JP2007234970A - Light receiving apparatus, light receiving and emitting apparatus provided with the light receiving apparatus, optical space transmission device provided with the light receiving apparatus or the light receiving and emitting apparatus, and electronic apparatus provided with the light receiving apparatus or the light receiving and emitting apparatus or the optical space transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light receiving apparatus with a high light receiving quantity and a wide directional angle without being attended with upsizing, a light receiving and emitting apparatus provided with the light receiving apparatus, an optical space transmission device provided with the light receiving apparatus or the light receiving and emitting apparatus, and an electronic apparatus provided with the light receiving apparatus or the light receiving and emitting apparatus or the optical space transmission device. <P>SOLUTION: In the light receiving apparatus 10 wherein a light receiving element 2 is arranged on a board 1, the light receiving element 2 and the board 1 are molded, and a light receiving lens 4 is integrally formed with a mold part 3, the light receiving lens 4 is configured so that a plurality of lens bodies 4a, 4b, 4c, 4d are arranged on a straight line orthogonal to an optical axis R of the light receiving element 2 so as to allow a light receiving region of the light receiving element 2 to collect incident light. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  A light receiving device in which a light receiving element is disposed on a substrate, the light receiving device and the substrate are molded, and a light receiving lens is formed integrally with the mold portion, a light receiving and emitting device including the light receiving device, and the light receiving device Alternatively, the present invention relates to an optical space transmission device including the light receiving and emitting device, the light receiving device or the light receiving and emitting device, or an electronic apparatus including the optical space transmission device.

  7 is a front view of a conventional light receiving device, FIG. 8 is a cross-sectional view taken along line A-A ′ of FIG. 7, and FIG. 9 is a cross-sectional view taken along line B-B ′ of FIG.

  In this light receiving device, a light receiving element 102 is bonded by a conductive adhesive 103 on a lead frame 101 whose main component is iron or the like whose surface is plated with silver or the like, and is further electrically connected to the light receiving element 102. The other lead frame 101 and the electrode on the light receiving element 102 are electrically joined by a bonding wire 104, and then the whole is molded by a thermosetting resin such as epoxy. Further, a hemispherical light receiving lens 106 is molded integrally with the mold part 105.

Such a light receiving device is mounted on a household electrical appliance such as a television or an air conditioner, for example, and receives a signal from a light emitting device mounted on a remote controller for operating the electrical product. The received signal is transmitted from the light receiving device to a circuit of a main body such as an electric product, and a predetermined operation is performed (for example, Patent Document 1).
JP 2004-22932 A

  By the way, the amount of light received by the above-described light receiving device is maximized with respect to the light component incident from the front direction of the light receiving device. Light incident from the front direction of the light receiving device is sufficiently received by the light receiving element, but light incident from a direction other than the front direction of the light receiving device is not sufficiently received by the light receiving element. For this reason, even if the light has the same intensity, the amount of light received from a direction other than the front direction is much smaller than the amount of light received from the front direction. It is not possible to obtain sufficient light receiving sensitivity for light from other directions. That is, the conventional light receiving device has a narrow directivity angle.

  Therefore, as a means for increasing the amount of received light, it is conceivable to increase the diameter of the light receiving lens. However, if the diameter of the light receiving lens is increased, the focal length is increased accordingly, so that the light receiving lens from the light receiving surface of the light receiving element. It becomes necessary to increase the distance to the tip, resulting in an increase in the size of the light receiving device.

  As a means for increasing the amount of received light, a method of increasing the size of the light receiving element such as a photodiode is conceivable, but in this case, the response of the light receiving device is delayed by the amount of increase in the size of the light receiving element. Here, when a reverse bias is applied to the light receiving element, the responsiveness is improved. However, the size of the light receiving element is increased, so that the light receiving device is increased in size.

  As described above, conventionally, when the amount of received light is increased, the light receiving device is increased in size, and as a result, there is a problem that miniaturization of a device or the like on which the light receiving device is mounted is hindered.

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a light receiving device having a high light receiving amount and a wide directivity angle without increasing the size of the device. Also provided are a light receiving / emitting device including the light receiving device, an optical space transmission device including the light receiving device or the light receiving / emitting device, an electronic device including the light receiving device, the light receiving / emitting device, or the optical space transmission device. The purpose is that.

  In order to solve the above-described problems, a light receiving device according to the present invention has a light receiving element disposed on a substrate, the light receiving element and the substrate are molded, and a light receiving lens is integrally formed with the mold part. In the light receiving device, the light receiving lens is configured by arranging a plurality of lens bodies on a straight line orthogonal to the optical axis of the light receiving element so that incident light can be condensed on a light receiving region of the light receiving element. It is characterized by.

  With such a configuration, light incident on the optical axis of the light receiving element can be captured by each lens body and condensed on the light receiving region of the light receiving element. Further, since the light receiving lens is a lens in which a plurality of lens bodies are arranged on a straight line orthogonal to the optical axis of the light receiving element, the directivity angle is wide without increasing the size of the light receiving lens.

  Furthermore, according to the above-described light receiving device according to the present invention, the distance between the apexes of adjacent lens bodies may be set narrower than the light receiving width of the light receiving element. The light receiving width refers to a dimension in a direction along the arrangement direction of the lens bodies of the light receiving element. When the distance between the apexes of adjacent lens bodies is made narrower than the light receiving width of the light receiving element, the undulation at the center of the light receiving lens becomes small accordingly. As a result, the light incident on the central portion of the light receiving lens is collected almost perpendicularly to the light receiving element, and a higher light receiving amount can be obtained with respect to the light incident from the front direction of the light receiving device.

  Further, the light receiving lens may be configured such that the apexes of the lens bodies located at both ends are located on the boundary line between the lens bodies adjacent to the inner sides of the lens bodies located at both ends.

  According to such a configuration, since the light incident on each lens body is refracted in the light collecting direction of the light receiving region of the light receiving element, the light incident on each lens body easily reaches the light receiving region of the light receiving element, A higher received light amount can be obtained. That is, contrary to the above configuration, the light receiving lens is configured such that the apexes of the lens bodies located at both ends are located outside the boundary line between the lens bodies adjacent to the inner sides of the lens bodies located at both ends. Then, out of the light incident on the lens bodies located at both ends, the light incident on each inner side of the vertexes of the lens bodies located at both ends is opposite to the light collecting direction of the light receiving region of the light receiving element. The light is refracted in the direction and hardly reaches the light receiving region of the light receiving element.

  In the present invention, the diameter of at least one lens body among the plurality of lens bodies constituting the light receiving lens may be different from the diameters of the other lens bodies.

  In this way, a large amount of weak light that cannot be captured by a single lens body can be captured by the adjacent lens body having a large diameter, and thus a higher received light amount can be obtained.

  In the present invention, the lens body constituting the light receiving lens may be a spherical lens or an aspherical lens.

  If the lens body is a spherical lens in this way, the overall design of the light receiving lens becomes simple. On the other hand, when the lens body is an aspherical lens, more light can be received compared to the case of a spherical lens even if the number of lens bodies constituting the light receiving lens is small.

  In the present invention, the peripheral surface of the mold part may be an inclined surface that gradually widens from the periphery of the light receiving lens toward the light receiving element.

  With such a configuration, the light incident from the direction other than the front direction of the light receiving device can be condensed on the light receiving region of the light receiving element by the mold part in addition to the light receiving lens, and thus the directivity angle is It will be wider.

  The light emitting / receiving device according to the present invention includes the above-described light receiving device according to the present invention, a light emitting element disposed together with the light receiving element on a substrate of the light receiving device, and the light receiving element at a position facing the light emitting element. And a light-emitting lens formed integrally with the mold part of the apparatus.

  The light receiving / emitting device having such a configuration has a smaller outer size than the light receiving / emitting device in which the light receiving device and the light emitting device are separately molded because the light receiving device and the light emitting device are housed in the same mold package. It becomes.

  An optical space transmission device according to the present invention is formed by covering a light receiving device or a light receiving and emitting device according to the present invention with a shield case.

  Furthermore, the shield case of the optical space transmission device may be made of metal or conductive resin.

  In this way, when a shield case made of conductive resin is used, the shield case can be formed during the molding process of the light emitting / receiving device in the manufacturing process of this optical space transmission device, so a metal shield case is used. In this case, the necessary shield case mounting step can be omitted.

  An electronic apparatus according to the present invention is equipped with the above-described light receiving device according to the present invention, the above-described light receiving / emitting device according to the present invention, or the above-described optical space transmission device according to the present invention.

  Thereby, long distance reception, long distance communication, reception and communication with a wide viewing angle are possible without increasing the size of the apparatus.

  According to the present invention, it is possible to provide a light receiving device having a large amount of received light and a wide directivity angle without increasing the size of the device.

  Therefore, the light receiving / emitting device including the light receiving device, the light receiving device, or the optical space transmission device including the light receiving / emitting device can be mounted on an electronic device having a size limitation. For this reason, the electronic device equipped with the light receiving device, the light emitting / receiving device, and the optical space transmission device according to the present invention can perform long-distance reception and long-distance communication without increasing the size of the device, or can have a wide viewing angle. You can receive and communicate.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view of a light receiving device according to an embodiment of the present invention, FIG. 2 is a partial front sectional view of the light receiving device according to the embodiment of the present invention shown in FIG. 1, and FIG. It is a fragmentary front sectional view of the photo acceptance unit concerning an embodiment.

  As shown in FIGS. 1 to 3, a light receiving device 10 according to the present invention includes a lead frame 1, a light receiving element 2 disposed on the lead frame 1, a base end portion of the lead frame 1, and the entire light receiving element 2. And a light receiving lens 4 molded integrally with the mold part 3.

  An embodiment of a method for manufacturing such a light receiving device 10 will be described with reference to a flowchart shown in FIG.

  A metal plate made of iron, copper, or an alloy having high conductivity is patterned by a stamping method or an etching method, and its surface is processed by silver plating or the like. Die bonding is performed with a conductive adhesive as a main component (die bonding step). Subsequently, the other lead frame 1 that is not electrically joined and the electrode on the light receiving element 2 are electrically joined by a bonding wire (not shown) mainly composed of gold or the like (wire bonding step). . Further, the base portion of the lead frame 1, the light receiving element 2, and the bonding wire are sealed with a thermosetting resin such as epoxy to form the mold portion 3 (resin molding step). At this time, the light receiving lens 4 is formed integrally with the mold part 3 with the same thermosetting resin. Further, after performing tie bar cutting and lead cutting (lead cutting process), the light receiving device 10 as shown in FIGS. 1 to 3 is completed through a forming process.

  Instead of the lead frame 1, a substrate formed by performing plating with gold, nickel or the like on the surface of a printed wiring board on which a pattern is formed with copper may be used. The manufacturing process when such a substrate is used also proceeds in the same process as when the lead frame is used until the molding process, and the dicing is performed after the molding process.

  Next, the structure of the light receiving device 10 according to the present invention will be described in detail below.

  The light-receiving lens 4 of the light-receiving device 10 according to the present invention includes a plurality of lens bodies 4a and 4b so that incident light can be condensed on the light-receiving region of the light-receiving element 2 (the entire upper surface of the light-receiving element 2 in FIGS. 2 and 3). , 4c, 4d are arranged on a straight line orthogonal to the optical axis R of the light receiving element 2 (see FIGS. 2 and 3).

  The light-receiving lens 4 of the light-receiving device 10 according to the present embodiment shown in FIGS. 1 to 3 includes four lens bodies 4a, 4b, 4c, and 4d, and these four lens bodies 4a, 4b, 4c, and 4d. Are arranged on a straight line perpendicular to the optical axis R of the light receiving element 2 so that incident light can be condensed on the light receiving region of the light receiving element 2.

  Light incident on the light receiving lens 4 (indicated by a plurality of arrows in the figure) passes through the plurality of lens bodies 4 a, 4 b, 4 c, 4 d and is collected on the light receiving element 2. The two lens bodies 4 b and 4 c located on the center side of the light receiving lens 4 condense light incident mainly from the front direction of the light receiving device 10 in the light receiving region of the light receiving element 2. The lens bodies 4 a and 4 d located at both ends of the light receiving lens 4 condense light incident mainly from directions other than the front direction of the light receiving device 10 in the light receiving region of the light receiving element 2.

  As described above, the light receiving lens 4 of the light receiving device 10 according to the present invention converts the light incident on the optical axis R of the light receiving element 2 into four lens bodies 4a and 4b according to the incident angle with respect to the optical axis R. , 4c, and 4d and condensed on the light receiving region of the light receiving element 2.

  In the conventional light receiving device (see FIGS. 8 to 9) in which the light receiving lens is formed of one lens body, the diameter of the lens body constituting the light receiving lens is increased in order to obtain a wide directivity angle. The distance became longer and the size of the photo detector increased. However, since the light receiving lens 4 of the present invention has a plurality of lens bodies 4a, 4b, 4c, and 4d arranged on a straight line orthogonal to the optical axis R of the light receiving element 2, the size of the light receiving lens 2 can be increased. It is possible to widen the directivity angle without accompanying.

Further, in the light receiving device 10 described above, the distance h ₀ between the apexes of the plurality of lens bodies 4a, 4b, 4c, 4d constituting the light receiving lens 4 is made narrower than the light receiving width h ₁ (see FIGS. 2 and 3). ). The light receiving width refers to the dimension of the light receiving element 2 in the direction along the arrangement direction of the lens bodies 4a, 4b, 4c, 4d. When the distance between the apexes h ₀ of the adjacent lens bodies 4 a, 4 b, 4 c, 4 d is made narrower than the light receiving width h ₁ of the light receiving element 2, the undulation at the central portion of the light receiving lens 4 is accompanied accordingly. It becomes a small one (see FIGS. 2 and 3). As a result, the light incident on the central portion of the light receiving lens 4 is condensed almost perpendicularly to the light receiving element 2, and a higher light receiving amount can be obtained with respect to the light incident from the front direction of the light receiving device 10. it can.

For example, in the light receiving device 10 shown in FIGS. 2 and 3 in which the distance h ₀ between the vertices of the lens body is smaller than the light receiving width h ₁ , the light is incident on the center of the light receiving lens 4 from the front of the optical axis R of the light receiving element 2. The transmitted light passes through the two lens bodies 4b and 4c constituting the central portion thereof, and is condensed perpendicularly to the light receiving region of the light receiving element 2. Therefore, a higher received light amount can be obtained as compared with a light receiving device having a light receiving lens in which the distance h ₀ between the apexes of the lens bodies is larger than the light receiving width h ₁ .

  In addition, the conventional light receiving device is designed so that the light receiving element is positioned at the focal position of the light receiving lens. However, the light receiving device 10 described above is closer to the light receiving lens 4 than the focal position of the light receiving lens 4. May be arranged. This makes it possible to receive a larger amount of light without increasing the package size as much as possible.

Further, in the light receiving device 10 described above, as shown in FIG. 2, in the light receiving lens 4, the apexes Pa and Pd of the lens bodies 4a and 4d located at both ends are inside the lens bodies 4a and 4d located at both ends. lens body 4b adjacent to, and to be positioned on the boundary line L _1, L ₂ and 4c.

In this way, the vertexes Pa and Pd of the lens bodies 4a and 4d located at both ends are on the boundary lines L ₁ and L ₂ with the lens bodies 4b and 4c adjacent to the inner sides of the lens bodies 4a and 4d located at both ends. If the light receiving lens 4 is configured so as to be positioned at, the light incident on each lens body is refracted in the light collecting direction of the light receiving region of the light receiving element 2, so that the light 4 a, 4 b, incident on each lens body 4c and 4d can easily reach the light receiving region of the light receiving element 2, and a higher light receiving amount can be obtained. That is, contrary to the above configuration, as shown in FIG. 3, the apexes Pa and Pd of the lens bodies 4a and 4d located at both ends are adjacent to the inner sides of the lens bodies 4a and 4d located at both ends. , 4c, when the light receiving lens 4 is configured to be located outside the boundary lines L ₁ and L ₂ , out of the light incident on the lens bodies 4a and 4d located at both ends, the lenses located at both ends The light incident on the positions closer to the inside than the vertices Pa and Pd of the bodies 4a and 4d is refracted in a direction opposite to the light collection direction of the light receiving region of the light receiving element 2, and reaches the light receiving region of the light receiving element 2. hard.

In the light receiving device 10 having the configuration shown in FIG. 2, the boundary lines L ₁ and L ₂ may be expanded from the light receiving element 2 toward the light source. In this way, the light incident on each of the lens bodies 4a, 4b, 4c, and 4d is transmitted through only the incident lens body without being blocked by the lens bodies other than the incident lens body, and the light receiving region of the light receiving element 2 It is focused on.

Furthermore, in the light receiving device 10 according to the present invention, the diameter of at least one lens body among the plurality of lens bodies 4a, 4b, 4c, and 4d may be different from the diameters of the other lens bodies.
As described above, when the diameter of at least one lens body among the lens bodies 4a, 4b, 4c, and 4d constituting the light receiving lens 4 is made different from the diameter of the other lens bodies, it is captured by the curved surface of one lens body. A large amount of weak light that cannot be captured can be captured by the curved surface of the lens body having a large diameter and condensed on the light receiving element 2. For example, of the four lens bodies 4a, 4b, 4c, and 4d shown in FIG. 2, the two lens bodies 4b that are located on the inner side of the diameters of the two lens bodies 4a and 4d that are located outside the center of the light receiving element 2 are used. , 4c may be longer than the diameter. In this way, a large amount of weak light coming from the side surface direction of the light receiving device 10 can be collected by the lens bodies 4 a and 4 d constituting both ends of the light receiving lens 4 having a large diameter and condensed on the light receiving element 2.

  Each lens body 4a, 4b, 4c, 4d may be a spherical lens or an aspherical lens.

  When the lens bodies 4a, 4b, 4c, and 4d are thus spherical lenses, the design of the entire light receiving lens 4 is simplified. On the other hand, when the lens bodies 4a, 4b, 4c, and 4d are aspherical lenses, even if the number of lens bodies constituting the light receiving lens 4 is small, more light can be received as compared with the case of using a spherical lens. it can.

  Furthermore, in the above-described light receiving device 10, as shown in FIG. 2, the peripheral surface of the mold part 3 is an inclined surface that gradually spreads from the periphery of the light receiving lens 4 toward the light receiving element 2.

  With such a configuration, light incident from a direction other than the front direction of the light receiving device 10 can be condensed on the light receiving region of the light receiving element 2 by the mold unit 3 in addition to the light receiving lens 4. The directional angle is wider.

  FIG. 5 shows an embodiment of a light receiving / emitting device including the light receiving device 10 and the light emitting device according to the present invention in one mold package. As shown in FIG. 5, in the light receiving and emitting device 20, the light emitting element 5, the light receiving element 2, and the integrated circuit element 7 are mounted on the same substrate 1, and these are entirely molded 3 with an epoxy resin or the like. The light emitting lens 6 is opposed to the light emitting element 5, and the light receiving lens 4 is opposed to the light receiving element 2. The light-receiving lens 4 is the same light-receiving lens 4 as the light-receiving device 10 according to the present invention shown in FIG. 2 described above, and a plurality of lens bodies 4 a and 4 b so that incident light can be condensed on the light-receiving region of the light-receiving element 2. , 4c, 4d are arranged on a straight line orthogonal to the optical axis R of the light receiving element 2.

  Here, the light receiving element 2, the light emitting element 5, and the integrated circuit element 7 are die-bonded on a conductive pattern formed on the substrate 1 with a conductive adhesive mainly composed of silver. The electrodes of the element 2 and the integrated circuit element 7 are connected to the electrodes of the substrate 1 through bonding wires 8 mainly composed of gold or the like (see FIG. 5).

  In addition, an optical space transmission device having a light receiving / emitting function may be provided with the light receiving device 10 or the light receiving / emitting device 20 according to the present invention, and an optical space in which the light receiving / emitting device 20 described above is covered with a shield case 30 in FIG. 1 illustrates one embodiment of a transmission device 40. The shield case 30 is provided to suppress the influence and malfunction due to noise, and either metal or conductive resin may be used. However, when the shield case 30 made of conductive resin is used. In the manufacturing process of the optical space transmission device 40, since the shield case 30 can be formed at the same time as the molding process in the light receiving and emitting device 20, the mounting of the shield case 30 required when the metal shield case 30 is used. The number of processes can be reduced.

  A device such as a television in which the light receiving device 10, the light receiving and emitting device 20, or the optical space transmission device 40 according to the present invention is mounted has a wide directivity angle and can perform long-distance communication. Communication with a mobile phone equipped with the spatial transmission device 40 is possible. Therefore, not only can the mobile phone be used as a remote control function of the television, but also data stored in the mobile phone, such as photo data, can be transmitted and displayed on the television. Moreover, since the light receiving device 10, the light emitting / receiving device 20, and the optical space transmission device 40 according to the present invention have a wide directivity angle, they can receive signals transmitted from directions other than the front of the device.

1 is a perspective view showing an embodiment of a light receiving device according to the present invention. It is a partial front sectional view of the light receiving device shown in FIG. It is a fragmentary front sectional view which shows other embodiment of the light-receiving device based on this invention. It is a flowchart which shows the manufacturing process of the light-receiving device based on this invention. It is a partial front sectional view showing one embodiment of a light receiving and emitting device provided with a light receiving device according to the present invention. It is a perspective view which shows one Embodiment when the light receiving / emitting device provided with the light-receiving device based on this invention is covered with a shield case, and it is set as an optical space transmission device. It is a front view which shows the conventional light-receiving device. FIG. 8 is a cross-sectional view taken along line A-A ′ shown in FIG. 7. It is sectional drawing which follows the B-B 'line shown in FIG.

Explanation of symbols

1 Lead frame (substrate)
2 Light receiving element 3 Mold part 4 Light receiving lens 4a, 4b, 4c, 4d Lens body 5 Light emitting element 6 Light emitting lens 7 Integrated circuit element 8 Bonding wire 10 Light receiving device 20 Light receiving / emitting device 30 Shield case 40 Optical space transmission device R Light receiving element Optical axis h ₀ Distance between vertexes of lens body h ₁ Light receiving width Pa, Pd Each vertex of lens body at both ends

Claims (12)

In the light receiving device in which the light receiving element is disposed on the substrate, the light receiving element and the substrate are molded, and the light receiving lens is integrally formed with the mold part.
The light receiving lens is configured by arranging a plurality of lens bodies on a straight line orthogonal to the optical axis of the light receiving element so that incident light can be condensed on a light receiving region of the light receiving element. Light receiving device.   The light receiving device according to claim 1, wherein a distance between apexes of adjacent lens bodies is set to be narrower than a light receiving width of the light receiving element.   3. The light receiving lens is configured such that the apexes of the lens bodies located at both ends are located on a boundary line between adjacent lens bodies inside the lens bodies located at both ends. The light receiving device described in 1.   The diameter of at least one lens body among the plurality of lens bodies constituting the light receiving lens is different from the diameter of other lens bodies. The light receiving device described.   The light receiving device according to claim 1, wherein the lens body constituting the light receiving lens is a spherical lens or an aspherical lens.   6. The light receiving device according to claim 1, wherein a peripheral surface of the mold part is an inclined surface that gradually expands from a peripheral edge of the light receiving lens toward the light receiving element. .   A light receiving device according to any one of claims 1 to 6, a light emitting element disposed together with the light receiving element on a substrate of the light receiving device, and a position of the light receiving device at a position facing the light emitting element. A light emitting and receiving device comprising a light emitting lens formed integrally with the mold part.   An optical space transmission device comprising a light receiving device according to claim 1 or a light receiving and emitting device according to claim 7 and a shield case.   The optical space transmission device according to claim 8, wherein the shield case is made of a conductive resin.   The electronic device carrying the light-receiving device as described in any one of Claims 1 thru | or 6.   An electronic apparatus equipped with the light emitting and receiving device according to claim 7.   An electronic apparatus equipped with the space optical transmission device according to claim 8.

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