WO-2026094604-A1 - IMAGING OPTICAL SYSTEM AND IMAGING DEVICE

Abstract

In these imaging optical system and imaging device, the imaging optical system forms, for each lens pair comprising a first lens and a second lens facing each other of a first lens array and a second lans array, a partial image comprising a light flux from a part of a subject on an imaging surface, and forms a whole image of the subject on the imaging surface by combining partial images formed on the imaging surface by a plurality of lens pairs of the first lens array and the second lens array. In the imaging optical system, halfway between the two lens arrays in an optical axis direction, an optical element is provided at a distance S1 from each of the two lens arrays and at a position where an intermediate image is formed by a first lens adjacent to a first lens facing at least the part of the subject, and the intermediate image is formed on the imaging surface by a second lens facing the adjacent first lens and superimposed on a partial image formed by a lens pair including the first lens facing the part of the subject.

Inventors

• YAMAGUCHI, MASAHIRO
• NAKAO, ISAMU
• NAKAJIMA, SHINYA

Assignees

• アークレイ株式会社

Dates

Publication Date

20260507

Application Date

20251010

Priority Date

20241031

Claims (5)

1. A first lens array is composed of multiple first lenses having the same focal length fa and optical performance, arranged on a two-dimensional plane, A plurality of second lenses having the same optical performance as the first lens are arranged in the same manner as the first lens array, and the optical axis of each of the plurality of second lenses is aligned with the optical axis of each of the plurality of first lenses, and the second lens array is positioned at a distance of 2S1 on the optical axis from the first lens array, Equipped with, In an imaging optical system, for each pair of lenses consisting of the first lens and the second lens facing each other in the first and second lens arrays, a partial image consisting of a light beam from a part of the subject is formed on the imaging surface, and the partial images formed on the imaging surface by multiple pairs of lenses in the first and second lens arrays are combined to form a whole image of the subject on the imaging surface, Furthermore, an optical element is provided at a position midway between the first lens array and the second lens array in the optical axis direction, at a distance S1 from the first lens array and the second lens array, respectively, and at a position where an intermediate image is formed by a first lens adjacent to at least a part of the subject facing the first lens. An imaging optical system characterized by forming an image of the intermediate image on the imaging surface using a second lens facing the adjacent first lens, and superimposing it onto a partial image formed by a lens pair including the first lens facing a part of the subject.
2. The optical element is a third lens array in which a plurality of third lenses are arranged in the same manner as the first lens array, and the optical axis of each of the plurality of third lenses is aligned with the optical axis of each of the plurality of first lenses. The focal lengths of the first lens and the second lens are fa, The focal length of the third lens is fb, If the distance from the first lens to the intermediate image is S1, fa<S1<2fa...(1) fb=(1/2)×S1...(2) The imaging optical system according to claim 1, satisfying the conditional expression (1) represented by .
3. The imaging optical system according to claim 1, wherein the optical element is a two-plane orthogonal reflector array.
4. The imaging optical system according to claim 1, wherein the optical element is a diffuser plate.
5. An imaging optical system according to any one of claims 1 to 4, An imaging device comprising an image sensor.

Description

Imaging optical system and imaging device This disclosure relates to an imaging optical system and an imaging apparatus. Japanese Patent No. 6462837 describes an observation method using a microscopic imaging device that allows for easy observation of the object being observed. Japanese Patent Publication No. 2020-008667 describes a microscopic observation device that allows for easy observation of the entire object by utilizing fluorescence from the object irradiated with excitation light. This is a schematic diagram of the imaging optical system of the first embodiment.This is a diagram illustrating the operation of the imaging optical system of the first embodiment.This is a schematic diagram of the imaging optical system of the second embodiment.This is a diagram illustrating the operation of the imaging optical system in the second embodiment.This is a schematic diagram of the imaging optical system according to the third embodiment.This is a diagram illustrating the operation of the imaging optical system of the third embodiment.This is an external view of the imaging device according to the fourth embodiment.This is a schematic diagram of the imaging device according to the fourth embodiment. [First Embodiment] The imaging optical system of the first embodiment of this disclosure will be described below with reference to the drawings. Figure 1 is a schematic diagram of the imaging optical system 1 of the first embodiment. In Figure 1, the left side is the object side and the right side is the image side. Also in Figure 1, the optical axis Z and the image plane I of the imaging optical system 1 are shown together. As shown in Figure 1, the imaging optical system 1 comprises a first microlens array 10, a second microlens array 20, and a third microlens array 30. The third microlens array 30 corresponds to an optical element in the technology of this disclosure. The first microlens array 10 is constructed by arranging multiple first microlenses 11, each having the same focal length fa and optical performance, on a two-dimensional plane. The second microlens array 20 is constructed by arranging multiple second microlenses 21, which have the same optical performance as the first microlens 11, in the same manner as the first microlens array 10. Furthermore, the second microlens array 20 is positioned at a distance of 2S1 along the optical axis from the first microlens array 10, with the optical axes of each of the multiple second microlenses 21 aligned with the optical axes Z of each of the multiple first microlenses 11. In the imaging optical system 1, for each pair of lenses consisting of the opposing first microlens 11 and second microlens 21 of the first microlens array 10 and the second microlens array 20, a partial image Ip consisting of light beam from a part of the subject is formed on the imaging surface Sim. The partial images Ip formed on the imaging surface Sim by multiple lens pairs of the first microlens array 10 and the second microlens array 20 are then combined to form a complete image Iw of the subject on the imaging surface Sim. The third microlens array 30 is positioned midway along the optical axis Z direction between the first microlens array 10 and the second microlens array 20, at a distance S1 from each of the first and second microlens arrays 20, and is positioned where an intermediate image is formed by the first microlens 11 adjacent to at least one of the first microlenses 11 that faces a portion of the subject. Furthermore, the third microlens array 30 is configured with multiple third microlenses 31 arranged in the same manner as the first lens array 10, and the optical axis Z of each of the multiple third microlenses 31 is aligned with the optical axis Z of each of the multiple first microlenses 11. Here, the third microlens 31 is configured to satisfy the following conditions (1) and (2). fa<S1<2fa...(1) fb=(1/2)×S1...(2) In conditional equations (1) and (2), fa: focal lengths of the first microlens 11 and the second microlens 21; fb: focal length of the third microlens 31; S1: distance from the first microlens 11 to the intermediate image, or distance from the intermediate image to the second microlens 21. Furthermore, as shown in Figure 2, the third microlens array 30 is configured to superimpose an intermediate image Ipmb formed by the first microlens 11b adjacent to the first microlens 11a facing a portion of the subject Opa onto the partial image Ipa1 formed by the lens pair including the first microlens 11a facing the portion of the subject Opa, by imaging the intermediate image Ipmb formed by the second microlens 21 facing the adjacent first microlens 11b. Here, we will explain in detail the contents of conditions (1) and (2). Assuming that each first microlens 11 in the first microlens array 10 is a thin lens with negligible thickness, the imaging relationship is given by equation (3) and the image magnification relationship is given by equation (4). (1/S0)+(1/S1)=1