CN114527077A - light measuring device - Google Patents

Abstract

A light measurement device for measuring light from an observation target, comprising: an imaging lens that transmits the light to form a primary image; a dispersing lens array which is disposed downstream of the imaging lens in a light traveling direction and is formed by disposing a plurality of dispersing lenses in an array form, and which converts the primary image into a secondary image composed of a plurality of discrete spots by dispersing the light on which the primary image is formed into a plurality of spots after passing through each of the dispersing lenses; and a light receiving element array which is arranged on the downstream side of the discrete lens array in the light traveling direction and in which a plurality of light receiving elements are arranged in an array corresponding to the discrete lens array, wherein each of the discrete light spots is received by a light receiving section of each of the light receiving elements.

Description

light measuring device

technical field

The present invention relates to a light measuring device for measuring light.

Background technique

Conventionally, there are optical measurement devices that measure light from an observation object. These include high-sensitivity cameras. However, the price of such a high-sensitivity camera increases according to the increase in sensitivity, and there is a problem that the cost increases.

In order to keep costs down, it has been proposed to employ a light-receiving element that can realize high sensitivity at a low price, and that the light-receiving element is composed of a photodiode, a photomultiplier tube, and the like. However, when one light-receiving element is used, there is a problem in that it is impossible to measure light having a two-dimensional distribution.

In order to measure two-dimensionally distributed light, there has been proposed a two-dimensional distribution of a plurality of light-receiving elements. However, since the light-receiving elements include wirings and the like, there is a gap between the light-receiving portions of the respective light-receiving elements. Therefore, the size of the light-receiving portion is small compared to the light-receiving element, that is, the ratio of the area of the light-receiving portion to the light-receiving element (effective aperture ratio) is small. Therefore, no matter how the light-receiving elements are arranged, the problem that light is irradiated to regions other than the light-receiving portion cannot be avoided, and there is a problem that the light-receiving efficiency is low.

In order to improve the light-receiving efficiency, a device in which light-receiving parts are arranged without gaps has been proposed, but such a device has a problem of being expensive like the aforementioned high-sensitivity camera.

SUMMARY OF THE INVENTION

The present invention has been made in view of the above-mentioned background, and its main object is to provide a light measuring device capable of realizing high light-receiving efficiency at low cost.

A first aspect of the present invention is a light measuring device for measuring light from an observation object, characterized by comprising: an imaging lens that transmits the light to form a primary image; It is arranged on the downstream side of the imaging lens in the direction, and is formed by arranging a plurality of discrete lenses in an array, and the discrete lens array allows the light forming the primary image to pass through each of the discrete lenses and then discrete into a plurality of light spots. , so that the above-mentioned primary image is converted into a secondary image composed of the above-mentioned discrete plurality of light spots; and a light-receiving element array is arranged on the downstream side of the above-mentioned discrete lens array in the light traveling direction, so as to be consistent with the above-mentioned discrete lens array A plurality of light-receiving elements are arranged in a corresponding array, and each of the discrete light spots is received by a light-receiving portion included in each of the light-receiving elements.

According to claim 1, the light is dispersed into a plurality of light spots after passing through the separation lens array, and each of the dispersed light spots is received by the light-receiving portion of each light-receiving element of the light-receiving element array. Therefore, even if it is an inexpensive light-receiving element with a low effective aperture ratio, which is the ratio of the area of the light-receiving part to the light-receiving element, light is irradiated to the light-receiving part of the light-receiving element, so that it is possible to reduce the amount of light irradiated on the light-receiving element other than the light-receiving part. area of light. Therefore, it is possible to realize a light measuring device with high light receiving efficiency at low cost.

In addition, in claim 2, each of the above-mentioned discrete lenses is arranged without a gap therebetween.

As a result, the light from the observation object does not pass through the gaps between the separation lenses, so that all the light from the observation object can pass through the separation lens without omission and be dispersed into a plurality of spots, which can further improve the Light receiving efficiency.

In addition, in claim 3, each of the discrete lenses is configured such that the size of each of the light spots irradiated on the each of the light-receiving elements is equal to or smaller than the size of the light-receiving portion of each of the light-receiving elements.

Thereby, it is possible to prevent light from being irradiated to a region other than the light-receiving portion on the light-receiving element, whereby the light-receiving efficiency can be further improved.

Moreover, in Claim 4, each said light-receiving part is distributed and arrange|positioned independently of each other.

In addition, in claim 5, the pitch between the centers of the light-receiving portions is the same as the pitch between the centers of the light spots irradiated on the light-receiving elements.

Thereby, it is possible to make all discrete light spots be received by each light-receiving part without omission.

Moreover, in Claim 6, the said lens array for discretes is arrange|positioned in the position which forms the said primary image.

Moreover, in Claim 7, the said lens array for dispersion|distribution and the said light-receiving element array are arrange|positioned with a distance spaced apart in the advancing direction of light.

Moreover, in Claim 8, the said light-receiving element array is arrange|positioned in the position which forms the said secondary image.

In addition, in claim 9, in a certain direction on the plane where the discrete lens array is located, the distance between the centers of the discrete lenses is the same, and in a certain direction on the plane where the light-receiving element array is located , the pitches between the centers of the light-receiving portions of the light-receiving elements are the same.

In addition, in claim 10, the light-receiving element includes a photodiode, a tube dependent resistor, a photomultiplier tube, and the like.

Description of drawings

FIG. 1 is a schematic diagram showing the entirety of an optical measurement device according to an embodiment of the present invention.

2 is a schematic diagram showing the formation of a primary image on the lens array for discrete and the formation of a secondary image on the light-receiving element array.

FIG. 3 is a schematic diagram showing a lens array for discrete.

FIG. 4 is a schematic diagram showing an array of light-receiving elements.

FIG. 5 is a schematic diagram showing a block representation of an observation object.

FIG. 6 is a schematic diagram showing a block representation of a primary image formed on a lens array for dispersion.

FIG. 7 is a schematic diagram showing a block representation of a secondary image formed on a light-receiving element array.

Detailed ways

Hereinafter, the optical measuring device of the present invention will be described in detail with reference to the accompanying drawings.

The optical measurement device 100 according to the embodiment of the present invention will be described based on the drawings. FIG. 1 is a schematic diagram showing the entirety of an optical measurement device according to an embodiment of the present invention. 2 is a schematic diagram showing the formation of a primary image on the lens array for discrete and the formation of a secondary image on the light-receiving element array. FIG. 3 is a schematic diagram showing a lens array for discrete use, wherein FIG. 3( a ) is a front view seen from the light traveling direction, FIG. 3( b ) is a plan view seen from above, and FIG. 3( c ) is a Side view from the side. FIG. 4 is a schematic diagram showing an array of light-receiving elements.

The light measuring apparatus 100 is an apparatus that measures light from the observation object A (see FIG. 1 ). The observation object A may be, for example, cells or the like collected from the human body, but is not limited thereto. As shown in FIG. 1 , the optical measurement device 100 includes an imaging lens 10 , a lens array 20 for dispersion, and an array 30 of light receiving elements.

As shown in FIG. 2 , in this embodiment, an F-shaped observation object A is described as an example, but the observation object is not limited to this. As shown in FIGS. 1 and 2 , the imaging lens 10 transmits light from an F-shaped observation object A to form a primary image at the position of the discrete lens array 20 , that is, the discrete lens array 20 is arranged to form a primary image. image location. The primary image is an inverted F-shaped image in which the F-shaped observation object A is inverted in the vertical direction and the left-right direction. In FIG. 2 , illustration of the discrete lens array 20 is omitted. The imaging lens 10 is, for example, a condenser lens that transmits and condenses the light from the observation object A, and a commercially available common imaging lens can be used. The light from the observation object A may be, for example, any one of reflected light, fluorescence, phosphorescence, etc., but is not limited thereto.

As shown in FIG. 1 , the discrete lens array 20 is arranged on the downstream side of the imaging lens 10 in the traveling direction of light.

As shown in FIG. 3 , the lens array 20 for dispersion is formed by arranging a plurality of lenses 201 for dispersion in an array. In this embodiment, a 4×5 array is taken as an example for description, but it is not limited thereto. As shown in FIG. 1 , the discrete lens array 20 allows the light having formed a primary image to pass through each discrete lens 201 and then discrete into a plurality of light spots, thereby converting the primary image into a plurality of discrete light spots as shown in FIG. 2 . The secondary image of the inverted F shape.

Each discrete lens 201 on the discrete lens array 20 is not particularly limited as long as it can transmit light through the discrete lens array and then discrete into a plurality of spots. For example, a condenser lens for condensing light can be used.

In the present embodiment, the distance between the centers of the discrete lenses 201 is the same in any direction on the plane where the discrete lens array 20 is located, for example, the left-right direction or the vertical direction in FIG. 3( a ). However, the present invention is not limited to this, and the distances between the centers of the discrete lenses 201 may be different.

As shown in FIG. 1 , the light-receiving element array 30 is arranged at a position on the downstream side of the discrete lens array 20 where the secondary image is formed in the traveling direction of light.

As shown in FIG. 4 , the light-receiving element array 30 is formed by arranging a plurality of light-receiving elements 301 in a 4×5 array (4 columns and 5 rows), which is an array corresponding to the lens array 20 for dispersion. The light-receiving element 301 is an element capable of converting an optical signal into an electrical signal. In this embodiment, a photodiode is described as the light-receiving element 301 , but the light-receiving element 301 is not limited to this. Each light-receiving element 301 has a light-receiving portion 302, and the light-receiving portion 302 is indicated by a gray area in FIG. 4 . The discrete light spots formed by the light passing through the discrete lens array 20 are respectively received by the light receiving units 301 included in the respective light receiving elements 30 , and converted into electrical signals by the light receiving units 301 for analysis.

As shown in FIG. 4 , there is a gap for wiring or the like between the respective light-receiving portions 302 , that is, the light-receiving portions 302 are distributed and arranged independently of each other.

In the present embodiment, in any direction on the plane where the light receiving element array 30 is located, for example, the left-right direction or the up-down direction in FIG. However, the present invention is not limited to this, and the distances between the centers of the respective light-receiving portions 302 may be different.

Preferably, if the focal length of the imaging lens 10 is f1 and the distance between the observation object A and the imaging lens 10 is L1, the distance L2 between the imaging lens 10 and the discrete lens array 20 satisfies the following relationship.

1/L1+1/L2=1/f1...Formula 1

When Equation 1 is satisfied, as shown in FIG. 2 , a primary image is formed on the lens array 20 for separation, and a secondary image is formed at the focal length f2 of each lens 201 for separation. Therefore, it is preferable that the dispersion lens array 20 and the light-receiving element array 30 are arranged at a distance in the traveling direction of the light, and it is more preferable that the light-receiving element array 30 is arranged at each distance from the dispersion lens array 20 . At the position of the focal length f2 of the discrete lens 301 . In FIG. 2 , illustration of the discrete lens array 20 and the light-receiving element array 30 is omitted. Since the secondary image is composed of a plurality of discrete light spots, the respective light-receiving parts 302 that receive the respective light spots may be distributed and arranged independently of each other.

Next, the process of forming the primary image and the secondary image will be described with reference to FIGS. 5 to 7 . FIG. 5 is a schematic diagram showing a block representation of an observation object. FIG. 6 is a schematic diagram showing a block representation of a primary image formed on a lens array for dispersion. FIG. 7 is a schematic diagram showing a block representation of a secondary image formed on a light-receiving element array.

As shown in FIG. 5 , an observation object A having a two-dimensional distribution is taken as an example for description. The observation object A is divided into a×b regions, in this embodiment, into regions corresponding to a 4×5 array of the discrete lens array 20 , that is, a=4, b=5. Let the distance between the centers of the regions in the left-right direction in FIG. 5 (for example, the uppermost regions 11, 12, . The distance between the centers of 21, . . . b1) is set to L5.

The discrete lens array 20 is arranged at a position away from the imaging lens 10 by a distance L2 that satisfies the aforementioned formula 1, and at this time, a primary image is formed on the discrete lens array 20 . As shown in FIG. 6 , the primary image is divided into regions a×b in accordance with the array of the lens array 20 for discretization. Since the lens array 20 for discretization is a 4×5 array, the primary image is divided into areas divided into a×b, that is, a=4, b=5. In addition, in fact, as described above, the primary image is an image in which the observation object A is inverted in the up-down direction and the left-right direction. However, for ease of understanding, the inversion in the up-down direction and the left-right direction is omitted for description.

As shown in FIG. 6 , according to the positional relationship among the observation object A, the imaging lens 10 , and the discrete lens array 20 , a primary image obtained by multiplying the size of the observation object A by a certain magnification M is obtained. The distance between the centers of each area in the left-right direction of the primary image divided in FIG. 6 (for example, the uppermost areas 11 , 12 , . . . , 1 a ) is L4×M, The distance between the centers of the regions 11, 21, . . . b1) on the left is L5×M.

In this case, the light in each region of the primary image is dispersed after passing through the dispersion lenses 201, and as shown in FIG. 7, discrete light spots 11, 12, ..., 1a, ..., ab, etc., constitute secondary images by these discrete light spots. Thereby, the primary image is converted into a secondary image composed of a plurality of discrete light spots.

If the light-receiving parts 302 of the light-receiving elements 301 are arranged at the same pitch as the pitch between the centers of the light spots at the focal length f2 of the discretization lens 201 , all the discrete light spots can be received by the light-receiving parts 302 without omission. . The size (or diameter) of each spot varies depending on the relationship between the focal length f1 of the imaging lens 10 and the focal length f2 of the discretization lens 201 , the aperture, and the like. Preferably, the focal lengths of the discrete lenses 201 and the imaging lens 10 are adjusted so that the size of each light spot irradiated on each light receiving element 301 is equal to or smaller than the size of the light receiving portion 302 included in each light receiving element 301 .

According to the optical measurement device 100 of the present embodiment, light is dispersed into a plurality of light spots after passing through the separation lens array 20 , and each of the dispersed light spots is received by the light receiving portion 302 of each light receiving element 301 of the light receiving element array 30 . Therefore, even in an inexpensive light-receiving element with a low effective aperture ratio, which is the ratio of the area of the light-receiving part 302 to the light-receiving element 301 , light is irradiated to the light-receiving part 302 of the light-receiving element 301 , and the amount of light irradiated on the light-receiving element 301 can be reduced. The light of the area other than the light-receiving part 302 . Therefore, it is possible to realize a light measuring device with high light receiving efficiency at low cost.

Furthermore, it is preferable that the respective lenses 201 for discrete are arranged without a gap therebetween. As a result, the light from the observation object A does not pass through the gaps between the separation lenses 201, so that the light from the observation object A can pass through the separation lens 201 without any omission and be dispersed into a plurality of spots , the light-receiving efficiency can be further improved.

Further, in the present invention, each discrete lens 201 is configured such that the size of each light spot irradiated on each light receiving element 301 is equal to or smaller than the size of the light receiving portion 302 included in each light receiving element 301 .

Thereby, it is possible to prevent light from being irradiated to a region other than the light-receiving portion 302 on the light-receiving element 301, whereby the light-receiving efficiency can be further improved.

In addition, in the present invention, the pitch between the centers of the light-receiving portions 302 of the respective light-receiving elements 301 is the same as the pitch between the centers of the respective light spots irradiated on the respective light-receiving elements 301 . Therefore, all discrete light spots can be received by each light receiving unit 302 without omission.

[Variation]

In the above-described embodiment, the lens array 20 for dispersion is a 4×5 array of multiple columns and multiple rows. However, in a modification, the discrete lens array 20 may be a one-dimensional array of a single column or a single row, or a non-matrix array arranged radially centered on a certain point.

In addition, in the above-mentioned embodiment, the photodiode has been described as the light-receiving element 301 . However, as long as the light receiving element 301 is an element capable of converting an optical signal into an electrical signal, for example, a photodiode, a tube varistor, a photomultiplier tube, or the like may be arranged.

The embodiments and modifications of the present invention have been described above with reference to the drawings. However, the above descriptions are only specific examples of the present invention, which are used to understand the present invention, and are not used to limit the scope of the present invention. Those skilled in the art can perform various modifications and combinations of the embodiments based on the technical idea of the present invention, and the resulting modes are also included in the scope of the present invention.

Claims (10)

1. A light measurement device for measuring light from an observation target, comprising:

an imaging lens for transmitting the light to form a primary image;

a dispersing lens array which is disposed downstream of the imaging lens in a light traveling direction and is formed by disposing a plurality of dispersing lenses in an array form, and which converts the primary image into a secondary image composed of a plurality of discrete spots by dispersing the light on which the primary image is formed into a plurality of spots after passing through each of the dispersing lenses; and

and a light receiving element array which is arranged downstream of the discrete lens array in a light traveling direction and in which a plurality of light receiving elements are arranged in an array corresponding to the discrete lens array, wherein each of the discrete light spots is received by a light receiving section of each of the light receiving elements.

2. A light measuring device according to claim 1,

the discrete lenses are arranged without a gap therebetween.

3. A light measuring device as defined in claim 2,

each of the discrete lenses is configured such that the size of each of the light spots irradiated to each of the light receiving elements is equal to or smaller than the size of the light receiving unit included in each of the light receiving elements.

4. A light measuring device according to claim 3,

the light receiving parts are arranged separately and independently of each other.

5. A light measuring device according to claim 4,

the pitch between the centers of the light receiving portions is the same as the pitch between the centers of the light spots irradiated to the light receiving elements.

6. A light measuring device according to claim 5,

the discrete lens array is arranged at a position where the primary image is formed.

7. A light measuring device according to claim 6,

the discrete lens array and the light receiving element array are arranged with a distance therebetween in a light traveling direction.

8. A light measuring device according to claim 7,

the light receiving element array is arranged at a position where the secondary image is formed.

9. A light measuring device according to claim 6,

the pitches between the centers of the discrete lenses are the same in a certain direction on the plane of the discrete lens array,

the light receiving elements have the same pitch between the centers of the light receiving parts in a certain direction on the plane where the light receiving element array is located.

10. A light measuring device according to any one of claims 1 to 9,

the light receiving element includes a photodiode, a thermistor, and a photomultiplier tube.

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