JPH10319314A - Relay lens optical system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a compact optical system obtaining high image quality and provided with many usable interchangeable lenses and to reduce the drop of illuminace by constituting the optical system of a condenser lens group and an image-formation lens group having positive power and satisfying a specified condition in order from a primary image surface side. SOLUTION: This relay lens optical system is provided with a condenser lens group Gr1 having positive power and an imageformation lens group Gr2 having the positive power and satisfies the condition of 0.9<|Dcr.β/f1| in order from the image-formation surface of a photographing lens group GrS. Provided that Dcr is a distance from the apex of the side surface nearest to an image side of the lens group Gr1 to the lens group Gr2, β is relay magnification, and f1 is the focal distance of an entire system. The lens group Gr1 is constituted of 1st and 2nd positive lenses in order from an object side, and the lens group Gr2 is constituted of 3rd and 4th positive lenses whose convex surfaces face to the object side, a 5th cemented lens consisting of a positive lens and a negative lens, a 6th negative lens whose concave surface faces to the object side, and 7th to 9th positive lenses whose convex surfaces face to the object side in order from the object side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relay lens optical system for re-forming a primary image as a secondary image, and more particularly, to relaying a primary image formed by, for example, a single-lens reflex camera to form a solid-state image. The present invention relates to a relay lens optical system suitable for an optical system for re-forming a secondary image on a light receiving element surface such as an imaging element.

[0002]

2. Description of the Related Art In recent years, products using solid-state imaging devices such as video cameras and electronic still cameras have become remarkably popular. As one form of such a product, an electronic still camera using a single-lens reflex camera has emerged from the advantages of cost reduction and the use of many types of interchangeable lenses for single-lens reflex cameras.

In the case of an electronic still camera utilizing a part of an existing single-lens reflex camera system, an image forming method is two-dimensional.
There are different ways. One is to place a solid-state image sensor such as a CCD on the primary image plane formed by an SLR interchangeable lens, and the other is to relay and replay the primary image created by a SLR interchangeable lens. This is a method in which a solid-state imaging device such as a CCD is placed on a formed secondary image plane.

When the solid-state imaging device is placed on the former primary image plane, the same specifications can be theoretically obtained with the same performance as a general single-lens reflex camera. In such a camera, a solid-state imaging device having a diagonal length of about 28 mm and a number of pixels of about 1.2 million or more, in order to use the viewfinder of a single-lens reflex camera as it is and to obtain almost the same image quality as a single-lens reflex camera Is required. However, there is a problem that such a large solid-state imaging device is very expensive.

[0005] For this reason, it is 1/2
It is necessary to use an inch or 1/3 inch solid-state imaging device. However, the image height of a single-lens reflex camera is Y '= 13.85 mm (APS
classic format) and 1/2 'solid-state image sensor Y' = 4
And the solid-state imaging device of 2/3 inches has Y '= 5.5. If these solid-state imaging devices are placed directly on the primary imaging image plane, the interchangeable lens for a single-lens reflex camera becomes a telephoto lens of about 4 to 5 times.

On the other hand, in the latter case, the primary image is reduced by an imaging lens system to approach the angle of view of a single-lens reflex camera. For example, as shown in FIG. 13, the primary image formed by the photographing lens group GrS is further reduced by a condenser lens group Gr1 and an imaging lens group Gr2 to a secondary imaging plane and re-imaged, thereby By using a relatively inexpensive solid-state imaging device having a size of 1/2 inch or 2/3 inch, an electronic still camera can be configured without deteriorating image information.

On the other hand, when considering such an electronic still camera, compactness is very important in addition to cost. If the size of the primary imaging surface and the size of the solid-state imaging device are determined, the approximate size of the relay lens optical system will be determined, but from the vertex of the condenser lens group most image side to the vertex of the imaging lens group most object side. By bending the optical path of the above, it is possible to make the whole compact. As an example of bending the optical path, the configuration shown in FIG. 14 can be considered. In this example, the optical path is bent three times, and the configuration is compact.

In order to bend the optical path, it is necessary to provide a reflecting mirror. For this purpose, it is necessary to secure a certain distance from the vertex of the image side of the condenser lens group to the vertex of the object side of the imaging lens group. On the other hand, if the solid-state imaging device to be used for the primary image formation is determined, the relay magnification is determined. However, increasing the distance from the vertex of the image side of the condenser lens to the vertex of the object side of the relay lens tends to reduce the magnification. To form a secondary image smaller than the effective surface of the solid-state imaging device.

As described above, it is contradictory to increase the distance from the vertex of the most image side surface of the condenser lens group to the vertex of the most object side surface of the imaging lens group while securing the relay magnification.

In the case of such an electronic still camera, it is necessary that a plurality of photographing lenses can be used. For this purpose, the allowable range of the relay lens optical system is changed with respect to a change in the position of the plurality of photographing lens exit pupils. Widening is also an important issue.

As an optical system of an electronic still camera, the optical systems described in JP-A-63-205626 and JP-A-8-114742 are known.

[0012]

However, in the former optical system described in Japanese Patent Application Laid-Open No. 63-205626, the primary image plane formed by a single-lens reflex interchangeable lens is reduced to about 0.5 times by a relay lens system. It has a configuration. However,
In this optical system, the optical path is bent only once because the distance from the top image side vertex of the condenser lens group to the top object side vertex of the imaging lens group is short, and the relay unit projects greatly to the rear and left of the camera. There was a problem that would.

In the latter optical system described in Japanese Patent Application Laid-Open No. 8-114742, the distance from the vertex of the most image side of the condenser lens group to the vertex of the most object side of the imaging lens group is such that the optical path can be bent about three times. However, since the relay magnification is small, a small solid-state imaging device must be used, and the CCD is limited to a CCD having a small number of pixels.

Furthermore, in the optical systems described in the above publications,
When using multiple photographing lenses, the tolerance range for matching the exit pupil position of the photographing lens and the entrance pupil position of the relay lens system is not always wide. Problems such as vignetting of the light beam and reduced illuminance occur.

The present invention has been made in view of such a situation, and has been developed to provide a relay lens optical system that is compact, has high image quality, has many usable interchangeable lenses, and has little illuminance loss on the final image plane. The purpose is to provide.

[0016]

According to a first aspect of the present invention, there is provided a relay lens optical system, comprising:
A relay lens optical system for re-imaging as a next image,
It is composed of a condenser lens group having a positive power and an imaging lens group having a positive power in order from the primary image surface side, and satisfies the following conditions.

0.9 <| Dcr · β / fl |, where Dcr is the distance from the vertex of the condenser lens group most image side to the vertex of the imaging lens group most object side, β: relay magnification, fl: focal length of the whole system, It is.

A relay lens optical system according to a second aspect is a relay lens optical system for re-imaging a primary image as a secondary image, wherein the condenser having a positive power in order from the primary image surface side. It is composed of a lens group and an imaging lens group having a positive power, and satisfies the following conditions.

0.7 <| flr / flc | where, flr: focal length of the imaging lens group flc: focal length of the condenser lens group

The relay lens optical system according to claim 3 is the relay lens optical system according to claim 1 or 2, wherein the imaging lens group includes a front group and a rear group in order from the primary image plane side. And satisfies the following conditions.

1.1 <| flr / flrf | where, flr: focal length of the imaging lens group flrf: focal length of the front group of the imaging lens group

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a relay lens optical system embodying the present invention will be described with reference to the drawings. Figures 1-4
FIG. 3 shows a lens configuration diagram of a photographing lens system and a relay lens optical system of the first to fourth embodiments.

The relay lens optical system according to the first to fourth embodiments includes a condenser lens group (Gr1) having a positive power and an image formation having a positive power in order from the imaging surface of the photographing lens group (GrS). This is a relay lens optical system having a lens group (Gr2).

The condenser lens group (Gr
1) is composed of a first positive lens G1 and a second positive lens G2 in order from the object side.

The imaging lens unit (Gr2) according to the first embodiment includes a third positive lens G3 having a strong convex surface facing the object side, a fourth positive lens G4 having a strong convex surface facing the object side, and a positive lens. And the fifth cemented lens G5 with a negative lens, the sixth negative lens G6 with a strong concave surface facing the object side, and the seventh positive lens with a strong convex surface facing the image surface side
G7, an eighth positive lens G8, and a ninth positive lens G9.

The condenser lens group (Gr1) of the second embodiment
Is composed of a first positive lens G1 and a second positive lens G2 in order from the object side.

The imaging lens unit (Gr2) according to the second embodiment includes a third positive lens G3 having a strong convex surface facing the image surface in order from the object side, and a fourth cemented lens of a positive lens and a negative lens convex to the object side. G4, 5th
Negative lens G5, 6th positive lens G with strong convex surface facing the image side
6, a seventh cemented lens G7 in which two positive lenses are cemented, and an eighth meniscus lens G8 convex on the object side.

Imaging lens group (Gr2) of the third and fourth embodiments
Is a third positive lens G3 having a strong convex surface facing the object side in order from the object side, a fourth cemented lens G4 of a positive lens and a negative lens convex on the object side, a fifth concave lens G5 of a biconcave, strong on the image surface side Convex sixth positive lens G6, seventh positive lens G7, eighth convex with strong convex surface facing the object side
It consists of a positive lens G8.

The condenser lens group (Gr1) is usually placed near the primary image plane so that there is no loss of light quantity. This indicates that the field curvature of the re-imaged secondary image is greatly affected. If the condenser lens group (Gr1) is constituted by only one positive lens, the field curvature becomes large, This curvature of field cannot be corrected by the imaging lens group (Gr2). Therefore, in order to minimize the number of lenses and to reduce the field curvature, the configuration of two positive lenses is the best.

When the condenser lens group (Gr1) is composed of two positive lenses, the shape of the positive lens is
It is preferable that the positive lens has a positive lens having a flat surface or a surface close to a flat surface facing the object side and a positive lens having a flat surface or a surface close to the flat surface facing the image side in order from the object side. With such a configuration, the field curvature can be minimized.

In the relay lens system of each embodiment, the condenser lens group (Gr1) and the imaging lens group (Gr2) are used to bend the optical path by a mirror or the like to make a compact configuration.
There is a relatively large air gap between them. As a result, the volume of the entire optical system can be minimized, but the pupil magnification of the photographic lens and the relay lens optical system takes a large negative value. When the pupil magnification becomes large, the difference in the pupil position due to the difference in the photographing lens becomes a large difference between the entrance pupil position and the exit pupil position in the relay lens optical system. This means that there is a model that causes vignetting in the light beam and a decrease in the peripheral light amount by replacing the photographing lens. There are many interchangeable lenses with different focal lengths in photographing lenses such as single-lens reflex cameras, and the difference between the exit pupil positions of these interchangeable lenses is as large as 40 mm or more.

In order to cope with these many photographing lenses, in the present invention, when the pupil is placed at a position of about 40 to 80 mm from the primary image forming surface to the object side, the peripheral light amount ratio always becomes about 50% or more. Thus, the effective diameter of the imaging lens group is taken. For this reason, the relay lens optical system alone is brighter than the F number (Fno) used.

In the relay lens optical systems of the second to fourth embodiments, the aspherical surface is provided for the lens closest to the object and the lens closest to the image plane in the imaging lens unit (Gr2). In this way, by providing at least one aspheric surface on the most object side lens of the imaging lens group (Gr2) or the most image side lens, the most object side lens of the imaging lens group (Gr2) and Astigmatism generated by the lens closest to the image plane can be satisfactorily corrected.

It is desirable that the configuration of the relay lens optical system of each embodiment satisfies the following conditional expression range (1). 0.9 <| Dcrβ / fl | ・ ・ ・ ・ ・ ・ (1) Here, Dcr: distance from the vertex of the image side of the condenser lens group to the vertex of the object side of the imaging lens group, β: relay magnification, fl: relay lens optics The focal length of the system,

The above conditional expression range represents the ratio of the focal length of the relay lens optical system multiplied by the distance multiplied by the distance from the top image side vertex of the condenser lens group to the top object side vertex of the imaging lens group. If the lower limit of the range of the conditional expression is exceeded, it is impossible to simultaneously bend the optical path three times or more and obtain a large magnification.

It is desirable that the following conditional expression range be satisfied in addition to the above conditional expression range.

0.9 <| Dcrβ / fl | <4 (1) 'The above conditional expression range further defines the upper limit of the above conditional expression range. Exceeding the upper limit of the conditional expression range causes problems such as vignetting of the light beam and illuminance drop when the pupil position moves greatly after replacing the shooting lens. It has to be very large and lacks compactness.

Further, in the configuration of the relay lens optical system of each embodiment, the power of the air lens in the imaging lens is maximized near the place where the light flux transmitted through the imaging lens group becomes the thinnest. It is preferable that the following conditional expression (2) be satisfied when the object side is a front group and the image side is a rear group with the part where the boundary is located. 1.1 <| flr / flrf | (2) where flr is the focal length of the imaging lens group. Flrf is the focal length of the front group of the imaging lens group.

The conditional expression range represents the relationship between the power of the front group of the imaging lens and the focal length of the relay lens optical system. When the lower limit of the conditional expression range is exceeded, the lens diameter on the rear side of the imaging lens increases, the compactness is lost, and furthermore, the optical path from the vertex of the condenser lens group most image side to the vertex of the imaging lens group most object side. The degree of freedom in bending is reduced.

It is desirable that the following conditional expression range be satisfied in addition to the conditional expression range.

1.1 <| flr / flrf | <2.5 (2) 'The above conditional expression range further defines the upper limit of the conditional expression range. When the value exceeds the upper limit of the conditional expression range, the lens diameter on the front side of the imaging lens increases, the compactness is lost, and how to bend the optical path from the vertex of the condenser lens group most image side to the vertex of the imaging lens group most object side. At the same time, when a lens close to the pupil of the photographing lens is attached, problems such as vignetting of light, illuminance drop, and astigmatism are likely to occur.

It is desirable that the relay lens optical system of each embodiment satisfies the following conditional expression range (3). 0.7 <| flr / flc | <1.5 (3) where flr is the focal length of the imaging lens, and flc is the focal length of the condenser lens.

The above conditional expression range is generalized by dividing the ratio of the focal length of the imaging lens to the focal length of the condenser lens group by the focal length of the relay lens optical system. If the lower limit of the conditional expression range is exceeded, the refractive index of the condenser lens group becomes weaker with respect to the focal length of the relay lens optical system. And other problems occur. When the value exceeds the upper limit of the conditional expression range, the angle of the light beam entering the imaging lens becomes strong, so that the lens becomes a wide-angle lens, and it is generally difficult to correct aberration.

It is desirable that the relay lens optical system of each embodiment satisfies the following conditional expression range (4). 0.41 <Drelay / Dcr <1 ································································································································································ (4) where Dcr is the distance from the vertex of the condenser lens group to the vertex of the imaging lens group. .

The conditional expression range represents the ratio of the distance from the vertex of the most image side surface of the condenser lens group to the vertex of the most object side surface of the imaging lens group and the total length of the imaging lens. Exceeding the lower limit of the conditional expression range causes the overall length of the imaging lens to be smaller than the distance from the vertex of the image side of the condenser lens group to the vertex of the object side of the imaging lens group. When moving greatly, problems such as vignetting of light beams and illuminance drop occur. If the upper limit of the conditional expression range is exceeded, compactness will be lost.

It is preferable that the relay lens optical system of each embodiment satisfies the following conditional expression range (6). 0.2 <| Drelayβ / fl | <1 ········································································································································· (5)

The above conditional expression range represents the ratio of the focal length of the relay lens optical system to the value obtained by multiplying the total length of the lens by the relay magnification. If the lower limit of the conditional expression range is exceeded, the product of the total length of the imaging lens and the relay magnification becomes smaller with respect to the focal length of the relay lens optical system. Problems such as vignetting and reduced illumination occur. If the upper limit of the conditional expression range is exceeded, compactness will be lost.

It is preferable that the relay lens optical system of each embodiment satisfies the following conditional expression range (6). 0.05 <| Rmaxβ / fl | <1 (6) where Rmax is the maximum effective system of the imaging lens β is the relay magnification.

The conditional expression range (6) expresses the ratio of the focal length of the relay lens optical system to the maximum effective system of the imaging lens multiplied by the relay magnification. When the lower limit of the conditional expression range is exceeded, the maximum effective system of the imaging lens and the relay magnification are multiplied, but the focal length of the relay lens optical system becomes smaller. Occasionally, problems such as vignetting of the light beam and reduced illuminance occur. If the upper limit of the conditional expression range is exceeded, compactness will be lost.

[0050]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a relay lens optical system according to the present invention will be described.
This will be described more specifically with construction data, aberration diagrams, and the like including the photographing lens group. The following Examples 1 to 4 correspond to the above-described first to fourth embodiments, respectively. The lens arrangement diagrams representing the first to fourth embodiments correspond to the corresponding Examples 1 to 4, respectively. No. 4 shows a lens configuration.

In each embodiment, ri (i = 1, 2, 3,...) Is the radius of curvature of the i-th surface counted from the object side, and di (i = 1, 2, 3,...)
Indicates the i-th axial top surface distance counted from the object side, and Ni (i = 1,
2,3 ...) and νi (i = 1,2,3 ...) indicate the refractive index and Abbe number of the i-th lens from the object side with respect to the d-line. In addition,
The letter E added to the numerical data in the embodiment represents the exponent part of the corresponding numerical value. For example, 1.0 × 10E02 indicates 1.0 × 10 ² .

The parallel flat plates in front of the secondary image forming plane are prisms, low-pass filters, and face plates for splitting a light beam. Embodiments of the present invention can use interchangeable lenses for single-lens reflex cameras other than those described in this embodiment.
In addition, a half mirror, a pellicle mirror, or the like can be used as the light beam splitting unit in addition to the prism.

FIGS. 5 to 8 show the first and second embodiments, respectively.
FIG. Each figure shows an optical path, and each optical path diagram shows an optical path passing on-axis light and outermost off-axis light.

In FIG. 5, the front group of the imaging lens is r16 to r2.
2. The rear group is r23-r30. In the imaging lens, the light beam becomes narrowest near r23, and the air lens surrounded by r22 and r23 has the strongest power among the air lenses in the imaging lens.

In FIG. 6, the front group of the imaging lens is r16 to r2.
0, rear group is r21 to r29. In the image forming lens group, the light beam becomes narrowest near r21, and the air lens surrounded by r20 and r21 has the strongest power among the air lenses in the image forming lens.

In FIG. 7, the front group of the imaging lens is r17 to r2.
1, the rear group is r23-r30. In the imaging lens group, the light beam becomes the thinnest near r23, and the air lens surrounded by r21 and r23 has the strongest power among the air lenses in the imaging lens.

In FIG. 8, the front group of the imaging lens is r17 to r2.
1, the rear group is r23-r30. In the imaging lens group, the light beam becomes the thinnest near r23, and the air lens surrounded by r21 and r23 has the strongest power among the air lenses in the imaging lens.

In each embodiment, the best image plane of the photographing lens group (GrS) is a position located 2.35 mm from the vertex on the object side of the condenser lens group (Gr1) toward the object side.

In each of the embodiments, the surface marked with an asterisk (*) indicates the surface constituted by an aspherical surface, and is defined by the following expression representing the surface shape of the aspherical surface.

[0060]

(Equation 1)

X: height in the direction perpendicular to the optical axis, Y: displacement amount from the reference plane in the optical axis direction, C: paraxial curvature, ε: secondary curved surface parameter, Ai: i of the following equation The aspheric coefficient,

<< Example 1 >> Fno = 2.8 [Radius of curvature] [Shaft upper surface interval] [Refractive index] [Abbe number] r1 = 67.535 d1 = 2.700 N1 = 1.74100 ν1 = 52.65 r2 = -232.627 d2 = 0.150 r3 = 15.084 d3 = 3.250 N2 = 1.81554 ν2 = 44.36 r4 = 28.371 d4 = 0.700 r5 = 79.470 d5 = 1.200 N3 = 1.67270 ν3 = 32.10 r6 = 12.601 d6 = 4.057 r7 = ∞ d7 = 3.200 r8 = -14.692 d8 = 2.150 N4 = 1.78472 ν4 = 25.68 r9 = -20.601 d9 = 0.150 r10 = -104.766 d10 = 2.400 N5 = 1.69680 ν5 = 55.53 r11 = -19.982 d11 = 42.916 r12 = ∞ d12 = 4.000 N6 = 1.67000 ν6 = 57.07 r13 = -74.713 d13 = 1.200 r14 = 48.544 d14 = 4.500 N7 = 1.69350 ν7 = 50.29 r15 = ∞ d15 = 80.000 r16 = 32.500 d16 = 3.000 N8 = 1.61720 ν8 = 54.00 r17 = 59.145 d17 = 0.150 r18 = 17.282 d18 = 3.600 N9 = 1.85000 ν9 = 40.04 r19 = 54.944 d19 = 0.120 r20 = 13.200 d20 = 4.000 N10 = 1.85000 ν10 = 40.04 r21 = 44.197 d21 = 0.900 N11 = 1.75000 ν11 = 25.14 r22 = 8.000 d22 = 6.985 r23 = -9.622 d23 = 3.196 N12 = 1.75000 ν12 = 25.14 r24 = 33.405 d24 = 4.200 r25 = -69.312 d25 = 3.600 N13 = 1.80420 ν13 = 46.50 r26 = -24.194 d26 = 0.300 r27 = 85.357 d27 = 5.300 N14 = 1.69350 ν14 = 50.29 r28 = -28.842 d28 = 0.500 r29 = 25.161 d29 = 4.900 N15 = 1.69680 ν15 = 56.47 r30 = -422.477 d30 = 1.000 r31 = ∞ d31 = 18.000 N16 = 1.77551 ν16 = 37.90 r32 = ∞ d32 = 3.610 N17 = 1.54426 ν17 = 69.60 r33 = ∞ d33 = 1.000 N18 = 1.51680 ν18 = 64.20 r34 = ∞ d34 = 1.200 N19 = 1.51680 ν19 = 64.20 r35 = ∞ 《Example 2》 Fno = 2.8 [Radius of curvature] ] [Refractive index] [Abbe number] r1 = 67.535 d1 = 2.700 N1 = 1.74100 ν1 = 52.65 r2 = -232.627 d2 = 0.150 r3 = 15.084 d3 = 3.250 N2 = 1.81554 ν2 = 44.36 r4 = 28.371 d4 = 0.700 r5 = 79.470 d5 = 1.200 N3 = 1.67270 ν3 = 32.10 r6 = 12.601 d6 = 4.057 r7 = ∞ d7 = 3.200 r8 = -14.692 d8 = 2.150 N4 = 1.78472 ν4 = 25.68 r9 = -20.601 d9 = 0.150 r10 = -104.766 d10 = 2.400 N5 = 1.69680 ν5 = 55.53 r11 = -19.982 d11 = 42.916 r12 = ∞ d12 = 4.000 N6 = 1.69680 ν6 = 56.47 r13 = -36.608 d13 = 1.200 r14 = 100.000 d14 = 4.500 N7 = 1.80500 ν7 = 40.97 r15 = ∞ d15 = 80.000 r16 * = -21.421 d16 = 5.500 N8 = 1.64050 ν8 = 60.08 r17 * =-15.028 d17 = 0.120 r18 = 14.143 d18 = 3.700 N9 = 1.80100 ν9 = 46.54 r19 = 2 6.175 d19 = 0.599 N10 = 1.79850 ν10 = 22.60 r20 = 21.290 d20 = 6.156 r21 = -16.941 d21 = 1.772 N11 = 1.76182 ν11 = 26.55 r22 = 20.041 d22 = 4.700 r23 = -38.298 d23 = 3.500 N12 = 1.67000 ν12 = 57.07 r24 = -16.739 d24 = 0.689 r25 = 78.394 d25 = 4.501 N13 = 1.67000 ν13 = 57.07 r26 = -23.456 d26 = 2.845 N14 = 1.72000 ν14 = 54.71 r27 = -20.929 d27 = 0.174 r28 * = 14.861 d28 = 6.000 N15 = 1.67790 ν15 = 53.38 r29 * = 9.803 d29 = 4.500 r30 = ∞ d30 = 19.000 N16 = 1.74400 ν16 = 44.93 r31 = ∞ d31 = 4.000 N17 = 1.54426 ν17 = 69.60 r32 = ∞ d32 = 2.000 N18 = 1.51680 ν18 = 64.20 r33 = ∞ Aspherical data of (r16)] ε = 1.00000 A4 = 0.39429E-04 A6 = -0.95980E-07 A8 = -0.73458E-09 [Aspherical data of 17th surface (r17)] ε = 1.00000 A4 = 0.52818E -04 A6 = -0.16900E-07 A8 = -0.43349E-09 [Aspheric data of the 28th surface (r28)] ε = 1.00000 A4 = 0.85599E-05 A6 = -0.30859E-07 A8 = 0.13771E-09 [Aspherical surface data of the 29th surface (r29)] ε = 1.00000 A4 = -0.22588E-04 A6 = 0.58537E-07 A8 = -0.24623E-09 << Example 3 >> Fno = 2.8 [Radius of curvature] [Top surface of shaft] [Interval] [Refractive index] [A Number) r1 = 67.535 d1 = 2.700 N1 = 1.74100 ν1 = 52.65 r2 = -232.627 d2 = 0.150 r3 = 15.084 d3 = 3.250 N2 = 1.81554 ν2 = 44.36 r4 = 28.371 d4 = 0.700 r5 = 79.470 d5 = 1.200 N3 = 1.67270 ν3 = 32.10 r6 = 12.601 d6 = 4.057 r7 = ∞ d7 = 3.200 r8 = -14.692 d8 = 2.150 N4 = 1.78472 ν4 = 25.68 r9 = -20.601 d9 = 0.150 r10 = -104.766 d10 = 2.400 N5 = 1.69680 ν5 = 55.53 r11 =- 19.982 d11 = 40.570 r12 = ∞ d12 = 2.350 r13 = ∞ d13 = 4.000 N6 = 1.69680 ν6 = 56.47 r14 = -75.992 d14 = 1.200 r15 = 55.556 d15 = 4.500 N7 = 1.80500 ν7 = 40.97 r16 = ∞ d16 = 80.000 r17 * = 21.647 d17 = 5.500 N8 = 1.81100 ν8 = 44.86 r18 = -1298.819 d18 = 0.120 r19 = 10.086 d19 = 3.700 N9 = 1.81100 ν9 = 44.86 r20 = 14.044 d20 = 0.949 N10 = 1.79850 ν10 = 22.60 r21 = 7.040 d21 = 4.050 r22 = d22 = 1.890 r23 = -16.527 d23 = 1.965 N11 = 1.76182 ν11 = 26.55 r24 = 19.096 d24 = 4.500 r25 = -64.357 d25 = 3.500 N12 = 1.67000 ν12 = 57.07 r26 = -19.896 d26 = 0.503 r27 = 50.243 d27 = 5.816 N13 = 1.67000 ν13 = 57.07 r28 = -44.214 d28 = 0.500 r29 = 26.17 d29 = 6.000 N14 = 1.67000 ν14 = 57.07 r30 * =-209.057 d30 = 1.0 00 r31 = ∞ d31 = 19.000 N15 = 1.74400 ν15 = 44.93 r32 = ∞ d32 = 4.000 N16 = 1.54426 ν16 = 69.60 r33 = ∞ d33 = 2.000 N17 = 1.51680 ν17 = 64.20 r34 = ∞ (The 17th surface (r17) aspheric surface Data] ε = 1.00000 A4 = -0.40082E-05 A6 = -0.92820E-08 A8 = 0.39019E-11 [Aspheric data of the 30th surface (r30)] ε = 1.00000 A4 = -0.25721E-04 A6 = 0.10290 E-06 A8 = -0.25625E-09 << Example 4 >> Fno = 2.7 [Radius of curvature] [Spacing of the upper surface of the shaft] [Refractive index] [Abbe number] r1 = 67.535 d1 = 2.700 N1 = 1.74100 ν1 = 52.65 r2 =- 232.627 d2 = 0.150 r3 = 15.084 d3 = 3.250 N2 = 1.81554 ν2 = 44.36 r4 = 28.371 d4 = 0.700 r5 = 79.470 d5 = 1.200 N3 = 1.67270 ν3 = 32.10 r6 = 12.601 d6 = 4.057 r7 = ∞ d7 = 3.200 r8 = -14.692 d8 = 2.150 N4 = 1.78472 ν4 = 25.68 r9 = -20.601 d9 = 0.150 r10 = -104.766 d10 = 2.400 N5 = 1.69680 ν5 = 55.53 r11 = -19.982 d11 = 40.570 r12 = ∞ d12 = 2.350 r13 = ∞ d13 = 4.000 N6 = 1.69680 ν6 = 56.47 r14 = -50.819 d14 = 1.200 r15 = 74.074 d15 = 4.500 N7 = 1.80500 ν7 = 40.97 r16 = ∞ d16 = 80.000 r17 * = 32.078 d17 = 5.500 N8 = 1.80100 ν8 = 46.54 r18 * =-86.358 d18 = 0.12 0 r19 = 13.386 d19 = 3.700 N9 = 1.81100 ν9 = 44.86 r20 = 30.557 d20 = 0.917 N10 = 1.79859 ν10 = 22.60 r21 = 11.557 d21 = 3.050 r22 = ∞ d22 = 2.950 r23 = -11.960 d23 = 1.875 N11 = 1.76182 ν11 = 26.55 r24 = 38.729 d24 = 4.500 r25 = -23.073 d25 = 3.900 N12 = 1.67000 ν12 = 57.07 r26 = -13.848 d26 = 0.509 r27 = -85.002 d27 = 5.845 N13 = 1.67830 ν13 = 48.97 r28 = -21.617 d28 = 0.500 r29 * = 25.313 d29 = 5.600 N14 = 1.67790 ν14 = 53.38 r30 * = 79.223 d30 = 2.000 r31 = ∞ d31 = 19.000 N15 = 1.74400 ν15 = 44.93 r32 = ∞ d32 = 4.000 N16 = 1.54426 ν16 = 69.60 r33 = ∞ d33 = 2.000 N17 = 1.51680 ν17 = 64.20 r34 = ∞ [Aspherical surface data of 17th surface (r17)] ε = 1.00000 A4 = 0.24014E-04 A6 = 0.25807E-07 A8 = -0.47768E-11 [Aspherical surface data of 18th surface (r18)] ] ε = 1.00000 A4 = 0.27284E-04 A6 = -0.25600E-07 A8 = -0.78520E-10 [Aspheric surface data of the 29th surface (r29)] ε = 1.00000 A4 = -0.14964E-04 A6 = -0.56017 E-08 A8 = 0.16439E-09 [Aspherical surface data of surface 30 (r30)] ε = 1.0000 A4 = −0.24514E-04 A6 = 0.61671E −07 A8 = −0.70013E−10 FIGS. 9 to 12 are aberration diagrams corresponding to Examples 1 to 4, respectively. Each diagram shows aberration, and each aberration diagram corresponds to spherical aberration, astigmatism, and distortion in order from the left. In the spherical aberration diagram, the solid line (d) represents the d-line, the broken line (c) represents the c-line, and the dashed line (g) represents the spherical aberration with respect to the g-line. The solid line (Y) and the solid line (X) represent astigmatism on the meridional surface and the sagittal surface, respectively.

The first to fourth embodiments satisfy the conditional expressions (1) to (6). The following table shows values corresponding to the conditional expressions (1) to (6) in Examples 1 to 4.

[0064]

[Table 1]

[0065]

As described above, according to the present invention, various kinds of interchangeable lenses can be used, and the distance from the vertex of the condenser lens group most image side to the vertex of the imaging lens group most object side is long. It is possible to provide a small, high-performance relay lens optical system having an increased degree of freedom in performing the operation.

[Brief description of the drawings]

FIG. 1 is a lens configuration diagram of a first embodiment.

FIG. 2 is a lens configuration diagram of a second embodiment.

FIG. 3 is a lens configuration diagram of a third embodiment.

FIG. 4 is a lens configuration diagram of a fourth embodiment.

FIG. 5 is an optical path diagram of the first embodiment.

FIG. 6 is an optical path diagram according to a second embodiment.

FIG. 7 is an optical path diagram of a third embodiment.

FIG. 8 is an optical path diagram of a fourth embodiment.

FIG. 9 is an aberration diagram of the first embodiment.

FIG. 10 is an aberrational diagram of the second embodiment.

FIG. 11 is an aberration diagram of the third embodiment.

FIG. 12 is an aberrational diagram of the fourth embodiment.

FIG. 13 is an explanatory diagram of a photographing lens group and a relay lens optical system.

FIG. 14 is a perspective view of a photographing lens group and a relay lens optical system.

[Explanation of symbols]

 GrS ・ ・ ・ Shooting lens group Gr1 ・ ・ ・ Condenser lens group Gr2 ・ ・ ・ Imaging lens group

Claims (3)

[Claims] 1. A relay lens optical system for re-imaging a primary image as a secondary image, comprising: a condenser lens group having a positive power and an imaging having a positive power in order from the primary image surface side. 0.9 <| Dcr · β / fl |, where Dcr is the lens group of the condenser lens group and the imaging lens group from the vertex of the most image side surface of the condenser lens group, and satisfies the following condition: Distance to the vertex of the side of the object, β: relay magnification, fl: focal length of the whole system. 2. A relay lens optical system for re-imaging a primary image as a secondary image, comprising a condenser lens group having a positive power and an imaging having a positive power in order from the primary image surface side. 0.7 <| flr / flc | where, flr: focal length of the imaging lens group, flc: focal length of the condenser lens group, comprising: a lens group and satisfying the following conditions: It is. 3. The imaging lens group according to claim 1, wherein the imaging lens group includes a front group and a rear group in order from the primary image surface side, and satisfies the following conditions. Relay lens optical system; 1.1 <| flr / flrf | where, flr: focal length of the imaging lens group flrf: focal length of the front group of the imaging lens group