GB2310387A - Method for producing molding die for synthetic resin lens barrel having a helicoid and for producing the lens barrel - Google Patents
Method for producing molding die for synthetic resin lens barrel having a helicoid and for producing the lens barrel Download PDFInfo
- Publication number
- GB2310387A GB2310387A GB9701481A GB9701481A GB2310387A GB 2310387 A GB2310387 A GB 2310387A GB 9701481 A GB9701481 A GB 9701481A GB 9701481 A GB9701481 A GB 9701481A GB 2310387 A GB2310387 A GB 2310387A
- Authority
- GB
- United Kingdom
- Prior art keywords
- helicoid
- male
- molding die
- female
- threads
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D1/00—Producing articles with screw-threads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/24—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass dies
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
- G02B7/102—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens controlled by a microcomputer
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/02—Bodies
- G03B17/04—Bodies collapsible, foldable or extensible, e.g. book type
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/02—Bodies
- G03B17/12—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets
- G03B17/14—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets interchangeably
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
- G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
- G03B7/091—Digital circuits
- G03B7/097—Digital circuits for control of both exposure time and aperture
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
- G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
- G03B7/10—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device a servo-motor providing energy to move the setting member
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B9/00—Exposure-making shutters; Diaphragms
- G03B9/08—Shutters
- G03B9/10—Blade or disc rotating or pivoting about axis normal to its plane
- G03B9/24—Adjusting size of aperture formed by members when fully open so as to constitute a virtual diaphragm that is adjustable
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/22—Secondary treatment of printed circuits
- H05K3/28—Applying non-metallic protective coatings
- H05K3/281—Applying non-metallic protective coatings by means of a preformed insulating foil
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
A method for producing zoom lens male and female helicoid molding dies The method includes the steps of firstly, preparing a cutting tool having an angle identical to a male die thread set angle. Secondly, the male helicoid molding die is machined to form a helicoid portion thereof using the cutting tool. Next, an electric spark machining electrode is prepared having a helicoid portion whose shape is identical to a shape of the helicoid portion of the male helicoid molding die, by a mechanical cutting operation, using the cutting tool. Then a helicoid portion of the female helicoid molding die is formed by electric spark machining using the electric spark machining electrode.
Description
METHOD FOR PRODUCING MOLDING DIE FOR SYNTHETIC
RESIN LENS BARREL HAVING A HELICOID AND
FOR PRODUCING THE LENS BARREL
The present invention relates to a lens barrel made of synthetic resin having a helicoid (thread) and a method for producing a molding die assembly for the same.
A helicoid of a lens barrel is provided with adjacent trapezoidal threads and grooves formed alternately along a circumferential direction of the lens barrel. In the case of a metric thread1 the angles of the trapezoidal threads and grooves in a section including an axis of the lens barrel are identical. In a developed view, regardless of whether the threads or grooves of the helicoid are provided externally or internally, they are defined by an identical angle. However, in practice the angle of the trapezoidal grooves is larger than the angle of the trapezoidal threads in a section perpendicular to the direction of an extension of the threads. As the lead angle increases, for example, it exceeds 30 degrees, so does the difference in the angle (angle difference) between the trapezoidal grooves and the threads. The reason for this is that the helicoid formed by the threads and grooves, which are defined by an identical angle in a developed view, is wound onto a cylindrical lens barrel. The angle difference inevitably occurs so long as the threads and grooves are defined by an identical angle.
In a conventional helicoid having a small lead angle, the engagement error (meshing error) due to the angle difference between the trapezoidal threads and grooves is negligible. However, if the lead angle is large, the engagement error is not negligible since the helicoids do not come into surface contact but come into line contact due to the meshing error.
In theory, the shape of the trapezoidal threads or the trapezoidal grooves in a section perpendicular to an extension direction of the threads can be automatically determined when the shape of the trapezoidal grooves or the trapezoidal threads is determined. However, it is difficult to precisely analyze the shape of the trapezoidal threads and grooves. This difficulty increases as the lead angle increases. Consequently, it is extremely difficult to produce molding dies used to form a member having a helicoid.
It is an object of the present invention to provide a method for producing a molding die assembly for a lens barrel, particularly for a lens barrel having a helicoid with a large lead angle, wherein no strict analysis of the shape of the trapezoidal threads and grooves is needed.
Another object of the present invention is to provide a lens barrel obtained by a molding die assembly thus produced.
According to an aspect of the present invention, there is provided a method for producing a male helicoid molding die which is adapted to manufacture an inner barrel having a male helicoid, and for producing a female helicoid molding die which is adapted to manufacture an outer barrel having a female helicoid which can engage with said male helicoid of the inner barrel. The method includes the steps of firstly, setting an angle of trapezoidal threads of the male helicoid to be identical to an angle of trapezoidal grooves of the female helicoid in a section perpendicular to a direction of an extension of the threads and preparing a cutting tool having an angle identical to the set angle. Secondly, the male helicoid molding die is machined to form a helicoid portion thereof using the cutting tool. Next, an electric spark machining electrode is prepared having a helicoid portion with a shape identical to a shape of the helicoid portion of the male helicoid molding die, by a mechanical cutting operation, using the cutting tool. Then a helicoid portion of the female helicoid molding die is formed by electric spark machining using the electric spark machining electrode.
Alternatively, it is possible to set the angle of the trapezoidal threads of the male helicoid to be identical to the angle of the trapezoidal grooves of the female helicoid.
In this alternative a method for producing a male helicoid molding die which is adapted to manufacture an inner barrel having a male helicoid, and for producing a female helicoid molding die which is adapted to manufacture an outer barrel having a female helicoid which can engage with the male helicoid of the inner barrel, is provided. The method includes the steps of firstly, setting an angle of trapezoidal grooves of the male helicoid to be identical to an angle of trapezoidal threads of the female helicoid in a section perpendicular to a direction of an extension of the threads and preparing a cutting tool having an angle identical to the set angle. Secondly, the female helicoid molding die is machined to form a helicoid portion thereof, using the cutting tool. Next, an electric spark machining electrode is prepared having a helicoid portion whose shape is identical to a shape of the helicoid portion of the female helicoid molding die, by a mechanical cutting operation using the cutting tool. Then a helicoid portion of the male helicoid molding die is formed by electric spark machining using the electric spark machining electrode.
With the production method of the present invention, a pair of inner and outer barrels in which the angle of the trapezoidal grooves (trapezoidal threads) of the male helicoid is identical to the angle of the trapezoidal threads (trapezoidal grooves) of the female helicoid can be obtained without the need for a detailed analysis of the angles of the threads and grooves.
According to another aspect of the present invention, there is provided a synthetic resin lens barrel having an inner barrel of synthetic resin having a male helicoid and an outer barrel of synthetic resin having a female helicoid which can engage with the male helicoid. An angle of the trapezoidal grooves of the male helicoid and an angle of the trapezoidal threads of the female helicoid are identical in a section perpendicular to a direction of an extension of the threads.
In an alternative, the angle of the trapezoidal threads of the male helicoid and the angle of the trapezoidal grooves of the female helicoid are identical in a section perpendicular to the direction of an extension of the threads.
~ The basic concept of the present invention resides thus in the fact that if the mating male (external) and female (internal) helicoid portions of the male and female molding dies are machined by an identical cutting tool, the male (external) and female (internal) helicoids obtained using the male and female molding dies are deemed to have been formed by the same cutting tool, so that a smooth or certain engagement of the male and female helicoids can be realized without a complex mathematical analysis of the shape of the helicoids. However, it is practically impossible to form the male and female helicoid portions of the male and female molding dies using the same cutting tool. Relatedly, according to the present invention, one of the male and female helicoid portions of the male and female molding dies and an electric spark machining electrode which is adapted to produce the helicoid portion of the other molding die are machined by the same tool.
Examples of the present invention will now
be described below in detail with reference to the accompanying drawings, in which similar reference numerals indicate similar elements, and wherein:
Figure 1 is a perspective view of synthetic resin lens barrels having helicoids (threads), by way of example,
of the present invention;
Figure 2 is an enlarged perspective view of an inner lens barrel having a male helicoid (external thread);
Figure 3 is a plan view of the lens barrel shown in
Fig. 2;
Figure 4 is a sectional view of a male helicoid in a sectional plane 13 shown in Fig. 3, by way of example;
Figures 5A and 5B are schematic views of a. molding die and an electric spark machining electrode of the present invention;
Figure 6 is a conceptual view of an electric spark machining for making one of cores of a male helicoid molding die assembly, using an electric spark machining electrode shown in Fig. 5B; and
Figure 7 is a schematic cross-sectional view of a molding die assembly which is comprised of a plurality of the cores made through the electric spark machining shown in
Fig. 6.
Fig. 1 shows an example of an inner barrel 10 and an outer barrel 20 both of which are made of synthetic resin, in which the barrels 10 and 20 are produced using a molding die assembly embodying the present invention.
The inner barrel 10 is provided on an outer peripheral surface thereof with a male helicoid 11. The male helicoid 11 has a large lead angle, for example greater than 30 degrees, and is about 45 degrees in the illustrated embodiment. The outer barrel (stationary barrel) 20 is provided on an inner peripheral surface thereof with a female helicoid 21. The female helicoid 21 engages with the male helicoid 11. The male helicoid 11 and the female helicoid 21 have trapezoidal threads gila, 21a and trapezoidal grooves llb, 21b, respectively. The shape of the male helicoid 11 will be discussed below with reference to Figs. 2 through 4.
If the inner barrel 10 is sectioned along a plane 13 perpendicular to the direction of an extension of the threads of the male helicoid 11, the section is in the shape of an ellipse 14, as shown in Fig. 2. The included angle "B" between the edges of the trapezoidal threads ila of the male helicoid 11 is not identical to the included angle "A" between the edges of the trapezoidal grooves lib thereof in the elliptical section, namely A > B. Consequently, if the included angle B between the edges of the trapezoidal thread 21a of the female helicoid 21 is designed to be identical to the included angle B of the trapezoidal thread 11a of the male helicoid 11, the helicoids 11 and 21 do not come into surface contact.
With the present invention, once the shape of the male helicoid 11 and the female helicoid 21 is determined, the angle of the threads lla and the corresponding grooves of the female helicoid 21 is determined and thereafter, a cutting tool 30 corresponding to the angle is formed. Upon producing a male helicoid molding die (assembly) 31 to manufacture the male helicoid 11 of the inner barrel 10 and a female helicoid molding die (assembly) 36 to manufacture the outer barrel 20., a helicoid portion 32 of a plurality of cores of the male helicoid molding die 31 for the inner barrel 10, and a helicoid groove portion 34 of an electric spark machining electrode 33 which is adapted to carry out electro-spark machining of the molding die 36 for the female helicoid 21 of the outer barrel 20, are cut using the cutting tool 30 mentioned above, as shown in Figs. 5A and 5B.
The electric spark machining electrode 33 on which the helicoid groove portion 34 has been formed is set in an electric discharging machine 40 to machine the cores 36a and 36b of the female helicoid molding die 36, which is adapted to manufacture the outer barrel 20, that corresponds to the female helicoid 21, as shown in Figs. 6 and 7. The cutting tool 30 is not limited to that shown in Figs. 5A and 5B, and an end mill can be practically used as the cutting tool 30.
If the inner barrel 10 and the outer barrel 20 are produced using the male helicoid molding die 31 and the female helicoid molding die 36 as constructed above, the angle of the threads ila of the male helicoid 11 is identical to the included angle between the edges of the trapezoidal grooves of the female helicoid 21 which are engaged with the threads lla. Consequently, a smooth engagement between the threads and the corresponding grooves can be certainly established. Namely, the shape of the male helicoid 11 of the inner barrel 10 produced using the male helicoid molding die 31 corresponds to the shape of the male helicoid molding die 31, as indicated by dashed hatching in
Fig. 5A. The shape of the female helicoid 21 of the inner barrel 20 produced by the female helicoid molding die assembly 36 is identical to the shape of the electric spark machining electrode 33, since the shape of the discharging electrode 33 is transferred to the female helicoid molding die 36 whose shape is reproduced on the female helicoid 21 of the outer barrel 20. Namely, the threads of the male helicoid 11 of the inner barrel 10 and the grooves of the female helicoid 21 of the outer barrel 20 can be deemed to have been cut by the same cutting tool 30. Thus, the threads of the male helicoid 11 and the grooves of the female helicoid 21 have an identical angle. Consequently, the threads of the male helicoid 11 can be smoothly and certainly engaged in the grooves of the female helicoid 21 due to a complementary relationship in the shape therebetween, as can be seen in Figs. 5A and SB.
With a second embodiment of the present invention, once'the shape of the male helicoid 11 and the female helicoid 21 is determined, the angle A between the edges of the grooves llb of the male helicoid 11 and the included angle B' between the edges of the threads of the female helicoid 21 are determined. In the second embodiment, a helicoid portion of the female helicoid molding die for the outer barrel, and a helicoid portion of an electric spark machining electrode which is adapted to carry out an electro-spark machining of the male helicoid molding die for the male helicoid of the inner barrel, are cut using the same cutting tool 30. The helicoid portion of the male helicoid molding die is subject to electro-spark machining in which the electric spark machining electrode is used.
As can be understood from the above discussion, relating to the present invention, the molding die for a lens barrel, which is provided with a helicoid, particularly one having a large lead angle, and the lens barrel can be easily produced without the need for a detailed analysis of the shapes of the corresponding trapezoidal threads and grooves.
Claims (8)
1. A method for producing a male helicoid molding die for manufacturing an inner barrel having a male helicoid, and for producing a female helicoid molding die for manufacturing an outer barrel having a female helicoid for engaging with said male helicoid of said inner barrel, the method comprising the steps of:
setting an included angle of trapezoidal threads of said male helicoid to be identical to an included angle of trapezoidal grooves of said female helicoid in a section perpendicular to a direction of an extension of said threads and providing a cutting tool with a profile having an included angle identical to said set angle;
machining said male helicoid molding die to form a helicoid portion thereon'using said cutting tool;
providing an electric spark machining electrode having a helicoid portion whose shape is identical to a shape of said helicoid portion of said male helicoid molding die, by a mechanical cutting operation using said cutting tool; and
forming a helicoid portion on said female helicoid molding die by electric spark machining using said electric spark machining electrode.
2. A method for producing a male helicoid molding die for manufacturing an inner barrel having a male helicoid, and for producing a female helicoid molding die for manufacturing an outer barrel having a female helicoid for engaging with said male helicoid of said inner barrel, comprising the steps of: arranging for an included angle of trapezoidal grooves of said male helicoid to be identical to an included angle of trapezoidal threads of said female helicoid in a section perpendicular to a direction of an extension of said threads and providing a cutting tool with a profile having an included angle identical to said set angle;
machining said female helicoid molding die to form a helicoid portion thereon, using said cutting tool;
providing an electric spark machining electrode having a helicoid portion whose shape is identical to a shape of said helicoid portion of said female helicoid molding die, by a mechanical cutting operation using said cutting tool; and
forming a helicoid portion on said male helicoid molding die by electric spark machining using said electric spark machining electrode.
3. A synthetic resin lens barrel comprising an inner barrel of synthetic resin having a male helicoid and an outer barrel of synthetic resin having a female helicoid for engaging with said male helicoid, wherein an included angle of trapezoidal grooves of said male helicoid and an included angle of trapezoidal threads of said female helicoid are identical in a section perpendicular to a direction of an extension of said threads.
4. A synthetic resin lens barrel comprising an inner barrel of synthetic resin having a male helicoid and an outer barrel of synthetic resin having a female helicoid for engaging with said male helicoid, wherein an included angle of trapezoidal threads of said male helicoid and an included angle of trapezoidal grooves of said female helicoid are identical in a section perpendicular to a direction of an extension of said threads.
5. A synthetic resin lens barrel according to claims 3 or 4, wherein the barrel is a zoom lens barrel.
6. A zoom lens barrel comprising an inner barrel and an outer barrel formed using the method of claims 1 or 2.
7. A method for producing male and female helicoid molding dies substantially as hereinbefore described with reference to Figures 5A to 7 of the accompanying drawings.
8. A synthetic resin lens barrel substantially as hereinbefore described with reference to Figures 5A to 7 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9816338A GB2325425A (en) | 1996-02-21 | 1997-01-24 | Method for producing molding die for synthetic resin lens barrel having a helicoid and for producing the lens barrel |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3412496 | 1996-02-21 | ||
| GB9614331A GB2303222B (en) | 1995-07-07 | 1996-07-08 | A lens shutter type of zoom lens camera and a method of controlling such a camera |
| JP24756796A JP3411764B2 (en) | 1996-02-21 | 1996-09-19 | Method for manufacturing mold for molding lens barrel made of synthetic resin having helicoid |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9701481D0 GB9701481D0 (en) | 1997-03-12 |
| GB2310387A true GB2310387A (en) | 1997-08-27 |
| GB2310387B GB2310387B (en) | 1999-03-17 |
Family
ID=27268382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9701481A Expired - Fee Related GB2310387B (en) | 1996-02-21 | 1997-01-24 | Method for producing molding die for synthetic resin lens barrel having a helicoid and for producing the lens barrel |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2310387B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI382897B (en) * | 2008-05-16 | 2013-01-21 | Hon Hai Prec Ind Co Ltd | Thread die |
| CN103273151A (en) * | 2013-06-07 | 2013-09-04 | 南通超达机械科技有限公司 | Electric discharge machining technology for three-plate mould |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1339425A (en) * | 1970-05-19 | 1973-12-05 | Lucas Industries Ltd | Reflector panels for road vehicles |
| GB2262899A (en) * | 1991-12-13 | 1993-07-07 | Koito Mfg Co Ltd | Producing a die for automobile fisheye lens |
| JPH0724652A (en) * | 1993-06-30 | 1995-01-27 | Omron Corp | Machining of forming die |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3123745A1 (en) * | 1980-06-19 | 1982-03-04 | Canon K.K., Tokyo | Method for producing a lens holder subassembly |
-
1997
- 1997-01-24 GB GB9701481A patent/GB2310387B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1339425A (en) * | 1970-05-19 | 1973-12-05 | Lucas Industries Ltd | Reflector panels for road vehicles |
| GB2262899A (en) * | 1991-12-13 | 1993-07-07 | Koito Mfg Co Ltd | Producing a die for automobile fisheye lens |
| JPH0724652A (en) * | 1993-06-30 | 1995-01-27 | Omron Corp | Machining of forming die |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI382897B (en) * | 2008-05-16 | 2013-01-21 | Hon Hai Prec Ind Co Ltd | Thread die |
| CN103273151A (en) * | 2013-06-07 | 2013-09-04 | 南通超达机械科技有限公司 | Electric discharge machining technology for three-plate mould |
| CN103273151B (en) * | 2013-06-07 | 2015-11-18 | 南通超达机械科技有限公司 | Three plates mold electrical discharge machining process |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9701481D0 (en) | 1997-03-12 |
| GB2310387B (en) | 1999-03-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20060124 |