JP2004048481A - Imaging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imaging device for achieving reduction in cost and size simultaneously. <P>SOLUTION: An imaging device 1 images simultaneously or selectively different two regions A, B positioned on the same surface by a single imaging system. A special prism member 12 having a half mirror surface 22 and a total reflection mirror surface 23 is adopted for the imaging device 1, and a light entered from a first incident surface 20 and reflected from the half mirror surface 22 is reflected from the total reflection mirror surface 23 so as to return to the half mirror surface 22. With an adoption of such the prism member 12, the two regions A, B can be imaged simultaneously or selectively by the single imaging system composed of an imaging means 6 and an image-forming lens part 8. As the result, the imaging device 1 is reduced in manufacturing cost and in size. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
More particularly, the present invention relates to an image pickup apparatus for use in mounting a component supply cassette having two rows of component transport paths in an electronic component mounting apparatus.
[0002]
[Prior art]
As shown in FIG. 5, this type of imaging apparatus 100 generally used in the related art has two imaging systems, and has two CCDs 101 and 102 arranged side by side and two CCDs 101 and 102 arranged side by side. It has two image forming lenses 103 and 104, and reflecting mirrors 105 to 108 for changing each optical path, and is configured to individually capture a portion separated by a predetermined distance by each imaging system. I have. Therefore, when setting the component supply cassette (so-called “parts cassette”) 109 in the electronic component mounting apparatus, it is necessary to accurately set the two component outlets 110 and 111 provided in the component supply cassette 109 to the nozzle suction position. In addition, during the setting operation, each of the component outlets 110 and 111 is imaged by the above-described imaging device 100. Then, while adjusting the position of the component supply cassette 109 on the basis of the imaging result, the respective component outlets 110 and 111 are moved to the nozzle suction position, and the accurate positions of the respective component outlets 110 and 111 and the nozzle suction position are adjusted. After the alignment, the component supply cassette 109 is installed and fixed in the electronic component mounting apparatus.
[0003]
[Problems to be solved by the invention]
However, the above-described conventional imaging device has the following problems. That is, the above-described imaging apparatus 100 requires two imaging systems to simultaneously or selectively image two reading parts separated at a predetermined interval, which is disadvantageous in cost and at the same time, itself. There was a problem that the size was increased and the handling at the time of work was deteriorated.
[0004]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an image pickup apparatus capable of simultaneously achieving cost reduction and size reduction.
[0005]
[Means for Solving the Problems]
An image pickup apparatus according to the present invention is an image pickup apparatus which picks up an image of a first reading portion and a second reading portion which are located on the same plane. One imaging means for receiving the light reflected by the second reading part and imaging each reading part, one imaging lens unit disposed in front of the imaging means in the housing, and forming an image in the housing. A prism member disposed in front of the image lens unit, the prism member facing a first incident surface on which light reflected by the first reading portion is incident, and a second reading surface facing the first incident surface; A second incident surface on which light reflected by the site is incident, and a predetermined angle between the first incident surface and the second incident surface, the second incident surface being disposed between the first incident surface and the second incident surface; Harness extended to face each other A mirror surface, the light reflected by the half mirror surface is incident from the first incident surface, and having a total reflection mirror surface for reflecting the half-mirror surface.
[0006]
This imaging apparatus is to simultaneously or selectively image two different parts located on the same plane by one imaging system. The image pickup apparatus employs a special prism member having a half mirror surface and a total reflection mirror surface, and light incident from the first incident surface and reflected by the half mirror surface is reflected by the total reflection mirror surface. As a result, the light is reflected back to the half mirror surface. Therefore, when imaging the two reading portions, the light incident from the second incident surface and reflected by the half mirror surface and the light incident from the first incident surface and reflected by the total reflection mirror surface are reflected by the half mirror surface. By transmitting the transmitted light in the same direction from the prism member, two parts can be simultaneously or selectively imaged by one imaging system including an imaging unit and an imaging lens unit, As a result, a reduction in the manufacturing cost of the imaging device and a reduction in the size of the imaging device are realized.
[0007]
Further, it is preferable that a correction prism for correcting the optical path length is disposed on the first optical path between the first incident surface and the first reading portion in the housing. When the above-described prism member is employed, light incident from the first incident surface reciprocates between the half mirror surface and the total reflection mirror surface, and as a result, the optical path length therebetween increases. I will. Therefore, it is necessary to adjust the focus position of the imaging system including the imaging means and the imaging lens unit to two different reading portions on the same plane. As a countermeasure, a first correction prism made of glass or the like is used. And the focusing position is adjusted to two reading portions by using the refractive index of the prism.
[0008]
Further, it is preferable that a correction half mirror for correcting the amount of light is disposed on a second optical path between the second incident surface and the second reading portion in the housing. In this case, when imaging each reading portion, the light incident from the second incident surface and reflected by the half mirror surface and the light incident from the first incident surface and reflected by the half mirror surface and the total reflection mirror surface are used. A correction half mirror is arranged on the second optical path so that a light amount difference does not occur between the light transmitted through the half mirror surface. This is done in view of the specificity of the prism member. That is, such a configuration is such that there is no difference in the amount of light between the light beams incident on the imaging means due to the number of times of reflection and the number of times of transmission with respect to the half mirror surface.
[0009]
Further, it is preferable that a shutter for selectively blocking the first optical path and the second optical path be provided on the light incident window side of the housing. With such a shutter, each image of the reading portion can be taken independently, and it can be said that this is suitable for a case where individual imaging of two reading portions is required.
[0010]
Further, it is preferable that a shutter that opens the first optical path and the second optical path at the same time is provided on the light incident window side of the housing. With such a shutter, the image of the first reading portion and the image of the second reading portion can be taken in a superimposed manner, and the position of each reading portion can be easily adjusted.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of an imaging device according to the present invention will be described in detail with reference to the drawings.
[0012]
As shown in FIG. 1, an imaging device 1 includes a component supply cassette (so-called “parts cassette”) 4 having two rows of component transport paths 2 and 3 in an X-axis direction in an electronic component mounting device (not shown). And is used for installation and fixing on a base (not shown) movable in the Y-axis direction. When setting the parts cassette 4 in the electronic component mounting apparatus, it is necessary to accurately set the two component take-out ports 2a and 3a provided in the parts cassette 4 to the component suction position of the suction nozzle. At the time of this setting, the image pickup device 1 picks up an image of each of the component outlets 2a and 3a, and the worker adjusts the installation position of the parts cassette 4 based on the imaged result.
[0013]
As shown in FIGS. 1 and 2, an imaging device 1 used for installing a parts cassette 4 having two rows of component conveyance paths 2 and 3 is a rectangular solid box housing one CCD (imaging means) 6. The housing 10 includes a unit 7 and a cylindrical tube unit 9 that accommodates one imaging lens unit 8 disposed in front of the CCD 6. The CCD 6 receives the light reflected at the first reading portion A around the first component take-out port 2a and captures an image thereof, and at the same time, around the second component take-out port 3a. The light reflected at the second reading portion B is received and an image thereof is taken. Therefore, the imaging device 1 is intended to simultaneously or selectively capture two types of images on one CCD 6.
[0014]
Further, the imaging device 1 has a plurality of LEDs (illuminating means) 11 arranged in a ring around the distal end of the cylindrical portion 9. Each LED 11 is housed in a skirt portion 13 fixed to the tube portion 9 and attached to a substrate 14 in the skirt portion 13 so as to be inclined toward the reading portions A and B so as to uniformly illuminate the reading portions A and B. (See FIG. 3). Therefore, the first and second reading portions A and B are uniformly illuminated by the respective LEDs 11, and the illumination enables imaging by the CCD 6.
[0015]
Further, since it is necessary to image the two reading parts A and B, the optical path P between the CCD 6 and the parts cassette 4 is changed to the first optical path P1 and the second optical path P between the imaging lens unit 8 and the parts cassette 4. It is necessary to branch to the optical path P2. Therefore, a prism member 12 formed of a cubic cube is disposed in front of the imaging lens unit 8 in the cylindrical portion 9 of the housing 10.
[0016]
As shown in FIG. 4, the prism member 12 has a first incident surface 20 that reflects light from the first reading portion A and passes light passing through the first optical path P <b> 1, and faces the first incident surface 20. And a second incident surface 21 on which light passing through the second optical path P2 reflected by the second reading portion B is incident. Further, the prism member 12 is disposed between the first incident surface 20 and the second incident surface 21 and faces the first incident surface 20 and the second incident surface 21 at an angle of 45 degrees. And a total reflection mirror surface 23 that reflects light incident on the first incident surface 20 and reflected by the half mirror surface 22 toward the half mirror surface 22. are doing.
[0017]
More specifically, the total reflection mirror surface 23 is formed on a surface on the reading portions A and B sides extending so as to connect between the first incident surface 20 and the second incident surface 21, and the total reflection mirror surface 23 is formed. By making the mirror surface 23 face the imaging lens unit 8, light reflected by the total reflection mirror surface 23 can be made incident on the imaging lens unit 8. The total reflection mirror surface 23 extends at an angle of 45 degrees with respect to the half mirror surface 22. Accordingly, light that has entered the first incident surface 20 through the first optical path P1 can be appropriately incident on the imaging lens unit 8. The light incident from the left and right incident surfaces 20 and 21 enters the imaging lens unit 8 along one optical path P based on the function of the prism member 12, and thereafter enters the CCD 6. Will be.
[0018]
The above-described imaging apparatus 1 captures two different reading parts A and B located on the same plane simultaneously or selectively by one imaging system. The imaging apparatus 1 employs a special prism member 12 having a half mirror surface 22 and a total reflection mirror surface 23. Therefore, light incident from the first incident surface 20 along the optical path P1 and reflected by the half mirror surface 22 is reflected by the total reflection mirror surface 23 so as to return to the half mirror surface 22. Light incident from the second incident surface 21 along the optical path P2 is only reflected by the half mirror surface 22.
[0019]
As described above, by adopting the special prism member 12, when imaging the two reading portions A and B, the light incident from the second incident surface 21 and reflected by the half mirror surface 22 and the first incident light The light that has entered from the surface 20 and has been reflected by the total reflection mirror surface 23 and then transmitted through the half mirror surface 22 can be emitted from the prism member 12 toward the imaging lens unit 8 in the same direction. Thereby, two reading parts A and B can be simultaneously or selectively imaged by one imaging system including the CCD (imaging means) 6 and the imaging lens unit 8, and as a result, the imaging apparatus 1 Therefore, the reduction of the manufacturing cost and the miniaturization of the imaging device 1 are realized.
[0020]
Here, in the cylindrical portion 9 of the housing 10, on a first optical path P1 between the first incident surface 20 and the first reading portion A, there is provided a glass correcting member for correcting the optical path length. A prism 26 is provided. When the above-described prism member 12 is employed, light incident from the first incident surface 20 reciprocates between the half mirror surface 22 and the total reflection mirror surface 23, and the optical path length therebetween becomes longer. (See FIG. 4). As a result, a situation occurs in which the first optical path P1 is focused at the position indicated by the symbol F (see FIG. 2).
[0021]
Therefore, it is necessary to adjust the focus position of the imaging system including the CCD 6 and the imaging lens unit 8 to two different reading parts A and B on the same plane. As a countermeasure, a correction prism 26 made of glass or the like is arranged on the first optical path P1, and each focus position is determined by using the refractive index of the prism 26 to two reading portions A and B on the same plane. I try to match. The prism 26 has a reflecting surface 26a for bending the optical path P1 at a right angle. It goes without saying that the prism 26 used for correcting the optical path length is appropriately selected from materials and lengths according to the correction amount.
[0022]
Further, in the cylindrical portion 9 of the housing 10, a correction half mirror 27 for correcting the light amount is disposed on the second optical path P2 between the second incident surface 21 and the second reading portion B. . That is, when imaging each of the reading parts A and B, the light incident from the second incident surface 21 and reflected by the half mirror surface 22 and the light incident from the first incident surface 20 and reflected by the half mirror surface 22 and total reflection The correction half mirror 27 is disposed on the second optical path P2 so that the light amount does not differ from the light transmitted through the half mirror surface 22 after being reflected by the mirror surface 23. This is done in view of the specificity of the prism member 12. That is, such a half mirror 27 is employed so that there is no difference in the amount of light of each light incident on the CCD 6 due to the number of times of reflection and the number of times of transmission on the half mirror surface 22. The correction half mirror 27 has a reflection / transmission surface 27a having a 45-degree inclination angle to bend the optical path P2 at a right angle.
[0023]
As shown in FIGS. 2 and 3, a circular first light entrance window 28 through which the first optical path P1 passes and a circular first light window 28 through which the second optical path P2 passes are provided at the tip of the cylindrical portion 9 of the housing 10. A second light entrance window 29 is formed. A cup-shaped shutter 30 that is rotatable in the horizontal direction is fitted into the distal end of the tubular portion 9, and the shutter 30 is appropriately rotated by a lever 31 that protrudes in the horizontal direction. A shutter window 32 is formed on the bottom surface of the shutter 30. By making the shutter window 32 V-shaped, the first optical path P1 and the second optical path P2 are selectively or simultaneously opened. .
[0024]
For example, when the shutter window 32 is arranged at the position shown by the solid line by the rotation operation of the lever 31, the first light entrance window 28 and the second light entrance window 29 can be opened at the same time. Thus, the image of the first reading region A and the image of the second reading region B can be imaged so as to overlap each other, and the position of each of the reading regions A and B can be easily adjusted.
[0025]
Next, when the shutter window 32 is arranged at the position indicated by the dashed line by the rotation operation of the lever 31, the first light incident window 28 is closed and the second light incident window 29 is opened. Become. When the shutter window 32 is arranged at the position indicated by the dashed line by the rotation operation of the lever 31, the first light entrance window 28 is opened and the second light entrance window 29 is closed. . By such selective opening and closing, each image of the reading parts A and B can be independently taken. This can be said to be suitable when it is necessary to individually image the two reading parts A and B, for example, when confirming whether or not each reading part A and B is within the imaging area of the CCD 6. .
[0026]
【The invention's effect】
Since the imaging device according to the present invention is configured as described above, the following effects are obtained. That is, in an imaging device for imaging different first reading parts and second reading parts located on the same plane, the imaging device is arranged in a housing, and the light reflected by the first reading parts and the second reading parts One imaging unit that receives the light reflected by the imaging unit and captures an image of each reading portion, one imaging lens unit disposed in front of the imaging unit in the housing, and in front of the imaging lens unit in the housing. A prism member disposed, wherein the prism member faces the first incident surface on which the light reflected by the first reading portion is incident, and reflects the light reflected by the second reading portion on the first reading surface. The second incident surface to be incident is disposed between the first incident surface and the second incident surface, and is extended so as to face the first incident surface and the second incident surface at a predetermined angle. Half mirror surface The light reflected by the half mirror surface is incident from the first incident surface, by having a total reflection mirror surface for reflecting the half-mirror surface, it is possible to achieve a reduction and downsizing of the cost simultaneously.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating an embodiment of an imaging device according to the present invention.
FIG. 2 is an enlarged sectional view of a main part of the imaging device shown in FIG.
FIG. 3 is a bottom view of the imaging device shown in FIG. 1;
FIG. 4 is a schematic diagram illustrating a main part of the imaging device illustrated in FIG. 1;
FIG. 5 is a schematic diagram showing a conventional imaging device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Imaging device, 6 ... CCD (imaging means), 8 ... Imaging lens part, 10 ... Housing, 12 ... Prism member, 20 ... First incident surface, 21 ... Second incident surface, 22 ... Half mirror surface , 23: Total reflection mirror surface, 26: Correcting prism, 27: Correcting half mirror, 28, 29: Light entrance window, 30: Shutter, A: First reading portion, B: Second reading portion, P1 ... first optical path, P2 ... second optical path.

Claims (5)

In an imaging device for imaging different first reading parts and second reading parts located on the same plane,
One image pickup unit disposed in the housing, receiving light reflected at the first reading portion and light reflected at the second reading portion, and imaging each of the reading portions;
One imaging lens unit disposed in front of the imaging unit in the housing;
A prism member disposed in front of the imaging lens unit in the housing,
The prism member,
A first incident surface on which light reflected by the first reading portion is incident;
A second incident surface facing the first incident surface and receiving light reflected by the second reading portion;
A half mirror disposed between the first incident surface and the second incident surface and extended so as to face the first incident surface and the second incident surface at a predetermined angle. Face and
An imaging device, comprising: a total reflection mirror surface that reflects light incident from the first incident surface and reflected by the half mirror surface toward the half mirror surface. 2. A correction prism for correcting an optical path length is arranged on a first optical path between the first incident surface and the first reading portion in the housing. Imaging device. 2. A correction half mirror for correcting a light amount is disposed on a second optical path between the second incident surface and the second reading portion in the housing. 2. The imaging device according to 2. The imaging device according to any one of claims 1 to 3, wherein a shutter that selectively blocks the first optical path and the second optical path is provided on a light incident window side of the housing. apparatus. The imaging device according to claim 1, wherein a shutter that opens the first optical path and the second optical path at the same time is provided on a light incident window side of the housing.

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