JPH11233808A - Semiconductor laser unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To intend the deformation avoidance of outer lead and the simplification of connection work to outer terminals when LD(laser diode) chip and a photodetector are arranged in one package for realizing the reduction of part numbers, the simplification of assembling work, the miniaturization of products, and the cost reduction. SOLUTION: An outer lead protected by the lower step parts 5b of a resin molded part with the existing electric connection parts 9b to the outer terminal effectively avoids the deformation of the outer lead ends, in the cases of cutting lead pins and handling after the fixation and manufacture of an island part 3. In such a constitution, the socket parts 12 wherein the electric connection surfaces 9b of the outer lead are exposed are formed on the protruding parts on the lower surface side, so that the socket parts 12 may be inserted into a continuity tester and a socket loading part, etc., for facilitating the electric connection between respective lead pins and the outer terminals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semiconductor laser unit which is incorporated in an optical disc or various optical devices to constitute a pickup. More specifically, the present invention relates to a laser diode chip (hereinafter, referred to as a "light source") for a hologram type pickup. LD chip) and a semiconductor laser unit in which a light-receiving element for signal reading is arranged in one package.

[0002]

2. Description of the Related Art Recently, music CDs and other CD-ROs have been developed.
In various optical disk systems such as M and MD, a hologram type pickup employing a hologram element (HOE) having functions such as beam generation, light branching, and error signal generation as an optical system has been proposed. This pickup includes a semiconductor laser unit in which an LD chip for a light source and a light receiving element for signal reading are arranged in one package, and a hologram element bonded and fixed to the upper surface of the semiconductor laser unit. Such a hologram-type pickup can achieve various advantages such as reduction in size and weight, reduction in cost, and high-speed access by reducing the number of components and improving environmental resistance performance. FIG. 15 shows a conventional semiconductor laser unit in which a stem (metal) such as Kovar is used as a base (island) 100, an LD chip 101 and a light receiving element 102 are mounted above the base 100, and lead pins 103 for terminals are connected to the base. 100, and set by inserting into a plurality of holes 104 opened in the LD chip 101.
The light receiving element 102 is electrically connected to a predetermined lead pin 103 by wire bonding 105. For optical reasons, the light receiving element 102 is a pedestal 106 projecting from the base 100.
While the LD chip 101 is fixed on the upper surface, the light receiving element 10
2 and is fixed to the side surface of the mounting surface 107 erected on the base 100 so that the laser emission point is directed upward, and the LD chip 101 is substantially perpendicular to the upper surface of the base 100.
The light receiving elements 102 are each maintained substantially horizontal. In this prior art, after the lead pin 103 is inserted into the hole 104 of the base 100, the hole 104 is filled with a glass sealant 108 or the like to fix and insulate the lead pin 103. Therefore, it is natural to narrow the pitch of the lead pin 103. There are limitations,
It is difficult to further reduce the size of the base 100, and a CD-ROM drive for a notebook computer, a music CD, an MD
However, there is a problem that it is not possible to immediately respond to the need for further miniaturization and lightening of optical application equipment such as portable and car-mounted players.

In order to meet such needs, the present applicant has proposed the semiconductor laser units shown in FIGS. 12 to 14 (Japanese Patent Application Nos. 9-8486 and 9-5).
9239). The prior art shown in FIG.
Island 203 as a base having a light receiving element 202 and a light receiving element 202
And a lead frame 205 having a large number of lead pins 204
And a resin mold 206 or a molding resin for fixing and insulating each lead pin 204 with respect to the island 203, and the lead pins 204 forming the periphery of the island 203 are provided.
Are used as electrical connection terminals. Then, the lead pins 103 are inserted into the plurality of holes 104 formed in the island 100, respectively, and further filled with the filler 104 to fix and insulate the lead pins 103, as compared with the above-described conventional technique.
Since the base island 203 can be made as small as possible, further miniaturization can be achieved, and the lead frame 204 can be formed into a single band-shaped metal plate serving as a substrate for multiple products. Also, when performing resin molding and molding resin, a plurality of products can be molded at once or continuously, and the number of parts can be reduced, and high-precision products without variation can be mass-produced.

However, when the prior art shown in FIG. 14 is examined in detail, the inner lead 204a is pulled in from the periphery of the island 203 to fix and insulate the lead pin 204.
This results in a layout that occupies the space for mounting the LD chip 201 and the light receiving element 202 in 203. For this reason, the island 203 must be slightly enlarged to secure the space necessary for mounting the LD chip 201 and the light receiving element 202, and there is still room for development in minimizing the size to the minimum. was there. The inner lead 204a may be bent on the lead frame 205, or the preformed island 203 and the lead frame 20 may be bent.
In addition, the resin mold 206 and the molding resin need to be fixed together by placing both of them in a mold, and the molding is complicated, and there is room for contrivance in providing at low cost.

The prior art shown in FIG. 12 is intended to solve such a problem. An LD chip 301 and a light receiving element 302 are mounted on an island 303 and are electrically connected to the LD chip 301 and the light receiving element 302. Connect the parallel lead pins 304
The pair of left and right resin molded parts 305, 305 are held vertically, and the resin molded part 305 and the island 303 are fixed together to form a single package with the joints fixed together. The LD chip and the light-receiving element are arranged in one package by holding the direction and holding the resin molded portion 305 on the parallel lead pins 304 of the lead frame 306 by resin molding as shown in FIG. Further miniaturization of the semiconductor laser unit is realized at low cost.

[0006]

The prior art shown in FIG. 12 will be further examined.
Although 304 is held in a skewered manner by the resin molding portion 305, the outer lead 304a portion protrudes to the lower surface side of the resin molding portion 305, and when cutting for adjusting the length of the outer lead 304a, When the resin molded portion 305 and the island 303 are fixed, or when the post-manufacturing is handled, the end of the outer lead may be deformed. In addition, this type of semiconductor laser unit is manufactured using a tester (socket)
The continuity test is performed by using a plurality of outer leads 30 protruding from the lower surface of the resin molded portion 305.
The work of connecting the 4a to the contacts of the socket while being careful not to deform the end is forced.When assembling the pickup, it is necessary to connect the lead wires for each outer lead 304a and solder it. This has been a barrier in automating these test operations and pickup assembly operations.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances, and its purpose is to arrange an LD chip and a light receiving element in one package, thereby reducing the number of parts and simplifying the assembling work. An object of the present invention is to prevent the deformation of outer leads and simplify the work of connecting to an external terminal in a semiconductor laser unit that realizes miniaturization, product downsizing, cost reduction, and the like.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method of mounting an LD chip and a light receiving element on an island, and forming parallel lead pins electrically connected to the LD chip and the light receiving element by resin molding. In the semiconductor laser unit in which the resin molded portion and the islands are integrally assembled into one package, the resin molded portion and the island are held together in a vertical direction, and the resin molded portion corresponds to the inner lead and the outer lead with respect to the parallel lead pins. Each lead pin is molded so as to cover each lead pin while leaving an electrical connection surface on the protruding end surface or side surface, and an electrical connection surface of an outer lead of each lead pin is exposed at a portion of the resin molded portion protruding toward the lower surface of the island. The gist is that a socket portion is formed. According to such a configuration, the outer lead
Since the surrounding area is protected by the resin molded part, leaving the electrical connection surface with the external terminal, when cutting to adjust the length of the outer lead, or when fixing the island with the resin molded part, Furthermore, the deformation of the end portion of the outer lead is effectively prevented during handling after manufacturing. In addition, since a socket portion where the electrical connection surface of the outer lead of each lead pin is exposed is formed at a portion of the resin molded portion protruding to the lower surface side of the island, the socket portion is formed on a tester or substrate for continuity test. The electrical connection between each lead pin and the external terminal can be performed simply by inserting the lead pin into the socket mounting portion or the like.

Further, according to the present invention, an LD chip and a light receiving element are mounted on an island, and parallel lead pins electrically connected to the LD chip and the light receiving element are dispersed in a pair of left and right resin molded portions and vertically arranged. In the semiconductor laser unit in which the left and right resin molded portions and the island are fixed to each other by fixing the joining portions together to form a single package, the left and right resin molded portions are arranged in parallel with a lead frame. For the lead pins, while molding to cover each lead pin leaving an electrical connection surface on the protruding end surface or side surface of the inner lead and the outer lead,
The gist of the present invention is that a socket portion is formed at a portion of the left and right resin molded portions protruding toward the lower surface of the island so that an electrical connection surface of an outer lead of each lead pin is exposed. According to such a configuration, the pair of left and right resin molded portions that hold the parallel lead pins in the vertical direction and the island are integrated by fixing the joined portions to each other. The unit can be assembled and formed by an assembling method. In this assembling method, the resin molded portion and the island holding the parallel lead pins are respectively prepared and assembled, so that the productivity can be improved.

Each of the outer leads of the parallel lead pins is covered with a resin molded portion except for an electrical connection surface on a side surface, and the lower ends of the outer leads are bent inward and protected by the resin molded portion. Is preferred. According to such a configuration, the lower end of the outer lead is reliably protected, and the deformation of the outer lead end can be more effectively prevented.

It is preferable that each of the inner leads of the parallel lead pins is covered with a resin molded portion while leaving an electrical connection surface at the protruding end surface. According to such a configuration,
The wire bonding loop distance for electrically connecting the lead pin to the LD chip or the light receiving element can be minimized.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 8 is a perspective view showing an example of an embodiment of a semiconductor laser unit according to the present invention, FIGS. 1 to 7 are perspective views showing manufacturing steps of the semiconductor laser unit A, and FIGS.
10 is a cross-sectional view showing a state of mounting on a board, FIG. 10 is a bottom view thereof, and FIG. 11 is a partially cutaway front view showing a state of connection to a connector.

The semiconductor laser unit A has an LD chip (laser diode chip) 1 for light source and a light receiving element 2 for signal reading mounted on an island 3 as shown in FIGS. The parallel lead pins 4, 4... Electrically connected to the element 2 are dispersed in a pair of left and right resin molded parts 5, 5 and held vertically, and these left and right resin molded parts 5 and the island 3 are joined. The parts are fixed and assembled together to form a single package, the top surface of the package is covered with a cover 6 to protect the LD chip 1 and the light receiving element 2, and a hologram element 7 is mounted on the top surface of the cover 6. To form a hologram type pip-up.

The island 3 is formed with high precision by cold casting or the like. The island 3 is formed in a disk shape in plan view as shown in FIG.
The left and right mounting holes 3b, 3b are provided except for a, and the raised portion 3a is formed so as to rise along the diameter of the island 3. A vertical upright surface 3c is formed on the side surface of the substantially central portion in the length direction of the raised portion 3a, and the monitor photodiode 10 is fixed to the vertical upright surface 3c using a solder material such as silver paste. The LD chip 1 is fixed to the surface of the photodiode 10 by bonding or the like. Ridge 3a
Is a horizontal upper surface 3d on the right side of the vertical upright surface 3c.
Is a mounting surface of the light receiving element 2, and the light receiving element 2 is fixed to the horizontal upper surface 3d by bonding or the like as shown in FIG. The island 3 has a portion other than the vertical upright surface 3c on the side peripheral surface of the raised portion 3a as a joining surface 3e serving as a joining portion with the left and right resin molded portions 5, and a predetermined portion of the joining surface 3e A recess 3f for accommodating a ground lead pin 11 described later
Is recessed.

As shown in FIG. 2, the left and right resin molding portions 5
With respect to the parallel lead pins 4, 4... Of the lead frame 8, a mold is formed so as to cover each lead pin 4 while leaving the electrical connection surface 9a on the end face of the inner lead and the electrical connection surface 9b on the side surface of the outer lead. The upper part 5a covering the inner lead and the lower part 5b covering the outer lead are formed in a stair-like manner, except for a difference in small points, and the inner surface of each resin molded part 5 is formed. A U-shaped joint surface 5c is formed to be a joint between the island 3 and the opposing resin molded part 5. Thus, when the two are combined (when they are matched), the U-shaped joint surfaces 5c, 5c are configured to create a relationship in which the tips of the joint surfaces abut each other with a space in the center. 5
The right and left resin molded portions 5, 5 and the island 3 are fixed by using a joining means such as ultrasonic welding while bringing the joining surfaces 3e of the islands c and 5c into close contact with each other. Further, an electrical connection surface 9b of the outer lead of each lead pin 4 is exposed at a portion of the resin molded portion 5 projecting to the lower surface side of the island 3, that is, the lower portion 5b, and the left and right resin molded portions 5, 5 are joined. At this time, the socket portion 12 is formed.

The lead pins 4, 4... Arranged in parallel are formed by molding the left and right resin molding portions 5, 5 with a resin mold, and are dispersed and held by the two resin molding portions 5, 5. That is, the lead pins 4, 4,... Use a lead frame 8, and the lead frame 8 is a strip-shaped ultra-thin metal plate,
It is formed by subjecting an alloy plate, a copper plate, or the like to a plurality of lead pins 4 in parallel with a desired pitch by applying a known means such as press molding or etching. 5) by setting the lead frame 8 in a mold and molding the same with resin, thereby dispersing the lead pins 4, 4,... And integrally forming the left and right resin molding portions 5, 5 in a vertical and skewered manner. Will be retained. As shown in FIG. 2, the lead pins 4, 4,... Are separated by the center line 8a of the lead frame 8 between the part held by one resin molded part 5 and the part held by the other resin molded part 5. After the left and right resin molding portions 5 are formed, the lead frame 8 is divided at the center line 8a, and the divided left and right lead frames are started up, as shown in FIG. Then, the left and right resin molding portions 5, 5 holding the parallel lead pins 4, 4,... In the vertical direction come to face each other. As shown in FIGS. 2 and 9, the lead pins 4, 4... Are bent inward at predetermined positions so that the lower end portions 4a of the outer leads are buried in the resin molded portions 5, and the lower end portions 4a are joined to the resin molded portions. 5 protected.

Reference numeral 11 denotes a ground lead pin, which is shown in FIG.
As shown in FIG.
And is formed to protrude from the upper edge of the upper step portion 5a of the resin molded portion 5 facing the concave portion 3f.

First, the joint (assembly) of the island 3 and the left and right resin molded portions 5, 5 for holding the parallel lead pins 4, 4,...
The left and right lead frames 8 ′ divided by the boundary are respectively raised and arranged so that the left and right resin molded portions 5 and 5 face each other,
Next, in one lead frame 8 ', the upper step 5a of one resin molded part 5 for holding the parallel lead pins 4, 4...
, So that the joining surfaces 3e and 5c are brought into close contact with each other, and then the upper step 5a of the other resin molding portion 5 holding the parallel lead pins 4, 4... 3 is inserted into the other mounting hole 3b to bring the joining surfaces 3e, 5c, 5c into close contact with each other, and then the joining surfaces are fixed to each other using a joining means such as ultrasonic welding, so that the left and right resin moldings are formed. The parts 5, 5 and the island 3 come together integrally (see FIGS. 3 and 4).

The assembly composed of the island 3 and the left and right resin molded portions 5 and 5 is formed by cutting the projecting end 11a of the ground lead pin 11 housed in the housing recess 3f from above. After the half-split portions 11a 'and 11a' are crimped and fixed to the edge of the concave portion 3f to increase the fixing strength, the electrical connection surface 9a which becomes the protruding end surface of the inner lead of each lead pin 5 and the vertical upright surface 3c, The LD chip 1 and the light receiving element 2 fixed to the horizontal upper surface 3d are electrically connected by wire bonding 13. In addition, in order to obtain more stable electrical conduction, the crimped portion may be joined with a conductive adhesive or the like.

Also, the lower step 5 of the left and right resin molded parts 5, 5
The outer leads of each of the lead pins 4, 4... covered with b are protected by the resin molding portion 5 in a state where the electrical connection surface 9b with the external terminal is exposed on the side surface of the lower portion 5b.

After the connection by the wire bonding 13 is completed, the cover 6 is covered from above to cover the entire upper surface of the assembly, and the LD chip 1, the light receiving element 2, and the protruding end surface of the inner lead (electrical connection surface 9a). Then, the wire bonding 13 is protected (see FIG. 5). Thereafter, as shown in FIG. 6, the parallel lead pins 4, 4... Are cut from the lead frame 8 'along the bottom surface of the resin molded portion 5. At this time,
Since the bottom surface of the resin molded portion 5 serves as a guide surface and the lower end portion 4a of the outer lead is protected by the resin molded portion 5, an appropriate cutting process can be performed without bending the cut surface. In addition, portions of the left and right resin molded portions 5 and 5 protruding toward the lower surface side of the island 3, that is, lower left and right portions
A socket portion 12 is formed in each of b, 5b so that the electrical connection surface 9b of the outer lead of each of the lead pins 4, 4,... is exposed.

The hologram element 7 is attached to the central window hole 6a of the cover 6, and the assembly of the semiconductor laser unit A is completed. In addition, since the protruding end surface of the lead pin 4 is a cut surface, it is preferable to perform a lapping process to improve conductivity and connection reliability. For fixing the cover 6 and the hologram element 7, various fixing means such as fitting, engaging, bonding, welding and the like can be adopted. Molding the resin molded portion 5 using a heat-resistant resin, plating the lead frame 8 with palladium or the like improves heat resistance and durability, and prevents migration of silver whiskers into the resin portion. It is preferable for prevention.

Thus, the semiconductor laser unit A having the above-described structure has pre-formed left and right resin molded portions 5 and 5 for holding the parallel lead pins 4, 4. Can be provided with an assembly type semiconductor laser unit in which the bonding surfaces 3e and 5c are fixed to each other.
The vertical holding of the lead pins 4, 4... With respect to the resin molded portion 5 is performed by resin molding using the lead frame 8, and the resin molded coating layer (the resin molded portion 5) for each lead pin 4 is formed. Is set to the necessary and optimum limit with the accuracy of the molding die, it is possible to reduce the size to a desired size in spite of the assembly method. Further, since the island 3 is formed of a metal material and has excellent surface accuracy in flatness and perpendicularity, it is possible to stably and accurately mount components such as the LD chip 1 and the light receiving element 2 which require mounting accuracy. be able to. Moreover, the grounding means is formed by caulking and fixing the ground lead pin 11, and the caulking and fixing is effectively used as a means for increasing the fixing strength between the resin molded portions 5, 5 and the island 3, so that no plating treatment is required. Then, the crimping and fixing can be performed to increase the bonding strength at the time of assembling the resin molded portion 5 and the island 3. Even though the semiconductor laser unit is an assembling system, the grounding means and the fixing strength are increased with a simple structure. It can also serve as a means.

Since the parallel lead pins 4, 4... Are held in the vertical direction, the periphery of the LD chip 1 and the light receiving element 2 on the island 3 is not occupied by the inner leads of each lead pin 4, and the size is small. It is also possible to respond to the change. Also, since the lead pins 4, 4,... Can be made more dense with the manufacturing accuracy of the lead frame, and since the lead frames for a plurality of products can be formed once or continuously on a strip-shaped metal plate, the lead pins 4, 4,. , 4
.. Can be vertically supported on the island 3 with high integration and high precision without using any special bonding or fixing means. As shown in FIG. Compared with the case of forming by bending, the forming operation and the process are simplified, and a highly reliable semiconductor laser unit can be provided without being affected by bending accuracy or the like. Needless to say, in addition to these advantages, the present invention has the effect according to the present invention.

The embodiment of the semiconductor laser unit according to the present invention has been described above. However, the present invention is not limited to this, and is within the scope of the technical idea described in the claims of the present invention. If so, it is possible to adopt another different embodiment.
No. 86, Japanese Patent Application No. 9-59239, Japanese Patent Application No. 9-5924
It is preferable to appropriately adopt the technical concept disclosed in No. 0 or the like in the appropriate place of the above-described embodiment, because a synergistic effect between the configuration according to the prior proposal and the configuration according to the present invention can be expected. For example, the above-mentioned semiconductor laser unit A has the same structure as the conventional semiconductor laser unit shown in FIG.
100 and the resin molding portion 5 on the left and right are integrated with the island 3 by fixing the joint surfaces 3a and 5c to each other. If the structure disclosed in the above-mentioned proposal is adopted for the electrical connection surface between the inner lead of the lead pin and the LD chip and the light receiving element, etc., the miniaturization and cost reduction of the semiconductor laser unit are promoted. It is preferable in making it.

FIGS. 9 and 10 show a state where the above-described semiconductor laser unit A is mounted on a wiring board B. FIG. The wiring board B is generally used in this kind of technical field such as a resin board, a ceramic board, a printed board, etc., and has a wiring pattern B1 made of copper on one surface thereof. At a predetermined position of the wiring board B, a mounting port B2 into which the socket section 12 of the semiconductor laser unit A is inserted in a fitting manner is formed, and at the opening edge of the mounting port B2, the socket section 12 is formed.
A contact (external terminal) B3 is formed to contact the electrical connection surface 9b exposed on the outer surface of the substrate.

Then, the socket portion 12 of the semiconductor laser unit A is inserted into the loading port B2 in a fitting manner, and each of the electrical contact surfaces 9b exposed on the outer surface of the socket portion 12 comes into contact with a predetermined contact B3. And the electrical contact surface 9b
And the contact B3 are soldered, and if necessary, the socket portion 12 or the resin molded portions 5, 5 are bonded to the wiring board B.
The semiconductor laser unit A is mounted on the wiring board B by soldering, tape fixing, or the like. According to such a mounting structure, it is possible to solve the conventional problem that the mounting work of connecting the lead wires to the outer leads of each lead pin and soldering them is solved, and the automation of the pickup assembling work can be promoted.

FIG. 11 shows a state in which the semiconductor laser unit A is connected to the connector C. Connector C is
A receiving portion C1 in which the socket portion 12 of the semiconductor laser unit A is removably mounted, and a contact C2 on the inner surface of the receiving portion C1 which is in contact with the electrical connection surface 9b exposed on the outer surface of the socket portion 12, are elastically connected. It is arranged to appear and disappear by deformation. Then, the socket portion 12 of the semiconductor laser unit A is inserted into the receiving portion C1 in a fitting manner so that each of the electrical contact surfaces 9b exposed on the outer surface of the socket portion 12 comes into contact with a predetermined contact B3. The electrical contact surface 9b and the contact B3 are soldered, and if necessary, the socket portion 12 or the resin molded portions 5, 5 are adhered, soldered, or taped to the wiring board B to form a semiconductor laser unit. A is mounted on the wiring board B. According to such a mounting structure, it is possible to eliminate the conventional problem that required the mounting work of connecting the lead wires to the outer leads of each lead pin and soldering, and further does not require a fixing means such as soldering or bonding. In addition, since the semiconductor laser unit A can be mounted in a one-touch system, it is expected that automation of the pickup assembling work is greatly promoted.

[0029]

As described above, in the semiconductor laser unit according to the present invention, since the outer leads are protected by the resin molding while leaving the electrical connection surfaces with the external terminals, the cutting, fixing, etc. in the manufacturing process thereof are performed. In various operations and during handling after production, deformation of the outer lead end can be effectively prevented, and production can be performed with good yield and at low cost. Also, on the lower surface of the island, a socket portion where the electrical connection surface of the outer lead of each lead pin is exposed is formed in a protruding shape, and by simply inserting this socket portion into a socket mounting portion formed on a tester or a substrate, each The electrical connection between the lead pins and the external terminals can be made. Therefore, it is possible to expect a great improvement in test work after manufacturing, mounting on an apparatus such as an electric device, and assembling work.

According to the second aspect of the present invention, the pair of left and right resin molded portions holding the parallel lead pins and the island are integrated, so that the semiconductor laser unit having the above-described effect can be manufactured by an assembling method. Can be. In this manufacturing method, a resin molded portion holding parallel lead pins and an island are separately prepared and assembled, so that a significant improvement in productivity can be expected.

According to the third aspect, since the lower end of the outer lead of each lead pin is bent inward and buried in the resin molded portion, the lower end of the outer lead is securely protected, and the deformation of the end of the lead pin is more effectively performed. Can be prevented.

According to the fourth aspect, the inner lead of each lead pin is covered with the resin molded portion while leaving an electrical connection surface on the protruding end surface, so that the lead pin can be electrically connected to the LD chip or the light receiving element. Of the bonding loop can be minimized.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a process of attaching an LD chip to an island.

FIG. 2 is a perspective view showing a state in which a resin molding portion is formed on a parallel lead pin of a lead frame by a resin mold.

FIG. 3 is a perspective view showing a process of integrally assembling the left and right resin molded portions and the island.

FIG. 4 is a perspective view showing a step of attaching the light receiving element.

FIG. 5 is a perspective view showing a cover attaching process.

FIG. 6 is a perspective view showing a cutting step of a lead pin.

FIG. 7 is a perspective view showing a process of attaching the hologram element.

FIG. 8 is a perspective view showing a completed state of the semiconductor laser unit according to the present invention.

9 is an enlarged cross-sectional view showing a state where the semiconductor laser unit shown in FIG. 8 is mounted on a substrate.

FIG. 10 is a bottom view of FIG. 9;

11 is a partially cutaway front view showing a connection state of the semiconductor laser unit shown in FIG. 8 to a connector.

FIG. 12 is an exploded perspective view of a conventional semiconductor laser unit.

FIG. 13 is a perspective view of the semiconductor laser unit of FIG. 12 before assembling a resin molded portion.

FIG. 14 is a perspective view of a conventional semiconductor laser unit.

FIG. 15 is a partially omitted cross-sectional view of a conventional semiconductor laser unit.

[Explanation of symbols]

 A: Semiconductor laser unit 1: LD chip (laser diode chip) 2: Light receiving element 3: Island 4: Lead pin 5: Resin molded part 6: Cover 7: Hologram element 8: Lead frame 9a, 9b: Electrical connection surface 12: Socket part

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Kenji Bono 755-1, Ogano, Ogano-machi, Chichibu-gun, Saitama

Claims (4)

[Claims] 1. A laser diode chip for a light source and a light receiving element for signal reading are mounted on an island, and parallel lead pins electrically connected to the laser diode chip and the light receiving element are held vertically in a resin molded part. A resin package in which the resin molded portion and the island are integrally assembled to form a single package, wherein the resin molded portion is arranged such that, with respect to parallel lead pins, protruding end surfaces or side surfaces of an inner lead and an outer lead. And forming a socket portion that exposes the electrical connection surface of the outer lead of each lead pin at a portion of the resin molded portion protruding toward the lower surface of the island, while leaving the electrical connection surface to cover each lead pin. A semiconductor laser unit characterized in that: 2. A laser diode chip for a light source and a light receiving element for signal reading are mounted on an island, and parallel lead pins electrically connected to the laser diode chip and the light receiving element are provided on a pair of left and right resin molded portions. A semiconductor laser unit in which the left and right resin molded portions and the island are fixed to each other and fixedly assembled into one package by dispersing and holding the resin molded portions in the vertical direction. The part is formed so as to cover each lead pin while leaving electrical connection surfaces on the protruding end faces or side faces of the inner lead and the outer lead, respectively, for the parallel lead pins of the lead frame, and the island lower surface in the left and right resin molded parts. The socket part where the electrical connection surface of the outer lead of each lead pin is exposed at the part protruding to the side The semiconductor laser unit, wherein the door. 3. Each of the outer leads of the parallel lead pins is covered with a resin molded portion except for an electrical connection surface on a side surface, and the lower ends of the outer leads are bent inward by the resin molded portion. 3. The semiconductor laser unit according to claim 1, which is protected. 4. The semiconductor laser unit according to claim 1, wherein each of the inner leads of the parallel lead pins is covered with a resin molded portion except for an electrical connection surface at a protruding end surface.