JP3144399U - Optical glass lens set - Google Patents

Abstract

The present invention provides an optical glass lens set by molded insert or press molding which has reduced the cost and increased the possibility of mass production.
An optical lens in which an outer shoulder portion is formed on a non-optical surface of an outer periphery of an optical surface in injection molding or press molding molds 31 and 32 of a molded insert. 20, a light-shielding annular piece 30 that is in close contact with the outer shoulder of the lens and exposes the optical surface, and a gap piece 40 that provides a predetermined gap between the lenses, and is filled by injecting or pressurizing a thermoplastic resin, Molded integrally with the holding ring 10.
[Selection] Figure 15

Description

  The present invention relates to an optical glass lens set. In particular, the present invention relates to an optical glass lens set suitable for use in assembling between an optical glass lens and a holding ring, and particularly suitable for use of a small lens and a mobile phone terminal lens, and a manufacturing method thereof.

An optical lens is the smallest optical part of a camera or camera-equipped mobile phone terminal lens, and is composed of one or more optical lenses when used. As shown in FIG. 1, the optical lens 20a is generally manufactured from an optical plastic or optical glass material. It comprises an optical surface 21a and an outer shoulder 22a, and the optical surface 21a with the optical working surface is generally a circular surface and is a non-optical working surface that surrounds the outer periphery of the optical surface 21a. ) 22a is circular or square. In general, the lens 20a is fixed in a lens module, but is first positioned and fixed to a holding ring 10a to constitute an optical lens set 1a. The holding ring is made of a metal or a plastic material, so that the lens 20a is aligned with the central axis (optical axis) of the lens. Furthermore, the holding ring 10a (lens set 1a) can be slid within the lens module by an actuator to achieve the purpose of changing the focus (US7,312,933, US7,095,572, US2007 / 0024989, JP3650594, etc.) reference).

A known fixing method between the lens 20a made of plastic or glass and the holding ring 10a is shown in FIG. In particular, for an optical glass lens, first, a holding ring 10a corresponding to the shape (circular or rectangular) of the outer shoulder 22a of the lens 20a is designed. However, the outer shape of the holding ring 10a is not limited to a circle or a rectangle. Further, the lens 20a is positioned in the holding groove 10a in a predetermined groove and fixed with an adhesive. The adhesive is usually a UV curing agent, and generally needs to undergo a curing process such as UV irradiation curing by a UV curing apparatus.
Since the lens 20a is very small, when it is positioned and fixed by an automatic operation machine or automatic adhesive application, the optical surface 21a is often scratched or the adhesive adheres (that is, the adhesive overflows). This wastes time in the manufacturing process and increases the defective product rate.
In particular, when positioning and fixing with respect to the glass lens 20a and the plastic holding ring 10a, the UV curing agent operation is more difficult, the defective product rate is high, and the UV curing process takes time, hindering cost reduction. (See JP3791615, JP06258562 and US7224542, US2007 / 0047109).

A technique for performing injection molding by first inserting a fitting part into a mold hole is called an insert injection molding method. This is because a fitting part (generally a metal part) is first put in a mold hole of a predetermined mold, and then a molten plastic (rubber) material is filled in a predetermined molding area (that is, a pouring area) in the mold hole. A part or the whole of the fitting part is covered, cooled and cured, and the product is taken out from the mold.
This manufacturing method has already been used in large quantities for electronic parts, connectors, mechanical parts, and LEDs (see US5,923,805, TWM313317, JP07120610, etc.). With this manufacturing method, when manufacturing an outer cap with a plastic lens, the outer cap (housing) is used as a fitting part, first put in a mold hole, and a plastic lens is injection-molded with a plastic material. Alternatively, a plastic lens is used as a fitting part, and an outer cap is injection-molded with a plastic material and integrally joined to manufacture an integrally molded outer cap having a plastic lens (see TW 0528279, US Pat. No. 6,825,503).
Alternatively, a glass plate is used as a fitting part, and the periphery of the glass plate is covered with a plastic material to form lenses for various uses such as window glass (JP622511113, etc.).
Alternatively, as in US 6,710,945, two plastic material injection holes are used and the lens and lens barrel are injection molded in several steps.
Alternatively, an infrared glass piece is used as a fitting part, and a mount is injection molded to cover it.

Alternatively, as in US7,332,110, etc., the spectacle frame is used as a fitting part, first put into the mold hole of the mold, and the plastic lens preform is heated and softened by the press molding method to mold Then, the mold hole shape is transferred onto the softened preform using the heating and pressurization. In this way, the preform is molded into a lens, and at the same time, integrally formed with the spectacle frame to form spectacles.
However, this press molding method cannot be applied to the manufacturing process of the glass lens and plastic holding ring integrated joint. This is because if the plastic holding ring is used as the fitting part, the softening temperature of the optical glass is about 500 ° C., which is much higher than the deformation temperature of the plastic material of the plastic holding ring, 80 ° C. When the mold reaches the softening temperature of the optical glass, the plastic holding ring is already deformed and cannot be molded. Therefore, although the press molding method can be used for mass production, since the plastic holding ring is used as the fitting part and the glass material is used as the material for the press molding, it is difficult to realize technically.
Since the accuracy requirement of the optical glass lens set for the lens is high, the positioning accuracy of the glass lens and the holding ring affects the imaging effect of the lens. Therefore, by developing new technology, especially by combining optical glass lenses and holding rings, it is possible to solve the problem of high defective product use of adhesives and long manufacturing processes, and to mass-produce high-precision optical glass lens sets. This is an urgent task.
Japanese Patent No. 3791615

The first problem to be solved by the present invention is to provide an optical glass lens set. The optical glass lens is used as a molded insert, and is first placed in a mold hole of a mold and positioned by a positioning device. A holding ring is formed by plastic injection molding or plastic press molding by injection molding technology or press molding technology, and the holding ring is simultaneously wrapped on the outer shoulder of the optical glass lens. Covered and intimately formed into a one-piece optical glass lens set with a holding ring, which simplifies the manufacturing process, increases yield, lowers costs, and makes the manufactured lens set easier to encapsulate in the lens Especially small lenses, portable Suitable for use with phone terminal lenses,
A second problem to be solved by the present invention is to provide an optical glass lens set, and further to use an optical glass lens and a light-shielding annular piece having a corresponding shape to be in close contact with the outer shoulder of the lens, The light-shielding annular piece is made of a material that does not transmit light, is placed in the mold hole of the mold together with the optical glass lens, is positioned by a positioning device, and is molded using the injection molding technique or press molding technique. The ring is tightly covered on the light shielding annular piece on the outer shoulder of the optical glass lens to form an integrally formed lens set including the holding ring and the light shielding annular piece. The installation of the positioning device creates a shielding action against the corresponding through-holes, so that the holding ring is completely To achieve optical effects, an imaging light beam passing through the lens optical surface to avoid affecting the imaging efficiency leak out from the hole.
The third problem to be solved by the present invention is to provide an optical glass lens set, which is applied to two or more optical glass lenses, which place a spacing piece between the two optical glass lenses. Then, the distance between the two optical glass lenses is fixed, and it is placed in the mold hole of the optical glass lens and the mold and positioned by a positioning device, and thus the molding holding ring covers the optical glass lens tightly. The optical glass lens set to be formed includes a holding ring and two or more optical glass lenses that are spaced apart from each other by a fixed distance, thereby maintaining the image quality of the optical glass lens.

In order to solve the above problems, the present invention provides the following optical glass lens set.

  As described above, the present invention is applied to the assembly between the optical glass lens and the holding ring, and is particularly suitable for the use of a small lens and a mobile phone terminal lens.

<First Example>
The present embodiment is an optical glass lens set including a single optical glass lens. As shown in FIGS. 2 and 3, the optical glass lens set 1 includes an optical glass lens 20 and a holding ring 10 used for fixing the lens 20.
The lens 20 is made of optical glass, and includes an optical surface 21 and an outer shoulder 22 that is a non-optical working surface surrounding the outer periphery of the optical surface 21. There are no restrictions on the shape of the optical surface 21 and the outer shoulder 22.
The lens 20 of this embodiment is manufactured by a precision glass molding method (Taiwan Utility Model No. 295755, etc.). The outer shoulder 22 is square and the optical surface 21 is biconvex. The holding ring 10 is molded on the outer peripheral surface of the outer shoulder 22 of the lens 20 by an injection molding technique, and is in close contact with and covers the outer shoulder 22. It forms an opening 11 at the central section position, allows the imaging light beam to pass through, and forms an integrally molded lens set 1 including the holding ring 10. The holding ring 10 of the present embodiment is a rectangular holding ring, and a guide rail 13 can be installed on the outer ring surface as necessary for assembly. When the lens set 1 is assembled in the lens module, Guide and move in the axial direction on the optical axis.

The lens set 1 of the present embodiment further includes two light shielding annular pieces 30 corresponding to the lens 20.
The light shielding annular piece 30 is made of a black plastic material having no light transmittance, and is adhered to two surfaces on the outer shoulder portion 22 of the lens 20 so as to be completely shielded (see FIGS. 4 and 5). Before injection molding the holding ring 10, it first adheres to the outer shoulder 22 of the lens 20 (described later), so that a part of the holding ring 10 after molding simultaneously adheres to the light shielding annular piece 30. At the same time, the integrally formed lens set 1 including the holding ring 10 and the light shielding annular piece 30 is formed.
The main function of the light-shielding annular piece 30 is to form an image by the imaging light rays passing through the optical action surface leaking out from an arbitrary cavity (such as the through hole 12 shown in FIGS. 3 and 4) on the holding ring 10. It is to prevent or avoid affecting the effect. Each through hole 12 positions the lens 20 into a perforation formed on the holding ring 10 in order to install a positioning device 33 (see FIG. 8) in the mold. Further, the light shielding annular piece 30 can further cover the entire outer shoulder 20 in the shielding range on the outer shoulder 20 of the lens 20, that is, only the optical surface 21 is exposed to the outside (FIG. 2 to FIG. 2). (See Figure 7.) As a result, a condensing action is generated on the lens 20, and an aperture stop function is provided.

As shown in FIGS. 8 to 16, the manufacturing process of the lens set 1 of this example is basically the same as that of the second example (lens set including two optical glass lenses). The manufacturing method will be described. It includes the following steps:
First, an optical glass lens 20 having at least one optical surface 21 and an outer shoulder 22 (the lens 20 in the figure includes two optical glass lenses 201 and 202) is prepared.
A molding mold 3 of injection molding technology is prepared for the lens 20. The mold 3 is generally composed of an upper mold 31 and a lower mold 32 as shown in FIG.
The lens 20 and the upper and lower light shielding annular pieces 30 are inserted into the mold 3 in order as fitting parts, and positioned as shown in FIG. The positioning device 33 can mainly make the optical axis of the optical surface 21 of the lens 20 correspond to the optical axis of the integrally formed lens set 1.
Further, the upper mold 31 and the lower mold 32 are closed together. As shown in FIG. 14, after the upper and lower molds 31 and 32 are closed, a casting section 34 used for molding the holding ring 10 in the mold 3 is partitioned into a predetermined section 34 of the holding ring 10, A material injection port 35 is installed on the mold 3. The shape of the predetermined area 34 (that is, the outer shape of the holding ring 10) or the position and number of the material injection ports 35 are configured according to the injection molding technique. The material injection port 35 of this embodiment is one.
Subsequently, the plastic material 50 heated to have a constant temperature (viscosity) is injected from the material injection port 35 to fill the pouring zone 34 as shown in FIG. The plastic material 50 of the present embodiment is a thermoplastic LCP resin. The LCP resin is heated to 300 ° C., the mold 3 is heated to 50 ° C., and then an injection molding operation is performed.
After the plastic material 50 is cooled and hardened, it is taken out to complete the integrally formed lens set 1 shown in FIG.

<Second Example>
The present embodiment is an optical glass lens set including a two-sheet optical glass lens. As shown in FIGS. 4 and 5, the lens set 1 of the present embodiment includes two lenses 20. It consists of two pieces 210, 202 consisting of a biconvex type optical glass lens 201 and a new moon type optical glass lens 202, a distance piece 40, which constitutes an optical imaging effect with a certain distance between them, and two pieces The holding ring 10 is used to fix the lenses 210 and 202 of the lens.
The lens 20 is made of optical glass, and the outer shoulder 22 is square, and is produced by a glass precision press molding method as in the first embodiment.
The spacing piece 40 is disposed between the two lenses 201 and 202, and the thickness thereof is determined according to the optical characteristics of the two lenses 201 and 202. The light-shielding annular piece 30 is made of a material that is in close contact with the outer shoulder portion 22 of the two surfaces of the lens 20 and does not have optical transparency such as plastic or aluminum foil. The holding ring 10 is formed by injection molding technology as a fitting part for inserting the light shielding annular piece 30, the lens 201, the spacing piece 40, the lens 202, and the other light shielding annular piece 30. An integrally molded lens set 1 including a holding ring 10 is formed on the outer shoulder 22 of the glass lens 20.

As shown in FIGS. 8 to 16, the manufacturing method of the lens set 1 of the present embodiment includes the following steps.
First, the light shielding annular piece 30, the lens 201, the spacing piece 40, and the lens 202 are prepared as molded inserts, and a molding mold 3 used for the injection molding technique is prepared as shown in FIG.
The above-described molded inserts are put in the mold 3 in order, and are positioned by the positioning device 33 on the lower mold 32 as shown in FIG.
Next, the upper mold 31 and the lower mold 32 are closed together. At this time, the vacuum suction operation is advanced at the same time, and it is avoided that air remains in the predetermined area 34 to be molded and affects the injection molding.
Further, the plastic material 50 heated up to a certain temperature (viscosity) is injected from the material injection port 35 and flows into the predetermined area 34 of the holding ring 10 to be filled as shown in FIG. The plastic material 50 of the present embodiment is a thermoplastic LCP resin. The LCP resin is heated to 300 ° C., the mold 3 is heated to 50 ° C., and then an injection molding operation is performed.
The plastic material 50 is taken out after being cooled and cured, and the integrally formed optical glass lens set 1 shown in FIG. 16 is completed.

<Third embodiment>
The present embodiment is a rectangular lens set 1 (see FIGS. 2 and 3) having a rectangular optical glass lens 20 (one or two). As shown in FIGS. The injection mold 3 of the set 1 includes an upper mold 31, a lower mold 32, a material injection port 35, a positioning device 33, and a heating lead 36.
The positioning device 33 is configured to include four positioning points, and sets the square lens 20 at the center by determining a distance and a position relative to the two positioning points in two sets.
The material inlet 35 has a molding flow design so that a liquid plastic material having a position and a pore size of 300 ° C. can flow into and fill the predetermined area 34 of the holding ring within a certain time. To.
The heating lead 36 is connected to a temperature controller of a plastic injection molding facility to control the temperatures of the upper mold 31 and the lower mold 32.
The manufacturing process of the rectangular lens set of this embodiment is the same as that of the second embodiment. The plastic material (LCP resin) is heated to 300 ° C., the mold 3 is heated to 50 ° C., and then the injection molding operation is performed.

<Fourth embodiment>
The present embodiment is an optical glass lens set 1 including a single optical glass lens 20 manufactured by a press molding method. As shown in FIGS. 2 and 3, the lens set 1 of this embodiment includes a lens 20 and a holding ring 10. The main structure is the same as that of the first embodiment, but the holding ring 10 is molded on the outer peripheral surface of the outer shoulder 22 of the optical glass lens 20 by the press molding molding technique. This is different from the injection molding technology.
As shown in FIGS. 22 to 26, the press molding molding method for the lens set 1 of the present embodiment includes the following steps.
First, an optical glass lens 20 having at least one optical surface 21 and an outer shoulder 22 is prepared.
A molding mold 3 of press molding molding technology is prepared for the lens 20. The mold 3 is generally composed of an upper mold 31 and a lower mold 32 as shown in FIG. The lens 20 and each of the upper and lower light shielding annular pieces 30 are used as molded inserts, which are sequentially placed in the molding mold 3 and positioned as shown in FIG. As shown in FIGS. 16 and 17, the lens 20 and the light shielding annular piece 30 are positioned by a positioning device 33 on the lower mold 32.
Further, a plastic preform 50 is manufactured from a certain amount of plastic material 50 and placed on the fitting part as shown in FIG. The plastic material 50 of this embodiment is a thermoplastic LCP resin.
Next, the upper and lower molds 31 and 32 are closed and heated. At this time, the vacuum evacuation operation is performed at the same time, so that the air remains in the predetermined area 34 to be molded and the press molding is prevented from being affected.
After the mold 3 is heated to 65 ° C., the upper mold 31 and the lower mold 32 are pressurized, and at the same time, the mold is continuously heated to 85 ° C. At this time, the pressure of the upper mold 31 and the lower mold 32 reaches a predetermined pressure of 1.4 MPa (200 psi), and the temperature of the plastic material 50 in the mold 3 reaches about 120 ° C. to 150 ° C. At this time, the plastic material 50 has already flowed into the predetermined molding area 34 of the holding ring 10, and press molding is performed on the upper and lower molds 31 and 32 as shown in FIG.
After the molding of the plastic material 50 is completed, the upper die 31 and the lower die 32 are started to be stepped down and lowered. When the normal pressure and temperature are lowered to 50 ° C to 60 ° C, the upper and lower die 31, 32 are separated. As shown in FIG. 26, the completed lens set 1 is taken out.

<Fifth embodiment>
This embodiment is an optical glass lens set 1 (not shown) having a circular optical glass lens manufactured by a press molding molding method, and the molding molds are an upper mold 31, a lower mold 32, positioning as shown in FIGS. A device 33 and a heating lead 36 are provided.
The positioning device 33 includes four positioning points (or three positioning points) so that the circular optical glass lens 20 can be centered.
The heating conductor 36 is connected to a temperature controller of a plastic injection molding facility and controls the temperatures of the upper and lower molds 31 and 32.
The manufacturing process of this embodiment and the fourth embodiment are basically the same.
First, the molded insert is placed in the positioning device 33, and then the plastic material 50 (usually in powder form or preform) is placed in the predetermined area 34 of the holding ring 10. Subsequently, the upper and lower molds 31 and 32 are heated to a predetermined temperature (such as 85 ° C.) to perform a press molding process.
The optical glass lens set 1 of the present invention and its manufacturing method have at least the following advantages.
1. The manufacturing method of the present invention can develop the manufacturing method of a known optical glass lens set, simplify the manufacturing process, increase yield, reduce cost, and increase the possibility of mass production of optical glass lens set. Can do.
2. The optical glass lens set 1 of the present invention is more easily encapsulated in the lens, and is particularly suitable for the use of small lenses and mobile phone terminal lenses, and is effective in improving the possibility of mass production of lenses.

It is an instruction diagram of a known technique. It is a top angle solid view of the lens set first embodiment of the present invention. 2 is a bottom angle solid view of the embodiment in FIG. FIG. 3 is a top view of FIG. FIG. 3 is a bottom view of FIG. FIG. 6 is a sectional view taken along section line 6-6 in FIG. FIG. 7 is a sectional view taken along section line 7-7 in FIG. It is manufacturing process explanatory drawing of this invention lens set 2nd Example. FIG. 9 is an instruction diagram in which each fitting component in FIG. 8 is already placed in a mold hole. FIG. 10 is an instruction diagram for opening a mold after molding in FIG. 9; FIG. 11 is an instruction diagram after removing the mold in FIG. 10 (taking out the lens set product). It is manufacturing process step explanatory drawing of this invention lens set 2nd Example. It is manufacturing process step explanatory drawing of this invention lens set 2nd Example. It is manufacturing process step explanatory drawing of this invention lens set 2nd Example. It is manufacturing process step explanatory drawing of this invention lens set 2nd Example. It is manufacturing process step explanatory drawing of this invention lens set 2nd Example. It is a shaping | molding mold figure of this invention lens set 3rd Example. FIG. 14 is an instruction diagram in which each fitting component in FIG. 13 is already placed in the mold hole. It is another type | mold mold figure of this invention lens set 3rd Example. It is a shaping | molding mold figure of 5th Example of this invention lens set. It is another type | mold mold figure of this invention lens set 5th Example. It is manufacturing process step explanatory drawing of 4th Example of this invention lens set. It is manufacturing process step explanatory drawing of 4th Example of this invention lens set. It is manufacturing process step explanatory drawing of 4th Example of this invention lens set. It is manufacturing process step explanatory drawing of 4th Example of this invention lens set. It is manufacturing process step explanatory drawing of 4th Example of this invention lens set.

Explanation of symbols

1 Optical glass lens set
10 Holding ring
11 opening
12 through holes
13 Guide rail
20, 201, 202 Optical glass lens
21 Optical surface
22 Outer shoulder
3 Mold
30 Shading ring
31 Upper mold
32 Lower mold
33 Positioning device
34 Predetermined area (flow-in area)
35 Material inlet
36 Heating conductor
40 spacing pieces
50 Plastic material

Claims (7)

It consists of one or more optical glass lenses, a light shielding annular piece and a holding ring,
The optical glass lens comprises an outer surface of an optical surface and a non-optical surface surrounding the outer periphery of the optical surface,
The light shielding annular piece exposes the optical surface and is in close contact with the outer shoulder of the optical glass lens,
The holding ring is formed on the outer peripheral surface of the outer shoulder portion of the optical glass lens by injection molding or press molding, and simultaneously covers and covers the outer shoulder portion of the optical glass lens. An optical glass lens set, wherein an opening for allowing an imaging light beam to pass is formed in a central optical surface area. The optical glass lens set according to claim 1, wherein the optical glass lens is a circular glass lens or a rectangular glass lens. 2. The optical glass lens set according to claim 1, wherein the outer shape of the holding ring is square and circular. 2. The optical glass lens set according to claim 1, wherein a material of the holding ring is a light opaque plastic. The optical glass lens set according to claim 1, wherein the light shielding annular piece further shields a non-optical working surface of the entire outer shoulder portion in a shielding range of the outer shoulder portion of the optical glass lens. The optical glass lens set according to claim 1, wherein the optical glass lens includes two or more optical lenses. The optical glass lens set is further installed with an interval piece interposed between the outer shoulder portions of the two optical glass lenses, whereby an interval distance corresponding to the thickness of the interval piece is provided between the optical working surfaces of the two optical glass lenses. The optical glass lens set according to claim 6, wherein:

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