JP2012129454A - Light detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light detector which easily corresponds to a change in a size and a shape of an object to be detected, and has good assemblability.SOLUTION: A light detector 10 comprises: a light emission wall and a light-receiving wall disposed opposite each other; a light emission window and a light-receiving window provided on the light emission wall and the light-receiving wall; a case body 5 having a light emission element block holding part and a light-receiving element block holding part; a light emission element block and a light-receiving element block; and a light emission element holding substrate and a light-receiving element holding substrate. The light emission element holding substrate 6 in which the light emission element block is installed therein and the light-receiving element holding substrate 7 in which the light-receiving element block is installed therein are installed in the case body to detect the presence or absence of an object to be detected based on light ray passing through the light emission window and the light-receiving window.

Description

  The present invention relates to a light detection device in which a light emitting element and a light receiving element are arranged to face each other, and the presence or absence of an object to be detected passing between them is detected in a non-contact manner.

  2. Description of the Related Art In recent years, a light detection device has been used in which a light emitting element and a light receiving element are arranged to face each other and the presence or absence of an object passing between them is detected in a non-contact manner.

  Since the above-mentioned photodetection device is composed of semiconductor elements, it is widely adopted because of its simple configuration, low power consumption, and high detection performance, and various proposals have been made for its configuration (for example, Cited reference 1, cited reference 2).

The prior art shown in each cited document will be described below with reference to the drawings. In each prior art, the component names and the like are the same as those of the present invention within the scope not changing the gist of the invention.
FIG. 14 is a cross-sectional view of the photodetection device (photointerrupter) described in the cited document 1. The photodetection device 100 includes a light emitting element substrate 102 on which the light emitting element block 101 is mounted and a light receiving element on which the light receiving element block 103 is mounted. A mold body 105 having a substrate 104, through-holes 105a and 105b for accommodating the light-emitting element block 101 and the light-receiving element block 103, and a positioning pin 106, provided with a detection object passage portion 109 having a U-shaped cross section, and a mold The slit 105 is provided on one of the opposing surfaces of the U-shaped detection object passage portion of the body 105.

  Next, the configuration and operation of the light detection apparatus 100 will be described. The light detecting device 100 is positioned and fixed to a measuring device (not shown) by positioning pins 106, and is configured such that the light beam P emitted from the light emitting element block 101 is received by the light receiving element block 103 through the slit plate 107. Yes. The detected object passes through the U-shaped detected object passing portion 109 of the mold body 105 and crosses the light beam P, thereby detecting the presence or absence of the detected object in a non-contact manner.

FIG. 15 is a cross-sectional view of the light detection device (optical coupling device) described in the cited document 2. The light detection device 200 is connected to the light emitting element lead member 202 connected to the light emitting element block 201 and to the light receiving element block 203. The light receiving element lead member 204 and a case body 205 formed by punching and bending a metal plate. The case body 205 has slit portions 205c and 205d that are open with a U-shaped cross-section of the detected object passage portion 209 interposed therebetween. The light emitting element block 101 and the light receiving element are disposed at positions corresponding to the slit portions 205c and 205d. A light emitting element block holding portion 205a for storing the block 103 and a light receiving element block holding portion 205b are formed.

  Next, the configuration and operation of the light detection apparatus 200 will be described. The light detecting device 200 is positioned and fixed to a measuring device (not shown) by a light emitting element lead member 202 and a light receiving element lead member 204, and a light flux P emitted from the light emitting element block 201 is received through the slit portions 205c and 205d. The element block 203 is configured to receive light. The detected object passes through the U-shaped detected object passing portion 209 and crosses the light beam P, thereby detecting the presence or absence of the detected object in a non-contact manner.

JP 2000-12892 A JP 2002-208727 A

  However, since the photodetection device 100 in the cited document 1 is incorporated in a resin-molded mold body 105, it is necessary to change the height and width of the detection object passage portion 109 depending on the size of the detection object. It is necessary to recreate a special mold body by raising a new mold according to the size and shape of the mold.

  In the light detection device 200 in the cited document 2, since the case body 205 is formed by bending a metal plate, it can be relatively easily deformed according to the size and shape of the object to be detected. Since the light receiving element block 203 is integrally formed with the lead member, when the height or width of the detected object passage portion 209 is changed depending on the size of the detected object, the light emitting element block 201 having a different length of the lead member. In addition, it is necessary to prepare the light receiving element block 203.

  An object of the present invention is to solve the above-mentioned problems, and a light emitting element block and a light receiving element block configured independently of a case body whose shape is easy to deform, and an assembly to the light emitting element block and the light receiving element block are An object of the present invention is to provide a photodetection device that is easy to cope with changes in the size and shape of an object to be detected and that has good assemblability by making the holding member that also serves as an easy lead member separately. .

  In order to achieve the above object, in the present invention, in a light detection device that detects the presence or absence of an object to be detected by arranging a light emitting element and a light receiving element to face each other, they are coupled by a bottom portion and arranged to face each other with a predetermined interval. A light emitting wall and a light receiving wall, a light emitting window and a light receiving window provided at positions opposed to the light emitting wall and the light receiving wall, and a substantially U-shaped light emitting element block holding portion provided on each of the light emitting wall and the light receiving wall; A case body having a light receiving element block holding portion, a light emitting element block mounted on a light emitting element substrate, a light receiving element block mounted on the light receiving element substrate, and the light emitting element block and the light receiving element block are accommodated. A light-emitting element holding substrate having a notch and a light-receiving element holding substrate; a light-emitting element holding substrate incorporating the light-emitting element block; and a light receiving element incorporating the light-receiving element block The presence or absence of an object to be detected is detected by a light beam passing through the light emitting window and the light receiving window by incorporating a child holding substrate into the light emitting element block holding unit and the light receiving element block holding unit of the case body. And

  According to the above configuration, the case body, the light emitting element block, and the light receiving element block, and the holding member that also serves as a lead member that can be easily assembled to the light emitting element block and the light receiving element block, are all separated. An object of the present invention is to provide a photodetection device that can easily cope with changes in the size and shape of an object to be detected and that is easy to assemble.

  Connection electrodes are provided on the light emitting element substrate and the light receiving element substrate mounting surface side of the light emitting element holding substrate and the light receiving element holding substrate, and the light emitting element block and the light receiving element are formed in the cutout portions of the light emitting element holding substrate and the light receiving element holding substrate. In a state where the block is incorporated, the light emitting element substrate and the element electrode of the light receiving element substrate may be connected to the connection electrodes of the light emitting element holding substrate and the light receiving element holding substrate.

  The light emitting element substrate and the light receiving element substrate may be prevented from being detached by bending the tip portions of the light emitting element block holder and the light receiving element block holder in the case body.

  It is preferable to form a shield part between the light emitting element block and the light receiving element block by bending the side wall surfaces of the light emitting element block holding part and the light receiving element block holding part in the case body.

  According to the above configuration, the light emitting element block and the light receiving element block can be formed at the same time as the case body in the metal plate. A detection device can be provided.

  A protrusion for positioning with the measuring device may be provided on the bottom of the case body.

  As described above, according to the present invention, the case body, the light emitting element block, the light receiving element block, and the holding member that also serves as a lead member that can be easily assembled to the light emitting element block and the light receiving element block are all separated. Thus, it is possible to provide a light detection device that can easily cope with changes in the size and shape of the object to be detected and that is easy to assemble.

It is a perspective view of the case body of the photon detection device in the first embodiment of the present invention. It is a disassembled perspective view of the component of the photon detection apparatus in 1st Embodiment of this invention. It is a perspective view in the middle of the assembly of the photon detection device in the first embodiment of the present invention. It is a completion perspective view of the photon detection device in the first embodiment of the present invention. FIG. 3 is a detailed perspective view of the light receiving element block shown in FIG. 2. FIG. 3 is a detailed perspective view of the light receiving element block shown in FIG. 2. It is sectional drawing of the state which attached the photon detection apparatus shown in FIG. 4 to the measuring apparatus. It is a perspective view in the middle of the assembly of the photodetector in 2nd Embodiment of this invention. It is a completion perspective view of the photon detection device in the second embodiment of the present invention. It is a perspective view of the case body of the photon detection apparatus in 3rd Embodiment of this invention. It is a completion perspective view of the photon detection device in the third embodiment of the present invention. It is a completion perspective view of the photodetector in 4th Embodiment of this invention. It is sectional drawing of the state which attached the photon detection apparatus shown in FIG. 12 to the measuring apparatus. It is sectional drawing of the photon detection apparatus in a prior art. It is sectional drawing of the photon detection apparatus in a prior art.

(First embodiment)
Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 show a first embodiment of the present invention, and FIGS. 1 and 2 are exploded perspective views of the photodetecting device of the present invention. FIG. 1 shows a case body 5 formed by punching and bending a metal plate. The light emitting wall 5c and the light receiving wall 5d, which are coupled to each other by a bottom portion 5g and arranged to face each other at a predetermined interval, A light emitting window 5e and a light receiving window 5f provided at positions opposed to the light receiving wall 5d, and a substantially U-shaped light emitting element block holding part 5a and a light receiving element block holding part 5b respectively provided on the light emitting wall 5c and the light receiving wall 5d. And.

  FIG. 2 shows each element constituting the light detection device 10. In the light emitting element block 1, a light emitting element 1a sealed with resin is mounted on a light emitting element substrate 2 as described later, and element electrodes 2a and 2b are provided on the mounting surface side of the light emitting element 1a of the light emitting element substrate 2. . Similarly, in the light receiving element block 3, a resin-sealed light receiving element 3a is mounted on the light receiving element substrate 4, and element electrodes 4a and 4b are provided on the light receiving element 3a mounting surface side of the light receiving element substrate 4. The light-emitting element holding substrate 6 includes a notch 6a for housing the light-emitting element block 1, and connection electrodes 6b and 6c (not shown in the drawing) are provided on the side where the light-emitting element block 1 is assembled. Similarly, the light receiving element holding substrate 7 is provided with a notch 7 a for accommodating the light receiving element block 3, and connection electrodes 7 b and 7 c are provided on the mounting surface side of the light receiving element block 3.

  FIG. 3 is a perspective view in the middle of the assembly of the light detection device 10. The light emitting element unit 11 in which the light emitting element block 1 is incorporated in the notch 6 a of the light emitting element holding substrate 6 and the notch of the light receiving element holding substrate 7. By configuring the light receiving element unit 13 incorporating the light receiving element block 3 in 7a, the light emitting element electrodes 2a and 2b of the light emitting element substrate 2 are connected to the connection electrodes 6a and 6b of the light emitting element holding substrate 6, respectively. The light receiving element electrodes 4 a and 4 b of the light receiving element substrate 4 are connected to the connection electrodes 7 a and 7 b of the light receiving element holding substrate 7. 3 shows a state before the light emitting element unit 11 and the light receiving element unit 13 are inserted and fixed to the light emitting element block holding part 5a and the light receiving element block holding part 5b of the case body 5 as indicated by arrows. .

  FIG. 4 is a perspective view showing a completed state of the light detection device 10. That is, in a state where the light emitting element unit 11 and the light receiving element unit 13 are inserted and fixed to the light emitting element block holding part 5a and the light receiving element block holding part 5b of the case body 5, the connection electrodes 6a and 6b of the light emitting element holding substrate 6 and the light receiving element are received. The connection electrodes 7a and 7b of the element holding substrate 7 are attached to the light emitting wall 5c and the light receiving wall 5d of the case body 5 in opposite directions, so that no electrical contact occurs.

  FIG. 5 is a detailed perspective view of the light emitting element block 1, and FIG. 6 is a detailed perspective view of the light receiving element block 3. In FIG. 5, the light-emitting element block 1 has a light-emitting element 1a die-bonded to an element electrode 2a formed on the upper surface of the light-emitting element substrate 2, and is connected to the element electrode 2b by a wire 1b. And the wire 1b are sealed. That is, the light emitting element block 1 is configured by a transparent resin 1c in which the light emitting element 1a and the wire 1b are sealed, and the portion of the light emitting element block 1 is a part to be incorporated into the cutout portion 6a of the light emitting element holding substrate 6. . In this assembled state, the element electrodes 2a and 2b formed on both sides of the light emitting element substrate 2 are connected to the connection electrodes 6b and 6c of the light emitting element holding substrate 6 by pressure contact.

  In FIG. 6, in the light receiving element block 3, the light receiving element 3a is die-bonded to the element electrode 4a formed on the upper surface of the light receiving element substrate 4, and is connected to the element electrode 4b by the wire 3b, and further, the light receiving element 3a by the transparent resin 3c. And the wire 3b are sealed. That is, the light receiving element block 3 is constituted by a transparent resin 3c in which the light receiving element 3a and the wire 3b are sealed, and the portion of the light receiving element block 3 is a portion to be incorporated into the cutout portion 7a of the light receiving element holding substrate 7. . In this assembled state, the element electrodes 4a and 4b formed on both sides of the light emitting element substrate 4 are connected to the connection electrodes 7b and 7c of the light emitting element block holding substrate 7 by pressure contact.

  Next, assembly of the light detection device 10 and detection operation will be described with reference to FIG. FIG. 7 is a cross-sectional view of the state in which the light detection device 10 is attached to the measurement device 50. The light detection device 10 is positioned on the mother board 51 of the measurement device 50, and the connection electrodes 6b and 6c of the light emitting element holding substrate 6 and the light receiving element. The connection electrodes 7 b and 7 c of the holding substrate 7 are fixed to the connection electrodes 51 a and 51 b formed on the upper surface of the motherboard 51 of the measuring device 50 by means such as soldering of the solder 52. In this state, the light beam P emitted from the light emitting element block 1 is received by the light receiving element block 3 through the light emitting window 5e and the light receiving window 5f. The detected object passes through the U-shaped detected object passage portion 9 of the case body 5 and crosses the light beam P, thereby detecting the presence or absence of the detected object in a non-contact manner.

  As described above, in the light detection device 10 of the present invention, the lengths of the light emitting wall 5c and the light receiving wall 5d are adjusted in the drawing process of the case body 5 even when the shape or size of the detection object changes. In addition, by adjusting the lengths of the light-emitting element holding substrate 6 and the light-receiving element holding substrate 7, it is possible to cope without changing the configurations of the light-emitting element block 1 and the light-receiving element block 3.

(Second Embodiment)
Next, the light detection device 20 according to the second embodiment of the present invention will be described with reference to FIGS. 8 and 9 has the same basic configuration as the photodetector 10 in the first embodiment shown in FIG. 4, and therefore, the same members are denoted by the same reference numerals, and redundant description is omitted. .

  8 and 9, the light detection device 20 differs from the light detection device 10 in FIG. 4 in that the outer wall constituting the light emitting element block holding portion 5 a and the light receiving element block holding portion 5 b in the case body 5. In order to prevent the light-emitting element substrate 2 and the light-receiving element substrate 4 from coming off, a drop prevention part 5h is provided in the part. That is, as shown in FIG. 8, the length of the outer wall portion is made longer by the length of the prevention portion 5h, and the light emitting element unit 11 and the light receiving element unit 13 are made light emitting elements of the case body 5 as shown in FIG. After insertion into the block holding part 5a and the light receiving element block holding part 5b, the removal preventing part 5h is formed by bending the long end of the outer wall part. That is, in the light detection device 20, the removal preventing portion 5 h is formed by adding only one bending process to the case body 5, so that the structural reliability of the light detection device 20 can be increased.

(Third embodiment)
Next, the photodetecting device 30 according to the third embodiment of the present invention will be described with reference to FIGS. FIG. 10 is a perspective view of the case body 5 in the light detection device 30, and FIG. 11 is a completed perspective view of the light detection device 30. 10 and FIG. 11 has the same basic configuration as that of the light detection device 20 in the second embodiment shown in FIG. To do.

  10 and 11, the light detection device 30 is different from the light detection device 20 in FIG. 9 in that the inner wall constituting the light emitting element block holding portion 5 a and the light receiving element block holding portion 5 b in the case body 5. In other words, shield portions 5 i 1 and 5 i 2 are provided to shield the light emitting element block 1 and the light receiving element block 3.

  That is, as shown in FIG. 10, plate members for forming the shield portions 5i1 and 5i2 are formed on the outer wall portion, and light is emitted to the light emitting element block holding portion 5a and the light receiving element block holding portion 5b of the case body 5. The element unit 11 and the light receiving element unit 13 are inserted in the direction indicated by the arrows. And as shown in FIG. 11, the shield parts 5i1 and 5i2 are formed by bending the board member provided in the outer wall part.

Since the light emitting element unit 11 and the light receiving element unit 13 can be inserted from one direction with respect to the light emitting element block holding part 5a and the light receiving element block holding part 5b, the shield part 5i1 is bent in advance, After inserting the light emitting element unit 11 and the light receiving element unit 13, only the one shield part 5i2 can be bent to complete the photodetecting device 30 shown in FIG.
With the above configuration, the light detection device 30 can provide the light detection device 30 free from noise disturbance because the light emitting element 1a of the light emitting element block 1 and the light receiving element 3a of the light receiving element block 3 are shielded by the shield portions 5i1 and 5i2.

(Fourth embodiment)
Next, the photodetecting device 40 according to the fourth embodiment of the present invention will be described with reference to FIGS. 12 is a completed perspective view of the photodetecting device 40, and FIG. 13 is a cross-sectional view of the photodetecting device 40 attached to the measuring device 50.
The light detection device 40 shown in FIG. 12 corresponds to the basic structure of the light detection device 10 in the first embodiment shown in FIG. 4, and the mounting structure to the measurement device 50 shown in FIG. 13 is the measurement shown in FIG. Since it corresponds to the attachment configuration to the device 50, the same number is assigned to the same member, and the duplicate description is omitted.

  In FIG. 12, the light detection device 40 is different from the light detection device 10 in FIG. 4 on the outer wall portion constituting the light emitting element block holding portion 5a and the light receiving element block holding portion 5b in the case body 5. The positioning projection 5j is provided on the positioning portion 5k and the bottom portion 5g of the case body 5.

Next, assembly of the light detection device 40 and detection operation will be described with reference to FIG.
FIG. 13 is a cross-sectional view of the state in which the light detection device 40 is attached to the measurement device 50. The positioning protrusion 5j is fitted into a positioning recess 51c provided on the mother board 51 of the measuring device 50 for positioning, and the connection electrodes 6b, 6c of the light emitting element holding substrate 6 and the connection electrodes 7b, 7c of the light receiving element holding substrate 7 are measured. The connection electrodes 51 a and 51 b formed on the upper surface of the board 51 of the device 50 are fixed by means such as soldering with solder 52. The operation of the photodetector 40 in this state is the same as the operation of the photodetector 10 shown in FIG.

  As described above, in the light detection device of the present invention, even when the shape or size of the object to be detected changes, the lengths of the light emitting wall 5c and the light receiving wall 5d are adjusted in the drawing process of the case body 5, and By adjusting the lengths of the light-emitting element holding substrate 6 and the light-receiving element holding substrate 7, it is possible to cope without changing the configurations of the light-emitting element block 1 and the light-receiving element block 3.

DESCRIPTION OF SYMBOLS 1, 101,201 Light emitting element block 1a Light emitting element 1b, 3b Wire 1c, 3c Transparent resin 2, 102, 202 Light emitting element substrate 2a, 2b, 4a, 4b Element electrode 3, 103, 203 Light receiving element block 3a Light receiving element 4, 104 light receiving element substrate 5, 205 case body 5a, 205a light emitting element block holding part 5b, 205b light receiving element block holding part 5c light emitting wall 5d light receiving wall 5e light emitting window 5f light receiving window 5g bottom part 5h omission prevention part 5i1, 5i2 shield part 5k positioning Part 5j Positioning projection 6 Light emitting element holding substrate 6a, 7a Notch 6b, 6c, 7b, 7c, 51a, 51b Connection electrode 7 Light receiving element holding substrate 9, 109, 209 Detected object passing part 10, 20, 30, 40 , 100, 200 Photodetector 11 Light emitting element unit 13 Light receiving element Unit 50 measuring device 51 motherboards 51a, 51b connecting electrode 51c positioning recess 52 solder

Claims (6)

  In a light detection device for detecting the presence or absence of an object to be detected by opposingly arranging a light emitting element and a light receiving element, a light emitting wall and a light receiving wall which are coupled by a bottom and arranged to face each other with a predetermined interval, and the light emitting wall And a light emitting window and a light receiving window provided at positions opposite to the light receiving wall, a substantially U-shaped light emitting element block holding portion and a case body provided with the light receiving element block holding portion respectively provided on the light emitting wall and the light receiving wall; A light-emitting element holding substrate having a light-emitting element block mounted on the light-emitting element substrate, a light-receiving element block mounted on the light-receiving element substrate, and a notch for housing the light-emitting element block and the light-receiving element block; A light-emitting element holding substrate incorporating the light-emitting element block, and a light-receiving element holding substrate incorporating the light-receiving element block. By incorporating the a click holding portion and the light receiving element block holder, the light detecting device and detects the presence or absence of the detected object by rays passing through the light emitting window and the light receiving window.   A connection electrode is provided on the light emitting element substrate and the light receiving element substrate mounting surface side of the light emitting element holding substrate and the light receiving element holding substrate, and the light emitting element block and the light receiving element are formed in the cutout portions of the light emitting element holding substrate and the light receiving element holding substrate. The light detection device according to claim 1, wherein the light emitting element substrate and the element electrode of the light receiving element substrate are connected to connection electrodes of the light emitting element holding substrate and the light receiving element holding substrate in a state where the element block is incorporated.   The light detection device according to claim 1, wherein tip portions of the light emitting element block holding portion and the light receiving element block holding portion in the case body are bent to form the light emitting element substrate and a removal preventing portion of the light receiving element substrate.   4. The light detection device according to claim 1, wherein a shield portion between the light emitting element block and the light receiving element block is formed by bending side wall surfaces of the light emitting element block holding part and the light receiving element block holding part in the case body.   The light detection device according to claim 1, wherein a protrusion for positioning the measurement device is provided on a bottom portion of the case body. The light detection device according to claim 1, wherein the case body is formed of a metal plate member.

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