Optical component and optical module using the same

Abstract

To provide a configuration for reducing the size of optical components used in optical communication and obtaining stability in mounting.SOLUTION: An optical component 10 comprises a rectangular parallelepiped transparent body 110 of which a ratio of height to width in a plane orthogonal to an optical axis OA is greater than one; and a lens 15 provided only on a light emission side of the light emission side and a light incident side of the transparent body 110. A lens body 100 formed of the transparent body 110 and the lens 15 comprises: a flat rear surface formed on the light incident side opposite the lens 15; a first surface 115 including a flat contact surface; a second surface 125 including a flat surface opposite the first surface 115; a first extension part 111 protruding continuously from the first surface 115 only to the lens side in an optical axis direction; and a second extension part 121 protruding continuously from the second surface 125 only to the lens side in the optical axis direction.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an optical component and an optical module using the same. [Background technology]

[0002] With the spread of IoT (Internet of Things) and cloud services, the amount of communication over optical networks is increasing rapidly, and there is a demand for further improvements in communication speed and quality. At the same time, the demand for miniaturization of optical communication equipment is driving demand for miniaturization and high density for the individual optical and optoelectronic components incorporated into communication modules.

[0003] A configuration is known in which protrusions are formed on the four corners of a square lens used in optical communications or the like, thereby increasing the area of ​​the lens mounting surface and strengthening the adhesive fixation of the lens when installed (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5074017 Summary of the Invention [Problem to be solved by the invention]

[0005] Modules equipped with optical components for optical communications are becoming smaller and more multi-channel. In optical transceivers in which multiple channels are arranged in parallel, the spacing between the channels is narrow, so the width of the optical components used in each channel needs to be smaller than their height.

[0006] As optical components become smaller in general, a narrower beam is required, and lenses with a shorter focal length are also required. As a result, lenses must be made thinner in the optical axis direction as well. Vertically elongated lenses with reduced width and thickness are unstable and tend to tilt and fall over.

[0007] An object of the present invention is to provide a configuration that reduces the size of optical components used in optical communications and ensures stability when mounted. [Means for solving the problem]

[0008] In one aspect of the present disclosure, the optical component comprises: a rectangular transparent body having a ratio of height to width greater than 1 in a plane perpendicular to the optical axis; a lens provided on at least one of a light exit side and a light incident side of the transparent body; having a lens body formed by the transparent body and the lens has a first surface including a flat contact surface; A perpendicular line drawn from the center of gravity of the lens body to the contact surface coincides with a line segment connecting the center of the contact surface and the center of gravity within a predetermined range. Effect of the Invention

[0009] The above-mentioned configuration allows the optical components used in optical communications to be miniaturized and improves the stability of the optical components when mounted. The size of an optical module using these optical components is also reduced, and the operational reliability is improved. [Brief description of the drawings]

[0010] [Figure 1] 1A and 1B are diagrams illustrating problems with vertical lenses. [Diagram 2] 1 is a schematic diagram of a transmitter including an optical module using an optical component according to an embodiment. [Diagram 3] FIG. 2 is a diagram showing an optical component according to the first embodiment. [Figure 4] FIG. 4 is a diagram illustrating parameters of the optical component according to the first embodiment. [Diagram 5] 5A to 5C are diagrams illustrating an example of the configuration of an extension portion of a lens body. [Figure 6] 1A to 1C are diagrams illustrating a comparison between the optical component of the first embodiment and a general optical component. [Figure 7] FIG. 5 is a schematic diagram of an optical component according to a second embodiment. [Figure 8]FIG. 13 is a schematic diagram of an optical component according to a third embodiment. [Figure 9] FIG. 13 is a schematic diagram of an optical component according to a fourth embodiment. [Figure 10] FIG. 13 is a schematic diagram of an optical component according to a fifth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Before describing the configuration of the embodiment in detail, the technical problems in a vertical lens with reduced thickness will be described in more detail with reference to FIG.

[0012] Figure 1 is a side view of a typical lens used as an optical component. (A) in Figure 1 is a schematic diagram seen from a vertical cross section, and (B) is a light path diagram including the optical axis OA and the center of gravity of the lens. The center of gravity of the lens is indicated by a cross mark. The direction in which light travels is the X direction, the height direction of the lens is the Z direction, and the direction perpendicular to the X and Z directions is the Y direction.

[0013] The lens has a bottom part A, an upper part B, and a lens part LN. When mounting the lens on a substrate or the like, the lens is picked up at the upper part B, carried to the mounting position, and fixed to the mounting position at the bottom part A. The lens part LN is a convex lens in this example, and collimates the incident laser light at the mounting position.

[0014] When the lens thickness is reduced overall to reduce size, the center of gravity of the lens shifts forward along the optical axis OA, that is, toward the light output side. In FIG. 1B, the center of gravity of the lens indicated by the cross mark is shifted in the +X direction from the perpendicular line Lper from the center C1 of the bottom A to the optical axis OA.

[0015] In other words, the line segment connecting the center C1 of the bottom A and the center of gravity of the lens is tilted forward (in the +X direction) by the angle θoff from the perpendicular line Lper. As a result, as shown by the white arrow in the figure, the lens is likely to fall forward (in the +X direction) in the thickness direction. If the lens has a lens part on the back surface of the lens, that is, on the side where the laser light enters, the lens is likely to fall backward (in the -X direction) depending on the position of the center of gravity of the lens.

[0016] If the lens width (size in the Y direction) is narrowed in addition to the lens thickness to reduce size, the fixing area of ​​the bottom A becomes smaller, making it difficult for the lens to stand on its own when mounted. If the center of gravity of the lens is misaligned, there is a risk that the lens will be fixed at an angle.

[0017] If the area of ​​the top surface of the upper portion B becomes smaller, it becomes difficult to stably pick up or hold the lens. When using vacuum suction, the suction force acting on the top surface of the lens becomes weaker, and there is a risk that the lens will fall off during movement.

[0018] In the embodiment, a configuration is provided that solves at least some of the problems described above and enables a rectangular parallelepiped lens with reduced thickness and width to be stably mounted.

[0019] 2 is a schematic diagram of an optical transmitter 1 to which an optical component 10 of an embodiment is applied. The optical transmitter 1 has a digital signal processor (DSP) 2, an optical module 5, and a multiplexer 6. The optical module 5 is a front-end module for optical transmission, and is formed as a four-channel optical transmission module in this example. The solid arrows represent electrical signals, and the dashed arrows represent optical signals.

[0020] The optical module 5 has a driver circuit DRV provided for each channel, a laser diode (LD) as a light source, and an optical component 10. The driver circuit DRV generates a drive signal for driving the LD based on a modulated data signal generated by the DSP 2. In each channel, the LD is designed for different wavelengths λ0 to λ3, and outputs a modulated optical signal according to the input drive signal.

[0021] Optical components 10-1 to 10-4 are arranged corresponding to the multiple LDs, respectively. If there is a strong demand for miniaturization of the optical module 5, it is preferable that the optical components 10-1 to 10-4 are arranged individually rather than integrated into an array. This is because the optical loss can be minimized in a small space by individually adjusting the positions and orientations of the optical components 10-1 to 10-4 according to the placement accuracy of the LDs.

[0022] The light of each wavelength collimated or focused by the optical components 10-1 to 10-4 is multiplexed by the multiplexer 6. The light multiplexed by the multiplexer 6 is input to, for example, an optical fiber and transmitted to a server or the like in a data center.

[0023] In Fig. 2, the optical components 10-1 to 10-4 are depicted diagrammatically as square boxes, but in reality, they have a vertically elongated shape with a reduced width in the channel arrangement direction and a reduced thickness in the optical axis direction. When the positions, orientations, etc. of the optical components 10-1 to 10-4 having such shapes are individually adjusted inside the optical module 5, the optical component 10 itself needs to be stable. In the following embodiment, the configuration of small and stable optical components will be described.

[0024] First Embodiment Fig. 3 shows an optical component 10 of the first embodiment. Fig. 3(A) is a light path diagram, (B) is a front view seen from the light traveling direction (X direction), and (C) is a perspective view. As in Fig. 1, the light traveling direction is the X direction, the height direction of the optical component 10 is the Z direction, and the direction perpendicular to the X direction and Z direction is the Y direction. The Y direction is the direction along the width of the optical component 10.

[0025] The optical component 10 has a vertically elongated transparent body 110 and a lens 15 provided on at least one of the light exit side and the light entrance side of the transparent body 110. The transparent body 110 and the lens 15 form a lens body 100. The transparent body 110 has a rectangular parallelepiped shape with a ratio of height to width greater than 1 in a plane perpendicular to the optical axis OA. As an example, when the width of the transparent body 110 is set to 0.6 mm or less, the height of the lens body 100 is 1.0 mm.

[0026] The lens body 100 has a bottom 11 and an upper part 12. The bottom 11 has a first surface 115 which is a mounting surface for the optical component 10. The upper part 12 has a second surface 125 located on the opposite side to the first surface 115. When mounting the optical component 10, the upper part 12 is held by vacuum suction, mechanical chucking, or the like, and is carried to a predetermined mounting position. At the mounting position, the position, angle, and the like of the optical component 10 relative to the LD are finely adjusted. When the arrangement and posture of the optical component 10 are determined, the optical component 10 is fixed to a substrate or the like at the first surface 115. More specifically, the optical component 10 is fixed to a substrate or the like at a flat contact surface 115a included in the first surface 115.

[0027] The lens 15 is provided between the bottom 11 and the top 12, and collimates the incident light from the LD into parallel light. Alternatively, the shape of the lens 15 may be adjusted to focus the incident light at a predetermined position. When the width and height of the lens body 100 are set to 0.6 mm×1.0 mm, the radius of the lens 15 is, for example, 0.27 mm to 0.28 mm. When viewed in a vertical cross section along the optical axis OA, the shape of the lens body 100 is asymmetric in the optical axis direction, that is, the cross-sectional shapes of the light exit side and the light entrance side are different.

[0028] An optical component that has a reduced thickness in the optical axis direction and is asymmetric along the optical axis is prone to tipping over due to a shift in the center of gravity in the optical axis direction, as described with reference to Fig. 1. To solve this problem, the optical component 10 of the first embodiment is designed so that the center of gravity (indicated by a cross mark) of the lens body 100 and the center of the contact surface 115a of the optical component 10 are located on the same perpendicular line.

[0029] In a more preferred example, the center of gravity of the lens body 100, the center C1 of the contact surface 115a, and the center C2 of the upper portion 12 are located on the same perpendicular line. The second surface 125 of the upper portion 12 has a flat surface 125a used for vacuum suction or the like. The center of gravity of the lens body 100 is located on a perpendicular line connecting the center C1 of the contact surface 115a of the bottom portion 11 and the center C2 of the flat surface 125a of the upper portion 12.

[0030] In order to ensure the stability of the optical component 10, the lens body 100 may have a first extension portion 111 that protrudes in the optical axis direction from the bottom portion 11. The first extension portion 111 may be formed across the entire width of the bottom portion 11. The amount of protrusion of the first extension portion 111 in the optical axis direction may be uniform across the width. This increases the base area and stabilizes the optical component 10.

[0031] A second extension portion 121 protruding in the optical axis direction may be provided on the upper portion 12 of the lens body 100. The second extension portion 121 may be formed with a constant protruding amount over the entire width direction of the upper portion 12. This increases the pickup area when the optical component 10 is transported to the mounting position, and stabilizes the attitude of the optical component 10 during movement.

[0032] FIG. 4 is a diagram for explaining parameters of the optical component 10. This diagram is a vertical cross-sectional view along the optical axis OA of the optical component 10. The lens body 100 has a center of gravity COM on the optical axis OA. The size of the first surface 115 of the bottom portion 11 in the optical axis direction is d12, and the size of the contact surface 115a in the optical axis direction is d11. Preferably, d11 is larger than 1 / 2 of d12. By making d11 larger than 1 / 2 of d12, the mounting stability of the optical component 10 is improved. As an example, when d12 is set to 0.48 mm to 0.50 mm, d11 is 0.33 mm to 0.35 mm.

[0033] 4 shows the ideal shape of the optical component 10, in which the perpendicular line L1 drawn from the center of gravity COM to the contact surface 115a coincides with the line segment L2 connecting the center of gravity COM and the center C1 of the contact surface 115a. In other words, in a vertical cross section along the optical axis OA, the intersection of the perpendicular line Lper (see FIG. 1) extending from the center C1 of the contact surface 115a to the optical axis OA and the optical axis OA coincides with the center of gravity COM.

[0034] The angle that the line connecting the center of gravity COM and the rear end 116 of the contact surface 115a makes with the perpendicular line L1 is defined as the inclination angle θa. The inclination angle θa correlates with the force acting from the surface on which the optical component 10 is mounted toward the front (+X side) of the lens body 100.

[0035] The angle that the line connecting the center of gravity COM and the front end 117 of the contact surface 115a makes with the perpendicular line L1 is defined as the inclination angle θb. The inclination angle θb correlates with the force acting from the surface on which the optical component 10 is mounted toward the rear (−X side) of the lens body 100.

[0036] In FIG. 4, the balance is achieved at θa=θb, and the optical component 10 is stable by itself. More preferably, the extensions of L1 and L2 pass through the center C2 of the flat surface 125a of the upper portion 12. The optical component 10 is not necessarily limited to this ideal shape. The perpendicular line L1 and the line segment L2 may deviate to a certain degree within the tolerance range. This will be described later with reference to FIG. 6.

[0037] Fig. 5 shows an example of parameters of the extension portion of the lens body 100. Fig. 5 illustrates the second extension portion 121 of the upper portion 12, but when the upper portion 12 and the bottom portion 11 are formed symmetrically in the up-down direction with respect to the optical axis OA, the parameters in Fig. 5 directly apply to the first extension portion 111 of the bottom portion 11.

[0038] The second extension portion 121 protrudes in the optical axis direction (the +X direction in this example) continuously from the flat surface 125a of the upper portion 12. Similarly, the first extension portion 111 of the bottom portion 11 protrudes in the optical axis direction continuously from the contact surface 115a (see FIG. 4).

[0039] The height h of the second extension portion 121 is set to a height that is unlikely to chip, taking into consideration the overall dimensions of the lens body 100. For example, when the width and height of the lens body 100 are set to 0.6 mm×1.0 mm, it is preferable that the height h of the second extension portion 121 is 0.2 mm or more. The same applies to the height of the first extension portion 111 of the bottom portion 11.

[0040] The second extending portion 121 may have a curved surface 123 continuing from the flat surface 125a, a flat vertical surface 124 continuing from the curved surface 123, and an inclined surface 122 continuing from the vertical surface 124. The flat surface 125a and the curved surface 123 form a second surface 125. A protruding amount d13 of the second extending portion 121 in the X direction may be set to about half the difference between d12 and d11 in FIG. 4. As an example, d13 is 0.07 mm to 0.08 mm.

[0041] The inclination angle θ of the inclined surface 122 from the Z direction is, for example, 40° to 50°, and is set to 45° in the example of FIG. 5. A flat portion 126 may be provided between the second extending portion 121 and the lens 15. The height d15 of the flat portion 126 is about 0.03 mm. By providing the flat portion 126, the lens 15 and the inclined surface 122 are connected at an obtuse angle, and a sharp cut can be prevented. The second extending portion 121 is formed of the curved surface 123, the vertical surface 124, and the inclined surface 122, and the flat portion 126 is provided between the lenses 15, thereby obtaining a shape that is less likely to chip. The same configuration is also applied to the first extending portion 111.

[0042] Fig. 6 shows an example of the configuration of the optical component 10 within the range of the allowable error. The perpendicular line L1 from the center of gravity COM to the contact surface 115a and the line segment L2 connecting the center of gravity COM and the center C1 may be misaligned within a predetermined range. In Fig. 6A, the perpendicular line L1 and the line segment L2 of the optical component 10 are misaligned at an angle of 1°.

[0043] If the deviation angle between the perpendicular line L1 and the line segment L2 is 10% or less of the larger of the inclination angles θa and θb, it is within the permissible range and maintains the stability of the vertically elongated lens body 100. The deviation angle between the perpendicular line L1 and the line segment L2 is approximately half the difference between the inclination angles θa and θb.

[0044] For comparison, (B) of Figure 6 shows the deviation angle in the general lens configuration of Figure 1. The deviation angle between the perpendicular line L1 and the line segment L2 is 2.3°, and the center of gravity COM is tilted forward (X direction). This deviation angle exceeds 10% of the inclination angle θa, and stability is not ensured.

[0045] In optical component 10 of the first embodiment, perpendicular line L1 drawn from center of gravity COM of lens body 100 to contact surface 115a of bottom 11 and line segment L2 connecting center of gravity COM and center C1 of contact surface 115a almost coincide with each other within the range of allowable deviation angles. This allows optical component 10 to stand on its own at the mounting position, and allows stable position adjustment or angle adjustment.

[0046] When the deviation angle between perpendicular line L1 and line segment L2 is within the range of the allowable error, an extension of perpendicular line L1 passes near the center of flat surface 125a of upper portion 12. This stabilizes the posture of optical component 10 when optical component 10 is transported to the mounting position, and optical component 10 can be transported reliably to the mounting position.

[0047] <Second embodiment> 7 is a schematic diagram of an optical component 10A according to a second embodiment, the optical component 10A being shown in a vertical cross section taken along an optical axis OA.

[0048] Optical component 10A has first extension portion 111A and second extension portion 121A on the back surface of lens body 100A, i.e., the light incident side. First extension portion 111A is formed continuously in the -X direction from contact surface 115a of bottom portion 11. Second extension portion 121A is formed continuously in the -X direction from flat surface 125a of top portion 12.

[0049] By providing the first extending portion 111A and the second extending portion 121A on the side opposite the lens 15, the lens body 100A is easily balanced in the optical axis direction and is stable. Since the first extending portion 111A and the second extending portion 121A are provided on the flat back surface opposite the lens 15, the shapes of the first extending portion 111A and the second extending portion 121A are simplified and are less likely to chip.

[0050] A perpendicular line L1 drawn from the center of gravity COM of the lens body 100A to the contact surface 115a and a line segment L2 connecting the center C1 of the contact surface 115a and the center of gravity COM substantially coincide with each other within a predetermined range, as in the first embodiment. In addition, a length d11 of the contact surface 115a in the optical axis direction is set to be larger than 1 / 2 of a length d12 of the first surface 115 in the optical axis direction.

[0051] By providing the first extension portion 111A and the second extension portion 121A on the rear side of the lens body 100A, the center of gravity COM is shifted toward the rear side of the lens body 100A compared to the first embodiment. The contact surface 115a is disposed slightly forward of the lens body 100A so that a perpendicular line L1 drawn from the center of gravity COM to the contact surface 115a coincides within a predetermined range with a line segment L2 connecting the center C1 of the contact surface 115a and the center of gravity COM.

[0052] In a more preferred configuration example, flat surface 125a of second surface 125 of upper portion 12A is disposed slightly toward the front of lens body 100A, and an extension of perpendicular line L1 passes near the center of flat surface 125a of second surface 125. This configuration makes it easier for optical component 10A to stand on its own at the mounting position, and stabilizes the posture of optical component 10A during transportation to the mounting position, ensuring reliable transportation.

[0053] <Third embodiment> 8 is a schematic diagram of an optical component 10B according to a third embodiment, the optical component 10B being shown in vertical cross section along an optical axis OA.

[0054] In optical component 10B, extensions are provided on both the light emission side (+X direction) and the light incidence side (-X direction) of lens body 100B. In bottom 11B, extension 111Ba on the light emission side and extension 111Bb on the light incidence side form a first extension. In top 12B, extension 121Ba on the light emission side and extension 121Bb on the light incidence side form a second extension.

[0055] The extensions 111Ba and 121Ba on the light emission side are formed in a shape that does not interfere with the lens 15 and does not include acute angles, making them less likely to chip. The extensions 111Bb and 121Bb on the light incidence side are shaped with few irregularities. This configuration is suitable when there is no extra space between the LD and the optical component 10B.

[0056] The amount of protrusion of the extension is distributed between the light exit side and the light entrance side, the contact surface 115a occupies a large proportion of the first surface 115, and the fixing area during mounting is large. The flat surface 125a occupies a large proportion of the second surface 125, and optical component 10B can be held with strong suction force during transportation.

[0057] As in the first and second embodiments, a perpendicular line L1 drawn from the center of gravity COM of the lens body 100B to the contact surface 115a and a line segment L2 connecting the center of gravity COM and the center C1 of the contact surface 115a approximately coincide with each other within a predetermined range. The optical component 10B can stably stand on its own even in a narrow space in the optical axis direction.

[0058] <Fourth embodiment> 9 is a schematic diagram of an optical component 10C according to a fourth embodiment. The optical component 10C is shown in a vertical cross section along the optical axis OA. In the optical component 10C, the bottom 11C of the lens body 100C has extensions that protrude on both sides along the optical axis, and the top 12C has an extension that protrudes on only one side.

[0059] In the bottom portion 11C, the extending portion 111Ca on the light exit side and the extending portion 111Cb on the light incident side constitute a first extending portion, and in the top portion 12B, the extending portion 121C on the light incident side constitutes a second extending portion.

[0060] The extension 111Ca on the light emission side of the bottom 11C is formed in a shape that does not interfere with the lens 15 and does not include acute angles, making it difficult to chip. The extensions 111Cb and 121C on the light incidence side have shapes with few projections and recesses. This configuration is suitable when there is no extra space between the LD and the optical component 10B.

[0061] At bottom 11C, the amount of protrusion of the extension is distributed between the light exit side and the light entrance side, ensuring a wide contact surface 115a. At top 12C, unevenness in the optical axis direction is minimized. Optical component 10C can stand independently stably even in a narrow space in the optical axis direction.

[0062] As in the first to third embodiments, a perpendicular line L1 drawn from the center of gravity COM of the lens body 100C to the contact surface 115a and a line segment L2 connecting the center C1 of the contact surface 115a and the center of gravity COM substantially coincide with each other within a predetermined range. By designing the extension line of the perpendicular line L1 to pass through the center or its vicinity of the flat surface 125a of the upper portion 12C, the optical component 10C can be transported in a stable posture even if the lens body 100C is not vertically symmetrical with respect to the optical axis OA.

[0063] <Fifth embodiment> FIG. 10 is a schematic diagram of an optical component 10D of the fifth embodiment. The optical component 10D is shown in a vertical cross section along the optical axis OA. In the optical component 10D, only the bottom portion 11D has a first extension portion 111D. The upper portion 12D does not have any unevenness in the optical axis direction. This configuration is suitable for gripping by the mechanical chucking 20. The optical component 10D can be securely gripped by the flat surface on the back surface (light incident side) of the lens body 100D and the flat surface on the front surface (lens side) of the upper portion 12D.

[0064] As in the first to fourth embodiments, a perpendicular line L1 drawn from the center of gravity COM of the lens body 100D to the contact surface 115a and a line segment L2 connecting the center C1 of the contact surface 115a and the center of gravity COM substantially coincide with each other within a predetermined range. The optical component 10D is stable enough to stand on its own, and is easy to process because of its simple shape.

[0065] Although the above description is based on a specific configuration example, the present invention is not limited to the above configuration example. The lens 15 does not need to be disposed only on the light exit side, but may be disposed on the entrance surface, or may be disposed on both the entrance surface and the exit surface. In either case, the lens is configured so that the perpendicular line L1 drawn from the center of gravity of the lens body to the contact surface at the bottom coincides with the line segment L2 connecting the center of the contact surface and the center of gravity within a predetermined range.

[0066] The first to fifth embodiments described above can be combined with each other. For example, in the configuration of Fig. 7 (second embodiment), an extension part that protrudes toward the light exit side (+X direction) may be provided on one or both of the bottom 11A and the top 12A of the lens body 100A. In the bottom 11D of Fig. 10 (fifth embodiment), in addition to the first extension part 111D, an extension part that protrudes toward the light entrance side (-X direction) may be provided to distribute the protrusion amount in the optical axis direction.

[0067] With these configurations, the center of gravity COM of the lens body and the center C1 of the contact surface are aligned on the same perpendicular line L1, which stabilizes the position of the optical component during mounting and prevents tilting or tipping. Furthermore, by locating the center C2 of the upper flat surface on an extension of the perpendicular line L1, the position of the optical component 10 is stabilized when it is transported to the mounting position. Even if the optical component is quickly moved to the mounting position, the gripping by vacuum suction or mechanical chucking is stable. Since the position adjustment of the optical component is stable at the mounting position, the overall assembly time of the optical component 10 can be shortened.

[0068] This international application claims priority to Japanese Patent Application No. 2020-101765, filed on June 11, 2020, and contains the entire contents of that Japanese patent application. [Explanation of symbols]

[0069] 1 Optical transmitter 5 Optical Module 10, 10-1~10-4, 10A~10D Optical components 11, 11A~11D bottom 12, 12A~12D upper part 15 Lenses 100, 100A~100D Lens body 110 Transparent body 111, 111A, 111D 1st extension part 115 Page 1 115a Contact surface 121, 121A, 121C 2nd extension 125 2nd page 125a flat surface COM center of gravity OA optical axis L1 Perpendicular line from the center of gravity to the contact surface L2 Line segment connecting the center of gravity and the center of the contact surface Lper: Perpendicular line from the center of the contact surface to the optical axis direction C1 Center of contact surface C2 Center of flat surface

Claims

1. a rectangular transparent body having a ratio of height to width greater than 1 in a plane perpendicular to the optical axis; a lens provided only on the light exit side of the transparent body out of a light exit side and a light incident side; having The lens body formed by the transparent body and the lens is a flat back surface formed on the light incident side opposite the lens; a first surface including a flat contact surface; A second surface including a flat surface opposite the first surface; a first extension portion that is continuous with the first surface and protrudes only toward the lens in the optical axis direction; a second extension portion that is continuous with the second surface and protrudes only toward the lens in the optical axis direction; having The lens is located between the first extension portion and the second extension portion, The lens body has a flat portion between the lens and the first extension portion and the second extension portion, the first extension portion and the second extension portion protrude toward the lens in the optical axis direction beyond the flat portion, A deviation angle between a perpendicular line drawn from the center of gravity of the lens body to the contact surface and a line segment connecting the center of gravity and the center of the contact surface is within 10% of the larger of an inclination angle between a line connecting the center of gravity and the rear end of the contact surface and the perpendicular line, and an inclination angle between a line connecting the center of gravity and the front end of the contact surface and the perpendicular line. Optical components.

2. a length of the contact surface in the optical axis direction is greater than half a length of the first surface in the optical axis direction; The optical component according to claim 1 .

3. The optical component according to claim 1 , wherein the first extension portion has a curved surface continuing from the first surface, and a flat vertical surface continuing from the curved surface.

4. The optical component according to claim 1 , wherein the second extension portion has a curved surface continuing from the second surface, and a flat vertical surface continuing from the curved surface.

5. The first extension portion is formed across the entire width of the transparent body. The optical component according to claim 1 .

6. A protrusion amount of the first extension portion in the optical axis direction is constant in a width direction of the lens body. The optical component according to claim 5 .

7. The center of the flat surface is located on an extension of the perpendicular line. The optical component according to claim 1 .

8. A light source; The optical component according to any one of claims 1 to 7, which collimates or focuses light emitted from the light source; An optical module having

9. A plurality of said light sources; A plurality of the optical components provided corresponding to the light source; and the position or angle of the optical component relative to the light source is adjusted individually for each of the plurality of optical components.

9. The optical module according to claim 8.

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