US901659A - Method of making bifocal lenses. - Google Patents

Method of making bifocal lenses. Download PDF

Info

Publication number
US901659A
US901659A US41870408A US1908418704A US901659A US 901659 A US901659 A US 901659A US 41870408 A US41870408 A US 41870408A US 1908418704 A US1908418704 A US 1908418704A US 901659 A US901659 A US 901659A
Authority
US
United States
Prior art keywords
blanks
blank
heat
cavity
uniting
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.)
Expired - Lifetime
Application number
US41870408A
Inventor
Frederick A Stevens
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US41870408A priority Critical patent/US901659A/en
Application granted granted Critical
Publication of US901659A publication Critical patent/US901659A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00Re-forming shaped glass
    • C03B23/20Uniting glass pieces by fusing without substantial reshaping
    • C03B23/22Uniting glass lenses, e.g. forming bifocal lenses

Definitions

  • My invention relates to methods of uniting glass blanks, and is articularly adapted to the manufacture of bi-focal lenses.
  • Figure 1 is a plan view of a device or apparatus in con junction with which my process may be carried out, supporting two superimposed glass blanks intended to be operated upon.
  • Fig. 2 is a section on line m as of Fig. '1.
  • Fig. 3 a like section of the arts at a succeeding stage of construction. ig. 4, a similar section of the completed product.
  • Fig. 5, a section of a modified form of die taken upon the section indicated in Fig. 1.
  • v Fig. 6, a like section of another modified form of die and superimposed parts after the fusing process
  • Fig. 7, a similar section of the completed product made in conjunction with the modified form of die shown in Fig. 6.
  • My process is illustrated in this instance as performed upon two blanks intended for use in the construction of bi-focal lenses.
  • a metal block or die, A provided in its upper face with a cavity, a, shown in Figs. 2 and 3, as concave, from whose lowest oint is a vertical duct, B, extending into a arger openin C, which receives the end of a pipe, D, leac ing to an air pump, E.
  • a portion of the pipe, D isshown broken'away in" Figs. 2, 3, 5 and 6.
  • a plurality of ducts, B are shown.
  • the form of die cavity, a is desirable.
  • the die cavity, a may be annular or ofany desired outline best adaptedto use-in any par ticular class of work; furthermore, the number of the die cavities may be increased when desired, as in the case of'the manufacture of lenses having more; than two foe-1
  • the block, A referablyirestsina muflier, or has suflicient eat appliedthereto in any convenient manner to moderatel raise its temperature.
  • the method of uniting lens bla'nkswvhich consists in assembling the blanks one upon the other, rendering the assembled blanks plastic by subjecting them to heat, and bending the blanks transversely by atmospheric pressure.
  • the method of uniting lens blanks which T upon adie provided with a cavity beneath the blanks, and exhausting the air from the consists in assembling blanks one upon the other, the upper blank being fusible at a lower temperature than the lower blank, sub- "the cavity.
  • the method of uniting lens blanks which consists in assembling blanks of different refractive indiccs one n 3011 the. other, the upper blank being fusible at a lower degree of temperature than the lower blank, subjecting the blanks to heat to fuse the upper blank to the lower blank, reducing the united blanks to a plastic condition by heat, and bending the blanks transversely by atmospheric pressure.
  • the method of uniting lens blanks which consists in assembling the blanks one upon the other, subj ccting the assembled blanks to heat to fuse together their contacting surfaces, reducing the united blanks to a plastic condition by heat, placing the plastic blanks cavity to force the ma-teria-l of the blanks into 9.
  • the inethod of uniting lens blanks which consists in fixing in any convenient manner one lens blank upon another, placing the blanks upon a die provided with a cavity beneath the blanks, subjecting the blanks so positioned to heat to render the same plastic, and exhausting the. air from the cavity to force the material of the blanks into the cavity.

Description

F. A. STEVENS. METHOD OF MAKING BIPOGAL LENSES.
APPLICATION FILED MAR.2,1908.
9 Patented 0011.20, 1908.
FTE. 2
& m
B A A 5 E a,
- ,5 H515. .9 fl
WETN EEEEIES FI 7' INVENTUR. azmzcfipwmwt M @zmz iflwm ATTURNEY.
UNITED STATES FREDERICK A. STEVENS, OF PROVIDENCE, RHODE ISLAN- PATENTLOFFICE METHOD OF MAKING BIFOGAL LENSES.
Application filed March 2, 1908. Serial No. 418,704
Specification of Letters Patent.
" Patented. eta-1 20, eos.
the following is a specification.
My invention relates to methods of uniting glass blanks, and is articularly adapted to the manufacture of bi-focal lenses.
Heretofore, it has been customary to grind and fit the face of one or both blanks preparatory to uniting, and either cement or fuse one of these blanks into the ground surface of the other. The labor, skill, and expense involved in the grinding method is excessive; and the variety in surface and sectional contour of the embedded member is limited.
To the end essentially of overcoming the enumerated disadvantages, my invention consists in the steps and operationshereinafter set forth and pointed out in the claims.
In the accompanying drawings which constitute a part of this specification, Figure 1 is a plan view of a device or apparatus in con junction with which my process may be carried out, supporting two superimposed glass blanks intended to be operated upon. Fig. 2 is a section on line m as of Fig. '1. Fig. 3, a like section of the arts at a succeeding stage of construction. ig. 4, a similar section of the completed product. Fig. 5, a section of a modified form of die taken upon the section indicated in Fig. 1. v Fig. 6, a like section of another modified form of die and superimposed parts after the fusing process, and Fig. 7, a similar section of the completed product made in conjunction with the modified form of die shown in Fig. 6.
Like reference characters indicate like parts throughout the views.
My process is illustrated in this instance as performed upon two blanks intended for use in the construction of bi-focal lenses. In connection with my process, in this instance, is provided a metal block or die, A, provided in its upper face with a cavity, a, shown in Figs. 2 and 3, as concave, from whose lowest oint is a vertical duct, B, extending into a arger openin C, which receives the end of a pipe, D, leac ing to an air pump, E. A portion of the pipe, D, isshown broken'away in" Figs. 2, 3, 5 and 6. In Fig. 5, a plurality of ducts, B, are shown. In connection with the production of prismatic effects the form of die cavity, a, as shown-in Fig. 5, is desirable. In short, as will be later evident, the die cavity, a, may be annular or ofany desired outline best adaptedto use-in any par ticular class of work; furthermore, the number of the die cavities may be increased when desired, as in the case of'the manufacture of lenses having more; than two foe-1 The block, A, referablyirestsina muflier, or has suflicient eat appliedthereto in any convenient manner to moderatel raise its temperature. Y 1. My rocess, when? or 0 ed in con'unction wlth the describe. do es, is as follows: The two glass blanks, F and-G, intended for treatment are assembled one upon the other. The blank, G, being the u per. of the two. In this case, F re resents a ens blank, and G a smaller or auxi iary blank resting thereon, having a refractive index differing from that of blank, F, and fusible at a lower degree of temperature than the latter. It is some before being operated upon; in which case the temperature of the blanks may be raised sufficiently to fuse their contacting surfaces. It is referable, but not essential, that the blanks e allowed to cool before proceeding. The blanks thus assembled, with blank F below blank G, are subjected to sufplaced upon the block, A, whereupon the air is exhausted by pump, E, from the cavity, a, through the duct, B, and pipe, D, thereby forcing by atmospheric pressure or suction the compound blank down into the cavity as shown in Figs. 3 and 6. After cooling, the blanks thus welded are removed and their project-ing up er and lower faces ground to complete the esired lens.
What I claim is,
1. The method of uniting lens bla'nkswvhich consists in assembling the blanks one upon the other, rendering the assembled blanks plastic by subjecting them to heat, and bending the blanks transversely by atmospheric pressure.
2. The method of uniting lens blanks which consists in assembling blanks of different refractive indices one above the other, rendering the assembled blanks plastic by subjecting them to heat, and transversely bending the plastic blanks by atmos heric pressure.
3. The method of uniting ens blanks which consists in assembling the blanks one upon the other, subjecting the blanks to heat to ficient heat to render both blanks plastic, and
times desirable to unite the assembled blanks fuse together their contacting surfaces, reducing the united blanks to a plastic condition by heat, and bending the blanks transversely by atmospheric pressure.
4. The method of uniting lens blanks which consists in assembling blanks of different refractive indices one upon the other, subjecting the blanks to heat to fuse together their contacting surfaces, reducing the united blanks to a plastic condition by heat, and bending the blanks transversely by atmospheric pressure.
The method of uniting lens blanks which T upon adie provided with a cavity beneath the blanks, and exhausting the air from the consists in assembling blanks one upon the other, the upper blank being fusible at a lower temperature than the lower blank, sub- "the cavity.
jecting the blanks to heat sufficient to fuse the face of the upper blank to the face of the lower blank, reducing the united blanks to a plastic condition by heat, and bending the blanks transversely by atmospheric pressure.
6. The method of uniting lens blanks which consists in assembling blanks of different refractive indiccs one n 3011 the. other, the upper blank being fusible at a lower degree of temperature than the lower blank, subjecting the blanks to heat to fuse the upper blank to the lower blank, reducing the united blanks to a plastic condition by heat, and bending the blanks transversely by atmospheric pressure.
7. The method of uniting lens blanks which consists in superimposing one blank upon the other, reducing the blanks to a plastic condition by heat, placing the plastic blanks upon a die provided with a cavity beneath the blanks, and exhausting the air from the cavity to force the material of the blanks into the cavity.
S. The method of uniting lens blanks which consists in assembling the blanks one upon the other, subj ccting the assembled blanks to heat to fuse together their contacting surfaces, reducing the united blanks to a plastic condition by heat, placing the plastic blanks cavity to force the ma-teria-l of the blanks into 9. The inethod of uniting lens blanks which consists in fixing in any convenient manner one lens blank upon another, placing the blanks upon a die provided with a cavity beneath the blanks, subjecting the blanks so positioned to heat to render the same plastic, and exhausting the. air from the cavity to force the material of the blanks into the cavity.
In testimony whereof I have aliixed my signature in presence of two witnesses.
FREDERICK A. S'IEVENS. Witnesses:
l'IORATIO E. BELLows, JosnPn E. BnRNs.
US41870408A 1908-03-02 1908-03-02 Method of making bifocal lenses. Expired - Lifetime US901659A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US41870408A US901659A (en) 1908-03-02 1908-03-02 Method of making bifocal lenses.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US41870408A US901659A (en) 1908-03-02 1908-03-02 Method of making bifocal lenses.

Publications (1)

Publication Number Publication Date
US901659A true US901659A (en) 1908-10-20

Family

ID=2970083

Family Applications (1)

Application Number Title Priority Date Filing Date
US41870408A Expired - Lifetime US901659A (en) 1908-03-02 1908-03-02 Method of making bifocal lenses.

Country Status (1)

Country Link
US (1) US901659A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4018587A (en) * 1974-03-29 1977-04-19 Essilor International (Compagnie Generale D'optique) Method for producing a curved glass die having an aspherical polished concave face
US4073579A (en) * 1976-06-09 1978-02-14 American Optical Corporation Ophthalmic lens with locally variable index of refraction and method of making same
DE3346785A1 (en) * 1982-12-27 1984-06-28 Canon K.K., Tokio/Tokyo Cemented lens
US4883524A (en) * 1988-07-25 1989-11-28 Bristol Alexander C Invisible flat-top mold blank and method for manufacturing same
US5147437A (en) * 1988-07-25 1992-09-15 Bristol Alexander C Invisible flat-top mold blank and method for manufacturing same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4018587A (en) * 1974-03-29 1977-04-19 Essilor International (Compagnie Generale D'optique) Method for producing a curved glass die having an aspherical polished concave face
US4073579A (en) * 1976-06-09 1978-02-14 American Optical Corporation Ophthalmic lens with locally variable index of refraction and method of making same
DE3346785A1 (en) * 1982-12-27 1984-06-28 Canon K.K., Tokio/Tokyo Cemented lens
US4883524A (en) * 1988-07-25 1989-11-28 Bristol Alexander C Invisible flat-top mold blank and method for manufacturing same
US5147437A (en) * 1988-07-25 1992-09-15 Bristol Alexander C Invisible flat-top mold blank and method for manufacturing same

Similar Documents

Publication Publication Date Title
US4349374A (en) Method and apparatus for manufacturing glass progressive lenses
US901659A (en) Method of making bifocal lenses.
GB1566610A (en) Process for producing sagged class product thereby and support for use therewith
CN207123630U (en) Coupled lens and laser optical system
US1026182A (en) Method of making lens-blanks.
JPS64211B2 (en)
CN207123626U (en) Coupled lens and laser optical system
KR860001357A (en) Manufacturing method of semi-processed contact lens
US861055A (en) Process of forming lenses.
KR20210050327A (en) Apparatus for forming the guide roller
US1024486A (en) Method of making bifocal-lens blanks.
US992463A (en) Process for manufacture of steel rings.
US865363A (en) Method of making bifocal lenses.
US1180383A (en) Method of forming lenses.
JPS61291424A (en) Forming mold of glass lens and forming method
US827500A (en) Method of making bifocal lenses.
JPS5838631A (en) Forging die
JPH0718733Y2 (en) Mold for optical element molding
USRE20929E (en) Lens and method of making same
GB191209402A (en) Improvements in the Method of Making Bifocal Lenses.
US2067194A (en) Lens and method of making same
KR0125997Y1 (en) A mould for lens
JP2520429Y2 (en) Mold for optical element
JPH0517178B2 (en)
JPH02252628A (en) Method for forming optical element