CN100368171C

CN100368171C - Metal mould for forming optical element and optical element forming product

Info

Publication number: CN100368171C
Application number: CNB031495974A
Authority: CN
Inventors: 野村健太郎; 福本启二
Original assignee: Canon Inc
Current assignee: Canon Inc
Priority date: 2002-07-18
Filing date: 2003-07-17
Publication date: 2008-02-13
Anticipated expiration: 2023-07-17
Also published as: JP4194426B2; JP2004098654A; CN1478641A

Abstract

To provide a die for molding an optical element capable of removing the optical element without deformation while controlling an enlargement in size of a device and cost increase. The die for molding the optical element is used in molding a resin-made optical element 1 having an optical function surface and a side face 1a surrounding the optical function surface. A die member 5 having a mirror section in forming the optical function surface and the side face 1a are molded. A slide member 2 is provided in a movable manner to allow the optical element to expand when the optical element is removed from the die member 5. (C)2004,JPO.

Description

Optical element forming metal mould and optical element formed products

Technical field

The optical element formed products that the present invention relates to the optical element forming metal mould and be shaped with this metal die.

Background technology

In the past, opening the described technology of flat 10-180819 communique as the Japanese Patent Application Publication spy is known by people, it is when the optical element demoulding of strip, since with two end faces of the optical element of optical function face approximate vertical among, carry out the demoulding earlier near surface, the mould outside, even because knockout press inhomogeneous makes stripper plate carry out the demoulding under the state of inclination, also can prevent the distortion of optical surface between each die cavity and in the die cavity.

But there is the increase of following the part number in the described mould structure of above-mentioned communique, the increase of the complicated Mold Making expense that produces of structure or the problems such as prolongation in the term of delivery.In addition, also exist increase owing to the appearance and size of mould and make the problem that existing equipment can't be suitable for.Especially, when the mold structure that above-mentioned communique is introduced is applied to the isometric bar shaped optical element of the lens of scanning optics, cause the appearance and size of mould to maximize easily.

Summary of the invention

The present invention obtains in view of above-mentioned problem in the past, and its purpose is: in the maximization and expense increase of restraining device, optical element is deformed just can finish the demoulding.

Achieve the goal in order to address the above problem, the 1st technical scheme of the present invention provides a kind of shaping to have the forming metal mould of the optical function face and the resinous optical element of the side of this optical function face of encirclement, it is characterized in that comprising: have the mold component of minute surface part, this minute surface above-mentioned optical function face that partly is used to be shaped; The slide unit of above-mentioned side is shaped; Be fixed on this slide unit and protrude in first constraint component of mold component; Be arranged on the hole on the mold component of accommodating this first constraint component; And retrain second constraint component that makes that above-mentioned slide unit moves along the direction with the stripping direction approximate horizontal; Wherein, above-mentioned slide unit moves along the direction with the stripping direction approximate horizontal, when making above-mentioned optical element from the above-mentioned mold component demoulding, allows the expansion of above-mentioned optical element.

Description of drawings

Fig. 1 is that the mould of a form of implementation of the present invention is the profile of section with the center of formed products.

Fig. 2 is when being illustrated in mold releasability shown in Figure 1, and formed products faces the figure of the state before the demoulding.

Fig. 3 is illustrated among Fig. 2 by push rod formed products to be carried out the demoulding, and makes the figure of the state after the firm demoulding of formed products.

Fig. 4 be Fig. 3 the A-A direction to view.

Fig. 5 is that expression is the profile of prism shaping dies of the photographic optical system of section with the center of formed products.

Fig. 6 is the perspective view that is used for the optical element formed products of laser scanning optical system.

Fig. 7 is the perspective view that is used for the prism of photographic optical system.

The specific embodiment

Below, to a form of implementation of the present invention, be elaborated with reference to accompanying drawing.

Fig. 1 is that the mould of a form of implementation of the present invention is the profile of section with the center of formed products, and expression can produce 1 inner chamber in the mould of a plurality of workpiece.The mould of present embodiment is to be used to be shaped the mould of optical element of laser scanning optical system as shown in Figure 6.

In the figure, label 1 is the optical element formed products as the lens in the scanning optics; The 2nd, be positioned at the slide unit on cast gate opposite, this slide unit is housed in the groove of removable side's template 7, can only vertically moving along formed products; The 3rd, be fixed on the slide unit 2, be used to retrain the motion of slide unit, make the slide unit can only be along the constraint component that vertically moves of formed products, this constraint component also can be protruded to removable side's template direction by slide unit, and its bossing is housed in the hole of removable side's template with matched in clearance; The 4th, moving of constraint slide unit 2 and constraint component that slide unit 2 is moved along the direction with the stripping direction approximate horizontal; 5,6th, formed products is formed and become the minute surface model of required form; The 7th, removable side's template; The 8th, fixing square template; 9,10,11st, push rod; 12,13rd, top board.

Fig. 1 closes fixing square template 8 and removable side's template 7, resin is injected to the die profile of cutting open in the center of formed products when inner chamber carries out cooling curing.In the figure, slide unit 2 offsets to fetch with the inboard inclined-plane 8a that fixes square template 8 by its outside inclined-plane 2a and positions.And, the amount of movement laterally of above-mentioned slide unit 2 is restricted by constraint component 3, be set at the swell increment that surpasses formed products 1, and when this amount of movement closes from reaching in fixing square template 8 and removable side's template 7, make the inboard inclined-plane 8a of fixing square template 8 and inclined-plane, the outside 2a of slide unit 2 not exceed attachable position range.In addition, along the amount of movement of slide unit 2 inboards and almost equal along the amount of movement in slide unit 2 outsides.

Profile when Fig. 2 is a mold releasability shown in Figure 1, Fig. 3 are the profiles when opening the firm demoulding of die forming product, Fig. 4 be Fig. 3 the A-A direction to view.

The butt of the inboard inclined-plane 8a of inclined-plane, outside 2a and fixing square template 8 carries out die sinking and becomes the state of Fig. 2 from the state of Fig. 1, owing to can move the bound slide unit 2 in position towards lateral direction.

Become the state of Fig. 3 from the state of Fig. 2, optical element formed products 1 is from minute surface model 4 demouldings of movable surface the time, and the stress that is subjected to from inner chamber obtains discharging, and makes formed products begin to expand.Follow expansion, slide unit 2 allows the expansion of optical element formed products 1 thus along the direction slip distance suitable with swell increment that formed products expands.In view of the above, when not being subjected to the demoulding because and the stress that produces of the surperficial 1a of stripping direction approximate vertical direction just may carry out the demoulding, just may provide and fully meet the desired the optical element formed products that optical function surface accuracy and optical function mask have good imaging performance.

Simultaneously, the present invention also is applicable to prism such square lens or the round lens of Fig. 5 to photographic optical system shown in Figure 7 except the such strip optical element formed products of Fig. 1 scanning optics lens extremely shown in Figure 4.

As mentioned above, according to above-mentioned embodiment, when the demoulding, by slide unit movably along with the optical element formed products move the distance suitable with the perpendicular direction of stripping direction with swell increment, lip-deep distortion with the stripping direction approximate vertical is suppressed to Min., the optical element that satisfies desired optical property formed products can be provided.

In addition, relatively the mould before can be realized the reduction of components number, and also can the cutting down of manufacturing cost of these moulds followed in the simplification of structure.

Also have, follow the simplification of structure, can realize the miniaturization of the appearance and size of mould, and can be suitable for former device.

As mentioned above, according to above-mentioned form of implementation, in the increase or expense increase of restraining device, optical element is deformed just can carry out the demoulding.

Claims

1. optical element forming metal mould, the resinous optical element of the side with optical function face and this optical function face of encirclement of being used to be shaped is characterized in that, comprising:

Mold component with minute surface part, this minute surface above-mentioned optical function face that partly is used to be shaped;

The slide unit of above-mentioned side is shaped;

Be fixed on this slide unit and protrude in first constraint component of mold component;

Be arranged on the hole on the mold component of accommodating this first constraint component; And

Retrain second constraint component that makes that above-mentioned slide unit moves along the direction with the stripping direction approximate horizontal;

Wherein, above-mentioned slide unit moves along the direction with the stripping direction approximate horizontal, when making above-mentioned optical element from the above-mentioned mold component demoulding, allows the expansion of above-mentioned optical element.

2. optical element forming metal mould according to claim 1 is characterized in that:

The amount of movement of above-mentioned slide unit is constrained to by above-mentioned first constraint component, more than or equal to the swell increment of optical element, and when fixing square template and removable side's template are closed, does not exceed the attachable scope of mold component and slide unit.

3. optical element forming metal mould according to claim 1 is characterized in that: the formed products of described optical element is the lens of scanning optics.

4. optical element forming metal mould according to claim 1 is characterized in that: the formed products of described optical element is the prism of photographic optical system.