell 31 and the outer edge region 12B of the second lens surface 12 are in contact with each other.
  • the cap 20 has a cylindrical shape.
  • the cap 20 is made of a metal such as an aluminum alloy.
  • the cap 20 contacts the outer edge region 11B of the first lens surface 11 at one end surface. Further, a gap is formed between the outer peripheral side of the region in contact with the outer edge region 11B in the cap 20 and the outer edge region 11B. Further, the cap 20 is fixed to the barrel main body 30 in a state where the cap 20 is fitted to the end of the barrel main body 30 in a region on the outer peripheral side of a region where a gap is formed between the outer edge region 11B and the cap 20. Yes. In this way, the lens 10 is held by the lens barrel 50.
  • a heater 61 that adjusts the temperature of the lens 10 is fixed to the outer peripheral surface 13 of the lens 10.
  • the heater 61 is installed outside the lens module 1, and the temperature of the lens 10 is not adjusted from the outside, but the temperature of the lens 10 is adjusted (heated) by the heater 61 fixed to the lens 10. It is easy to adjust to a desired temperature.
  • a gap is formed between the lens 10 and the lens barrel 50 (inner cell 31). Thereby, heat conduction with the inner cell 31 is suppressed, and the adjustment of the temperature of the lens 10 is further facilitated.
  • the lens module 1 of the present embodiment is an infrared lens module in which the temperature of the lens 10 can be easily adjusted.
  • the inner cell 31 may consist of resin.
  • a resin having a thermal conductivity smaller than that of a metal as a material constituting the inner cell 31 in contact with the lens 10 heat conduction with the inner cell 31 is suppressed, and the temperature of the lens 10 is further adjusted. It becomes easy.
  • FIG. 3 is a schematic cross-sectional view showing a cross section including the optical axis of the lens module according to the third embodiment.
  • the lens module 1 according to the third embodiment includes a lens 10, a lens barrel 50, and a heater 61.
  • the lens 10 is an infrared lens that transmits infrared light, more specifically, light having a wavelength of 8 ⁇ m to 14 ⁇ m.
  • the material constituting the lens 10 is, for example, ZnS.
  • the lens 10 includes a first lens surface 11, a second lens surface 12, and an outer peripheral surface 13.
  • the first lens surface 11 includes a central region 11A that is a convex surface that is located at the center and intersects the optical axis C, and an outer edge region 11B that is a plane surrounding the central region 11A.
  • the second lens surface 12 includes a central region 12A that is a concave surface that is located at the center and intersects the optical axis C, and an outer edge region 12B that is a plane surrounding the central region 12A.
  • the lens barrel 50 includes a cap 20 and a lens barrel body 30.
  • the lens barrel body 30 has a cylindrical shape.
  • the lens barrel body 30 supports the lens 10 by contacting the outer edge region 12B and the outer peripheral surface 13 of the second lens surface 12 at the end.
  • the cap 20 is cylindrical and has a shape in which a projecting portion 21 projecting radially inward is formed at one end.
  • the cap 20 is made of a metal such as an aluminum alloy.
  • the inner peripheral surface 22 of the cap 20 and the outer peripheral surface 13 of the lens 10 are in contact with each other. Further, the protruding portion 21 of the cap 20 and the outer edge region 11B of the first lens surface 11 are in contact with each other.
  • the cap 20 is disposed on one end side of the barrel main body 30.
  • the cap 20 is fixed in contact with the lens barrel body 30 at the end opposite to the side on which the protruding portion 21 is formed. In this way, the lens 10 is held between the lens barrel body 30 and the cap 20 and held by the lens barrel 50.
  • An annular groove 23 is formed in the cap 20 so as to enter the axial direction from the end surface opposite to the side on which the protruding portion 21 is formed.
  • a heater 61 that adjusts the temperature of the lens 10 is installed inside the groove 23.
  • the heater 61 is fixed in contact with the side wall of the groove 23.
  • the heater 61 is disposed so as to extend along the circumferential direction of the annular groove 23.
  • the heater 61 may be disposed so as to contact the side wall of the groove 23 over the entire circumference.
  • a wiring 62 is connected to the heater 61.
  • the wiring 62 is connected to a power source (not shown).
  • a heater 61 driven by electric power supplied from the power source via the wiring 62 adjusts the temperature of the lens 10 by heating the lens 10.
  • the heater 61 is, for example, a film heater.
  • a heater 61 that adjusts the temperature of the lens 10 is fixed in the groove 23 formed in the cap 20. Rather than installing the heater 61 outside the lens module 1 and adjusting the temperature of the lens 10 from the outside, the temperature of the lens 10 is adjusted (heated) by the heater 61 fixed to the cap 20. It is easy to adjust to a desired temperature.
  • the region of the lens barrel body 30 that contacts the lens 10 is preferably made of a material having a lower thermal conductivity than the region of the cap 20 that contacts the lens 10.
  • the cap 20 is made of a metal, specifically, an aluminum alloy
  • the lens barrel body 30 is made of a resin that is a material having a lower thermal conductivity than the metal constituting the cap 20.
  • the emissivity of the surface of the cap 20 other than the surface exposed to the outside is preferably 0.7 or less.
  • a black alumite layer is formed on the inner peripheral surface 26 of the protruding portion 21, the end surface 25 on the protruding portion 21 side, and the outer peripheral surface 24, which are the surfaces exposed to the outside.
  • the black alumite layer can be formed by introducing a black dye into the pores of the alumite layer (oxidized layer) formed by the alumite treatment after the alumite treatment (anodic oxidation treatment). By forming the black alumite layer, the emissivity of these surfaces, which are surfaces exposed to the outside, exceeds 0.7.
  • the black alumite layer is formed on at least a part of the lens holding surface 27 and at least a part of the inner peripheral surface 22 which are surfaces that contact the lens 10 of the protruding portion 21 that is a surface other than the surface exposed to the outside in the cap 20. Not formed.
  • a metal such as an aluminum alloy that is a material constituting the cap 20 may be exposed, or from the black alumite layer.
  • the surface treatment layer having a low emissivity may be exposed.
  • the emissivities of the lens holding surface 27 and the inner peripheral surface 22 which are surfaces of the protruding portion 21 that are in contact with the lens 10 are 0.7 or less.
  • the emissivity is preferably 0.5 or less, and more preferably 0.3 or less.
  • FIG. 4 is a schematic cross-sectional view showing a cross section including the optical axis of the lens module in the fourth embodiment.
  • lens module 1 in the fourth embodiment basically has the same configuration as in the third embodiment, and has the same effects.
  • the lens module 1 according to the fourth embodiment is different from the third embodiment in the structure of the lens barrel body 30.
  • the lens barrel body 30 of the fourth embodiment includes a protruding portion 34 that protrudes radially outward from an end portion on the side facing the cap 20.
  • Projection 34 covers the opening of groove 23 in the third embodiment (see FIGS. 3 and 4).
  • the annular space 28 is formed by the groove 23 and the protrusion 34.
  • the heater 61 is installed in the annular space 28. Rather than installing the heater 61 outside the lens module 1 and adjusting the temperature of the lens 10 from the outside, the temperature of the lens 10 is adjusted (heated) by the heater 61 installed in the cap 20 in this manner. This makes it easy to adjust the lens 10 to a desired temperature.
  • the protrusion 34 since the protrusion 34 is formed, it is possible to prevent the heater 61 from dropping off.
  • FIG. 5 is a schematic cross-sectional view showing a cross section including the optical axis of the lens module according to the fifth embodiment.
  • lens module 1 in the fifth embodiment basically has the same configuration as that in the third embodiment and has the same effects.
  • the lens module 1 according to the fifth embodiment is different from the third embodiment in the structure of the cap 20.
  • cap 20 of the fifth embodiment includes a holding member 29A.
  • a protruding portion that protrudes radially outward is formed at the end of the main body portion of the cap 20 opposite to the lens barrel main body 30.
  • a holding member 29A having a hollow cylindrical shape and having a protruding portion that protrudes radially inward at the end on the lens barrel main body 30 side is disposed.
  • an annular space 28 is formed between the main body portion of the cap 20 and the holding member 29A.
  • the heater 61 is installed in the annular space 28. The heater 61 is supported from the outer peripheral side by the holding member 29A.
  • the holding member 29A may be made of a metal such as an aluminum alloy, or may be made of a resin. By adopting a metal as the material constituting the holding member 29A, high durability can be obtained. By adopting a resin having a low thermal conductivity as a material constituting the holding member 29A, it is easy to suppress heat dissipation from the cap 20 and adjust the lens 10 to a desired temperature.
  • FIG. 6 is a schematic cross-sectional view showing a cross section including the optical axis of the lens module in the sixth embodiment.
  • lens module 1 in the sixth embodiment has basically the same configuration as in the fifth embodiment, and has the same effects.
  • the lens module 1 of the sixth embodiment is different from that of the fifth embodiment in the structure of the lens barrel body 30 and the cap 20 (holding member 29A).
  • the lens barrel body 30 of the sixth embodiment includes a protruding portion 34 that protrudes radially outward from an end portion on the side facing the cap 20.
  • the holding member 29A is not formed with a protruding portion as in the fifth embodiment, and the holding member 29A has a hollow cylindrical shape. Thereby, an annular space 28 is formed between the main body portion of the cap 20 and the holding member 29A.
  • the heater 61 is installed in the annular space 28. The heater 61 is supported from the outer peripheral side by the holding member 29A.
  • the heater 61 is installed outside the lens module 1 and the temperature of the lens 10 is not adjusted from the outside, but the temperature of the lens 10 is adjusted (heated) by the heater 61 installed in the cap 20 in this manner. This makes it easy to adjust the lens 10 to a desired temperature.
  • FIG. 7 is a schematic cross-sectional view showing a cross section including the optical axis of the lens module according to the seventh embodiment. 7 and 3, the lens module 1 according to the seventh embodiment has basically the same configuration as that of the third embodiment and has the same effects. However, the lens module 1 according to the seventh embodiment is different from the third embodiment in the structure of the cap 20.
  • the cap 20 of the seventh embodiment includes a holding member 29B.
  • a groove is formed on the inner peripheral surface of the cap 20, and a holding member 29B having a hollow cylindrical shape is disposed so as to cover the opening of the groove.
  • an annular space 28 is formed between the main body portion of the cap 20 and the holding member 29B.
  • the heater 61 is installed in the annular space 28.
  • the heater 61 is supported from the inner peripheral side by the holding member 29B. Rather than installing the heater 61 outside the lens module 1 and adjusting the temperature of the lens 10 from the outside, the temperature of the lens 10 is adjusted (heated) by the heater 61 installed in the cap 20 in this manner. This makes it easy to adjust the lens 10 to a desired temperature.
  • the holding member 29B may be made of a metal such as an aluminum alloy.
  • FIG. 8 is a schematic sectional view showing a section including the optical axis of the lens module according to the eighth embodiment.
  • the lens module 1 according to the eighth embodiment basically has the same configuration as that of the seventh embodiment and has the same effects.
  • the lens module 1 of the eighth embodiment is different from that of the seventh embodiment in the structure of the lens barrel body 30 and the cap 20.
  • the lens barrel body 30 of the eighth embodiment includes a protruding portion 34 that protrudes radially outward from an end portion on the side facing the cap 20.
  • the cap 20 is not formed with a wall on the lens barrel body 30 side of the groove as in the seventh embodiment.
  • the holding member 29B has a hollow cylindrical shape as in the case of the seventh embodiment. Thereby, an annular space 28 surrounded by the main body portion of the cap 20, the holding member 29 ⁇ / b> B, and the protruding portion 34 of the lens barrel main body 30 is formed.
  • the heater 61 is installed in the annular space 28. The heater 61 is supported from the inner peripheral side by the holding member 29B.
  • the temperature of the lens 10 is adjusted (heated) by the heater 61 installed in the cap 20 in this manner. This makes it easy to adjust the lens 10 to a desired temperature.
  • FIG. 9 is a schematic sectional view showing a section including the optical axis of the lens module according to the ninth embodiment.
  • the lens module 1 according to the ninth embodiment basically has the same configuration as that of the first embodiment and has the same effects.
  • the lens module 1 according to the ninth embodiment is different from the first embodiment in the arrangement of the heater 61.
  • the heater 61 of the ninth embodiment is installed on the inner peripheral surface 22 of the cap 20. Rather than installing the heater 61 outside the lens module 1 and adjusting the temperature of the lens 10 from the outside, the temperature of the lens 10 is adjusted (heated) by the heater 61 installed in the cap 20 in this manner. This makes it easy to adjust the lens 10 to a desired temperature.
  • FIG. 10 is a schematic cross-sectional view showing a cross section including the optical axis of the lens module according to the tenth embodiment.
  • lens module 1 in the tenth embodiment has basically the same configuration as in the ninth embodiment and has the same effects.
  • the lens module 1 of the tenth embodiment differs from the ninth embodiment in the arrangement of the heater 61.
  • heater 61 of the tenth embodiment is installed on the surface facing annular space 28 in protrusion 21 of cap 20 (the surface opposite to outer edge region 11 ⁇ / b> B as viewed from annular space 28). ing. Rather than installing the heater 61 outside the lens module 1 and adjusting the temperature of the lens 10 from the outside, the temperature of the lens 10 is adjusted (heated) by the heater 61 installed in the cap 20 in this manner. This makes it easy to adjust the lens 10 to a desired temperature.
  • FIG. 11 is a schematic sectional view showing a section including the optical axis of the lens module according to the eleventh embodiment.
  • lens module 1 according to the eleventh embodiment has basically the same configuration as that of the third embodiment and has the same effects.
  • the lens module 1 according to the seventh embodiment is different from the third embodiment in the structure of the cap 20.
  • the cap 20 of the eleventh embodiment includes a holding member 29C.
  • the groove portion 23 is not formed in the cap 20.
  • An annular holding member 29 ⁇ / b> C having an annular groove that opens toward the end surface is disposed on the end surface of the main body of the cap 20 opposite to the lens barrel body 30.
  • the holding member 29C is disposed so that the opening of the groove of the holding member 29C is covered by the main body portion of the cap 20.
  • an annular space 28 is formed between the main body portion of the cap 20 and the holding member 29C.
  • the heater 61 is installed in the annular space 28.
  • the holding member 29C may be made of a metal such as an aluminum alloy, or may be made of a resin. By adopting a metal as a material constituting the holding member 29C, high durability can be obtained. By adopting a resin having a low thermal conductivity as a material constituting the holding member 29C, it is easy to suppress heat dissipation from the cap 20 and adjust the lens 10 to a desired temperature.
  • the temperature adjustment device that can be employed is not limited to this, and for example, a thin heater such as a rubber heater or a seat heater.
  • a planar heater or a linear heater may be used. 1 to 11, only one lens 10 is illustrated, but another lens may be present behind the lens 10 (side facing the second lens surface 12).
  • the heater 61 as a temperature adjusting device is disposed (fixed) on the outer peripheral surface 13 of the lens.
  • the temperature adjusting device May be arranged (fixed) in the outer edge region (outer edge region 11B, outer edge region 12B) of the lens surface.
  • 1 lens module 10 lens, 11 first lens surface, 11A central region, 11B outer edge region, 12 second lens surface, 12A central region, 12B outer edge region, 13 outer peripheral surface, 20 cap, 21 protruding portion, 22 inner peripheral surface , 23 groove portion, 24 outer peripheral surface, 25 end surface, 26 inner peripheral surface, 27 lens holding surface, 28 annular space, 29A holding member, 29B holding member, 29C holding member, 30 lens barrel body, 31 inner cell, 31A protruding portion, 31B inner peripheral surface, 32 middle cell, 33 outer cell, 34 protrusion, 50 lens barrel, 61 heater, 62 wiring.

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
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Abstract

Provided is an infrared lens module provided with: a lens that transmits infrared rays; a lens barrel for holding the lens; and a temperature adjustment device for adjusting the temperature of the lens, the temperature adjustment device being disposed in the lens.

Description

赤外線レンズモジュールInfrared lens module
　本発明は赤外線レンズモジュールに関するものである。 The present invention relates to an infrared lens module.
　本出願は、２０１６年３月１５日出願の日本出願第２０１６－０５１６８０号および２０１６年７月１日出願の日本出願第２０１６－１３１６４５号に基づく優先権を主張し、前記日本出願に記載された全ての記載内容を援用するものである。 The present application claims priority based on Japanese Application No. 2016-051680 filed on Mar. 15, 2016 and Japanese Application No. 2016-131645 filed on Jul. 1, 2016, and is described in the aforementioned Japanese application. All the descriptions are incorporated.
　赤外線カメラが低温環境下で使用される場合の対応策として、赤外線カメラを、赤外線を透過する窓を有するケース内に格納し、窓をヒータにより加熱することで、結露や凍結を防止する構造が提案されている（たとえば、特開２００１－５７６４２号公報（特許文献１）参照）。 As a countermeasure when the infrared camera is used in a low temperature environment, the infrared camera is stored in a case having a window that transmits infrared rays, and the window is heated by a heater to prevent condensation and freezing. It has been proposed (see, for example, Japanese Patent Laid-Open No. 2001-57642 (Patent Document 1)).
特開２００１－５７６４２号公報JP 2001-57642 A
　本発明に従った赤外線レンズモジュールは、赤外線を透過するレンズと、レンズを保持する鏡筒と、レンズに配置され、レンズの温度を調整する温度調整装置と、を備える。 The infrared lens module according to the present invention includes a lens that transmits infrared rays, a lens barrel that holds the lens, and a temperature adjusting device that is disposed on the lens and adjusts the temperature of the lens.
実施の形態１における赤外線レンズモジュールの構造を示す概略断面図である。2 is a schematic cross-sectional view showing a structure of an infrared lens module according to Embodiment 1. FIG. 実施の形態２における赤外線レンズモジュールの構造を示す概略断面図である。6 is a schematic cross-sectional view showing a structure of an infrared lens module according to Embodiment 2. FIG. 実施の形態３における赤外線レンズモジュールの構造を示す概略断面図である。6 is a schematic cross-sectional view showing a structure of an infrared lens module according to Embodiment 3. FIG. 実施の形態４における赤外線レンズモジュールの構造を示す概略断面図である。6 is a schematic cross-sectional view showing a structure of an infrared lens module according to Embodiment 4. FIG. 実施の形態５における赤外線レンズモジュールの構造を示す概略断面図である。FIG. 10 is a schematic cross-sectional view showing the structure of an infrared lens module in a fifth embodiment. 実施の形態６における赤外線レンズモジュールの構造を示す概略断面図である。FIG. 10 is a schematic cross-sectional view showing the structure of an infrared lens module in a sixth embodiment. 実施の形態７における赤外線レンズモジュールの構造を示す概略断面図である。FIG. 10 is a schematic cross-sectional view showing the structure of an infrared lens module in a seventh embodiment. 実施の形態８における赤外線レンズモジュールの構造を示す概略断面図である。FIG. 10 is a schematic cross-sectional view showing the structure of an infrared lens module in an eighth embodiment. 実施の形態９における赤外線レンズモジュールの構造を示す概略断面図である。FIG. 10 is a schematic cross-sectional view showing the structure of an infrared lens module in a ninth embodiment. 実施の形態１０における赤外線レンズモジュールの構造を示す概略断面図である。FIG. 10 is a schematic cross-sectional view showing the structure of an infrared lens module in a tenth embodiment. 実施の形態１１における赤外線レンズモジュールの構造を示す概略断面図である。FIG. 22 is a schematic cross-sectional view showing the structure of an infrared lens module in an eleventh embodiment.
　［本開示が解決しようとする課題］
　特許文献１に開示された構造は、赤外線レンズの温度を調整するものではなく、ケースの窓の温度を調整するものである。そのため、赤外線を透過する窓を有するケースが必須となり、装置が大型化するとともに、コストも上昇する。そこで、赤外線レンズの温度の調整が容易な赤外線レンズモジュールを提供することを目的の１つとする。 [Problems to be solved by the present disclosure]
The structure disclosed in Patent Document 1 does not adjust the temperature of the infrared lens, but adjusts the temperature of the window of the case. For this reason, a case having a window that transmits infrared rays is indispensable, which increases the size of the device and increases the cost. Therefore, an object is to provide an infrared lens module in which the temperature of the infrared lens can be easily adjusted.
　［本開示の効果］
　本開示の赤外線レンズモジュールによれば、赤外線レンズの温度の調整が容易な赤外線レンズモジュールを提供することができる。 [Effects of the present disclosure]
According to the infrared lens module of the present disclosure, an infrared lens module in which the temperature of the infrared lens can be easily adjusted can be provided.
　［本願発明の実施形態の説明］
　最初に本願発明の実施態様を列記して説明する。本願の第１の局面における赤外線レンズモジュールは、赤外線を透過するレンズと、レンズを保持する鏡筒と、レンズに配置され、レンズの温度を調整する温度調整装置と、を備える。 [Description of Embodiment of Present Invention]
First, embodiments of the present invention will be listed and described. An infrared lens module according to a first aspect of the present application includes a lens that transmits infrared rays, a lens barrel that holds the lens, and a temperature adjustment device that is disposed in the lens and adjusts the temperature of the lens.
　本願の第１の局面における赤外線レンズモジュールにおいては、レンズの温度を調整する温度調整装置がレンズに配置される。温度調整装置を赤外線レンズモジュールの外部に設置し、外部からレンズの温度を調整するのではなく、レンズに配置された温度調整装置によりレンズの温度を調整することで、レンズを所望の温度に調整することが容易となる。このように、本願の赤外線レンズモジュールによれば、赤外線レンズの温度の調整が容易な赤外線レンズモジュールを提供することができる。 In the infrared lens module according to the first aspect of the present application, a temperature adjusting device that adjusts the temperature of the lens is arranged in the lens. The temperature adjustment device is installed outside the infrared lens module, and the lens temperature is adjusted by the temperature adjustment device placed on the lens, rather than adjusting the lens temperature from the outside. Easy to do. Thus, according to the infrared lens module of the present application, an infrared lens module in which the temperature of the infrared lens can be easily adjusted can be provided.
　上記第１の局面における赤外線レンズモジュールにおいて、レンズと鏡筒との間には間隔が形成されていてもよい。このようにすることにより、鏡筒との間の熱伝導が抑制され、赤外線レンズの温度の調整が一層容易となる。 In the infrared lens module according to the first aspect, an interval may be formed between the lens and the lens barrel. By doing so, heat conduction with the lens barrel is suppressed, and the temperature of the infrared lens can be adjusted more easily.
　上記第１の局面における赤外線レンズモジュールにおいて、温度調整装置は、レンズの外周面およびレンズ面の外縁領域の少なくともいずれか一方に配置されてもよい。このようにすることにより、温度調整装置を容易に設置することができる。 In the infrared lens module according to the first aspect, the temperature adjusting device may be disposed on at least one of the outer peripheral surface of the lens and the outer edge region of the lens surface. By doing in this way, a temperature control apparatus can be installed easily.
　上記第１の局面における赤外線レンズモジュールにおいて、レンズを構成する材料は硫化亜鉛（ＺｎＳ）であってもよい。ＺｎＳから構成されるレンズは、温度変化に対する屈折率の変化が小さい。そのため、ＺｎＳから構成されるレンズを本願のレンズモジュールに採用することで、レンズの焦点位置を所望の範囲とすることが容易となる。 In the infrared lens module according to the first aspect, the material constituting the lens may be zinc sulfide (ZnS). A lens composed of ZnS has a small change in refractive index with respect to a temperature change. Therefore, by adopting a lens composed of ZnS in the lens module of the present application, it becomes easy to set the focal position of the lens within a desired range.
　本願の第２の局面における赤外線レンズモジュールは、赤外線を透過するレンズと、レンズを保持する鏡筒と、を備える。鏡筒は、鏡筒本体と、鏡筒本体の一方の端部側に配置されるキャップと、を含む。レンズは、鏡筒本体とキャップとに挟まれて保持される。キャップには、レンズの温度を調整するヒータが設置される。 The infrared lens module according to the second aspect of the present application includes a lens that transmits infrared rays and a lens barrel that holds the lens. The lens barrel includes a lens barrel body and a cap disposed on one end side of the lens barrel body. The lens is held between the lens barrel body and the cap. A heater for adjusting the temperature of the lens is installed in the cap.
　本願の第２の局面における赤外線モジュールにおいては、レンズを保持するキャップにヒータが設置される。赤外線レンズモジュールの外部からレンズの温度を調整するのではなく、キャップに設置されたヒータによりレンズの温度を調整することで、レンズを所望の温度に調整することが容易となる。このように、本願の赤外線レンズモジュールによれば、レンズの温度の調整が容易な赤外線レンズモジュールを提供することができる。 In the infrared module according to the second aspect of the present application, a heater is installed on the cap that holds the lens. Rather than adjusting the temperature of the lens from the outside of the infrared lens module, adjusting the temperature of the lens with a heater installed in the cap makes it easy to adjust the lens to a desired temperature. Thus, according to the infrared lens module of the present application, it is possible to provide an infrared lens module in which the lens temperature can be easily adjusted.
　上記第２の局面における赤外線レンズモジュールにおいて、鏡筒本体のレンズに接触する領域は、キャップのレンズに接触する領域よりも熱伝導率が小さい材料からなっていてもよい。このようにすることにより、鏡筒本体との間の熱伝導が抑制され、レンズの温度の調整が一層容易となる。 In the infrared lens module according to the second aspect, the region in contact with the lens of the lens barrel body may be made of a material having a lower thermal conductivity than the region in contact with the lens of the cap. By doing so, heat conduction with the lens barrel body is suppressed, and adjustment of the lens temperature becomes easier.
　上記第２の局面における赤外線レンズモジュールにおいて、キャップの、外部に露出する面以外の面の放射率は０．７以下であってもよい。このようにすることにより、キャップからの放熱量が低減され、レンズの温度の調整が一層容易となる。レンズの温度の調整をさらに容易にする観点から、上記放射率は０．５以下であることが好ましく、０．３以下であることがより好ましい。 In the infrared lens module according to the second aspect, the emissivity of the surface of the cap other than the surface exposed to the outside may be 0.7 or less. By doing so, the amount of heat released from the cap is reduced, and the adjustment of the lens temperature is further facilitated. From the viewpoint of further facilitating adjustment of the lens temperature, the emissivity is preferably 0.5 or less, and more preferably 0.3 or less.
　上記第２の局面における赤外線レンズモジュールにおいて、レンズを構成する材料は硫化亜鉛であってもよい。ＺｎＳから構成されるレンズは、温度変化に対する屈折率の変化が小さい。そのため、ＺｎＳから構成されるレンズを本願のレンズモジュールに採用することで、レンズの焦点位置を所望の範囲とすることが容易となる。 In the infrared lens module according to the second aspect, the material constituting the lens may be zinc sulfide. A lens composed of ZnS has a small change in refractive index with respect to a temperature change. Therefore, by adopting a lens composed of ZnS in the lens module of the present application, it becomes easy to set the focal position of the lens within a desired range.
　［本願発明の実施形態の詳細］
　次に、本発明にかかる赤外線レンズモジュールの一実施の形態を、以下に図面を参照しつつ説明する。なお、以下の図面において同一または相当する部分には同一の参照番号を付しその説明は繰返さない。 [Details of the embodiment of the present invention]
Next, an embodiment of an infrared lens module according to the present invention will be described below with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.
　（実施の形態１）
　図１は、実施の形態１におけるレンズモジュールの、光軸を含む断面を示す概略断面図である。図１を参照して、実施の形態１におけるレンズモジュール１は、レンズ１０と、鏡筒５０と、ヒータ６１とを備える。 (Embodiment 1)
1 is a schematic cross-sectional view showing a cross section including the optical axis of the lens module according to Embodiment 1. FIG. Referring to FIG. 1, the lens module 1 according to the first embodiment includes a lens 10, a lens barrel 50, and a heater 61.
　レンズ１０は、赤外線、より具体的には波長８μｍ以上１４μｍ以下の光を透過する赤外線レンズである。レンズ１０を構成する材料は、たとえばＺｎＳである。レンズ１０は、第１レンズ面１１と、第２レンズ面１２と、外周面１３とを含む。第１レンズ面１１は、中央に位置し、光軸Ｃと交差する凸面である中央領域１１Ａと、中央領域１１Ａを取り囲む平面である外縁領域１１Ｂとを含む。第２レンズ面１２は、中央に位置し、光軸Ｃと交差する凹面である中央領域１２Ａと、中央領域１２Ａを取り囲む平面である外縁領域１２Ｂとを含む。 The lens 10 is an infrared lens that transmits infrared light, more specifically, light having a wavelength of 8 μm to 14 μm. The material constituting the lens 10 is, for example, ZnS. The lens 10 includes a first lens surface 11, a second lens surface 12, and an outer peripheral surface 13. The first lens surface 11 includes a central region 11A that is a convex surface that is located at the center and intersects the optical axis C, and an outer edge region 11B that is a plane surrounding the central region 11A. The second lens surface 12 includes a central region 12A that is a concave surface that is located at the center and intersects the optical axis C, and an outer edge region 12B that is a plane surrounding the central region 12A.
　鏡筒５０は、キャップ２０と、鏡筒本体３０とを含む。鏡筒本体３０は、円筒状の形状を有する。鏡筒本体３０は、端部において第２レンズ面１２の外縁領域１２Ｂおよび外周面１３に接触してレンズ１０を支持する。本実施の形態において、鏡筒本体３０は樹脂またはアルミニウム合金などの金属からなっている。 The lens barrel 50 includes a cap 20 and a lens barrel body 30. The lens barrel body 30 has a cylindrical shape. The lens barrel body 30 supports the lens 10 by contacting the outer edge region 12B and the outer peripheral surface 13 of the second lens surface 12 at the end. In the present embodiment, the lens barrel body 30 is made of a metal such as a resin or an aluminum alloy.
　キャップ２０は、円筒状であって一方の端部に径方向内周側に突出する突出部２１が形成された形状を有する。キャップ２０は、アルミニウム合金などの金属からなっている。キャップ２０の内周面２２とレンズ１０の外周面１３との間には、間隔が形成されている。また、キャップ２０の突出部２１と第１レンズ面１１の外縁領域１１Ｂとが接触する。さらに、突出部２１において外縁領域１１Ｂに接触する領域の外周側と外縁領域１１Ｂとの間には隙間が形成されている。さらに、突出部２１が形成された側とは反対側の端部において鏡筒本体３０の端部と嵌め合う状態で、キャップ２０は鏡筒本体３０に対して固定されている。このようにして、レンズ１０は鏡筒５０に保持される。 The cap 20 is cylindrical and has a shape in which a projecting portion 21 projecting radially inward is formed at one end. The cap 20 is made of a metal such as an aluminum alloy. A gap is formed between the inner peripheral surface 22 of the cap 20 and the outer peripheral surface 13 of the lens 10. Further, the protruding portion 21 of the cap 20 and the outer edge region 11B of the first lens surface 11 are in contact with each other. Further, a gap is formed between the outer peripheral side of the region in contact with the outer edge region 11B in the protruding portion 21 and the outer edge region 11B. Further, the cap 20 is fixed to the barrel main body 30 in a state where the end of the barrel main body 30 is fitted to the end opposite to the side on which the protruding portion 21 is formed. In this way, the lens 10 is held by the lens barrel 50.
　レンズ１０の温度を調整する温度調整装置としてのヒータ６１は、レンズ１０の外周面１３に固定される。レンズ１０の外周面１３とキャップ２０の内周面２２との間に形成される間隔の内部に、ヒータ６１が配置される。ヒータ６１は、レンズ１０の外周面１３に周方向に沿って延在するように配置される。ヒータ６１は、外周面１３に全周にわたって接触するように配置されてもよい。ヒータ６１には、配線６２が接続されている。そして、配線６２は、電源（図示しない）に接続されている。電源から配線６２を介して供給される電力によって駆動されるヒータ６１は、レンズ１０を加熱することによりレンズ１０の温度を調整する。ヒータ６１は、たとえばフィルムヒータである。 The heater 61 as a temperature adjusting device for adjusting the temperature of the lens 10 is fixed to the outer peripheral surface 13 of the lens 10. A heater 61 is disposed inside a gap formed between the outer peripheral surface 13 of the lens 10 and the inner peripheral surface 22 of the cap 20. The heater 61 is disposed on the outer peripheral surface 13 of the lens 10 so as to extend along the circumferential direction. The heater 61 may be disposed so as to contact the outer peripheral surface 13 over the entire circumference. A wiring 62 is connected to the heater 61. The wiring 62 is connected to a power source (not shown). A heater 61 driven by electric power supplied from the power source via the wiring 62 adjusts the temperature of the lens 10 by heating the lens 10. The heater 61 is, for example, a film heater.
　本実施の形態の赤外線レンズモジュールであるレンズモジュール１においては、レンズ１０の温度を調整するヒータ６１がレンズ１０の外周面１３に固定される。ヒータ６１をレンズモジュール１の外部に設置し、外部からレンズ１０の温度を調整するのではなく、レンズ１０に固定されたヒータ６１によりレンズ１０の温度を調整（加熱）することで、レンズ１０を所望の温度に調整することが容易となっている。さらに、本実施の形態においては、レンズ１０と鏡筒５０（キャップ２０）との間に間隔が形成されている。これにより、キャップ２０との間の熱伝導が抑制され、レンズ１０の温度の調整が一層容易となっている。このように、本実施の形態のレンズモジュール１は、レンズ１０の温度の調整が容易な赤外線レンズモジュールとなっている。また、レンズ１０に接触する鏡筒本体３０は樹脂からなるものとすることができる。金属に比べて熱伝導率の小さい樹脂をレンズ１０に接触する鏡筒本体３０を構成する材料として採用することにより、鏡筒本体３０との間の熱伝導が抑制され、レンズ１０の温度の調整が一層容易となる。 In the lens module 1 that is the infrared lens module of the present embodiment, a heater 61 that adjusts the temperature of the lens 10 is fixed to the outer peripheral surface 13 of the lens 10. The heater 61 is installed outside the lens module 1, and the temperature of the lens 10 is not adjusted from the outside, but the temperature of the lens 10 is adjusted (heated) by the heater 61 fixed to the lens 10. It is easy to adjust to a desired temperature. Further, in the present embodiment, a gap is formed between the lens 10 and the lens barrel 50 (cap 20). Thereby, heat conduction with the cap 20 is suppressed, and adjustment of the temperature of the lens 10 is further facilitated. Thus, the lens module 1 of the present embodiment is an infrared lens module in which the temperature of the lens 10 can be easily adjusted. The lens barrel body 30 that contacts the lens 10 can be made of resin. By adopting a resin having a thermal conductivity smaller than that of a metal as a material constituting the lens barrel body 30 in contact with the lens 10, heat conduction with the lens barrel body 30 is suppressed, and the temperature of the lens 10 is adjusted. Is even easier.
　（実施の形態２）
　次に、他の実施の形態である実施の形態２について説明する。図２は、実施の形態２におけるレンズモジュールの、光軸を含む断面を示す概略断面図である。 (Embodiment 2)
Next, a second embodiment which is another embodiment will be described. FIG. 2 is a schematic cross-sectional view showing a cross section including the optical axis of the lens module according to the second embodiment.
　図２を参照して、実施の形態２におけるレンズモジュール１は、レンズ１０と、鏡筒５０と、ヒータ６１とを備える。 Referring to FIG. 2, the lens module 1 according to the second embodiment includes a lens 10, a lens barrel 50, and a heater 61.
　レンズ１０は、赤外線を透過する赤外線レンズである。レンズ１０を構成する材料は、たとえばＺｎＳである。レンズ１０は、第１レンズ面１１と、第２レンズ面１２と、外周面１３とを含む。第１レンズ面１１は、中央に位置し、光軸Ｃと交差する凹面である中央領域１１Ａと、中央領域１１Ａを取り囲む平面である外縁領域１１Ｂとを含む。第２レンズ面１２は、中央に位置し、光軸Ｃと交差する凸面である中央領域１２Ａと、中央領域１２Ａを取り囲む平面である外縁領域１２Ｂとを含む。 The lens 10 is an infrared lens that transmits infrared rays. The material constituting the lens 10 is, for example, ZnS. The lens 10 includes a first lens surface 11, a second lens surface 12, and an outer peripheral surface 13. The first lens surface 11 includes a central region 11A that is a concave surface that is located at the center and intersects the optical axis C, and an outer edge region 11B that is a plane surrounding the central region 11A. The second lens surface 12 includes a central region 12A that is a convex surface that is located at the center and intersects the optical axis C, and an outer edge region 12B that is a plane surrounding the central region 12A.
　鏡筒５０は、キャップ２０と、鏡筒本体３０とを含む。鏡筒本体３０は、円筒状の形状を有する。鏡筒本体３０は、円筒状の内セル３１と、内セル３１の外周を取り囲む中セル３２と、中セル３２の外周を取り囲む外セル３３とを含む。内セル３１および外セル３３は、たとえばアルミニウム合金などの金属からなる。中セル３２は、たとえば樹脂からなる。内セル３１の内周面３１Ｂとレンズ１０の外周面１３との間には、間隔が形成されている。レンズ１０の外周面１３において内セル３１の内周面３１Ｂとの間に間隔が形成される領域の第２レンズ面１２側の領域において、内セル３１の内周面３１Ｂとレンズ１０の外周面１３とが接触している。また、内セル３１には、内周側に突出する突出部３１Ａが形成されている。内セル３１の突出部３１Ａと第２レンズ面１２の外縁領域１２Ｂとが接触する。 The lens barrel 50 includes a cap 20 and a lens barrel body 30. The lens barrel body 30 has a cylindrical shape. The lens barrel body 30 includes a cylindrical inner cell 31, a middle cell 32 surrounding the outer periphery of the inner cell 31, and an outer cell 33 surrounding the outer periphery of the middle cell 32. The inner cell 31 and the outer cell 33 are made of a metal such as an aluminum alloy, for example. The middle cell 32 is made of resin, for example. A space is formed between the inner peripheral surface 31 </ b> B of the inner cell 31 and the outer peripheral surface 13 of the lens 10. In the region on the second lens surface 12 side of the region formed between the outer peripheral surface 13 of the lens 10 and the inner peripheral surface 31B of the inner cell 31, the inner peripheral surface 31B of the inner cell 31 and the outer peripheral surface of the lens 10 are formed. 13 is in contact. Further, the inner cell 31 is formed with a protruding portion 31A that protrudes toward the inner peripheral side. The protrusion 31A of the inner cell 31 and the outer edge region 12B of the second lens surface 12 are in contact with each other.
　キャップ２０は、円筒状の形状を有する。キャップ２０は、アルミニウム合金などの金属からなっている。キャップ２０は、一方の端面において第１レンズ面１１の外縁領域１１Ｂに接触する。さらに、キャップ２０において外縁領域１１Ｂに接触する領域の外周側と外縁領域１１Ｂとの間には隙間が形成されている。さらに、キャップ２０において外縁領域１１Ｂとの間に隙間が形成される領域の外周側の領域において鏡筒本体３０の端部と嵌め合う状態で、キャップ２０は鏡筒本体３０に対して固定されている。このようにして、レンズ１０は鏡筒５０に保持される。 The cap 20 has a cylindrical shape. The cap 20 is made of a metal such as an aluminum alloy. The cap 20 contacts the outer edge region 11B of the first lens surface 11 at one end surface. Further, a gap is formed between the outer peripheral side of the region in contact with the outer edge region 11B in the cap 20 and the outer edge region 11B. Further, the cap 20 is fixed to the barrel main body 30 in a state where the cap 20 is fitted to the end of the barrel main body 30 in a region on the outer peripheral side of a region where a gap is formed between the outer edge region 11B and the cap 20. Yes. In this way, the lens 10 is held by the lens barrel 50.
　本実施の形態の赤外線レンズモジュールであるレンズモジュール１においては、レンズ１０の温度を調整するヒータ６１がレンズ１０の外周面１３に固定される。ヒータ６１をレンズモジュール１の外部に設置し、外部からレンズ１０の温度を調整するのではなく、レンズ１０に固定されたヒータ６１によりレンズ１０の温度を調整（加熱）することで、レンズ１０を所望の温度に調整することが容易となっている。さらに、本実施の形態においては、レンズ１０と鏡筒５０（内セル３１）との間に間隔が形成されている。これにより、内セル３１との間の熱伝導が抑制され、レンズ１０の温度の調整が一層容易となっている。このように、本実施の形態のレンズモジュール１は、レンズ１０の温度の調整が容易な赤外線レンズモジュールとなっている。 In the lens module 1 that is the infrared lens module of the present embodiment, a heater 61 that adjusts the temperature of the lens 10 is fixed to the outer peripheral surface 13 of the lens 10. The heater 61 is installed outside the lens module 1, and the temperature of the lens 10 is not adjusted from the outside, but the temperature of the lens 10 is adjusted (heated) by the heater 61 fixed to the lens 10. It is easy to adjust to a desired temperature. Further, in the present embodiment, a gap is formed between the lens 10 and the lens barrel 50 (inner cell 31). Thereby, heat conduction with the inner cell 31 is suppressed, and the adjustment of the temperature of the lens 10 is further facilitated. Thus, the lens module 1 of the present embodiment is an infrared lens module in which the temperature of the lens 10 can be easily adjusted.
　なお、上記実施の形態２においては、内セル３１が金属からなる場合について説明したが、内セル３１は樹脂からなっていてもよい。金属に比べて熱伝導率の小さい樹脂をレンズ１０に接触する内セル３１を構成する材料として採用することにより、内セル３１との間の熱伝導が抑制され、レンズ１０の温度の調整が一層容易となる。 In addition, in the said Embodiment 2, although the case where the inner cell 31 consists of metals was demonstrated, the inner cell 31 may consist of resin. By adopting a resin having a thermal conductivity smaller than that of a metal as a material constituting the inner cell 31 in contact with the lens 10, heat conduction with the inner cell 31 is suppressed, and the temperature of the lens 10 is further adjusted. It becomes easy.
　（実施の形態３）
　次に、他の実施の形態である実施の形態３について説明する。図３は、実施の形態３におけるレンズモジュールの、光軸を含む断面を示す概略断面図である。図３を参照して、実施の形態３におけるレンズモジュール１は、レンズ１０と、鏡筒５０と、ヒータ６１とを備える。 (Embodiment 3)
Next, Embodiment 3 which is another embodiment will be described. FIG. 3 is a schematic cross-sectional view showing a cross section including the optical axis of the lens module according to the third embodiment. With reference to FIG. 3, the lens module 1 according to the third embodiment includes a lens 10, a lens barrel 50, and a heater 61.
　レンズ１０は、赤外線、より具体的には波長８μｍ以上１４μｍ以下の光を透過する赤外線レンズである。レンズ１０を構成する材料は、たとえばＺｎＳである。レンズ１０は、第１レンズ面１１と、第２レンズ面１２と、外周面１３とを含む。第１レンズ面１１は、中央に位置し、光軸Ｃと交差する凸面である中央領域１１Ａと、中央領域１１Ａを取り囲む平面である外縁領域１１Ｂとを含む。第２レンズ面１２は、中央に位置し、光軸Ｃと交差する凹面である中央領域１２Ａと、中央領域１２Ａを取り囲む平面である外縁領域１２Ｂとを含む。 The lens 10 is an infrared lens that transmits infrared light, more specifically, light having a wavelength of 8 μm to 14 μm. The material constituting the lens 10 is, for example, ZnS. The lens 10 includes a first lens surface 11, a second lens surface 12, and an outer peripheral surface 13. The first lens surface 11 includes a central region 11A that is a convex surface that is located at the center and intersects the optical axis C, and an outer edge region 11B that is a plane surrounding the central region 11A. The second lens surface 12 includes a central region 12A that is a concave surface that is located at the center and intersects the optical axis C, and an outer edge region 12B that is a plane surrounding the central region 12A.
　鏡筒５０は、キャップ２０と、鏡筒本体３０とを含む。鏡筒本体３０は、円筒状の形状を有する。鏡筒本体３０は、端部において第２レンズ面１２の外縁領域１２Ｂおよび外周面１３に接触してレンズ１０を支持する。 The lens barrel 50 includes a cap 20 and a lens barrel body 30. The lens barrel body 30 has a cylindrical shape. The lens barrel body 30 supports the lens 10 by contacting the outer edge region 12B and the outer peripheral surface 13 of the second lens surface 12 at the end.
　キャップ２０は、円筒状であって一方の端部に径方向内周側に突出する突出部２１が形成された形状を有する。キャップ２０は、アルミニウム合金などの金属からなっている。キャップ２０の内周面２２とレンズ１０の外周面１３とは接触する。また、キャップ２０の突出部２１と第１レンズ面１１の外縁領域１１Ｂとが接触する。キャップ２０は、鏡筒本体３０の一方の端部側に配置される。突出部２１が形成された側とは反対側の端部において、キャップ２０は鏡筒本体３０に対して接触して固定される。このようにして、レンズ１０は鏡筒本体３０とキャップ２０とに挟まれて鏡筒５０に保持される。 The cap 20 is cylindrical and has a shape in which a projecting portion 21 projecting radially inward is formed at one end. The cap 20 is made of a metal such as an aluminum alloy. The inner peripheral surface 22 of the cap 20 and the outer peripheral surface 13 of the lens 10 are in contact with each other. Further, the protruding portion 21 of the cap 20 and the outer edge region 11B of the first lens surface 11 are in contact with each other. The cap 20 is disposed on one end side of the barrel main body 30. The cap 20 is fixed in contact with the lens barrel body 30 at the end opposite to the side on which the protruding portion 21 is formed. In this way, the lens 10 is held between the lens barrel body 30 and the cap 20 and held by the lens barrel 50.
　キャップ２０には、突出部２１が形成された側とは反対側の端面から軸方向に入り込むように、円環状の溝部２３が形成されている。そして、溝部２３の内部に、レンズ１０の温度を調整するヒータ６１は設置される。ヒータ６１は、溝部２３の側壁に接触して固定される。ヒータ６１は、環状の溝部２３の周方向に沿って延在するように配置される。ヒータ６１は、溝部２３の側壁に全周にわたって接触するように配置されてもよい。ヒータ６１には、配線６２が接続されている。そして、配線６２は、電源（図示しない）に接続されている。電源から配線６２を介して供給される電力によって駆動されるヒータ６１は、レンズ１０を加熱することによりレンズ１０の温度を調整する。ヒータ６１は、たとえばフィルムヒータである。 An annular groove 23 is formed in the cap 20 so as to enter the axial direction from the end surface opposite to the side on which the protruding portion 21 is formed. A heater 61 that adjusts the temperature of the lens 10 is installed inside the groove 23. The heater 61 is fixed in contact with the side wall of the groove 23. The heater 61 is disposed so as to extend along the circumferential direction of the annular groove 23. The heater 61 may be disposed so as to contact the side wall of the groove 23 over the entire circumference. A wiring 62 is connected to the heater 61. The wiring 62 is connected to a power source (not shown). A heater 61 driven by electric power supplied from the power source via the wiring 62 adjusts the temperature of the lens 10 by heating the lens 10. The heater 61 is, for example, a film heater.
　本実施の形態の赤外線レンズモジュールであるレンズモジュール１においては、レンズ１０の温度を調整するヒータ６１がキャップ２０に形成された溝部２３内に固定される。ヒータ６１をレンズモジュール１の外部に設置し、外部からレンズ１０の温度を調整するのではなく、キャップ２０に固定されたヒータ６１によりレンズ１０の温度を調整（加熱）することで、レンズ１０を所望の温度に調整することが容易となっている。 In the lens module 1 that is the infrared lens module of the present embodiment, a heater 61 that adjusts the temperature of the lens 10 is fixed in the groove 23 formed in the cap 20. Rather than installing the heater 61 outside the lens module 1 and adjusting the temperature of the lens 10 from the outside, the temperature of the lens 10 is adjusted (heated) by the heater 61 fixed to the cap 20. It is easy to adjust to a desired temperature.
　また、レンズモジュール１において、鏡筒本体３０のレンズ１０に接触する領域は、キャップ２０のレンズ１０に接触する領域よりも熱伝導率が小さい材料からなっていることが好ましい。本実施の形態において、キャップ２０は金属、具体的にはアルミニウム合金からなり、鏡筒本体３０はキャップ２０を構成する金属よりも熱伝導率が小さい材料である樹脂からなっている。これにより、レンズ１０と鏡筒本体３０との間の熱伝導が抑制され、レンズ１０の温度の調整が一層容易となっている。 In the lens module 1, the region of the lens barrel body 30 that contacts the lens 10 is preferably made of a material having a lower thermal conductivity than the region of the cap 20 that contacts the lens 10. In the present embodiment, the cap 20 is made of a metal, specifically, an aluminum alloy, and the lens barrel body 30 is made of a resin that is a material having a lower thermal conductivity than the metal constituting the cap 20. Thereby, the heat conduction between the lens 10 and the lens barrel body 30 is suppressed, and the adjustment of the temperature of the lens 10 is further facilitated.
　さらに、レンズモジュール１において、キャップ２０の、外部に露出する面以外の面の放射率は０．７以下であることが好ましい。本実施の形態のキャップ２０において外部に露出する面である突出部２１の内周面２６、突出部２１側の端面２５および外周面２４には黒アルマイト層が形成されている。黒アルマイト層は、アルマイト処理（陽極酸化処理）後に、アルマイト処理によって形成されたアルマイト層（酸化層）の空孔内に黒色の染料を導入することにより形成することができる。黒アルマイト層が形成されることにより、外部に露出する面であるこれらの面の放射率は０．７を超える状態とされている。一方、キャップ２０において外部に露出する面以外の面である突出部２１のレンズ１０に接触する面であるレンズ保持面２７の少なくとも一部および内周面２２の少なくとも一部には黒アルマイト層は形成されていない。突出部２１のレンズ１０に接触する面であるレンズ保持面２７および内周面２２においては、キャップ２０を構成する材料であるアルミニウム合金などの金属が露出していてもよいし、黒アルマイト層よりも放射率の低い表面処理層が露出していてもよい。その結果、突出部２１のレンズ１０に接触する面であるレンズ保持面２７および内周面２２の放射率は０．７以下となっている。これにより、キャップ２０からの放熱量が低減され、レンズ１０の温度の調整が一層容易となっている。レンズ１０の温度の調整をさらに容易にする観点から、上記放射率は０．５以下であることが好ましく、０．３以下であることがより好ましい。 Furthermore, in the lens module 1, the emissivity of the surface of the cap 20 other than the surface exposed to the outside is preferably 0.7 or less. In the cap 20 of the present embodiment, a black alumite layer is formed on the inner peripheral surface 26 of the protruding portion 21, the end surface 25 on the protruding portion 21 side, and the outer peripheral surface 24, which are the surfaces exposed to the outside. The black alumite layer can be formed by introducing a black dye into the pores of the alumite layer (oxidized layer) formed by the alumite treatment after the alumite treatment (anodic oxidation treatment). By forming the black alumite layer, the emissivity of these surfaces, which are surfaces exposed to the outside, exceeds 0.7. On the other hand, the black alumite layer is formed on at least a part of the lens holding surface 27 and at least a part of the inner peripheral surface 22 which are surfaces that contact the lens 10 of the protruding portion 21 that is a surface other than the surface exposed to the outside in the cap 20. Not formed. On the lens holding surface 27 and the inner peripheral surface 22 that are the surfaces of the protruding portion 21 that are in contact with the lens 10, a metal such as an aluminum alloy that is a material constituting the cap 20 may be exposed, or from the black alumite layer. Alternatively, the surface treatment layer having a low emissivity may be exposed. As a result, the emissivities of the lens holding surface 27 and the inner peripheral surface 22 which are surfaces of the protruding portion 21 that are in contact with the lens 10 are 0.7 or less. Thereby, the amount of heat released from the cap 20 is reduced, and the adjustment of the temperature of the lens 10 is further facilitated. From the viewpoint of further facilitating the adjustment of the temperature of the lens 10, the emissivity is preferably 0.5 or less, and more preferably 0.3 or less.
　（実施の形態４）
　次に、他の実施の形態である実施の形態４について説明する。図４は、実施の形態４におけるレンズモジュールの、光軸を含む断面を示す概略断面図である。図４および図３を参照して、実施の形態４におけるレンズモジュール１は、基本的には実施の形態３の場合と同様の構成を有し、同様の効果を奏する。しかし、実施の形態４のレンズモジュール１は、鏡筒本体３０の構造において実施の形態３の場合とは異なっている。 (Embodiment 4)
Next, Embodiment 4 which is another embodiment will be described. FIG. 4 is a schematic cross-sectional view showing a cross section including the optical axis of the lens module in the fourth embodiment. Referring to FIGS. 4 and 3, lens module 1 in the fourth embodiment basically has the same configuration as in the third embodiment, and has the same effects. However, the lens module 1 according to the fourth embodiment is different from the third embodiment in the structure of the lens barrel body 30.
　図４を参照して、実施の形態４の鏡筒本体３０は、キャップ２０に面する側の端部から径方向外側に突出する突出部３４を含む。突出部３４は、実施の形態３における溝部２３の開口を覆う（図３および図４参照）。その結果、溝部２３と突出部３４とにより、環状空間２８が形成される。本実施の形態において、ヒータ６１は、環状空間２８内に設置される。ヒータ６１をレンズモジュール１の外部に設置し、外部からレンズ１０の温度を調整するのではなく、このような態様にてキャップ２０に設置されたヒータ６１によりレンズ１０の温度を調整（加熱）することで、レンズ１０を所望の温度に調整することが容易となっている。また、突出部３４が形成されることにより、ヒータ６１の脱落の発生を抑制することができる。 Referring to FIG. 4, the lens barrel body 30 of the fourth embodiment includes a protruding portion 34 that protrudes radially outward from an end portion on the side facing the cap 20. Projection 34 covers the opening of groove 23 in the third embodiment (see FIGS. 3 and 4). As a result, the annular space 28 is formed by the groove 23 and the protrusion 34. In the present embodiment, the heater 61 is installed in the annular space 28. Rather than installing the heater 61 outside the lens module 1 and adjusting the temperature of the lens 10 from the outside, the temperature of the lens 10 is adjusted (heated) by the heater 61 installed in the cap 20 in this manner. This makes it easy to adjust the lens 10 to a desired temperature. In addition, since the protrusion 34 is formed, it is possible to prevent the heater 61 from dropping off.
　（実施の形態５）
　次に、他の実施の形態である実施の形態５について説明する。図５は、実施の形態５におけるレンズモジュールの、光軸を含む断面を示す概略断面図である。図５および図３を参照して、実施の形態５におけるレンズモジュール１は、基本的には実施の形態３の場合と同様の構成を有し、同様の効果を奏する。しかし、実施の形態５のレンズモジュール１は、キャップ２０の構造において実施の形態３の場合とは異なっている。 (Embodiment 5)
Next, Embodiment 5 which is another embodiment will be described. FIG. 5 is a schematic cross-sectional view showing a cross section including the optical axis of the lens module according to the fifth embodiment. Referring to FIGS. 5 and 3, lens module 1 in the fifth embodiment basically has the same configuration as that in the third embodiment and has the same effects. However, the lens module 1 according to the fifth embodiment is different from the third embodiment in the structure of the cap 20.
　図５を参照して、実施の形態５のキャップ２０は、保持部材２９Ａを含む。本実施の形態において、キャップ２０の本体部の鏡筒本体３０とは反対側の端部には径方向外側に突出する突出部が形成されている。一方、本体部の外周側に、中空円筒状の形状を有し、鏡筒本体３０側の端部に径方向内側に突出する突出部が形成された保持部材２９Ａが配置される。これにより、キャップ２０の本体部と保持部材２９Ａとの間に環状空間２８が形成される。本実施の形態において、ヒータ６１は、環状空間２８内に設置される。ヒータ６１は、保持部材２９Ａによって外周側から支持される。ヒータ６１をレンズモジュール１の外部に設置し、外部からレンズ１０の温度を調整するのではなく、このような態様にてキャップ２０に設置されたヒータ６１によりレンズ１０の温度を調整（加熱）することで、レンズ１０を所望の温度に調整することが容易となっている。保持部材２９Ａは、アルミニウム合金などの金属からなっていてもよいし、樹脂からなっていてもよい。保持部材２９Ａを構成する材料として金属を採用することにより、高い耐久性が得られる。保持部材２９Ａを構成する材料として熱伝導率の小さい樹脂を採用することにより、キャップ２０からの放熱を抑制し、レンズ１０を所望の温度に調整することが容易となる。 Referring to FIG. 5, cap 20 of the fifth embodiment includes a holding member 29A. In the present embodiment, a protruding portion that protrudes radially outward is formed at the end of the main body portion of the cap 20 opposite to the lens barrel main body 30. On the other hand, on the outer peripheral side of the main body, a holding member 29A having a hollow cylindrical shape and having a protruding portion that protrudes radially inward at the end on the lens barrel main body 30 side is disposed. Thereby, an annular space 28 is formed between the main body portion of the cap 20 and the holding member 29A. In the present embodiment, the heater 61 is installed in the annular space 28. The heater 61 is supported from the outer peripheral side by the holding member 29A. Rather than installing the heater 61 outside the lens module 1 and adjusting the temperature of the lens 10 from the outside, the temperature of the lens 10 is adjusted (heated) by the heater 61 installed in the cap 20 in this manner. This makes it easy to adjust the lens 10 to a desired temperature. The holding member 29A may be made of a metal such as an aluminum alloy, or may be made of a resin. By adopting a metal as the material constituting the holding member 29A, high durability can be obtained. By adopting a resin having a low thermal conductivity as a material constituting the holding member 29A, it is easy to suppress heat dissipation from the cap 20 and adjust the lens 10 to a desired temperature.
　（実施の形態６）
　次に、他の実施の形態である実施の形態６について説明する。図６は、実施の形態６におけるレンズモジュールの、光軸を含む断面を示す概略断面図である。図６および図５を参照して、実施の形態６におけるレンズモジュール１は、基本的には実施の形態５の場合と同様の構成を有し、同様の効果を奏する。しかし、実施の形態６のレンズモジュール１は、鏡筒本体３０およびキャップ２０（保持部材２９Ａ）の構造において実施の形態５の場合とは異なっている。 (Embodiment 6)
Next, Embodiment 6 which is another embodiment will be described. FIG. 6 is a schematic cross-sectional view showing a cross section including the optical axis of the lens module in the sixth embodiment. Referring to FIGS. 6 and 5, lens module 1 in the sixth embodiment has basically the same configuration as in the fifth embodiment, and has the same effects. However, the lens module 1 of the sixth embodiment is different from that of the fifth embodiment in the structure of the lens barrel body 30 and the cap 20 (holding member 29A).
　図６を参照して、実施の形態６の鏡筒本体３０は、キャップ２０に面する側の端部から径方向外側に突出する突出部３４を含む。また、保持部材２９Ａには実施の形態５の場合のような突出部は形成されておらず、保持部材２９Ａは中空円筒状の形状を有する。これにより、キャップ２０の本体部と保持部材２９Ａとの間に環状空間２８が形成される。本実施の形態において、ヒータ６１は、環状空間２８内に設置される。ヒータ６１は、保持部材２９Ａによって外周側から支持される。ヒータ６１をレンズモジュール１の外部に設置し、外部からレンズ１０の温度を調整するのではなく、このような態様にてキャップ２０に設置されたヒータ６１によりレンズ１０の温度を調整（加熱）することで、レンズ１０を所望の温度に調整することが容易となっている。 Referring to FIG. 6, the lens barrel body 30 of the sixth embodiment includes a protruding portion 34 that protrudes radially outward from an end portion on the side facing the cap 20. The holding member 29A is not formed with a protruding portion as in the fifth embodiment, and the holding member 29A has a hollow cylindrical shape. Thereby, an annular space 28 is formed between the main body portion of the cap 20 and the holding member 29A. In the present embodiment, the heater 61 is installed in the annular space 28. The heater 61 is supported from the outer peripheral side by the holding member 29A. The heater 61 is installed outside the lens module 1 and the temperature of the lens 10 is not adjusted from the outside, but the temperature of the lens 10 is adjusted (heated) by the heater 61 installed in the cap 20 in this manner. This makes it easy to adjust the lens 10 to a desired temperature.
　（実施の形態７）
　次に、他の実施の形態である実施の形態７について説明する。図７は、実施の形態７におけるレンズモジュールの、光軸を含む断面を示す概略断面図である。図７および図３を参照して、実施の形態７におけるレンズモジュール１は、基本的には実施の形態３の場合と同様の構成を有し、同様の効果を奏する。しかし、実施の形態７のレンズモジュール１は、キャップ２０の構造において実施の形態３の場合とは異なっている。 (Embodiment 7)
Next, Embodiment 7 which is another embodiment will be described. FIG. 7 is a schematic cross-sectional view showing a cross section including the optical axis of the lens module according to the seventh embodiment. 7 and 3, the lens module 1 according to the seventh embodiment has basically the same configuration as that of the third embodiment and has the same effects. However, the lens module 1 according to the seventh embodiment is different from the third embodiment in the structure of the cap 20.
　図７を参照して、実施の形態７のキャップ２０は、保持部材２９Ｂを含む。本実施の形態において、キャップ２０の内周面には溝が形成されており、当該溝の開口を覆うように、中空円筒状の形状を有する保持部材２９Ｂが配置される。これにより、キャップ２０の本体部と保持部材２９Ｂとの間に環状空間２８が形成される。本実施の形態において、ヒータ６１は、環状空間２８内に設置される。ヒータ６１は、保持部材２９Ｂによって内周側から支持される。ヒータ６１をレンズモジュール１の外部に設置し、外部からレンズ１０の温度を調整するのではなく、このような態様にてキャップ２０に設置されたヒータ６１によりレンズ１０の温度を調整（加熱）することで、レンズ１０を所望の温度に調整することが容易となっている。保持部材２９Ｂは、たとえばアルミニウム合金などの金属からなっていてもよい。 Referring to FIG. 7, the cap 20 of the seventh embodiment includes a holding member 29B. In the present embodiment, a groove is formed on the inner peripheral surface of the cap 20, and a holding member 29B having a hollow cylindrical shape is disposed so as to cover the opening of the groove. Thereby, an annular space 28 is formed between the main body portion of the cap 20 and the holding member 29B. In the present embodiment, the heater 61 is installed in the annular space 28. The heater 61 is supported from the inner peripheral side by the holding member 29B. Rather than installing the heater 61 outside the lens module 1 and adjusting the temperature of the lens 10 from the outside, the temperature of the lens 10 is adjusted (heated) by the heater 61 installed in the cap 20 in this manner. This makes it easy to adjust the lens 10 to a desired temperature. The holding member 29B may be made of a metal such as an aluminum alloy.
　（実施の形態８）
　次に、他の実施の形態である実施の形態８について説明する。図８は、実施の形態８におけるレンズモジュールの、光軸を含む断面を示す概略断面図である。図８および図７を参照して、実施の形態８におけるレンズモジュール１は、基本的には実施の形態７の場合と同様の構成を有し、同様の効果を奏する。しかし、実施の形態８のレンズモジュール１は、鏡筒本体３０およびキャップ２０の構造において実施の形態７の場合とは異なっている。 (Embodiment 8)
Next, an eighth embodiment, which is another embodiment, will be described. FIG. 8 is a schematic sectional view showing a section including the optical axis of the lens module according to the eighth embodiment. Referring to FIGS. 8 and 7, the lens module 1 according to the eighth embodiment basically has the same configuration as that of the seventh embodiment and has the same effects. However, the lens module 1 of the eighth embodiment is different from that of the seventh embodiment in the structure of the lens barrel body 30 and the cap 20.
　図８を参照して、実施の形態８の鏡筒本体３０は、キャップ２０に面する側の端部から径方向外側に突出する突出部３４を含む。キャップ２０には、実施の形態７の場合のような溝の鏡筒本体３０側の壁は形成されていない。そして、保持部材２９Ｂは、実施の形態７の場合と同様に中空円筒状の形状を有する。これにより、キャップ２０の本体部、保持部材２９Ｂおよび鏡筒本体３０の突出部３４に取り囲まれる環状空間２８が形成される。本実施の形態において、ヒータ６１は、環状空間２８内に設置される。ヒータ６１は、保持部材２９Ｂによって内周側から支持される。ヒータ６１をレンズモジュール１の外部に設置し、外部からレンズ１０の温度を調整するのではなく、このような態様にてキャップ２０に設置されたヒータ６１によりレンズ１０の温度を調整（加熱）することで、レンズ１０を所望の温度に調整することが容易となっている。 Referring to FIG. 8, the lens barrel body 30 of the eighth embodiment includes a protruding portion 34 that protrudes radially outward from an end portion on the side facing the cap 20. The cap 20 is not formed with a wall on the lens barrel body 30 side of the groove as in the seventh embodiment. The holding member 29B has a hollow cylindrical shape as in the case of the seventh embodiment. Thereby, an annular space 28 surrounded by the main body portion of the cap 20, the holding member 29 </ b> B, and the protruding portion 34 of the lens barrel main body 30 is formed. In the present embodiment, the heater 61 is installed in the annular space 28. The heater 61 is supported from the inner peripheral side by the holding member 29B. Rather than installing the heater 61 outside the lens module 1 and adjusting the temperature of the lens 10 from the outside, the temperature of the lens 10 is adjusted (heated) by the heater 61 installed in the cap 20 in this manner. This makes it easy to adjust the lens 10 to a desired temperature.
　（実施の形態９）
　次に、他の実施の形態である実施の形態９について説明する。図９は、実施の形態９におけるレンズモジュールの、光軸を含む断面を示す概略断面図である。図９および図１を参照して、実施の形態９におけるレンズモジュール１は、基本的には実施の形態１の場合と同様の構成を有し、同様の効果を奏する。しかし、実施の形態９のレンズモジュール１は、ヒータ６１の配置において実施の形態１の場合とは異なっている。 (Embodiment 9)
Next, Embodiment 9 which is another embodiment will be described. FIG. 9 is a schematic sectional view showing a section including the optical axis of the lens module according to the ninth embodiment. Referring to FIGS. 9 and 1, the lens module 1 according to the ninth embodiment basically has the same configuration as that of the first embodiment and has the same effects. However, the lens module 1 according to the ninth embodiment is different from the first embodiment in the arrangement of the heater 61.
　図９を参照して、実施の形態９のヒータ６１は、キャップ２０の内周面２２に設置されている。ヒータ６１をレンズモジュール１の外部に設置し、外部からレンズ１０の温度を調整するのではなく、このような態様にてキャップ２０に設置されたヒータ６１によりレンズ１０の温度を調整（加熱）することで、レンズ１０を所望の温度に調整することが容易となっている。 Referring to FIG. 9, the heater 61 of the ninth embodiment is installed on the inner peripheral surface 22 of the cap 20. Rather than installing the heater 61 outside the lens module 1 and adjusting the temperature of the lens 10 from the outside, the temperature of the lens 10 is adjusted (heated) by the heater 61 installed in the cap 20 in this manner. This makes it easy to adjust the lens 10 to a desired temperature.
　（実施の形態１０）
　次に、他の実施の形態である実施の形態１０について説明する。図１０は、実施の形態１０におけるレンズモジュールの、光軸を含む断面を示す概略断面図である。図１０および図９を参照して、実施の形態１０におけるレンズモジュール１は、基本的には実施の形態９の場合と同様の構成を有し、同様の効果を奏する。しかし、実施の形態１０のレンズモジュール１は、ヒータ６１の配置において実施の形態９の場合とは異なっている。 (Embodiment 10)
Next, Embodiment 10 which is another embodiment will be described. FIG. 10 is a schematic cross-sectional view showing a cross section including the optical axis of the lens module according to the tenth embodiment. Referring to FIGS. 10 and 9, lens module 1 in the tenth embodiment has basically the same configuration as in the ninth embodiment and has the same effects. However, the lens module 1 of the tenth embodiment differs from the ninth embodiment in the arrangement of the heater 61.
　図１０を参照して、実施の形態１０のヒータ６１は、キャップ２０の突出部２１において環状空間２８に面する面（環状空間２８から見て外縁領域１１Ｂとは反対側の面）に設置されている。ヒータ６１をレンズモジュール１の外部に設置し、外部からレンズ１０の温度を調整するのではなく、このような態様にてキャップ２０に設置されたヒータ６１によりレンズ１０の温度を調整（加熱）することで、レンズ１０を所望の温度に調整することが容易となっている。 Referring to FIG. 10, heater 61 of the tenth embodiment is installed on the surface facing annular space 28 in protrusion 21 of cap 20 (the surface opposite to outer edge region 11 </ b> B as viewed from annular space 28). ing. Rather than installing the heater 61 outside the lens module 1 and adjusting the temperature of the lens 10 from the outside, the temperature of the lens 10 is adjusted (heated) by the heater 61 installed in the cap 20 in this manner. This makes it easy to adjust the lens 10 to a desired temperature.
　（実施の形態１１）
　次に、他の実施の形態である実施の形態１１について説明する。図１１は、実施の形態１１におけるレンズモジュールの、光軸を含む断面を示す概略断面図である。図１１および図３を参照して、実施の形態１１におけるレンズモジュール１は、基本的には実施の形態３の場合と同様の構成を有し、同様の効果を奏する。しかし、実施の形態７のレンズモジュール１は、キャップ２０の構造において実施の形態３の場合とは異なっている。 (Embodiment 11)
Next, Embodiment 11 which is another embodiment will be described. FIG. 11 is a schematic sectional view showing a section including the optical axis of the lens module according to the eleventh embodiment. Referring to FIGS. 11 and 3, lens module 1 according to the eleventh embodiment has basically the same configuration as that of the third embodiment and has the same effects. However, the lens module 1 according to the seventh embodiment is different from the third embodiment in the structure of the cap 20.
　図１１を参照して、実施の形態１１のキャップ２０は、保持部材２９Ｃを含む。本実施の形態において、キャップ２０には溝部２３は形成されていない。そして、キャップ２０の本体部の鏡筒本体３０とは反対側の端面側に当該端面に向けて開口する環状の溝を有する円環状の保持部材２９Ｃが配置される。保持部材２９Ｃの溝の開口がキャップ２０の本体部に覆われるように、保持部材２９Ｃが配置される。これにより、キャップ２０の本体部と保持部材２９Ｃとの間に環状空間２８が形成される。本実施の形態において、ヒータ６１は、環状空間２８内に設置される。ヒータ６１をレンズモジュール１の外部に設置し、外部からレンズ１０の温度を調整するのではなく、このような態様にてキャップ２０に設置されたヒータ６１によりレンズ１０の温度を調整（加熱）することで、レンズ１０を所望の温度に調整することが容易となっている。保持部材２９Ｃは、アルミニウム合金などの金属からなっていてもよいし、樹脂からなっていてもよい。保持部材２９Ｃを構成する材料として金属を採用することにより、高い耐久性が得られる。保持部材２９Ｃを構成する材料として熱伝導率の小さい樹脂を採用することにより、キャップ２０からの放熱を抑制し、レンズ１０を所望の温度に調整することが容易となる。 Referring to FIG. 11, the cap 20 of the eleventh embodiment includes a holding member 29C. In the present embodiment, the groove portion 23 is not formed in the cap 20. An annular holding member 29 </ b> C having an annular groove that opens toward the end surface is disposed on the end surface of the main body of the cap 20 opposite to the lens barrel body 30. The holding member 29C is disposed so that the opening of the groove of the holding member 29C is covered by the main body portion of the cap 20. Thereby, an annular space 28 is formed between the main body portion of the cap 20 and the holding member 29C. In the present embodiment, the heater 61 is installed in the annular space 28. Rather than installing the heater 61 outside the lens module 1 and adjusting the temperature of the lens 10 from the outside, the temperature of the lens 10 is adjusted (heated) by the heater 61 installed in the cap 20 in this manner. This makes it easy to adjust the lens 10 to a desired temperature. The holding member 29C may be made of a metal such as an aluminum alloy, or may be made of a resin. By adopting a metal as a material constituting the holding member 29C, high durability can be obtained. By adopting a resin having a low thermal conductivity as a material constituting the holding member 29C, it is easy to suppress heat dissipation from the cap 20 and adjust the lens 10 to a desired temperature.
　なお、上記実施の形態においては、温度調整装置としてヒータ（フィルムヒータ）が採用される場合について説明したが、採用可能な温度調整装置はこれに限られず、たとえば、ラバーヒータ、シートヒータなどの薄型面状ヒータや線状ヒータであってもよい。また、図１～図１１においては、それぞれ一枚のレンズ１０のみを図示したが、レンズ１０の後方（第２レンズ面１２に面する側）に他のレンズが存在してもよい。また、上記実施の形態１および２においては、温度調整装置であるヒータ６１がレンズの外周面１３に配置（固定）される場合について説明したが、これに代えて、またはこれとともに、温度調整装置がレンズ面の外縁領域（外縁領域１１Ｂ、外縁領域１２Ｂ）に配置（固定）されてもよい。 In the above embodiment, the case where a heater (film heater) is employed as the temperature adjustment device has been described. However, the temperature adjustment device that can be employed is not limited to this, and for example, a thin heater such as a rubber heater or a seat heater. A planar heater or a linear heater may be used. 1 to 11, only one lens 10 is illustrated, but another lens may be present behind the lens 10 (side facing the second lens surface 12). In the first and second embodiments, the case where the heater 61 as a temperature adjusting device is disposed (fixed) on the outer peripheral surface 13 of the lens has been described. Instead of this, or in addition to this, the temperature adjusting device. May be arranged (fixed) in the outer edge region (outer edge region 11B, outer edge region 12B) of the lens surface.
　今回開示された実施の形態はすべての点で例示であって、どのような面からも制限的なものではないと理解されるべきである。本発明の範囲は上記した説明ではなく、請求の範囲によって規定され、請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 It should be understood that the embodiment disclosed herein is illustrative in all respects and is not restrictive in any way. The scope of the present invention is defined by the scope of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the scope of the claims.
　１　レンズモジュール、１０　レンズ、１１　第１レンズ面、１１Ａ　中央領域、１１Ｂ　外縁領域、１２　第２レンズ面、１２Ａ　中央領域、１２Ｂ　外縁領域、１３　外周面、２０　キャップ、２１　突出部、２２　内周面、２３　溝部、２４　外周面、２５　端面、２６　内周面、２７　レンズ保持面、２８　環状空間、２９Ａ　保持部材、２９Ｂ　保持部材、２９Ｃ　保持部材、３０　鏡筒本体、３１　内セル、３１Ａ　突出部、３１Ｂ　内周面、３２　中セル、３３　外セル、３４　突出部、５０　鏡筒、６１　ヒータ、６２　配線。 1 lens module, 10 lens, 11 first lens surface, 11A central region, 11B outer edge region, 12 second lens surface, 12A central region, 12B outer edge region, 13 outer peripheral surface, 20 cap, 21 protruding portion, 22 inner peripheral surface , 23 groove portion, 24 outer peripheral surface, 25 end surface, 26 inner peripheral surface, 27 lens holding surface, 28 annular space, 29A holding member, 29B holding member, 29C holding member, 30 lens barrel body, 31 inner cell, 31A protruding portion, 31B inner peripheral surface, 32 middle cell, 33 outer cell, 34 protrusion, 50 lens barrel, 61 heater, 62 wiring.

Claims (4)

  1. 　赤外線を透過するレンズと、
    　前記レンズを保持する鏡筒と、
    　前記レンズに配置され、前記レンズの温度を調整する温度調整装置と、を備える、赤外線レンズモジュール。     A lens that transmits infrared rays;
    A lens barrel for holding the lens;
    An infrared lens module, comprising: a temperature adjusting device that is disposed on the lens and adjusts the temperature of the lens.
  2. 　前記レンズと前記鏡筒との間には間隔が形成される、請求項１に記載の赤外線レンズモジュール。 The infrared lens module according to claim 1, wherein a gap is formed between the lens and the lens barrel.
  3. 　前記温度調整装置は、前記レンズの外周面およびレンズ面の外縁領域の少なくともいずれか一方に配置される、請求項１または請求項２に記載の赤外線レンズモジュール。 3. The infrared lens module according to claim 1, wherein the temperature adjusting device is disposed on at least one of an outer peripheral surface of the lens and an outer edge region of the lens surface.
  4. 　前記レンズを構成する材料は硫化亜鉛である、請求項１～請求項３のいずれか１項に記載の赤外線レンズモジュール。 The infrared lens module according to any one of claims 1 to 3, wherein a material constituting the lens is zinc sulfide.
PCT/JP2017/009845 2016-03-15 2017-03-10 Infrared lens module WO2017159581A1 (en)

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