GB2325425A - 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
- GB2325425A GB2325425A GB9816338A GB9816338A GB2325425A GB 2325425 A GB2325425 A GB 2325425A GB 9816338 A GB9816338 A GB 9816338A GB 9816338 A GB9816338 A GB 9816338A GB 2325425 A GB2325425 A GB 2325425A
- Authority
- GB
- United Kingdom
- Prior art keywords
- helicoid
- male
- threads
- lens barrel
- female
- 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.)
- Withdrawn
Links
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/30—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp
- H05B41/32—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp for single flash operation
- H05B41/325—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp for single flash operation by measuring the incident light
-
- 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
- G03B2217/00—Details of cameras or camera bodies; Accessories therefor
- G03B2217/002—Details of arrangement of components in or on camera body
-
- 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)
- Mechanical Engineering (AREA)
- Optics & Photonics (AREA)
- General Engineering & Computer Science (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
A synthetic resin lens barrel having an inner barrel and an outer barrel of synthetic resin. The inner barrel is provided with a male helicoid (11) and the outer barrel is provided with a female helicoid (32) for engaging with the male helicoid. One of the male or female helicoids is provided with trapezoidal cross-section grooves. The other helicoid is provided with trapezoidal cross-section threads. An included angle of the trapezoidal cross-section grooves is identical to an included angle of the trapezoidal cross-section grooves in a cross-section perpendicular to the direction of the respective grooves and threads.
Description
1 2325425 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 thread, the angles of the trapezoidal threads and grooves in a section including an axis off the lens barrel are identical. In a develoned view, regardless of whether the threads or grooves of the helicoid are providpd externally or internally, they are defined by an identicl 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 a-ngle (angle difference) between the trapezoidal grooves and the 2 threads. The reason f or this is that the helicoid f ormed 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 he,Licoids 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 shame of the trapezoidal grooves or the trapezoidal threads is determined. However, it is difficult toprecisely 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 3 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 4 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 tZapezoidal 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 cutting portion of the male helicoid molding die, by a mechanical operation, using the cutting tool. Then a helicoid 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 5.
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 directi.,On 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 shaDe 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.
6 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 (inte=a-l) 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 hel-4coids can be realized without a comolex mathematical analysis of the shape of the helicoids. However, it is practically impossible to form t---e male and female helicoid portions off the male az-,d female 7 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 th read); Figure 3 is a plan view of the lens barrel show--- in 8 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 SA 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. I shows aii- 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 9 provided on an inner peripheral surf ace 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. Ila, 21a and trapezoidal grooves l1b, 21b, respectively. The shape o f 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 OBN 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 llb 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 Ila 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 Ila and the corresponding grooves of the female helicoid 21 is determ.ined and therea-fter, a cutting tool 30 corresponding to the angle is f ormed. 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 too! 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 11 engaged with the threads 11a. 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. SA. 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 5B.
with a second embodiment of thepresent invention, once'the shame oil the male helicoid 11 and the female helicoid 21 is determined, the angle A between the 12 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 theouter '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.
13
Claims (4)
1. 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.
2. 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.
3. A synthetic resin lens barrel according to claims I or 2, wherein the barrel is a zoom lens barrel.
4. A synthetic lens barrel substantially as hereinbefore described with reference to Figures 5A to 7 of the accompanying drawings.
Applications Claiming Priority (4)
| 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 |
| GB9701481A 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9816338D0 GB9816338D0 (en) | 1998-09-23 |
| GB2325425A true GB2325425A (en) | 1998-11-25 |
Family
ID=27451486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9816338A Withdrawn 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 |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2325425A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4385023A (en) * | 1980-06-19 | 1983-05-24 | Canon Kabushiki Kaisha | Method of making a lens barrel assembly |
-
1997
- 1997-01-24 GB GB9816338A patent/GB2325425A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4385023A (en) * | 1980-06-19 | 1983-05-24 | Canon Kabushiki Kaisha | Method of making a lens barrel assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9816338D0 (en) | 1998-09-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |