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Патент USA US2407280

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Sept. 10,1946.
7
MHYMAMR "
-
, 2,407,280‘
’ MOLD FOR USE IN THE MANUFACTURE OF OPTICAL ELEMENTS
Filed Sept. v2, 1942v
‘
“
‘
BY
‘
IN\%ILOR.
m
2,407,280
Patented Sept. 10, 1946
211407.280‘; ‘
‘ MoL-D’FoRZUsEtN'?HE
JI'FAGTUREJoFW
OPTICAIJFELEMENTS‘K
@SSiE?QiIiW-Q .
Mat
Po amidConpora' CambridgcoWlS$¥
on; Cambridge, Mass.,-,a.cor-.
pit'ratiaa.or'nelawareg
Application‘S'eptEmbeirZ, 19dgltserial<N6£>45?§031ir
' sic'laini'se (01. 1893911..
This invention relates-9 can:improvedwmoldzfori
usein themanufactureiof: optical elements formed;
of. polymerized? synthetic. plasti'ospresinsr and :like:
materials.v .
;
surfaces; which cantheyrepeatedlyi'reeused, and?
thesei'elements ‘P should- preferablyyv be~~bonded~ itoe ‘i
gether and maintained :inliproper'position :bye m
adhesive. or : aicementéwhichtmay;‘be-readilygape
An object of the inventionisrtotprovideza mold;
temperatures to‘ Which'tthe ‘moldsv are“ ’ subjected-r.
ofithe; character? describediscomprising a. plurality
of. elements having;opticallysmooth molding sure ‘
facesand. a water-soluble: cement for sealingstlieis
during‘athe-polymerization'ofthe:plastic/material“~
therein. With plastic'materialsrof .therclass-‘heree “
tofore described polymerizatiomtenrpe'rature‘siarea
ingi them. ?xedly-‘in 'position'» during thertmoldin‘g 10.. preferably maintained not greatlje irr'excess‘roftgo
joints; between; said imoldinggelement‘s : 811d~§h01de
process.<
degrees-0..
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.
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Another.v obj ecteofyi the :inyention qis‘ 'theeprovih: sion of a water-solubl wcementwhichis resistant.
to temperatures at: which the polymerization
process takes place.
Other objects of the invention will in part be
obvious and will in part appear hereinafter.
The invention accordingly comprises the prod
uct possessing the features, properties and rela
Thiseinvention contem ilategthe-userof:aewatere ‘
soluble rand-J51‘ preferably; a"! refractory cementli as: 1
the material employedi-in sealing and- bonding to?)
15 gether the mold walls.
The mold may be assem
bled by placing the glass wall elements in a suit
able J'i'g, and while they are held in position in
the jig, for example by leaf springs or other
means, they are sealed along their adjacent edges
and cemented together by applying thereto the
tion of elements which will be exempli?ed in the
preferred adhesive or cement in the form of a
following detailed disclosure and the scope of the
thick paste. The cement may then be rapidly
application of which will be indicated in the
dried and it quickly sets and hardens.
claims.
The drawing illustrates in perspective a por
For a fuller understanding of the invention
reference should be had to the following detailed 25 tion of a mold for use in themanufacture of
prisms. The mold walls ID are shown as made
description, taken in connection with the accom
of glass, the preferred material, and they are
panying drawing, which represents partially in
bonded together and held in position by the water
perspective and partially in section one embodi
soluble cement [2. A bottom plate I4 is also held
ment of the invention.
There is today a pressing demand for large 30 in position by the cement I2.
A preferred material for use as the bonding
quantities of optical elements, ‘such as prisms,
material in the present invention is the refractory
lenses and the like. This invention is concerned
water-soluble cement sold under the trade name
with the provision of molds adapted for use in
“Insalute.” Other suitable cements may be em
the production of such elements from synthetic
plastic or resinous materials which are introduced 35 ployed. For example, a mixture of sodium sili
cate with a suitable ?ller, such as wood flour,
into the mold in a partially polymerized or mono
pumice or the like has been found satisfactory.
meric state and then polymerized substantially
In this instance the ?ller acts primarily to prevent
completely and until they form hard, transparent
shrinkage of the sodium silicate as it hardens in
optical elements. Materials which have been
found particularly useful in the production of 40 contact with the mold walls and thus prevents
such molded plastic optical elements are cyclo
strain and distortion thereof. Either of the ce
hexyl methacrylate, styrene, methyl methacrylate,
ments described may be removed readily from the
and similar materials.
‘
‘
molds after the polymerization of the plastic
A considerable percentage of the cost of the
therein has been completed by immersing the
molded optical element resides in the cost of the 45 mold in water, as the cements are water-soluble.
mold. The light-transmitting surfaces of the ele
It is to be understood that other water-soluble
ment are preferably molded in contact with
cements which are adapted to withstand the
glass elements having optically smooth surfaces.
molding temperatures may be used, and all such
and these are expensive. It will be apparent that
in the production of large quantities of molded 50 cements are to be deemed as falling within the
scope of the invention.
’
optical elements it is highly desirable that the
It should perhaps be pointed out that with the
mold may be readily and rapidly assembled and
use of water-soluble cements as bonding mate
that it should be easily removed from the ?nished
rials in molds employed for the purpose de
article. It should comprise elements, and par
scribed, a preferred plastic material for use in
ticularly those elements having optically smooth
2,407,280
4
connection with the production of the molded
optical elements is one which shows very little
substantially optically smooth, and a water-solu
ble cement bonding said walls together and com
water absorption when polymerized, and cyclo
prising sodium silicate.
hexyl methacrylate is to be preferred in this
connection, as its water-solubility in the sub
2. A mold for use in the formation of an op
tical element of polymerized synthetic plastic
material or the like, comprising, in combination,
a plurality of mold walls having molding sur
faces substantially optically smooth, and a water
soluble cement bonding said walls together and
stantially completely polymerized state is ex
tremely low. Other materials which may be
satisfactorily employed in the production of
molded optical elements in the manner described,
and which are to be preferred when molds em
bodying‘the present invention are employed, be
cause of the low water absorption of their poly
mers, are styrene, homologues of styrene, methyl
10 comprising sodium silicate and a ?ller.‘
3. Amold for use in the formation of an opti
cal element of polymerized synthetic plastic ma
terial or the like, comprising, in combination, a
cyclohexyl methacrylate, menthyl methacrylate,
‘plurality of mold walls having molding surfaces
phenyl methacrylate and homologues of phenyl 15 substantially optically smooth, and a water-solu
methacrylate.
ble cement bonding said walls together, said
Since certain changes may be made in the
cement comprising also a water-insoluble ?ller.
above product and different embodiments of the
invention could be made without departing from
its scope, it is intended that all matter contained 20
in the above description or shown in the accom
panying drawing shall be interpreted as illus
trative and not in a limiting sense.
It is also to be understood that the following
claims are intended to cover all the generic and
4. A mold for use in the formation of an opti
cal prism of polymerized synthetic plastic mate
rial or the like, comprising, in combination, a
plurality of glass mold walls forming a pris
matic mold cavity and having molding surfaces
substantially optically smooth, and a water-solu
ble cement bonding said walls together and com
prising sodium silicate.
speci?c features of the invention herein de 26
5. A mold for use in the formation of an opti
scribed, and all statements of the scope of the
cal prism of polymerized synthetic plastic mate
invention which, as a matter of language, might
rial or the like, comprising, in combination, a
be said to fall therebetween.
plurality of glass mold walls forming a prismatic
What is claimed is:
30 mold cavity and having molding surfaces sub
1. A mold for use in the formation of an opti
stantially optically smooth, and a water-soluble
cal element of polymerized synthetic plastic ma
cement bonding said walls together and compris
terial or the like, comprising, in combination, a
ing sodium silicate and a ?ller.
plurality of mold walls having molding surfaces
-
MARK HYMAN, JR.
Certi?cate of Correction
Patent No. 2,407,280.
'
September 10, 1946.
MARK HYMAN, JR.
It is hereby certi?ed that error appears in the printed speci?cation of the above
numbered patent requiring correction as follows: Column 4, line 33, after “?ller.”
and before the signature to the speci?cation insert the following claim
6. A mold for use in the formation of an optical element of poly
merized synthetic plastic material or the like, comprising, in combina
tion, a plurality of mold walls having molding surfaces substantially
optically smooth, and a water-soluble cement bondin said walls
together, said cement comprising also a water-insolub e ?ller and
showing substantially no contraction upon hardening.
and in the heading to the printed speci?cation, line 8, for “5 claims” read 6‘ claims;
and that the said Letters Patent should be read with this correction therein that the
same may conform to the record of the case in'the Patent Of?ce.
Signed and sealed this 22nd day of July, A. D. 1947.
[Hm-1
LESLIE FRAZER,
“We
‘
i
_
First Assistant Oommissz'omwofPatents.
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