JP2002228904A - Optical member made of resin and method of manufacturing for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical member made of a resin designed to permit rapid and easy packaging of the optical member and a method of manufacturing for the same. SOLUTION: The optical member 2 is provided with metallic members 3 and 3 projecting from the optical member 2. Since land portions 4b and 4b on a stationary section side and the metallic members 3 and 3 can be fixed by solder 5, the optical member 2 can be rapidly and easily mounted. The soldering work is carried out in the state of forming positioning portions 3a and 3a to the metallic members 3 and 3 and detaining the positioning portions 3a and 3b to detaining portions 4a and 4a on the stationary section side, by which the optical member 2 can be fixed with high mounting accuracy to a prescribed mounting region 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin optical member such as a lens or a mirror used in an optical head device, and more particularly to a resin optical member capable of mounting the optical member in a short time and a method of manufacturing the same. About the method.

[0002]

2. Description of the Related Art An optical head device is provided in various disk devices such as a CD (compact disk) and an MD (mini disk). In the optical head device, various optical members such as a mirror member such as a half mirror or a beam splitter and a lens are fixed to a predetermined portion in the optical head device by an adhesive such as an ultraviolet curable resin.

Light emitted from a light-emitting element such as a laser is reflected or transmitted by the half mirror, beam splitter, or the like, and guided to the lens. In the lens, the incident light is condensed at one point, a spot diameter having a constant outer diameter is formed on the surface of the disk, and the reflected light is received by the light receiving element via the lens and a half mirror or a beam splitter. And the information written on the disc is read.

[0004]

However, the conventional means for bonding an optical member with an ultraviolet curable resin requires a considerable waiting time until the ultraviolet curable resin is cured.

Further, if an external force such as vibration is applied to the optical head device during the waiting time, the optical member is displaced and cannot be mounted with high accuracy.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a resin optical member capable of mounting an optical member quickly and easily and a method of manufacturing the same.

[0007]

The present invention is characterized in that a resin optical member for reflecting or transmitting incident light is integrated with a metal member for fixing the optical member. Things.

According to the present invention, since the metal material portion of the optical member can be soldered, the optical member can be fixed in a short time. Therefore, there is no possibility of displacement during mounting, and the optical member can be fixed at a predetermined position with high accuracy.

In the above, a plurality of the optical members are connected at predetermined intervals by the metal members to form an aggregate, and the optical members from the aggregate to the metal members between the adjacent optical members are formed. Is preferably provided with a cutting line for cutting off.

[0010] In the above-described configuration, by forming an optical member assembly, it is possible to easily handle a small optical member. Also, the individual optical components can be easily separated from the assembly during assembly, so that they are less likely to be lost.

Also, one of the metal member and the optical member is provided with an engagement recess, and the other is provided with an engagement protrusion, and the engagement recess and the engagement protrusion engage with each other. Preferably, the metal member and the optical member are engaged.

With the above configuration, it is possible to make it difficult for the metal member and the optical member to be separated from each other.

Further, it is preferable that the metal member has a reference portion for positioning the optical member.

In this configuration, since the positioning can be performed at an appropriate position before the soldering, the soldering operation is easy. Also, the mounting accuracy of the optical component can be improved.

In the method of manufacturing a resin optical member according to the present invention, a part of a continuous band-shaped metal member is included in a mold.
An optical member integrated with the metal member is formed by injecting a resin material into the molding die.

In the above, an aggregate composed of a plurality of optical members is formed on the metal member, the metal member is transferred after the molding, and the next optical member aggregate is formed by the molding die, and this is repeated. Thus, it is preferable that the optical member is formed continuously with the band-shaped metal member.

After the optical member is formed, the metal member is cut and separated into individual optical members.

According to the above manufacturing method, it is possible to easily manufacture an optical component having a metal member, that is, an optical member that can be fixed by soldering.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an assembly of mirrors as an embodiment of a resin optical member according to the present invention, wherein A is a state in which the optical members are connected in one direction, and B is a state in which the optical members are connected in another direction. It shows the state that is being done. FIG. 2 is a perspective view showing a fixed state of a mirror cut from the assembly shown in FIG. 1A. 3 shows an example of the metal member, A is a perspective view of the metal member, B is a cross-sectional view showing the state of attachment of the metal member of A and the optical member, FIG. 4 shows another example of the metal member, FIG. 2B is a perspective view of the metal member, and FIG.

In FIG. 1A, a plurality of triangular prism-shaped optical members 2, 2, 2,...
1) They are arranged at regular intervals in a state facing the direction.
Also, in FIG. 1B, similar optical members 2, 2, 2,... Are arranged at regular intervals with the inclined surface 2a directed in the X2 direction intersecting the longitudinal direction in the drawing.

Each of the optical members 2 shown in FIGS. 1A and 1B is made of a transparent resin material, and has a slope 2a.
Has a plurality of metal films and dielectric films laminated by means such as vapor deposition. The optical component 2 is, for example, a total reflection mirror. In an optical head device or the like, the optical component 2 reflects parallel light emitted from a light emitting element such as a laser and guides the parallel light to a disk surface via a convex lens.

On the X side 1 and X2 side of each optical member 2,
A pair of strip-shaped metal members 3, 3 extending in the longitudinal direction are provided, and adjacent optical members 2 are connected to the metal members 3, 3.
Are connected by The metal member 3 can be made of, for example, copper, but is not limited to copper as long as the metal can be soldered.

The metal members 3, 3 are formed with positioning portions 3a cut out in a V-shape at predetermined intervals in the longitudinal direction. The positioning portion 3a may be a hole that penetrates in the thickness direction.

As shown in FIG. 3A, the positioning portion 3a
An engaging portion 3b is formed between the positioning portion 3a and the positioning portion 3a. The engaging portion 3b is formed as a countersunk hole having a small hole diameter on the front side (the side on which the optical member is provided) and a large hole diameter on the back side. On the other hand, as shown in FIG.
A bottomed portion is formed with a head-to-be-engaged engaged portion 2A. The engagement between the engaged portion 2A and the engaging portion 3b prevents the optical member 2 from being detached from the metal member 3. I have. The engaged portion 2A is formed by filling the engaging portion 3b with a molten resin and curing the resin at the stage of molding the optical member.

Alternatively, the engaging portion may protrude from the metal member 3 in the direction of the bottom surface of the optical member 2, for example, as shown in FIG. 3c. Also in this case, when the optical member 2 is molded, the molten resin is filled around the engaging portion 3c and hardened, so that the engaging portion is formed on the bottom surface side of the optical member 2.

As shown in FIGS. 1A and 1B, each of the optical members 2 is formed to have a fixed length before and after the metal member 3 about the engaging portion 3b or 3c in the longitudinal direction. The optical members 2 are connected by the metal members 3 to form an integrated optical member assembly 1. The optical member 2 shown in FIG. 1 is cut along the cutting line LL of the optical member assembly 1 and separated into individual optical members 2.

As shown in FIG. 2, an attachment area 4 for mounting the optical member 2 is provided in the fixing portion of the optical head device. Locking portions 4a, 4a, and solder fixing lands 4b, 4b.

The locking portions 4a, 4a are formed as convex protrusions protruding from the mounting area 4. Then, the pair of metal members 3, 3 lock the positioning portions 3a, 3a from both sides, so that the mounting area 4 of the optical head device is formed.
The optical member 2 can be positioned.

When the optical member 2 is locked in the mounting area 4, the metal members 3, 3 are arranged on the surfaces of the lands 4b, 4b. Therefore, the lands 4b, 4b and the metal members 3, 3 can be fixed by the solder 5 in a state where the optical member 2 is locked in the mounting region 4. Therefore, the waiting time for fixing the optical member 2 can be significantly reduced.

In the optical head device, since the optical member 2 can be soldered while being held in the predetermined mounting region 4, the mounting accuracy of the optical member 2 can be improved. Further, in the locked state, the displacement of the optical member 2 can be prevented, so that the soldering operation can be performed quickly and easily.

When the positioning portions 3a, 3a are through holes, the locking portions 4a, 4a are preferably provided so as to be inserted into the through holes. Positioning parts 3a,
Since the optical member 2 can be positioned and the position of the optical member 2 can be prevented by extrapolating the 3a to the locking portions 4a, 4a, the land portions 4b,
4b and the metal members 3 and 3 can be easily soldered.

Hereinafter, a method of manufacturing the above-mentioned optical member assembly will be described. FIG. 5 is a process chart showing a method of manufacturing an optical member, wherein A shows a first step, B shows a second step, and C shows a step of continuously forming an optical member.

In this manufacturing method, as shown in FIGS. 5A to 5C, a molding die 41 for molding the optical member 2, an extruder 42 for injecting a molten resin material into the molding die 41, and Transfer means 43 is provided. The molding die 41 includes a pair of upper molding die 41A and lower molding die 41.
B.

Inside the upper mold 41A, a plurality of cavities 41a, 41a,
41a is provided. The upper mold 41A is formed with a runner 41b for guiding the molten resin to the plurality of cavities 41a, 41a, 41a and an injection port 41c.
Further, a concave portion (groove) for arranging the metal members 3 and 3 in parallel is formed in the lower mold 41B in the Y direction in the drawing (not shown). The extruder 42 is, for example, a screw extruder. In the barrel of the extruder 42, the resin material is melted and agitated, and the molten resin is extruded from the nozzle at the tip thereof into the injection port 41c of the upper mold 41A. The transfer means 43 is, for example, a belt conveyor, and is capable of intermittently moving the belt 43a in a certain direction (Y1 direction in FIG. 5).

The manufacturing method in the present embodiment is based on insert molding. That is, as shown in FIG. 5A, in the first step, the lower molding die 41B is placed on the belt 43a of the transfer means 43, and the metal members 3, 3 are longitudinally disposed in the recesses of the lower molding die 41B. They are arranged parallel to each other in the Y) direction. In the second step shown in FIG. 5B, the upper molding die 41A is set on the lower molding die 41B,
The metal members 3, 3 are set in a state of being sandwiched between the upper mold 41A and the lower mold 41B. And the injection port 41c
The molten resin is injected into each cavity 41a through the runner 41b.

After a lapse of a predetermined time, the upper mold 41A
Is pulled upward in the drawing, an assembly 1 of optical members in which the metal member 3 and the plurality of optical members 2 are integrated on the lower molding die 41B can be formed.

As shown in FIG. 5C, after the completion of the second step, the transfer means 43 is moved by a predetermined distance in the upstream (Y1) direction, and the first and second steps are repeated again and continuously. May be performed. In this case,
On the metal members 3, 3, a new optical member assembly 1 can be formed continuously next to the optical member assembly 1 formed in the previous first and second steps. . Therefore, the number of the individual optical members 2 to be formed can be adjusted in units of the optical member assembly 1 according to the length of the metal members 3.

In the second step, a relatively high-pressure molten resin is injected into the cavity 41a. Therefore, a part of the molten resin enters the back side from the small diameter on the surface side of the engaging portion 3b of the metal member 3, so that the head portion is engaged between the engaging portion 3b and the surface of the transfer member 43. The portion 2A can be formed. Alternatively, in the case of the engaging portion 3c shown in FIG. 4A, the engaged portion is formed by wrapping the molten resin around the engaging portion 3c. Then, as the molten resin cures, the aggregate 1 of the optical members including the plurality of optical members 2 and the metal members 3 and 3 are integrated, so that they can be prevented from separating from each other.

[0040]

According to the present invention described in detail above, since the displacement of the optical member can be prevented, the optical member can be mounted with high accuracy.

Further, since the metal member can be soldered, the optical member can be quickly and easily attached and fixed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an assembly of mirrors as an embodiment of a resin optical member according to the present invention, wherein A is a state where the optical members are connected in one direction, and B is a state where the optical members are connected in another direction. State,

FIG. 2 is a perspective view showing a fixed state of a mirror cut from the aggregate of FIG. 1A;

3A and 3B show an example of a metal member, A is a perspective view of the metal member, B is a cross-sectional view showing an attached state of the metal member of A and the optical member,

FIG. 4 shows another example of the metal member, wherein A is a perspective view of the metal member, B is a cross-sectional view showing the state of attachment between the metal member of A and the optical member,

FIG. 5 is a process chart showing a method for manufacturing an optical member, wherein A is a first step, B is a second step, C is a step of continuously forming an optical member,

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Assembly of optical member 2 Optical member 2A Engaged part 3 Metal member 3a Positioning part 3b, 3c Engaging part 4 Mounting area 4a Locking part 4b Land part 5 Solder 41 Mold 41a Cavity 42 Extruder 43 Transfer means L Cutting line

Claims (7)

[Claims] 1. A resin optical member, wherein a resin optical member for reflecting or transmitting incident light and a metal member for fixing the optical member are integrated. 2. The resin optical member according to claim 1, wherein the plurality of optical members are connected by the metal member at regular intervals to form an aggregate. 3. An engagement portion is provided on one of the metal member and the optical member, and an engaged portion is provided on the other, and the engagement portion and the engaged portion are engaged with each other. 3. The resin optical member according to claim 1, wherein the metal member and the optical member are integrated. 4. The resin optical member according to claim 1, wherein a reference portion for positioning the optical member is formed on the metal member. 5. A resin characterized in that a part of a continuous band-shaped metal member is included in a mold, and a resin material is injected into the mold to form an optical member integral with the metal member. A method for manufacturing an optical member. 6. An assembly made of a plurality of optical members is formed on the metal member, the metal member is transferred after the formation, and the next assembly of optical members is formed by the forming die, and this is repeated. 6. The method for manufacturing a resin optical member according to claim 5, wherein the aggregate of the optical members is continuously formed on the strip-shaped metal member. 7. The method of manufacturing a resin optical member according to claim 5, wherein the metal member is cut into individual optical members after the optical member is formed.