WO2019189289A1 - Optical apparatus - Google Patents

Abstract

The purpose of the present invention is to provide an optical apparatus capable of effectively utilizing a space in a housing while enabling switching between a plurality of image-forming optical systems. An image-capturing apparatus 100 as an optical apparatus according to the present invention comprises a first and a second image-forming optical systems L1, L2 The image-capturing apparatus 100 enables switching between the first and second image-forming optical systems L1, L2. The image-capturing apparatus 100 switches between the first and second image-forming optical systems by moving the second image-forming optical system L1 between a first position where the second image-forming optical system is retracted from a space through which a light beam that is to be formed into an image by the first image-forming optical system L2 passes and a second position inserted into the first image-forming optical system.

Description

Optical device

The present invention relates to an optical device, and is suitable for a digital camera, a surveillance camera, an in-vehicle camera, and a camera mounted on a UAV (Unmanned Aerial Vehicle) such as a drone.

An imaging apparatus having a plurality of imaging optical systems and capable of switching the imaging optical system used for photographing is known.

Patent Document 1 describes an imaging apparatus that has two imaging optical systems and can change the imaging optical system used for photographing by moving one imaging element.

JP 2001-330878 A

However, since the imaging apparatus described in Patent Document 1 has a configuration in which a plurality of imaging optical systems are fixed and the imaging element is moved, the space in the housing for the imaging optical system that is not used is always wasted. It was.

Therefore, an object of the present invention is to realize an optical device that can effectively use a space in a housing while allowing a plurality of imaging optical systems to be switched.

The optical apparatus of the present invention includes first and second imaging optical systems, and is an optical apparatus that can be used by switching between the first and second imaging optical systems. In a state in which the optical system is used, the second imaging optical system is disposed at a position that does not block an optical path of the first imaging optical system, and in a state in which the second imaging optical system is used. The second imaging optical system is disposed at a position that blocks the optical path.

In addition, another optical device of the present invention is an optical device that includes first and second imaging optical systems and an imaging device, and can be used by switching between the first and second imaging optical systems. Thus, regardless of which of the first imaging optical system and the second imaging optical system is used, an image is acquired using the imaging device, and the switching is performed using the first and second imaging optical systems. The relative positional relationship of the second imaging optical system is determined so that the second imaging optical system is retracted from the space through which the light beam imaged by the first imaging optical system passes, It is performed by changing between the state in which the second imaging optical system is inserted, and the relative positional relationship between the first imaging optical system and the imaging element does not change before and after the switching. It is characterized by.

According to the present invention, it is possible to provide an optical device that can effectively use the space in the housing while allowing a plurality of imaging optical systems to be switched.

1 is a schematic diagram of an imaging apparatus according to Embodiment 1. FIG. 2 is a cross-sectional view of an imaging optical system in the imaging apparatus of Embodiment 1. FIG. FIG. 3 is a diagram illustrating distortion of the image forming optical system according to the first embodiment. 2 is a lateral aberration diagram of the imaging optical system according to Example 1. FIG. FIG. 6 is a schematic diagram of an imaging apparatus according to a second embodiment. FIG. 6 is a schematic diagram of an imaging apparatus according to a second embodiment. 6 is a cross-sectional view of an imaging optical system in an imaging apparatus according to Embodiment 2. FIG. FIG. 6 is a diagram illustrating distortion of the image forming optical system according to the second embodiment. 6 is a lateral aberration diagram of the image forming optical system according to Example 2. FIG. 6 is a cross-sectional view of an imaging optical system in an imaging apparatus according to Embodiment 3. FIG. FIG. 6 is a diagram illustrating distortion of the image forming optical system according to the third embodiment. 6 is a lateral aberration diagram of the image forming optical system according to Example 3. FIG. 6 is a cross-sectional view of an imaging optical system in an imaging apparatus of Embodiment 4. FIG. FIG. 10 is a diagram illustrating distortion of the image forming optical system according to the fourth embodiment. FIG. 6 is a lateral aberration diagram of the image forming optical system according to Example 4. 7 is a cross-sectional view of an imaging optical system in an imaging apparatus according to Embodiment 5. FIG. FIG. 10 is a diagram illustrating distortion of the image forming optical system according to the fifth embodiment. 6 is a lateral aberration diagram of the imaging optical system according to Example 5. FIG. It is a figure explaining the coordinate system used by this-application specification. It is a figure which shows the position on the image pick-up element which evaluated the aberration. It is a figure explaining the modification regarding the mechanism which moves a 2nd imaging optical system.

Prior to the description of the embodiments of the optical apparatus of the present invention, various definitions in the present specification will be described.

FIG. 19 is a diagram illustrating a coordinate system used when describing the imaging optical system of each embodiment. In the specification of the present application, one light beam that passes from the object side (subject side) toward the image side (image plane side formed on the image sensor) through the center of a pupil (aperture) (not shown) and reaches the center of the image plane. Is defined as the central chief ray or reference axis ray. The central principal ray (reference axis ray) is indicated by a one-dot chain line in FIG.

Also, the path followed by the central principal ray (reference axis ray) is defined as the reference axis.

In FIG. 19, the i-th optical surface (i-th surface) from the object side along the reference axis is the i-th surface Ri. In FIG. 19, the first surface R1 is the stop surface (incidence pupil part), the second surface R2 is the reflecting surface tilted with respect to the first surface R1, and the third surface R3 and the fourth surface R4 are the respective front surfaces. The reflecting surface is shifted and tilted with respect to the reflecting surface.

At least one of the first imaging optical system and the second imaging optical system in each embodiment to be described later is an off-axial optical system. Each surface constituting the Off-Axial optical system does not have a common optical axis. Therefore, an absolute coordinate system with the center of the first surface R1 as the origin is set. The position of the origin corresponds to the center position of the first surface R1 (the stop surface or the entrance pupil). Therefore, the reference axis passes through the origin of the absolute coordinate system.

The central principal ray (reference axis ray) passes through the center of the first surface R1 (the origin of the absolute coordinate system) and reaches the center of the final surface (image surface), and is refracted or reflected by each optical surface. The reference axis extends to the final surface while bending in turn on each optical surface. In the following description, the image plane side and the object side mean which side is along the reference axis.

In the absolute coordinate system, a straight line passing through the origin and parallel to the reference axis extending from the first surface is called the Z-axis (the direction from the first surface toward the second surface is positive). Further, the axis in the paper of FIG. 19 that passes through the origin and forms 90 ° counterclockwise with respect to the Z-axis in accordance with the definition of the right-handed coordinate system is called the Y-axis. A straight line that passes through the origin and is perpendicular to the Z-axis and the Y-axis is referred to as an X-axis (the direction toward the back of the page in FIG. 19 is positive).

In addition, a local coordinate system is defined to represent the surface shape and tilt angle of the optical surface after the first surface R1 in the imaging optical system. A local coordinate system is defined for each optical surface after the first surface R1. The surface shape of the optical surface in the imaging optical system of each embodiment will be described using local coordinates.

The origin of the local coordinate system is the point where the reference axis and the i-th surface Ri intersect.

The z axis in the local coordinate system of the i-th surface Ri is a surface normal at a point on the reference axis of the i-th surface. The y axis in the local coordinate system passes through the origin of the local coordinate and is an axis in the plane of FIG. 19 that forms 90 ° counterclockwise with respect to the z direction according to the definition of the right hand coordinate system. The x-axis of the local coordinate system is a straight line that passes through the origin of the local coordinates and is perpendicular to the z-axis and the y-axis.

The tilt angle θxi (°) in the yz plane of the i-th surface is an acute angle formed in the yz-plane with respect to the reference axis extending from the i-1th plane in the local coordinate system (counterclockwise direction Positive). The tilt angle θyi (°) in the xz plane of the i-th surface is an acute angle formed in the xz plane with respect to the reference axis extending from the i−1 plane (the counterclockwise direction is positive). The direction of the arrow of each axis in FIG. 19 represents the positive direction of each axis.

Next, each example relating to the optical device of the present invention will be described.

[Example 1]
FIGS. 1A to 1D are schematic views showing a configuration of an imaging apparatus 100 as an optical apparatus in the present embodiment. 2A to 2C are cross-sectional views of the imaging optical system included in the imaging apparatus 100. FIG.

The imaging apparatus 100 of the present embodiment includes a first imaging optical system L1, a second imaging optical system L2, and a member that holds each imaging optical system. The member that holds the second imaging optical system L2 is configured to be movable with respect to the member that holds the first imaging optical system L1, and the imaging apparatus 100 can switch the imaging optical system to be used. it can.

In the imaging apparatus 100 of the present embodiment, when the first imaging optical system L1 is used, the light beam imaged by the first imaging optical system L1 passes through the second imaging optical system L2. It arrange | positions in the 1st position which is a position evacuated from space. On the other hand, when the optical system to be used is switched to the second imaging optical system L2, a light beam imaged by the first imaging optical system L1 passes when the first imaging optical system L1 is used. The second imaging optical system L2 is inserted at a second position in the space.

That is, when the first imaging optical system L1 is used, the first imaging optical system L2 is arranged at a position that does not block the optical path of the first imaging optical system L1. The optical path of the imaging optical system L1 is made effective. At this time, light from the object enters the first imaging optical system L1 and is imaged by the first imaging optical system L1. on the other hand. When the second imaging optical system L2 is used, the second imaging optical system L2 is disposed at a position that blocks the optical path of the first imaging optical system L1, and the first imaging optical system is used. The optical path of the second imaging optical system L2 is validated while invalidating the optical path of L1. At this time, light from the object enters the second imaging optical system L2, and is imaged by the second imaging optical system L2.

Thus, in this embodiment, the imaging optical system to be used is switched by changing the relative positional relationship between the first imaging optical system L1 and the second imaging optical system L2. Thus, when the second imaging optical system L2 is used, the second imaging optical system L2 is imaged inside the first imaging optical system L1 (by the first imaging optical system L1). Therefore, the space in the housing can be used effectively.

FIG. 1A is a view of the imaging device 100 in a state in which the second imaging optical system L2 is used as seen from a direction parallel to the Z axis. FIG. 1B is a diagram of the imaging device 100 in a state where the first imaging optical system L1 is used as seen from a direction parallel to the Z axis. 1C is a perspective view of the imaging device 100 corresponding to FIG. 1A, and FIG. 1D is a perspective view of the imaging device 100 corresponding to FIG.

Here, SP1 is an opening through which light imaged by the first imaging optical system L1 enters, and SP2 is an opening through which light imaged by the second imaging optical system L2 enters. . SP1 and SP2 also function as a diaphragm of each imaging optical system. IMG is an image plane. The image plane IMG corresponds to the final plane in each imaging optical system. This is different from an intermediate imaging plane described later, which is in the middle of the optical path of the imaging optical system. In this embodiment, a light receiving surface of an image sensor such as a CCD or a CMOS sensor is arranged on the image plane IMG. The image sensor is shared regardless of the imaging optical system used.

In addition, although the present embodiment shows a case where the imaging apparatus 100 as an optical apparatus has an imaging element, the imaging element may be separate from the optical apparatus.

As shown in FIGS. 1A and 1C, when the second imaging optical system L2 is used, the imaging optical system L2 is housed inside the first imaging optical system L1. Thus, the second imaging optical system L2 is arranged. At this time, since the optical path of the first imaging optical system L1 is blocked by the second imaging optical system L2, the first imaging optical system L1 is invalid (the first imaging optical system L1). Light does not enter the system L1). For this reason, an image by the second imaging optical system L2 is formed on the image plane IMG.

Further, as shown in FIGS. 1B and 1D, when the first imaging optical system L1 is used, the second imaging optical system from the inside of the first imaging optical system L1 is used. By retracting L2, the optical path of the first imaging optical system L1 is validated. The arrows shown in FIGS. 1B and 1D indicate the moving direction when the second imaging optical system L2 is retracted by a slide mechanism (not shown). At this time, since the optical path of the first imaging optical system L1 is validated (light is incident on the first imaging optical system L1), the first connection is made on the image plane IMG. An image is formed by the image optical system L1.

Note that the mechanism for moving the second imaging optical system L2 is not particularly limited. The movement of the second imaging optical system L2 may be performed manually or electrically by a driving means such as a motor. An elastic member such as a spring or rubber may be provided so that only one of insertion and removal from the inside of the first imaging optical system L1 is performed by the elastic force of the elastic member.

Further, FIGS. 1A to 1D illustrate a mechanism for inserting / removing the second imaging optical system L2 by translating the second imaging optical system L2, but the present invention is not limited to this. It is not limited to. FIGS. 21A to 21D are diagrams showing modifications of the moving mechanism of the second imaging optical system L2. As shown in FIGS. 21A to 21D, the first imaging optical system L1 and the second imaging optical system L2 are connected by the axis P, and the second imaging optical system L2 is centered on the axis P. You may insert / extract with respect to the 1st imaging optical system L1 by rotating.

Further, when the first imaging optical system L1 is used, it is not always necessary to retract the second imaging optical system L2 integrally from the first imaging optical system L1. When the first imaging optical system L1 is used, the optical path of the first imaging optical system L1 is not blocked, and when the second imaging optical system L2 is used, the first imaging optical system L1 It is sufficient if the light path is blocked. For this reason, the optical surface of the second imaging optical system L2 is constituted by a reflecting surface, and when using the first imaging optical system L1, each optical surface of the second imaging optical system L2 is You may make it tilt or shift so that the optical path of the 1st imaging optical system L1 may not be interrupted.

Next, the first imaging optical system L1 and the second imaging optical system L2 in the imaging apparatus 100 of the present embodiment will be described.

FIG. 2A is a sectional view of the first imaging optical system L1 in the present embodiment. FIG. 2B is a sectional view of the second imaging optical system L2 in the present embodiment. FIG. 2C shows a state in which the second imaging optical system L2 is inserted in the first imaging optical system L1 in the imaging apparatus 100 of the present embodiment (FIGS. 1A and 1C are shown). It is sectional drawing of the state shown.

In this embodiment, the first imaging optical system L1 and the second imaging optical system L2 are both off-axial optical systems having five free-form reflecting surfaces. In this embodiment, the space between the optical surfaces in each imaging optical system is filled with air. Each reflecting surface is a mirror made of metal, glass, plastic or the like. The reflective surface can be formed by vapor-depositing a material having high reflectivity in a visible light region or an infrared light region such as silver or aluminum on a substrate.

The region through which the light beam imaged by the first imaging optical system L1 passes is larger than the region through which the light beam imaged by the second imaging optical system L2 passes. For this reason, there is a space in which the second imaging optical system L2 can be accommodated inside the first imaging optical system L1.

As shown in FIG. 2A, the light incident on the first surface R10 of the first imaging optical system L1 is reflected in order while converging or diverging from the second surface R11 to the sixth surface R15, and the image surface. Imaging with IMG. The first surface R10 corresponds to the opening (aperture stop) SP1 in FIGS. The first surface R10 corresponds to the entrance pupil of the first imaging optical system L1. The aperture diameter of the aperture (aperture stop) SP1 may be variable. Further, M1 shown in FIG. 2A indicates an intermediate imaging plane in the first imaging optical system L1.

As shown in FIG. 2B, the light incident on the first surface R20 of the second imaging optical system L2 is reflected in order while converging or diverging from the second surface R21 to the sixth surface R25, and the image surface. Imaging with IMG. The first surface R20 corresponds to the aperture (aperture stop) SP2 in FIGS. 1 (a) to 1 (d). The first surface R20 corresponds to the entrance pupil of the second imaging optical system L2. The aperture diameter of the aperture (aperture stop) SP2 may be variable as in the aperture SP1. Further, M2 shown in FIG. 2B indicates an intermediate imaging plane in the second imaging optical system L2.

More detailed shapes and the like of the first image forming optical system L1 and the second image forming optical system L2 will be described in Numerical Example 1 later.

FIG. 2C is a cross-sectional view when the second imaging optical system L2 is inserted into the first imaging optical system L1. At this time, in this embodiment, the XY coordinates of the centers of the first surfaces R10 (opening portion SP1) and R20 (opening portion SP2) of the first imaging optical system L1 and the second imaging optical system L2 coincide with each other. Placed in. In the present embodiment, the first image forming optical system L1 and the second image forming optical system L2 are arranged so that their image planes coincide with the image plane IMG.

In the arrangement shown in FIG. 2 (c), the optical path of the first imaging optical system L1 is blocked by the second imaging optical system L2. For this reason, the light incident on the first surface R10 (opening SP1) of the first imaging optical system L1 does not reach the sixth surface R15 from the second surface R11 of the first imaging optical system L1. Part of the light incident on the first surface R10 (opening SP1) of the first imaging optical system L1 enters the first surface R20 (opening SP2) of the second imaging optical system L2, and then The light is reflected from the second surface R21 to the sixth surface R25 and reaches the image surface IMG. That is, an image by the second imaging optical system L2 is formed on the image plane IMG.

As described above, in the state in which the second imaging optical system L2 is retracted from the space inside the first imaging optical system L1 (FIG. 2A), the first imaging optical on the image plane IMG. An image is formed by the system L1. That is, in this case, the first imaging optical system is used. On the other hand, in a state where the second imaging optical system L2 is inserted into the space inside the first imaging optical system L1 (FIG. 2C), the second imaging optical system L2 is present on the image plane IMG. An image is formed. That is, the second imaging optical system L2 is used.

Next, the optical characteristics of the first imaging optical system L1 and the second imaging optical system L2 in this embodiment will be described.

3 (a) and 3 (b) show distortion of the imaging optical system of the present embodiment. 3A shows distortion in the first imaging optical system L1, and FIG. 3B shows distortion in the second imaging optical system L2. 3A and 3B, the horizontal axis is the coordinate value on the image plane IMG in the X-axis direction (corresponding to the X angle of view (X FOV)), and the vertical axis is on the image plane in the Y-axis direction. Coordinate values (equivalent to Y angle of view (Y FOV)). In addition, an ideal lattice without distortion (Paraxial FOV) and an actual ray tracing result lattice (Actual FOV) are drawn in an overlapping manner. In an optical system with a large distortion, the difference between the Actual FOV and the Paraxial FOV is large, but the distortions of the first imaging optical system L1 and the second imaging optical system L2 in this embodiment are shown in FIGS. ) Is extremely small as shown in

FIGS. 4A and 4B are lateral aberration diagrams of the imaging optical system of the present example. 4A is a lateral aberration diagram of the first imaging optical system L1, and FIG. 4B is a lateral aberration diagram of the second imaging optical system L2. The lateral aberration diagrams shown in FIGS. 4A and 4B are shown with respect to positions 1 to 5 on the image sensor shown in FIG. In each lateral aberration diagram shown in FIGS. 4A and 4B, the horizontal axis represents the X axis or Y axis on the pupil plane, and the vertical axis represents the amount of aberration on the image plane. The wavelength of the evaluation light beam is d-line. ω is a half angle of view. In the aberration diagram, in the imaging optical system shown in Numerical Example 1 to be described later, a lateral aberration is shown on a scale of ± 0.0025 mm. In the YZ section, the focal length of the first imaging optical system L1 is 71.65 mm, and the F number is 8.0. In the YZ section, the focal length of the second imaging optical system L2 is 17.91 mm, and the F number is 8.0.

Next, a preferable configuration of the imaging apparatus 100 according to the present embodiment will be described.

It is preferable that the field angle of the first imaging optical system L1 and the field angle of the second imaging optical system L2 are different from each other. As a result, it is possible to switch the angle of view taken by switching the imaging optical system described above.

As a lens that can switch the angle of view, a zoom lens that moves the lens included in the optical system in the optical axis direction is known, but a complicated mechanism is required because it is necessary to move multiple lenses along different trajectories Met. In addition, since it is necessary to move the lens along the movement trajectory, the angle of view cannot be switched instantaneously.

In addition, in a lens device incorporating an extender that can be inserted into and removed from the optical path, the angle of view can be switched instantaneously, but the imaging performance after insertion of the extender depends on the imaging performance of the master lens. It has been difficult to change the angle of view while maintaining image performance.

On the other hand, by changing the angle of view of the first imaging optical system L1 and the second imaging optical system L2 in the imaging apparatus 100 of the present embodiment, the angle of view can be instantaneously switched with a simple mechanism. Become. In addition, since the imaging apparatus 100 according to the present embodiment changes the angle of view by switching the imaging optical system itself, each imaging optical system can be individually designed to switch the angle of view while obtaining high imaging performance. Is possible.

The second imaging optical system L2 is preferably configured to have a wider angle of view than the first imaging optical system L1. In general, the optical path length of the imaging optical system becomes longer as the angle of view becomes narrower. Therefore, even if a reflection surface is provided in the imaging optical system and the optical path is bent, the imaging optical system is likely to be enlarged as the angle of view becomes narrower. For this reason, the design of the first imaging optical system L1 can be facilitated by setting the second imaging optical system L2 that can be inserted into the first imaging optical system L1 to have a wider angle. It becomes.

The first imaging optical system L1 is preferably configured to include a plurality of reflecting surfaces, and the space between the reflecting surfaces is preferably filled with gas (air). Such a configuration is called a hollow mirror configuration.

Since the hollow mirror configuration hardly causes chromatic aberration, the second imaging optical system L2 can be inserted into the first imaging optical system L1 while improving the imaging performance of the first imaging optical system L1. Space can be secured.

More preferably, the first image-forming optical system L1 may be composed only of a reflecting surface. In addition, if it does not have a refracting surface having optical power, it is assumed that it is composed only of a reflecting surface even if a diaphragm surface or a cover glass that does not contribute to light image formation is provided. This makes it easy to secure a sufficient space for housing the second imaging optical system. In addition, since the first imaging optical system L1 can be configured to be lightweight, the imaging device 100 can be reduced in weight.

Further, it is preferable that the first imaging optical system L1 includes at least one free-form reflecting surface. Similarly, it is preferable that the second imaging optical system L2 includes at least one free-form reflecting surface. This makes it possible to easily correct aberrations caused by the eccentric arrangement of the reflecting surfaces in each imaging optical system.

Further, it is preferable that the entrance pupil position of the first imaging optical system L1 is closer to the object side than the reflecting surface closest to the object side. In the first imaging optical system L1 of the present embodiment, the opening SP1 that functions as an aperture stop corresponds to the entrance pupil. This can prevent an excessive increase in the size of each reflecting surface in the first imaging optical system L1. In addition, since the incident light and the reflected light on each reflecting surface can pass through the same space, downsizing is facilitated. Note that the entrance pupil position does not necessarily coincide with the opening SP1.

In addition, it is preferable to use a common image sensor regardless of which of the first and second imaging optical systems is used. Therefore, the position of the image plane of the first imaging optical system L1 in the state where the first imaging optical system L1 is used and the second imaging optical in the state where the second imaging optical system L2 is used. The image planes of the system L2 are preferably coincident. By sharing the imaging element, the imaging apparatus 100 can be configured more compactly.

Furthermore, the image sensor may be movable. For example, focusing may be performed by moving the image sensor in the direction of the reference axis and moving the image sensor. In this case, the focus mechanism can be shared by the first imaging optical system L1 and the second imaging optical system L2. Further, when the positions of the image planes of the first imaging optical system L1 and the second imaging optical system L2 are different in the reference axis direction, the image pickup device is moved in accordance with the switching of the imaging optical system. Anyway.

Furthermore, the image sensor may be movable in the xz plane, and camera shake correction (image blur correction) may be performed by moving the image sensor. In this case, the image stabilization mechanism can be shared by the first imaging optical system L1 and the second imaging optical system L2.

In addition, at least one of the first imaging optical system L1 and the second imaging optical system L2 has at least one intermediate imaging plane that forms a real image in the optical path at a position different from the image plane IMG. It is preferable to have one.

By providing an intermediate imaging plane in the imaging optical system, it is possible to suppress excessive spread of the light beam in the optical system. As a result, the shape and angle of view of the imaging optical system can be easily controlled, and an imaging optical system having desired characteristics can be configured without being excessively large.

Further, it is preferable that the open F numbers for the axial light beams of the first imaging optical system L1 and the second imaging optical system L2 are the same. Thereby, when the imaging optical system is switched between the first imaging optical system L1 and the second imaging optical system L2, the brightness of the acquired image can be made constant. If the difference between the open F numbers of the first image forming optical system L1 and the second image forming optical system L2 is less than ½, the open F numbers can be regarded as the same. The “axial light beam” is a light beam that forms an image at the center of the image plane. That is, the axial light beam includes the reference axis light beam.

Further, an optical element such as a cover glass or a lens having a transmittance characteristic that transmits light having a wavelength necessary for imaging may be added to positions near the openings SP1 and SP2 and the image plane IMG. By doing so, it is possible to prevent dust and dust from adhering in the first image forming optical system L1 and the second image forming optical system L2 and the image pickup device.

Furthermore, it may be configured such that a common optical system can be added to the first imaging optical system L1 and the second imaging optical system L2. For example, a close-up lens that enables close-up photography can be attached to the object side of the opening SP1, or an extender for changing the magnification can be inserted and removed near the image plane IMG.

[Example 2]
Next, Example 2 will be described. The image pickup apparatus according to the present embodiment is different from the first embodiment in that a third image forming optical system is further provided in addition to the first image forming optical system L1 and the second image forming optical system L2. Since the first imaging optical system L1 and the second imaging optical system L2 in the present embodiment are the same as those in the first embodiment, description thereof is omitted.

5 (a) to 5 (c) and FIGS. 6 (a) to 6 (c) are schematic views showing the imaging apparatus 100 of the present embodiment.

FIG. 5A is a diagram of the imaging device 100 in a state where the second imaging optical system L2 is used as seen from a direction parallel to the Z axis. FIG. 5B is a diagram of the imaging apparatus 100 in a state in which the first imaging optical system L1 is used as seen from a direction parallel to the Z axis. FIG. 5C is a diagram of the imaging device 100 in a state where the third imaging optical system L3 is used as seen from a direction parallel to the Z axis.

6A is a perspective view of the imaging apparatus 100 corresponding to FIG. 5A, FIG. 6B is a perspective view of the imaging apparatus 100 corresponding to FIG. 5B, and FIG. ) Is a perspective view of the imaging apparatus 100 corresponding to FIG.

As shown in FIGS. 5A to 5C and FIGS. 6A to 6C, the third imaging optical system L3 in this embodiment is configured to be larger than the first imaging optical system L1. Thus, the first imaging optical system can be inserted into the third imaging optical system L3.

When the third imaging optical system L3 is used, as shown in FIGS. 5C and 6C, the first imaging optical system from the inside of the third imaging optical system L3 is used. L1 and the second imaging optical system L2 are retracted, and the optical path of the third imaging optical system L3 is validated. That is, light incident from the aperture SP3 of the third imaging optical system L3 (which also functions as an aperture stop of the third imaging optical system L3) is transmitted through each optical surface of the third imaging optical system L3. An image is formed on the image plane IMG while being converged or diverged.

As described above, according to the present invention, even if there are three or more imaging optical systems to be switched, it is possible to effectively use the space in the housing while enabling switching of the imaging optical system to be used.

5C and 6C show a state in which the second imaging optical system L2 is retracted from the optical path of the first imaging optical system L1, the third result is shown. When the image optical system L3 is used, the second imaging optical system L2 may be inserted into the first imaging optical system L1. As a result, the space for disposing the imaging optical system in the imaging apparatus 100 can be further reduced, and further miniaturization can be achieved.

Next, the third imaging optical system L3 in this embodiment will be described. FIG. 7A is a cross-sectional view of the third imaging optical system L3 in the present embodiment. FIG. 7B shows a state in which the first imaging optical system L1 and the second imaging optical system L2 are inserted into the third imaging optical system L3 in this embodiment (FIGS. 5A and 6). It is sectional drawing of the state shown to (a). FIG. 7C is a cross section of a state in which the first imaging optical system L1 is inserted into the third imaging optical system L3 in this embodiment (the state shown in FIGS. 5B and 6B). FIG.

In the present embodiment, the third imaging optical system L3 is an Off-Axial optical system having five reflecting surfaces. Also in this embodiment, the space between the optical surfaces in each imaging optical system is filled with air.

The region through which the light beam imaged by the third imaging optical system L3 passes is larger than the region through which the light beam imaged by the first imaging optical system L1 passes. For this reason, a space in which the first imaging optical system L1 can be accommodated is provided inside the third imaging optical system L3.

As shown in FIG. 7A, the light incident on the first surface R30 of the third imaging optical system L3 is reflected in order while converging or diverging from the second surface R31 to the sixth surface R35, and the image surface. Imaging with IMG. The first surface R30 corresponds to the opening (aperture stop) SP3 in FIGS. 5 (a) to 5 (c). The first surface R30 corresponds to the entrance pupil of the third imaging optical system L3. The aperture diameter of the aperture (aperture stop) SP3 may be variable. Further, M3 shown in FIG. 7A indicates an intermediate imaging plane in the third imaging optical system L3.

A more detailed shape of the third imaging optical system L3 will be described later in Numerical Example 2.

As shown in FIGS. 7B and 7C, when the first imaging optical system L1 and the second imaging optical system L2 are inserted into the third imaging optical system L3, the aperture The light incident from the part SP3 does not reach the sixth surface R35 from the second surface R31 of the third imaging optical system L3. At this time, the light incident from the opening SP3 is imaged on the image plane IMG by the imaging optical system arranged on the innermost side. That is, the imaging optical system to be used can be switched by inserting and removing the imaging optical system.

Next, the optical characteristics of the third imaging optical system L3 in this embodiment will be described.

FIG. 8 shows distortion of the third imaging optical system L3 of the present embodiment. The distortion of the third imaging optical system L3 is extremely small as shown in FIG.

FIG. 9 shows a lateral aberration diagram of the third imaging optical system L3 of the present example. The lateral aberration diagram shown in FIG. 9 is shown with respect to positions 1 to 5 on the image sensor shown in FIG.

In the YZ section, the focal length of the third imaging optical system L3 is 214.95 mm, and the F number is 11.0.

It should be noted that an optical element such as a cover glass or a lens having a transmittance characteristic that transmits a wavelength necessary for imaging may be added at a position near the opening SP3. Thereby, it is possible to prevent dust and dirt from adhering to the inside of the third imaging optical system L3 and the image sensor.

[Example 3]
Next, Example 3 will be described. The imaging apparatus of the present embodiment has two imaging optical systems as in the first embodiment. The appearance of the image pickup apparatus of the present embodiment is the same as that shown in FIGS. 1 (a) to 1 (d). However, the optical characteristics of the two imaging optical systems in this embodiment are different from those in the first embodiment. In the present embodiment, the second imaging optical system that is inserted into and extracted from the first imaging optical system is not a hollow mirror structure, but is composed of a solid prism having a plurality of reflecting surfaces. By configuring the second imaging optical system with a prism as in this embodiment, the optical path length can be increased, and the second imaging optical system can be further miniaturized. As a result, there is a merit that it is easy to insert and remove from the first imaging optical system.

In the present embodiment, the first imaging optical system L1 is an off-axial optical system having four free-form reflecting surfaces. In this embodiment, the space between the optical surfaces in the first imaging optical system is filled with air. In the present embodiment, the second imaging optical system L2 is an off-axial optical system having four free-form curved reflecting surfaces and two free-form refracting surfaces.

FIG. 10A is a sectional view of the first imaging optical system L1 in the present embodiment. FIG. 10B is a cross-sectional view of the second imaging optical system L2 in the present embodiment. FIG. 10C is a cross-sectional view showing a state in which the second imaging optical system L2 is inserted into the first imaging optical system L1 in the present embodiment.

As shown in FIG. 10A, the light incident on the first surface R40 of the first imaging optical system L1 is reflected in order while converging or diverging from the second surface R41 to the fifth surface R44, and the image surface. Imaging with IMG. The first surface R40 is an entrance pupil of the first imaging optical system L1, and corresponds to the aperture (aperture stop) SP1 in FIGS. 1 (a) to 1 (d).

As shown in FIG. 10B, in the second imaging optical system L2, the light incident on the first surface R50 that is a refractive surface is sequentially converged or diverged from the second surface R51 to the fifth surface R54. Reflected. Then, the light passes through the sixth surface R55, which is a refractive surface, and forms an image on the image surface IMG. The first surface R50 is an entrance pupil of the second imaging optical system L2, and corresponds to the aperture (aperture stop) SP2 in FIGS. 1 (a) to 1 (d). An aperture stop having a variable aperture diameter may be provided on the object side of the first surface R50. Further, M5 shown in FIG. 10B indicates an intermediate imaging plane in the second imaging optical system L2.

More detailed shapes and the like of the first imaging optical system L1 and the second imaging optical system L2 in this embodiment will be described in Numerical Example 3 later.

FIG. 10C is a cross-sectional view when the second imaging optical system L2 of the present embodiment is inserted into the first imaging optical system L1. Also in the present embodiment, the first imaging optical system L1 and the second imaging optical system L2 have the same XY coordinates of the center of the first surface R40 (opening SP1) and the center of R50 (opening SP2). To be arranged. Further, the first imaging optical system L1 and the second imaging optical system L2 are arranged so that their image planes coincide with the image plane IMG.

Next, the optical characteristics of the first imaging optical system L1 and the second imaging optical system L2 in this embodiment will be described.

FIGS. 11A and 11B show distortion of the imaging optical system of the present embodiment. FIG. 11A shows distortion in the first imaging optical system L1, and FIG. 11B shows distortion in the second imaging optical system L2. The distortion of the first imaging optical system L1 and the second imaging optical system L2 in this embodiment is extremely small as shown in FIGS. 11 (a) and 11 (b).

FIGS. 12A and 12B show lateral aberration diagrams of the imaging optical system of the present example. FIG. 12A is a lateral aberration diagram of the first imaging optical system L1, and FIG. 12B is a lateral aberration diagram of the second imaging optical system L2. The lateral aberration diagram shown in FIG. 12A is shown for positions 1 to 5 on the image sensor shown in FIG. Further, the lateral aberration diagram shown in FIG. 12B is shown with respect to positions 1 to 5 on the image sensor shown in FIG.

In the YZ cross section, the focal length of the first imaging optical system L1 of the present example is 71.65 mm, and the F number is 8.0. In the YZ section, the focal length of the second imaging optical system L2 is 17.91 mm, and the F number is 8.0.

[Example 4]
Next, Example 4 will be described. The imaging apparatus of the present embodiment has two imaging optical systems as in the first and third embodiments. The appearance of the image pickup apparatus according to the present embodiment is the same as that shown in FIGS. 1A to 1D except for the size relationship between the diameters of the openings. The optical characteristics of the two imaging optical systems in this embodiment are different from those in the first and third embodiments. Specifically, the field angle of the first imaging optical system in the present embodiment is larger than the field angle of the second imaging optical system. Further, the opening for capturing light into the first imaging optical system (also functions as an aperture stop) is more than the opening for capturing light into the second imaging optical system (also functions as an aperture stop). Is also small.

In this embodiment, the first imaging optical system L1 is an off-axial optical system having five free-form reflecting surfaces. In this embodiment, the second imaging optical system L2 is an Off-Axial optical system having five free-form reflecting surfaces.

FIG. 13A is a sectional view of the first imaging optical system L1 in the present embodiment. FIG. 13B is a cross-sectional view of the second imaging optical system L2 in the present embodiment. FIG. 13C is a cross-sectional view showing a state in which the second imaging optical system L2 is inserted into the first imaging optical system L1 in the present embodiment.

As shown in FIG. 13A, the light incident on the first surface R60 of the first imaging optical system L1 is reflected in order while converging or diverging from the second surface R61 to the sixth surface R65, and the image surface. Imaging with IMG. The first surface R60 is the entrance pupil of the first imaging optical system L1, and corresponds to the aperture (aperture stop) SP1 in FIGS. 1 (a) to 1 (d). Further, M6 shown in FIG. 13A indicates an intermediate imaging plane in the first imaging optical system L1.

As shown in FIG. 13B, in the second imaging optical system L2, the light incident on the first surface R70 is reflected in order while converging or diverging from the second surface R71 to the sixth surface R75, and the image An image is formed on the surface IMG. The first surface R70 is an entrance pupil of the second imaging optical system L2, and corresponds to the aperture (aperture stop) SP2 in FIGS. 1 (a) to 1 (d). Further, M7 shown in FIG. 13B indicates an intermediate imaging plane in the second imaging optical system L2.

More detailed shapes and the like of the first image forming optical system L1 and the second image forming optical system L2 in this embodiment will be described in Numerical Example 4 later.

FIG. 13C is a cross-sectional view when the second imaging optical system L2 of the present embodiment is inserted into the first imaging optical system L1. Also in the present embodiment, the first imaging optical system L1 and the second imaging optical system L2 have the same XY coordinates of the center of the first surface R60 (opening SP1) and the center of R70 (opening SP2). To be arranged. Further, the first imaging optical system L1 and the second imaging optical system L2 are arranged so that their image planes coincide with the image plane IMG.

In this embodiment, as described above, the diameter of the first surface R60 (opening SP1) of the first imaging optical system L1 is the same as that of the first surface R70 (opening SP2) of the second imaging optical system L2. Smaller than the diameter. Therefore, the diameter of the opening SP1 in the first imaging optical system L1 is configured to be variable, and the second imaging optical system L2 is the first imaging optical system L1 as shown in FIG. 13C. It is preferable to increase the diameter of the opening SP1 when inserted into the inside. Alternatively, another opening having an opening diameter larger than that of the opening SP1 is provided, and when the second imaging optical system L2 is inserted into the first imaging optical system L1, the opening SP1 is replaced with another opening. You may comprise so that it may switch to a part. As a result, the light beam imaged by the second imaging optical system L2 is not scattered by the first imaging optical system L1.

Next, the optical characteristics of the first imaging optical system L1 and the second imaging optical system L2 in this embodiment will be described.

FIGS. 14A and 14B show the distortion of the imaging optical system of the present embodiment. FIG. 14A shows distortion in the first imaging optical system L1, and FIG. 14B shows distortion in the second imaging optical system L2. The distortions of the first imaging optical system L1 and the second imaging optical system L2 in this embodiment are extremely small as shown in FIGS. 14 (a) and 14 (b).

FIGS. 15A and 15B are lateral aberration diagrams of the imaging optical system of the present example. FIG. 15A is a lateral aberration diagram of the first imaging optical system L1, and FIG. 15B is a lateral aberration diagram of the second imaging optical system L2. The lateral aberration diagrams shown in FIGS. 15A and 15B are shown with respect to positions 1 to 5 on the image sensor shown in FIG.

In the YZ section, the focal length of the first imaging optical system L1 of the present embodiment is 17.91 mm, and the F number is 5.97. In the YZ section, the focal length of the second imaging optical system L2 is 71.65 mm, and the F number is 8.0.

[Example 5]
Next, Example 5 will be described. The imaging apparatus of the present embodiment has two imaging optical systems as in the first, third, and fourth embodiments. The appearance of the image pickup apparatus of the present embodiment is the same as that shown in FIGS. 1 (a) to 1 (d). However, the optical characteristics of the two imaging optical systems in the present embodiment are different from those in the first, third, and fourth embodiments. In this embodiment, the second imaging optical system that is inserted into and extracted from the first imaging optical system is composed of a plurality of lenses and prisms.

In the present embodiment, the first imaging optical system L1 is an off-axial optical system having four free-form reflecting surfaces. In the present embodiment, the second imaging optical system L2 is an Off-Axial optical system including four spherical lenses and one triangular prism.

FIG. 16A is a cross-sectional view of the first imaging optical system L1 in the present embodiment. FIG. 16B is a cross-sectional view of the second imaging optical system L2 in the present embodiment. FIG. 16C is a sectional view showing a state in which the second imaging optical system L2 is inserted into the first imaging optical system L1 in the present embodiment.

As shown in FIG. 16A, the light incident on the first surface R80 of the first imaging optical system L1 is reflected in order while converging or diverging from the second surface R81 to the fifth surface R84, and the image surface. Imaging with IMG. The first surface R80 is the entrance pupil of the first imaging optical system L1, and corresponds to the aperture (aperture stop) SP1 in FIGS. 1 (a) to 1 (d).

The second imaging optical system L2 is arranged in order from the object side to the image side, and a meniscus positive lens having a convex surface facing the image side, a meniscus negative lens having a convex surface facing the image side, and a reflecting surface A triangular prism, a biconvex positive lens, and a negative lens with a convex surface facing the image side. The positive lens disposed closest to the object side in the second imaging optical system L2 also serves as an aperture stop and corresponds to an entrance pupil. The second imaging optical system L2 of the present embodiment configured to include a refractive optical element has an advantage that it is easy to manufacture compared to a reflective optical system having a plurality of free-form surfaces.

More detailed shapes and the like of the first imaging optical system L1 and the second imaging optical system L2 in the present embodiment will be described in Numerical Example 5 later.

FIG. 16C is a cross-sectional view when the second imaging optical system L2 of the present embodiment is inserted into the first imaging optical system L1.

Next, the optical characteristics of the first imaging optical system L1 and the second imaging optical system L2 in this embodiment will be described.

FIGS. 17A and 17B show distortion of the imaging optical system of the present embodiment. FIG. 17A shows distortion in the first imaging optical system L1, and FIG. 17B shows distortion in the second imaging optical system L2. The distortions of the first imaging optical system L1 and the second imaging optical system L2 of this embodiment are extremely small as shown in FIGS. 17 (a) and 17 (b).

FIGS. 18A and 18B are lateral aberration diagrams of the imaging optical system of this example. FIG. 18A is a lateral aberration diagram of the first imaging optical system L1, and FIG. 18B is a lateral aberration diagram of the second imaging optical system L2. The lateral aberration diagram shown in FIG. 18A is shown for positions 1 to 5 on the image sensor shown in FIG. The lateral aberration diagram shown in FIG. 18B is shown for positions 1 to 5 on the image circle shown in FIG.

In the YZ cross section, the focal length of the first imaging optical system L1 of the present example is 71.65 mm, and the F number is 8.0. In the YZ section, the focal length of the second imaging optical system L2 is 17.91 mm, and the F number is 8.0.

Next, numerical examples corresponding to the imaging optical system in each of the above-described embodiments will be shown. Each numerical example is in a state of focusing on an object at infinity. The surface data indicates the coordinates (mm) in the absolute coordinate system of the points on the reference axis in each surface and the tilt angle (°) of the surface, excluding the second imaging optical system of Numerical Example 5. Di is a scalar quantity representing the distance between the origins of the local coordinates of the i-th surface and the (i + 1) -th surface.

In the surface data of the second imaging optical system of Numerical Example 5, i is the order of the surfaces from the object side, ri is the radius of curvature of the i-th surface from the object side, and di is the i-th surface from the object side. Ndi and νdi represent the refractive index and Abbe number of the optical member between the i-th surface and the (i + 1) -th surface. BF is the back focus in terms of air. E—X represents 10 ^—X .

In each embodiment, the spherical shape is expressed by the following equation (1), where ri is the radius of curvature of the i-th surface and x and y are coordinates in each local coordinate system of the i-th surface.

In each embodiment, the free-form surface shape is expressed by the following equation (2).

Since Equation (2) is only an even-order term with respect to x, the free-form surface defined by Equation (2) has a plane-symmetric shape with the yz plane as the symmetry plane.

[Numerical Example 1-First Imaging Optical System]
The angle of view is ± 1.86 ° in the X direction and ± 2.48 ° in the Y direction.
The focal length is 71.65 mm in the X direction and 71.65 mm in the Y direction.
The image plane size is 4.65 mm in the x direction and 6.20 mm in the y direction.
The first surface R10 is circular and has a diameter of 8.96 mm.
The F value in the X axis direction is 8.00, and the F value in the Y axis direction is 8.00.

Surface data surface number Xi Yi Zi Di θxi θyi
1 (R10) 0.00 0.00 0.00 40.00 0.00 0.00
2 (R11) 0.00 0.00 40.00 40.00 11.00 0.00 First reflective surface 3 (R12) 0.00 -14.98 2.91 36.00 -11.00 0.00 Second reflective surface 4 (R13) 0.00 -14.98 38.91 45.00 -19.00 0.00 Third reflective surface 5 (R14) 0.00 12.72 3.45 24.00 26.00 0.00 Fourth reflective surface 6 (R15) 0.00 18.53 26.74 53.53 38.00 0.00 Fifth reflective surface image surface (IMG) 0.00 -35.00 26.74 0.00 0.00

Free-form data 2nd surface (R11) 1st reflective surface
C20 = -7.7219E-03 C02 = -4.2924E-03 C21 = 9.8995E-05
C03 = -7.7248E-06 C40 = -4.1351E-07 C22 = -1.0099E-06
C04 = 1.9032E-07 C41 = -1.3142E-10 C23 = 3.9926E-09
C05 = -3.0502E-09 C60 = 1.4870E-08 C42 = 5.9771E-10
C24 = -5.6596E-10 C06 = 7.5010E-11 C60 = 1.4516E-10
C43 = 1.8655E-10 C25 = 2.9739E-11 C07 = -1.2587E-11
C80 = -2.2747E-10 C62 = -1.6996E-11 C44 = -1.5602E-11
C26 = 2.6932E-12 C08 = -1.5064E-13

3rd surface (R12) 2nd reflective surface
C20 = 6.7745E-03 C02 = -1.1708E-03 C21 = -2.3109E-04
C03 = 7.1582E-06 C40 = 1.8023E-06 C22 = -5.4476E-06
C04 = 1.3742E-06 C41 = -3.6639E-07 C23 = -6.2119E-08
C05 = -4.4260E-08 C60 = -4.5070E-07 C42 = -3.7793E-08
C24 = 1.3179E-08 C06 = -2.2325E-10 C60 = 2.8252E-07
C43 = -9.5435E-08 C25 = 3.4608E-09 C07 = -3.7969E-10
C80 = 5.1974E-08 C62 = 4.0008E-08 C44 = -1.6874E-08
C26 = 1.0054E-09 C08 = -7.9061E-11

4th surface (R13) 3rd reflective surface
C20 = -6.8875E-03 C02 = -4.9000E-03 C21 = -2.3094E-05
C03 = -3.5548E-05 C40 = 9.4480E-08 C22 = 4.8163E-07
C04 = 2.1256E-07 C41 = -2.5743E-08 C23 = -4.1325E-08
C05 = -5.4575E-09 C60 = -1.3763E-09 C42 = 4.1999E-10
C24 = 1.1998E-10 C06 = -1.2844E-10 C60 = 8.8422E-12
C43 = 2.1369E-10 C25 = -6.7900E-11 C07 = -2.2668E-11
C80 = 2.0387E-11 C62 = 3.4046E-12 C44 = -8.4044E-12
C26 = 2.2069E-11 C08 = 9.3176E-13

5th surface (R14) 4th reflective surface
C20 = 9.6880E-04 C02 = 3.0495E-03 C21 = -1.0450E-04
C03 = -7.0174E-05 C40 = -1.0598E-06 C22 = -2.9722E-06
C04 = -3.1156E-06 C41 = -3.1277E-08 C23 = -1.4166E-07
C05 = -1.3498E-07 C60 = 2.4905E-08 C42 = -4.1160E-09
C24 = -7.1603E-09 C06 = -5.6986E-09 C60 = -8.2893E-11
C43 = 4.1124E-10 C25 = -6.5948E-11 C07 = -3.0828E-10
C80 = -4.1903E-10 C62 = 3.7535E-11 C44 = 7.5462E-11
C26 = 1.4310E-11 C08 = -1.7744E-11

6th surface (R15) 5th reflective surface
C20 = -2.8637E-03 C02 = -3.7440E-03 C21 = 1.2838E-05
C03 = -4.3225E-05 C40 = -3.4750E-07 C22 = -2.6506E-06
C04 = -1.3963E-06 C41 = -1.2464E-08 C23 = -2.6233E-08
C05 = -2.4544E-08 C60 = 1.0694E-08 C42 = -3.7640E-09
C24 = -1.5270E-10 C06 = -1.0056E-09 C60 = 1.0694E-10
C43 = 6.8000E-10 C25 = 1.3447E-11 C07 = -1.2174E-10
C80 = -2.0423E-10 C62 = 8.4051E-11 C44 = 6.8613E-11
C26 = -4.1729E-11 C08 = -7.3438E-13

Focal length data for the axial light flux on each reflecting surface (fix is the focal length of the i-th reflecting surface in the x direction, and fiy is the focal length of the i-th reflecting surface in the y direction. The same applies to the following numerical examples).
f1x = 32.982 mm f1y = 57.172 mm
f2x = 37.594 mm f2y = -209.606 mm
f3x = 38.389 mm f3y = 48.241 mm
f4x = 287.108 mm f4y = 73.684 mm
f5x = 110.786 mm f5y = 52.618 mm

[Numerical Example 1—Second Imaging Optical System]
The angle of view is ± 7.40 ° in the X direction and ± 9.82 ° in the Y direction.
The focal length is 17.91 mm in the X direction and 17.91 mm in the Y direction.
The image plane size is 4.65 mm in the x direction and 6.20 mm in the y direction.
The first surface R20 is circular and has a diameter of 2.24 mm.
The F value in the X axis direction is 8.00, and the F value in the Y axis direction is 8.00.

Surface data surface number Xi Yi Zi Di θxi θyi
1 (R20) 0.00 0.00 0.00 30.00 0.00 0.00
2 (R21) 0.00 0.00 30.00 28.00 10.00 0.00 First reflective surface 3 (R22) 0.00 -9.58 3.69 25.00 -13.00 0.00 Second reflective surface 4 (R23) 0.00 -12.19 28.55 32.00 -19.00 0.00 Third reflective surface 5 (R24) 0.00 10.04 5.53 17.00 26.00 0.00 4th reflective surface 6 (R25) 0.00 12.41 22.37 47.41 41.00 0.00 5th reflective surface image surface (IMG) 0.00 -35.00 22.37 0.00 0.00

Free-form data 2nd surface (R21) 1st reflective surface
C20 = -1.3006E-02 C02 = -1.1409E-02 C21 = -2.2986E-04
C03 = 1.2070E-05 C40 = -3.7621E-06 C22 = -1.0194E-05
C04 = 1.0296E-06 C41 = -2.6648E-07 C23 = 4.9447E-08
C05 = -2.9010E-08 C60 = -4.7813E-09 C42 = 1.1215E-08
C24 = 3.5840E-10 C06 = -4.5631E-09 C60 = 5.1317E-09
C43 = 2.2967E-09 C25 = -1.3047E-09 C07 = 2.7855E-10
C80 = 2.5363E-10 C62 = 6.5924E-10 C44 = -1.5322E-10
C26 = 7.2553E-11 C08 = 4.0316E-11

3rd surface (R22) 2nd reflective surface
C20 = 2.9667E-03 C02 = 1.4595E-03 C21 = 1.5246E-03
C03 = -1.0807E-04 C40 = -6.9320E-06 C22 = -6.8515E-05
C04 = -2.7921E-06 C41 = 1.3563E-06 C23 = 3.1874E-06
C05 = 8.8318E-08 C60 = 9.2595E-07 C42 = -3.5347E-07
C24 = 4.0001E-07 C06 = -4.5950E-08 C60 = -4.6989E-08
C43 = 9.1490E-08 C25 = 6.5183E-08 C07 = -2.2248E-08
C80 = -7.9873E-08 C62 = 2.4536E-08 C44 = -2.3377E-08
C26 = -2.6562E-08 C08 = 3.2125E-09

4th surface (R23) 3rd reflective surface
C20 = -1.3393E-03 C02 = 5.5393E-04 C21 = 4.4302E-04
C03 = -6.3472E-05 C40 = 4.1455E-06 C22 = -6.3673E-06
C04 = -2.0399E-07 C41 = 1.0384E-06 C23 = -8.8449E-07
C05 = -1.1335E-07 C60 = -4.9241E-08 C42 = 2.5551E-07
C24 = 6.0826E-07 C06 = -2.1658E-08 C60 = -5.9467E-08
C43 = 9.4023E-08 C25 = 2.6562E-08 C07 = 4.7888E-09
C80 = -6.3428E-10 C62 = -1.1471E-09 C44 = -1.5733E-08
C26 = -2.2921E-08 C08 = 8.9385E-10

5th surface (R24) 4th reflective surface
C20 = 4.7321E-03 C02 = 4.9841E-03 C21 = 6.9652E-05
C03 = -3.9378E-05 C40 = 6.1954E-07 C22 = 1.2448E-06
C04 = -1.6757E-06 C41 = 1.6652E-07 C23 = 1.1462E-07
C05 = -9.2172E-08 C60 = -4.0244E-09 C42 = -2.4076E-08
C24 = 1.1632E-08 C06 = -2.9886E-09 C60 = 7.8085E-10
C43 = 1.1763E-09 C25 = -1.1734E-09 C07 = -8.6470E-11
C80 = -1.1153E-11 C62 = 3.2793E-10 C44 = -5.9399E-11
C26 = -2.1541E-10 C08 = 5.2901E-12

6th surface (R25) 5th reflective surface
C20 = -5.7783E-03 C02 = -2.7383E-03 C21 = 4.6744E-05
C03 = 2.0108E-06 C40 = 4.6547E-07 C22 = 2.8448E-06
C04 = -1.3642E-06 C41 = 1.2274E-07 C23 = 7.3930E-08
C05 = -3.2422E-08 C60 = -3.5765E-09 C42 = -1.3784E-08
C24 = 2.5123E-09 C06 = -1.8232E-09 C60 = 1.3342E-09
C43 = 2.5511E-10 C25 = -7.9154E-10 C07 = 7.9806E-12
C80 = -1.0800E-11 C62 = 1.9625E-10 C44 = -4.9972E-11
C26 = -3.7395E-11 C08 = 4.8805E-12

Focal length data for on-axis luminous flux of each reflecting surface
f1x = 19.519 mm f1y = 21.579 mm
f2x = 86.485 mm f2y = 166.902 mm
f3x = 197.419 mm f3y = -426.732 mm
f4x = 58.779 mm f4y = 45.083 mm
f5x = 57.327 mm f5y = 68.904 mm

[Numerical Example 2—Third Imaging Optical System]
The angle of view is ± 0.62 ° in the X direction and ± 0.83 ° in the Y direction.
The focal length is 214.98 mm in the X direction and 214.95 mm in the Y direction.
The image plane size is 4.65 mm in the x direction and 6.20 mm in the y direction.
The first surface R30 is circular and has a diameter of 19.5 mm.
The F value in the X-axis direction is 11.02, and the F value in the Y-axis direction is 11.02.

Surface data surface number Xi Yi Zi Di θxi θyi
1 (R30) 0.00 0.00 0.00 57.00 0.00 0.00
2 (R31) 0.00 0.00 57.00 57.00 10.00 0.00 First reflective surface 3 (R32) 0.00 -19.50 3.44 53.00 -11.00 0.00 Second reflective surface 4 (R33) 0.00 -21.34 56.41 65.00 -17.00 0.00 Third reflective surface 5 (R34) 0.00 16.86 3.82 31.00 26.00 0.00 4th reflective surface 6 (R35) 0.00 25.41 33.62 60.41 37.00 0.00 5th reflective surface image surface (IMG) 0.00 -35.00 33.62 0.00 0.00

Free-form data 2nd surface (R31) 1st reflective surface
C20 = -8.6661E-03 C02 = -1.4567E-03 C21 = 1.5768E-05
C03 = -1.3125E-06 C40 = -1.8162E-07 C22 = -5.8632E-08
C04 = 1.1225E-07 C41 = -5.8654E-10 C23 = -1.0201E-09
C05 = -1.1671E-09 C60 = -5.3529E-10 C42 = -6.0898E-12
C24 = 1.1026E-11 C06 = 3.2614E-11 C60 = -3.3531E-13
C43 = -1.4877E-12 C25 = -9.5755E-13 C07 = 5.9142E-13
C80 = -2.0141E-13 C62 = -5.1356E-14 C44 = -4.7674E-13
C26 = -2.9488E-13 C08 = 4.5537E-14

3rd surface (R32) 2nd reflective surface
C20 = 9.1712E-03 C02 = -1.4331E-03 C21 = 1.6261E-05
C03 = 3.2265E-05 C40 = 1.3861E-07 C22 = 3.3164E-07
C04 = 7.8851E-07 C41 = -1.7816E-09 C23 = 1.8317E-08
C05 = -9.7241E-09 C60 = 9.6172E-11 C42 = -1.7200E-11
C24 = -1.7071E-11 C06 = 7.2551E-10 C60 = -7.2382E-12
C43 = -1.1213E-11 C25 = -1.3765E-11 C07 = 6.7281E-12
C80 = 2.3994E-13 C62 = 9.6441E-13 C44 = 3.8422E-13
C26 = -4.2216E-14 C08 = -4.7923E-13

4th surface (R33) 3rd reflective surface
C20 = -2.0668E-03 C02 = -3.9068E-03 C21 = -4.0773E-07
C03 = -1.3303E-05 C40 = 3.9215E-07 C22 = 1.3735E-07
C04 = -9.4971E-07 C41 = 2.7216E-09 C23 = 1.3040E-08
C05 = -5.6551E-08 C60 = 7.9108E-10 C42 = 4.0658E-11
C24 = 2.3380E-10 C06 = -3.2568E-09 C60 = 7.7110E-12
C43 = -1.3356E-12 C25 = 1.5744E-11 C07 = -8.8218E-11
C80 = 5.4983E-13 C62 = 8.3570E-13 C44 = 1.9553E-12
C26 = 2.4717E-12 C08 = -1.2961E-12

5th surface (R34) 4th reflective surface
C20 = -8.5973E-04 C02 = 9.9833E-03 C21 = -4.1178E-05
C03 = 4.9253E-05 C40 = 1.2855E-06 C22 = -1.1201E-07
C04 = 1.3989E-06 C41 = 2.6698E-08 C23 = -7.4543E-08
C05 = 3.0287E-09 C60 = -2.2360E-09 C42 = -2.6779E-08
C24 = -6.1557E-08 C06 = 1.0160E-08 C60 = -2.2211E-11
C43 = 4.0368E-10 C25 = 3.8460E-09 C07 = 3.1813E-09
C80 = 7.0740E-12 C62 = 4.6634E-10 C44 = 2.2528E-09
C26 = 3.4047E-09 C08 = 1.5920E-10

6th surface (R35) 5th reflective surface
C20 = 1.4913E-03 C02 = -5.9072E-03 C21 = 1.3644E-05
C03 = -2.7893E-04 C40 = 5.2068E-07 C22 = 5.5143E-07
C04 = 6.5678E-06 C41 = -7.1779E-09 C23 = 9.6909E-09
C05 = -2.5290E-07 C60 = -5.9621E-09 C42 = 1.0785E-08
C24 = 2.5574E-08 C06 = 3.6792E-08 C60 = 5.7367E-10
C43 = -1.2131E-10 C25 = -1.1832E-09 C07 = 5.3316E-09
C80 = 1.0446E-10 C62 = -1.9725E-10 C44 = -7.8369E-10
C26 = -5.2472E-10 C08 = 5.2491E-11

Focal length data for on-axis luminous flux of each reflecting surface
f1x = 29.293 mm f1y = 169.010 mm
f2x = 27.770 mm f2y = -171.240 mm
f3x = 126.488 mm f3y = 61.195 mm
f4x = -323.534 mm f4y = 22.508 mm
f5x = -209.904 mm f5y = 33.800 mm

[Numerical Example 3—First Imaging Optical System]
The angle of view is ± 2.48 ° in the X direction and ± 1.86 ° in the Y direction.
The focal length is 71.63 mm in the X direction and 71.65 mm in the Y direction.
The image plane size is 6.20 mm in the x direction and 4.65 mm in the y direction.
The first surface R40 is circular and has a diameter of 8.96 mm.
The F value in the X axis direction is 8.00, and the F value in the Y axis direction is 8.00.

Surface data surface number Xi Yi Zi Di θxi θyi
1 (R40) 0.00 0.00 0.00 25.00 0.00 0.00
2 (R41) 0.00 0.00 25.00 21.00 -15.00 0.00 First reflective surface 3 (R42) 0.00 10.50 6.81 19.00 -28.00 0.00 Second reflective surface 4 (R43) 0.00 -8.45 8.14 25.00 -15.00 0.00 Third reflective surface 5 (R44) 0.00 14.02 19.10 28.00 13.00 0.00 4th reflective image plane (IMG) 0.00 -13.98 19.10 0.00 0.00

Free-form surface data 2nd surface (R41) 1st reflective surface
C20 = -9.6851E-04 C02 = -1.6382E-03 C21 = -2.7563E-07
C03 = -7.3475E-06 C40 = 3.2467E-07 C22 = 1.2440E-06
C04 = 2.7910E-07 C41 = 2.3177E-09 C23 = 3.9548E-08
C05 = 1.0987E-08 C60 = 5.3591E-09 C42 = 1.5138E-08
C24 = 6.8213E-09 C06 = 1.1146E-09 C60 = 6.1860E-10
C43 = 4.3260E-10 C25 = -4.2188E-10 C07 = 3.3197E-11
C80 = -1.8682E-10 C62 = -5.6301E-10 C44 = -7.0291E-10
C26 = -1.8045E-10 C08 = -9.8203E-12

3rd surface (R42) 2nd reflective surface
C20 = 1.4351E-03 C02 = 1.9088E-04 C21 = -2.5020E-06
C03 = -5.9554E-06 C40 = 5.4545E-07 C22 = 2.9345E-06
C04 = 5.8877E-07 C41 = 4.9083E-09 C23 = 1.6095E-08
C05 = 1.1321E-08 C60 = 6.2234E-09 C42 = 2.1551E-08
C24 = 9.3795E-09 C06 = 1.8957E-09 C60 = 8.3730E-10
C43 = 7.0942E-10 C25 = -8.7024E-10 C07 = -1.4456E-11
C80 = -2.9646E-10 C62 = -5.9367E-10 C44 = -1.0606E-09
C26 = -1.1098E-10 C08 = 4.7549E-12

4th surface (R43) 3rd reflective surface
C20 = -2.1823E-03 C02 = -1.8353E-03 C21 = -7.0071E-06
C03 = -2.8755E-06 C40 = 2.0059E-08 C22 = 2.5511E-06
C04 = 4.3568E-07 C41 = 9.9815E-10 C23 = -9.0890E-09
C05 = 1.9388E-08 C60 = 6.9399E-09 C42 = 3.1789E-08
C24 = 1.7870E-08 C06 = 3.3869E-09 C60 = 5.6110E-10
C43 = 1.2049E-09 C25 = -1.3043E-09 C07 = -1.8523E-10
C80 = -3.4212E-10 C62 = -5.6930E-10 C44 = -1.7893E-09
C26 = -7.6135E-12 C08 = 6.3786E-11

5th surface (R44) 4th reflective surface
C20 = -5.7370E-04 C02 = 6.2396E-04 C21 = -3.6500E-06
C03 = -3.0502E-06 C40 = -1.0155E-06 C22 = 4.3797E-07
C04 = -4.2621E-07 C41 = 5.8787E-08 C23 = 3.2461E-08
C05 = 3.5229E-08 C60 = 1.8499E-08 C42 = 5.2158E-08
C24 = 2.5269E-08 C06 = 7.4259E-11 C60 = -1.8883E-09
C43 = -1.0764E-09 C25 = 2.7881E-09 C07 = -7.3263E-10
C80 = -1.3321E-09 C62 = 1.4928E-10 C44 = -5.7184E-09
C26 = 1.8445E-09 C08 = 5.6683E-10

Focal length data for on-axis luminous flux of each reflecting surface
f1x = 267.235 mm f1y = 147.405 mm
f2x = 197.296 mm f2y = 1156.430 mm
f3x = 118.600 mm f3y = 131.578 mm
f4x = -447.230 mm f4y = 390.399 mm

[Numerical Example 3—Second Imaging Optical System]
The angle of view is ± 9.82 ° in the X direction and ± 7.40 ° in the Y direction.
The focal length is 17.91 mm in the X direction and 17.91 mm in the Y direction.
The image plane size is 6.20 mm in the x direction and 4.65 mm in the y direction.
The first surface R50 is circular and has a diameter of 2.24 mm.
The F value in the X axis direction is 8.00, and the F value in the Y axis direction is 8.00.

Surface data surface number Xi Yi Zi Di θxi θyi
1 (R50) 0.00 0.00 0.00 11.50 0.00 0.00 First refracting surface 2 (R51) 0.00 0.00 11.50 9.50 -11.00 0.00 First reflecting surface 3 (R52) 0.00 3.56 2.69 7.00 -26.00 0.00 Second reflecting surface 4 (R53) 0.00- 3.17 4.62 9.00 -20.00 0.00 Third reflective surface 5 (R54) 0.00 5.05 8.28 10.00 12.00 0.00 Fourth reflective surface 6 (R55) 0.00 -4.95 8.28 9.04 0.00 0.00 Second refractive surface image surface (IMG) 0.00 -13.98 8.28 0.00 0.00 IMG

Refractive index data d-line of the medium constituting the prism: 1.5311
g line: 1.5432
C line: 1.5283
F line: 1.5378

Free-form surface data 1st surface (R50) 1st refractive surface
C20 = -7.3094E-04 C02 = 1.1885E-03 C21 = -3.7160E-04
C03 = -6.6290E-04 C40 = -2.8983E-04 C22 = 2.5951E-04
C04 = -5.6954E-05 C41 = 0 C23 = 0
C05 = 0 C60 = 0 C42 = 0
C24 = 0 C06 = 0 C60 = 0
C43 = 0 C25 = 0 C07 = 0
C80 = 0 C62 = 0 C44 = 0
C26 = 0 C08 = 0

Second surface (R51) First reflective surface
C20 = -4.1874E-02 C02 = -1.0943E-02 C21 = -3.5200E-03
C03 = -4.0978E-04 C40 = 4.2519E-06 C22 = -4.4827E-04
C04 = -7.0714E-05 C41 = 2.8973E-05 C23 = -4.3018E-05
C05 = 5.8079E-07 C60 = -2.3453E-07 C42 = 8.3925E-06
C24 = 1.0622E-06 C06 = 8.6058E-07 C60 = -7.5231E-07
C43 = -5.3690E-08 C25 = -4.7292E-07 C07 = -1.3345E-06
C80 = 1.1281E-09 C62 = -1.8161E-07 C44 = -9.7343E-08
C26 = -3.9920E-07 C08 = 2.5430E-07

3rd surface (R52) 2nd reflective surface
C20 = 6.0622E-02 C02 = 2.2535E-02 C21 = 6.2664E-03
C03 = -6.7830E-04 C40 = 2.4556E-04 C22 = 9.1413E-04
C04 = 1.2966E-04 C41 = 1.1081E-04 C23 = 9.3169E-05
C05 = -3.0783E-05 C60 = 2.2444E-05 C42 = -1.1711E-05
C24 = 1.7149E-05 C06 = 6.6828E-06 C60 = -1.5236E-06
C43 = -6.0915E-07 C25 = -3.0053E-06 C07 = -1.5883E-08
C80 = -1.7996E-05 C62 = 2.3150E-05 C44 = -5.4819E-07
C26 = 8.1042E-08 C08 = -1.1805E-07

4th surface (R53) 3rd reflective surface
C20 = -6.2209E-03 C02 = -5.3092E-03 C21 = 2.3491E-04
C03 = 2.9430E-03 C40 = 4.9852E-05 C22 = 4.4870E-04
C04 = 3.6794E-04 C41 = -3.7843E-05 C23 = -6.4350E-05
C05 = -7.3309E-05 C60 = -1.7424E-07 C42 = -2.2383E-05
C24 = -1.9852E-05 C06 = -4.5558E-05 C60 = 1.8400E-06
C43 = -8.0132E-06 C25 = 4.9915E-05 C07 = -4.8562E-05
C80 = 4.0315E-08 C62 = 8.6824E-09 C44 = 3.6764E-05
C26 = -5.7012E-05 C08 = 1.2704E-04

5th surface (R54) 4th reflective surface
C20 = 1.8875E-02 C02 = 3.5771E-02 C21 = 1.2774E-03
C03 = 7.7340E-05 C40 = 1.1798E-05 C22 = -6.2301E-05
C04 = 1.2409E-05 C41 = -4.5093E-06 C23 = 9.1678E-06
C05 = 6.6219E-06 C60 = 1.5324E-07 C42 = 8.3399E-07
C24 = -5.3917E-07 C06 = 5.6967E-06 C60 = 6.0363E-08
C43 = -1.4358E-07 C25 = 1.6014E-07 C07 = 5.2628E-07
C80 = 5.8874E-10 C62 = -5.0843E-09 C44 = 6.4886E-08
C26 = 3.0201E-08 C08 = -5.4287E-07

6th surface (R55) 2nd refractive surface
C20 = 5.5511E-02 C02 = 4.6073E-02 C21 = -8.8590E-04
C03 = -4.5594E-03 C40 = -6.2276E-05 C22 = -1.0073E-04
C04 = 5.6478E-03 C41 = 1.9518E-05 C23 = 9.7473E-04
C05 = 3.8139E-04 C60 = 2.7276E-06 C42 = 6.1233E-05
C24 = -1.1971E-04 C06 = -1.1853E-05 C60 = 1.2066E-06
C43 = -2.0750E-05 C25 = 4.2182E-05 C07 = -2.9605E-05
C80 = 1.8368E-07 C62 = -2.1166E-06 C44 = 9.4032E-06
C26 = 1.3091E-05 C08 = 2.4689E-05

Focal length data for the light flux on the axis of each reflecting surface First transmitting surface f1x = -1287.99 mm f1y = 792.133 mm
First reflective surface f2x = 3.972 mm f2y = 14.646 mm
Second reflecting surface f3x = 2.997 mm f3y = 6.512 mm
Third reflective surface f4x = 27.932 mm f4y = 28.900 mm
Fourth reflective surface f5x = 8.844 mm f5y = 4.465 mm
Second transmission surface f6x = -16.960 mm f6y = -20.434 mm

[Numerical Example 4—First Imaging Optical System]
The angle of view is ± 7.40 ° in the X direction and ± 9.82 ° in the Y direction.
The focal length is 17.91 mm in the X direction and 17.91 mm in the Y direction.
The image plane size is 4.65 mm in the x direction and 6.20 mm in the y direction.
The first surface R60 is circular and has a diameter of 3.00 mm.
The F value in the X axis direction is 5.97, and the F value in the Y axis direction is 5.97.

Surface data surface number Xi Yi Zi Di θxi θyi
1 (R60) 0.00 0.00 0.00 30.00 0.00 0.00
2 (R61) 0.00 0.00 30.00 30.00 12.00 0.00 First reflective surface 3 (R62) 0.00 -12.20 2.59 27.00 -14.00 0.00 Second reflective surface 4 (R63) 0.00 -14.09 29.53 36.00 -21.00 0.00 Third reflective surface 5 (R64) 0.00 11.81 4.52 14.00 26.00 0.00 4th reflective surface 6 (R65) 0.00 13.27 18.44 36.27 42.00 0.00 5th reflective surface image surface (IMG) 0.00 -23.00 18.44 0.00 0.00

Free-form surface data 2nd surface (R61) 1st reflective surface
C20 = -1.1849E-02 C02 = -1.0607E-02 C21 = -2.3977E-04
C03 = -1.2754E-05 C40 = -5.2728E-06 C22 = -1.4164E-05
C04 = 1.2196E-06 C41 = -8.2631E-07 C23 = -5.8287E-08
C05 = -2.0877E-09 C60 = 2.6555E-09 C42 = -8.8692E-09
C24 = 1.5123E-08 C06 = -1.8240E-09 C60 = 1.5733E-08
C43 = 4.4639E-09 C25 = -9.4563E-10 C07 = 2.8419E-10
C80 = 4.9141E-10 C62 = 1.7490E-09 C44 = -2.0239E-10
C26 = -4.3355E-11 C08 = 1.4602E-11

3rd surface (R62) 2nd reflective surface
C20 = 4.8732E-03 C02 = 6.5515E-04 C21 = 1.3543E-03
C03 = -3.0394E-05 C40 = -3.5345E-06 C22 = -7.8867E-05
C04 = 1.3671E-07 C41 = 2.5025E-06 C23 = 3.3914E-06
C05 = 1.1651E-07 C60 = 2.3263E-07 C42 = -2.9986E-07
C24 = -5.1449E-08 C06 = -1.7020E-07 C60 = -8.1769E-08
C43 = 8.0296E-08 C25 = 6.3623E-08 C07 = -1.0593E-08
C80 = -1.4984E-08 C62 = 7.7631E-09 C44 = -1.4488E-08
C26 = -8.0964E-09 C08 = 5.2661E-09

4th surface (R63) 3rd reflective surface
C20 = -3.3709E-03 C02 = -3.2783E-03 C21 = 3.4993E-04
C03 = -4.2014E-05 C40 = 2.6432E-06 C22 = -6.6985E-06
C04 = -1.2922E-07 C41 = 5.2885E-07 C23 = -2.1170E-07
C05 = -1.1845E-07 C60 = -1.6295E-08 C42 = 1.5114E-07
C24 = 1.3110E-07 C06 = -1.9142E-08 C60 = -3.2961E-08
C43 = 3.0118E-08 C25 = 7.8137E-09 C07 = 2.8597E-09
C80 = -1.0802E-09 C62 = -3.9826E-09 C44 = 7.2686E-10
C26 = -1.2989E-09 C08 = 4.5982E-10

5th surface (R64) 4th reflective surface
C20 = 4.1462E-03 C02 = 3.8137E-03 C21 = 1.3681E-04
C03 = -1.1395E-04 C40 = 3.6354E-07 C22 = 1.9179E-06
C04 = -7.7444E-06 C41 = 2.2568E-07 C23 = 2.0398E-07
C05 = -5.1116E-07 C60 = -1.3020E-08 C42 = -5.5838E-08
C24 = 1.3111E-08 C06 = -3.2016E-08 C60 = 1.7461E-09
C43 = 2.1222E-09 C25 = -4.7752E-10 C07 = -1.4142E-09
C80 = 3.1691E-11 C62 = 6.5187E-10 C44 = 2.7977E-11
C26 = -1.8006E-10 C08 = 2.6990E-12

6th surface (R65) 5th reflective surface
C20 = -7.3010E-03 C02 = -3.6550E-03 C21 = 1.1180E-04
C03 = -4.9306E-05 C40 = 3.3023E-07 C22 = 5.3654E-06
C04 = -3.9064E-06 C41 = 1.0809E-07 C23 = 7.4197E-08
C05 = -1.2426E-07 C60 = -1.8337E-08 C42 = -3.1374E-08
C24 = -4.3353E-09 C06 = -9.0699E-09 C60 = 3.1742E-09
C43 = -1.3700E-10 C25 = -1.3583E-09 C07 = -1.6529E-10
C80 = 4.1803E-11 C62 = 3.1765E-10 C44 = -8.4932E-11
C26 = -2.1445E-11 C08 = 5.6011E-12

Focal length data for on-axis luminous flux of each reflecting surface
f1x = 21.570 mm f1y = 23.053 mm
f2x = 52.872 mm f2y = 370.258 mm
f3x = 79.441 mm f3y = 71.194 mm
f4x = 67.086 mm f4y = 58.919 mm
f5x = 46.077 mm f5y = 50.831 mm

[Numerical Example 4—Second Imaging Optical System]
The angle of view is ± 1.86 ° in the X direction and ± 2.48 ° in the Y direction.
The focal length is 71.65 mm in the X direction and 71.65 mm in the Y direction.
The image plane size is 4.65 mm in the x direction and 6.20 mm in the y direction.
The first surface R70 is circular and has a diameter of 8.96 mm.
The F value in the X axis direction is 7.9, and the F value in the Y axis direction is 7.9.

Surface data surface number Xi Yi Zi Di θxi θyi
1 (R70) 0.00 0.00 0.00 21.00 0.00 0.00
2 (R71) 0.00 0.00 21.00 22.00 13.00 0.00 First reflective surface 3 (R72) 0.00 -9.64 1.23 19.00 -15.00 0.00 Second reflective surface 4 (R73) 0.00 -10.97 20.18 26.00 -21.00 0.00 Third reflective surface 5 (R74) 0.00 7.73 2.12 11.00 27.00 0.00 4th reflective surface 6 (R75) 0.00 9.26 13.01 32.26 41.00 0.00 5th reflective surface image surface (IMG) 0.00 -23.00 13.01 0.00 0.00

Free-form data 2nd surface (R71) 1st reflective surface
C20 = -1.3097E-02 C02 = -6.5662E-03 C21 = 4.0277E-04
C03 = -4.5591E-05 C40 = 2.0463E-06 C22 = -2.5201E-06
C04 = -8.2150E-07 C41 = -3.1869E-08 C23 = 1.0790E-08
C05 = 7.1138E-08 C60 = 3.4528E-09 C42 = -1.3542E-09
C24 = 5.6874E-09 C06 = -1.0687E-08 C60 = -2.5661E-10
C43 = 8.4152E-10 C25 = -1.5245E-09 C07 = 1.2188E-09
C80 = -6.8661E-11 C62 = 8.0214E-11 C44 = -2.1675E-11
C26 = 4.5006E-10 C08 = -4.8284E-11

3rd surface (R72) 2nd reflective surface
C20 = 1.0214E-02 C02 = -1.0926E-02 C21 = 4.9822E-06
C03 = 3.4616E-04 C40 = -6.1899E-05 C22 = -5.3191E-05
C04 = -8.3220E-06 C41 = -5.7063E-06 C23 = 4.4775E-06
C05 = 3.7873E-06 C60 = 1.3021E-05 C42 = 6.1850E-06
C24 = 7.3067E-07 C06 = -2.6194E-07 C60 = 1.3438E-06
C43 = -8.8786E-07 C25 = -8.2660E-07 C07 = -3.2418E-08
C80 = -1.9257E-06 C62 = -1.3107E-06 C44 = -6.0038E-07
C26 = -8.1111E-08 C08 = 4.1425E-09

4th surface (R73) 3rd reflective surface
C20 = -1.6793E-02 C02 = -1.5250E-02 C21 = 6.8184E-05
C03 = 3.8297E-05 C40 = -4.6483E-06 C22 = -1.0220E-05
C04 = -5.8580E-06 C41 = 8.0382E-08 C23 = 2.5410E-07
C05 = 1.0292E-07 C60 = -5.0842E-09 C42 = -1.2848E-08
C24 = -5.1362E-10 C06 = -2.0783E-08 C60 = 4.0373E-10
C43 = -1.8448E-09 C25 = 1.2830E-11 C07 = -3.2549E-09
C80 = 4.5851E-11 C62 = -7.2414E-11 C44 = -1.3814E-10
C26 = 9.8425E-10 C08 = -7.4979E-11

5th surface (R74) 4th reflective surface
C20 = -2.7919E-03 C02 = 1.0948E-02 C21 = -1.8137E-03
C03 = 3.8375E-04 C40 = -1.5087E-05 C22 = -1.3172E-05
C04 = -2.3843E-05 C41 = -3.6027E-07 C23 = -1.3487E-06
C05 = -3.9800E-06 C60 = 6.7006E-08 C42 = -3.0649E-07
C24 = 2.1746E-07 C06 = -5.7690E-07 C60 = 4.4161E-09
C43 = -6.1052E-08 C25 = 6.1649E-08 C07 = -1.2750E-07
C80 = -4.1923E-09 C62 = 1.3662E-08 C44 = 2.7702E-08
C26 = 1.6826E-08 C08 = -3.2237E-08

6th surface (R75) 5th reflective surface
C20 = -2.2621E-03 C02 = -8.0290E-03 C21 = -3.5769E-04
C03 = -1.6503E-04 C40 = 1.6452E-06 C22 = -3.3962E-05
C04 = 1.1040E-05 C41 = 8.8354E-07 C23 = -2.5143E-06
C05 = 7.1143E-07 C60 = 1.2133E-07 C42 = -1.3257E-07
C24 = 4.8156E-09 C06 = 6.3194E-08 C60 = 1.5081E-08
C43 = 4.9038E-08 C25 = 2.1104E-09 C07 = 1.0194E-08
C80 = -6.5378E-09 C62 = -1.6927E-09 C44 = 8.2618E-10
C26 = -1.4545E-08 C08 = -1.4402E-10

Focal length data for on-axis luminous flux of each reflecting surface
f1x = 19.591 mm f1y = 37.098 mm
f2x = 25.341 mm f2y = -22.101 mm
f3x = 15.947 mm f3y = 15.304 mm
f4x = -100.498 mm f4y = 20.346 mm
f5x = 146.434 mm f5y = 23.499 mm

[Numerical Example 5—First Imaging Optical System]
The angle of view is ± 2.48 ° in the X direction and ± 1.86 ° in the Y direction.
The focal length is 71.63 mm in the X direction and 71.65 mm in the Y direction.
The image plane size is 6.20 mm in the x direction and 4.65 mm in the y direction.
The first surface R80 is circular and has a diameter of 8.96 mm.
The F value in the X-axis direction is 7.99, and the F value in the Y-axis direction is 8.00.

Surface data surface number Xi Yi Zi Di θxi θyi
1 (R80) 0.00 0.00 0.00 30.00 0.00 0.00
2 (R81) 0.00 0.00 30.00 27.00 -15.00 0.00 First reflective surface 3 (R82) 0.00 13.50 6.62 24.00 -28.00 0.00 Second reflective surface 4 (R83) 0.00 -10.44 8.29 30.00 -15.00 0.00 Third reflective surface 5 (R84) 0.00 16.52 21.44 37.32.

Free-form surface data 2nd surface (R81) 1st reflective surface
C20 = 1.6573E-03 C02 = -4.9492E-04 C21 = 5.7515E-06
C03 = -8.4053E-06 C40 = -1.1915E-07 C22 = -2.5296E-08
C04 = -2.2552E-07 C41 = 9.7021E-08 C23 = 4.1303E-08
C05 = -1.3955E-09 C60 = 1.3621E-08 C42 = 5.3892E-08
C24 = 2.3890E-08 C06 = 2.9568E-09 C60 = -1.9392E-09
C43 = -1.1327E-10 C25 = -4.1682E-10 C07 = 1.3528E-10
C80 = -1.7405E-10 C62 = -1.0536E-09 C44 = -8.7215E-10
C26 = -2.2739E-10 C08 = 8.6178E-12

3rd surface (R82) 2nd reflective surface
C20 = 1.2986E-03 C02 = 1.7238E-04 C21 = 1.5345E-05
C03 = -1.6647E-05 C40 = -6.9248E-07 C22 = -3.1052E-07
C04 = -4.7187E-07 C41 = 1.2671E-07 C23 = 9.2417E-08
C05 = 1.6648E-08 C60 = 7.5234E-09 C42 = 3.8913E-08
C24 = 2.1299E-08 C06 = 6.5888E-09 C60 = -1.4243E-09
C43 = -8.9807E-10 C25 = -1.0820E-09 C07 = -2.9560E-11
C80 = -4.5870E-11 C62 = -3.6597E-10 C44 = -3.9172E-10
C26 = -1.6850E-10 C08 = -2.6644E-11

4th surface (R83) 3rd reflective surface
C20 = -5.0948E-03 C02 = -2.5056E-03 C21 = -6.3293E-06
C03 = -2.2971E-05 C40 = -7.4058E-07 C22 = -8.4193E-07
C04 = -6.4218E-07 C41 = 7.6108E-08 C23 = 6.0598E-08
C05 = 2.8273E-08 C60 = 3.5155E-09 C42 = 2.1456E-08
C24 = 1.3892E-08 C06 = 1.0271E-08 C60 = -6.5060E-10
C43 = -5.3615E-10 C25 = -9.5256E-10 C07 = -1.6459E-10
C80 = -1.6210E-11 C62 = -1.3117E-10 C44 = -2.0857E-10
C26 = -1.1243E-10 C08 = -7.5599E-11

5th surface (R84) 4th reflective surface
C20 = -4.2285E-03 C02 = 9.6427E-04 C21 = -1.6362E-05
C03 = -2.1208E-05 C40 = -2.7846E-06 C22 = -1.8770E-06
C04 = -1.4132E-06 C41 = 3.0886E-07 C23 = 1.4701E-07
C05 = 4.9844E-08 C60 = 3.4521E-08 C42 = 1.0056E-07
C24 = 2.4949E-08 C06 = 3.3659E-08 C60 = -8.3751E-09
C43 = -3.9621E-09 C25 = -3.9225E-09 C07 = -7.6975E-10
C80 = -5.0435E-10 C62 = -1.3276E-09 C44 = -1.3957E-09
C26 = -3.7318E-10 C08 = -5.9170E-10

Focal length data for on-axis luminous flux of each reflecting surface
f1x = -156.167 mm f1y = 487.918 mm
f2x = 218.037 mm f2y = 1280.540 mm
f3x = 50.801 mm f3y = 96.3785 mm
f4x =-60.678 mm f4y = 252.619 mm

[Numerical Example 5—Second Imaging Optical System]
Surface number ri di ndi vdi Effective diameter
R90, R91 -10.441 1.00 1.60311 60.6 2.24
R92 -3.948 0.20 2.49
R93 -3.315 2.00 1.75520 27.5 2.50
R94 -5.048 2.00 3.30
R95 0.000 3.00 1.69680 55.5 3.74 Prism entrance surface
R96 0.000 3.00 1.69680 55.5 5.46 Prism reflecting surface
R97 0.000 7.50 4.42 Prism exit surface
R98 18.126 1.50 1.51633 64.1 5.93
R99 -8.330 1.90 5.94
R100 -6.707 1.00 1.71736 29.5 5.18
R101 -403.187 5.90 5.38
Image plane (IMG) 0.000


Various data focal length 17.91
F number 8.01
Half angle of view (°) 12.22
Statue height 3.875
Total lens length 29.000
BF 5.900

Entrance pupil position 0.000
Exit pupil position -13.79
Front principal point position 1.62
Rear principal point position -12.01

Single lens data lens Start surface Focal length 1 1 9.95
2 3 -25.40
3 8 11.27
4 10 -9.52

The preferred embodiments and examples of the present invention have been described above, but the present invention is not limited to these embodiments and examples, and various combinations, modifications, and changes are possible within the scope of the gist. For example, in each of the above-described embodiments, the example in which the second imaging optical system L2 is moved with respect to the first imaging optical system L1 has been described, but the first imaging optical system L1 is used as the second imaging optical system L1. You may move with respect to the optical system L2. Therefore, in order to make the scope of the present invention public, the following claims are attached.

This application claims priority on the basis of Japanese Patent Application No. 2018-069293 filed on Mar. 30, 2018, the entire contents of which are incorporated herein by reference.

L1 First imaging optical system L2 Second imaging optical system 100 Imaging device (optical device)

Claims (19)

An optical apparatus having first and second imaging optical systems, wherein the first and second imaging optical systems can be switched and used.
In a state where the first imaging optical system is used, the second imaging optical system is disposed at a position that does not block the optical path of the first imaging optical system,
The optical apparatus, wherein the second imaging optical system is disposed at a position that blocks the optical path when the second imaging optical system is used. The optical device has an image sensor,
2. The image according to claim 1, wherein an image is acquired by using the imaging element regardless of which of the first imaging optical system and the second imaging optical system is used. Optical device. An optical apparatus having first and second imaging optical systems and an image sensor, wherein the first and second imaging optical systems can be switched and used.
Regardless of which of the first imaging optical system and the second imaging optical system is used, an image is acquired using the imaging element,
In the switching, the relative position relationship between the first and second imaging optical systems is such that the second imaging optical system is withdrawn from a space through which light rays imaged by the first imaging optical system pass. And a state in which the second imaging optical system is inserted into the space, and
The optical apparatus according to claim 1, wherein a relative positional relationship between the first imaging optical system and the imaging element does not change before and after the switching. 4. The optical apparatus according to claim 2, wherein the optical apparatus performs focusing by moving the imaging element. 5. The optical apparatus according to claim 2, wherein the optical apparatus performs image blur correction by moving the imaging element. The optical apparatus according to any one of claims 1 to 5, wherein an angle of view of the first imaging optical system and an angle of view of the second imaging optical system are different from each other. The optical apparatus according to claim 6, wherein the second imaging optical system has a wider angle of view than the first imaging optical system. 8. The first imaging optical system includes a plurality of reflecting surfaces, and a space between the reflecting surfaces is filled with a gas. Optical device. 9. The optical apparatus according to claim 8, wherein an entrance pupil of the first imaging optical system is located closer to an object side than a reflecting surface arranged closest to the object side among the plurality of reflecting surfaces. 10. The optical apparatus according to claim 8, wherein the first imaging optical system is configured by only a reflecting surface. 11. The optical apparatus according to claim 1, wherein the first imaging optical system has a free-form curved reflecting surface. 12. The optical apparatus according to claim 1, wherein the second imaging optical system has a free-form curved reflecting surface. 13. The optical apparatus according to claim 1, wherein the first imaging optical system has an intermediate imaging plane. 14. The optical apparatus according to claim 1, wherein the second imaging optical system has an intermediate imaging plane. 15. The open F number for the axial light beam of the first imaging optical system and the open F number for the axial light beam of the second imaging optical system are the same. The optical device according to one item. An opening through which light from an object is incident when the first imaging optical system is used;
The light from the object is incident on the second imaging optical system through at least a partial region of the opening in a state where the second imaging optical system is used. The optical device according to any one of 1 to 15. A third imaging optical system;
When the optical device uses the third imaging optical system, the first imaging optical system and the second imaging optical system are imaged by the third imaging optical system. Changing the relative positional relationship of the first to third imaging optical systems so as to be retracted from the space through which the light beam passes,
When using the first imaging optical system or the second imaging optical system, the imaging optical system to be used is inserted into a space through which the light beam imaged by the third imaging optical system passes. The optical device according to any one of claims 1 to 16, wherein the relative positional relationship of the first to third imaging optical systems is changed as described above. The optical apparatus according to any one of claims 1 to 16, wherein the second imaging optical system includes a prism including a plurality of reflecting surfaces. The optical apparatus according to claim 1, wherein the second imaging optical system includes a plurality of lenses and a prism having a reflecting surface.

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