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WO2016208433A1 - Système de lentille infrarouge lointain, appareil optique d'imagerie et dispositif numérique - Google Patents

Système de lentille infrarouge lointain, appareil optique d'imagerie et dispositif numérique Download PDF

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WO2016208433A1
WO2016208433A1 PCT/JP2016/067491 JP2016067491W WO2016208433A1 WO 2016208433 A1 WO2016208433 A1 WO 2016208433A1 JP 2016067491 W JP2016067491 W JP 2016067491W WO 2016208433 A1 WO2016208433 A1 WO 2016208433A1
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lens
far
infrared
lens system
infinity
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Japanese (ja)
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杭迫　真奈美
敦司 山下
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Konica Minolta Inc
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Konica Minolta Inc
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    • 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

Definitions

  • the present invention relates to a far-infrared lens system, an imaging optical device, and a digital device.
  • an imaging lens system used in the far-infrared band (wavelength 8 to 12 ⁇ m band), and particularly has a brightness with a peripheral light amount ratio of 50% or more even at a wide angle where the half angle of view ⁇ is greater than 30 °
  • a far-infrared lens system that can be used in an inexpensive camera system an imaging optical device that captures far-infrared images obtained by the far-infrared lens system with a far-infrared sensor, and a digital device with an image input function equipped with a far-infrared lens system , About.
  • Patent Documents 1 to 4 propose a relatively wide-angle infrared lens system including three lenses.
  • JP 2011-253006 A JP-A-4-128709 Japanese Unexamined Patent Publication No. 2009-63942 US2010 / 0232013 A1
  • the lens system described in Patent Document 1 is a three-element far-infrared lens system that covers a wide range from a standard angle of view to a wide angle with a half angle of view ⁇ of 30 ° or more.
  • the peripheral light amount ratio can be 50% or more if the off-axis light beam is restricted only by the diaphragm and is configured without vignetting.
  • the focal length of the second lens is shorter than the focal length of the entire system, and the second lens has a shorter focal length than the third lens, the half angle of view ⁇ is 30 ° or more.
  • the off-axis light beam becomes thin, and the angle at which the off-axis chief ray reaches the image plane is tilted to the same angle as the field angle. It becomes impossible to make it 50% or more.
  • the peripheral light amount ratio is about 25% to 40%.
  • the lens system described in Patent Document 4 is a lens system for near infrared rays, it has the same focal length ratio of the second lens and that of the second and third lenses as those described in Patent Document 1. Yes. Therefore, in the lens system having a half angle of view ⁇ of 30 ° or more, the peripheral light amount ratio is similarly less than 50%.
  • the focal length of the second lens is slightly longer, but this is not sufficient from the viewpoint of the peripheral light quantity ratio.
  • the peripheral light amount ratio is not a problem when the angle of view is from standard to telephoto.
  • the lens is used in a wide-angle lens system having a half angle of view ⁇ of 30 ° or more, the peripheral light amount ratio is less than 50%, which is not desirable as a lens system specification.
  • a material having a refractive index smaller than 2.9 is used for the first lens.
  • the first lens cannot have a very strong curvature, and the interval between the first lens and the second lens is narrowed to ensure performance.
  • a lens system having a half angle of view ⁇ of 30 ° or less can ensure a sufficient peripheral light amount ratio and lens performance.
  • the half angle of view ⁇ is greater than 30 °
  • the off-axis light flux does not pass through a position higher than the optical axis in the first lens, and therefore, off-axis due to a local refractive power difference between the on-axis and the periphery.
  • the effect of enlarging the pupil is hardly obtained, and the peripheral light amount ratio falls below 50%.
  • a diaphragm is arranged in the foreground in a three-lens lens system.
  • the front lens diameter can be reduced even with a wide-angle lens system.
  • the angle of view is determined by the cos 4th power law.
  • the peripheral light amount ratio is reduced by that amount.
  • the third lens has a strong convex surface facing the image side.
  • the angle at which the off-axis light beam reaches the image plane can be easily controlled, but the off-axis light beam passes through a high position on the rear surface of the third lens and is refracted rapidly.
  • An external coma aberration is generated and distortion is greatly negative, which is not preferable for a thermo camera.
  • the present invention has been made in view of such a situation.
  • the object of the present invention is to have a peripheral light quantity ratio of 50% or more while the half angle of view ⁇ is a wide angle larger than 30 ° and as few as three.
  • An object of the present invention is to provide a high-performance and inexpensive far-infrared lens system in which aberrations are favorably corrected even with the number of lenses, an imaging optical device and a digital device including the same.
  • the far-infrared lens system of the first invention is a lens system used in the far-infrared band,
  • the lens is composed of three single lenses of a first lens having negative power, a second lens having positive power, and a third lens having positive power.
  • the following conditional expression ( 1) is satisfied, and the half angle of view is larger than 30 °.
  • f2 focal length of the second lens
  • f focal length of the entire far-infrared lens system, It is.
  • a far-infrared lens system according to a second invention is characterized in that, in the first invention, the first lens is made of a material having a refractive index larger than 2.9 at a wavelength of 10 ⁇ m.
  • a far-infrared lens system is characterized in that, in the first or second aspect, the first lens has a negative meniscus shape having a convex surface facing the object side.
  • the far-infrared lens system of the fourth invention is characterized in that, in the third invention, the following conditional expression (2) is satisfied. 3.0 ⁇ d2 / f ⁇ 9.0 (2) However, d2: axial distance between the image side surface of the first lens and the object side surface of the second lens, f: focal length of the entire far-infrared lens system, It is.
  • a far-infrared lens system is characterized in that, in any one of the first to fourth inventions, the second lens has a positive meniscus shape or plano-convex shape with a convex surface facing the object side. To do.
  • a far-infrared lens system is characterized in that, in any one of the first to fifth inventions, a diaphragm is provided between an image side surface of the first lens and an object side of the third lens.
  • a far-infrared lens system is the bi-convex lens according to any one of the first to sixth inventions, wherein the third lens has a convex surface having a stronger power directed toward the object side when both surfaces are compared. It has a shape or a positive meniscus shape with a convex surface facing the object side.
  • the far-infrared lens system of the eighth invention is characterized in that, in any one of the first to seventh inventions, the following conditional expression (3) is satisfied. 1.7 ⁇ f23 / f ⁇ 2.8 (3) However, f23: composite focal length of the second lens and the third lens, f: focal length of the entire far-infrared lens system, It is.
  • the far-infrared lens system of the ninth invention is characterized in that, in any one of the first to eighth inventions, the following conditional expression (4) is satisfied. 1.45 ⁇ f2 / f3 ⁇ 8.0 (4) However, f2: focal length of the second lens, f3: focal length of the third lens, It is.
  • An imaging optical device is a far-infrared lens system according to any one of the first to ninth inventions, and a far-infrared optical image formed on the imaging surface is converted to an electrical signal.
  • An infrared sensor, and the far-infrared lens system is provided so that a far-infrared optical image of a subject is formed on an imaging surface of the far-infrared sensor.
  • the digital apparatus is characterized in that at least one of a still image photographing and a moving image photographing function of a subject is added by including the imaging optical device according to the tenth aspect.
  • a far-infrared camera system includes the far-infrared lens system according to any one of the first to ninth aspects.
  • three bright and high-performance far-infrared lens systems capable of obtaining a peripheral light amount ratio of 50% or more while having a distortion within ⁇ 5% and a half angle of view ⁇ larger than 30 ° are provided.
  • a wide-angle far-infrared lens system suitable for a thermo camera that requires temperature detection can be provided at a low cost. Therefore, it is possible to realize an inexpensive but high-performance far-infrared lens system and an imaging optical device including the same.
  • the far-infrared lens system or the imaging optical device according to the present invention in a digital device such as a night vision device, a thermography, a portable terminal, a camera system (for example, a digital camera, a surveillance camera, a security camera, an in-vehicle camera). Therefore, it is possible to add a high-performance far-infrared image input function to a digital device at a low cost and in a compact manner.
  • FIG. 6 is an aberration diagram of Example 1.
  • FIG. 6 is an aberration diagram of Example 2.
  • FIG. 6 is an aberration diagram of Example 3.
  • FIG. 6 is an aberration diagram of Example 4.
  • FIG. 6 is an aberration diagram of Example 5.
  • FIG. 10 is an aberration diagram of Example 6.
  • FIG. 10 is an aberration diagram of Example 7.
  • FIG. 10 is an aberration diagram of Example 8.
  • FIG. 10 is an aberration diagram of Example 9.
  • FIG. 10 is an aberration diagram of Example 10.
  • FIG. 10 shows aberration diagrams of Example 11.
  • FIG. 10 is an aberration diagram of Example 12.
  • Aberration diagram of Example 13 The lens block diagram of 14th Embodiment (Example 14).
  • FIG. 18 shows aberration diagrams of Example 15.
  • Aberration diagram of Example 16 The lens block diagram of 17th Embodiment (Example 17).
  • the schematic diagram which shows the schematic structural example of the digital apparatus carrying a far-infrared lens system.
  • the far-infrared lens system according to the present invention is a lens system used in the far-infrared band, and in order from the object side, a first lens having a negative power, a second lens having a positive power, and a positive lens It consists of three single lenses with a third lens that has power (power: an amount defined by the reciprocal of the focal length), satisfies the following conditional expression (1), and has a half angle of view ⁇ of 30 ° It is also characterized by being large. 3.2 ⁇ f2 / f ⁇ 17 (1) However, f2: focal length of the second lens, f: focal length of the entire far-infrared lens system, It is.
  • Far infrared rays are mainly infrared rays having a wavelength in the range of 7 to 14 ⁇ m.
  • the body temperature of humans and animals is emitted light having a wavelength of 8 to 12 ⁇ m, and most of the far infrared optical system is used at a wavelength of 8 to 12 ⁇ m.
  • the far-infrared region with a wavelength of 8 to 12 ⁇ m is the range in which the temperature of a substance can be detected, and there are many things that can be applied, such as temperature measurement, human detection in the dark, and security.
  • far-infrared sensor manufacturing technology has advanced, and inexpensive thermopiles, uncooled microbolometers, and the like have been manufactured, and an inexpensive lens system that is compatible with these is desired.
  • a lineup of far-infrared lens systems applicable to various fields is also desired, and in particular, a wide-angle lens system having a half angle of view ⁇ larger than 30 ° is required.
  • peripheral light amount ratio the image plane by the axial light beam.
  • the decrease in the peripheral light amount ratio due to the angle of view is known as the cosine fourth law (cosine fourth law).
  • cosine fourth law the angle of the light beam incident on the lens system is ⁇ , and the ratio of the light amount to the axis.
  • it decreases to the fourth power of cos ⁇ (theoretical value).
  • the distance from the object to the lens is off-axis and cos ⁇ times on the axis, and the amount of light decreases in proportion to the square of the object distance.
  • the entrance pupil area in the case of an ideal lens
  • the area is reduced by a factor of cos ⁇ and the amount of incident light is reduced.
  • the image plane arrival angle in the case of an ideal lens
  • the amount of light when the lens reaches obliquely decreases by a factor of cos ⁇ .
  • it is reduced to the fourth power of cos ⁇ .
  • the difference in the object distance between the on-axis and the off-axis, the entrance pupil area viewed obliquely, and the oblique incidence of the off-axis light beam on the image plane are combined to reduce the amount of light corresponding to the cos 4th power of the angle of view. .
  • the peripheral light quantity ratio is 56% or less even when the aperture efficiency is 100%, and in a lens system with a wider angle, it is less than 50%. Since the far-infrared lens system detects heat, a decrease in the peripheral light amount ratio is detected by the far-infrared sensor as a pseudo heat amount decrease.
  • the resolution with respect to the temperature change differs between the on-axis and the periphery by performing the correction. This difference becomes more significant as the angle of view of the lens system becomes wider. Particularly, when the half angle of view ⁇ is larger than 30 °, sufficient resolution cannot be obtained for use as a thermo camera for measuring temperature.
  • the half field angle ⁇ of the far-infrared lens system is larger than 30 ° in order to enable application to various fields.
  • Most conventional far-infrared sensors are expensive and can accurately display temperature resolution.
  • non-cooled sensors such as microbolometers that do not require cooling can be manufactured at low cost. Therefore, even a far-infrared lens system having a wide angle of half field angle ⁇ greater than 30 ° can be realized.
  • the reason why the first lens has negative power is to secure a sufficient lens back with a wide-angle lens system in which the half angle of view ⁇ is larger than 30 °.
  • a cover glass is disposed and sealed in front of the light receiving surface to maintain the resolving power, and a vacuum is formed between the light receiving surface and the cover glass. For this reason, a space is required between the light receiving surface and the lens.
  • the principal point can be brought behind the final surface of the lens system, and a sufficient lens back can be secured even at a wide angle.
  • the off-axis luminous flux width is set. It is possible to keep the lens system wide behind the lens system, and a lens system having a peripheral light amount ratio of 50% or more can be realized even with a lens system having a half angle of view ⁇ wider than 30 °.
  • f2 / f larger than the lower limit of conditional expression (1), it becomes possible to keep the off-axis luminous flux width large to the rear of the lens system, the half angle of view ⁇ is larger than 30 °, and distortion is caused.
  • the peripheral light amount ratio can be brightened to 50% or more.
  • the angle at which the off-axis chief ray reaches the image plane can be made nearly vertical, an effect of increasing the peripheral light amount ratio can be obtained.
  • the power of the third lens can be prevented from becoming too strong, and the coma aberration of the off-axis light beam can be suppressed to provide a high-performance lens system.
  • the arrival angle of the off-axis principal ray on the image plane can be prevented from being swung from the vertical direction to the reverse direction, and the light quantity ratio can be kept high.
  • a bright and high-performance far-infrared lens system capable of obtaining a peripheral light quantity ratio of 50% or more while having a distortion within ⁇ 5% and a half angle of view ⁇ larger than 30 °, This can be realized with a small number of three, and a wide-angle far-infrared lens system suitable for a thermocamera that requires temperature detection can be provided at low cost. Therefore, it is possible to realize an inexpensive but high-performance far-infrared lens system and an imaging optical device including the same.
  • the far-infrared lens system for camera systems such as digital cameras, surveillance cameras, security cameras, and in-vehicle cameras, or by using imaging optical devices for digital devices such as portable terminals, night vision devices, and thermography, It is possible to realize a high-performance far-infrared image input function at a low cost and in a compact manner, contributing to its compactness, high performance, and high functionality.
  • the following describes how to obtain these effects in a well-balanced manner, as well as setting conditions for achieving higher optical performance, securing a peripheral light amount ratio, widening the angle, downsizing, and the like.
  • conditional expression (1a) it is desirable to satisfy the following conditional expression (1a), and it is more desirable to satisfy the conditional expression (1b).
  • conditional expression (1a) and (1b) define more preferable condition ranges based on the above viewpoints, etc., among the condition ranges defined by the conditional expression (1). Therefore, the above effect can be further enhanced by preferably satisfying conditional expression (1a), more preferably satisfying conditional expression (1b).
  • the peripheral light quantity ratio can be further increased by exceeding the lower limit of the conditional expression (1a) or (1b).
  • the first lens is preferably made of a material having a refractive index larger than 2.9 at a wavelength of 10 ⁇ m.
  • the refractive index is the ratio of the traveling speed of light in the material to the vacuum, and is displayed for the d-line (587 nm) in the visible region.
  • the refractive index for a wavelength of 10 ⁇ m is typically representative.
  • Zinc halide 2.407 or the like. Furthermore, sodium chloride (NaCl) or potassium bromide (KBr) having a refractive index of around 1.5, metallic materials having a refractive index larger than 2.9, and the like are included, and there are many variations in the refractive index.
  • the curvature of the lens surface can be relaxed. For this reason, even when the off-axis light beam passes through a high position from the optical axis, the coma aberration is suppressed to be small, and the distortion is also suppressed to be not greatly negative. Therefore, a lens system with good optical performance can be realized.
  • the first lens can be disposed relatively apart, the pupil size of the off-axis light beam can be controlled.
  • the distance between the first lens and the second lens can be made longer than before, so that the first lens Due to the effect of expanding the pupil of the off-axis light beam passing through a high position, it becomes possible to realize a lens system having a higher peripheral light amount ratio.
  • the first lens has a negative meniscus shape with a convex surface facing the object side.
  • the off-axis light beam passes through a high position from the optical axis.
  • the pupil becomes larger as it is off-axis, so that the peripheral light amount ratio can be effectively increased.
  • conditional expression (2) It is desirable to satisfy the following conditional expression (2), and it is further desirable to satisfy the conditional expression (2) using a negative meniscus lens having a convex surface facing the object side as the first lens. 3.0 ⁇ d2 / f ⁇ 9.0 (2) However, d2: axial distance between the image side surface of the first lens and the object side surface of the second lens, f: focal length of the entire far-infrared lens system, It is.
  • the peripheral light amount ratio can be further increased.
  • d2 / f is made larger than the lower limit of conditional expression (2), the off-axis light beam passes through a high position from the optical axis of the first lens.
  • the object side surface of the first lens has a strong convex shape, the local refractive power is stronger than on the axis at a position higher than the optical axis of the convex surface. For this reason, it is possible to increase the pupil diameter with respect to the off-axis light beam, and the effect of increasing the peripheral light amount ratio is given, so that the peripheral light amount ratio can be effectively increased to 50% or more.
  • conditional expression (2a) defines a more preferable condition range based on the above viewpoints, etc., among the condition ranges defined by the conditional expression (2). Therefore, the above effect can be further increased preferably by satisfying conditional expression (2a). For example, the peripheral light amount ratio can be further increased by exceeding the lower limit of the conditional expression (2a).
  • the second lens has a positive meniscus shape or plano-convex shape with a convex surface facing the object side. Since the first lens has negative power, the light flux is converged for the first time by the second lens. By converging the light beam on the first surface of the second lens, it is possible to suppress the spherical aberration and the curvature of field without reducing the light beam width too much.
  • the second lens can have a strong positive power.
  • the second lens needs to have a strong power. There is not much sex.
  • the power of the second lens is not so strong, if the object side surface is first given a positive power as described above, the image side surface is inevitably weakened to correct spherical aberration and field curvature. Or it has weak negative power.
  • a material having a higher refractive index has a smaller surface curvature and a smaller aberration
  • a material having a higher refractive index than 2.9, such as Ge and Si is used in each of the examples described later.
  • a design using a lens material having a low refractive index there is a case where it is necessary to give positive power to both surfaces even if the power of the second lens is within the range of the conditional expression (1). Conceivable.
  • the object side of the first lens is also conceivable as the position where the aperture is placed.
  • the diaphragm is placed on the object side of the first lens, if the off-axis light beam is incident obliquely, the pupil is reduced by cos times the incident angle, even if there is no vignetting by the lens, and the peripheral light quantity ratio is reduced. Resulting in.
  • the stop closer to the image side than the first lens the first lens or the first lens and the second lens can increase the pupil diameter with respect to the off-axis light beam, and the peripheral light amount ratio is increased. It becomes.
  • the position of the stop is set to be the second lens than 1/2 of the interval between the first lens and the second lens. It is more preferable to be close to.
  • the third lens has a biconvex shape in which the convex surface with the higher power is directed toward the object side when comparing both surfaces, or a positive meniscus shape with the convex surface directed toward the object side.
  • the shape of the third lens having a relatively strong positive power is a biconvex shape in which the strong convex surface of both convex surfaces having positive power faces the object side, or the convex surface faces the object side.
  • a positive meniscus shape is desirable.
  • the positive power concentrates behind the lens system.
  • the lens system is larger than 30 ° and has a wide angle and a short focal length.
  • f23 / f smaller than the upper limit of conditional expression (3), a short focal length can be realized, and a lens system with a small front lens diameter can be obtained even at a wide angle so that the total lens length does not become too large. This is possible, and the configuration is such that off-axis coma and distortion are reduced.
  • f23 / f larger than the lower limit of conditional expression (3), it is possible to prevent the positive power concentrated behind the lens system from becoming too strong, and to reduce spherical aberration and curvature of field. It becomes.
  • conditional expression (3a) It is more desirable to satisfy the following conditional expression (3a). 2.0 ⁇ f23 / f ⁇ 2.7 (3a)
  • This conditional expression (3a) defines a more preferable condition range based on the above viewpoints, etc., among the condition ranges defined by the conditional expression (3). Therefore, the above effect can be further increased preferably by satisfying conditional expression (3a).
  • the power ratio f2 / f3 between the second lens and the third lens is set within a predetermined range so as to satisfy the conditional expression (4), an off-axis principal ray image plane that is closely related to the peripheral light amount ratio is obtained. It is possible to control the angle of arrival. For this reason, even if the half angle of view ⁇ is a wide angle of 30 ° or more and the distortion is within ⁇ 5%, it is possible to obtain a configuration in which the peripheral light amount ratio is sufficiently secured.
  • the peripheral light amount ratio and the angle of light rays reaching the image plane have a deep relationship as indicated by the cos 4th law. That is, if the light rays reaching the image plane are close to vertical, the decrease in the peripheral light amount ratio can be reduced.
  • the off-axis light beam is refracted behind the lens system, and the off-axis principal ray reaches at an angle close to the image plane.
  • the arrival angle of the off-axis principal ray on the image plane can be prevented from deviating from vertical in the reverse direction. Further, the configuration is such that the off-axis coma aberration is reduced by preventing the third lens power from becoming too strong.
  • the aperture image is formed at a position far from the light receiving surface, so that ghosting due to the aperture can be prevented, which is suitable for a far infrared camera. It becomes a lens type.
  • conditional expression (4a) defines a more preferable condition range based on the above viewpoints, etc., among the condition ranges defined by the conditional expression (4). Therefore, the above effect can be further increased preferably by satisfying conditional expression (4a). For example, when the lower limit of conditional expression (4a) is exceeded, the off-axis principal ray arrives at an angle that is closer to the image plane, and the reduction in the peripheral light amount ratio can be further reduced.
  • At least one of the second lens and the third lens is made of a material having a refractive index larger than 2.9 at a wavelength of 10 ⁇ m.
  • the dispersion ⁇ at a wavelength of 8 to 12 ⁇ m is defined by the following formula (FD)
  • FD dispersion ⁇ of the lens material constituting at least one of the first to third lenses
  • ⁇ (N10-1) / (N8-N12) (FD)
  • N8 refractive index at a wavelength of 8 ⁇ m
  • N10 refractive index at a wavelength of 10 ⁇ m
  • N12 refractive index at a wavelength of 12 ⁇ m
  • the Abbe number ⁇ d of d-line is used for visible light.
  • Nd the refractive index at the d-line
  • Nf the refractive index at the F-line
  • Nc the refractive index at the C-line. Rate.
  • aberration correction may be performed using a diffraction grating as long as the peripheral light amount ratio is not significantly reduced.
  • a diffraction grating By providing a diffraction grating, it is possible to satisfactorily correct axial chromatic aberration and the like.
  • a cross-sectional shape of the diffraction grating a step shape or a kinoform may be used in addition to the binary shape.
  • the far-infrared lens system according to the present invention is suitable as an imaging lens system for a far-infrared camera system.
  • the reason why there are few wide-angle lenses in the conventional far-infrared lens system is considered to be that the peripheral light amount ratio is lowered by the angle of view as described above.
  • a simple three-lens lens system as described above a lens system having a high peripheral light amount ratio can be obtained even at a wide angle.
  • an inexpensive system that can be used for a thermocamera even at a wide angle can be configured.
  • far-infrared lens systems or imaging optical devices for digital devices such as night vision devices, thermography, portable terminals, camera systems (for example, digital cameras, surveillance cameras, security cameras, in-vehicle cameras) makes high performance for digital devices.
  • a far-infrared image input function with high performance can be added at a low cost and in a compact manner, contributing to the compactness, high performance, high functionality, and the like.
  • One of the reasons why far-infrared cameras are not widespread is that the lens material and lens processing are expensive. Therefore, by using a simple three-lens lens system as the far-infrared lens system, Therefore, it is possible to realize an inexpensive camera system.
  • the far-infrared lens system according to the present invention is suitable for use as an imaging optical system for a digital device with a far-infrared image input function (for example, a portable terminal, a drive recorder, etc.). By combining them, it is possible to configure a far-infrared imaging optical device that optically captures a far-infrared image of a subject and outputs it as an electrical signal.
  • the imaging optical device is an optical device that constitutes a main component of a camera used for still image shooting or moving image shooting of a subject. For example, a far-infrared ray that forms a far-infrared optical image of an object in order from the object (that is, subject) side.
  • It comprises a lens system and a far infrared sensor (imaging device) that converts a far infrared optical image formed by the far infrared lens system into an electrical signal.
  • the far-infrared lens system having the above-described characteristic configuration is arranged so that the far-infrared optical image of the subject is formed on the light-receiving surface (that is, the imaging surface) of the far-infrared sensor. Therefore, it is possible to realize an imaging optical device having high performance and a digital device including the same.
  • Examples of digital devices with a far-infrared image input function include camera systems such as infrared cameras, surveillance cameras, security cameras, in-vehicle cameras, aircraft cameras, digital cameras, video cameras, videophone cameras, and personal computers. , Night vision devices, thermography, portable digital devices (for example, small and portable information device terminals such as mobile phones, smart phones (high-function mobile phones), tablet terminals, mobile computers, etc.), and peripheral devices (scanners, printers) , Mouse, etc.), other digital devices (drive recorders, defense devices, etc.), etc., which have a camera function built in or externally mounted.
  • camera systems such as infrared cameras, surveillance cameras, security cameras, in-vehicle cameras, aircraft cameras, digital cameras, video cameras, videophone cameras, and personal computers.
  • Night vision devices thermography
  • portable digital devices for example, small and portable information device terminals such as mobile phones, smart phones (high-function mobile phones), tablet terminals, mobile computers, etc.
  • peripheral devices scanners, printers
  • an infrared camera system by using an imaging optical device for far infrared rays, but also to provide an infrared camera function and a night vision function by installing the imaging optical device in various devices.
  • a temperature measurement function can be added.
  • a digital device having a far-infrared image input function such as a smartphone with an infrared camera can be configured.
  • FIG. 35 shows a schematic configuration example of the digital device DU in a schematic cross section.
  • the imaging optical device LU mounted on the digital device DU shown in FIG. 35 is a far-infrared lens system LN (AX: light) that forms a far-infrared optical image (image plane) IM of an object in order from the object (that is, subject) side.
  • Axis and a far infrared sensor (imaging device) SR that converts an optical image IM formed on the light receiving surface (imaging surface) SS by the far infrared lens system LN into an electrical signal.
  • the imaging optical device LU On the image plane IM side of the far-infrared lens system LN, the cover glass of the far-infrared sensor SR, an optical filter arranged as necessary, and the like are positioned as parallel plates (not shown).
  • the imaging optical device LU When a digital device DU with an image input function is constituted by this imaging optical device LU, the imaging optical device LU is usually arranged inside the body, but when necessary to realize the camera function, a form as necessary is adopted. Is possible.
  • the unitized imaging optical device LU can be configured to be detachable or rotatable with respect to the main body of the digital device DU.
  • the far-infrared lens system LN is a three-lens single focal point lens composed of three lenses of the first to third lenses in order from the object side.
  • the light-receiving surface SS of the far-infrared sensor SR As described above, the light-receiving surface SS of the far-infrared sensor SR.
  • An optical image IM composed of far infrared rays is formed on the top.
  • the far-infrared sensor SR for example, a far-infrared image sensor (thermosensor or the like) having a plurality of pixels (for example, several thousand to several hundred thousand pixels) and using a wavelength of about 8 to 12 ⁇ m is used.
  • the far-infrared lens system LN is provided so that the optical image IM of the subject is formed on the light receiving surface SS which is a photoelectric conversion unit of the far-infrared sensor SR, the optical image formed by the far-infrared lens system LN. IM is converted into an electrical signal by the far-infrared sensor SR.
  • the far infrared sensor SR include a pyroelectric sensor, a microbolometer, and a thermopile.
  • the pyroelectric sensor uses a pyroelectric effect in which ceramic containing lead zirconate titanate or the like spontaneously polarizes due to a change in temperature. In most cases, the pyroelectric sensor has a single light receiving surface and is an inexpensive temperature sensor.
  • the microbolometer is a temperature sensor that has a light receiving surface in which heat sensitive materials such as amorphous silicon and vanadium oxide are two-dimensionally arranged by a microfabrication technique and detects a change in resistance value due to a temperature rise.
  • thermopile is a temperature sensor that uses thermocouples capable of converting heat into electric energy in series or in parallel to form a sensor surface, and is the second cheapest sensor after a pyroelectric sensor.
  • the digital device DU includes a signal processing unit 1, a control unit 2, a memory 3, an operation unit 4, a display unit 5 and the like in addition to the imaging optical device LU.
  • the signal generated by the far-infrared sensor SR is subjected to predetermined digital image processing, image compression processing, and the like as required by the signal processing unit 1 and recorded as a digital video signal in the memory 3 (semiconductor memory, optical disk, etc.).
  • the signal is transmitted to another device via a cable or converted into an infrared signal or the like (for example, a communication function of a mobile phone).
  • the control unit 2 is composed of a microcomputer, and performs control of functions such as a photographing function (still image photographing function, moving image photographing function, etc.), an image reproduction function, and the like; and a lens moving mechanism for focusing.
  • the control unit 2 controls the imaging optical device LU so as to perform at least one of still image shooting and moving image shooting of a subject.
  • the display unit 5 includes a display such as a liquid crystal monitor, and performs image display using an image signal converted by the far infrared sensor SR or image information recorded in the memory 3.
  • the operation unit 4 is a part including operation members such as an operation button (for example, a release button) and an operation dial (for example, a shooting mode dial), and transmits information input by the operator to the control unit 2.
  • FIGS. 1, 3,..., 31 and 33 show first to seventeenth embodiments of the far-infrared lens system LN in an infinitely focused state in optical cross sections.
  • the far-infrared lens system LN includes, in order from the object side, a first lens L1 having negative power, a second lens L2 having positive power, and a third lens L3 having positive power. It consists of.
  • a parallel plate PT corresponding to the protective cover glass of the far infrared sensor SR is disposed on the image plane IM side of each far infrared lens system LN.
  • the far-infrared lens system LN of the first and eighth embodiments includes, in order from the object side, a negative power first lens L1, an aperture stop ST, and a positive power second lens L2. And a third lens L3 having a positive power.
  • the first lens L1 is a negative meniscus lens convex toward the object side
  • the second lens L2 is a positive meniscus lens convex toward the object side
  • the third lens L3 is A positive meniscus lens convex toward the object side.
  • the object side surface of the first lens L1, the object side surface of the second lens L2, and the image side surface of the third lens L3 are aspheric.
  • the far-infrared lens systems LN of the second to seventh, tenth, and eleventh embodiments in order from the object side, the first lens L1 having a negative power, the aperture stop ST, , A positive power second lens L2 and a positive power third lens L3.
  • the first lens L1 is a negative meniscus lens convex toward the object side
  • the second lens L2 is a positive meniscus lens convex toward the object side
  • the third lens L3 is A positive meniscus lens convex toward the object side.
  • the object side surface of the first lens L1, the object side surface of the second lens L2, and both surfaces of the third lens L3 are aspherical surfaces.
  • the second lens L2 in the eleventh embodiment can be said to have a plano-convex shape because the image side surface has a meniscus shape close to a planar shape.
  • the object side surface of the first lens L1 is an aspheric surface for each zone.
  • the far-infrared lens systems LN of the ninth, twelfth, and thirteenth embodiments are, in order from the object side, the negative lens first lens L1, the aperture stop ST, and the positive power first lens L1.
  • the first lens L1 is a negative meniscus lens convex toward the object side
  • the second lens L2 is a positive meniscus lens convex toward the object side
  • the third lens L3 is A positive meniscus lens convex toward the object side.
  • Both sides of the first lens L1, both sides of the second lens L2, and the image side surface of the third lens L3 are aspheric.
  • the far-infrared lens system LN of the fourteenth to sixteenth embodiments includes, in order from the object side, a negative power first lens L1, an aperture stop ST, a positive power second lens L2, And a third lens L3 having a positive power.
  • the first lens L1 is a negative meniscus lens convex toward the object side
  • the second lens L2 is a positive meniscus lens convex toward the object side
  • the third lens L3 is It is a biconvex positive lens. Both sides of the first lens L1, both sides of the second lens L2, and the image side surface of the third lens L3 are aspheric.
  • the far-infrared lens system LN includes, in order from the object side, a negative lens first lens L1, a positive power second lens L2, an aperture stop ST, and a positive power third lens. And a lens L3.
  • the first lens L1 is a negative meniscus lens convex toward the object side
  • the second lens L2 is a positive meniscus lens convex toward the object side
  • the third lens L3 is A positive meniscus lens convex toward the object side.
  • the second lens L2 can be said to have a plano-convex shape because the image side surface has a meniscus shape close to a planar shape.
  • the image side surface of the second lens L2 forms an aperture stop ST at the edge portion.
  • Both sides of the first lens L1, both sides of the second lens L2, and the image side surface of the third lens L3 are aspheric.
  • Examples 1 to 17 (EX1 to 17) listed here are numerical examples corresponding to the first to seventeenth embodiments, respectively, and are lens configuration diagrams showing the first to seventeenth embodiments. (FIG. 1, FIG. 3,..., FIG. 33) show optical configurations such as the lens cross-sectional shape and lens arrangement of the corresponding Examples 1 to 17, respectively.
  • the surface with * in the surface number i is an aspheric surface, and the surface shape is defined by the following formula (AS) using a local orthogonal coordinate system (x, y, z) with the surface vertex as the origin.
  • z (c ⁇ h 2 ) / [1 + ⁇ ⁇ 1 ⁇ (1 + K) ⁇ c 2 ⁇ h 2 ⁇ ] + ⁇ (Aj ⁇ h j ) (AS)
  • z the amount of sag in the direction of the optical axis AX at the position of the height h (based on the surface vertex)
  • c curvature at the surface vertex (reciprocal of paraxial radius of curvature r)
  • K conic constant
  • Aj j-order aspheric coefficient ( ⁇ represents the sum of the fourth to ⁇ orders for j), It is.
  • the aspheric surface for each zone is also expressed by the above formula (AS) in the same way as a normal aspheric surface.
  • the radius of curvature R (mm) and the aspherical coefficient Aj take different values for each zone according to the height h (mm) from the optical axis AX, and j is a zero-order and fourth-order or higher natural number of a constant term. take.
  • the refractive index and dispersion data of the optical material constituting each lens are as follows: Show.
  • the parallel plate PT in front of the image plane IM is a silicon protective plate (cover glass) of the far-infrared sensor SR.
  • the spherical aberration diagram (A) shows the amount of spherical aberration at a design wavelength (evaluation wavelength) of 10000 nm indicated by a solid line, the amount of spherical aberration at a wavelength of 8000 nm indicated by an alternate long and short dash line, and the amount of spherical aberration at a wavelength of 12000 nm indicated by a broken line.
  • the vertical axis represents a value obtained by normalizing the incident height to the pupil by the maximum height (that is, the relative pupil height).
  • the broken line T is the tangential image plane at the design wavelength of 10000 nm
  • the solid line S is the sagittal image plane at the design wavelength of 10000 nm
  • the vertical axis represents the image height (IMG HT, mm).
  • the horizontal axis represents distortion (%) at a design wavelength of 10,000 nm
  • the vertical axis represents image height (IMG HT, mm).
  • the maximum value of the image height IMG HT corresponds to half the diagonal length of the light receiving surface SS of the far infrared sensor SR.
  • Example 1 Unit mm Surface data i r (mm) d (mm) N10 ⁇ OB INFINITY INFINITY 1 * 19.97442 4.259916 4.004 1251 2 11.34338 24.142077 3 (ST) INFINITY 0.500000 4 * 30.58615 1.500000 4.004 1251 5 63.48804 12.450600 6 18.06938 7.000000 4.004 1251 7 * 33.47349 3.247407 8 INFINITY 1.000000 3.4178 1860 9 INFINITY 0.900000 IM INFINITY 0.000000
  • Example 2 Unit mm Surface data i r (mm) d (mm) N10 ⁇ OB INFINITY INFINITY 1 * 18.98745 3.933550 4.004 1251 2 11.39073 21.941429 3 (ST) INFINITY 3.188808 4 * 31.63379 1.500000 4.004 1251 5 61.27521 12.046530 6 * 18.51782 7.000000 4.004 1251 7 * 40.54304 3.489683 8 INFINITY 1.000000 3.4178 1860 9 INFINITY 0.900001 IM INFINITY 0.000000
  • Example 3 Unit mm Surface data i r (mm) d (mm) N10 ⁇ OB INFINITY INFINITY 1 * 18.98745 3.937538 4.004 1251 2 11.26822 22.848958 3 (ST) INFINITY 1.946879 4 * 31.24766 1.500000 4.004 1251 5 59.99565 12.389216 6 * 17.88176 7.000000 4.004 1251 7 * 35.04051 3.477409 8 INFINITY 1.000000 3.4178 1860 9 INFINITY 0.899996 IM INFINITY 0.000000
  • Example 4 Unit mm Surface data i r (mm) d (mm) N10 ⁇ OB INFINITY INFINITY 1 * 18.98128 3.937538 4.004 1251 2 11.25300 22.848958 3 (ST) INFINITY 1.946879 4 * 32.38273 1.500000 4.004 1251 5 64.92274 12.389216 6 * 17.92470 7.000000 4.004 1251 7 * 35.04051 3.477409 8 INFINITY 1.000000 3.4178 1860 9 INFINITY 0.899995 IM INFINITY 0.000000
  • Example 5 Unit mm Surface data i r (mm) d (mm) N10 ⁇ OB INFINITY INFINITY 1 * 18.95171 3.937538 4.004 1251 2 11.21692 22.848958 3 (ST) INFINITY 1.946879 4 * 32.51597 1.500000 4.004 1251 5 65.92705 12.389216 6 * 17.97350 7.000000 4.004 1251 7 * 35.04051 3.477409 8 INFINITY 1.000000 3.4178 1860 9 INFINITY 0.900000 IM INFINITY 0.000000
  • Example 6 Unit mm Surface data i r (mm) d (mm) N10 ⁇ OB INFINITY INFINITY 1 * 18.95450 3.937538 4.004 1251 2 11.23809 22.848958 3 (ST) INFINITY 1.946879 4 * 33.05246 1.500000 4.004 1251 5 67.89601 12.389216 6 * 17.93397 7.000000 4.004 1251 7 * 35.04051 3.477409 8 INFINITY 1.000000 3.4178 1860 9 INFINITY 0.900000 IM INFINITY 0.000000
  • Zone 1 Zone 1 (0 ⁇ h ⁇ 1.5)
  • A4 2.0606E-04
  • A6 -9.5905E-05
  • A8 1.4866E-05 Zone 2 (1.5 ⁇ h ⁇ 8.0)
  • A8 4.9068E-11 Zone 3 (8.0 ⁇ h)
  • A8 2.3819E-10
  • Example 7 Unit mm Surface data i r (mm) d (mm) N10 ⁇ OB INFINITY INFINITY 1 * 18.98744 3.263229 4.004 1251 2 11.95292 23.301818 3 (ST) INFINITY 3.628419 4 * 22.64137 1.500000 4.004 1251 5 33.26157 11.303538 6 * 17.80384 6.518600 4.004 1251 7 * 35.04051 3.584397 8 INFINITY 1.000000 3.4178 1860 9 INFINITY 0.900018 IM INFINITY 0.000000
  • Example 8 Unit mm Surface data i r (mm) d (mm) N10 ⁇ OB INFINITY INFINITY 1 * 19.28986 4.067793 3.4178 1860 2 10.86650 20.951878 3 (ST) INFINITY 7.291065 4 * 19.72855 1.500000 3.4178 1860 5 34.10096 10.213553 6 17.43825 5.567141 3.4178 1860 7 * 44.22484 3.508571 8 INFINITY 1.000000 3.4178 1860 9 INFINITY 0.900420 IM INFINITY 0.000000
  • Example 9 Unit mm Surface data i r (mm) d (mm) N10 ⁇ OB INFINITY INFINITY 1 * 18.98744 4.338460 3.4178 1860 2 * 10.58949 19.728667 3 (ST) INFINITY 0.500000 4 * 17.26847 1.899319 3.4178 1860 5 * 26.38188 7.365513 6 16.63593 7.000000 3.4178 1860 7 * 71.59766 2.918293 8 INFINITY 1.000000 3.4178 1860 9 INFINITY 0.900000 IM INFINITY 0.000000
  • Example 10 Unit mm Surface data i r (mm) d (mm) N10 ⁇ OB INFINITY INFINITY 1 * 22.09903 2.000000 4.004 1251 2 15.10708 27.821632 3 (ST) INFINITY 6.655555 4 * 22.64186 1.500 160 4.004 1251 5 29.55163 11.833675 6 * 20.26530 7.908087 4.004 1251 7 * 45.21025 4.054555 8 INFINITY 1.000000 3.4178 1860 9 INFINITY 0.910996 IM INFINITY 0.000000
  • Example 11 Unit mm Surface data i r (mm) d (mm) N10 ⁇ OB INFINITY INFINITY 1 * 18.72159 7.000000 4.004 1251 2 8.68331 17.091768 3 (ST) INFINITY 0.500000 4 * 37.85306 7.000000 4.004 1251 5 2247.90524 8.688493 6 * 13.95820 1.515826 4.004 1251 7 * 28.79085 3.541168 8 INFINITY 1.000000 3.4178 1860 9 INFINITY 0.899200 IM INFINITY 0.000000
  • Example 12 Unit mm Surface data i r (mm) d (mm) N10 ⁇ OB INFINITY INFINITY 1 * 18.98747 5.077222 3.4178 1860 2 * 10.15611 17.724169 3 (ST) INFINITY 0.500000 4 * 18.97666 1.952454 3.4178 1860 5 * 31.84518 6.794438 6 16.53191 6.952777 3.4178 1860 7 * 90.71964 2.879810 8 INFINITY 1.000000 3.4178 1860 9 INFINITY 0.900078 IM INFINITY 0.000000
  • Example 13 Unit mm Surface data i r (mm) d (mm) N10 ⁇ OB INFINITY INFINITY 1 * 15.08506 3.774564 3.4178 1860 2 * 9.21001 16.941609 3 (ST) INFINITY 0.500000 4 * 25.58510 4.521797 3.4178 1860 5 * 53.02554 8.801469 6 17.86752 7.000000 3.4178 1860 7 * 55.36084 3.180317 8 INFINITY 1.000000 3.4178 1860 9 INFINITY 1.381468 IM INFINITY 0.000000
  • Example 14 Unit mm Surface data i r (mm) d (mm) N10 ⁇ OB INFINITY INFINITY 1 * 18.98744 3.218035 3.4178 1860 2 * 11.32068 22.063256 3 (ST) INFINITY 0.754851 4 * 15.53320 2.536553 3.4178 1860 5 * 16.77402 6.079129 6 26.23256 7.000000 3.4178 1860 7 * -61.42566 3.305275 8 INFINITY 1.000000 3.4178 1860 9 INFINITY 3.045988 IM INFINITY 0.000000
  • Example 15 Unit mm Surface data i r (mm) d (mm) N10 ⁇ OB INFINITY INFINITY 1 * 18.98744 3.089206 3.4178 1860 2 * 11.30298 22.560322 3 (ST) INFINITY 0.500000 4 * 24.07684 6.694275 3.4178 1860 5 * 24.49200 4.479898 6 29.72505 7.000000 3.4178 1860 7 * -40.03624 3.305275 8 INFINITY 1.000000 3.4178 1860 9 INFINITY 3.482869 IM INFINITY 0.000000
  • Example 16 Unit mm Surface data i r (mm) d (mm) N10 ⁇ OB INFINITY INFINITY 1 * 18.98744 2.893883 3.4178 1860 2 * 11.45425 23.077726 3 (ST) INFINITY 0.500000 4 * 34.18158 7.000000 3.4178 1860 5 * 37.66610 4.601597 6 33.24701 7.000000 3.4178 1860 7 * -39.88293 3.305275 8 INFINITY 1.000000 3.4178 1860 9 INFINITY 4.266405 IM INFINITY 0.000000
  • Example 17 Unit mm Surface data i r (mm) d (mm) N10 ⁇ OB INFINITY INFINITY 1 * 19.61551 4.689940 3.4178 1860 2 * 11.19901 22.125190 3 * 26.04935 5.578011 3.4178 1860 4 * 71.54092 0.079921 3 (ST) INFINITY 6.487793 6 18.00186 6.727592 3.4178 1860 7 * 45.70953 2.8613 8 INFINITY 1.000000 3.4178 1860 9 INFINITY 0.900000 IM INFINITY 0.000000

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

Le système de lentille à infrarouge lointain selon la présente invention est un système de lentille utilisé dans la bande infrarouge lointain, et est configuré à partir, dans l'ordre à partir du côté objet, de trois lentilles simples comprenant une première lentille ayant une puissance négative, une deuxième lentille ayant une puissance positive, et une troisième lentille ayant une puissance positive, l'expression conditionnelle 3,2 < f2/f < 17 (où f2 est la distance focale de la deuxième lentille et f est la distance focale du système de lentille à infrarouge lointain dans son ensemble) étant satisfaite, et le demi-angle de champ étant supérieur à 30°.
PCT/JP2016/067491 2015-06-24 2016-06-13 Système de lentille infrarouge lointain, appareil optique d'imagerie et dispositif numérique Ceased WO2016208433A1 (fr)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111856708A (zh) * 2019-04-29 2020-10-30 光芒光学股份有限公司 取像镜头及其制造方法
CN115268022A (zh) * 2022-07-27 2022-11-01 中锗科技有限公司 一种牢靠型红外光学无热化镜头
CN115356827A (zh) * 2022-08-10 2022-11-18 安徽光智科技有限公司 一种超短焦消热差红外镜头

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012066750A1 (fr) * 2010-11-15 2012-05-24 富士フイルム株式会社 Objectif de prise d'image et dispositif de prise d'image
JP2012234099A (ja) * 2011-05-06 2012-11-29 Kyocera Corp 撮像レンズ
JP2013228539A (ja) * 2012-04-25 2013-11-07 Tamron Co Ltd 赤外線用光学系

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012066750A1 (fr) * 2010-11-15 2012-05-24 富士フイルム株式会社 Objectif de prise d'image et dispositif de prise d'image
JP2012234099A (ja) * 2011-05-06 2012-11-29 Kyocera Corp 撮像レンズ
JP2013228539A (ja) * 2012-04-25 2013-11-07 Tamron Co Ltd 赤外線用光学系

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111856708A (zh) * 2019-04-29 2020-10-30 光芒光学股份有限公司 取像镜头及其制造方法
CN115268022A (zh) * 2022-07-27 2022-11-01 中锗科技有限公司 一种牢靠型红外光学无热化镜头
CN115356827A (zh) * 2022-08-10 2022-11-18 安徽光智科技有限公司 一种超短焦消热差红外镜头

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