Receiving TO-CAN

Abstract

The utility model relates to a receiving TO-CAN, which comprises a base and a pipe cap, a conical positioning step is arranged on the base, a detector chip is fixed at the center of the conical positioning step, a lens is fixed at the center of the pipe cap, and the inner wall surface at the opening end of the pipe cap is a conical positioning surface; the open end of the pipe cap is sleeved on the conical positioning step, and the conical positioning surface on the pipe cap is tightly attached to the conical circumferential surface of the conical positioning step, so that the detector chip and the lens are coaxially coupled. The beneficial effects are that high-precision alignment of the detector chip and the lens is ensured by means of hard contact positioning of the conical positioning step on the base and the conical positioning surface at the open end of the tube cap, and dislocation of the detector chip and the lens can be greatly improved so as to realize high yield.

Description

Technical Field

[0001] The utility model relates to the technical field of optical communication, in particular to a receiving TO-CAN. Background Art

[0002] The step on the base used by the common receiving TO-CAN is designed to be 90°, and the inner wall of the open end of the tube cap is designed to be 90°. The open end of the tube cap is sleeved on the step of the base, and this design must leave a matching gap. The tube cap and the base are usually fixed by resistance welding. The specific assembly method is: use upper and lower electrodes to position the tube cap and the base. Due to the aforementioned matching gap, the lens on the tube cap and the center of the detector chip on the step of the base will deviate after the tube cap and the base are assembled. Although the accuracy of the detector chip patch can be accurate to within 10um, and the lens accuracy can also reach within 10um, due to the design of the tube cap and the base, the final deviation still reaches more than 0.1mm, such as Figure 1 shown.

[0003] As shown in the patent application number 2017110235789, although there is no gap shown between the pipe cap and the base step in the structural drawings disclosed in the patent, the gap does exist in the actual production process, otherwise the pipe cap cannot match the step. Although the gap can be reduced by improving the processing accuracy, due to limited materials and processes, the gap cannot be reduced infinitely, so there must be a deviation in the end.

[0004] In high-speed receiving TO-CAN applications, the photosensitive surface of the detector chip is getting smaller and smaller (the higher the rate, the smaller the photosensitive surface), and the smaller photosensitive surface will lead to a smaller coupling tolerance, so too much misalignment cannot be tolerated. If there are too many errors between the lens and the detector chip, the optical performance will be reduced, and the coupling efficiency will be reduced, affecting the yield. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a receiving TO-CAN to overcome the deficiencies in the above-mentioned prior art.

[0006] The technical solution of the utility model to solve the above technical problems is as follows:

[0007] A receiving TO-CAN comprises: a base and a tube cap, wherein the base is provided with a conical positioning step, a detector chip is fixed at the center of the conical positioning step, a lens is fixed at the center of the tube cap, and the inner wall surface at the open end of the tube cap is a conical positioning surface; the open end of the tube cap is sleeved on the conical positioning step, and the conical positioning surface on the tube cap is tightly attached to the conical circumferential surface of the conical positioning step, so that the detector chip and the lens are coaxially coupled.

[0008] The beneficial effect of the utility model is that the hard contact positioning between the conical positioning step on the base and the conical positioning surface at the opening end of the tube cap ensures high-precision alignment of the detector chip and the lens, which can greatly improve the misalignment of the detector chip and the lens to achieve a high yield.

[0009] On the basis of the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, the height of the tapered positioning surface is smaller than the height of the tapered positioning step.

[0011] Furthermore, the pipe cap and the base are bonded together by glue.

[0012] The above method has the further beneficial effect that the conical positioning surface on the pipe cap and the conical circumferential surface of the conical positioning step are closely fitted together, so that the pipe cap and the base can be bonded together by glue, thereby eliminating the need for a resistance welding positioning fixture, saving costs, and simplifying the process. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of a receiving TO-CAN having a matching gap in the prior art after assembly;

[0014] Figure 2 This is a structural diagram of a TO-CAN receiver in the utility model;

[0015] Figure 3 It is an exploded diagram of the receiving TO-CAN in the utility model.

[0016] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0017] 1. Base, 110, conical positioning step, 2. Tube cap, 210, conical positioning surface, 220, folded edge, 3. Detector chip, 4. Lens. DETAILED DESCRIPTION

[0018] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0019] Example 1

[0020] like Figure 2 , Figure 3 As shown, a receiving TO-CAN includes:

[0021] The base 1 and the tube cap 2, the base 1 has a conical positioning step 110, a detector chip 3 is fixed at the center of the conical positioning step 110, and a lens 4 is fixed at the center of the tube cap 2. The detector chip 3 and the lens 4 are still fixed using existing mature technologies;

[0022] The inner wall surface at the open end of the tube cap 2 is a conical positioning surface 210, and the open end of the tube cap 2 is sleeved on the conical positioning step 110. At this time, the conical positioning surface 210 on the tube cap 2 is in close contact with the conical circumferential surface of the conical positioning step 110, so that the detector chip 3 and the lens 4 are coaxially coupled. The conical positioning step 110 on the base 1 and the conical positioning surface 210 at the open end of the tube cap 2 are hard-contacted and positioned to ensure high-precision alignment of the detector chip 3 and the lens 4, which can greatly improve the misalignment of the detector chip 3 and the lens 4 to achieve a high yield. In addition, the cooperation between the conical positioning step 110 and the conical positioning surface 210 also makes it easy to align and assemble the tube cap 2 and the base 1.

[0023] Example 2

[0024] like Figure 2 , Figure 3 As shown, this embodiment is a further improvement on the basis of embodiment 1, and the details are as follows:

[0025] The height of the conical positioning surface 210 is smaller than the height of the conical positioning step 110. The conical positioning surface 210 on the pipe cap 2 and the conical circumferential surface of the conical positioning step 110 fit tightly together, so that the pipe cap 2 and the base 1 can be bonded together with glue, thereby eliminating the need for a resistance welding positioning fixture, saving costs, and simplifying the process.

[0026] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A receiving TO-CAN, characterized in that, include: A base (1) and a tube cap (2), wherein the base (1) is provided with a conical positioning step (110), a detector chip (3) is fixed at the center of the conical positioning step (110), a lens (4) is fixed at the center of the tube cap (2), and the inner wall surface at the open end of the tube cap (2) is a conical positioning surface (210); the open end of the tube cap (2) is sleeved on the conical positioning step (110), and the conical positioning surface (210) on the tube cap (2) is tightly attached to the conical circumferential surface of the conical positioning step (110), so that the detector chip (3) and the lens (4) are coaxially coupled.

2. A receiving TO-CAN according to claim 1, characterized in that: The height of the conical positioning surface (210) is smaller than the height of the conical positioning step (110).

3. A receiving TO-CAN according to claim 2, characterized in that: The pipe cap (2) and the base (1) are bonded together using glue.

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