KR101826840B1 - Omnidirectional optical system and photographing apparatus - Google Patents

Abstract

Disclosed are an omnidirectional optical system, and a photographing apparatus having the same. The disclosed omnidirectional optical system comprises: a first reflection unit having a through-hole; a second reflection unit arranged to face the through-hole, and receiving light reflected from the first reflection unit; and a lens system having at least one lens receiving light reflected from the second reflection unit to transmit the light to an image sensor.

Description

Technical Field [0001] The present invention relates to an omnidirectional optical system and a photographing apparatus,

Various embodiments relate to an omnidirectional optical system capable of 360 degree photographing and a photographing apparatus including the omnidirectional optical system.

Generally, a camera is mounted on a CCTV, a mobile communication terminal, a computer, a notebook, and a vehicle so that the user can view the surrounding video information or take a picture. It is required that cameras have small size and light weight and high image quality in accordance with the tendency of slimming of mobile communication terminals and the trend of miniaturization of computers and notebooks. In order to prevent the aesthetics from being hindered even in the case of a vehicle camera or the like regardless of the driver's view, a small-sized, lightweight and high-quality camera is required. In addition, such a camera should have a large angle of view to obtain as wide a range of image information as possible.
Prior art documents include Japanese Patent Application Laid-Open No. 2005-091423 and Japanese Patent Application Laid-Open No. 2005-091424.

Various embodiments provide an optical system that can be photographed in all directions.

Various embodiments provide a photographing apparatus capable of panoramic photographing.

In the omnidirectional optical system according to the exemplary embodiment,

A first reflector having a through-hole;

A second reflecting portion disposed to face the through hole and receiving light reflected by the first reflecting portion; And

And a lens system including at least one lens for receiving light reflected by the second reflecting unit and transmitting light to the image sensor,

It has an angle of view of 90 degrees or more.

The first reflecting part may include a spherical mirror.

The second reflective portion may include a planar mirror.

The omnidirectional optical system may satisfy the following expression.

<Expression>

Here, f _refraction is the focal length of the lens system located after the second reflector, and R _mirror represents the radius of curvature of the first reflector.

The omnidirectional optical system may satisfy the following expression.

<Expression>

Here, L _refraction is the distance from the object side of the lens at the most object side of the lens system located after the second reflection unit to the image sensor, and L _mirror represents the distance between the first reflection unit and the second reflection unit.

The omnidirectional optical system may satisfy the following expression.

<Expression>

Here, L _refraction is the distance from the object side of the lens at the most object side of the lens system located after the second reflection unit to the image sensor, and R _mirror represents the radius of curvature of the first reflection unit.

The omnidirectional optical system may satisfy the following expression.

<Expression>

Here, D _refraction represents the largest aperture of the lens system located after the second reflector, and D _{mirror, obs} represents the diameter of the through hole of the first reflector.

At least one of the lenses included in the lens system may have a refractive index of 2.0 or more.

All the lenses included in the lens system may have a refractive index of 2.0 or more.

The lens system may include germanium.

The lens system may include three or more lenses.

The object side surface of the lens closest to the object side of the lens system may have a concave shape.

The lens closest to the object side of the lens system may have a negative refractive power.

A diaphragm may be provided on the object side of the lens on the most image side of the lens system.

The lenses included in the lens system may be configured to be separated from each other without being joined.

The photographing apparatus according to the exemplary embodiment,

Omnidirectional optical system; And

And an image sensor for receiving the light image formed by the omnidirectional optical system,

The omnidirectional optical system according to any one of claims 1 to 3, wherein the omnidirectional optical system includes a first reflecting portion having a through hole, a second reflecting portion disposed to face the through hole and receiving light reflected by the first reflecting portion, And at least one lens for transmitting light to the image sensor, and may have an angle of view of 90 degrees or more.

The omnidirectional optical system according to various embodiments can provide a lens system having a wide angle of view. The omnidirectional optical system according to various embodiments may have a small size and good optical performance. The photographing apparatus according to various embodiments can photograph a high-quality photograph and a moving image produced in a small size, and can perform infrared photographing.

1 shows an omnidirectional optical system of a first embodiment according to an exemplary embodiment.
Fig. 2 shows a spot diagram of the omnidirectional optical system of the first embodiment shown in Fig.
1 shows an omnidirectional optical system of a first embodiment according to an exemplary embodiment.
Fig. 2 shows a spot diagram of the omnidirectional optical system of the first embodiment shown in Fig.
1 shows an omnidirectional optical system of a first embodiment according to an exemplary embodiment.
Fig. 2 shows a spot diagram of the omnidirectional optical system of the first embodiment shown in Fig.
Fig. 3 shows the omnidirectional optical system of the second embodiment according to the exemplary embodiment.
Fig. 4 shows a spot diagram of the omnidirectional optical system of the first embodiment shown in Fig. 3.
5 shows an omnidirectional optical system of a third embodiment according to an exemplary embodiment.
Fig. 6 shows a spot diagram of the omnidirectional optical system of the third embodiment shown in Fig. 5.
Fig. 7 shows an omnidirectional optical system of a fourth embodiment according to an exemplary embodiment.
Fig. 8 shows a spot diagram of the omnidirectional optical system of the fourth embodiment shown in Fig. 7.
Fig. 9 shows an omnidirectional optical system of a fifth embodiment according to an exemplary embodiment.
Fig. 10 shows a spot diagram of the omnidirectional optical system of the fifth embodiment shown in Fig.
11 schematically shows a photographing apparatus including an omnidirectional optical system according to various embodiments.

Hereinafter, an omnidirectional optical system and a photographing apparatus including the omnidirectional optical system according to an exemplary embodiment will be described in detail with reference to the accompanying drawings. It should be understood, however, that this invention is not intended to be limited to the particular embodiments described herein but includes various modifications, equivalents, and / or alternatives of the embodiments of this document . In connection with the description of the drawings, like reference numerals may be used for similar components.

In this document, the expressions "having," " having, "" comprising," or &Quot;, and does not exclude the presence of additional features.

In this document, the expressions "A or B," "at least one of A or / and B," or "one or more of A and / or B," etc. may include all possible combinations of the listed items . For example, "A or B," "at least one of A and B," or "at least one of A or B" includes (1) at least one A, (2) Or (3) at least one A and at least one B all together.

As used herein, the terms "first," "second," "first," or "second," and the like may denote various components, regardless of their order and / or importance, But is used to distinguish it from other components and does not limit the components. For example, the first user equipment and the second user equipment may represent different user equipment, regardless of order or importance. For example, without departing from the scope of the rights described in this document, the first component can be named as the second component, and similarly the second component can also be named as the first component.

(Or functionally or communicatively) coupled with / to "another component (eg, a second component), or a component (eg, a second component) Quot; connected to ", it is to be understood that any such element may be directly connected to the other element or may be connected through another element (e.g., a third element). On the other hand, when it is mentioned that a component (e.g., a first component) is "directly connected" or "directly connected" to another component (e.g., a second component) It can be understood that there is no other component (e.g., a third component) between other components.

As used herein, the phrase " configured to " (or set) to be "configured according to circumstances may include, for example, having the capacity to, To be designed to, "" adapted to, "" made to, "or" capable of ". The term " configured to (or set up) "may not necessarily mean" specifically designed to "in hardware. Instead, in some situations, the expression "configured to" may mean that the device can "do " with other devices or components.

A photographing device according to various embodiments of the present document may be, for example, a smart phone, a tablet personal computer, a mobile phone, a video phone, an e-book reader, A desktop personal computer, a laptop personal computer, a netbook computer, a workstation, a server, a personal digital assistant (PDA), a portable multimedia player (PMP) A medical device, a camera, or a wearable device. According to various embodiments, the wearable device may be of the accessory type (e.g., a watch, a ring, a bracelet, a bracelet, a necklace, a pair of glasses, a contact lens or a head-mounted-device (HMD) (E. G., Electronic apparel), a body attachment type (e. G., A skin pad or tattoo), or a bioimplantable type (e.g., implantable circuit).

In some embodiments, the imaging device may be a home appliance. Home appliances include, for example, televisions, digital video disc (DVD) players, audio, refrigerators, air conditioners, vacuum cleaners, ovens, microwaves, washing machines, air cleaners, set- Such as a home automation control panel, a security control panel, a TV box such as Samsung HomeSync ^TM , Apple TV ^TM or Google TV ^TM , a game console such as Xbox ^TM and PlayStation ^TM , , An electronic key, a camcorder, or an electronic frame.

In another embodiment, the imaging device may be any of a variety of medical devices (e.g., various portable medical measurement devices such as a blood glucose meter, a heart rate meter, a blood pressure meter, or a body temperature meter), a magnetic resonance angiography (MRA) Navigation systems, global navigation satellite systems (GNSS), event data recorders (EDRs), flight data recorders (FDRs), infotainment (infotainment) systems, ) Automotive electronic equipment (eg marine navigation systems, gyro compass, etc.), avionics, security devices, head units for vehicles, industrial or home robots, automatic teller's machines (ATMs) Point of sale, or internet of things (eg, light bulbs, various sensors, electrical or gas meters, sprinkler devices, fire alarms, thermostats, street lights, Of the emitter (toaster), exercise equipment, hot water tank, a heater, boiler, etc.) may include at least one.

According to some embodiments, the imaging device may be a piece of furniture or a part of a building / structure, an electronic board, an electronic signature receiving device, a projector, Water, electricity, gas, or radio wave measuring instruments, etc.). In various embodiments, the imaging device may be a combination of one or more of the various devices described above. The photographing apparatus according to an embodiment may be a flexible photographing apparatus. In addition, the photographing apparatus according to the embodiment of the present document is not limited to the above-described apparatuses, and may include a new photographing apparatus according to technological development.

In this document, the term user may refer to a person using a photographing apparatus or a device using the photographing apparatus (e.g., an artificial intelligence photographing apparatus).

Fig. 1 shows an omnidirectional optical system 100-1 of a first embodiment according to various embodiments.

The omnidirectional optical system 100-1 includes a first reflector R1-1, a second reflector R2-1 that receives light reflected by the first reflector R1-1, And a lens system LS-1 for receiving the light reflected from the light source R2-1. The first reflection part R1-1 may have a through hole H. And the second reflecting portion R2-1 may be arranged to face the through hole H. [ The first reflector R1-1 may be rotationally symmetrical about the through hole H, for example. The first reflector R1-1 may be, for example, a mirror. The first reflector R1-1 may be, for example, a spherical mirror. The through hole H may be provided at the center of the first reflector R1-1 and the second reflector R2-1 may be a flat mirror. The light reflected by the second reflection part R2-1 may be incident on the lens system LS-1 through the through hole H of the first reflection part R1-1. The first reflector R1-1, the second reflector R2-1 and the lens system LS-1 may be arranged in a line along the optical axis OA. The second reflective portion R2-1, the first reflective portion R1-1, and the lens system LS may be arranged in this order from the object side O to the image side I as shown in Fig.

The lens system LS-1 may include at least one lens. For example, the lens system LS-1 includes, for example, a first lens L11, a second lens L21, and a third lens L31 arranged in order from the object side O to the image side I ), And a fourth lens L41. In describing the configuration of each lens in the following description, the image side I may represent a direction in which an image plane IMG is formed, for example, The object side (O) may indicate the direction in which the object is located. The object side (O) can indicate the direction in which the subject is located based on the unfolded optical path. The "object side surface" of the lens refers to, for example, the lens surface on the side where the subject is on the basis of the optical axis OA and the " And the right side in the drawing can be shown as the lens surface on the side where the upper surface IMG is. The upper surface IMG may be, for example, an image pickup element surface or an image sensor surface. The image sensor may include, for example, a sensor such as a CMOS, a complementary metal oxide semiconductor, or a charge coupled device (CCD). The image sensor is not limited to this, and may be, for example, an element for converting an image of an object into an electrical image signal.

The first lens L11 may have a negative refractive power. The first lens L11 may include, for example, an object side surface S4 concave toward the object side. The first lens L11 may have a meniscus shape concave toward the object side O. [

The lenses disposed on the image side I of the first lens L11 may have a positive refractive power as a whole. For example, the second lens L21 may have a positive refractive power, the third lens L31 may have a positive refractive power, and the fourth lens L41 may have a positive refractive power. However, it is not limited thereto. For example, the second through fourth lenses L21, L31, and L41 may each have a meniscus shape. A diaphragm ST may be provided between the third lens L31 and the fourth lens L41. The stop ST is for adjusting the diameter of the light beam, and may include, for example, an aperture stop, a variable stop, or a stop in the form of a mask. According to various embodiments, at least one optical element OD may be provided between the fourth lens L41 and the upper surface IMG. The optical element OD may comprise at least one of a filter or a cover glass, for example. However, it is also possible to construct a lens system without an optical element.

The lens system LS-1 may be made of a material having an infrared wavelength characteristic. For example, the lens system LS-1 may be made of a material that transmits light having an infrared wavelength. The lens system LS-1 may be made of a material transmitting long-wavelength infrared light, for example, light having a wavelength in the range of 8-12 占 퐉. The lens system LS-1 may include at least one lens having a refractive index of 2.0 or more at a reference wavelength (wavelength in a range of 8-12 占 퐉). All the lenses included in the lens system LS-1 can have a refractive index of 2.0 or more at a reference wavelength (wavelength in a range of 8-12 占 퐉). The refractive index of a material having an infrared wavelength characteristic can have a relatively high refractive index as compared with a material having a characteristic of a visible light region. According to this characteristic, the refractive power of each lens can be appropriately arranged. For example, all the lenses included in the lens system LS-1 may be formed of Germanium.

According to various embodiments, the distance L _mirror between the first reflector R1-1 and the second reflector R2-1, the total length L _refraction of the lens system LS, -1), the size of the whole omnidirectional optical system can be reduced.

The object side surface of the first lens L11 on the most object side of the lens system LS-1 may be disposed above the through hole H of the first reflector R1-1.

The omnidirectional optical system according to various embodiments can satisfy the following expression. The following equations will be described with reference to the omnidirectional optical system 100-1 according to the first embodiment shown in Fig. However, the same can be applied to other embodiments.

<식 1>

<Formula 1>

Here, f _refraction is the focal length of the lens system located after the second reflector, and R _mirror represents the radius of curvature of the first reflector. In other words, f _refraction represents the combined focal length of the lens system disposed after the first reflector R1-1 and the second reflector R2-1.

The omnidirectional optical system according to various embodiments can be divided into a reflection unit for reflecting light and a lens system for forming light passing through the reflection unit on an image sensor. According to various embodiments, the first reflector R1-1 may reflect a ray of light incident in a range of 360 degrees to the second reflector R2-1. It is possible to receive omnidirectional light by the first reflector R1-1. The second reflecting part R2-1 can change the direction of the light beam to shorten the length of the omnidirectional optical system. The light reflected by the second reflecting portion R2-1 may then be refracted at each lens surface of the lens system LS-1 to be imaged on the image sensor.

가 식 1의 하한값보다 작은 값을 가질 때, 전방위 광학계가 커질 수 있고, 반대로

가 식 1의 상한값보다 큰 값을 가질 때, 주변부 광선이 이미지 센서에 정상적으로 결상되기 어렵게 될 수 있다. At this time, since the angle of view of the lens system is determined by the first reflecting unit, the focal length of the lens system can have an appropriate focal length according to the structure of the reflection unit.

Is smaller than the lower limit value of Equation (1), the omnidirectional optical system can be made larger, and conversely,

Is larger than the upper limit value of Equation (1), it is possible that the peripheral light rays are difficult to be normally imaged on the image sensor.

The distance between the reflective portion and the lens system, the size of the through-hole H in the reflective portion, the size of the lens system, and the like can be determined according to the relationship between the reflective portion and the lens system.

The omnidirectional optical system according to various embodiments can satisfy the following expression.

<식 2>

<Formula 2>

Here, L _refraction is the distance from the object side of the lens at the most object side of the lens system located after the second reflection unit to the image sensor, and L _mirror represents the distance between the first reflection unit and the second reflection unit.

The distance L _mirror between the first reflector R1-1 and the second reflector R2-1 is assumed to extend the spherical surface of the first reflector R1-1 to the through hole H Represents a distance between a point at which the optical axis OA and a point at which the second reflector R2-1 meets the optical axis OA. The L _refraction of the lens system LS-1 may indicate the distance from the object side of the first lens at the most object side of the lens system to the image plane IMG or the image sensor.

이 식 2를 만족할 때, 다양한 실시예에 따른 전방위 광학계를 소형화하면서 양호한 광학 성능을 확보할 수 있다.

When this expression (2) is satisfied, it is possible to miniaturize the omnidirectional optical system according to various embodiments and secure good optical performance.

The omnidirectional optical system according to various embodiments can satisfy the following expression.

<식 3>

<Formula 3>

Here, L _refraction is the distance from the object side of the lens at the most object side of the lens system located after the second reflection unit to the image sensor, and R _mirror represents the radius of curvature of the first reflection unit. The radius of curvature of the first reflecting portion R1-1 may indicate the radius of curvature when it is assumed that the spherical surface of the first reflecting portion R1-1 is extended to the through hole H. [

가 식 3을 만족할 때, 다양한 실시예에 따른 전방위 광학계를 소형화하면서 양호한 광학 성능을 가질 수 있다. According to Equation 3, the distance between the first reflecting portion and the second reflecting portion can be determined by the shape (or the radius of curvature) of the first reflecting portion having the optical refracting power,

Satisfies Equation 3, it is possible to miniaturize the omnidirectional optical system according to various embodiments and have good optical performance.

The omnidirectional optical system according to various embodiments can satisfy the following expression.

<식 4>

<Formula 4>

Here, D _refraction represents the largest aperture of the lens system located after the second reflector, and D _{mirror, obs} represents the diameter of the through hole of the first reflector.

가 식 4를 만족할 때, 다양한 실시예에 따른 전방위 광학계를 소형화할 수 있다.Equation 4 is a condition for the diameter of the through hole H of the first reflecting portion and the diameter of the lens system,

When Equation 4 is satisfied, the omnidirectional optical system according to various embodiments can be downsized.

Generally, reflective surfaces have high assembly and shape sensitivity. This problem may become even more serious in an optical system having an angle of view exceeding 90 degrees. Therefore, it is preferable to configure the first and second reflectors in a shape that is easy to process. In the omnidirectional optical system according to various embodiments, the first reflector may be formed as a spherical surface, and the second reflector may be formed as a plane. It is also preferable that the optical system used in the long wavelength infra red region does not have a cemented lens. In other words, the lenses included in the lens system of the omnidirectional optical system according to various embodiments may be spaced apart from each other.

The definition of the aspheric surface used in the omnidirectional optical system according to various embodiments is as follows.

The aspheric surface shape can be expressed by the following equation with the optical axis direction as x axis and the direction perpendicular to the optical axis direction as the y axis, assuming that the traveling direction of the ray is positive. Where x is the distance from the vertex of the lens to the optical axis direction, y is the distance in the direction perpendicular to the optical axis, K is the conic constant, A, B, C, D, ... C is an inverse number (1 / R) of the radius of curvature at the apex of the lens, respectively.

<식 5>

&Lt; EMI ID =

In the present invention, the omnidirectional optical system can be implemented through numerical embodiments according to various designs as follows.

In the table showing the data of each numerical example, the reflecting surface and the lens surface number (1, 2, 3... N) are sequentially aligned from the object side (O) to the image side (I). f is the total focal length of the omnidirectional optical system, Fno is the F number, HFOV is the half angle of view, R is the radius of curvature, Dn is the thickness of the lens or the air gap between the lens and the lens, Or the radius of the lens, and Vd represents the Abbe number. ST represents an aperture, and Object represents a subject.

&Lt; Embodiment 1 >

Fig. 1 shows an omnidirectional optical system of a first embodiment according to various embodiments. Table 1 shows, for example, the design data of the first embodiment.

f = 3.2, Fno = 1.4, HFOV = 30-110

if R Dn material H-Ape Note Object Infinity Infinity Air One 100 -40 Aluminum 65 through hole: 10 Reflect 2 Infinity 60 Aluminum 29.7 Reflect 3 Infinity -15 Air 6.4 4 -16.88 5 Germanium 7 The first lens
5 -22.62 3 Air 8.2 6 25.88 5 Germanium 7
The second lens 7 41.94 3 Air 5.8 8 -14.89 9.5 Germanium 4.4 Third lens
9 -22.26 3 Air 5.2 ST Infinity 3 Air 3.8 iris 11 14.6 3.5 Germanium 5.1 The fourth lens
12 18.02 1.5 Air 4.5 13 Infinity One Germanium 4.4 Cover Glass
14 Infinity 6.38 Air 4.4 IMG Infinity 0 Air 4.1

Fig. 2 shows a spot diagram of the omnidirectional optical system of the first embodiment. In the spot diagram, in order to examine the imaging characteristic of the omnidirectional optical system, the entrance pupil plane of the optical system is divided into small portions having the same area, and the light rays passing through the respective portions are perpendicular to the optical axis near the image plane The coordinate of the point intersecting the in plane is calculated and displayed as a picture. The circle of the spot diagram shows an airy disc, and the gathering of rays in the circle can show that it has a diffraction limited performance.

&Lt; Embodiment 2 >

Fig. 3 shows an omnidirectional optical system 100-2 according to the second embodiment according to various embodiments, and Table 2 shows, for example, the design data of the second embodiment.

The omnidirectional optical system 100-2 according to the second embodiment includes a first reflector R1-2 and a second reflector R2-2 that receives light reflected by the first reflector R1-2. And a lens system LS-2 that receives the light reflected by the second reflection unit R2-2. The first reflection part R1-2 may include a through hole H. The first reflecting portion R1-2 may be, for example, a spherical mirror. The light reflected by the second reflective portion R2-2 may be incident on the lens system LS-2 through the through hole H of the first reflective portion R1-2. The first reflector R1-2 and the second reflector R2-2 and the lens system LS-2 may be arranged in a line along the optical axis OA.

The lens system LS-2 may include at least one lens. For example, the lens system LS-2 includes, for example, a first lens L12, a second lens L22, and a third lens L22 arranged in this order from the object side O to the image side I L32). The first lens L12 may have an object side concave toward the object side O and an upper side convex to the image side I. The first lens L12 may have a negative refractive power. The second lens L22 may include a convex object side surface on the object side O and an image side surface concave on the image side I. The second lens L22 may have a negative refractive power. A diaphragm ST may be provided between the second lens L22 and the third lens L32. The third lens L32 may include a convex object side surface on the object side. The third lens L32 may include an upwardly concave upper surface. The third lens L32 may have a negative refractive power.

f = 2.92, F no = 1.4, HFOV = 30 DEG to 110 DEG

if R Dn material H-Ape Note Object Infinity Infinity Air One 100 -40 Aluminum 65 Hole: 13 Reflect 2 Infinity 60 Aluminum 32.4 Reflect 3 Infinity -6.7 Air 4.8 4 -16.44 30.13 Germanium 7.0 The first lens
5 -38.40 10 Air 11.0 6 47.25 5 Germanium 9.5 The second lens
7 122.75 2 Air 8.7 8 Infinity 3 Germanium 7.8 Third lens
9 37.18 10 Air 7.2 ST 28.30 2.57 Air 5.4 iris 11 Infinity One Germanium 5.1 Cover Glass 12 Infinity 6.69 Air 5.0 IMG Infinity 0 Air 4.0

The following is the aspheric surface coefficient of the omnidirectional optical system of the second embodiment.

if K A B C 4 1.10 -5.02E-05 -8.23E-08 -4.55E-09

Fig. 4 shows a spot diagram of the omnidirectional optical system of the second embodiment.

&Lt; Third Embodiment >

Fig. 5 shows an omnidirectional optical system 100-3 of a third embodiment according to various embodiments, and Table 4 shows, for example, design data of the third embodiment.

The omnidirectional optical system 100-3 according to the third embodiment includes a first reflector R1-3 and a second reflector R2-3 that receives light reflected by the first reflector R1-3. And a lens system LS-3 that receives the light reflected by the second reflection unit R2-3. The first reflecting portion R1-3 may include a through hole H. The first reflecting portion R1-3 may be, for example, a spherical mirror. The light reflected from the second reflection part R2-3 may be incident on the lens system LS-3 through the through hole H of the first reflection part R1-3. The first reflector R1-3, the second reflector R2-3 and the lens system LS-3 may be arranged in a line along the optical axis OA.

The lens system LS-3 may include at least one lens. For example, the lens system LS-3 includes, for example, a first lens L13, a second lens L23, and a third lens L33 arranged in order from the object side O to the image side I, And a fourth lens L43. The first lens L13 may have an object side surface concave toward the object side O and an upper surface convex to the image side I. The first lens L13 may have a negative refractive power. The second lens L23 may include an object side surface concave toward the object side O and an upper surface convex to the image side I. The second lens L23 may have a positive refractive power. The third lens L33 may include a convex object side to the object side O. [ The upper surface of the third lens L33 may be planar. The third lens L33 may have a positive refractive power. A diaphragm ST may be provided between the third lens L33 and the fourth lens L43. The fourth lens L43 may include a convex object side surface on the object side. The fourth lens L43 may include an upwardly concave upper surface. The fourth lens L43 may have a positive refractive power.

f = 3.24, F no = 1.4, HFOV: 30? 110?

if R Dn material H-Ape Note Object Infinity Infinity Air One 100 -40 Aluminum 65 through hole: 11 Reflect 2 Infinity 60 Aluminum 31.6 Reflect 3 Infinity -10 Air 6.1 4 -11.86 5 Germanium 6.1 The first lens
5 -20.55 15 Air 7.9 6 -37.39 5 Germanium 9.9 The second lens
7 -34.53 2 Air 11.0 8 162.28 5 Germanium 10.8 Third lens
9 Infinity One Air 10.5 ST Infinity 10.5 Air 10.2 iris 11 21.39 5 Germanium 11.3 The fourth lens
12 23.25 3.5 Air 9.7 13 Infinity One Germanium 9.2 Cover Glass 14 Infinity 13.6 Air 9.1 IMG Infinity 0 Air 4.1

Fig. 6 shows a spot diagram of the omnidirectional optical system of the third embodiment.

<Fourth Embodiment>

Fig. 7 shows an omnidirectional optical system 100-4 of the fourth embodiment according to various embodiments, and Table 5 shows, for example, the design data of the fourth embodiment.

The omnidirectional optical system 100-4 according to the fourth embodiment includes a first reflector R1-4 and a second reflector R2-4 that receives light reflected by the first reflector R1-4. And a lens system LS-4 that receives the light reflected by the second reflection unit R2-4. The first reflector R1-4 may have a through-hole H therein. The first reflector R1-4 may be, for example, a spherical mirror. The light reflected by the second reflection part R2-4 may be incident on the lens system LS-4 through the through hole H of the first reflection part R1-4. The first reflector R1-4, the second reflector R2-4 and the lens system LS-4 may be arranged in a line along the optical axis OA.

The lens system LS-4 may include at least one lens. For example, the lens system LS-4 includes, for example, a first lens L14, a second lens L24, and a third lens L34 arranged in order from the object side O to the image side I And a fourth lens L44. The first lens L14 may have an object side surface concave toward the object side O and an upper surface convex to the image side I. The second lens L24 may include an object side concave toward the object side O and an upper side convex to the image side I. The third lens L34 may include a convex object side surface on the object side (O). The upper surface of the third lens L34 may be planar. A diaphragm ST may be provided between the third lens L34 and the fourth lens L44. The fourth lens L44 may include a convex object side surface on the object side. The fourth lens L44 may include an upwardly concave upper surface.

f = 3.11, Fno = 1.4, HFOV = 30-110

if R Dn material H-Ape Note Object Infinity Infinity Air One 80 -40 Aluminum 65 through hole: 10 Reflect 2 Infinity 60 Aluminum 27.5 Reflect 3 Infinity -10 Air 5.8 4 -11.45 5 Germanium 6.2 The first lens
5 -18.80 15 Air 8.1 6 -29.27 5 Germanium 9.8 The second lens
7 -28.50 2 Air 11.1 8 199.97 5 Germanium 10.8 Third lens
9 Infinity One Air 10.5 ST Infinity 10.5 Air 10.2 iris 11 20.13 5 Germanium 11.3 The fourth lens
12 20.67 3.5 Air 9.5 13 Infinity One Germanium 9.0 Cover Glass 14 Infinity 14.4 Air 9.0 IMG Infinity 0 Air 4.1

Fig. 8 shows a spot diagram of the omnidirectional optical system of the fourth embodiment.

<Fifth Embodiment>

FIG. 9 shows an omnidirectional optical system 100-5 of a fifth embodiment according to various embodiments, and Table 6 shows, for example, the design data of the fifth embodiment.

The omnidirectional optical system 100-5 according to the fifth embodiment includes a first reflector R1-5 and a second reflector R2-5 that receives light reflected by the first reflector R1-5. And a lens system LS-5 for receiving the light reflected by the second reflection unit R2-5. The first reflector R1-5 may have a through-hole H therein. The first reflector R1-5 may be, for example, a spherical mirror. The light reflected by the second reflection part R2-5 may be incident on the lens system LS-5 through the through hole H of the first reflection part R1-5. The first reflector R1-5, the second reflector R2-5 and the lens system LS-5 may be arranged in a line along the optical axis OA.

The lens system LS-5 may include at least one lens. For example, the lens system LS-5 includes, for example, a first lens L15, a second lens L25, and a third lens L35 arranged in this order from the object side O to the image side I And a fourth lens L45. The first lens L15 may have an object side surface concave toward the object side O and an upper surface convex to the image side I. The second lens L25 may include an object side concave toward the object side O and an image side convex to the image side I. The third lens L35 may include an object side concave on the object side O. [ The third lens L35 may include a convex upper surface to the image side I. A diaphragm ST may be provided between the third lens L35 and the fourth lens L45. The fourth lens L45 may include a convex object side surface on the object side. The fourth lens L45 may include an upwardly concave upper surface.

f = 2.99, F no = 1.4, HFOV = 30 DEG to 110 DEG

if R Dn material H-Ape Note Object Infinity Infinity Air One 80 -40 Aluminum 65 Hole: 10 Reflect 2 Infinity 60 Aluminum 32.0 Reflect 3 Infinity -15 Air 5.8 4 -12.72 5 Germanium 7.4 The first lens
5 -16.36 3 Air 9.3 6 22.78 5 Germanium 7.0 The second lens
7 27.81 3 Air 5.5 8 -12.58 9.5 Germanium 4.1 Third lens
9 -19.94 3 Air 5.2 Stop Infinity 3 Air 3.8 iris 11 18.57 3.5 Germanium 5.0 The fourth lens
12 25.85 1.5 Air 4.5 13 Infinity One Germanium 4.4 Cover Glass 14 Infinity 7.7 Air 4.4 Image Infinity 0 Air 4.1

Fig. 10 shows a spot diagram of the omnidirectional optical system of the fifth embodiment.

Next, it is shown that the omnidirectional optical system according to various embodiments satisfies Equations (1) to (4).

Example 1 Example 2 Example 3 Example 4 Example 5 f _refraction 8.88 8.39 9.33 10.39 9.59 R _mirror 100.00 100.00 100.00 80.00 80.00 l _refraction 43.88 70.39 66.00 67.40 45.20 l _mirror 40.00 40.00 40.00 40.00 40.00 D _refraction 8.20 11.00 1.30 11.30 9.30 D _{mirror, obs} 10.00 13.00 11.00 10.00 10.00

수식 (1)

Equation (1) 0.09 0.08 0.09 0.13 0.12

Equation (2) 1.10 1.76 1.65 1.69 1.13 Equation (3) 0.44 0.70 0.66 0.84 0.57

Equation (4) 0.82 0.85 1.03 1.13 0.93

The omnidirectional optical system according to various embodiments can be applied, for example, to a photographing apparatus employing an image sensor. The omnidirectional optical system according to the exemplary embodiment is applicable to various photographing apparatuses such as digital cameras, interchangeable lens cameras, video cameras, surveillance cameras, and defense cameras.

11 shows an example of a photographing apparatus having an omnidirectional optical system according to an exemplary embodiment. The photographing apparatus may include an omnidirectional optical system 100 and an image sensor 110 that receives an image formed by the omnidirectional optical system 100 and converts the image into an electrical image signal. The omnidirectional optical system 100 may include a lens system LS including a first reflector R1, a second reflector R2, and at least one lens. The light L incident on the first reflecting portion R1 is incident on the lens system LS through the through hole H from the second reflecting portion R2. The light L can be imaged on the image sensor 11 through the lens system LS. As the omnidirectional optical system 100, the optical systems described with reference to Figs. 1 to 10 may be employed.

The image sensor 110 may include pixels that sensitize infrared rays. The infrared sensitive pixel can be made to be able to take an infrared ray in a situation where it is difficult to shoot visible light indoors or at night. The filter included in the image sensor protects the pixels from dust and other foreign objects. If the device used includes a pixel sensitive to visible light, it may also have the function of removing infrared rays to reduce the work noise due to heat by infrared rays.

When taking light of a visible light wavelength, infrared rays may be blocked by an infrared ray blocking film, or infrared rays may be removed through a processor when an infrared ray blocking film is not used. In the case of infrared ray imaging, an infrared ray image can be obtained by moving an infrared ray blocking film and using an infrared ray sensitive pixel.

It is possible to photograph or project an image having an angle of view of 360 degrees in all directions by using a photographing apparatus including an omnidirectional optical system according to various embodiments. As described above, the optical system of the present invention has been described as an optical system for obtaining an image of an omnidirectional angle of view around the central axis (or optical axis). However, the present invention is not limited to the photographing optical system and the observation optical system, And may be used as a projection optical system for projecting an image at an angle of view of 360 degrees in all directions.

It is also possible to apply the omnidirectional optical system according to various embodiments to the panoramic photographing apparatus. It is also possible to employ the omnidirectional optical system according to various embodiments as a photographing optical system at each corner or head of an automobile. It is also possible to provide a photographing apparatus using an omnidirectional optical system according to various embodiments on the outside of a building to be used as a surveillance camera. Furthermore, by taking an image at night through the movement of the infrared filter, it can be used as day and night.

The embodiments disclosed in this document are presented for the purpose of explanation and understanding of the disclosed technology and do not limit the scope of the technology described in this document. Accordingly, the scope of this document should be interpreted to include all modifications based on the technical idea of this document or various other embodiments. The above-described embodiments are merely illustrative, and various modifications and equivalent other embodiments are possible without departing from the scope of the present invention. Therefore, the scope of the true technical protection according to the embodiment of the present invention should be determined by the technical idea of the invention described in the following claims.

R1-1: first reflecting portion, R2-1: second reflecting portion
L11: first lens, L21: second lens
L31: third lens, L41: fourth lens
OD: optical element, ST: aperture

Claims (21)

A first reflector having a through-hole;
A second reflecting portion disposed to face the through hole and receiving light reflected by the first reflecting portion; And
And a lens system including at least one lens for receiving light reflected by the second reflecting unit and transmitting light to the image sensor,
An angle of view of 90 degrees or more,
An omnidirectional optical system satisfying the following expression.
<Expression>

Here, f _refraction is the focal length of the lens system located after the second reflector, and R _mirror represents the radius of curvature of the first reflector. The method according to claim 1,
Wherein the first reflecting part includes a spherical mirror. The method according to claim 1,
And the second reflecting portion includes a plane mirror. delete 4. The method according to any one of claims 1 to 3,
An omnidirectional optical system satisfying the following expression.
<Expression>

Here, L _refraction is the distance from the object side of the lens at the most object side of the lens system located after the second reflection unit to the image sensor, and L _mirror represents the distance between the first reflection unit and the second reflection unit. 4. The method according to any one of claims 1 to 3,
An omnidirectional optical system satisfying the following expression.
<Expression>

Here, L _refraction is the distance from the object side of the lens at the most object side of the lens system located after the second reflection unit to the image sensor, and R _mirror represents the radius of curvature of the first reflection unit. A first reflector having a through-hole;
A second reflecting portion disposed to face the through hole and receiving light reflected by the first reflecting portion; And
And a lens system including at least one lens for receiving light reflected by the second reflecting unit and transmitting light to the image sensor,
An angle of view of 90 degrees or more,
An omnidirectional optical system satisfying the following expression.
<Expression>

Here, D _refraction represents the largest aperture of the lens system located after the second reflector, and D _{mirror, obs} represents the diameter of the through hole of the first reflector. 4. The method according to any one of claims 1 to 3,
Wherein at least one of the lenses included in the lens system has a refractive index of 2.0 or more. 9. The method of claim 8,
Wherein all the lenses included in the lens system have a refractive index of 2.0 or more. 4. The method according to any one of claims 1 to 3,
Wherein the lens system comprises germanium. 4. The method according to any one of claims 1 to 3,
Wherein the lens system includes at least three lenses. 4. The method according to any one of claims 1 to 3,
Wherein the object side surface of the lens closest to the object side of the lens system has a concave shape. 4. The method according to any one of claims 1 to 3,
And the lens closest to the object side of the lens system has a negative refractive power. 4. The method according to any one of claims 1 to 3,
And an iris is provided on the object side of the lens on the most image side of the lens system. 4. The method according to any one of claims 1 to 3,
Wherein the lenses included in the lens system are not bonded together but are spaced apart from each other. Omnidirectional optical system; And
And an image sensor for receiving the light image formed by the omnidirectional optical system,
The omnidirectional optical system according to any one of claims 1 to 3, wherein the omnidirectional optical system includes a first reflecting portion having a through hole, a second reflecting portion disposed to face the through hole and receiving light reflected by the first reflecting portion, And at least one lens for transmitting light to the image sensor, wherein the lens system has an angle of view of 90 degrees or more,
The photographing apparatus satisfying the following expression.
<Expression>

Here, f _refraction is the focal length of the lens system located after the second reflector, and R _mirror represents the radius of curvature of the first reflector. 17. The method of claim 16,
Wherein the first reflecting part includes a spherical mirror. 17. The method of claim 16,
And the second reflecting portion includes a plane mirror. delete 19. The method according to any one of claims 16 to 18,
The photographing apparatus satisfying the following expression.
<Expression>

Here, L _refraction is the distance from the object side of the lens at the most object side of the lens system located after the second reflection unit to the image sensor, and L _mirror represents the distance between the first reflection unit and the second reflection unit. 19. The method according to any one of claims 16 to 18,
The photographing apparatus satisfying the following expression.
<Expression>

Here, L _refraction is the distance from the object side of the lens at the most object side of the lens system located after the second reflection unit to the image sensor, and R _mirror represents the radius of curvature of the first reflection unit.

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