JP5905514B2 - Imaging device, mounting component imaging device - Google Patents

Description

  The present invention relates to an imaging device and a mounted component imaging device.

  2. Description of the Related Art An imaging device that images an electronic component when the electronic component is mounted on a circuit board is known. For example, in order to photograph two or more different imaging ranges (imaging areas), an imaging device that provides reflection mirrors with different angles on the object side of the lens and images light from the imaging range (imaging area) on the imaging element Is known (see, for example, Patent Document 1). The imaging device described in Patent Document 1 generally has a non-telecentric optical system, and images light from two or more imaging ranges on an imaging element via the non-telecentric optical system. For example, light from two imaging areas serving as object surfaces is incident on a lens group serving as a non-telecentric optical system, and is imaged in different areas on the imaging surface (imaging surface) of the image sensor.

JP-A-10-68614

  In the imaging apparatus employing the above-described non-telecentric optical system, when the distance between the reflecting mirror provided on the object side and the lens is not sufficient, for example, an area in which the amount of light is lost by the reflecting mirror occurs in the imaging areas A1 and A2. There may be a region DA in which an optimum image cannot be obtained between two images (images of areas PA1 and PA2) formed on the imaging surface (imaging surface) of the imaging device (imaging unit B21) ( FIG. 4 (a) and FIG. 4 (b)).

  Further, in the imaging apparatus described in Patent Document 1, in order to eliminate the loss of light amount due to the reflection mirror, the distance between the total reflection mirror (side reflection mirror) disposed near the object and the imaging lens unit is increased. Therefore, the imaging apparatus becomes large. When this distance is short, the loss of light quantity becomes relatively large and the effective image on the imaging surface becomes small. Therefore, the image taken out from the imaging element has a low resolution and low recognition accuracy. For example, to compensate for this, an image sensor with a high number of pixels is required, but the image pickup apparatus becomes expensive.

  In addition, when the optical distances between the plurality of imaging areas (imaging areas) and the imaging lens unit are different, it may be impossible to obtain a clear image for each imaging area.

  This invention makes it an example of a subject to cope with such a problem. That is, to provide an imaging device capable of obtaining a clear image by dividing the light from each of the two imaging areas into two areas on the imaging surface of one imaging unit with a simple configuration, It is an object of the present invention to provide an image pickup apparatus, a mounting component image pickup apparatus including the image pickup apparatus, and the like.

In order to achieve such an object, an imaging apparatus according to the present invention includes at least the following configuration.
An imaging device that forms an image of light from a first imaging area and a second imaging area on a single imaging unit,
A first reflective optical element that reflects light from the second imaging area;
The light from the first imaging area is imaged on the first area on the imaging surface of the imaging unit, and the light from the second imaging area reflected by the first reflective optical element is An object-side telecentric optical system that forms an image on a second area on the imaging surface of the imaging unit, wherein the first reflective optical element is located on the imaging surface of the imaging unit from the first imaging area. thereby shielding the optical path to the second area, is configured to image the light only to the first area on the imaging surface of the imaging unit from the first imaging area, the second imaging Light from an area is reflected and incident on the object-side telecentric optical system via the first reflective optical element, and reaches the imaging unit from the second imaging area via the object-side telecentric optical system. The optical path length, A second reflective optical element movably disposed so as to coincide with an optical path length from the first imaging area to the imaging unit via the object-side telecentric optical system, and from the second imaging area A reflection optical element is disposed so that an optical path to the object side telecentric optical system intersects an optical path from the first imaging area to the object side telecentric optical system .

  The mounted component imaging apparatus of the present invention includes the imaging apparatus of the present invention.

  According to the present invention, there is provided an imaging apparatus capable of obtaining a clear image by dividing the light from each of the two imaging areas into two areas on the imaging surface of one imaging unit with a simple configuration. can do. A small imaging device can be provided. A mounting component imaging device including the imaging device can be provided.

1 is a schematic diagram illustrating an example of an imaging apparatus according to an embodiment of the present invention. FIG. 3 is a diagram illustrating an example of an image in an imaging unit of an imaging apparatus. The schematic diagram which shows an example of the imaging device which concerns on other embodiment of this invention. The figure for demonstrating an example of the imaging device which has the conventional non-telecentric optical system (a lens group etc.), (a) is an example of the image imaged on the imaging surface (imaging surface) via the non-telecentric optical system (B) is a schematic diagram of a non-telecentric optical system.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The embodiment of the present invention includes the contents shown in the drawings, but is not limited to this. In the following description of each drawing, parts that are common to the parts that have already been described are assigned the same reference numerals, and duplicate descriptions are partially omitted.

  FIG. 1 is a schematic diagram illustrating an example of an imaging apparatus 100 according to an embodiment of the present invention. FIG. 2 is a diagram illustrating an example of an image in the imaging unit of the imaging apparatus 100.

An imaging apparatus 100 according to an embodiment of the present invention includes a reflective optical element 1 (first reflective optical element), a reflective optical element 2 (second reflective optical element), an object-side telecentric optical system 30, and an imaging unit. 21 and the like.
The imaging unit 21 is disposed in the light-shielding dark box 12. The imaging unit 21 is configured by an imaging element such as a CCD, CMOS, or MOS, for example. In the present embodiment, the light from the two imaging areas A1 and A2 respectively passes through the common object-side telecentric optical system 30 and the two areas PA1 and PA2 on the imaging surface (imaging surface) of one imaging unit 21. The images are divided into two. In the imaging apparatus 100 according to the embodiment of the present invention, on the imaging surface of the imaging unit 21, the portion D where the light amount from the two imaging areas A1 and A2 is lost becomes very small, or the light amount is lost. It is configured so that there is no portion D.

In the present embodiment, the first imaging area A1 is disposed in front of the object side telecentric optical system 30 (object side) and is located in a plane substantially perpendicular to the optical axis of the object side telecentric optical system 30. The second imaging area A2 is disposed between the first imaging area A1 and the object side telecentric optical system 30, and is located in a plane inclined with respect to the optical axis of the object side telecentric optical system 30.
The reflective optical elements 1 and 2 are disposed between the first imaging area A1 and the second imaging area A2 and the object side telecentric optical system 30. The reflective optical elements 1 and 2 are composed of, for example, a total reflection mirror.

The object side telecentric optical system 30 includes optical elements 5 to 8 such as lenses, an aperture portion 9 as an aperture stop, optical elements 10 and 11 such as lenses, and the like. Specifically, from the object side to the image surface side, the optical element 5 as a biconvex first lens having a positive refractive power with the convex surface facing the object side and the image surface side, and a concave surface on the image surface side. An optical element 6 as a meniscus second lens having a positive refractive power toward the optical element 7, and an optical element 7 as a biconvex third lens having a positive refractive power with a convex surface directed toward the object side and the image plane side, The optical element 8 as a bi-concave fourth lens having a negative refractive power, which is cemented to the third lens (optical element 7) and has concave surfaces directed to the object side and the image surface side, and has a convex surface directed to the image surface side. An optical element 10 as a convex meniscus fifth lens having positive refractive power, and an optical element 11 as a biconvex sixth lens having positive refractive power with the convex surfaces facing the object side and the image side. They are sequentially arranged along the optical axis. Between the optical element 8 as the fourth lens and the optical element 10 as the fifth lens, a diaphragm portion 9 as an aperture diaphragm having a predetermined aperture is disposed.
Note that the object-side telecentric optical system 30 is not limited to the above-described form, and may be in any form, and may be in a form according to an object to be imaged or an external environment.

  In the present embodiment, in this arrangement configuration, the reflective optical element 1 and the reflective optical element 2 are arranged in front of the optical element 5 (object side) as the first lens of the object side telecentric optical system 30. An imaging surface (image surface) of the imaging unit 21 such as a CCD is disposed behind the optical element 10 as the sixth lens of the object side telecentric optical system 30 (image surface side).

  The object side telecentric optical system 30 is configured to form an image of light from the first imaging area A1 in the first area PA1 on the imaging surface of the imaging unit 21. Specifically, the light from the first imaging area A1 is incident on a part of the optical element 5 as the first lens of the object side telecentric optical system 30, and then the first on the imaging surface of the imaging unit 21. An image is formed on the area PA1.

The light from the second imaging area A2 is reflected by the reflection optical element 2 as a total reflection mirror, and after being reflected by the reflection optical element 1 as a total reflection mirror, enters the object side telecentric optical system 30. .
In addition, the reflective optical element 1 blocks an optical path from the first imaging area A1 to the second area PA2 on the imaging surface of the imaging unit 21. Specifically, the reflective optical element 1 converts light from the first imaging area A1 into light from the second imaging area A2 in the object-side surface of the first lens of the object-side telecentric optical system 30. It is arrange | positioned in the position which prevents injecting into the area | region which passes. The reflective optical element 1 is configured to restrict the light from the first imaging area A1 to form an image only in the first area PA1 on the imaging surface of the imaging unit 21. That is, in the reflecting optical element 1, the surface on the optical element 5 side (image surface side) is a reflecting surface, and the object side surface is a shielding part.
The reflective optical element 1 is a region through which light from the second imaging area A2 passes through light from the first imaging area A1 on the object side surface of the first lens of the object side telecentric optical system 30. It arrange | positions so that it may inject into area | regions other than.

  The reflective optical element 1 is a region through which light from the first imaging area A1 passes through the object-side surface of the first lens of the object-side telecentric optical system 30 through the light from the second imaging area A2. It is arrange | positioned in the position which prevents entering.

The imaging apparatus 100 according to the present embodiment reflects the optical path from the second imaging area A2 to the object side telecentric optical system 30 so that the optical path from the first imaging area A1 to the object side telecentric optical system 30 intersects. Optical elements (reflection optical element 1, reflection optical element 2) are arranged.
Specifically, the reflective optical element 1 and the reflective optical element 2 are arranged at a predetermined interval, and between the reflective optical element 1 and the reflective optical element 2, the first imaging area A1 to the object side telecentric optical system. The optical path to the optical element 5 as the first lens 30 is positioned.
The light from the second imaging area A2 intersects the optical path from the first imaging area A1 to the optical element 5 of the object side telecentric optical system 30, is reflected by the reflective optical element 2, and is again the first imaging. After crossing the optical path from the area A1 to the optical element 5 of the object side telecentric optical system 30, the light enters the reflection optical element 1, is reflected by the reflection optical element 1, and serves as the first lens of the object side telecentric optical system 30. The light enters the optical element 5.

The reflective optical element 2 reflects light from the second imaging area A2 and makes it incident on the object-side telecentric optical system 30 via the reflective optical element 1 (first reflective optical element). The optical path length from the imaging area A2 to the imaging unit 21 via the object side telecentric optical system 30 is made to coincide with the optical path length from the first imaging area A1 to the imaging unit 21 via the object side telecentric optical system 30. It is arranged to move freely.
The reflective optical element 2 reflects the light from the second imaging area A2, and passes through the reflective optical element 1 (first reflective optical element) to the object side telecentric optical system 30 and the first optical path length. The optical path length from the imaging area A1 to the object side telecentric optical system 30 is movably arranged.
In the present embodiment, the reflecting optical element 2 has a reflecting surface disposed substantially parallel to the optical path from the first imaging area A1 to the object side telecentric optical system 30, and from the first imaging area A1. It is arranged so as to be movable in a direction substantially orthogonal to the optical path to the object side telecentric optical system 30. By doing so, it is possible to form a clear image in each of the areas PA1 and PA2 on the imaging surface of the imaging unit 21.

  The reflective optical element 1 (first reflective optical element) transmits light from the second imaging area A2 reflected by the reflective optical element 2 to the object-side telecentric optical system 30 according to the moving distance of the reflective optical element 2. The angle is adjustable so as to be incident. In this case, even if the optical path is slightly shifted due to the movement of the reflective optical element 2, the light from the second imaging area A2 reflected by the reflective optical element 2 is incident on the object side telecentric optical system 30. An image can be reliably formed in the second area PA2 of the imaging unit 21.

The operation of the imaging apparatus 100 of the above embodiment will be described.
Light from the first imaging area A1 is incident on one object-side telecentric optical system 30, and then forms an image on the first area PA1 on the imaging surface of one imaging unit 21.
The light from the second imaging area A2 is reflected by the reflection optical element 2 as a total reflection mirror and after being reflected by the reflection optical element 1 as a total reflection mirror, and then enters the same object side telecentric optical system 30. After being incident, an image is formed on the second area PA2 on the imaging surface of one imaging unit 21.
When adjusting so that the optical path length from the first imaging area A1 to the first area PA1 of the imaging unit 21 matches the optical path length from the second imaging area A2 to the second area PA2 of the imaging unit 21 This adjustment can be performed by moving the reflective optical element 2. In this case, the optical path deviation is corrected by finely adjusting the angle of the reflective optical element 1.

<Other Embodiments of the Present Invention>
FIG. 3 is a schematic diagram showing an example of an imaging apparatus 100B according to another embodiment of the present invention.
The imaging apparatus 100B of the present embodiment has an optical system configured to simultaneously capture two orthogonal imaging areas A1 and A2, and, for example, is common to the first imaging area A1 and the second imaging area A2. One object to be imaged can be arranged, and one object to be imaged can be imaged from different angles. Although an example in which the angle between the first imaging area A1 and the second imaging area A2 is set to 90 ° will be described, this angle may be an arbitrary angle. The description of the same configuration as that of the embodiment shown in FIG.

The imaging apparatus 100B according to the embodiment of the present invention includes a reflection optical element 3 such as a total reflection mirror and a reflection optical element 4 such as a total reflection mirror.
The reflection optical element 4 has a reflection surface formed on the image plane side, and is disposed so as to reflect light from the first imaging area A1 and enter the reflection optical element 3. The reflective optical element 3 is disposed so as to reflect the light from the reflective optical element 4 and to enter the object side telecentric optical system 30.
That is, as compared with the imaging apparatus 100 of the above embodiment, the imaging apparatus 100B converts the light from the first imaging area A1 at the position of the second imaging area A2 or a position near the second imaging area A2 into the reflective optical element 4 such as a total reflection mirror. The reflecting optical element 3 can enter the object side telecentric optical system 30.
As described above, the imaging apparatus 100B can shorten the length along the axial direction of the object-side telecentric optical system 30 as compared with the imaging apparatus 100, and can provide a small-sized imaging apparatus 100B.

<Mounted component imaging device>
For example, the imaging devices 100 and 100B according to the present invention image a component mounted on a board or the like before mounting, and perform processing such as checking the correctness of the component or checking the position of the component. Used. Specifically, the imaging device 100 according to the present invention is used as a mounting component imaging device in a component mounting device that picks up and picks up a component such as an electronic component by a suction nozzle and moves the component to a predetermined position such as a substrate. , 100B is adopted. The component mounting apparatus captures an image of a component, a suction nozzle, and the like with an imaging device, specifies the relative positional relationship between the component and the suction nozzle based on the obtained image data, and corrects a slight positional deviation of the component. Thus, the component can be mounted on the substrate or the like with high accuracy.

As described above, the imaging apparatus according to the present invention couples light from the first imaging area A1 and the second imaging area A2 to the separate areas PA1 and PA2 on the imaging surface of one imaging unit 21. Let me image. The imaging apparatus includes a reflective optical element 1 as a total reflection mirror that reflects light from the second imaging area A2, and a first area on the imaging surface of the imaging unit 21 that reflects light from the first imaging area A1. An object-side telecentric optical system 30 that forms an image on the PA 1 and forms an image on the second area PA 2 on the imaging surface of the imaging unit 21 with the light from the second imaging area A 2 reflected by the reflective optical element 1. Have. The reflective optical element 1 shields the optical path from the first imaging area A1 to the second area PA2 on the imaging surface of the imaging unit 21, and also reflects the light from the first imaging area A1 on the imaging surface of the imaging unit 21. It is configured to restrict the image to be formed only in the upper first area PA1.
That is, the light from each imaging area A1, A2 is divided into two areas PA1, PA2 on the imaging surface of one imaging unit 21 via one object-side telecentric optical system 30 to form a clear image. A small imaging device that can be obtained can be provided.
Specifically, on the imaging surface of the imaging unit 21, the portion D where the amount of light is lost can be made extremely small, and a clear image can be obtained for each area.

  For example, even when a low-pixel-number image sensor is used for the image pickup unit 21, the resolution necessary for recognizing each image can be ensured, and it is not necessary to use a high-quality image sensor. And an inexpensive imaging device can be provided.

In addition, the imaging apparatus according to the embodiment of the present invention is configured to be able to adjust the positional relationship between the object side telecentric optical system 30 and the reflective optical elements 2 and 1 such as a total reflection mirror. Specifically, the reflective optical element 2 reflects the light from the second imaging area A2 and enters the object-side telecentric optical system 30 via the reflective optical element 1 (first reflective optical element). The optical path length from the second imaging area A2 to the imaging unit 21 via the object side telecentric optical system 30 is made to coincide with the optical path length from the first imaging area A1 to the imaging unit 21 via the object side telecentric optical system 30. It is arranged so that it can move freely. Further, the optical path shift is corrected by finely adjusting the angle of the reflective optical element 1.
As described above, the optical path lengths can be easily adjusted so as to coincide with each other, and light from the first imaging area A1 and the second imaging area A2 is transmitted through the single object-side telecentric optical system 30 as 1. A clear image can be obtained by forming an image in two areas PA1 and PA2 on the imaging surface of one imaging unit 21.

In the imaging device according to the embodiment of the present invention, the light from the second imaging area A2 intersects the optical path from the first imaging area A1 to the optical element 5 of the object side telecentric optical system 30, and is reflected. After being reflected by the optical element 2 and again intersecting the optical path from the first imaging area A1 to the optical element 5 of the object side telecentric optical system 30, it is incident on the reflective optical element 1 and is reflected by the reflective optical element 1. The light enters the optical element 5 as a first lens of the object side telecentric optical system 30.
For this reason, the length along the axial direction of the object side telecentric optical system 30 can be shortened, and a small imaging device can be provided.

  Further, by using the imaging devices 100 and 100B according to the present invention as a mounting component imaging device in a component mounting device that mounts a component such as an electronic component on a substrate, imaging is performed before the component is mounted on the substrate or the like. It is possible to easily perform processing such as checking the correctness of the parts, checking the position of the parts, and the like.

As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and there are design changes and the like without departing from the gist of the present invention. Is included in the present invention.
Further, the embodiments described in the above drawings can be combined with each other as long as there is no particular contradiction or problem in the purpose and configuration.
Moreover, the description content of each figure can become independent embodiment, respectively, and embodiment of this invention is not limited to one embodiment which combined each figure.

  The imaging device of the above-described embodiment is configured such that light from the two imaging areas A1 and A2 passes through the reflective optical system telecentric optical system and forms an image on the imaging surface (imaging surface) of the imaging unit. However, it is not limited to this form. For example, the imaging device may be configured to capture light from a plurality of imaging areas.

  DESCRIPTION OF SYMBOLS 1 ... Reflection optical element (total reflection mirror; 1st reflection optical element), 2 ... Reflection optical element (total reflection mirror; 2nd reflection optical element), 3 ... Reflection optical element (total reflection mirror), 4 ... Reflection Optical element (total reflection mirror), 5 ... Optical element (first lens), 6 ... Optical element (second lens), 7 ... Optical element (third lens), 8 ... Optical element (fourth lens) ), 9 ... Aperture part (aperture stop), 10 ... Optical element (fifth lens), 11 ... Optical element (sixth lens), 21 ... Imaging part (imaging element), 30 ... Object side telecentric optical system, 100, 100B: Imaging device.

Claims (3)

An imaging device that forms an image of light from a first imaging area and a second imaging area on a single imaging unit,
A first reflective optical element that reflects light from the second imaging area;
The light from the first imaging area is imaged on the first area on the imaging surface of the imaging unit, and the light from the second imaging area reflected by the first reflective optical element is An object-side telecentric optical system that forms an image on a second area on the imaging surface of the imaging unit,
The first reflective optical element shields an optical path from the first imaging area to the second area on the imaging surface of the imaging unit, and transmits light from the first imaging area to the imaging unit. Configured to form an image only in the first area on the imaging surface of
The light from the second imaging area is reflected and incident on the object side telecentric optical system via the first reflective optical element, and from the second imaging area via the object side telecentric optical system. A second reflective optical element movably disposed so as to match the optical path length to the imaging unit with the optical path length from the first imaging area to the imaging unit via the object side telecentric optical system; Prepared,
A reflective optical element is disposed so that an optical path from the second imaging area to the object side telecentric optical system intersects an optical path from the first imaging area to the object side telecentric optical system. An imaging device. The first reflective optical element reflects light from the second imaging area reflected by the second reflective optical element according to a moving distance of the second reflective optical element, to the object side telecentric optical system. The image pickup apparatus according to claim 1 , wherein the image pickup apparatus is configured to be adjustable in angle so as to enter the light. Mounting component imaging device having an imaging device according to claim 1 or claim 2.

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