CN103676063A - Lens for pick-up device, lens unit and lens molding die - Google Patents
Lens for pick-up device, lens unit and lens molding die Download PDFInfo
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- CN103676063A CN103676063A CN201310415007.5A CN201310415007A CN103676063A CN 103676063 A CN103676063 A CN 103676063A CN 201310415007 A CN201310415007 A CN 201310415007A CN 103676063 A CN103676063 A CN 103676063A
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Abstract
The invention provides a lens for a pick-up device, wherein the lens can be correctly mounted on a lens holder of any type without removing burrs. The lens for the pick-up device comprises a lens part provided with a first lens surface and a second lens surface, and a flange part protruding from the edge of the lens part. The flange part comprises a first plane part formed on one end surface of the flange part to surround any one out of the first lens surface and the second lens surface; a second plane part formed to surround the first plane part; a third plane part formed to surround the second plane part, a first burr forming part formed on the outer peripheral surface of the flange part at a predetermined distance away from the end surface of the flange part; and a second burr forming part formed at the boundaries of the first and second plane parts. The second plane part and the third plane part are formed to be closer to the other end surface of the flange part relative to the first plane part.
Description
Technical field
The present invention relates to a kind of resinous lens for pick device, there is this pick device with the lens unit of lens and utilize ejection formation to form the lens mold for forming of lens for this pick device.
Background technology
From the CD drive of the disc reading information such as CD, DVD, have pick device, this pick device comprises: the laser that at least one LASER Light Source and making penetrates from LASER Light Source converges at the lens of CD.
Lens in pick device, the synthetic resin normally being formed by ejection formation, such lens, for example, shown in the open JP2011-233194A communique (being called patent documentation 2 below) of the open JP2011-183596A communique (being called patent documentation 1 below) of Japanese patent of invention and Japanese patent of invention.
The lens of patent documentation 1 have the roughly discoidal lip portions that protrudes bead shape from lens outer rim, have the installed surface of planar annular in the lip portions of the first lens face side of the light incident from LASER Light Source.This installed surface loads in the maintenance face of lens fixture, and the corner injection bonding agent at installed surface, is fixed on lens fixture by lens.In the installation method of this lens, by making the installed surface of lens and the maintenance face of lens fixture contact positioning lens, therefore require the installed surface of lens to there is very high plane precision, when designing mould, need to not make the installed surface generation burr (mold flash) of lens etc.
The lens of recording in the lens of patent documentation 2 and patent documentation 1 are same, also have the roughly discoidal lip portions that protrudes bead shape from lens outer rim.This lip portions loads the dip plane (circular cone table top) in lens fixture, after carrying out the tilt adjustments of lens, injects bonding agent, and lens are fixed on to lens fixture between the outer peripheral face of lip portions and lens fixture.In the installation method of this lens, owing to will making the lip portions of lens slide and carry out the position adjustment of lens with respect to the dip plane of lens fixture, therefore when designing mould, also need not make the corner (with the contact site of lens fixture dip plane) of lens lip portions that burr etc. occur.
Summary of the invention
In prior art, according to the specification of pick device, adopt the installation method of two kinds of lens, from manufacturing the aspect of lens, need to prepare a plurality of moulds for the lens of identical optical specification, therefore, in order to enhance productivity, need to use a mould to obtain tackling the lens of the shape of two kinds of installation methods.
The present invention is because the problems referred to above,, the object of the present invention is to provide a kind of burr that produce needn't remove moulding time that is, and has the pick device lens of the shape of the installation method that can tackle above-mentioned two kinds of lens; There is the lens unit of lens for this pick device; And for form the lens mold for forming of lens for this pick device by ejection formation.
In order to achieve the above object, resinous pick device lens of the present invention, is characterized in that having: lens section, it is formed with respectively the first lens face of the light incident of the provision wavelengths penetrating from light source at tow sides, and makes to incide the second lens face of the light outgoing of this first lens face; And lip portions, from lens section edge, protrude bead shape, be roughly disc; Lip portions has: the first planar portions, and it is the ring plain substantially vertical with the optical axis of lens section, around the periphery of either party in first lens face and the second lens face and be formed at a square end face of lip portions; The second planar portions, it is the ring plain substantially vertical with the optical axis of lens section, around the periphery of the first planar portions; The 3rd planar portions, it is the ring plain substantially vertical with the optical axis of lens section, around the periphery of the second planar portions; The first burr forming portion, it is along being circumferentially formed on the outer peripheral face of lip portions, from the end of a square end face side of lip portions towards the end of the opposing party's end face side, leave the position of predetermined distance; With the second burr forming portion, it is formed at the boundary portion of the second planar portions and the 3rd planar portions, the second planar portions and the 3rd planar portions are formed at the opposing party's end face side by lip portions than the first planar portions, so that the burr that the second burr forming portion produces can not protrude from the first planar portions.
According to said structure, can provide a kind of, because burr can not produce burr in the outer edge of the first planar portions and lip portions, and can be installed on the pick device lens of the lens fixture of above-mentioned arbitrary kind.
Preferably the second planar portions and the 3rd planar portions are formed at position roughly the same on optical axis direction.
In addition, preferably the second planar portions is formed at the opposing party's end face side by lip portions than the 3rd planar portions, and lip portions has the first difference in height portion along the second burr forming portion.According to said structure, make the dimensionally stable of lens for pick device, so ejection resistance is stable.
Preferably lip portions has the second difference in height portion along the first burr forming portion.According to said structure, make the dimensional stability of lens for pick device, so ejection resistance is also stable.
In addition, preferably predetermined distance is less than 1/2nd of a square end face of described lip portions and the distance between the opposing party's end face.According to said structure, can make with moulding first lens face and the second lens face in any one and be assigned to the ejection resistance of the mould of this person's face, with in moulding first lens face and the second lens face, appoint another one and with the ejection resistance of the surperficial mould of this another one, so easy demoulding of lens.
Preferably a square end face of lip portions is the end face of first lens face side.
On the other hand, lens unit of the present invention is characterised in that to have arbitrary pick device lens as mentioned above; With the lens fixture that keeps this pick device with lens, lens fixture is the plate-shaped member that is formed with through hole, has with the first planar portions contact, for locating pick device, with the lens of lens, keep face in the periphery of this through hole.According to said lens unit, pick device accurately can be positioned on lens fixture with lens.
In addition, lens unit of the present invention can also be to have arbitrary pick device lens as mentioned above; With the lens fixture that keeps this pick device with lens, lens fixture is the plate-shaped member that is formed with through hole, the inner peripheral surface of this through hole is the dip plane that can contact with the end of a square end face side of lip portions, lens unit has tilt adjusting unit, this tilt adjusting unit is by being slided with respect to dip plane in the end of a square end face side of lip portions, so that pick device is adjusted with the inclination of lens.Now, be preferably, the angle of inclination that makes dip plane is α
0, the pick device that tilt adjusting unit can be adjusted is α with the angle of inclination of lens
1, the burr height producing at the first burr forming portion place is Tb
1, the burr height producing at the second burr forming portion place is Tb
2, the thickness of lip portions on optical axis direction is Df, from the end of a square end face side of lip portions to the distance L b of the first burr forming portion
1, and from the end of a square end face side of lip portions to the distance L b of the second burr forming portion
2, meet following formula (1), (2).
[formula (1)]
[formula (2)]
On the other hand, lens mold for forming of the present invention is for forming resin lens by ejection formation, these resin lens have the lens section that is formed with respectively first lens face and the second lens face at tow sides, with from described lens section edge, protrude bead shape, form the roughly resin lens of discoidal lip portions, described lens mold for forming is characterised in that, comprise, first and second mold in the plane of the optical axis perpendicular to described lens section with spue line face, described the first mold has the first internal mold of column, it is for first lens face described in moulding and described the second lens face either party, the first planar portions, it is the ring plain substantially vertical with the optical axis of described lens section, around in described first lens face and described the second lens face any one periphery and be formed at described lip portions, with the second planar portions, it is the ring plain substantially vertical with the optical axis of described lens section, the position of any another one side in leaning on described first lens face and described the second lens face than described the first planar portions, around the periphery of described the first planar portions and be formed at described lip portions, and first external mold, it covers the side of described the first internal mold and forms tubular, for moulding the 3rd planar portions, it is the ring plain substantially vertical with the optical axis of described lens section, be arranged in than described the first planar portions and appoint another one side by described first lens face and described the second lens face, around the periphery of described the second planar portions and be formed at described lip portions, with a part for the outer peripheral face of described lip portions, described the second mold has the forming lens portion that appoints the opposing party for first lens face described in moulding and described the second lens face, and for the bead forming section of the part of lip portions outer peripheral face described in moulding.
As mentioned above, according to the present invention, can provide a kind of burr that produce in the time that moulding needn't being removed that have, the pick device lens that just can tackle the shape of above-mentioned two kinds of lens installation methods.A kind of lens unit of lens for above-mentioned pick device that has is provided, and for form the lens mold for forming of lens for pick device by ejection formation.
Accompanying drawing explanation
Fig. 1 is for being equipped on the lens of embodiment of the present invention the sectional view of pick device.
Fig. 2 is the lens of embodiment of the present invention and the sectional view of lens mold for forming.
Fig. 3 is the enlarged drawing of the A part of Fig. 2.
Fig. 4 is for for illustrating the figure of relation between the burr forming portion position of lens of embodiment of the present invention and the dip plane of lens fixture.
Fig. 5 is the lens of the first variation and the sectional view of lens mold for forming.
Fig. 6 is the lens of the second variation and the sectional view of lens mold for forming.
Embodiment
Use accompanying drawing to describe embodiment of the present invention below.
Fig. 1 is for being equipped on the lens of embodiment of the present invention the sectional view of pick device.The pick device 100 of present embodiment is for to being recorded in that the data of CD (not shown) read or to video disc recording data, lens 1 be fixed on lens fixture 110 or 110 in pick device 100 '.The sectional view of Fig. 1 (a) represents lens 1 to be equipped on, be formed with the situation with the lens fixture 110 of installed surface (the first planar portions) the 11 maintenance faces that contact 111 of lens 1, the sectional view of Fig. 1 (b) represents lens 1 to be equipped on, and is formed with the dip plane 113(circular cone table top contacting with the lip portions 1b of lens 1) lens fixture 110 ' situation.As shown in Fig. 1 (a), lens fixture 110 is plate-shaped members, is formed with for holding the through hole 112 of the first lens face R1 of lens 1, is formed with the maintenance face 111 of the planar annular vertical with the optical axis AX of lens 1 in the surrounding of through hole 112 upside peristomes.As shown in Fig. 1 (b), lens fixture 110 ' be plate-shaped member, be formed with through hole 112 ', through hole 112 ' inner peripheral surface be the dip plane 113 contacting with the lip portions 1b of lens 1.
As shown in Fig. 1 (a) and Fig. 1 (b), lens 1 have: at a side surface (downside in figure), be provided with first lens face R1, be provided with the lens section 1a of the second lens face R2 on opposite side surface (upside in figure); With from lens section 1a edge, protrude roughly discoidal lip portions 1b.First lens face R1 and the second lens face R2 are convex surface, and lens 1 play the effect of convex lens.
In pick device 100, make the laser incident lens 1 that send from LASER Light Source (not shown), to CD, irradiate the laser being converged by lens 1.When reading the data that are recorded in CD, after laser reflects on CD, through lens 1, inject the photoelectric detector (not shown) of pick device 100.That is, at the laser by CD reflection, finally by photoelectric detector, read.The LASER Light Source of pick device 100 and photoelectric detector are arranged at first lens face R1 side, and CD is positioned at the second lens face R2 side.
For exactly, from disc reading data or exactly to video disc recording data, wish to make lens 1(the second lens face R2) with the near distance of CD, wish to make the focal length of lens 1 little.In the present embodiment, by making the projection of first lens face R1 compared with large (, make the radius-of-curvature of first lens face R1 little), increase optics of lens function, thus make the focal position of lens 1 extremely approach the second lens face R2.
In the first lens face R1 of lip portions 1b side, around the periphery of first lens face R1, be formed with the first planar portions 11 of the planar annular vertical with the optical axis AX of lens 1.When lens 1 are equipped on to the lens fixture 110 of the maintenance face 111 that is formed with plane as shown in Fig. 1 (a), the first planar portions 11 of lens 1 is equipped on the maintenance face 111 of lens fixture 110, then, by the corner of the lip portions 1b of adhesive A b injection lens 1 (, gap between lip portions 1b and lens fixture 110), thus lens 1 are fixed on to fixator 110.
In the first lens face R1 of lip portions 1b side, around the periphery of the first planar portions 11, be formed with the second planar portions 12 of the planar annular substantially vertical with the optical axis AX of lens 1, in addition, around the periphery of the second planar portions 12, be formed with the 3rd planar portions 13 of the planar annular substantially vertical with the optical axis AX of lens 1.To this, be elaborated in the back, in the present embodiment, the second planar portions 12 and the 3rd planar portions 13 are formed at roughly the same position in the optical axis AX of lens 1 direction.The second planar portions 12 and the 3rd planar portions 13 are formed at than the first planar portions 11 and lean on the second lens face R2 side, form the difference in height d(of specified altitude as described later between the first planar portions 11 and the second planar portions 12).Lens 1 are equipped on be formed with the lens fixture 110 of dip plane 113 shown in Fig. 1 (b) ' situation under, lens 1 are being installed on to 110 ' time of lens fixture, the outer edge of the 3rd planar portions 13 (, the outer edge 1bc of lip portions 1b) is equipped on dip plane 113(contact condition).Afterwards, under this state, for example by use, adjust the regulation position that pin is pressed the second lens face R2 side of lip portions 1b, carry out the tilt adjustments of lens 1, so that the optical axis AX of lens 1 is vertical with respect to CD, at the outer edge 1bc(that adhesive A b is injected to the lip portions 1b of lens 1, be the gap between lip portions 1b and lens fixture 110), make thus lens 1 be fixed on fixator 110 '.In the lens 1 of present embodiment, in the second lens face R2 side of lip portions 1b, be formed with the tilt detection face 14 of the planar annular vertical with the optical axis AX of lens 1.By penetrating directional light to tilt detection face 14, and monitor that its reflected light carries out lens 1 tilt adjustments.Due on the books in patent documentation 2 for example, so in this instructions, omit the detailed description to lens 1 tilt adjustments.
As mentioned above, the lens 1 of present embodiment, have the first planar portions 11; With the second planar portions 12 and the 3rd planar portions 13 that form than first planar portions 11 deflection the second lens face R2 sides, it can be equipped on the lens fixture 110 that is formed with maintenance face 111 shown in Fig. 1 (a), also can be equipped on the lens fixture 110 that is formed with dip plane 113 shown in Fig. 1 (b) '.In addition, to this, will describe in detail in the back, the lens 1 of present embodiment do not produce burr at the first planar portions 11 places, and do not produce burr at the outer edge of lip portions 1b 1bc yet.Therefore, needn't remove burr removing, just lens 1 can be equipped on said lens fixator 110 or 110 ' any one.
Below, to the mould of lens 1 and use the lens forming method that this mould forms to describe.In the present embodiment, lens 1 are plastics, by ejection formation, manufacture.The lens 1 of present embodiment and for the die profile of molded lens 1 as shown in Figures 2 and 3.Fig. 3 is the enlarged drawing of the A part of Fig. 2.
As shown in Figure 2, the mould 200 for molded lens 1 has fixed side mold portion 210 and drawer at movable side mold 220.Fixed side mold portion 210 has external mold (left side) 211 and internal mold (left side) 212.External mold (left side) 211 arranges porose 211a, and internal mold (left side) 212 is housed inside the hole 211a of external mold (left side) 211 and is fixed.Drawer at movable side mold 220 has external mold (right side) 221 and internal mold (right side) 222.External mold (right side) 221 arranges porose 221a, and internal mold (right side) 222 is contained in the hole 221a of external mold (right side) 221 and is fixed.The end face 221e of the end face 211e of external mold (left side) 211 and external mold (right side) 221 is the plane vertical with the optical axis AX of lens 1, is the spue line face (PL face) of fixed side mold portion 210 and drawer at movable side mold 220.That is, drawer at movable side mold 220 can move along optical axis AX relative to fixed side mold portion 210, and molded lens 1 is carried out in the space that utilizes the end face 211e of external mold (left side) 211 and the end face 221e of external mold (right side) 221 to dock mutually formation.
At internal mold (left side) 212, be formed for the recess 212a of the first lens face R1 of molded lens 1, for the planar portions 212b of moulding the first planar portions 11 and for planar portions 212c(Fig. 3 of moulding the second planar portions 12).At internal mold (right side) 222, be formed for molded lens 1 the second lens face R2 recess 222a and for the planar portions 222b of moulding tilt detection face 14.
At external mold (left side) 211, be formed with, for the planar portions 211b of moulding the 3rd planar portions 13; Barrel surface 211c with the part (part for first lens face R1 side) of outer peripheral face for moulding lip portions 1b.In the present embodiment, the junction surface between barrel surface 211 and planar portions 211b (that is, the outer edge 1bc of lip portions 1b) forms approximate right angle.At external mold (right side) 221, be formed with the barrel surface 221c for an outer peripheral face part (part for the second lens face R2 side) of moulding lip portions 1b; Planar portions 221b with the end of the second lens face R2 side for moulding lip portions 1b.In the present embodiment, by the outer peripheral face of the lip portions 1b of external mold (left side) 211 moulding with by the outer peripheral face of the lip portions 1b of external mold (right side) 221 moulding, be connected to roughly the same face.
The inner peripheral surface of the hole 221a of the inner peripheral surface of the hole 211a of external mold (left side) 211 and external mold (right side) 221 is the barrel surface centered by optical axis AX.Internal mold (left side) 212 is being installed on to hole 211a, and internal mold (right side) 222 is installed under the state of hole 221a, utilize hole 211a and 221a, to internal mold (left side) 212 and internal mold (right side) 222, with hi-Fix, make the recess 212a of internal mold (left side) 212 and the recess 222a of internal mold (right side) 222 be installed on the center of external mold (left side) 211 and external mold (right side) 221.Consequently, can make the optical axis of first lens face R1 of the lens 1 after moulding and the optical axis of the second lens face R2 consistent with high precision.
Because lens 1 mold for forming 200 of present embodiment is combined by external mold and internal mold as mentioned above, therefore when to the inner resin by injection molded lens 1 of mould 200, the gap of the gap of resin inflow external mold (left side) 211 and internal mold (left side) 212, external mold (right side) 221 and internal mold (right side) 222 and the gap of external mold (left side) 211 and external mold (right side) 221 are (, the gap of PL face), make lens 1 produce burr.When lens 1 produce burr, because of position and the amount (highly) of these burr, can cause obstruction (, impact) lens 1 being installed on to 110 or 110 ' time of said lens fixator.For example, when the first planar portions 11 at lens 1 produces under the situation of burr, when the lens fixture 110 of lens 1 and the maintenance face that is formed with 111 as shown in above-mentioned Fig. 1 (a) is assembled, lens 1 can be installed in lens fixture 110 to lift from maintenance face 111 with the corresponding amount of burr.Therefore, there are the following problems,, because lens 1 tilt to produce aberration, causes optical performance degradation, or, because lens 1 do not contact completely with datum clamp face (maintenance face 111), and make adhesive strength deteriorates.When the outer edge 1bc at lip portions 1b produces under the situation of burr, lens 1 are being installed on to the 110 ' time of lens fixture that is formed with dip plane 113 shown in Fig. 1 (b), have to the state that contacts with dip plane 113 at burr (, lens 1 and lens fixture 110 ' between the larger state of friction force) under carry out the tilt adjustments of lens 1, so lens 1 tilt adjustments difficulty.And in the present embodiment, although lens 1 produce burr, the mould 200 of this structure make burr be formed at not can with the position of said lens fixator 110 or 110 ' interfere.
As shown in Figure 3, the PL face of the mould 200 of present embodiment is arranged in the first lens face R1 side (figure left side) of lip portions 1b outer peripheral face.Therefore, at the lip portions 1b of lens 1 outer peripheral face (burr forming portion B1), form burr.The die joint (gap) of external mold (left side) 211 and internal mold (left side) 212 is the border of the second planar portions 12 and the 3rd planar portions 13.Therefore, the boundary portion (burr forming portion B2) in the second planar portions 12 and the 3rd planar portions 13 forms burr.The die joint (gap) of external mold (right side) 221 and internal mold (right side) 222 is positioned at the outside of tilt detection face 14.Therefore, the outside of tilt detection face 14 (burr forming portion B3) forms burr.
That is, mould 200 configuration die joint and the PL faces to present embodiment, so that burr forming portion B1 and B2 are positioned at the position of avoiding the first planar portions 11 of lens 1 and the outer edge 1bc of lip portions 1b.Therefore, as mentioned above, the burr that lens 1 produce not can with said lens fixator 110 or 110 ' interfere, even if needn't remove burr removing, also lens 1 can be equipped on said lens fixator 110 or 110 ' any one.
Fig. 4 be for illustrate the burr forming portion B1 of lens 1 of present embodiment and the position of B2 and lens fixture 110 ' dip plane 113 between the figure of relation.As shown in Figure 4, making the distance between the burr forming portion B1 of present embodiment and the outer edge 1bc of lip portions 1b is distance L b
1, the distance between burr forming portion B2 and the outer edge 1bc of lip portions 1b is distance L b
2, distance L b
1and Lb
2meet following formula (1) and formula (2).
[formula 1]
[formula 2]
At this, α
0represent said lens fixator 110 ' the angle of inclination (perpendicular to plane and dip plane 113 angulations of optical axis AX) of dip plane 113, in the present embodiment, the angle of inclination of supposing dip plane 113 is 30 °～60 °.α
1the tilt adjustments angle that represents lens 1, in the present embodiment, with α
0for benchmark, be set as in the scope of ± 15 °, adjusting.Tb
1and Tb
2represent the generating capacity (highly) of the burr that each burr forming portion B1 and B2 produce, in the present embodiment, suppose that burr height is 0～0.03mm.Df represents the length (thickness) of lip portions 1b outer peripheral face.
The burr that produce as burr forming portion B1 meet formula (1), when the burr that burr forming portion B2 produces meet formula (2), except just can being installed on lens 1, burr removing do not there is the lens fixture 110 that angle of inclination is the dip plane 113 of 30 °～60 ° ', preferred distance Lb
1and Lb
2be greater than each height Tb
1and Tb
20.6 times.
For example, as long as the difference in height d between setting the first planar portions 11 and the first planar portions 11 and the second planar portions 12 is greater than the burr height (0.03mm) of burr forming portion B2, so that be created in the burr at burr forming portion B2 place, be no more than the first planar portions 11, just can positively make the first planar portions of lens 1 and the maintenance face 111 of said lens fixator 110 contact and install.In above-mentioned formula (1), PL face is arranged to first lens face R1 side and (that is, is attached with Lb
1the condition of≤Df ∕ 2), during with lens 1 after taking out moulding, make it be stranded in drawer at movable side mold 220 sides, but as long as PL face is positioned at the outer peripheral face of lip portions 1b, can be arranged on any position (that is, burr forming portion B1 can be arranged to the optional position of the outer peripheral face of lip portions 1b).
Above embodiments of the present invention are illustrated, the present invention is not limited in above-mentioned embodiment, can carry out various changes not departing from the scope of the inventive concept.For example, in present embodiment, in the first lens face R1 of lip portions 1b side, form the first planar portions 11, the second planar portions 12 and the 3rd planar portions 13, and the installed surface of formation and lens fixture 110, but also can form in the second lens face R2 side of lip portions 1b the first planar portions 11, the second planar portions 12 and the 3rd planar portions 13, make the second lens face R2 side down (that is, by the second lens face R2 side of lip portions 1b) be installed on lens fixture 110.Now, in the first lens face R1 of lip portions 1b side, form tilt detection face 14.
In the present embodiment, drawer at movable side mold 220 for moulding the second lens face R2 has external mold (right side) 221, internal mold (right side) 222, but be not to be divided into two moulds, for example, can make external mold (right side) 221 and internal mold (right side) 222 be configured to one yet.Now, in a drawer at movable side mold 220, form barrel surface 221c, planar portions 221b and recess 222a.
In the present embodiment, the second planar portions 12 and the 3rd planar portions 13 are formed at roughly the same position (that is, the second planar portions 12 and the 3rd planar portions 13 are formed at roughly on same plane) in the optical axis AX of lens 1 direction, but are not limited in this.Fig. 5 be present embodiment the first variation lens 1A and for the sectional view of the mould 200A of molded lens 1A.The lens 1A of this variation, make the second planar portions 12A be formed at than the 3rd planar portions 13 by this aspect of the second lens face R2 side (, planar portions 212c is formed at than planar portions 211b by this aspect of the second lens face R2 side), different from lens 1 and the mould 200 of present embodiment.When different in the position that makes the second planar portions 12A and the 3rd planar portions 13, can not make the second planar portions 12A more outstanding than the 3rd planar portions 13 because of condition of molding, or make the 3rd planar portions 13 to the second planar portions 12A outstanding, make lens 1A dimensionally stable, while therefore carrying out the demoulding after lens moulding, the ejection resistance of lens 1A (friction force producing between lens 1A and mould 200A) is stable.
In the present embodiment, make the outer peripheral face by the lip portions 1b of external mold (left side) 211 moulding, and be connected to form a roughly face by the outer peripheral face of the lip portions 1b of external mold (right side) 221 moulding, but be not limited in this.Fig. 6 be present embodiment the second variation lens 1B and for the sectional view of the mould 200B of molded lens 1B.In the lens 1B of this variation, on the outer peripheral face of lip portions 1b, form along in difference in height portion 16 this point of PL face, different from the lens 1A of the first variation.As mentioned above, while being formed with difference in height portion 16 on the outer peripheral face at lip portions 1b, can not make by the outer peripheral face of the lip portions 1b of external mold (left side) 211 moulding more outstanding than the outer peripheral face of the lip portions 1b by external mold (right side) 221 moulding, or make by the outer peripheral face of the lip portions 1b of external mold (right side) 221 moulding more outstandingly than the outer peripheral face of the lip portions 1b by external mold (left side) 211 moulding, make lens 1B dimensionally stable.In addition, in this variation, make by the outer peripheral face of the lip portions 1b of external mold (left side) 211 moulding lower than the outer peripheral face of the lip portions 1b by external mold (right side) 221 moulding, but also can make by the outer peripheral face of the lip portions 1b of external mold (left side) 211 moulding highlyer than the outer peripheral face of the lip portions 1b by external mold (right side) 221 moulding, can obtain same effect.
Claims (15)
1. resinous pick device lens, is characterized in that having:
Lens section, it is formed with respectively the first lens face of the light incident of the provision wavelengths penetrating from light source at tow sides, and makes to incide the second lens face of the light outgoing of this first lens face; With
Lip portions, protrudes bead shape from described lens section edge, is roughly disc;
Described lip portions has:
The first planar portions, it is the ring plain substantially vertical with the optical axis of described lens section, around the periphery of either party in described first lens face and described the second lens face and be formed at a square end face of described lip portions;
The second planar portions, it is the ring plain substantially vertical with the optical axis of described lens section, around the periphery of described the first planar portions;
The 3rd planar portions, it is the ring plain substantially vertical with the optical axis of described lens section, around the periphery of described the second planar portions;
The first burr forming portion, it is along being circumferentially formed on the outer peripheral face of described lip portions, from the end of a square end face side of described lip portions towards the end of the opposing party's end face side, leave the position of predetermined distance; With
The second burr forming portion, it is formed at the boundary portion of described the second planar portions and described the 3rd planar portions,
Described the second planar portions and described the 3rd planar portions are formed at the opposing party's end face side by described lip portions than described the first planar portions, so that the burr that described the second burr forming portion produces can not protrude from described the first planar portions.
2. pick device lens according to claim 1, is characterized in that,
Described the second planar portions and described the 3rd planar portions are formed at position roughly the same on optical axis direction.
3. pick device lens according to claim 1, is characterized in that,
Described the second planar portions is formed at the opposing party's end face side by described lip portions than described the 3rd planar portions, and described lip portions has the first difference in height portion along described the second burr forming portion.
4. pick device lens according to claim 1, is characterized in that,
Described lip portions has the second difference in height portion along described the first burr forming portion.
5. pick device lens according to claim 1, is characterized in that,
Described predetermined distance is less than 1/2nd of a square end face of described lip portions and the distance between the opposing party's end face.
6. pick device lens according to claim 1, is characterized in that,
One square end face of described lip portions is the end face of described first lens face side.
7. a lens unit, is characterized in that,
There are the pick device lens described in any one in claim 1～6; With the lens fixture that keeps this pick device with lens,
Described lens fixture is the plate-shaped member that is formed with through hole, has with described the first planar portions to contact, for locating described pick device, with the lens of lens, keep face in the periphery of this through hole.
8. a lens unit, is characterized in that,
There are the pick device lens described in any one in claim 1～6; With the lens fixture that keeps this pick device with lens,
Described lens fixture is the plate-shaped member that is formed with through hole, and the inner peripheral surface of this through hole is the dip plane that can contact with the end of a square end face side of described lip portions,
Described lens unit has tilt adjusting unit, and this tilt adjusting unit is by being slided with respect to described dip plane in the end of a square end face side of described lip portions, so that described pick device is adjusted with the inclination of lens.
9. lens unit according to claim 8, is characterized in that,
The angle of inclination that makes described dip plane is α
0, the described pick device that described tilt adjusting unit can be adjusted is α with the angle of inclination of lens
1, the burr height producing at described the first burr forming portion place is Tb
1, the burr height producing at described the second burr forming portion place is Tb
2, the thickness of described lip portions on optical axis direction is Df,
From the end of a square end face side of described lip portions to the distance L b of described the first burr forming portion
1, and from the end of a square end face side of described lip portions to the distance L b of described the second burr forming portion
2, meet following formula (1), (2).
[formula (1)]
[formula (2)]
10. a lens mold for forming, it is for forming resin lens by ejection formation, these resin lens have the lens section that is formed with respectively first lens face and the second lens face at tow sides, with from described lens section edge, protrude bead shape, form the roughly resin lens of discoidal lip portions, described lens mold for forming is characterised in that
Comprise in the plane of the optical axis perpendicular to described lens section, thering is first and second mold of spue line face,
Described the first mold has
The first internal mold of column, it is for moulding
Either party in described first lens face and described the second lens face,
The first planar portions, it is for the substantially vertical ring plain of the optical axis with described lens section, be formed at described lip portions around the periphery of any one in described first lens face and described the second lens face, and
The second planar portions, it is the ring plain substantially vertical with the optical axis of described lens section, than described the first planar portions by the position of another one side arbitrarily in described first lens face and described the second lens face, around the periphery of described the first planar portions, be formed at described lip portions
And
The first external mold, it covers the side of described the first internal mold and forms tubular, for moulding
The 3rd planar portions, it is the ring plain substantially vertical with the optical axis of described lens section, be arranged in than described the first planar portions and appoint another one side by described first lens face and described the second lens face, around the periphery of described the second planar portions, be formed at described lip portions; With
A part for the outer peripheral face of described lip portions,
Described the second mold has the forming lens portion that appoints the opposing party for first lens face described in moulding and described the second lens face, and for the bead forming section of the part of lip portions outer peripheral face described in moulding.
11. lens mold for forming according to claim 10, is characterized in that,
Described the second planar portions and described the 3rd planar portions are formed at position roughly the same on the optical axis direction of described lens section.
12. lens mold for forming according to claim 10, is characterized in that,
Described the second planar portions is formed at than described the 3rd planar portions by appointing the opposing party's one side in described first lens face and described the second lens face.
13. lens mold for forming according to claim 10, is characterized in that,
Height of formation is poor at the outer peripheral face of the described lip portions by described the first mold moulding and between by the outer peripheral face of the described lip portions of described the second mold moulding.
14. according to the lens mold for forming described in any one in claim 10～13, it is characterized in that,
Described the second mold comprises the second internal mold of the column with described lens forming part, and has described bead forming part, covers described the second internal mold side and forms the second external mold of tubular.
15. lens mold for forming according to claim 10, is characterized in that,
In described first lens face and described the second lens face, either party is described first lens face, and the opposing party is described the second lens face.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012202023A JP2014056632A (en) | 2012-09-13 | 2012-09-13 | Lens for pickup device, lens unit, and metal mold for molding lens |
| JP2012-202023 | 2012-09-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103676063A true CN103676063A (en) | 2014-03-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310415007.5A Pending CN103676063A (en) | 2012-09-13 | 2013-09-12 | Lens for pick-up device, lens unit and lens molding die |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2014056632A (en) |
| CN (1) | CN103676063A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5894370A (en) * | 1996-07-26 | 1999-04-13 | Asahi Kogaku Kogyo Kabushiki Kaisha | Inclination monitoring system |
| CN1362624A (en) * | 2000-12-28 | 2002-08-07 | 柯尼卡株式会社 | Optical element manufacturing method and its optical element |
| CN1532157A (en) * | 2003-03-25 | 2004-09-29 | ������������ʽ���� | Method for producing optical element with holding frame |
| JP2011206968A (en) * | 2010-03-29 | 2011-10-20 | Maxell Finetech Ltd | Resin lens and method for manufacturing resin lens |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61261015A (en) * | 1985-05-15 | 1986-11-19 | Hitachi Ltd | Plastic lens and its mold |
| JP3450659B2 (en) * | 1996-07-26 | 2003-09-29 | ペンタックス株式会社 | Optical system for adjusting the tilt of the objective lens |
| WO2008053692A1 (en) * | 2006-11-01 | 2008-05-08 | Konica Minolta Opto, Inc. | Optical element, resin molding metal die and optical element manufacturing method |
| JP5007556B2 (en) * | 2006-11-24 | 2012-08-22 | コニカミノルタアドバンストレイヤー株式会社 | Optical element manufacturing method |
| JP2008213397A (en) * | 2007-03-07 | 2008-09-18 | Konica Minolta Opto Inc | Resin molding mold, optical element and optical pickup apparatus |
| JP2011233194A (en) * | 2010-04-26 | 2011-11-17 | Hoya Corp | Lens unit and lens for pickup device |
-
2012
- 2012-09-13 JP JP2012202023A patent/JP2014056632A/en active Pending
-
2013
- 2013-09-12 CN CN201310415007.5A patent/CN103676063A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5894370A (en) * | 1996-07-26 | 1999-04-13 | Asahi Kogaku Kogyo Kabushiki Kaisha | Inclination monitoring system |
| CN1362624A (en) * | 2000-12-28 | 2002-08-07 | 柯尼卡株式会社 | Optical element manufacturing method and its optical element |
| CN1532157A (en) * | 2003-03-25 | 2004-09-29 | ������������ʽ���� | Method for producing optical element with holding frame |
| JP2011206968A (en) * | 2010-03-29 | 2011-10-20 | Maxell Finetech Ltd | Resin lens and method for manufacturing resin lens |
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|---|---|
| JP2014056632A (en) | 2014-03-27 |
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