JPS62131216A - Lens barrel parts - Google Patents

Abstract

PURPOSE:To fill up only a core layer resin to a mounting part of the attachment, thereby improving a strength of the mounting part of the attachment by providing a gate for pouring a resin at the end of the engaging parts of the lens barrel parts in forming the titled parts which provides the engaging part of the attachment at the top end thereof and provides the engaging parts at the post end thereof, by laminating a plural resins in a sandwich state. CONSTITUTION:The skin layer resin A is poured into a space from the gate 22g provided at the post end of the plural engaging parts 22e in such the way that the top end of said resin A draws a wave shape as shown by W1. After the prescribed amount of the skin layer resin A is poured into the space, the core layer resin B is poured into the space through the prescribed gate in such the way that the resin B passes through the skin layer resin A and the top of the skin layer resin A moves forward from W1 to W2 and further to W3. The amount of the skin layer resin A is determined so as to bury almost uniformly a surroundings wall of the space. The skin layer resin A is poured into the space in such the way that the top end of the resin A does not reach to the mounting parts 22f of the attachment, and then the core layer resin B is poured in such the way that said resin B forms the mounting parts 22f of the attachment.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial section) The present invention is applicable to optical devices such as lens barrels and
Regarding the lens barrel of the 9th aircraft.

In particular, the invention relates to a lens barrel member that constitutes a lens barrel and serves as an accessory mounting portion for mounting accessories.

(Prior art) The conventional lens barrel configuration includes a lens, a lens holding frame, a fixed cylinder, an intermediate cylinder, operation +3:i, etc. N L operation p rotates around the optical axis to rotate the lens holding frame through the intermediate cylinder. Many configurations are known in which the movement of the axis is controlled in one row direction.

In addition, as for the structure of the intermediate cylinder, a helicoid cylinder is known in which helical coils F are provided on the inner and outer peripheries in order to convert the rotational force around the optical axis of the first steering ring into movement of the optical axis of the lens holding frame. ing.

In the case of lens barrels, using metal materials such as aluminum (A) and brass (Bs) provides physical advantages, but at the same time increases costs due to alteration and machining, and improves productivity.
There are many problems such as the limitations of metallurgy (injection molding using resin materials instead of metal materials).Polycarbonate, ABS, and other suitable resin materials for the helicoid tube , polybutylene teretalate (PB
T), modified polyphenylene, and oxide A are known, and resin materials mixed with glass fiber and carbon fiber are used to further strengthen mechanical strength.

The above-mentioned glass fiber polycarbonate material can provide a helicoid tube with lower cost, higher precision, and guaranteed mechanical strength than conventional materials, but the glass fibers are exposed on the inner and outer peripheral surfaces of the helicoid tube. As a result, problems remain, such as requiring a high degree of sliding performance when sliding and screwing into the inner and outer fitting tubes of the helicoid tube.

] One of the solutions to the above two problems can be achieved by forming the cylindrical member into a laminated structure. For example, special public service in the 1970s-
Using sandwich molding (hereinafter referred to as SW molding) as described in the specification of Publication No. 28464, glass fibers, which will form the surface layer of the helicoid cylinder, are first placed in the cavity of a mold for forming the helicoid cylinder. By injecting a resin material with excellent sliding properties that does not cause contamination, and first injecting a resin material mixed with glass fiber that forms the core, the surface layer is made smooth, and the core is made of a resin with high mechanical strength, which solves the problem mentioned above. We can obtain a helicoid tube that solves the problem.

(Problems to be Solved by the Present Invention) FIG. 1 shows a cross-sectional view of an example of a lens barrel using helical coils l"t,':+ according to the present invention. In the figure, the symbol l indicates a fixed barrel. , and the bayonet ring 2 is attached to the rear end with hiss 4
Fix it with.

2a indicates a bayonet claw of the bayonet ring 2.

Reference numeral 6 designates a mount 4 member, in which a cylindrical portion 6b is integrally molded from the inner diameter of a disk portion 6a by resin molding.

The mount 4 member 6 is integrally formed with a plurality of engaging claws 6C that protrude rearward from the outer periphery of the disc portion 6a.

This engaging claw 6C is fitted into an engaging groove or hole provided in the bayonet ring 2 by utilizing the elasticity of the resin and fixed.

Reference numeral 8 denotes a movable ring, and a helicoid 8a is provided on the inner circumferential surface of the cylindrical body, and a ring-shaped protrusion 8C in which a pawl race 8b on which the bearing pole 10 moves is provided on the outer periphery -L.

Reference numerals 14 and 16 designate pole holding rings that hold the pole 10 and form a bearing section together with the ring-shaped protrusion 8C of the movable ring 8.

The pole holding ring 14 has an engagement groove or hole 41 on its outer circumference that engages with the protrusion 1a formed on the inner circumference of the fixed cylinder l.
However, an inclined surface for holding the pole lO is formed on the inner diameter surface thereof.

The pole retaining ring 16 is provided with a threaded portion 16a on its outer periphery to be screwed into the threaded portion 1b formed on the inner periphery of the fixed cylinder 1, and an inclined surface for holding the pole 1O.

Reference numeral 18 indicated by a two-dot chain line indicates the arrangement position of the movement amount detection device. An ultrasonic motor 20 for rotationally driving the movable ring 8 is disposed between the movable ring 8 and the fixed cylinder l.

The ultrasonic motor 20 consists of a rotor part and a stator part,
The stator section consists of a vibrating body 20a, a piezoelectric element 20b fixed to the vibrating body 20a, a holding member 20C, and a spring member 20d, and the rotor section consists of a friction member 20e and a connecting member 20g with the movable ring 8.

Reference numeral 22 denotes a helicoid tube according to the present invention.As shown in FIGS. 2 and 3, the helicoid tube 22 has a helicoid portion 2 that is screwed into the helicoid 8a of the rotation ring 8 in the tube portion 22a1.
2b, a lens holding frame portion 22c that holds the lens L; a wall portion 22d that connects the cylinder portion 22a and the lens holding frame portion 22c; a key having a recessed keyway 22e in the cylinder portion of the cylinder portion 22a extending toward the camera body; The protrusion 22E is a cylindrical part extending from the cylindrical part 22a toward the subject, and protrudes in the radial direction with respect to the optical axis O1, and is a mounting part 2 for attaching filter shade accessories.
It has 2f.

A lens holding ring 24 holds the lens groups L1 to L3, and is fixed to the helicoid tube 22.

26 is an aperture unit, and 28 is a motor for driving the aperture unit. The aperture unit and the motor 28 are fixed to the helicoid cylinder 22 mentioned above, but since they are not directly related to the present invention, the structure and operation will be explained below. Omit.

Next, the operation of the lens barrel configured in FIG. 1 will be explained.

When the lens barrel shown in the first figure is attached to the camera, the autofocus device on the camera side is activated, and the ultrasonic motor 2
Drive 0. Due to the rotation of the rotor part 20g of the motor 20, the rotating ring 8 connected to the rotor 20g
rotates around the optical axis. The rotating ring 8 is threadedly engaged with the helicoid tube 22, and the key groove 22 of the helicoid tube 22
Since the key member 30 fixed to the fixed cylinder 1 is engaged with the lens e, the helicoid cylinder 22 holds the lenses L1 to L6 and moves in the direction parallel to the optical axis by the rotation of the rotor 20g, thereby controlling the focus. It is done.

The helicoid cylinder 22 has a helicoid part 22b on the outer periphery of a cylinder part 22a, and has mounting parts 22f and key grooves 22e at the front and rear.
It is structurally complex, as it is connected to the lens holding frame part 22c via the wall part 22d, and dimensional accuracy of each part is required. Further, the cylindrical portion 22a of the helicoid tube 22 is required to maintain its roundness and have physical strength in order to house the aperture drive motor 28. The accessory mounting portion 22f is required to have strength rather than slidability since mechanical force is applied when connecting and disconnecting from the accessory.

For smooth rotation with the rotating ring 8, the surface layer of the helicoid portion 22b is required to have lubricity, and the core layer is required to have strength.

The keyway portion 22e engages with the key member 30, and the rotation ring 8
Because it is screwed together with the rotary ring 8, it is subjected to rotational action due to the rotation of the rotating ring 8, and the rotation is suppressed by the key member 30 and the key member 3
0 and the keyway 22e, mechanical strength and slidability are required.

(Step f for solving the problem) The present invention provides an engaging portion 22e between the helicoid portion 22b and other lens barrel constituent members, as in the helicoid lens barrel 22 shown in the first drawing.
And accessories installation i! 1122f is formed by sandwich layer molding of a plurality of resin materials, and in particular, the accessory mounting portion 22f is molded with a core layer resin that can ensure strength, thereby solving the above problem.

(Detailed Description of the Invention) FIG. 2 shows a sectional view of a main part of the device of this embodiment, and the reference numeral 31.
Reference numerals 32 indicate first and second injection cylinder units, respectively. The resin material A forming the skin layer is injected from the injection port 31a of the first injection cylinder unit, and the resin material A forming the skin layer is injected from the injection port 32a of the second injection cylinder unit. A resin material forming the core layer is injected.

34 is a mold member provided with a cavity 34a for the hollow cylindrical molded product of the helicoid lens barrel 22. The void 34
A is a cavity filled with resin for molding the helicoid lens barrel 22 shown in the first figure.

Reference numeral 36 indicates a fixed plate, and the fixed plate 36 has injection ports 31a of the first and second injection cylinder units.
*Sprues 36a and 36b are provided that connect to 32a.

38 is a runner plate located between the mold member 34 and the fixed plate 36. The line XI Ks indicates the joint surface between the mold member and the runner plate 36, and the joint surface x1-
The holes are provided in a direction perpendicular to the cylindrical axis direction of the hollow cylindrical molded body of the mold member 34.

Y knee Y'1 indicates the joint surface between the runner plate and the fixed plate.

The runner plate 38 has runners 38a1 and 38a2 parallel to the gap 34a of the mold member 34,
The runner 38a1 is parallel to the joint surface Xs Kt.
・Sprue 38 connected to 38 a2------
b, 38 b 2----1 are provided.

The sprues 36a and 36b of the fixed plate 36 are provided with runners 36c and 36d that are parallel to the joint surface x1-KI and connected to the sprues 36a and 36b, and the joint surface X5-y is provided on the exit II side of the runner 36CI+36d. :
A runner 36e is provided in a direction perpendicular to t.

This vertical runner 36e is the runner plate 3.
8 parallel runners 38b1 and 38b2---
Inherited from Ichi. 38C indicates runner lock.

Figure 3 asb shows the runners 38a and 38a2 in the runner plate and fixed plate of the molding machine shown in Figure 2.
------． 38b1 *38b2 --- shows an f-side view and a perspective view of the resin sprue and runner flowing through the runner lock 38C1, sprues 36a-36b, and runners 36C, 36d, and 36e.

FIG. 3C shows a cross-sectional view of a portion of the sprue and runner of the stationary plate. The outlet side of the runner 36c which is connected to the joint surface x1-z□ is the runner 3 rising vertically.
6f, and the runner 36f is connected to the vertical runner 36.
It is inherited from e.

In FIG. 3C, a indicates the height of the wall facing the outlet of the runner 36d, and b indicates the opening of the runner 36d.

The flow direction of the resin A flowing through the runner 36c is changed by the runner 36f, and the flow direction is changed to the vertical direction by the vertical runner 36e.However, the resin A flowing through the runner 36f and entering the vertical runner 36e flows into the runner due to the dimensional condition of a≧b. It becomes difficult to flow in the direction of 36d.

The resin flowing through the runner 36d also becomes difficult to flow in the direction of the resin runner 36f passing through the runner 36d due to the dimensional condition of a≧b.

FIG. 4 to FIG. 9 are diagrams for explaining the operation of this embodiment. FIGS. 6a and 6b show a state in which resin has not been injected into the fixing plate 36, runner plate 38, and mold member 34, and the I-warming member is fixed by a mold clamping device (not shown), and each runner and each The sprue and the cavity of the mold member are connected. Injection 1 of 1st and 2nd injection cylinder units 1 and 2
:] 31a and 32a are closed by needle valves 31b and 32b. In the uninjected state shown in FIG. 4a, the runner in FIG. 4 contains no resin.

Next, in the skin layer resin injection step, as shown in FIG. 5a, the needle valve 31 in the first injection cylinder unit 31 is
When b is opened, the skin layer resin material A in the first injection cylinder unit is sprue 36a provided on the fixing plate.
36b, the runners 36c and 36d, and the runners 38a1 to 38c of the runner plate to form the forming gap 34.
It is injected into a. The skin layer resin material A is injected into the injection port 31a.
・It comes out from 32a and enters conical sprues 36a and 36b, and then enters the horizontal runner 36c. The resin A entering the horizontal runner 36c is bent in its flow direction by the vertical runner 36f at the exit side of the runner 36c as shown in FIG. 38a
6 is bent perpendicularly to 6. Skin layer resin A passes from one runner 36c through vertical runner 36e to each runner 38b1-38b6 . 38at ~38
The resin is injected into the gap 34a through a6, but the resin sent from the injection cylinder unit 31 passes through the horizontal runner 36c and is injected into the runner 38 of the runner plate.
When sent to b1 to 38b6, the vertical runner 36e
By providing all the runners 38b1 to 38b6
As a result, as shown in FIG. It will be ejected.

When a predetermined amount of the skin layer resin material A has been injected into the molding cavity, the needle valve 31b of the first injection cylinder unit is closed, and the needle valve 32 of the second injection cylinder unit 32 is closed.
Open b and inject core layer resin B.

In order to inject the core layer resin B, the needle 32b of the second injection cylinder unit 32 is opened and the core layer resin B is injected.
] and injected onto the sprue 36b of the fixed plate 36.

The sprue 36b and runner 36d are filled with resin A to the extent of the previous r, but since they are still in a molten state, resin B is mixed with resin A.
While pressing the sprues 36b and 36d, the runner 38
b1-38 b6. 38a to 38a6 enter into the gap 34a of the cutter-shaped member 34. The core layer resin B that has entered the gap 34a presses the skin layer resin A injected in the previous step against the peripheral wall surface of the gap 34a, and penetrates into the inside of the skin layer resin A.

The core layer resin B injected from the injection port 32a is attached to the sprue 3.
6b, the runner plate 3 through the horizontal runner 36d
The core layer resin B passing through the runner 36d is injected into the runners 38b1 to 38b6 of No.8.
When entering the vertical runner 36e provided on the exit [] side of d, the flow direction of the resin is forcibly changed by hitting the facing surface 36g of the exit [-1] of the runner 36d forming the vertical runner 36e. and is directed toward the exit direction of the stacked runner 36e.

By directing the core layer resin B in the vertical direction by the vertical runner 36e, the core layer resin B is injected into each runner 38b, .about.38b6 of the runner plate 38 while being uniformly separated.

After a predetermined amount of core layer resin B is injected and maintained at a predetermined pressure for a predetermined period of time, the needle valve 3 of the second injection cylinder unit 32
2b is closed and cooled for an appropriate time.

(FIG. 7 aeb) L2 When the steps shown in FIG. 4 a-b to FIG. 7 a and b are completed, the process moves to the step of taking out the molded body from the mold.

As shown in FIG. 8, this molded body removal step is carried out by separating the mold member 34 from the joint surface of xs K1 shown in the second figure, and extruding the molded body in the gap by an extrusion means (not shown).

Next, the joint surface Y+Y''1 is separated, and the core layer resin B in each runner and each sprue is removed. A series of steps up to removal continues.

Figures 1O and 11 show the position of the resin injection gate and the progress of the injected resin in the gap when the helicoid lens barrel 22 is molded using the molding apparatus shown in Figures 2 to 9. .

In this embodiment, the gate is provided at the rear end position 22g of the engaging portion 22e, as shown in FIG.

Skin layer resin material A cylinder 52 injected from gate 22g
At the tip 22e1 of each of the engaging portions 22e provided on the circumference from the end of 2a, the resin is divided into the resin proceeding to the cylinder portion 22a and the resin proceeding to the wall portion 22d. After injecting a predetermined amount of skin layer resin A, which draws a waveform like Wl shown in Fig. 11, core layer resin B is injected from the second injection cylinder into the gap so as to push through the skin layer resin A from the same gate. Injected.

The temperature of the mold peripheral wall in the cavity where the injection resin is injected is 80±1
0'C, and the temperature of the injected resin is 300±10C for polycarbonate. For this reason, the skin layer resin that touches the peripheral wall of the mold loses its fluidity as heat is rapidly removed, but the inner skin layer resin advances along the peripheral wall as the core layer resin advances in the gap due to the injection pressure. do.

The tip of the skin layer resin A due to the subsequent injection of the core layer resin advances from W1 to W1 and further to W3. The amount of skin layer resin A to be injected is set to fill the peripheral wall within the gap almost uniformly, and the tip of the skin layer resin material A within the gap does not reach the accessory mounting portion 22f as shown in FIG. So,
The accessory mounting portion 22f is formed with the core layer resin B injected after the skin layer resin A.

(Effects of the Invention) As described above, the present invention provides a lens barrel member having an accessory mounting portion 22f at the tip of a helicoid lens barrel, etc., and an engaging portion 22e at the rear end, which is sandwiched with a plurality of resins. When molding is done by planting layers, by providing a resin injection gate at the end of the engaging part 22e, the accessory mounting part 22f can be filled with only the core layer resin material, ensuring the strength of the accessory mounting part. can do.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating mounting and molding of a lens barrel member 22 according to the present invention into a molded shape. FIG. 10 is a sectional view of a main part of the ttJ and ts member 22 according to the present invention. No. 1112 is a diagram illustrating the injection state of resin material. 22--One lens barrel member 22a--One cylinder part 22b--Helicoid part 22cm--Lens holding part 22d-m-Wall part 22e--One engaging part 22f--One flexible item attachment part 8m q mouth

Claims (1)

[Claims] Accessory attachment portions are provided at multiple locations on the outer periphery of the distal end of a tube member constituting the lens barrel, and an engaging portion that engages with another lens barrel member is located on the other end side in the middle of the accessory attachment portion in the circumferential direction. The cylindrical member,
The sandwich molded product is made of a core layer resin and a skin layer resin, and a gate position for injecting the core layer resin and the skin layer resin is provided at the end of the engaging portion, and the accessory mounting portion is made of the core layer resin. A lens barrel member characterized by being formed from chisel.